Initial commit

.formatter.exs

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+[
+  import_deps: [:ecto, :phoenix],
+  inputs: ["*.{ex,exs}", "priv/*/seeds.exs", "{config,lib,test}/**/*.{ex,exs}"],
+  subdirectories: ["priv/*/migrations"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where 3rd-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+wiki-*.tar
+
+# If NPM crashes, it generates a log, let's ignore it too.
+npm-debug.log
+
+# The directory NPM downloads your dependencies sources to.
+/assets/node_modules/
+
+# Since we are building assets from assets/,
+# we ignore priv/static. You may want to comment
+# this depending on your deployment strategy.
+/priv/static/

README.md

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+# Wiki
+
+To start your Phoenix server:
+
+  * Install dependencies with `mix deps.get`
+  * Create and migrate your database with `mix ecto.setup`
+  * Install Node.js dependencies with `npm install` inside the `assets` directory
+  * Start Phoenix endpoint with `mix phx.server`
+
+Now you can visit [`localhost:4000`](http://localhost:4000) from your browser.
+
+Ready to run in production? Please [check our deployment guides](https://hexdocs.pm/phoenix/deployment.html).
+
+## Learn more
+
+  * Official website: https://www.phoenixframework.org/
+  * Guides: https://hexdocs.pm/phoenix/overview.html
+  * Docs: https://hexdocs.pm/phoenix
+  * Forum: https://elixirforum.com/c/phoenix-forum
+  * Source: https://github.com/phoenixframework/phoenix

assets/.babelrc

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+{
+    "presets": [
+        "@babel/preset-env"
+    ]
+}

assets/css/app.scss

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+/* This file is for your main application css. */
+@import "./phoenix.css";
+
+/* Alerts and form errors */
+.alert {
+  padding: 15px;
+  margin-bottom: 20px;
+  border: 1px solid transparent;
+  border-radius: 4px;
+}
+.alert-info {
+  color: #31708f;
+  background-color: #d9edf7;
+  border-color: #bce8f1;
+}
+.alert-warning {
+  color: #8a6d3b;
+  background-color: #fcf8e3;
+  border-color: #faebcc;
+}
+.alert-danger {
+  color: #a94442;
+  background-color: #f2dede;
+  border-color: #ebccd1;
+}
+.alert p {
+  margin-bottom: 0;
+}
+.alert:empty {
+  display: none;
+}
+.invalid-feedback {
+  color: #a94442;
+  display: block;
+  margin: -1rem 0 2rem;
+}

assets/js/app.js

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+// We need to import the CSS so that webpack will load it.
+// The MiniCssExtractPlugin is used to separate it out into
+// its own CSS file.
+import "../css/app.scss"
+
+// webpack automatically bundles all modules in your
+// entry points. Those entry points can be configured
+// in "webpack.config.js".
+//
+// Import deps with the dep name or local files with a relative path, for example:
+//
+//     import {Socket} from "phoenix"
+//     import socket from "./socket"
+//
+import "phoenix_html"

assets/js/socket.js

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+// NOTE: The contents of this file will only be executed if
+// you uncomment its entry in "assets/js/app.js".
+
+// To use Phoenix channels, the first step is to import Socket,
+// and connect at the socket path in "lib/web/endpoint.ex".
+//
+// Pass the token on params as below. Or remove it
+// from the params if you are not using authentication.
+import {Socket} from "phoenix"
+
+let socket = new Socket("/socket", {params: {token: window.userToken}})
+
+// When you connect, you'll often need to authenticate the client.
+// For example, imagine you have an authentication plug, `MyAuth`,
+// which authenticates the session and assigns a `:current_user`.
+// If the current user exists you can assign the user's token in
+// the connection for use in the layout.
+//
+// In your "lib/web/router.ex":
+//
+//     pipeline :browser do
+//       ...
+//       plug MyAuth
+//       plug :put_user_token
+//     end
+//
+//     defp put_user_token(conn, _) do
+//       if current_user = conn.assigns[:current_user] do
+//         token = Phoenix.Token.sign(conn, "user socket", current_user.id)
+//         assign(conn, :user_token, token)
+//       else
+//         conn
+//       end
+//     end
+//
+// Now you need to pass this token to JavaScript. You can do so
+// inside a script tag in "lib/web/templates/layout/app.html.eex":
+//
+//     <script>window.userToken = "<%= assigns[:user_token] %>";</script>
+//
+// You will need to verify the user token in the "connect/3" function
+// in "lib/web/channels/user_socket.ex":
+//
+//     def connect(%{"token" => token}, socket, _connect_info) do
+//       # max_age: 1209600 is equivalent to two weeks in seconds
+//       case Phoenix.Token.verify(socket, "user socket", token, max_age: 1209600) do
+//         {:ok, user_id} ->
+//           {:ok, assign(socket, :user, user_id)}
+//         {:error, reason} ->
+//           :error
+//       end
+//     end
+//
+// Finally, connect to the socket:
+socket.connect()
+
+// Now that you are connected, you can join channels with a topic:
+let channel = socket.channel("topic:subtopic", {})
+channel.join()
+  .receive("ok", resp => { console.log("Joined successfully", resp) })
+  .receive("error", resp => { console.log("Unable to join", resp) })
+
+export default socket

assets/package.json

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+{
+  "repository": {},
+  "description": " ",
+  "license": "MIT",
+  "scripts": {
+    "deploy": "webpack --mode production",
+    "watch": "webpack --mode development --watch"
+  },
+  "dependencies": {
+    "phoenix": "file:../deps/phoenix",
+    "phoenix_html": "file:../deps/phoenix_html"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "babel-loader": "^8.0.0",
+    "copy-webpack-plugin": "^5.1.1",
+    "css-loader": "^3.4.2",
+    "sass-loader": "^8.0.2",
+    "node-sass": "^4.13.1",
+    "hard-source-webpack-plugin": "^0.13.1",
+    "mini-css-extract-plugin": "^0.9.0",
+    "optimize-css-assets-webpack-plugin": "^5.0.1",
+    "terser-webpack-plugin": "^2.3.2",
+    "webpack": "4.41.5",
+    "webpack-cli": "^3.3.2"
+  }
+}

assets/static/robots.txt

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+# See http://www.robotstxt.org/robotstxt.html for documentation on how to use the robots.txt file
+#
+# To ban all spiders from the entire site uncomment the next two lines:
+# User-agent: *
+# Disallow: /

assets/webpack.config.js

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+const path = require('path');
+const glob = require('glob');
+const HardSourceWebpackPlugin = require('hard-source-webpack-plugin');
+const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+const TerserPlugin = require('terser-webpack-plugin');
+const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
+const CopyWebpackPlugin = require('copy-webpack-plugin');
+
+module.exports = (env, options) => {
+  const devMode = options.mode !== 'production';
+
+  return {
+    optimization: {
+      minimizer: [
+        new TerserPlugin({ cache: true, parallel: true, sourceMap: devMode }),
+        new OptimizeCSSAssetsPlugin({})
+      ]
+    },
+    entry: {
+      'app': glob.sync('./vendor/**/*.js').concat(['./js/app.js'])
+    },
+    output: {
+      filename: '[name].js',
+      path: path.resolve(__dirname, '../priv/static/js'),
+      publicPath: '/js/'
+    },
+    devtool: devMode ? 'eval-cheap-module-source-map' : undefined,
+    module: {
+      rules: [
+        {
+          test: /\.js$/,
+          exclude: /node_modules/,
+          use: {
+            loader: 'babel-loader'
+          }
+        },
+        {
+          test: /\.[s]?css$/,
+          use: [
+            MiniCssExtractPlugin.loader,
+            'css-loader',
+            'sass-loader',
+          ],
+        }
+      ]
+    },
+    plugins: [
+      new MiniCssExtractPlugin({ filename: '../css/app.css' }),
+      new CopyWebpackPlugin([{ from: 'static/', to: '../' }])
+    ]
+    .concat(devMode ? [new HardSourceWebpackPlugin()] : [])
+  }
+};

config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+#
+# This configuration file is loaded before any dependency and
+# is restricted to this project.
+
+# General application configuration
+use Mix.Config
+
+config :wiki,
+  ecto_repos: [Wiki.Repo]
+
+# Configures the endpoint
+config :wiki, WikiWeb.Endpoint,
+  url: [host: "localhost"],
+  secret_key_base: "NAmmGcVuvhjH1c7Qh1ZSYdVwGuJKzJNBNIV5aOPduk/be7yV3cxjQAJ+ur8kHXTS",
+  render_errors: [view: WikiWeb.ErrorView, accepts: ~w(html json), layout: false],
+  pubsub_server: Wiki.PubSub,
+  live_view: [signing_salt: "GHNEYNHx"]
+
+# Configures Elixir's Logger
+config :logger, :console,
+  format: "$time $metadata[$level] $message\n",
+  metadata: [:request_id]
+
+# Use Jason for JSON parsing in Phoenix
+config :phoenix, :json_library, Jason
+
+# Import environment specific config. This must remain at the bottom
+# of this file so it overrides the configuration defined above.
+import_config "#{Mix.env()}.exs"

config/dev.exs

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+use Mix.Config
+
+# Configure your database
+config :wiki, Wiki.Repo,
+  username: "postgres",
+  password: "postgres",
+  database: "wiki_dev",
+  hostname: "localhost",
+  show_sensitive_data_on_connection_error: true,
+  pool_size: 10
+
+# For development, we disable any cache and enable
+# debugging and code reloading.
+#
+# The watchers configuration can be used to run external
+# watchers to your application. For example, we use it
+# with webpack to recompile .js and .css sources.
+config :wiki, WikiWeb.Endpoint,
+  http: [port: 4000],
+  debug_errors: true,
+  code_reloader: true,
+  check_origin: false,
+  watchers: [
+    node: [
+      "node_modules/webpack/bin/webpack.js",
+      "--mode",
+      "development",
+      "--watch-stdin",
+      cd: Path.expand("../assets", __DIR__)
+    ]
+  ]
+
+# ## SSL Support
+#
+# In order to use HTTPS in development, a self-signed
+# certificate can be generated by running the following
+# Mix task:
+#
+#     mix phx.gen.cert
+#
+# Note that this task requires Erlang/OTP 20 or later.
+# Run `mix help phx.gen.cert` for more information.
+#
+# The `http:` config above can be replaced with:
+#
+#     https: [
+#       port: 4001,
+#       cipher_suite: :strong,
+#       keyfile: "priv/cert/selfsigned_key.pem",
+#       certfile: "priv/cert/selfsigned.pem"
+#     ],
+#
+# If desired, both `http:` and `https:` keys can be
+# configured to run both http and https servers on
+# different ports.
+
+# Watch static and templates for browser reloading.
+config :wiki, WikiWeb.Endpoint,
+  live_reload: [
+    patterns: [
+      ~r"priv/static/.*(js|css|png|jpeg|jpg|gif|svg)$",
+      ~r"priv/gettext/.*(po)$",
+      ~r"lib/wiki_web/(live|views)/.*(ex)$",
+      ~r"lib/wiki_web/templates/.*(eex)$"
+    ]
+  ]
+
+# Do not include metadata nor timestamps in development logs
+config :logger, :console, format: "[$level] $message\n"
+
+# Set a higher stacktrace during development. Avoid configuring such
+# in production as building large stacktraces may be expensive.
+config :phoenix, :stacktrace_depth, 20
+
+# Initialize plugs at runtime for faster development compilation
+config :phoenix, :plug_init_mode, :runtime

config/prod.exs

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+use Mix.Config
+
+# For production, don't forget to configure the url host
+# to something meaningful, Phoenix uses this information
+# when generating URLs.
+#
+# Note we also include the path to a cache manifest
+# containing the digested version of static files. This
+# manifest is generated by the `mix phx.digest` task,
+# which you should run after static files are built and
+# before starting your production server.
+config :wiki, WikiWeb.Endpoint,
+  url: [host: "example.com", port: 80],
+  cache_static_manifest: "priv/static/cache_manifest.json"
+
+# Do not print debug messages in production
+config :logger, level: :info
+
+# ## SSL Support
+#
+# To get SSL working, you will need to add the `https` key
+# to the previous section and set your `:url` port to 443:
+#
+#     config :wiki, WikiWeb.Endpoint,
+#       ...
+#       url: [host: "example.com", port: 443],
+#       https: [
+#         port: 443,
+#         cipher_suite: :strong,
+#         keyfile: System.get_env("SOME_APP_SSL_KEY_PATH"),
+#         certfile: System.get_env("SOME_APP_SSL_CERT_PATH"),
+#         transport_options: [socket_opts: [:inet6]]
+#       ]
+#
+# The `cipher_suite` is set to `:strong` to support only the
+# latest and more secure SSL ciphers. This means old browsers
+# and clients may not be supported. You can set it to
+# `:compatible` for wider support.
+#
+# `:keyfile` and `:certfile` expect an absolute path to the key
+# and cert in disk or a relative path inside priv, for example
+# "priv/ssl/server.key". For all supported SSL configuration
+# options, see https://hexdocs.pm/plug/Plug.SSL.html#configure/1
+#
+# We also recommend setting `force_ssl` in your endpoint, ensuring
+# no data is ever sent via http, always redirecting to https:
+#
+#     config :wiki, WikiWeb.Endpoint,
+#       force_ssl: [hsts: true]
+#
+# Check `Plug.SSL` for all available options in `force_ssl`.
+
+# Finally import the config/prod.secret.exs which loads secrets
+# and configuration from environment variables.
+import_config "prod.secret.exs"

config/prod.secret.exs

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+# In this file, we load production configuration and secrets
+# from environment variables. You can also hardcode secrets,
+# although such is generally not recommended and you have to
+# remember to add this file to your .gitignore.
+use Mix.Config
+
+database_url =
+  System.get_env("DATABASE_URL") ||
+    raise """
+    environment variable DATABASE_URL is missing.
+    For example: ecto://USER:PASS@HOST/DATABASE
+    """
+
+config :wiki, Wiki.Repo,
+  # ssl: true,
+  url: database_url,
+  pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")
+
+secret_key_base =
+  System.get_env("SECRET_KEY_BASE") ||
+    raise """
+    environment variable SECRET_KEY_BASE is missing.
+    You can generate one by calling: mix phx.gen.secret
+    """
+
+config :wiki, WikiWeb.Endpoint,
+  http: [
+    port: String.to_integer(System.get_env("PORT") || "4000"),
+    transport_options: [socket_opts: [:inet6]]
+  ],
+  secret_key_base: secret_key_base
+
+# ## Using releases (Elixir v1.9+)
+#
+# If you are doing OTP releases, you need to instruct Phoenix
+# to start each relevant endpoint:
+#
+#     config :wiki, WikiWeb.Endpoint, server: true
+#
+# Then you can assemble a release by calling `mix release`.
+# See `mix help release` for more information.

config/test.exs

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+use Mix.Config
+
+# Only in tests, remove the complexity from the password hashing algorithm
+config :bcrypt_elixir, :log_rounds, 1
+
+# Configure your database
+#
+# The MIX_TEST_PARTITION environment variable can be used
+# to provide built-in test partitioning in CI environment.
+# Run `mix help test` for more information.
+config :wiki, Wiki.Repo,
+  username: "postgres",
+  password: "postgres",
+  database: "wiki_test#{System.get_env("MIX_TEST_PARTITION")}",
+  hostname: "localhost",
+  pool: Ecto.Adapters.SQL.Sandbox
+
+# We don't run a server during test. If one is required,
+# you can enable the server option below.
+config :wiki, WikiWeb.Endpoint,
+  http: [port: 4002],
+  server: false
+
+# Print only warnings and errors during test
+config :logger, level: :warn

lib/wiki.ex

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+defmodule Wiki do
+  @moduledoc """
+  Wiki keeps the contexts that define your domain
+  and business logic.
+
+  Contexts are also responsible for managing your data, regardless
+  if it comes from the database, an external API or others.
+  """
+end

lib/wiki/accounts.ex

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+defmodule Wiki.Accounts do
+  @moduledoc """
+  The Accounts context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Wiki.Repo
+  alias Wiki.Accounts.{User, UserToken, UserNotifier}
+
+  ## Database getters
+
+  @doc """
+  Gets a user by email.
+
+  ## Examples
+
+      iex> get_user_by_email("foo@example.com")
+      %User{}
+
+      iex> get_user_by_email("unknown@example.com")
+      nil
+
+  """
+  def get_user_by_email(email) when is_binary(email) do
+    Repo.get_by(User, email: email)
+  end
+
+  @doc """
+  Gets a user by email and password.
+
+  ## Examples
+
+      iex> get_user_by_email_and_password("foo@example.com", "correct_password")
+      %User{}
+
+      iex> get_user_by_email_and_password("foo@example.com", "invalid_password")
+      nil
+
+  """
+  def get_user_by_email_and_password(email, password)
+      when is_binary(email) and is_binary(password) do
+    user = Repo.get_by(User, email: email)
+    if User.valid_password?(user, password), do: user
+  end
+
+  @doc """
+  Gets a single user.
+
+  Raises `Ecto.NoResultsError` if the User does not exist.
+
+  ## Examples
+
+      iex> get_user!(123)
+      %User{}
+
+      iex> get_user!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_user!(id), do: Repo.get!(User, id)
+
+  ## User registration
+
+  @doc """
+  Registers a user.
+
+  ## Examples
+
+      iex> register_user(%{field: value})
+      {:ok, %User{}}
+
+      iex> register_user(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def register_user(attrs) do
+    attrs = Map.put(attrs, "content_encryption_key_salt", Argon2.gen_salt())
+
+    %User{}
+    |> User.registration_changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking user changes.
+
+  ## Examples
+
+      iex> change_user_registration(user)
+      %Ecto.Changeset{data: %User{}}
+
+  """
+  def change_user_registration(%User{} = user, attrs \\ %{}) do
+    User.registration_changeset(user, attrs)
+  end
+
+  ## Settings
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for changing the user e-mail.
+
+  ## Examples
+
+      iex> change_user_email(user)
+      %Ecto.Changeset{data: %User{}}
+
+  """
+  def change_user_email(user, attrs \\ %{}) do
+    User.email_changeset(user, attrs)
+  end
+
+  @doc """
+  Emulates that the e-mail will change without actually changing
+  it in the database.
+
+  ## Examples
+
+      iex> apply_user_email(user, "valid password", %{email: ...})
+      {:ok, %User{}}
+
+      iex> apply_user_email(user, "invalid password", %{email: ...})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def apply_user_email(user, password, attrs) do
+    user
+    |> User.email_changeset(attrs)
+    |> User.validate_current_password(password)
+    |> Ecto.Changeset.apply_action(:update)
+  end
+
+  @doc """
+  Updates the user e-mail in token.
+
+  If the token matches, the user email is updated and the token is deleted.
+  The confirmed_at date is also updated to the current time.
+  """
+  def update_user_email(user, token) do
+    context = "change:#{user.email}"
+
+    with {:ok, query} <- UserToken.verify_change_email_token_query(token, context),
+         %UserToken{sent_to: email} <- Repo.one(query),
+         {:ok, _} <- Repo.transaction(user_email_multi(user, email, context)) do
+      :ok
+    else
+      _ -> :error
+    end
+  end
+
+  defp user_email_multi(user, email, context) do
+    changeset = user |> User.email_changeset(%{email: email}) |> User.confirm_changeset()
+
+    Ecto.Multi.new()
+    |> Ecto.Multi.update(:user, changeset)
+    |> Ecto.Multi.delete_all(:tokens, UserToken.user_and_contexts_query(user, [context]))
+  end
+
+  @doc """
+  Delivers the update e-mail instructions to the given user.
+
+  ## Examples
+
+      iex> deliver_update_email_instructions(user, current_email, &Routes.user_update_email_url(conn, :edit, &1))
+      {:ok, %{to: ..., body: ...}}
+
+  """
+  def deliver_update_email_instructions(%User{} = user, current_email, update_email_url_fun)
+      when is_function(update_email_url_fun, 1) do
+    {encoded_token, user_token} = UserToken.build_email_token(user, "change:#{current_email}")
+
+    Repo.insert!(user_token)
+    UserNotifier.deliver_update_email_instructions(user, update_email_url_fun.(encoded_token))
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for changing the user password.
+
+  ## Examples
+
+      iex> change_user_password(user)
+      %Ecto.Changeset{data: %User{}}
+
+  """
+  def change_user_password(user, attrs \\ %{}) do
+    User.password_changeset(user, attrs)
+  end
+
+  @doc """
+  Updates the user password.
+
+  ## Examples
+
+      iex> update_user_password(user, "valid password", %{password: ...})
+      {:ok, %User{}}
+
+      iex> update_user_password(user, "invalid password", %{password: ...})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_user_password(user, password, attrs) do
+    changeset =
+      user
+      |> User.password_changeset(attrs)
+      |> User.validate_current_password(password)
+
+    Ecto.Multi.new()
+    |> Ecto.Multi.update(:user, changeset)
+    |> Ecto.Multi.delete_all(:tokens, UserToken.user_and_contexts_query(user, :all))
+    |> Repo.transaction()
+    |> case do
+      {:ok, %{user: user}} -> {:ok, user}
+      {:error, :user, changeset, _} -> {:error, changeset}
+    end
+  end
+
+  ## Session
+
+  @doc """
+  Generates a session token.
+  """
+  def generate_user_session_token(user) do
+    {token, user_token} = UserToken.build_session_token(user)
+    Repo.insert!(user_token)
+    token
+  end
+
+  @doc """
+  Gets the user with the given signed token.
+  """
+  def get_user_by_session_token(token) do
+    {:ok, query} = UserToken.verify_session_token_query(token)
+    Repo.one(query)
+  end
+
+  @doc """
+  Deletes the signed token with the given context.
+  """
+  def delete_session_token(token) do
+    Repo.delete_all(UserToken.token_and_context_query(token, "session"))
+    :ok
+  end
+
+  ## Confirmation
+
+  @doc """
+  Delivers the confirmation e-mail instructions to the given user.
+
+  ## Examples
+
+      iex> deliver_user_confirmation_instructions(user, &Routes.user_confirmation_url(conn, :confirm, &1))
+      {:ok, %{to: ..., body: ...}}
+
+      iex> deliver_user_confirmation_instructions(confirmed_user, &Routes.user_confirmation_url(conn, :confirm, &1))
+      {:error, :already_confirmed}
+
+  """
+  def deliver_user_confirmation_instructions(%User{} = user, confirmation_url_fun)
+      when is_function(confirmation_url_fun, 1) do
+    if user.confirmed_at do
+      {:error, :already_confirmed}
+    else
+      {encoded_token, user_token} = UserToken.build_email_token(user, "confirm")
+      Repo.insert!(user_token)
+      UserNotifier.deliver_confirmation_instructions(user, confirmation_url_fun.(encoded_token))
+    end
+  end
+
+  @doc """
+  Confirms a user by the given token.
+
+  If the token matches, the user account is marked as confirmed
+  and the token is deleted.
+  """
+  def confirm_user(token) do
+    with {:ok, query} <- UserToken.verify_email_token_query(token, "confirm"),
+         %User{} = user <- Repo.one(query),
+         {:ok, %{user: user}} <- Repo.transaction(confirm_user_multi(user)) do
+      {:ok, user}
+    else
+      _ -> :error
+    end
+  end
+
+  defp confirm_user_multi(user) do
+    Ecto.Multi.new()
+    |> Ecto.Multi.update(:user, User.confirm_changeset(user))
+    |> Ecto.Multi.delete_all(:tokens, UserToken.user_and_contexts_query(user, ["confirm"]))
+  end
+
+  ## Reset password
+
+  @doc """
+  Delivers the reset password e-mail to the given user.
+
+  ## Examples
+
+      iex> deliver_user_reset_password_instructions(user, &Routes.user_reset_password_url(conn, :edit, &1))
+      {:ok, %{to: ..., body: ...}}
+
+  """
+  def deliver_user_reset_password_instructions(%User{} = user, reset_password_url_fun)
+      when is_function(reset_password_url_fun, 1) do
+    {encoded_token, user_token} = UserToken.build_email_token(user, "reset_password")
+    Repo.insert!(user_token)
+    UserNotifier.deliver_reset_password_instructions(user, reset_password_url_fun.(encoded_token))
+  end
+
+  @doc """
+  Gets the user by reset password token.
+
+  ## Examples
+
+      iex> get_user_by_reset_password_token("validtoken")
+      %User{}
+
+      iex> get_user_by_reset_password_token("invalidtoken")
+      nil
+
+  """
+  def get_user_by_reset_password_token(token) do
+    with {:ok, query} <- UserToken.verify_email_token_query(token, "reset_password"),
+         %User{} = user <- Repo.one(query) do
+      user
+    else
+      _ -> nil
+    end
+  end
+
+  @doc """
+  Resets the user password.
+
+  ## Examples
+
+      iex> reset_user_password(user, %{password: "new long password", password_confirmation: "new long password"})
+      {:ok, %User{}}
+
+      iex> reset_user_password(user, %{password: "valid", password_confirmation: "not the same"})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def reset_user_password(user, attrs) do
+    Ecto.Multi.new()
+    |> Ecto.Multi.update(:user, User.password_changeset(user, attrs))
+    |> Ecto.Multi.delete_all(:tokens, UserToken.user_and_contexts_query(user, :all))
+    |> Repo.transaction()
+    |> case do
+      {:ok, %{user: user}} -> {:ok, user}
+      {:error, :user, changeset, _} -> {:error, changeset}
+    end
+  end
+
+  def generate_content_encryption_key(%User{content_encryption_key_salt: salt}, %{
+        "password" => password
+      }) do
+    IO.puts("password: #{inspect(password)}")
+
+    Argon2.Base.hash_password(password, salt, format: :raw_hash, hashlen: 32)
+    |> IO.inspect()
+  end
+
+  def generate_content_encryption_key(_user, _params) do
+    nil
+  end
+end

lib/wiki/accounts/user.ex

@@ -0,0 +1,117 @@
+defmodule Wiki.Accounts.User do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @derive {Inspect, except: [:password]}
+  schema "users" do
+    field :email, :string
+    field :password, :string, virtual: true
+    field :hashed_password, :string
+    field :confirmed_at, :naive_datetime
+    field :content_encryption_key_salt, :binary
+
+    timestamps()
+  end
+
+  @doc """
+  A user changeset for registration.
+
+  It is important to validate the length of both e-mail and password.
+  Otherwise databases may truncate the e-mail without warnings, which
+  could lead to unpredictable or insecure behaviour. Long passwords may
+  also be very expensive to hash for certain algorithms.
+  """
+  def registration_changeset(user, attrs) do
+    user
+    |> cast(attrs, [:email, :password, :content_encryption_key_salt])
+    |> validate_email()
+    |> validate_password()
+  end
+
+  defp validate_email(changeset) do
+    changeset
+    |> validate_required([:email])
+    |> validate_format(:email, ~r/^[^\s]+@[^\s]+$/, message: "must have the @ sign and no spaces")
+    |> validate_length(:email, max: 160)
+    |> unsafe_validate_unique(:email, Wiki.Repo)
+    |> unique_constraint(:email)
+  end
+
+  defp validate_password(changeset) do
+    changeset
+    |> validate_required([:password])
+    |> validate_length(:password, min: 8, max: 80)
+    # |> validate_format(:password, ~r/[a-z]/, message: "at least one lower case character")
+    # |> validate_format(:password, ~r/[A-Z]/, message: "at least one upper case character")
+    # |> validate_format(:password, ~r/[!?@#$%^&*_0-9]/, message: "at least one digit or punctuation character")
+    |> prepare_changes(&hash_password/1)
+  end
+
+  defp hash_password(changeset) do
+    password = get_change(changeset, :password)
+
+    changeset
+    |> put_change(:hashed_password, Argon2.hash_pwd_salt(password))
+    |> delete_change(:password)
+  end
+
+  @doc """
+  A user changeset for changing the e-mail.
+
+  It requires the e-mail to change otherwise an error is added.
+  """
+  def email_changeset(user, attrs) do
+    user
+    |> cast(attrs, [:email])
+    |> validate_email()
+    |> case do
+      %{changes: %{email: _}} = changeset -> changeset
+      %{} = changeset -> add_error(changeset, :email, "did not change")
+    end
+  end
+
+  @doc """
+  A user changeset for changing the password.
+  """
+  def password_changeset(user, attrs) do
+    user
+    |> cast(attrs, [:password])
+    |> validate_confirmation(:password, message: "does not match password")
+    |> validate_password()
+  end
+
+  @doc """
+  Confirms the account by setting `confirmed_at`.
+  """
+  def confirm_changeset(user) do
+    now = NaiveDateTime.utc_now() |> NaiveDateTime.truncate(:second)
+    change(user, confirmed_at: now)
+  end
+
+  @doc """
+  Verifies the password.
+
+  If there is no user or the user doesn't have a password, we call
+  `Bcrypt.no_user_verify/0` to avoid timing attacks.
+  """
+  def valid_password?(%Wiki.Accounts.User{hashed_password: hashed_password}, password)
+      when is_binary(hashed_password) and byte_size(password) > 0 do
+    Argon2.verify_pass(password, hashed_password)
+  end
+
+  def valid_password?(_, _) do
+    Argon2.no_user_verify()
+    false
+  end
+
+  @doc """
+  Validates the current password otherwise adds an error to the changeset.
+  """
+  def validate_current_password(changeset, password) do
+    if valid_password?(changeset.data, password) do
+      changeset
+    else
+      add_error(changeset, :current_password, "is not valid")
+    end
+  end
+end

lib/wiki/accounts/user_notifier.ex

@@ -0,0 +1,73 @@
+defmodule Wiki.Accounts.UserNotifier do
+  # For simplicity, this module simply logs messages to the terminal.
+  # You should replace it by a proper e-mail or notification tool, such as:
+  #
+  #   * Swoosh - https://hexdocs.pm/swoosh
+  #   * Bamboo - https://hexdocs.pm/bamboo
+  #
+  defp deliver(to, body) do
+    require Logger
+    Logger.debug(body)
+    {:ok, %{to: to, body: body}}
+  end
+
+  @doc """
+  Deliver instructions to confirm account.
+  """
+  def deliver_confirmation_instructions(user, url) do
+    deliver(user.email, """
+
+    ==============================
+
+    Hi #{user.email},
+
+    You can confirm your account by visiting the url below:
+
+    #{url}
+
+    If you didn't create an account with us, please ignore this.
+
+    ==============================
+    """)
+  end
+
+  @doc """
+  Deliver instructions to reset password account.
+  """
+  def deliver_reset_password_instructions(user, url) do
+    deliver(user.email, """
+
+    ==============================
+
+    Hi #{user.email},
+
+    You can reset your password by visiting the url below:
+
+    #{url}
+
+    If you didn't request this change, please ignore this.
+
+    ==============================
+    """)
+  end
+
+  @doc """
+  Deliver instructions to update your e-mail.
+  """
+  def deliver_update_email_instructions(user, url) do
+    deliver(user.email, """
+
+    ==============================
+
+    Hi #{user.email},
+
+    You can change your e-mail by visiting the url below:
+
+    #{url}
+
+    If you didn't request this change, please ignore this.
+
+    ==============================
+    """)
+  end
+end

lib/wiki/accounts/user_token.ex

@@ -0,0 +1,139 @@
+defmodule Wiki.Accounts.UserToken do
+  use Ecto.Schema
+  import Ecto.Query
+
+  @hash_algorithm :sha256
+  @rand_size 32
+
+  # It is very important to keep the reset password token expiry short,
+  # since someone with access to the e-mail may take over the account.
+  @reset_password_validity_in_days 1
+  @confirm_validity_in_days 7
+  @change_email_validity_in_days 7
+  @session_validity_in_days 60
+
+  schema "users_tokens" do
+    field :token, :binary
+    field :context, :string
+    field :sent_to, :string
+    belongs_to :user, Wiki.Accounts.User
+
+    timestamps(updated_at: false)
+  end
+
+  @doc """
+  Generates a token that will be stored in a signed place,
+  such as session or cookie. As they are signed, those
+  tokens do not need to be hashed.
+  """
+  def build_session_token(user) do
+    token = :crypto.strong_rand_bytes(@rand_size)
+    {token, %Wiki.Accounts.UserToken{token: token, context: "session", user_id: user.id}}
+  end
+
+  @doc """
+  Checks if the token is valid and returns its underlying lookup query.
+
+  The query returns the user found by the token.
+  """
+  def verify_session_token_query(token) do
+    query =
+      from token in token_and_context_query(token, "session"),
+        join: user in assoc(token, :user),
+        where: token.inserted_at > ago(@session_validity_in_days, "day"),
+        select: user
+
+    {:ok, query}
+  end
+
+  @doc """
+  Builds a token with a hashed counter part.
+
+  The non-hashed token is sent to the user e-mail while the
+  hashed part is stored in the database, to avoid reconstruction.
+  The token is valid for a week as long as users don't change
+  their email.
+  """
+  def build_email_token(user, context) do
+    build_hashed_token(user, context, user.email)
+  end
+
+  defp build_hashed_token(user, context, sent_to) do
+    token = :crypto.strong_rand_bytes(@rand_size)
+    hashed_token = :crypto.hash(@hash_algorithm, token)
+
+    {Base.url_encode64(token, padding: false),
+     %Wiki.Accounts.UserToken{
+       token: hashed_token,
+       context: context,
+       sent_to: sent_to,
+       user_id: user.id
+     }}
+  end
+
+  @doc """
+  Checks if the token is valid and returns its underlying lookup query.
+
+  The query returns the user found by the token.
+  """
+  def verify_email_token_query(token, context) do
+    case Base.url_decode64(token, padding: false) do
+      {:ok, decoded_token} ->
+        hashed_token = :crypto.hash(@hash_algorithm, decoded_token)
+        days = days_for_context(context)
+
+        query =
+          from token in token_and_context_query(hashed_token, context),
+            join: user in assoc(token, :user),
+            where: token.inserted_at > ago(^days, "day") and token.sent_to == user.email,
+            select: user
+
+        {:ok, query}
+
+      :error ->
+        :error
+    end
+  end
+
+  defp days_for_context("confirm"), do: @confirm_validity_in_days
+  defp days_for_context("reset_password"), do: @reset_password_validity_in_days
+
+  @doc """
+  Checks if the token is valid and returns its underlying lookup query.
+
+  The query returns the user token record.
+  """
+  def verify_change_email_token_query(token, context) do
+    case Base.url_decode64(token, padding: false) do
+      {:ok, decoded_token} ->
+        hashed_token = :crypto.hash(@hash_algorithm, decoded_token)
+
+        query =
+          from token in token_and_context_query(hashed_token, context),
+            where: token.inserted_at > ago(@change_email_validity_in_days, "day")
+
+        {:ok, query}
+
+      :error ->
+        :error
+    end
+  end
+
+  @doc """
+  Returns the given token with the given context.
+  """
+  def token_and_context_query(token, context) do
+    from Wiki.Accounts.UserToken, where: [token: ^token, context: ^context]
+  end
+
+  @doc """
+  Gets all tokens for the given user for the given contexts.
+  """
+  def user_and_contexts_query(user, :all) do
+    from t in Wiki.Accounts.UserToken, where: t.user_id == ^user.id
+  end
+
+  def user_and_contexts_query(user, [_ | _] = contexts) do
+    from t in Wiki.Accounts.UserToken, where: t.user_id == ^user.id and t.context in ^contexts
+  end
+end

lib/wiki/application.ex

@@ -0,0 +1,34 @@
+defmodule Wiki.Application do
+  # See https://hexdocs.pm/elixir/Application.html
+  # for more information on OTP Applications
+  @moduledoc false
+
+  use Application
+
+  def start(_type, _args) do
+    children = [
+      # Start the Ecto repository
+      Wiki.Repo,
+      # Start the Telemetry supervisor
+      WikiWeb.Telemetry,
+      # Start the PubSub system
+      {Phoenix.PubSub, name: Wiki.PubSub},
+      # Start the Endpoint (http/https)
+      WikiWeb.Endpoint
+      # Start a worker by calling: Wiki.Worker.start_link(arg)
+      # {Wiki.Worker, arg}
+    ]
+
+    # See https://hexdocs.pm/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: Wiki.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+
+  # Tell Phoenix to update the endpoint configuration
+  # whenever the application is updated.
+  def config_change(changed, _new, removed) do
+    WikiWeb.Endpoint.config_change(changed, removed)
+    :ok
+  end
+end

lib/wiki/content.ex

@@ -0,0 +1,106 @@
+defmodule Wiki.Content do
+  @moduledoc """
+  The Content context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Wiki.Repo
+
+  alias Wiki.Content.Page
+
+  @doc """
+  Returns the list of pages.
+
+  ## Examples
+
+      iex> list_pages()
+      [%Page{}, ...]
+
+  """
+  def list_pages do
+    Repo.all(Page)
+  end
+
+  @doc """
+  Gets a single page.
+
+  Raises `Ecto.NoResultsError` if the Page does not exist.
+
+  ## Examples
+
+      iex> get_page!(123)
+      %Page{}
+
+      iex> get_page!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_page!(id), do: Repo.get!(Page, id)
+
+  def get_page(id), do: Repo.get(Page, id)
+
+  @doc """
+  Creates a page.
+
+  ## Examples
+
+      iex> create_page(%{field: value})
+      {:ok, %Page{}}
+
+      iex> create_page(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_page(attrs \\ %{}) do
+    %Page{}
+    |> Page.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a page.
+
+  ## Examples
+
+      iex> update_page(page, %{field: new_value})
+      {:ok, %Page{}}
+
+      iex> update_page(page, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_page(%Page{} = page, attrs) do
+    page
+    |> Page.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a page.
+
+  ## Examples
+
+      iex> delete_page(page)
+      {:ok, %Page{}}
+
+      iex> delete_page(page)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_page(%Page{} = page) do
+    Repo.delete(page)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking page changes.
+
+  ## Examples
+
+      iex> change_page(page)
+      %Ecto.Changeset{data: %Page{}}
+
+  """
+  def change_page(%Page{} = page, attrs \\ %{}) do
+    Page.changeset(page, attrs)
+  end
+end

lib/wiki/content/page.ex

@@ -0,0 +1,82 @@
+defmodule Wiki.Content.Page do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  schema "pages" do
+    field :encrypted_content, :binary
+    field :encrypted_content_iv, :binary
+    field :encrypted_content_tag, :binary
+    field :content, :string, virtual: true
+    field :content_encryption_key, :string, virtual: true
+    field :title, :string
+
+    belongs_to :user, Wiki.Accounts.User
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(page, attrs) do
+    page
+    |> cast(attrs, [
+      :title,
+      :content,
+      :content_encryption_key,
+      :user_id
+    ])
+    |> encrypt_changeset()
+    |> validate_required([
+      :title,
+      :encrypted_content,
+      :user_id
+    ])
+  end
+
+  defp encrypt_changeset(%Ecto.Changeset{changes: %{content: _}} = changeset) do
+    content = get_change(changeset, :content)
+    key = get_field(changeset, :content_encryption_key)
+    {encrypted_content, tag, iv} = do_encrypt(content, key)
+
+    changeset
+    |> put_change(:encrypted_content, encrypted_content)
+    |> put_change(:encrypted_content_tag, tag)
+    |> put_change(:encrypted_content_iv, iv)
+    |> delete_change(:content)
+    |> delete_change(:content_encryption_key)
+  end
+
+  defp encrypt_changeset(changeset), do: changeset
+
+  @iv_size 16
+
+  defp do_encrypt(text, key) do
+    # key is a base16 encoded string (comes from Argon2.Base.hash_password w/ the format: :raw_hash option)
+    key = Base.decode16!(key, case: :lower)
+    iv = :crypto.strong_rand_bytes(@iv_size)
+
+    {encrypted_text, tag} =
+      :crypto.crypto_one_time_aead(:aes_256_gcm, key, iv, text, <<>>, true)
+      |> IO.inspect()
+
+    {encrypted_text, tag, iv}
+  end
+
+  def decrypt_content(page) do
+    key = Base.decode16!(page.content_encryption_key, case: :lower)
+    iv = page.encrypted_content_iv
+    tag = page.encrypted_content_tag
+
+    content =
+      :crypto.crypto_one_time_aead(
+        :aes_256_gcm,
+        key,
+        iv,
+        page.encrypted_content,
+        <<>>,
+        tag,
+        false
+      )
+
+    %__MODULE__{page | content: content}
+  end
+end

lib/wiki/repo.ex

@@ -0,0 +1,5 @@
+defmodule Wiki.Repo do
+  use Ecto.Repo,
+    otp_app: :wiki,
+    adapter: Ecto.Adapters.Postgres
+end

lib/wiki_web.ex

@@ -0,0 +1,81 @@
+defmodule WikiWeb do
+  @moduledoc """
+  The entrypoint for defining your web interface, such
+  as controllers, views, channels and so on.
+
+  This can be used in your application as:
+
+      use WikiWeb, :controller
+      use WikiWeb, :view
+
+  The definitions below will be executed for every view,
+  controller, etc, so keep them short and clean, focused
+  on imports, uses and aliases.
+
+  Do NOT define functions inside the quoted expressions
+  below. Instead, define any helper function in modules
+  and import those modules here.
+  """
+
+  def controller do
+    quote do
+      use Phoenix.Controller, namespace: WikiWeb
+
+      import Plug.Conn
+      import WikiWeb.Gettext
+      alias WikiWeb.Router.Helpers, as: Routes
+    end
+  end
+
+  def view do
+    quote do
+      use Phoenix.View,
+        root: "lib/wiki_web/templates",
+        namespace: WikiWeb
+
+      # Import convenience functions from controllers
+      import Phoenix.Controller,
+        only: [get_flash: 1, get_flash: 2, view_module: 1, view_template: 1]
+
+      # Include shared imports and aliases for views
+      unquote(view_helpers())
+    end
+  end
+
+  def router do
+    quote do
+      use Phoenix.Router
+
+      import Plug.Conn
+      import Phoenix.Controller
+    end
+  end
+
+  def channel do
+    quote do
+      use Phoenix.Channel
+      import WikiWeb.Gettext
+    end
+  end
+
+  defp view_helpers do
+    quote do
+      # Use all HTML functionality (forms, tags, etc)
+      use Phoenix.HTML
+
+      # Import basic rendering functionality (render, render_layout, etc)
+      import Phoenix.View
+
+      import WikiWeb.ErrorHelpers
+      import WikiWeb.Gettext
+      alias WikiWeb.Router.Helpers, as: Routes
+    end
+  end
+
+  @doc """
+  When used, dispatch to the appropriate controller/view/etc.
+  """
+  defmacro __using__(which) when is_atom(which) do
+    apply(__MODULE__, which, [])
+  end
+end

lib/wiki_web/channels/user_socket.ex

@@ -0,0 +1,35 @@
+defmodule WikiWeb.UserSocket do
+  use Phoenix.Socket
+
+  ## Channels
+  # channel "room:*", WikiWeb.RoomChannel
+
+  # Socket params are passed from the client and can
+  # be used to verify and authenticate a user. After
+  # verification, you can put default assigns into
+  # the socket that will be set for all channels, ie
+  #
+  #     {:ok, assign(socket, :user_id, verified_user_id)}
+  #
+  # To deny connection, return `:error`.
+  #
+  # See `Phoenix.Token` documentation for examples in
+  # performing token verification on connect.
+  @impl true
+  def connect(_params, socket, _connect_info) do
+    {:ok, socket}
+  end
+
+  # Socket id's are topics that allow you to identify all sockets for a given user:
+  #
+  #     def id(socket), do: "user_socket:#{socket.assigns.user_id}"
+  #
+  # Would allow you to broadcast a "disconnect" event and terminate
+  # all active sockets and channels for a given user:
+  #
+  #     WikiWeb.Endpoint.broadcast("user_socket:#{user.id}", "disconnect", %{})
+  #
+  # Returning `nil` makes this socket anonymous.
+  @impl true
+  def id(_socket), do: nil
+end

lib/wiki_web/controllers/page_controller.ex

@@ -0,0 +1,93 @@
+defmodule WikiWeb.PageController do
+  use WikiWeb, :controller
+
+  alias Wiki.Content
+  alias Wiki.Content.Page
+
+  plug :get_page when action in [:show, :edit, :update, :delete]
+
+  defp get_page(%Plug.Conn{path_params: %{"id" => id}} = conn, _opts) do
+    case Content.get_page(id) do
+      nil ->
+        conn
+        |> send_resp(404, "Not found")
+        |> halt()
+
+      page ->
+        key = get_session(conn, :content_encryption_key)
+
+        page = %Page{page | content_encryption_key: key}
+
+        page =
+          if action_name(conn) in [:show, :edit] do
+            Page.decrypt_content(page)
+          else
+            page
+          end
+
+        assign(conn, :page, page)
+    end
+  end
+
+  def index(conn, _params) do
+    pages = Content.list_pages()
+    render(conn, "index.html", pages: pages)
+  end
+
+  def new(conn, _params) do
+    changeset = Content.change_page(%Page{})
+    render(conn, "new.html", changeset: changeset)
+  end
+
+  def create(conn, %{"page" => page_params}) do
+    key = get_session(conn, :content_encryption_key)
+
+    page_params =
+      page_params
+      |> Map.put("user_id", conn.assigns.current_user.id)
+      |> Map.put("content_encryption_key", key)
+
+    case Content.create_page(page_params) do
+      {:ok, page} ->
+        conn
+        |> put_flash(:info, "Page created successfully.")
+        |> redirect(to: Routes.page_path(conn, :show, page))
+
+      {:error, %Ecto.Changeset{} = changeset} ->
+        render(conn, "new.html", changeset: changeset)
+    end
+  end
+
+  def show(conn, _params) do
+    render(conn, "show.html", page: conn.assigns.page)
+  end
+
+  def edit(conn, _params) do
+    page = conn.assigns.page
+    changeset = Content.change_page(page)
+    render(conn, "edit.html", page: page, changeset: changeset)
+  end
+
+  def update(conn, %{"page" => page_params}) do
+    page = conn.assigns.page
+
+    case Content.update_page(page, page_params) do
+      {:ok, page} ->
+        conn
+        |> put_flash(:info, "Page updated successfully.")
+        |> redirect(to: Routes.page_path(conn, :show, page))
+
+      {:error, %Ecto.Changeset{} = changeset} ->
+        render(conn, "edit.html", page: page, changeset: changeset)
+    end
+  end
+
+  def delete(conn, _params) do
+    page = conn.assigns.page
+    {:ok, _page} = Content.delete_page(page)
+
+    conn
+    |> put_flash(:info, "Page deleted successfully.")
+    |> redirect(to: Routes.page_path(conn, :index))
+  end
+end

lib/wiki_web/controllers/user_auth.ex

@@ -0,0 +1,153 @@
+defmodule WikiWeb.UserAuth do
+  import Plug.Conn
+  import Phoenix.Controller
+
+  alias Wiki.Accounts
+  alias WikiWeb.Router.Helpers, as: Routes
+
+  # Make the remember me cookie valid for 60 days.
+  # If you want bump or reduce this value, also change
+  # the token expiry itself in UserToken.
+  @max_age 60 * 60 * 24 * 60
+  @remember_me_cookie "user_remember_me"
+  @remember_me_options [sign: true, max_age: @max_age]
+
+  @doc """
+  Logs the user in.
+
+  It renews the session ID and clears the whole session
+  to avoid fixation attacks. See the renew_session
+  function to customize this behaviour.
+
+  It also sets a `:live_socket_id` key in the session,
+  so LiveView sessions are identified and automatically
+  disconnected on log out. The line can be safely removed
+  if you are not using LiveView.
+  """
+  def log_in_user(conn, user, params \\ %{}) do
+    token = Accounts.generate_user_session_token(user)
+    user_return_to = get_session(conn, :user_return_to)
+
+    conn
+    |> renew_session()
+    |> put_session(:user_token, token)
+    |> put_session(:live_socket_id, "users_sessions:#{Base.url_encode64(token)}")
+    |> put_session(
+      :content_encryption_key,
+      Accounts.generate_content_encryption_key(user, params)
+    )
+    |> maybe_write_remember_me_cookie(token, params)
+    |> redirect(to: user_return_to || signed_in_path(conn))
+  end
+
+  defp maybe_write_remember_me_cookie(conn, token, %{"remember_me" => "true"}) do
+    put_resp_cookie(conn, @remember_me_cookie, token, @remember_me_options)
+  end
+
+  defp maybe_write_remember_me_cookie(conn, _token, _params) do
+    conn
+  end
+
+  # This function renews the session ID and erases the whole
+  # session to avoid fixation attacks. If there is any data
+  # in the session you may want to preserve after log in/log out,
+  # you must explicitly fetch the session data before clearing
+  # and then immediately set it after clearing, for example:
+  #
+  #     defp renew_session(conn) do
+  #       preferred_locale = get_session(conn, :preferred_locale)
+  #
+  #       conn
+  #       |> configure_session(renew: true)
+  #       |> clear_session()
+  #       |> put_session(:preferred_locale, preferred_locale)
+  #     end
+  #
+  defp renew_session(conn) do
+    conn
+    |> configure_session(renew: true)
+    |> clear_session()
+  end
+
+  @doc """
+  Logs the user out.
+
+  It clears all session data for safety. See renew_session.
+  """
+  def log_out_user(conn) do
+    user_token = get_session(conn, :user_token)
+    user_token && Accounts.delete_session_token(user_token)
+
+    if live_socket_id = get_session(conn, :live_socket_id) do
+      WikiWeb.Endpoint.broadcast(live_socket_id, "disconnect", %{})
+    end
+
+    conn
+    |> renew_session()
+    |> delete_resp_cookie(@remember_me_cookie)
+    |> redirect(to: "/")
+  end
+
+  @doc """
+  Authenticates the user by looking into the session
+  and remember me token.
+  """
+  def fetch_current_user(conn, _opts) do
+    {user_token, conn} = ensure_user_token(conn)
+    user = user_token && Accounts.get_user_by_session_token(user_token)
+    assign(conn, :current_user, user)
+  end
+
+  defp ensure_user_token(conn) do
+    if user_token = get_session(conn, :user_token) do
+      {user_token, conn}
+    else
+      conn = fetch_cookies(conn, signed: [@remember_me_cookie])
+
+      if user_token = conn.cookies[@remember_me_cookie] do
+        {user_token, put_session(conn, :user_token, user_token)}
+      else
+        {nil, conn}
+      end
+    end
+  end
+
+  @doc """
+  Used for routes that require the user to not be authenticated.
+  """
+  def redirect_if_user_is_authenticated(conn, _opts) do
+    if conn.assigns[:current_user] do
+      conn
+      |> redirect(to: signed_in_path(conn))
+      |> halt()
+    else
+      conn
+    end
+  end
+
+  @doc """
+  Used for routes that require the user to be authenticated.
+
+  If you want to enforce the user e-mail is confirmed before
+  they use the application at all, here would be a good place.
+  """
+  def require_authenticated_user(conn, _opts) do
+    if conn.assigns[:current_user] do
+      conn
+    else
+      conn
+      |> put_flash(:error, "You must log in to access this page.")
+      |> maybe_store_return_to()
+      |> redirect(to: Routes.user_session_path(conn, :new))
+      |> halt()
+    end
+  end
+
+  defp maybe_store_return_to(%{method: "GET", request_path: request_path} = conn) do
+    put_session(conn, :user_return_to, request_path)
+  end
+
+  defp maybe_store_return_to(conn), do: conn
+
+  defp signed_in_path(_conn), do: "/"
+end

lib/wiki_web/controllers/user_confirmation_controller.ex

@@ -0,0 +1,43 @@
+defmodule WikiWeb.UserConfirmationController do
+  use WikiWeb, :controller
+
+  alias Wiki.Accounts
+
+  def new(conn, _params) do
+    render(conn, "new.html")
+  end
+
+  def create(conn, %{"user" => %{"email" => email}}) do
+    if user = Accounts.get_user_by_email(email) do
+      Accounts.deliver_user_confirmation_instructions(
+        user,
+        &Routes.user_confirmation_url(conn, :confirm, &1)
+      )
+    end
+
+    # Regardless of the outcome, show an impartial success/error message.
+    conn
+    |> put_flash(
+      :info,
+      "If your e-mail is in our system and it has not been confirmed yet, " <>
+        "you will receive an e-mail with instructions shortly."
+    )
+    |> redirect(to: "/")
+  end
+
+  # Do not log in the user after confirmation to avoid a
+  # leaked token giving the user access to the account.
+  def confirm(conn, %{"token" => token}) do
+    case Accounts.confirm_user(token) do
+      {:ok, _} ->
+        conn
+        |> put_flash(:info, "Account confirmed successfully.")
+        |> redirect(to: "/")
+
+      :error ->
+        conn
+        |> put_flash(:error, "Confirmation link is invalid or it has expired.")
+        |> redirect(to: "/")
+    end
+  end
+end

lib/wiki_web/controllers/user_registration_controller.ex

@@ -0,0 +1,30 @@
+defmodule WikiWeb.UserRegistrationController do
+  use WikiWeb, :controller
+
+  alias Wiki.Accounts
+  alias Wiki.Accounts.User
+  alias WikiWeb.UserAuth
+
+  def new(conn, _params) do
+    changeset = Accounts.change_user_registration(%User{})
+    render(conn, "new.html", changeset: changeset)
+  end
+
+  def create(conn, %{"user" => user_params}) do
+    case Accounts.register_user(user_params) do
+      {:ok, user} ->
+        {:ok, _} =
+          Accounts.deliver_user_confirmation_instructions(
+            user,
+            &Routes.user_confirmation_url(conn, :confirm, &1)
+          )
+
+        conn
+        |> put_flash(:info, "User created successfully.")
+        |> UserAuth.log_in_user(user, user_params)
+
+      {:error, %Ecto.Changeset{} = changeset} ->
+        render(conn, "new.html", changeset: changeset)
+    end
+  end
+end

lib/wiki_web/controllers/user_reset_password_controller.ex

@@ -0,0 +1,59 @@
+defmodule WikiWeb.UserResetPasswordController do
+  use WikiWeb, :controller
+
+  alias Wiki.Accounts
+
+  plug :get_user_by_reset_password_token when action in [:edit, :update]
+
+  def new(conn, _params) do
+    render(conn, "new.html")
+  end
+
+  def create(conn, %{"user" => %{"email" => email}}) do
+    if user = Accounts.get_user_by_email(email) do
+      Accounts.deliver_user_reset_password_instructions(
+        user,
+        &Routes.user_reset_password_url(conn, :edit, &1)
+      )
+    end
+
+    # Regardless of the outcome, show an impartial success/error message.
+    conn
+    |> put_flash(
+      :info,
+      "If your e-mail is in our system, you will receive instructions to reset your password shortly."
+    )
+    |> redirect(to: "/")
+  end
+
+  def edit(conn, _params) do
+    render(conn, "edit.html", changeset: Accounts.change_user_password(conn.assigns.user))
+  end
+
+  # Do not log in the user after reset password to avoid a
+  # leaked token giving the user access to the account.
+  def update(conn, %{"user" => user_params}) do
+    case Accounts.reset_user_password(conn.assigns.user, user_params) do
+      {:ok, _} ->
+        conn
+        |> put_flash(:info, "Password reset successfully.")
+        |> redirect(to: Routes.user_session_path(conn, :new))
+
+      {:error, changeset} ->
+        render(conn, "edit.html", changeset: changeset)
+    end
+  end
+
+  defp get_user_by_reset_password_token(conn, _opts) do
+    %{"token" => token} = conn.params
+
+    if user = Accounts.get_user_by_reset_password_token(token) do
+      conn |> assign(:user, user) |> assign(:token, token)
+    else
+      conn
+      |> put_flash(:error, "Reset password link is invalid or it has expired.")
+      |> redirect(to: "/")
+      |> halt()
+    end
+  end
+end

lib/wiki_web/controllers/user_session_controller.ex

@@ -0,0 +1,26 @@
+defmodule WikiWeb.UserSessionController do
+  use WikiWeb, :controller
+
+  alias Wiki.Accounts
+  alias WikiWeb.UserAuth
+
+  def new(conn, _params) do
+    render(conn, "new.html", error_message: nil)
+  end
+
+  def create(conn, %{"user" => user_params}) do
+    %{"email" => email, "password" => password} = user_params
+
+    if user = Accounts.get_user_by_email_and_password(email, password) do
+      UserAuth.log_in_user(conn, user, user_params)
+    else
+      render(conn, "new.html", error_message: "Invalid e-mail or password")
+    end
+  end
+
+  def delete(conn, _params) do
+    conn
+    |> put_flash(:info, "Logged out successfully.")
+    |> UserAuth.log_out_user()
+  end
+end

lib/wiki_web/controllers/user_settings_controller.ex

@@ -0,0 +1,72 @@
+defmodule WikiWeb.UserSettingsController do
+  use WikiWeb, :controller
+
+  alias Wiki.Accounts
+  alias WikiWeb.UserAuth
+
+  plug :assign_email_and_password_changesets
+
+  def edit(conn, _params) do
+    render(conn, "edit.html")
+  end
+
+  def update_email(conn, %{"current_password" => password, "user" => user_params}) do
+    user = conn.assigns.current_user
+
+    case Accounts.apply_user_email(user, password, user_params) do
+      {:ok, applied_user} ->
+        Accounts.deliver_update_email_instructions(
+          applied_user,
+          user.email,
+          &Routes.user_settings_url(conn, :confirm_email, &1)
+        )
+
+        conn
+        |> put_flash(
+          :info,
+          "A link to confirm your e-mail change has been sent to the new address."
+        )
+        |> redirect(to: Routes.user_settings_path(conn, :edit))
+
+      {:error, changeset} ->
+        render(conn, "edit.html", email_changeset: changeset)
+    end
+  end
+
+  def confirm_email(conn, %{"token" => token}) do
+    case Accounts.update_user_email(conn.assigns.current_user, token) do
+      :ok ->
+        conn
+        |> put_flash(:info, "E-mail changed successfully.")
+        |> redirect(to: Routes.user_settings_path(conn, :edit))
+
+      :error ->
+        conn
+        |> put_flash(:error, "Email change link is invalid or it has expired.")
+        |> redirect(to: Routes.user_settings_path(conn, :edit))
+    end
+  end
+
+  def update_password(conn, %{"current_password" => password, "user" => user_params}) do
+    user = conn.assigns.current_user
+
+    case Accounts.update_user_password(user, password, user_params) do
+      {:ok, user} ->
+        conn
+        |> put_flash(:info, "Password updated successfully.")
+        |> put_session(:user_return_to, Routes.user_settings_path(conn, :edit))
+        |> UserAuth.log_in_user(user)
+
+      {:error, changeset} ->
+        render(conn, "edit.html", password_changeset: changeset)
+    end
+  end
+
+  defp assign_email_and_password_changesets(conn, _opts) do
+    user = conn.assigns.current_user
+
+    conn
+    |> assign(:email_changeset, Accounts.change_user_email(user))
+    |> assign(:password_changeset, Accounts.change_user_password(user))
+  end
+end

lib/wiki_web/endpoint.ex

@@ -0,0 +1,54 @@
+defmodule WikiWeb.Endpoint do
+  use Phoenix.Endpoint, otp_app: :wiki
+
+  # The session will be stored in the cookie and signed,
+  # this means its contents can be read but not tampered with.
+  # Set :encryption_salt if you would also like to encrypt it.
+  @session_options [
+    store: :cookie,
+    key: "_wiki_key",
+    signing_salt: "UVpYDAuL"
+  ]
+
+  socket "/socket", WikiWeb.UserSocket,
+    websocket: true,
+    longpoll: false
+
+  socket "/live", Phoenix.LiveView.Socket, websocket: [connect_info: [session: @session_options]]
+
+  # Serve at "/" the static files from "priv/static" directory.
+  #
+  # You should set gzip to true if you are running phx.digest
+  # when deploying your static files in production.
+  plug Plug.Static,
+    at: "/",
+    from: :wiki,
+    gzip: false,
+    only: ~w(css fonts images js favicon.ico robots.txt)
+
+  # Code reloading can be explicitly enabled under the
+  # :code_reloader configuration of your endpoint.
+  if code_reloading? do
+    socket "/phoenix/live_reload/socket", Phoenix.LiveReloader.Socket
+    plug Phoenix.LiveReloader
+    plug Phoenix.CodeReloader
+    plug Phoenix.Ecto.CheckRepoStatus, otp_app: :wiki
+  end
+
+  plug Phoenix.LiveDashboard.RequestLogger,
+    param_key: "request_logger",
+    cookie_key: "request_logger"
+
+  plug Plug.RequestId
+  plug Plug.Telemetry, event_prefix: [:phoenix, :endpoint]
+
+  plug Plug.Parsers,
+    parsers: [:urlencoded, :multipart, :json],
+    pass: ["*/*"],
+    json_decoder: Phoenix.json_library()
+
+  plug Plug.MethodOverride
+  plug Plug.Head
+  plug Plug.Session, @session_options
+  plug WikiWeb.Router
+end

lib/wiki_web/gettext.ex

@@ -0,0 +1,24 @@
+defmodule WikiWeb.Gettext do
+  @moduledoc """
+  A module providing Internationalization with a gettext-based API.
+
+  By using [Gettext](https://hexdocs.pm/gettext),
+  your module gains a set of macros for translations, for example:
+
+      import WikiWeb.Gettext
+
+      # Simple translation
+      gettext("Here is the string to translate")
+
+      # Plural translation
+      ngettext("Here is the string to translate",
+               "Here are the strings to translate",
+               3)
+
+      # Domain-based translation
+      dgettext("errors", "Here is the error message to translate")
+
+  See the [Gettext Docs](https://hexdocs.pm/gettext) for detailed usage.
+  """
+  use Gettext, otp_app: :wiki
+end

lib/wiki_web/router.ex

@@ -0,0 +1,80 @@
+defmodule WikiWeb.Router do
+  use WikiWeb, :router
+
+  import WikiWeb.UserAuth
+
+  pipeline :browser do
+    plug :accepts, ["html"]
+    plug :fetch_session
+    plug :fetch_flash
+    plug :protect_from_forgery
+    plug :put_secure_browser_headers
+    plug :fetch_current_user
+  end
+
+  pipeline :api do
+    plug :accepts, ["json"]
+  end
+
+  scope "/", WikiWeb do
+    pipe_through :browser
+
+    get "/", PageController, :index
+  end
+
+  # Other scopes may use custom stacks.
+  # scope "/api", WikiWeb do
+  #   pipe_through :api
+  # end
+
+  # Enables LiveDashboard only for development
+  #
+  # If you want to use the LiveDashboard in production, you should put
+  # it behind authentication and allow only admins to access it.
+  # If your application does not have an admins-only section yet,
+  # you can use Plug.BasicAuth to set up some basic authentication
+  # as long as you are also using SSL (which you should anyway).
+  if Mix.env() in [:dev, :test] do
+    import Phoenix.LiveDashboard.Router
+
+    scope "/" do
+      pipe_through :browser
+      live_dashboard "/dashboard", metrics: WikiWeb.Telemetry
+    end
+  end
+
+  ## Authentication routes
+
+  scope "/", WikiWeb do
+    pipe_through [:browser, :redirect_if_user_is_authenticated]
+
+    get "/users/register", UserRegistrationController, :new
+    post "/users/register", UserRegistrationController, :create
+    get "/users/log_in", UserSessionController, :new
+    post "/users/log_in", UserSessionController, :create
+    get "/users/reset_password", UserResetPasswordController, :new
+    post "/users/reset_password", UserResetPasswordController, :create
+    get "/users/reset_password/:token", UserResetPasswordController, :edit
+    put "/users/reset_password/:token", UserResetPasswordController, :update
+  end
+
+  scope "/", WikiWeb do
+    pipe_through [:browser, :require_authenticated_user]
+
+    get "/users/settings", UserSettingsController, :edit
+    put "/users/settings/update_password", UserSettingsController, :update_password
+    put "/users/settings/update_email", UserSettingsController, :update_email
+    get "/users/settings/confirm_email/:token", UserSettingsController, :confirm_email
+
+    resources "/pages", PageController
+  end
+
+  scope "/", WikiWeb do
+    pipe_through [:browser]
+
+    delete "/users/log_out", UserSessionController, :delete
+    get "/users/confirm", UserConfirmationController, :new
+    post "/users/confirm", UserConfirmationController, :create
+    get "/users/confirm/:token", UserConfirmationController, :confirm
+  end
+end

lib/wiki_web/telemetry.ex

@@ -0,0 +1,55 @@
+defmodule WikiWeb.Telemetry do
+  use Supervisor
+  import Telemetry.Metrics
+
+  def start_link(arg) do
+    Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
+  end
+
+  @impl true
+  def init(_arg) do
+    children = [
+      # Telemetry poller will execute the given period measurements
+      # every 10_000ms. Learn more here: https://hexdocs.pm/telemetry_metrics
+      {:telemetry_poller, measurements: periodic_measurements(), period: 10_000}
+      # Add reporters as children of your supervision tree.
+      # {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
+    ]
+
+    Supervisor.init(children, strategy: :one_for_one)
+  end
+
+  def metrics do
+    [
+      # Phoenix Metrics
+      summary("phoenix.endpoint.stop.duration",
+        unit: {:native, :millisecond}
+      ),
+      summary("phoenix.router_dispatch.stop.duration",
+        tags: [:route],
+        unit: {:native, :millisecond}
+      ),
+
+      # Database Metrics
+      summary("wiki.repo.query.total_time", unit: {:native, :millisecond}),
+      summary("wiki.repo.query.decode_time", unit: {:native, :millisecond}),
+      summary("wiki.repo.query.query_time", unit: {:native, :millisecond}),
+      summary("wiki.repo.query.queue_time", unit: {:native, :millisecond}),
+      summary("wiki.repo.query.idle_time", unit: {:native, :millisecond}),
+
+      # VM Metrics
+      summary("vm.memory.total", unit: {:byte, :kilobyte}),
+      summary("vm.total_run_queue_lengths.total"),
+      summary("vm.total_run_queue_lengths.cpu"),
+      summary("vm.total_run_queue_lengths.io")
+    ]
+  end
+
+  defp periodic_measurements do
+    [
+      # A module, function and arguments to be invoked periodically.
+      # This function must call :telemetry.execute/3 and a metric must be added above.
+      # {WikiWeb, :count_users, []}
+    ]
+  end
+end

lib/wiki_web/templates/layout/_user_menu.html.eex

@@ -0,0 +1,10 @@
+<ul>
+<%= if @current_user do %>
+  <li><%= @current_user.email %></li>
+  <li><%= link "Settings", to: Routes.user_settings_path(@conn, :edit) %></li>
+  <li><%= link "Log out", to: Routes.user_session_path(@conn, :delete), method: :delete %></li>
+<% else %>
+  <li><%= link "Register", to: Routes.user_registration_path(@conn, :new) %></li>
+  <li><%= link "Log in", to: Routes.user_session_path(@conn, :new) %></li>
+<% end %>
+</ul>

lib/wiki_web/templates/layout/app.html.eex

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8"/>
+    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+    <title>Wiki · Phoenix Framework</title>
+    <link rel="stylesheet" href="<%= Routes.static_path(@conn, "/css/app.css") %>"/>
+    <script defer type="text/javascript" src="<%= Routes.static_path(@conn, "/js/app.js") %>"></script>
+  </head>
+  <body>
+    <header>
+      <section class="container">
+        <nav role="navigation">
+          <ul>
+            <li><a href="https://hexdocs.pm/phoenix/overview.html">Get Started</a></li>
+            <%= if function_exported?(Routes, :live_dashboard_path, 2) do %>
+              <li><%= link "LiveDashboard", to: Routes.live_dashboard_path(@conn, :home) %></li>
+            <% end %>
+          </ul>
+          <%= render "_user_menu.html", assigns %>
+        </nav>
+        <a href="https://phoenixframework.org/" class="phx-logo">
+          <img src="<%= Routes.static_path(@conn, "/images/phoenix.png") %>" alt="Phoenix Framework Logo"/>
+        </a>
+      </section>
+    </header>
+    <main role="main" class="container">
+      <p class="alert alert-info" role="alert"><%= get_flash(@conn, :info) %></p>
+      <p class="alert alert-danger" role="alert"><%= get_flash(@conn, :error) %></p>
+      <%= @inner_content %>
+    </main>
+  </body>
+</html>

lib/wiki_web/templates/page/edit.html.eex

@@ -0,0 +1,5 @@
+<h1>Edit Page</h1>
+
+<%= render "form.html", Map.put(assigns, :action, Routes.page_path(@conn, :update, @page)) %>
+
+<span><%= link "Back", to: Routes.page_path(@conn, :index) %></span>

lib/wiki_web/templates/page/form.html.eex

@@ -0,0 +1,19 @@
+<%= form_for @changeset, @action, fn f -> %>
+  <%= if @changeset.action do %>
+    <div class="alert alert-danger">
+      <p>Oops, something went wrong! Please check the errors below.</p>
+    </div>
+  <% end %>
+
+  <%= label f, :title %>
+  <%= text_input f, :title %>
+  <%= error_tag f, :title %>
+
+  <%= label f, :content %>
+  <%= textarea f, :content %>
+  <%= error_tag f, :content %>
+
+  <div>
+    <%= submit "Save" %>
+  </div>
+<% end %>

lib/wiki_web/templates/page/index.html.eex

@@ -0,0 +1,28 @@
+<h1>Listing Pages</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>Title</th>
+      <th>Content</th>
+
+      <th></th>
+    </tr>
+  </thead>
+  <tbody>
+<%= for page <- @pages do %>
+    <tr>
+      <td><%= page.title %></td>
+      <td><%= page.content %></td>
+
+      <td>
+        <span><%= link "Show", to: Routes.page_path(@conn, :show, page) %></span>
+        <span><%= link "Edit", to: Routes.page_path(@conn, :edit, page) %></span>
+        <span><%= link "Delete", to: Routes.page_path(@conn, :delete, page), method: :delete, data: [confirm: "Are you sure?"] %></span>
+      </td>
+    </tr>
+<% end %>
+  </tbody>
+</table>
+
+<span><%= link "New Page", to: Routes.page_path(@conn, :new) %></span>

lib/wiki_web/templates/page/new.html.eex

@@ -0,0 +1,5 @@
+<h1>New Page</h1>
+
+<%= render "form.html", Map.put(assigns, :action, Routes.page_path(@conn, :create)) %>
+
+<span><%= link "Back", to: Routes.page_path(@conn, :index) %></span>

lib/wiki_web/templates/page/show.html.eex

@@ -0,0 +1,18 @@
+<h1>Show Page</h1>
+
+<ul>
+
+  <li>
+    <strong>Title:</strong>
+    <%= @page.title %>
+  </li>
+
+  <li>
+    <strong>Content:</strong>
+    <%= @page.content %>
+  </li>
+
+</ul>
+
+<span><%= link "Edit", to: Routes.page_path(@conn, :edit, @page) %></span>
+<span><%= link "Back", to: Routes.page_path(@conn, :index) %></span>

lib/wiki_web/templates/user_confirmation/new.html.eex

@@ -0,0 +1,15 @@
+<h1>Resend confirmation instructions</h1>
+
+<%= form_for :user, Routes.user_confirmation_path(@conn, :create), fn f -> %>
+  <%= label f, :email %>
+  <%= email_input f, :email, required: true %>
+
+  <div>
+    <%= submit "Resend confirmation instructions" %>
+  </div>
+<% end %>
+
+<p>
+  <%= link "Register", to: Routes.user_registration_path(@conn, :new) %> |
+  <%= link "Log in", to: Routes.user_session_path(@conn, :new) %>
+</p>

lib/wiki_web/templates/user_registration/new.html.eex

@@ -0,0 +1,26 @@
+<h1>Register</h1>
+
+<%= form_for @changeset, Routes.user_registration_path(@conn, :create), fn f -> %>
+  <%= if @changeset.action do %>
+    <div class="alert alert-danger">
+      <p>Oops, something went wrong! Please check the errors below.</p>
+    </div>
+  <% end %>
+
+  <%= label f, :email %>
+  <%= email_input f, :email, required: true %>
+  <%= error_tag f, :email %>
+
+  <%= label f, :password %>
+  <%= password_input f, :password, required: true %>
+  <%= error_tag f, :password %>
+
+  <div>
+    <%= submit "Register" %>
+  </div>
+<% end %>
+
+<p>
+  <%= link "Log in", to: Routes.user_session_path(@conn, :new) %> |
+  <%= link "Forgot your password?", to: Routes.user_reset_password_path(@conn, :new) %>
+</p>

lib/wiki_web/templates/user_reset_password/edit.html.eex

@@ -0,0 +1,26 @@
+<h1>Reset password</h1>
+
+<%= form_for @changeset, Routes.user_reset_password_path(@conn, :update, @token), fn f -> %>
+  <%= if @changeset.action do %>
+    <div class="alert alert-danger">
+      <p>Oops, something went wrong! Please check the errors below.</p>
+    </div>
+  <% end %>
+
+  <%= label f, :password, "New password" %>
+  <%= password_input f, :password, required: true %>
+  <%= error_tag f, :password %>
+
+  <%= label f, :password_confirmation, "Confirm new password" %>
+  <%= password_input f, :password_confirmation, required: true %>
+  <%= error_tag f, :password_confirmation %>
+
+  <div>
+    <%= submit "Reset password" %>
+  </div>
+<% end %>
+
+<p>
+  <%= link "Register", to: Routes.user_registration_path(@conn, :new) %> |
+  <%= link "Log in", to: Routes.user_session_path(@conn, :new) %>
+</p>

lib/wiki_web/templates/user_reset_password/new.html.eex

@@ -0,0 +1,15 @@
+<h1>Forgot your password?</h1>
+
+<%= form_for :user, Routes.user_reset_password_path(@conn, :create), fn f -> %>
+  <%= label f, :email %>
+  <%= email_input f, :email, required: true %>
+
+  <div>
+    <%= submit "Send instructions to reset password" %>
+  </div>
+<% end %>
+
+<p>
+  <%= link "Register", to: Routes.user_registration_path(@conn, :new) %> |
+  <%= link "Log in", to: Routes.user_session_path(@conn, :new) %>
+</p>

lib/wiki_web/templates/user_session/new.html.eex

@@ -0,0 +1,27 @@
+<h1>Log in</h1>
+
+<%= form_for @conn, Routes.user_session_path(@conn, :create), [as: :user], fn f -> %>
+  <%= if @error_message do %>
+    <div class="alert alert-danger">
+      <p><%= @error_message %></p>
+    </div>
+  <% end %>
+
+  <%= label f, :email %>
+  <%= email_input f, :email, required: true %>
+
+  <%= label f, :password %>
+  <%= password_input f, :password, required: true %>
+
+  <%= label f, :remember_me, "Keep me logged in for 60 days" %>
+  <%= checkbox f, :remember_me %>
+
+  <div>
+    <%= submit "Log in" %>
+  </div>
+<% end %>
+
+<p>
+  <%= link "Register", to: Routes.user_registration_path(@conn, :new) %> |
+  <%= link "Forgot your password?", to: Routes.user_reset_password_path(@conn, :new) %>
+</p>

lib/wiki_web/templates/user_settings/edit.html.eex

@@ -0,0 +1,49 @@
+<h1>Settings</h1>
+
+<h3>Change e-mail</h3>
+
+<%= form_for @email_changeset, Routes.user_settings_path(@conn, :update_email), fn f -> %>
+  <%= if @email_changeset.action do %>
+    <div class="alert alert-danger">
+      <p>Oops, something went wrong! Please check the errors below.</p>
+    </div>
+  <% end %>
+
+  <%= label f, :email %>
+  <%= email_input f, :email, required: true %>
+  <%= error_tag f, :email %>
+
+  <%= label f, :current_password, for: "current_password_for_email" %>
+  <%= password_input f, :current_password, required: true, name: "current_password", id: "current_password_for_email" %>
+  <%= error_tag f, :current_password %>
+
+  <div>
+    <%= submit "Change e-mail" %>
+  </div>
+<% end %>
+
+<h3>Change password</h3>
+
+<%= form_for @password_changeset, Routes.user_settings_path(@conn, :update_password), fn f -> %>
+  <%= if @password_changeset.action do %>
+    <div class="alert alert-danger">
+      <p>Oops, something went wrong! Please check the errors below.</p>
+    </div>
+  <% end %>
+
+  <%= label f, :password, "New password" %>
+  <%= password_input f, :password, required: true %>
+  <%= error_tag f, :password %>
+
+  <%= label f, :password_confirmation, "Confirm new password" %>
+  <%= password_input f, :password_confirmation, required: true %>
+  <%= error_tag f, :password_confirmation %>
+
+  <%= label f, :current_password, for: "current_password_for_password" %>
+  <%= password_input f, :current_password, required: true, name: "current_password", id: "current_password_for_password" %>
+  <%= error_tag f, :current_password %>
+
+  <div>
+    <%= submit "Change password" %>
+  </div>
+<% end %>

lib/wiki_web/views/error_helpers.ex

@@ -0,0 +1,47 @@
+defmodule WikiWeb.ErrorHelpers do
+  @moduledoc """
+  Conveniences for translating and building error messages.
+  """
+
+  use Phoenix.HTML
+
+  @doc """
+  Generates tag for inlined form input errors.
+  """
+  def error_tag(form, field) do
+    Enum.map(Keyword.get_values(form.errors, field), fn error ->
+      content_tag(:span, translate_error(error),
+        class: "invalid-feedback",
+        phx_feedback_for: input_id(form, field)
+      )
+    end)
+  end
+
+  @doc """
+  Translates an error message using gettext.
+  """
+  def translate_error({msg, opts}) do
+    # When using gettext, we typically pass the strings we want
+    # to translate as a static argument:
+    #
+    #     # Translate "is invalid" in the "errors" domain
+    #     dgettext("errors", "is invalid")
+    #
+    #     # Translate the number of files with plural rules
+    #     dngettext("errors", "1 file", "%{count} files", count)
+    #
+    # Because the error messages we show in our forms and APIs
+    # are defined inside Ecto, we need to translate them dynamically.
+    # This requires us to call the Gettext module passing our gettext
+    # backend as first argument.
+    #
+    # Note we use the "errors" domain, which means translations
+    # should be written to the errors.po file. The :count option is
+    # set by Ecto and indicates we should also apply plural rules.
+    if count = opts[:count] do
+      Gettext.dngettext(WikiWeb.Gettext, "errors", msg, msg, count, opts)
+    else
+      Gettext.dgettext(WikiWeb.Gettext, "errors", msg, opts)
+    end
+  end
+end

lib/wiki_web/views/error_view.ex

@@ -0,0 +1,16 @@
+defmodule WikiWeb.ErrorView do
+  use WikiWeb, :view
+
+  # If you want to customize a particular status code
+  # for a certain format, you may uncomment below.
+  # def render("500.html", _assigns) do
+  #   "Internal Server Error"
+  # end
+
+  # By default, Phoenix returns the status message from
+  # the template name. For example, "404.html" becomes
+  # "Not Found".
+  def template_not_found(template, _assigns) do
+    Phoenix.Controller.status_message_from_template(template)
+  end
+end

lib/wiki_web/views/layout_view.ex

@@ -0,0 +1,3 @@
+defmodule WikiWeb.LayoutView do
+  use WikiWeb, :view
+end

lib/wiki_web/views/page_view.ex

@@ -0,0 +1,3 @@
+defmodule WikiWeb.PageView do
+  use WikiWeb, :view
+end

lib/wiki_web/views/user_confirmation_view.ex

@@ -0,0 +1,3 @@
+defmodule WikiWeb.UserConfirmationView do
+  use WikiWeb, :view
+end

lib/wiki_web/views/user_registration_view.ex

@@ -0,0 +1,3 @@
+defmodule WikiWeb.UserRegistrationView do
+  use WikiWeb, :view
+end

lib/wiki_web/views/user_reset_password_view.ex

@@ -0,0 +1,3 @@
+defmodule WikiWeb.UserResetPasswordView do
+  use WikiWeb, :view
+end

lib/wiki_web/views/user_session_view.ex

@@ -0,0 +1,3 @@
+defmodule WikiWeb.UserSessionView do
+  use WikiWeb, :view
+end

lib/wiki_web/views/user_settings_view.ex

@@ -0,0 +1,3 @@
+defmodule WikiWeb.UserSettingsView do
+  use WikiWeb, :view
+end

mix.exs

@@ -0,0 +1,68 @@
+defmodule Wiki.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :wiki,
+      version: "0.1.0",
+      elixir: "~> 1.7",
+      elixirc_paths: elixirc_paths(Mix.env()),
+      compilers: [:phoenix, :gettext] ++ Mix.compilers(),
+      start_permanent: Mix.env() == :prod,
+      aliases: aliases(),
+      deps: deps()
+    ]
+  end
+
+  # Configuration for the OTP application.
+  #
+  # Type `mix help compile.app` for more information.
+  def application do
+    [
+      mod: {Wiki.Application, []},
+      extra_applications: [:logger, :runtime_tools]
+    ]
+  end
+
+  # Specifies which paths to compile per environment.
+  defp elixirc_paths(:test), do: ["lib", "test/support"]
+  defp elixirc_paths(_), do: ["lib"]
+
+  # Specifies your project dependencies.
+  #
+  # Type `mix help deps` for examples and options.
+  defp deps do
+    [
+      {:argon2_elixir, "~> 2.3.0"},
+      {:phoenix, "~> 1.5.4"},
+      {:phoenix_ecto, "~> 4.1"},
+      {:ecto_sql, "~> 3.4"},
+      {:postgrex, ">= 0.0.0"},
+      {:phoenix_html, "~> 2.11"},
+      {:phoenix_live_reload, "~> 1.2", only: :dev},
+      {:phoenix_live_dashboard, "~> 0.2"},
+      {:telemetry_metrics, "~> 0.4"},
+      {:telemetry_poller, "~> 0.4"},
+      {:gettext, "~> 0.11"},
+      {:jason, "~> 1.0"},
+      {:plug_cowboy, "~> 2.0"},
+      {:phx_gen_auth, "~> 0.4.0", only: :dev, runtime: false},
+      {:earmark, "~> 1.4.10"}
+    ]
+  end
+
+  # Aliases are shortcuts or tasks specific to the current project.
+  # For example, to install project dependencies and perform other setup tasks, run:
+  #
+  #     $ mix setup
+  #
+  # See the documentation for `Mix` for more info on aliases.
+  defp aliases do
+    [
+      setup: ["deps.get", "ecto.setup", "cmd npm install --prefix assets"],
+      "ecto.setup": ["ecto.create", "ecto.migrate", "run priv/repo/seeds.exs"],
+      "ecto.reset": ["ecto.drop", "ecto.setup"],
+      test: ["ecto.create --quiet", "ecto.migrate --quiet", "test"]
+    ]
+  end
+end

mix.lock

@@ -0,0 +1,36 @@
+%{
+  "argon2_elixir": {:hex, :argon2_elixir, "2.3.0", "e251bdafd69308e8c1263e111600e6d68bd44f23d2cccbe43fcb1a417a76bc8e", [:make, :mix], [{:comeonin, "~> 5.3", [hex: :comeonin, repo: "hexpm", optional: false]}, {:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "28ccb63bff213aecec1f7f3dde9648418b031f822499973281d8f494b9d5a3b3"},
+  "bcrypt_elixir": {:hex, :bcrypt_elixir, "2.2.0", "3df902b81ce7fa8867a2ae30d20a1da6877a2c056bfb116fd0bc8a5f0190cea4", [:make, :mix], [{:comeonin, "~> 5.3", [hex: :comeonin, repo: "hexpm", optional: false]}, {:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "762be3fcb779f08207531bc6612cca480a338e4b4357abb49f5ce00240a77d1e"},
+  "comeonin": {:hex, :comeonin, "5.3.1", "7fe612b739c78c9c1a75186ef2d322ce4d25032d119823269d0aa1e2f1e20025", [:mix], [], "hexpm", "d6222483060c17f0977fad1b7401ef0c5863c985a64352755f366aee3799c245"},
+  "connection": {:hex, :connection, "1.0.4", "a1cae72211f0eef17705aaededacac3eb30e6625b04a6117c1b2db6ace7d5976", [:mix], [], "hexpm", "4a0850c9be22a43af9920a71ab17c051f5f7d45c209e40269a1938832510e4d9"},
+  "cowboy": {:hex, :cowboy, "2.8.0", "f3dc62e35797ecd9ac1b50db74611193c29815401e53bac9a5c0577bd7bc667d", [:rebar3], [{:cowlib, "~> 2.9.1", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "~> 1.7.1", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "4643e4fba74ac96d4d152c75803de6fad0b3fa5df354c71afdd6cbeeb15fac8a"},
+  "cowlib": {:hex, :cowlib, "2.9.1", "61a6c7c50cf07fdd24b2f45b89500bb93b6686579b069a89f88cb211e1125c78", [:rebar3], [], "hexpm", "e4175dc240a70d996156160891e1c62238ede1729e45740bdd38064dad476170"},
+  "db_connection": {:hex, :db_connection, "2.2.2", "3bbca41b199e1598245b716248964926303b5d4609ff065125ce98bcd368939e", [:mix], [{:connection, "~> 1.0.2", [hex: :connection, repo: "hexpm", optional: false]}], "hexpm", "642af240d8a8affb93b4ba5a6fcd2bbcbdc327e1a524b825d383711536f8070c"},
+  "decimal": {:hex, :decimal, "1.8.1", "a4ef3f5f3428bdbc0d35374029ffcf4ede8533536fa79896dd450168d9acdf3c", [:mix], [], "hexpm", "3cb154b00225ac687f6cbd4acc4b7960027c757a5152b369923ead9ddbca7aec"},
+  "earmark": {:hex, :earmark, "1.4.10", "bddce5e8ea37712a5bfb01541be8ba57d3b171d3fa4f80a0be9bcf1db417bcaf", [:mix], [{:earmark_parser, ">= 1.4.10", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "12dbfa80810478e521d3ffb941ad9fbfcbbd7debe94e1341b4c4a1b2411c1c27"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.10", "6603d7a603b9c18d3d20db69921527f82ef09990885ed7525003c7fe7dc86c56", [:mix], [], "hexpm", "8e2d5370b732385db2c9b22215c3f59c84ac7dda7ed7e544d7c459496ae519c0"},
+  "ecto": {:hex, :ecto, "3.4.5", "2bcd262f57b2c888b0bd7f7a28c8a48aa11dc1a2c6a858e45dd8f8426d504265", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "8c6d1d4d524559e9b7a062f0498e2c206122552d63eacff0a6567ffe7a8e8691"},
+  "ecto_sql": {:hex, :ecto_sql, "3.4.5", "30161f81b167d561a9a2df4329c10ae05ff36eca7ccc84628f2c8b9fa1e43323", [:mix], [{:db_connection, "~> 2.2", [hex: :db_connection, repo: "hexpm", optional: false]}, {:ecto, "~> 3.4.3", [hex: :ecto, repo: "hexpm", optional: false]}, {:myxql, "~> 0.3.0 or ~> 0.4.0", [hex: :myxql, repo: "hexpm", optional: true]}, {:postgrex, "~> 0.15.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:tds, "~> 2.1.0", [hex: :tds, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "31990c6a3579b36a3c0841d34a94c275e727de8b84f58509da5f1b2032c98ac2"},
+  "elixir_make": {:hex, :elixir_make, "0.6.0", "38349f3e29aff4864352084fc736fa7fa0f2995a819a737554f7ebd28b85aaab", [:mix], [], "hexpm", "d522695b93b7f0b4c0fcb2dfe73a6b905b1c301226a5a55cb42e5b14d509e050"},
+  "file_system": {:hex, :file_system, "0.2.8", "f632bd287927a1eed2b718f22af727c5aeaccc9a98d8c2bd7bff709e851dc986", [:mix], [], "hexpm", "97a3b6f8d63ef53bd0113070102db2ce05352ecf0d25390eb8d747c2bde98bca"},
+  "gettext": {:hex, :gettext, "0.18.0", "406d6b9e0e3278162c2ae1de0a60270452c553536772167e2d701f028116f870", [:mix], [], "hexpm", "c3f850be6367ebe1a08616c2158affe4a23231c70391050bf359d5f92f66a571"},
+  "jason": {:hex, :jason, "1.2.1", "12b22825e22f468c02eb3e4b9985f3d0cb8dc40b9bd704730efa11abd2708c44", [:mix], [{:decimal, "~> 1.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "b659b8571deedf60f79c5a608e15414085fa141344e2716fbd6988a084b5f993"},
+  "mime": {:hex, :mime, "1.3.1", "30ce04ab3175b6ad0bdce0035cba77bba68b813d523d1aac73d9781b4d193cf8", [:mix], [], "hexpm", "6cbe761d6a0ca5a31a0931bf4c63204bceb64538e664a8ecf784a9a6f3b875f1"},
+  "pbkdf2_elixir": {:hex, :pbkdf2_elixir, "1.2.1", "9cbe354b58121075bd20eb83076900a3832324b7dd171a6895fab57b6bb2752c", [:mix], [{:comeonin, "~> 5.3", [hex: :comeonin, repo: "hexpm", optional: false]}], "hexpm", "d3b40a4a4630f0b442f19eca891fcfeeee4c40871936fed2f68e1c4faa30481f"},
+  "phoenix": {:hex, :phoenix, "1.5.4", "0fca9ce7e960f9498d6315e41fcd0c80bfa6fbeb5fa3255b830c67fdfb7e703f", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix_html, "~> 2.13", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 2.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:plug, "~> 1.10", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 1.0 or ~> 2.2", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:plug_crypto, "~> 1.1.2 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "4e516d131fde87b568abd62e1b14aa07ba7d5edfd230bab4e25cc9dedbb39135"},
+  "phoenix_ecto": {:hex, :phoenix_ecto, "4.1.0", "a044d0756d0464c5a541b4a0bf4bcaf89bffcaf92468862408290682c73ae50d", [:mix], [{:ecto, "~> 3.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 2.9", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "c5e666a341ff104d0399d8f0e4ff094559b2fde13a5985d4cb5023b2c2ac558b"},
+  "phoenix_html": {:hex, :phoenix_html, "2.14.2", "b8a3899a72050f3f48a36430da507dd99caf0ac2d06c77529b1646964f3d563e", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "58061c8dfd25da5df1ea0ca47c972f161beb6c875cd293917045b92ffe1bf617"},
+  "phoenix_live_dashboard": {:hex, :phoenix_live_dashboard, "0.2.7", "21564144897109ac486518651fecd09403a4d9df4d8432e7dcdf156df6a6a31a", [:mix], [{:phoenix_html, "~> 2.14.1 or ~> 2.15", [hex: :phoenix_html, repo: "hexpm", optional: false]}, {:phoenix_live_view, "~> 0.14.0", [hex: :phoenix_live_view, repo: "hexpm", optional: false]}, {:telemetry_metrics, "~> 0.4.0 or ~> 0.5.0", [hex: :telemetry_metrics, repo: "hexpm", optional: false]}], "hexpm", "2204c2c6755da7b39a21e312253b93d977cc846c85df8a6c0d9f9505cd8bf15b"},
+  "phoenix_live_reload": {:hex, :phoenix_live_reload, "1.2.4", "940c0344b1d66a2e46eef02af3a70e0c5bb45a4db0bf47917add271b76cd3914", [:mix], [{:file_system, "~> 0.2.1 or ~> 0.3", [hex: :file_system, repo: "hexpm", optional: false]}, {:phoenix, "~> 1.4", [hex: :phoenix, repo: "hexpm", optional: false]}], "hexpm", "38f9308357dea4cc77f247e216da99fcb0224e05ada1469167520bed4cb8cccd"},
+  "phoenix_live_view": {:hex, :phoenix_live_view, "0.14.3", "3415a9ee405d8e0c9a250c1778098243ad38004a654ff3b2d0ceaab6cc21e234", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix, "~> 1.5.3", [hex: :phoenix, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 2.14", [hex: :phoenix_html, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.2 or ~> 0.5", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "d2dd7e8b5c517efadea033250f4446d5a10cd340c69cc4c6aa54fc9ca5222305"},
+  "phoenix_pubsub": {:hex, :phoenix_pubsub, "2.0.0", "a1ae76717bb168cdeb10ec9d92d1480fec99e3080f011402c0a2d68d47395ffb", [:mix], [], "hexpm", "c52d948c4f261577b9c6fa804be91884b381a7f8f18450c5045975435350f771"},
+  "phx_gen_auth": {:hex, :phx_gen_auth, "0.4.0", "f506d1e5dd201145480b2889ac9f26043187efc580d72a13a49b944542aabf1b", [:mix], [{:phoenix, "~> 1.5.2", [hex: :phoenix, repo: "hexpm", optional: false]}], "hexpm", "c029c554bc7c7dff8693d4476f85b3dabd08f87f9b2cbfadaf5e1b6365e44838"},
+  "plug": {:hex, :plug, "1.10.3", "c9cebe917637d8db0e759039cc106adca069874e1a9034fd6e3fdd427fd3c283", [:mix], [{:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "01f9037a2a1de1d633b5a881101e6a444bcabb1d386ca1e00bb273a1f1d9d939"},
+  "plug_cowboy": {:hex, :plug_cowboy, "2.3.0", "149a50e05cb73c12aad6506a371cd75750c0b19a32f81866e1a323dda9e0e99d", [:mix], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:plug, "~> 1.7", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "bc595a1870cef13f9c1e03df56d96804db7f702175e4ccacdb8fc75c02a7b97e"},
+  "plug_crypto": {:hex, :plug_crypto, "1.1.2", "bdd187572cc26dbd95b87136290425f2b580a116d3fb1f564216918c9730d227", [:mix], [], "hexpm", "6b8b608f895b6ffcfad49c37c7883e8df98ae19c6a28113b02aa1e9c5b22d6b5"},
+  "postgrex": {:hex, :postgrex, "0.15.5", "aec40306a622d459b01bff890fa42f1430dac61593b122754144ad9033a2152f", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}, {:db_connection, "~> 2.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.5", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "ed90c81e1525f65a2ba2279dbcebf030d6d13328daa2f8088b9661eb9143af7f"},
+  "ranch": {:hex, :ranch, "1.7.1", "6b1fab51b49196860b733a49c07604465a47bdb78aa10c1c16a3d199f7f8c881", [:rebar3], [], "hexpm", "451d8527787df716d99dc36162fca05934915db0b6141bbdac2ea8d3c7afc7d7"},
+  "telemetry": {:hex, :telemetry, "0.4.2", "2808c992455e08d6177322f14d3bdb6b625fbcfd233a73505870d8738a2f4599", [:rebar3], [], "hexpm", "2d1419bd9dda6a206d7b5852179511722e2b18812310d304620c7bd92a13fcef"},
+  "telemetry_metrics": {:hex, :telemetry_metrics, "0.5.0", "1b796e74add83abf844e808564275dfb342bcc930b04c7577ab780e262b0d998", [:mix], [{:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "31225e6ce7a37a421a0a96ec55244386aec1c190b22578bd245188a4a33298fd"},
+  "telemetry_poller": {:hex, :telemetry_poller, "0.5.1", "21071cc2e536810bac5628b935521ff3e28f0303e770951158c73eaaa01e962a", [:rebar3], [{:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "4cab72069210bc6e7a080cec9afffad1b33370149ed5d379b81c7c5f0c663fd4"},
+}

priv/gettext/en/LC_MESSAGES/errors.po

@@ -0,0 +1,97 @@
+## `msgid`s in this file come from POT (.pot) files.
+##
+## Do not add, change, or remove `msgid`s manually here as
+## they're tied to the ones in the corresponding POT file
+## (with the same domain).
+##
+## Use `mix gettext.extract --merge` or `mix gettext.merge`
+## to merge POT files into PO files.
+msgid ""
+msgstr ""
+"Language: en\n"
+
+## From Ecto.Changeset.cast/4
+msgid "can't be blank"
+msgstr ""
+
+## From Ecto.Changeset.unique_constraint/3
+msgid "has already been taken"
+msgstr ""
+
+## From Ecto.Changeset.put_change/3
+msgid "is invalid"
+msgstr ""
+
+## From Ecto.Changeset.validate_acceptance/3
+msgid "must be accepted"
+msgstr ""
+
+## From Ecto.Changeset.validate_format/3
+msgid "has invalid format"
+msgstr ""
+
+## From Ecto.Changeset.validate_subset/3
+msgid "has an invalid entry"
+msgstr ""
+
+## From Ecto.Changeset.validate_exclusion/3
+msgid "is reserved"
+msgstr ""
+
+## From Ecto.Changeset.validate_confirmation/3
+msgid "does not match confirmation"
+msgstr ""
+
+## From Ecto.Changeset.no_assoc_constraint/3
+msgid "is still associated with this entry"
+msgstr ""
+
+msgid "are still associated with this entry"
+msgstr ""
+
+## From Ecto.Changeset.validate_length/3
+msgid "should be %{count} character(s)"
+msgid_plural "should be %{count} character(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should have %{count} item(s)"
+msgid_plural "should have %{count} item(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should be at least %{count} character(s)"
+msgid_plural "should be at least %{count} character(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should have at least %{count} item(s)"
+msgid_plural "should have at least %{count} item(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should be at most %{count} character(s)"
+msgid_plural "should be at most %{count} character(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should have at most %{count} item(s)"
+msgid_plural "should have at most %{count} item(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+## From Ecto.Changeset.validate_number/3
+msgid "must be less than %{number}"
+msgstr ""
+
+msgid "must be greater than %{number}"
+msgstr ""
+
+msgid "must be less than or equal to %{number}"
+msgstr ""
+
+msgid "must be greater than or equal to %{number}"
+msgstr ""
+
+msgid "must be equal to %{number}"
+msgstr ""

priv/gettext/errors.pot

@@ -0,0 +1,95 @@
+## This is a PO Template file.
+##
+## `msgid`s here are often extracted from source code.
+## Add new translations manually only if they're dynamic
+## translations that can't be statically extracted.
+##
+## Run `mix gettext.extract` to bring this file up to
+## date. Leave `msgstr`s empty as changing them here has no
+## effect: edit them in PO (`.po`) files instead.
+
+## From Ecto.Changeset.cast/4
+msgid "can't be blank"
+msgstr ""
+
+## From Ecto.Changeset.unique_constraint/3
+msgid "has already been taken"
+msgstr ""
+
+## From Ecto.Changeset.put_change/3
+msgid "is invalid"
+msgstr ""
+
+## From Ecto.Changeset.validate_acceptance/3
+msgid "must be accepted"
+msgstr ""
+
+## From Ecto.Changeset.validate_format/3
+msgid "has invalid format"
+msgstr ""
+
+## From Ecto.Changeset.validate_subset/3
+msgid "has an invalid entry"
+msgstr ""
+
+## From Ecto.Changeset.validate_exclusion/3
+msgid "is reserved"
+msgstr ""
+
+## From Ecto.Changeset.validate_confirmation/3
+msgid "does not match confirmation"
+msgstr ""
+
+## From Ecto.Changeset.no_assoc_constraint/3
+msgid "is still associated with this entry"
+msgstr ""
+
+msgid "are still associated with this entry"
+msgstr ""
+
+## From Ecto.Changeset.validate_length/3
+msgid "should be %{count} character(s)"
+msgid_plural "should be %{count} character(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should have %{count} item(s)"
+msgid_plural "should have %{count} item(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should be at least %{count} character(s)"
+msgid_plural "should be at least %{count} character(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should have at least %{count} item(s)"
+msgid_plural "should have at least %{count} item(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should be at most %{count} character(s)"
+msgid_plural "should be at most %{count} character(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "should have at most %{count} item(s)"
+msgid_plural "should have at most %{count} item(s)"
+msgstr[0] ""
+msgstr[1] ""
+
+## From Ecto.Changeset.validate_number/3
+msgid "must be less than %{number}"
+msgstr ""
+
+msgid "must be greater than %{number}"
+msgstr ""
+
+msgid "must be less than or equal to %{number}"
+msgstr ""
+
+msgid "must be greater than or equal to %{number}"
+msgstr ""
+
+msgid "must be equal to %{number}"
+msgstr ""

priv/repo/migrations/.formatter.exs

@@ -0,0 +1,4 @@
+[
+  import_deps: [:ecto_sql],
+  inputs: ["*.exs"]
+]

priv/repo/migrations/20200725232356_create_users_auth_tables.exs

@@ -0,0 +1,28 @@
+defmodule Wiki.Repo.Migrations.CreateUsersAuthTables do
+  use Ecto.Migration
+
+  def change do
+    execute "CREATE EXTENSION IF NOT EXISTS citext", ""
+
+    create table(:users) do
+      add :email, :citext, null: false
+      add :hashed_password, :string, null: false
+      add :confirmed_at, :naive_datetime
+      add :content_encryption_key_salt, :binary
+      timestamps()
+    end
+
+    create unique_index(:users, [:email])
+
+    create table(:users_tokens) do
+      add :user_id, references(:users, on_delete: :delete_all), null: false
+      add :token, :binary, null: false
+      add :context, :string, null: false
+      add :sent_to, :string
+      timestamps(updated_at: false)
+    end
+
+    create index(:users_tokens, [:user_id])
+    create unique_index(:users_tokens, [:context, :token])
+  end
+end

priv/repo/migrations/20200726020001_create_pages.exs

@@ -0,0 +1,17 @@
+defmodule Wiki.Repo.Migrations.CreatePages do
+  use Ecto.Migration
+
+  def change do
+    create table(:pages) do
+      add :title, :string
+      add :encrypted_content, :binary
+      add :encrypted_content_iv, :binary
+      add :encrypted_content_tag, :binary
+      add :user_id, references(:users, on_delete: :nothing)
+
+      timestamps()
+    end
+
+    create index(:pages, [:user_id])
+  end
+end

priv/repo/seeds.exs

@@ -0,0 +1,11 @@
+# Script for populating the database. You can run it as:
+#
+#     mix run priv/repo/seeds.exs
+#
+# Inside the script, you can read and write to any of your
+# repositories directly:
+#
+#     Wiki.Repo.insert!(%Wiki.SomeSchema{})
+#
+# We recommend using the bang functions (`insert!`, `update!`
+# and so on) as they will fail if something goes wrong.

test/support/channel_case.ex

@@ -0,0 +1,40 @@
+defmodule WikiWeb.ChannelCase do
+  @moduledoc """
+  This module defines the test case to be used by
+  channel tests.
+
+  Such tests rely on `Phoenix.ChannelTest` and also
+  import other functionality to make it easier
+  to build common data structures and query the data layer.
+
+  Finally, if the test case interacts with the database,
+  we enable the SQL sandbox, so changes done to the database
+  are reverted at the end of every test. If you are using
+  PostgreSQL, you can even run database tests asynchronously
+  by setting `use WikiWeb.ChannelCase, async: true`, although
+  this option is not recommended for other databases.
+  """
+
+  use ExUnit.CaseTemplate
+
+  using do
+    quote do
+      # Import conveniences for testing with channels
+      import Phoenix.ChannelTest
+      import WikiWeb.ChannelCase
+
+      # The default endpoint for testing
+      @endpoint WikiWeb.Endpoint
+    end
+  end
+
+  setup tags do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(Wiki.Repo)
+
+    unless tags[:async] do
+      Ecto.Adapters.SQL.Sandbox.mode(Wiki.Repo, {:shared, self()})
+    end
+
+    :ok
+  end
+end

test/support/conn_case.ex

@@ -0,0 +1,69 @@
+defmodule WikiWeb.ConnCase do
+  @moduledoc """
+  This module defines the test case to be used by
+  tests that require setting up a connection.
+
+  Such tests rely on `Phoenix.ConnTest` and also
+  import other functionality to make it easier
+  to build common data structures and query the data layer.
+
+  Finally, if the test case interacts with the database,
+  we enable the SQL sandbox, so changes done to the database
+  are reverted at the end of every test. If you are using
+  PostgreSQL, you can even run database tests asynchronously
+  by setting `use WikiWeb.ConnCase, async: true`, although
+  this option is not recommended for other databases.
+  """
+
+  use ExUnit.CaseTemplate
+
+  using do
+    quote do
+      # Import conveniences for testing with connections
+      import Plug.Conn
+      import Phoenix.ConnTest
+      import WikiWeb.ConnCase
+
+      alias WikiWeb.Router.Helpers, as: Routes
+
+      # The default endpoint for testing
+      @endpoint WikiWeb.Endpoint
+    end
+  end
+
+  setup tags do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(Wiki.Repo)
+
+    unless tags[:async] do
+      Ecto.Adapters.SQL.Sandbox.mode(Wiki.Repo, {:shared, self()})
+    end
+
+    {:ok, conn: Phoenix.ConnTest.build_conn()}
+  end
+
+  @doc """
+  Setup helper that registers and logs in users.
+
+      setup :register_and_log_in_user
+
+  It stores an updated connection and a registered user in the
+  test context.
+  """
+  def register_and_log_in_user(%{conn: conn}) do
+    user = Wiki.AccountsFixtures.user_fixture()
+    %{conn: log_in_user(conn, user), user: user}
+  end
+
+  @doc """
+  Logs the given `user` into the `conn`.
+
+  It returns an updated `conn`.
+  """
+  def log_in_user(conn, user) do
+    token = Wiki.Accounts.generate_user_session_token(user)
+
+    conn
+    |> Phoenix.ConnTest.init_test_session(%{})
+    |> Plug.Conn.put_session(:user_token, token)
+  end
+end

test/support/data_case.ex

@@ -0,0 +1,55 @@
+defmodule Wiki.DataCase do
+  @moduledoc """
+  This module defines the setup for tests requiring
+  access to the application's data layer.
+
+  You may define functions here to be used as helpers in
+  your tests.
+
+  Finally, if the test case interacts with the database,
+  we enable the SQL sandbox, so changes done to the database
+  are reverted at the end of every test. If you are using
+  PostgreSQL, you can even run database tests asynchronously
+  by setting `use Wiki.DataCase, async: true`, although
+  this option is not recommended for other databases.
+  """
+
+  use ExUnit.CaseTemplate
+
+  using do
+    quote do
+      alias Wiki.Repo
+
+      import Ecto
+      import Ecto.Changeset
+      import Ecto.Query
+      import Wiki.DataCase
+    end
+  end
+
+  setup tags do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(Wiki.Repo)
+
+    unless tags[:async] do
+      Ecto.Adapters.SQL.Sandbox.mode(Wiki.Repo, {:shared, self()})
+    end
+
+    :ok
+  end
+
+  @doc """
+  A helper that transforms changeset errors into a map of messages.
+
+      assert {:error, changeset} = Accounts.create_user(%{password: "short"})
+      assert "password is too short" in errors_on(changeset).password
+      assert %{password: ["password is too short"]} = errors_on(changeset)
+
+  """
+  def errors_on(changeset) do
+    Ecto.Changeset.traverse_errors(changeset, fn {message, opts} ->
+      Regex.replace(~r"%{(\w+)}", message, fn _, key ->
+        opts |> Keyword.get(String.to_existing_atom(key), key) |> to_string()
+      end)
+    end)
+  end
+end

test/support/fixtures/accounts_fixtures.ex

@@ -0,0 +1,27 @@
+defmodule Wiki.AccountsFixtures do
+  @moduledoc """
+  This module defines test helpers for creating
+  entities via the `Wiki.Accounts` context.
+  """
+
+  def unique_user_email, do: "user#{System.unique_integer()}@example.com"
+  def valid_user_password, do: "hello world!"
+
+  def user_fixture(attrs \\ %{}) do
+    {:ok, user} =
+      attrs
+      |> Enum.into(%{
+        email: unique_user_email(),
+        password: valid_user_password()
+      })
+      |> Wiki.Accounts.register_user()
+
+    user
+  end
+
+  def extract_user_token(fun) do
+    {:ok, captured} = fun.(&"[TOKEN]#{&1}[TOKEN]")
+    [_, token, _] = String.split(captured.body, "[TOKEN]")
+    token
+  end
+end

test/test_helper.exs

@@ -0,0 +1,2 @@
+ExUnit.start()
+Ecto.Adapters.SQL.Sandbox.mode(Wiki.Repo, :manual)

test/wiki/accounts_test.exs

@@ -0,0 +1,480 @@
+defmodule Wiki.AccountsTest do
+  use Wiki.DataCase
+
+  alias Wiki.Accounts
+  import Wiki.AccountsFixtures
+  alias Wiki.Accounts.{User, UserToken}
+
+  describe "get_user_by_email/1" do
+    test "does not return the user if the email does not exist" do
+      refute Accounts.get_user_by_email("unknown@example.com")
+    end
+
+    test "returns the user if the email exists" do
+      %{id: id} = user = user_fixture()
+      assert %User{id: ^id} = Accounts.get_user_by_email(user.email)
+    end
+  end
+
+  describe "get_user_by_email_and_password/1" do
+    test "does not return the user if the email does not exist" do
+      refute Accounts.get_user_by_email_and_password("unknown@example.com", "hello world!")
+    end
+
+    test "does not return the user if the password is not valid" do
+      user = user_fixture()
+      refute Accounts.get_user_by_email_and_password(user.email, "invalid")
+    end
+
+    test "returns the user if the email and password are valid" do
+      %{id: id} = user = user_fixture()
+
+      assert %User{id: ^id} =
+               Accounts.get_user_by_email_and_password(user.email, valid_user_password())
+    end
+  end
+
+  describe "get_user!/1" do
+    test "raises if id is invalid" do
+      assert_raise Ecto.NoResultsError, fn ->
+        Accounts.get_user!(-1)
+      end
+    end
+
+    test "returns the user with the given id" do
+      %{id: id} = user = user_fixture()
+      assert %User{id: ^id} = Accounts.get_user!(user.id)
+    end
+  end
+
+  describe "register_user/1" do
+    test "requires email and password to be set" do
+      {:error, changeset} = Accounts.register_user(%{})
+
+      assert %{
+               password: ["can't be blank"],
+               email: ["can't be blank"]
+             } = errors_on(changeset)
+    end
+
+    test "validates email and password when given" do
+      {:error, changeset} = Accounts.register_user(%{email: "not valid", password: "not valid"})
+
+      assert %{
+               email: ["must have the @ sign and no spaces"],
+               password: ["should be at least 12 character(s)"]
+             } = errors_on(changeset)
+    end
+
+    test "validates maximum values for e-mail and password for security" do
+      too_long = String.duplicate("db", 100)
+      {:error, changeset} = Accounts.register_user(%{email: too_long, password: too_long})
+      assert "should be at most 160 character(s)" in errors_on(changeset).email
+      assert "should be at most 80 character(s)" in errors_on(changeset).password
+    end
+
+    test "validates e-mail uniqueness" do
+      %{email: email} = user_fixture()
+      {:error, changeset} = Accounts.register_user(%{email: email})
+      assert "has already been taken" in errors_on(changeset).email
+
+      # Now try with the upper cased e-mail too, to check that email case is ignored.
+      {:error, changeset} = Accounts.register_user(%{email: String.upcase(email)})
+      assert "has already been taken" in errors_on(changeset).email
+    end
+
+    test "registers users with a hashed password" do
+      email = unique_user_email()
+      {:ok, user} = Accounts.register_user(%{email: email, password: valid_user_password()})
+      assert user.email == email
+      assert is_binary(user.hashed_password)
+      assert is_nil(user.confirmed_at)
+      assert is_nil(user.password)
+    end
+  end
+
+  describe "change_user_registration/2" do
+    test "returns a changeset" do
+      assert %Ecto.Changeset{} = changeset = Accounts.change_user_registration(%User{})
+      assert changeset.required == [:password, :email]
+    end
+  end
+
+  describe "change_user_email/2" do
+    test "returns a user changeset" do
+      assert %Ecto.Changeset{} = changeset = Accounts.change_user_email(%User{})
+      assert changeset.required == [:email]
+    end
+  end
+
+  describe "apply_user_email/3" do
+    setup do
+      %{user: user_fixture()}
+    end
+
+    test "requires email to change", %{user: user} do
+      {:error, changeset} = Accounts.apply_user_email(user, valid_user_password(), %{})
+      assert %{email: ["did not change"]} = errors_on(changeset)
+    end
+
+    test "validates email", %{user: user} do
+      {:error, changeset} =
+        Accounts.apply_user_email(user, valid_user_password(), %{email: "not valid"})
+
+      assert %{email: ["must have the @ sign and no spaces"]} = errors_on(changeset)
+    end
+
+    test "validates maximum value for e-mail for security", %{user: user} do
+      too_long = String.duplicate("db", 100)
+
+      {:error, changeset} =
+        Accounts.apply_user_email(user, valid_user_password(), %{email: too_long})
+
+      assert "should be at most 160 character(s)" in errors_on(changeset).email
+    end
+
+    test "validates e-mail uniqueness", %{user: user} do
+      %{email: email} = user_fixture()
+
+      {:error, changeset} =
+        Accounts.apply_user_email(user, valid_user_password(), %{email: email})
+
+      assert "has already been taken" in errors_on(changeset).email
+    end
+
+    test "validates current password", %{user: user} do
+      {:error, changeset} =
+        Accounts.apply_user_email(user, "invalid", %{email: unique_user_email()})
+
+      assert %{current_password: ["is not valid"]} = errors_on(changeset)
+    end
+
+    test "applies the e-mail without persisting it", %{user: user} do
+      email = unique_user_email()
+      {:ok, user} = Accounts.apply_user_email(user, valid_user_password(), %{email: email})
+      assert user.email == email
+      assert Accounts.get_user!(user.id).email != email
+    end
+  end
+
+  describe "deliver_update_email_instructions/3" do
+    setup do
+      %{user: user_fixture()}
+    end
+
+    test "sends token through notification", %{user: user} do
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_update_email_instructions(user, "current@example.com", url)
+        end)
+
+      {:ok, token} = Base.url_decode64(token, padding: false)
+      assert user_token = Repo.get_by(UserToken, token: :crypto.hash(:sha256, token))
+      assert user_token.user_id == user.id
+      assert user_token.sent_to == user.email
+      assert user_token.context == "change:current@example.com"
+    end
+  end
+
+  describe "update_user_email/2" do
+    setup do
+      user = user_fixture()
+      email = unique_user_email()
+
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_update_email_instructions(%{user | email: email}, user.email, url)
+        end)
+
+      %{user: user, token: token, email: email}
+    end
+
+    test "updates the e-mail with a valid token", %{user: user, token: token, email: email} do
+      assert Accounts.update_user_email(user, token) == :ok
+      changed_user = Repo.get!(User, user.id)
+      assert changed_user.email != user.email
+      assert changed_user.email == email
+      assert changed_user.confirmed_at
+      assert changed_user.confirmed_at != user.confirmed_at
+      refute Repo.get_by(UserToken, user_id: user.id)
+    end
+
+    test "does not update e-mail with invalid token", %{user: user} do
+      assert Accounts.update_user_email(user, "oops") == :error
+      assert Repo.get!(User, user.id).email == user.email
+      assert Repo.get_by(UserToken, user_id: user.id)
+    end
+
+    test "does not update e-mail if user e-mail changed", %{user: user, token: token} do
+      assert Accounts.update_user_email(%{user | email: "current@example.com"}, token) == :error
+      assert Repo.get!(User, user.id).email == user.email
+      assert Repo.get_by(UserToken, user_id: user.id)
+    end
+
+    test "does not update e-mail if token expired", %{user: user, token: token} do
+      {1, nil} = Repo.update_all(UserToken, set: [inserted_at: ~N[2020-01-01 00:00:00]])
+      assert Accounts.update_user_email(user, token) == :error
+      assert Repo.get!(User, user.id).email == user.email
+      assert Repo.get_by(UserToken, user_id: user.id)
+    end
+  end
+
+  describe "change_user_password/2" do
+    test "returns a user changeset" do
+      assert %Ecto.Changeset{} = changeset = Accounts.change_user_password(%User{})
+      assert changeset.required == [:password]
+    end
+  end
+
+  describe "update_user_password/3" do
+    setup do
+      %{user: user_fixture()}
+    end
+
+    test "validates password", %{user: user} do
+      {:error, changeset} =
+        Accounts.update_user_password(user, valid_user_password(), %{
+          password: "not valid",
+          password_confirmation: "another"
+        })
+
+      assert %{
+               password: ["should be at least 12 character(s)"],
+               password_confirmation: ["does not match password"]
+             } = errors_on(changeset)
+    end
+
+    test "validates maximum values for password for security", %{user: user} do
+      too_long = String.duplicate("db", 100)
+
+      {:error, changeset} =
+        Accounts.update_user_password(user, valid_user_password(), %{password: too_long})
+
+      assert "should be at most 80 character(s)" in errors_on(changeset).password
+    end
+
+    test "validates current password", %{user: user} do
+      {:error, changeset} =
+        Accounts.update_user_password(user, "invalid", %{password: valid_user_password()})
+
+      assert %{current_password: ["is not valid"]} = errors_on(changeset)
+    end
+
+    test "updates the password", %{user: user} do
+      {:ok, user} =
+        Accounts.update_user_password(user, valid_user_password(), %{
+          password: "new valid password"
+        })
+
+      assert is_nil(user.password)
+      assert Accounts.get_user_by_email_and_password(user.email, "new valid password")
+    end
+
+    test "deletes all tokens for the given user", %{user: user} do
+      _ = Accounts.generate_user_session_token(user)
+
+      {:ok, _} =
+        Accounts.update_user_password(user, valid_user_password(), %{
+          password: "new valid password"
+        })
+
+      refute Repo.get_by(UserToken, user_id: user.id)
+    end
+  end
+
+  describe "generate_user_session_token/1" do
+    setup do
+      %{user: user_fixture()}
+    end
+
+    test "generates a token", %{user: user} do
+      token = Accounts.generate_user_session_token(user)
+      assert user_token = Repo.get_by(UserToken, token: token)
+      assert user_token.context == "session"
+
+      # Creating the same token for another user should fail
+      assert_raise Ecto.ConstraintError, fn ->
+        Repo.insert!(%UserToken{
+          token: user_token.token,
+          user_id: user_fixture().id,
+          context: "session"
+        })
+      end
+    end
+  end
+
+  describe "get_user_by_session_token/1" do
+    setup do
+      user = user_fixture()
+      token = Accounts.generate_user_session_token(user)
+      %{user: user, token: token}
+    end
+
+    test "returns user by token", %{user: user, token: token} do
+      assert session_user = Accounts.get_user_by_session_token(token)
+      assert session_user.id == user.id
+    end
+
+    test "does not return user for invalid token" do
+      refute Accounts.get_user_by_session_token("oops")
+    end
+
+    test "does not return user for expired token", %{token: token} do
+      {1, nil} = Repo.update_all(UserToken, set: [inserted_at: ~N[2020-01-01 00:00:00]])
+      refute Accounts.get_user_by_session_token(token)
+    end
+  end
+
+  describe "delete_session_token/1" do
+    test "deletes the token" do
+      user = user_fixture()
+      token = Accounts.generate_user_session_token(user)
+      assert Accounts.delete_session_token(token) == :ok
+      refute Accounts.get_user_by_session_token(token)
+    end
+  end
+
+  describe "deliver_user_confirmation_instructions/2" do
+    setup do
+      %{user: user_fixture()}
+    end
+
+    test "sends token through notification", %{user: user} do
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_user_confirmation_instructions(user, url)
+        end)
+
+      {:ok, token} = Base.url_decode64(token, padding: false)
+      assert user_token = Repo.get_by(UserToken, token: :crypto.hash(:sha256, token))
+      assert user_token.user_id == user.id
+      assert user_token.sent_to == user.email
+      assert user_token.context == "confirm"
+    end
+  end
+
+  describe "confirm_user/2" do
+    setup do
+      user = user_fixture()
+
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_user_confirmation_instructions(user, url)
+        end)
+
+      %{user: user, token: token}
+    end
+
+    test "confirms the e-mail with a valid token", %{user: user, token: token} do
+      assert {:ok, confirmed_user} = Accounts.confirm_user(token)
+      assert confirmed_user.confirmed_at
+      assert confirmed_user.confirmed_at != user.confirmed_at
+      assert Repo.get!(User, user.id).confirmed_at
+      refute Repo.get_by(UserToken, user_id: user.id)
+    end
+
+    test "does not confirm with invalid token", %{user: user} do
+      assert Accounts.confirm_user("oops") == :error
+      refute Repo.get!(User, user.id).confirmed_at
+      assert Repo.get_by(UserToken, user_id: user.id)
+    end
+
+    test "does not confirm e-mail if token expired", %{user: user, token: token} do
+      {1, nil} = Repo.update_all(UserToken, set: [inserted_at: ~N[2020-01-01 00:00:00]])
+      assert Accounts.confirm_user(token) == :error
+      refute Repo.get!(User, user.id).confirmed_at
+      assert Repo.get_by(UserToken, user_id: user.id)
+    end
+  end
+
+  describe "deliver_user_reset_password_instructions/2" do
+    setup do
+      %{user: user_fixture()}
+    end
+
+    test "sends token through notification", %{user: user} do
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_user_reset_password_instructions(user, url)
+        end)
+
+      {:ok, token} = Base.url_decode64(token, padding: false)
+      assert user_token = Repo.get_by(UserToken, token: :crypto.hash(:sha256, token))
+      assert user_token.user_id == user.id
+      assert user_token.sent_to == user.email
+      assert user_token.context == "reset_password"
+    end
+  end
+
+  describe "get_user_by_reset_password_token/2" do
+    setup do
+      user = user_fixture()
+
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_user_reset_password_instructions(user, url)
+        end)
+
+      %{user: user, token: token}
+    end
+
+    test "returns the user with valid token", %{user: %{id: id}, token: token} do
+      assert %User{id: ^id} = Accounts.get_user_by_reset_password_token(token)
+      assert Repo.get_by(UserToken, user_id: id)
+    end
+
+    test "does not return the user with invalid token", %{user: user} do
+      refute Accounts.get_user_by_reset_password_token("oops")
+      assert Repo.get_by(UserToken, user_id: user.id)
+    end
+
+    test "does not return the user if token expired", %{user: user, token: token} do
+      {1, nil} = Repo.update_all(UserToken, set: [inserted_at: ~N[2020-01-01 00:00:00]])
+      refute Accounts.get_user_by_reset_password_token(token)
+      assert Repo.get_by(UserToken, user_id: user.id)
+    end
+  end
+
+  describe "reset_user_password/3" do
+    setup do
+      %{user: user_fixture()}
+    end
+
+    test "validates password", %{user: user} do
+      {:error, changeset} =
+        Accounts.reset_user_password(user, %{
+          password: "not valid",
+          password_confirmation: "another"
+        })
+
+      assert %{
+               password: ["should be at least 12 character(s)"],
+               password_confirmation: ["does not match password"]
+             } = errors_on(changeset)
+    end
+
+    test "validates maximum values for password for security", %{user: user} do
+      too_long = String.duplicate("db", 100)
+      {:error, changeset} = Accounts.reset_user_password(user, %{password: too_long})
+      assert "should be at most 80 character(s)" in errors_on(changeset).password
+    end
+
+    test "updates the password", %{user: user} do
+      {:ok, updated_user} = Accounts.reset_user_password(user, %{password: "new valid password"})
+      assert is_nil(updated_user.password)
+      assert Accounts.get_user_by_email_and_password(user.email, "new valid password")
+    end
+
+    test "deletes all tokens for the given user", %{user: user} do
+      _ = Accounts.generate_user_session_token(user)
+      {:ok, _} = Accounts.reset_user_password(user, %{password: "new valid password"})
+      refute Repo.get_by(UserToken, user_id: user.id)
+    end
+  end
+
+  describe "inspect/2" do
+    test "does not include password" do
+      refute inspect(%User{password: "123456"}) =~ "password: \"123456\""
+    end
+  end
+end

test/wiki/content_test.exs

@@ -0,0 +1,66 @@
+defmodule Wiki.ContentTest do
+  use Wiki.DataCase
+
+  alias Wiki.Content
+
+  describe "pages" do
+    alias Wiki.Content.Page
+
+    @valid_attrs %{content: "some content", title: "some title"}
+    @update_attrs %{content: "some updated content", title: "some updated title"}
+    @invalid_attrs %{content: nil, title: nil}
+
+    def page_fixture(attrs \\ %{}) do
+      {:ok, page} =
+        attrs
+        |> Enum.into(@valid_attrs)
+        |> Content.create_page()
+
+      page
+    end
+
+    test "list_pages/0 returns all pages" do
+      page = page_fixture()
+      assert Content.list_pages() == [page]
+    end
+
+    test "get_page!/1 returns the page with given id" do
+      page = page_fixture()
+      assert Content.get_page!(page.id) == page
+    end
+
+    test "create_page/1 with valid data creates a page" do
+      assert {:ok, %Page{} = page} = Content.create_page(@valid_attrs)
+      assert page.content == "some content"
+      assert page.title == "some title"
+    end
+
+    test "create_page/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Content.create_page(@invalid_attrs)
+    end
+
+    test "update_page/2 with valid data updates the page" do
+      page = page_fixture()
+      assert {:ok, %Page{} = page} = Content.update_page(page, @update_attrs)
+      assert page.content == "some updated content"
+      assert page.title == "some updated title"
+    end
+
+    test "update_page/2 with invalid data returns error changeset" do
+      page = page_fixture()
+      assert {:error, %Ecto.Changeset{}} = Content.update_page(page, @invalid_attrs)
+      assert page == Content.get_page!(page.id)
+    end
+
+    test "delete_page/1 deletes the page" do
+      page = page_fixture()
+      assert {:ok, %Page{}} = Content.delete_page(page)
+      assert_raise Ecto.NoResultsError, fn -> Content.get_page!(page.id) end
+    end
+
+    test "change_page/1 returns a page changeset" do
+      page = page_fixture()
+      assert %Ecto.Changeset{} = Content.change_page(page)
+    end
+  end
+end

test/wiki_web/controllers/page_controller_test.exs

@@ -0,0 +1,88 @@
+defmodule WikiWeb.PageControllerTest do
+  use WikiWeb.ConnCase
+
+  alias Wiki.Content
+
+  @create_attrs %{content: "some content", title: "some title"}
+  @update_attrs %{content: "some updated content", title: "some updated title"}
+  @invalid_attrs %{content: nil, title: nil}
+
+  def fixture(:page) do
+    {:ok, page} = Content.create_page(@create_attrs)
+    page
+  end
+
+  describe "index" do
+    test "lists all pages", %{conn: conn} do
+      conn = get(conn, Routes.page_path(conn, :index))
+      assert html_response(conn, 200) =~ "Listing Pages"
+    end
+  end
+
+  describe "new page" do
+    test "renders form", %{conn: conn} do
+      conn = get(conn, Routes.page_path(conn, :new))
+      assert html_response(conn, 200) =~ "New Page"
+    end
+  end
+
+  describe "create page" do
+    test "redirects to show when data is valid", %{conn: conn} do
+      conn = post(conn, Routes.page_path(conn, :create), page: @create_attrs)
+
+      assert %{id: id} = redirected_params(conn)
+      assert redirected_to(conn) == Routes.page_path(conn, :show, id)
+
+      conn = get(conn, Routes.page_path(conn, :show, id))
+      assert html_response(conn, 200) =~ "Show Page"
+    end
+
+    test "renders errors when data is invalid", %{conn: conn} do
+      conn = post(conn, Routes.page_path(conn, :create), page: @invalid_attrs)
+      assert html_response(conn, 200) =~ "New Page"
+    end
+  end
+
+  describe "edit page" do
+    setup [:create_page]
+
+    test "renders form for editing chosen page", %{conn: conn, page: page} do
+      conn = get(conn, Routes.page_path(conn, :edit, page))
+      assert html_response(conn, 200) =~ "Edit Page"
+    end
+  end
+
+  describe "update page" do
+    setup [:create_page]
+
+    test "redirects when data is valid", %{conn: conn, page: page} do
+      conn = put(conn, Routes.page_path(conn, :update, page), page: @update_attrs)
+      assert redirected_to(conn) == Routes.page_path(conn, :show, page)
+
+      conn = get(conn, Routes.page_path(conn, :show, page))
+      assert html_response(conn, 200) =~ "some updated content"
+    end
+
+    test "renders errors when data is invalid", %{conn: conn, page: page} do
+      conn = put(conn, Routes.page_path(conn, :update, page), page: @invalid_attrs)
+      assert html_response(conn, 200) =~ "Edit Page"
+    end
+  end
+
+  describe "delete page" do
+    setup [:create_page]
+
+    test "deletes chosen page", %{conn: conn, page: page} do
+      conn = delete(conn, Routes.page_path(conn, :delete, page))
+      assert redirected_to(conn) == Routes.page_path(conn, :index)
+      assert_error_sent 404, fn ->
+        get(conn, Routes.page_path(conn, :show, page))
+      end
+    end
+  end
+
+  defp create_page(_) do
+    page = fixture(:page)
+    %{page: page}
+  end
+end

test/wiki_web/controllers/user_auth_test.exs

@@ -0,0 +1,163 @@
+defmodule WikiWeb.UserAuthTest do
+  use WikiWeb.ConnCase, async: true
+
+  alias Wiki.Accounts
+  alias WikiWeb.UserAuth
+  import Wiki.AccountsFixtures
+
+  setup %{conn: conn} do
+    conn =
+      conn
+      |> Map.replace!(:secret_key_base, WikiWeb.Endpoint.config(:secret_key_base))
+      |> init_test_session(%{})
+
+    %{user: user_fixture(), conn: conn}
+  end
+
+  describe "log_in_user/3" do
+    test "stores the user token in the session", %{conn: conn, user: user} do
+      conn = UserAuth.log_in_user(conn, user)
+      assert token = get_session(conn, :user_token)
+      assert get_session(conn, :live_socket_id) == "users_sessions:#{Base.url_encode64(token)}"
+      assert redirected_to(conn) == "/"
+      assert Accounts.get_user_by_session_token(token)
+    end
+
+    test "clears everything previously stored in the session", %{conn: conn, user: user} do
+      conn = conn |> put_session(:to_be_removed, "value") |> UserAuth.log_in_user(user)
+      refute get_session(conn, :to_be_removed)
+    end
+
+    test "redirects to the configured path", %{conn: conn, user: user} do
+      conn = conn |> put_session(:user_return_to, "/hello") |> UserAuth.log_in_user(user)
+      assert redirected_to(conn) == "/hello"
+    end
+
+    test "writes a cookie if remember_me is configured", %{conn: conn, user: user} do
+      conn = conn |> fetch_cookies() |> UserAuth.log_in_user(user, %{"remember_me" => "true"})
+      assert get_session(conn, :user_token) == conn.cookies["user_remember_me"]
+
+      assert %{value: signed_token, max_age: max_age} = conn.resp_cookies["user_remember_me"]
+      assert signed_token != get_session(conn, :user_token)
+      assert max_age == 5_184_000
+    end
+  end
+
+  describe "logout_user/1" do
+    test "erases session and cookies", %{conn: conn, user: user} do
+      user_token = Accounts.generate_user_session_token(user)
+
+      conn =
+        conn
+        |> put_session(:user_token, user_token)
+        |> put_req_cookie("user_remember_me", user_token)
+        |> fetch_cookies()
+        |> UserAuth.log_out_user()
+
+      refute get_session(conn, :user_token)
+      refute conn.cookies["user_remember_me"]
+      assert %{max_age: 0} = conn.resp_cookies["user_remember_me"]
+      assert redirected_to(conn) == "/"
+      refute Accounts.get_user_by_session_token(user_token)
+    end
+
+    test "broadcasts to the given live_socket_id", %{conn: conn} do
+      live_socket_id = "users_sessions:abcdef-token"
+      WikiWeb.Endpoint.subscribe(live_socket_id)
+
+      conn
+      |> put_session(:live_socket_id, live_socket_id)
+      |> UserAuth.log_out_user()
+
+      assert_receive %Phoenix.Socket.Broadcast{
+        event: "disconnect",
+        topic: "users_sessions:abcdef-token"
+      }
+    end
+
+    test "works even if user is already logged out", %{conn: conn} do
+      conn = conn |> fetch_cookies() |> UserAuth.log_out_user()
+      refute get_session(conn, :user_token)
+      assert %{max_age: 0} = conn.resp_cookies["user_remember_me"]
+      assert redirected_to(conn) == "/"
+    end
+  end
+
+  describe "fetch_current_user/2" do
+    test "authenticates user from session", %{conn: conn, user: user} do
+      user_token = Accounts.generate_user_session_token(user)
+      conn = conn |> put_session(:user_token, user_token) |> UserAuth.fetch_current_user([])
+      assert conn.assigns.current_user.id == user.id
+    end
+
+    test "authenticates user from cookies", %{conn: conn, user: user} do
+      logged_in_conn =
+        conn |> fetch_cookies() |> UserAuth.log_in_user(user, %{"remember_me" => "true"})
+
+      user_token = logged_in_conn.cookies["user_remember_me"]
+      %{value: signed_token} = logged_in_conn.resp_cookies["user_remember_me"]
+
+      conn =
+        conn
+        |> put_req_cookie("user_remember_me", signed_token)
+        |> UserAuth.fetch_current_user([])
+
+      assert get_session(conn, :user_token) == user_token
+      assert conn.assigns.current_user.id == user.id
+    end
+
+    test "does not authenticate if data is missing", %{conn: conn, user: user} do
+      _ = Accounts.generate_user_session_token(user)
+      conn = UserAuth.fetch_current_user(conn, [])
+      refute get_session(conn, :user_token)
+      refute conn.assigns.current_user
+    end
+  end
+
+  describe "redirect_if_user_is_authenticated/2" do
+    test "redirects if user is authenticated", %{conn: conn, user: user} do
+      conn = conn |> assign(:current_user, user) |> UserAuth.redirect_if_user_is_authenticated([])
+      assert conn.halted
+      assert redirected_to(conn) == "/"
+    end
+
+    test "does not redirect if user is not authenticated", %{conn: conn} do
+      conn = UserAuth.redirect_if_user_is_authenticated(conn, [])
+      refute conn.halted
+      refute conn.status
+    end
+  end
+
+  describe "require_authenticated_user/2" do
+    test "redirects if user is not authenticated", %{conn: conn} do
+      conn = conn |> fetch_flash() |> UserAuth.require_authenticated_user([])
+      assert conn.halted
+      assert redirected_to(conn) == Routes.user_session_path(conn, :new)
+      assert get_flash(conn, :error) == "You must log in to access this page."
+    end
+
+    test "stores the path to redirect to on GET", %{conn: conn} do
+      halted_conn =
+        %{conn | request_path: "/foo?bar"}
+        |> fetch_flash()
+        |> UserAuth.require_authenticated_user([])
+
+      assert halted_conn.halted
+      assert get_session(halted_conn, :user_return_to) == "/foo?bar"
+
+      halted_conn =
+        %{conn | request_path: "/foo?bar", method: "POST"}
+        |> fetch_flash()
+        |> UserAuth.require_authenticated_user([])
+
+      assert halted_conn.halted
+      refute get_session(halted_conn, :user_return_to)
+    end
+
+    test "does not redirect if user is authenticated", %{conn: conn, user: user} do
+      conn = conn |> assign(:current_user, user) |> UserAuth.require_authenticated_user([])
+      refute conn.halted
+      refute conn.status
+    end
+  end
+end

test/wiki_web/controllers/user_confirmation_controller_test.exs

@@ -0,0 +1,84 @@
+defmodule WikiWeb.UserConfirmationControllerTest do
+  use WikiWeb.ConnCase, async: true
+
+  alias Wiki.Accounts
+  alias Wiki.Repo
+  import Wiki.AccountsFixtures
+
+  setup do
+    %{user: user_fixture()}
+  end
+
+  describe "GET /users/confirm" do
+    test "renders the confirmation page", %{conn: conn} do
+      conn = get(conn, Routes.user_confirmation_path(conn, :new))
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Resend confirmation instructions</h1>"
+    end
+  end
+
+  describe "POST /users/confirm" do
+    @tag :capture_log
+    test "sends a new confirmation token", %{conn: conn, user: user} do
+      conn =
+        post(conn, Routes.user_confirmation_path(conn, :create), %{
+          "user" => %{"email" => user.email}
+        })
+
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :info) =~ "If your e-mail is in our system"
+      assert Repo.get_by!(Accounts.UserToken, user_id: user.id).context == "confirm"
+    end
+
+    test "does not send confirmation token if account is confirmed", %{conn: conn, user: user} do
+      Repo.update!(Accounts.User.confirm_changeset(user))
+
+      conn =
+        post(conn, Routes.user_confirmation_path(conn, :create), %{
+          "user" => %{"email" => user.email}
+        })
+
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :info) =~ "If your e-mail is in our system"
+      refute Repo.get_by(Accounts.UserToken, user_id: user.id)
+    end
+
+    test "does not send confirmation token if email is invalid", %{conn: conn} do
+      conn =
+        post(conn, Routes.user_confirmation_path(conn, :create), %{
+          "user" => %{"email" => "unknown@example.com"}
+        })
+
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :info) =~ "If your e-mail is in our system"
+      assert Repo.all(Accounts.UserToken) == []
+    end
+  end
+
+  describe "GET /users/confirm/:token" do
+    test "confirms the given token once", %{conn: conn, user: user} do
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_user_confirmation_instructions(user, url)
+        end)
+
+      conn = get(conn, Routes.user_confirmation_path(conn, :confirm, token))
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :info) =~ "Account confirmed successfully"
+      assert Accounts.get_user!(user.id).confirmed_at
+      refute get_session(conn, :user_token)
+      assert Repo.all(Accounts.UserToken) == []
+
+      conn = get(conn, Routes.user_confirmation_path(conn, :confirm, token))
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :error) =~ "Confirmation link is invalid or it has expired"
+    end
+
+    test "does not confirm email with invalid token", %{conn: conn, user: user} do
+      conn = get(conn, Routes.user_confirmation_path(conn, :confirm, "oops"))
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :error) =~ "Confirmation link is invalid or it has expired"
+      refute Accounts.get_user!(user.id).confirmed_at
+    end
+  end
+end

test/wiki_web/controllers/user_registration_controller_test.exs

@@ -0,0 +1,54 @@
+defmodule WikiWeb.UserRegistrationControllerTest do
+  use WikiWeb.ConnCase, async: true
+
+  import Wiki.AccountsFixtures
+
+  describe "GET /users/register" do
+    test "renders registration page", %{conn: conn} do
+      conn = get(conn, Routes.user_registration_path(conn, :new))
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Register</h1>"
+      assert response =~ "Log in</a>"
+      assert response =~ "Register</a>"
+    end
+
+    test "redirects if already logged in", %{conn: conn} do
+      conn = conn |> log_in_user(user_fixture()) |> get(Routes.user_registration_path(conn, :new))
+      assert redirected_to(conn) == "/"
+    end
+  end
+
+  describe "POST /users/register" do
+    @tag :capture_log
+    test "creates account and logs the user in", %{conn: conn} do
+      email = unique_user_email()
+
+      conn =
+        post(conn, Routes.user_registration_path(conn, :create), %{
+          "user" => %{"email" => email, "password" => valid_user_password()}
+        })
+
+      assert get_session(conn, :user_token)
+      assert redirected_to(conn) =~ "/"
+
+      # Now do a logged in request and assert on the menu
+      conn = get(conn, "/")
+      response = html_response(conn, 200)
+      assert response =~ email
+      assert response =~ "Settings</a>"
+      assert response =~ "Log out</a>"
+    end
+
+    test "render errors for invalid data", %{conn: conn} do
+      conn =
+        post(conn, Routes.user_registration_path(conn, :create), %{
+          "user" => %{"email" => "with spaces", "password" => "too short"}
+        })
+
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Register</h1>"
+      assert response =~ "must have the @ sign and no spaces"
+      assert response =~ "should be at least 12 character"
+    end
+  end
+end

test/wiki_web/controllers/user_reset_password_controller_test.exs

@@ -0,0 +1,113 @@
+defmodule WikiWeb.UserResetPasswordControllerTest do
+  use WikiWeb.ConnCase, async: true
+
+  alias Wiki.Accounts
+  alias Wiki.Repo
+  import Wiki.AccountsFixtures
+
+  setup do
+    %{user: user_fixture()}
+  end
+
+  describe "GET /users/reset_password" do
+    test "renders the reset password page", %{conn: conn} do
+      conn = get(conn, Routes.user_reset_password_path(conn, :new))
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Forgot your password?</h1>"
+    end
+  end
+
+  describe "POST /users/reset_password" do
+    @tag :capture_log
+    test "sends a new reset password token", %{conn: conn, user: user} do
+      conn =
+        post(conn, Routes.user_reset_password_path(conn, :create), %{
+          "user" => %{"email" => user.email}
+        })
+
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :info) =~ "If your e-mail is in our system"
+      assert Repo.get_by!(Accounts.UserToken, user_id: user.id).context == "reset_password"
+    end
+
+    test "does not send reset password token if email is invalid", %{conn: conn} do
+      conn =
+        post(conn, Routes.user_reset_password_path(conn, :create), %{
+          "user" => %{"email" => "unknown@example.com"}
+        })
+
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :info) =~ "If your e-mail is in our system"
+      assert Repo.all(Accounts.UserToken) == []
+    end
+  end
+
+  describe "GET /users/reset_password/:token" do
+    setup %{user: user} do
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_user_reset_password_instructions(user, url)
+        end)
+
+      %{token: token}
+    end
+
+    test "renders reset password", %{conn: conn, token: token} do
+      conn = get(conn, Routes.user_reset_password_path(conn, :edit, token))
+      assert html_response(conn, 200) =~ "<h1>Reset password</h1>"
+    end
+
+    test "does not render reset password with invalid token", %{conn: conn} do
+      conn = get(conn, Routes.user_reset_password_path(conn, :edit, "oops"))
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :error) =~ "Reset password link is invalid or it has expired"
+    end
+  end
+
+  describe "PUT /users/reset_password/:token" do
+    setup %{user: user} do
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_user_reset_password_instructions(user, url)
+        end)
+
+      %{token: token}
+    end
+
+    test "resets password once", %{conn: conn, user: user, token: token} do
+      conn =
+        put(conn, Routes.user_reset_password_path(conn, :update, token), %{
+          "user" => %{
+            "password" => "new valid password",
+            "password_confirmation" => "new valid password"
+          }
+        })
+
+      assert redirected_to(conn) == Routes.user_session_path(conn, :new)
+      refute get_session(conn, :user_token)
+      assert get_flash(conn, :info) =~ "Password reset successfully"
+      assert Accounts.get_user_by_email_and_password(user.email, "new valid password")
+    end
+
+    test "does not reset password on invalid data", %{conn: conn, token: token} do
+      conn =
+        put(conn, Routes.user_reset_password_path(conn, :update, token), %{
+          "user" => %{
+            "password" => "too short",
+            "password_confirmation" => "does not match"
+          }
+        })
+
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Reset password</h1>"
+      assert response =~ "should be at least 12 character(s)"
+      assert response =~ "does not match password"
+    end
+
+    test "does not reset password with invalid token", %{conn: conn} do
+      conn = put(conn, Routes.user_reset_password_path(conn, :update, "oops"))
+      assert redirected_to(conn) == "/"
+      assert get_flash(conn, :error) =~ "Reset password link is invalid or it has expired"
+    end
+  end
+end

test/wiki_web/controllers/user_session_controller_test.exs

@@ -0,0 +1,84 @@
+defmodule WikiWeb.UserSessionControllerTest do
+  use WikiWeb.ConnCase, async: true
+
+  import Wiki.AccountsFixtures
+
+  setup do
+    %{user: user_fixture()}
+  end
+
+  describe "GET /users/log_in" do
+    test "renders log in page", %{conn: conn} do
+      conn = get(conn, Routes.user_session_path(conn, :new))
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Log in</h1>"
+      assert response =~ "Log in</a>"
+      assert response =~ "Register</a>"
+    end
+
+    test "redirects if already logged in", %{conn: conn, user: user} do
+      conn = conn |> log_in_user(user) |> get(Routes.user_session_path(conn, :new))
+      assert redirected_to(conn) == "/"
+    end
+  end
+
+  describe "POST /users/log_in" do
+    test "logs the user in", %{conn: conn, user: user} do
+      conn =
+        post(conn, Routes.user_session_path(conn, :create), %{
+          "user" => %{"email" => user.email, "password" => valid_user_password()}
+        })
+
+      assert get_session(conn, :user_token)
+      assert redirected_to(conn) =~ "/"
+
+      # Now do a logged in request and assert on the menu
+      conn = get(conn, "/")
+      response = html_response(conn, 200)
+      assert response =~ user.email
+      assert response =~ "Settings</a>"
+      assert response =~ "Log out</a>"
+    end
+
+    test "logs the user in with remember me", %{conn: conn, user: user} do
+      conn =
+        post(conn, Routes.user_session_path(conn, :create), %{
+          "user" => %{
+            "email" => user.email,
+            "password" => valid_user_password(),
+            "remember_me" => "true"
+          }
+        })
+
+      assert conn.resp_cookies["user_remember_me"]
+      assert redirected_to(conn) =~ "/"
+    end
+
+    test "emits error message with invalid credentials", %{conn: conn, user: user} do
+      conn =
+        post(conn, Routes.user_session_path(conn, :create), %{
+          "user" => %{"email" => user.email, "password" => "invalid_password"}
+        })
+
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Log in</h1>"
+      assert response =~ "Invalid e-mail or password"
+    end
+  end
+
+  describe "DELETE /users/log_out" do
+    test "logs the user out", %{conn: conn, user: user} do
+      conn = conn |> log_in_user(user) |> delete(Routes.user_session_path(conn, :delete))
+      assert redirected_to(conn) == "/"
+      refute get_session(conn, :user_token)
+      assert get_flash(conn, :info) =~ "Logged out successfully"
+    end
+
+    test "succeeds even if the user is not logged in", %{conn: conn} do
+      conn = delete(conn, Routes.user_session_path(conn, :delete))
+      assert redirected_to(conn) == "/"
+      refute get_session(conn, :user_token)
+      assert get_flash(conn, :info) =~ "Logged out successfully"
+    end
+  end
+end

test/wiki_web/controllers/user_settings_controller_test.exs

@@ -0,0 +1,125 @@
+defmodule WikiWeb.UserSettingsControllerTest do
+  use WikiWeb.ConnCase, async: true
+
+  alias Wiki.Accounts
+  import Wiki.AccountsFixtures
+
+  setup :register_and_log_in_user
+
+  describe "GET /users/settings" do
+    test "renders settings page", %{conn: conn} do
+      conn = get(conn, Routes.user_settings_path(conn, :edit))
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Settings</h1>"
+    end
+
+    test "redirects if user is not logged in" do
+      conn = build_conn()
+      conn = get(conn, Routes.user_settings_path(conn, :edit))
+      assert redirected_to(conn) == Routes.user_session_path(conn, :new)
+    end
+  end
+
+  describe "PUT /users/settings/update_password" do
+    test "updates the user password and resets tokens", %{conn: conn, user: user} do
+      new_password_conn =
+        put(conn, Routes.user_settings_path(conn, :update_password), %{
+          "current_password" => valid_user_password(),
+          "user" => %{
+            "password" => "new valid password",
+            "password_confirmation" => "new valid password"
+          }
+        })
+
+      assert redirected_to(new_password_conn) == Routes.user_settings_path(conn, :edit)
+      assert get_session(new_password_conn, :user_token) != get_session(conn, :user_token)
+      assert get_flash(new_password_conn, :info) =~ "Password updated successfully"
+      assert Accounts.get_user_by_email_and_password(user.email, "new valid password")
+    end
+
+    test "does not update password on invalid data", %{conn: conn} do
+      old_password_conn =
+        put(conn, Routes.user_settings_path(conn, :update_password), %{
+          "current_password" => "invalid",
+          "user" => %{
+            "password" => "too short",
+            "password_confirmation" => "does not match"
+          }
+        })
+
+      response = html_response(old_password_conn, 200)
+      assert response =~ "<h1>Settings</h1>"
+      assert response =~ "should be at least 12 character(s)"
+      assert response =~ "does not match password"
+      assert response =~ "is not valid"
+
+      assert get_session(old_password_conn, :user_token) == get_session(conn, :user_token)
+    end
+  end
+
+  describe "PUT /users/settings/update_email" do
+    @tag :capture_log
+    test "updates the user email", %{conn: conn, user: user} do
+      conn =
+        put(conn, Routes.user_settings_path(conn, :update_email), %{
+          "current_password" => valid_user_password(),
+          "user" => %{"email" => unique_user_email()}
+        })
+
+      assert redirected_to(conn) == Routes.user_settings_path(conn, :edit)
+      assert get_flash(conn, :info) =~ "A link to confirm your e-mail"
+      assert Accounts.get_user_by_email(user.email)
+    end
+
+    test "does not update email on invalid data", %{conn: conn} do
+      conn =
+        put(conn, Routes.user_settings_path(conn, :update_email), %{
+          "current_password" => "invalid",
+          "user" => %{"email" => "with spaces"}
+        })
+
+      response = html_response(conn, 200)
+      assert response =~ "<h1>Settings</h1>"
+      assert response =~ "must have the @ sign and no spaces"
+      assert response =~ "is not valid"
+    end
+  end
+
+  describe "GET /users/settings/confirm_email/:token" do
+    setup %{user: user} do
+      email = unique_user_email()
+
+      token =
+        extract_user_token(fn url ->
+          Accounts.deliver_update_email_instructions(%{user | email: email}, user.email, url)
+        end)
+
+      %{token: token, email: email}
+    end
+
+    test "updates the user email once", %{conn: conn, user: user, token: token, email: email} do
+      conn = get(conn, Routes.user_settings_path(conn, :confirm_email, token))
+      assert redirected_to(conn) == Routes.user_settings_path(conn, :edit)
+      assert get_flash(conn, :info) =~ "E-mail changed successfully"
+      refute Accounts.get_user_by_email(user.email)
+      assert Accounts.get_user_by_email(email)
+
+      conn = get(conn, Routes.user_settings_path(conn, :confirm_email, token))
+      assert redirected_to(conn) == Routes.user_settings_path(conn, :edit)
+      assert get_flash(conn, :error) =~ "Email change link is invalid or it has expired"
+    end
+
+    test "does not update email with invalid token", %{conn: conn, user: user} do
+      conn = get(conn, Routes.user_settings_path(conn, :confirm_email, "oops"))
+      assert redirected_to(conn) == Routes.user_settings_path(conn, :edit)
+      assert get_flash(conn, :error) =~ "Email change link is invalid or it has expired"
+      assert Accounts.get_user_by_email(user.email)
+    end
+
+    test "redirects if user is not logged in", %{token: token} do
+      conn = build_conn()
+      conn = get(conn, Routes.user_settings_path(conn, :confirm_email, token))
+      assert redirected_to(conn) == Routes.user_session_path(conn, :new)
+    end
+  end
+end

test/wiki_web/views/error_view_test.exs

@@ -0,0 +1,14 @@
+defmodule WikiWeb.ErrorViewTest do
+  use WikiWeb.ConnCase, async: true
+
+  # Bring render/3 and render_to_string/3 for testing custom views
+  import Phoenix.View
+
+  test "renders 404.html" do
+    assert render_to_string(WikiWeb.ErrorView, "404.html", []) == "Not Found"
+  end
+
+  test "renders 500.html" do
+    assert render_to_string(WikiWeb.ErrorView, "500.html", []) == "Internal Server Error"
+  end
+end

test/wiki_web/views/layout_view_test.exs

@@ -0,0 +1,8 @@
+defmodule WikiWeb.LayoutViewTest do
+  use WikiWeb.ConnCase, async: true
+
+  # When testing helpers, you may want to import Phoenix.HTML and
+  # use functions such as safe_to_string() to convert the helper
+  # result into an HTML string.
+  # import Phoenix.HTML
+end

test/wiki_web/views/page_view_test.exs

@@ -0,0 +1,3 @@
+defmodule WikiWeb.PageViewTest do
+  use WikiWeb.ConnCase, async: true
+end