Improve error reporting for onboarding, use async/await
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@ -67,28 +67,41 @@ class MastodonController: ObservableObject {
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return client.run(request, completion: completion)
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}
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func registerApp(completion: @escaping (_ clientID: String, _ clientSecret: String) -> Void) {
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guard client.clientID == nil,
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client.clientSecret == nil else {
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completion(client.clientID!, client.clientSecret!)
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return
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}
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client.registerApp(name: "Tusker", redirectURI: "tusker://oauth", scopes: [.read, .write, .follow]) { response in
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guard case let .success(app, _) = response else { fatalError() }
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/// - Returns: A tuple of client ID and client secret.
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func registerApp() async throws -> (String, String) {
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if let clientID = client.clientID,
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let clientSecret = client.clientSecret {
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return (clientID, clientSecret)
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} else {
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let app: RegisteredApplication = try await withCheckedThrowingContinuation({ continuation in
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client.registerApp(name: "Tusker", redirectURI: "tusker://oauth", scopes: [.read, .write, .follow]) { response in
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switch response {
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case .failure(let error):
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continuation.resume(throwing: error)
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case .success(let app, _):
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continuation.resume(returning: app)
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}
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}
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})
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self.client.clientID = app.clientID
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self.client.clientSecret = app.clientSecret
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completion(app.clientID, app.clientSecret)
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return (app.clientID, app.clientSecret)
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}
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}
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func authorize(authorizationCode: String, completion: @escaping (_ accessToken: String) -> Void) {
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client.getAccessToken(authorizationCode: authorizationCode, redirectURI: "tusker://oauth") { response in
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guard case let .success(settings, _) = response else { fatalError() }
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self.client.accessToken = settings.accessToken
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completion(settings.accessToken)
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}
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/// - Returns: The access token
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func authorize(authorizationCode: String) async throws -> String {
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return try await withCheckedThrowingContinuation({ continuation in
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client.getAccessToken(authorizationCode: authorizationCode, redirectURI: "tusker://oauth") { response in
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switch response {
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case .failure(let error):
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continuation.resume(throwing: error)
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case .success(let settings, _):
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self.client.accessToken = settings.accessToken
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continuation.resume(returning: settings.accessToken)
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}
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}
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})
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}
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func getOwnAccount(completion: ((Result<Account, Client.Error>) -> Void)? = nil) {
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@ -120,6 +133,18 @@ class MastodonController: ObservableObject {
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}
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}
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func getOwnAccount() async throws -> Account {
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if let account = account {
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return account
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} else {
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return try await withCheckedThrowingContinuation({ continuation in
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self.getOwnAccount { result in
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continuation.resume(with: result)
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}
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})
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}
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}
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func getOwnInstance(completion: ((Instance) -> Void)? = nil) {
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getOwnInstanceInternal(retryAttempt: 0, completion: completion)
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}
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@ -8,8 +8,10 @@
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import UIKit
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import AuthenticationServices
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import Pachyderm
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protocol OnboardingViewControllerDelegate {
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@MainActor
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func didFinishOnboarding(account: LocalData.UserAccountInfo)
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}
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@ -41,59 +43,109 @@ class OnboardingViewController: UINavigationController {
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instanceSelector.delegate = self
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}
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@MainActor
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private func tryLoginTo(instanceURL: URL) async throws {
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let mastodonController = MastodonController(instanceURL: instanceURL)
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let clientID: String
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let clientSecret: String
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do {
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(clientID, clientSecret) = try await mastodonController.registerApp()
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} catch {
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throw Error.registeringApp(error)
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}
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let authCode = try await getAuthorizationCode(instanceURL: instanceURL, clientID: clientID)
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let accessToken: String
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do {
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accessToken = try await mastodonController.authorize(authorizationCode: authCode)
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} catch {
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throw Error.gettingAccessToken(error)
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}
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// construct a temporary UserAccountInfo instance for the MastodonController to use to fetch its own account
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let tempAccountInfo = LocalData.UserAccountInfo(id: "temp", instanceURL: instanceURL, clientID: clientID, clientSecret: clientSecret, username: nil, accessToken: accessToken)
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mastodonController.accountInfo = tempAccountInfo
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let ownAccount: Account
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do {
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ownAccount = try await mastodonController.getOwnAccount()
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} catch {
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throw Error.gettingOwnAccount(error)
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}
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let accountInfo = LocalData.shared.addAccount(instanceURL: instanceURL, clientID: clientID, clientSecret: clientSecret, username: ownAccount.username, accessToken: accessToken)
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mastodonController.accountInfo = accountInfo
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self.onboardingDelegate?.didFinishOnboarding(account: accountInfo)
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}
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@MainActor
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private func getAuthorizationCode(instanceURL: URL, clientID: String) async throws -> String {
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var components = URLComponents(url: instanceURL, resolvingAgainstBaseURL: false)!
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components.path = "/oauth/authorize"
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components.queryItems = [
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URLQueryItem(name: "client_id", value: clientID),
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URLQueryItem(name: "response_type", value: "code"),
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URLQueryItem(name: "scope", value: "read write follow"),
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URLQueryItem(name: "redirect_uri", value: "tusker://oauth")
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]
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let authorizeURL = components.url!
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return try await withCheckedThrowingContinuation({ continuation in
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self.authenticationSession = ASWebAuthenticationSession(url: authorizeURL, callbackURLScheme: "tusker", completionHandler: { url, error in
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if let error = error {
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continuation.resume(throwing: Error.authenticationSessionError(error))
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} else if let url = url,
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let components = URLComponents(url: url, resolvingAgainstBaseURL: true),
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let item = components.queryItems?.first(where: { $0.name == "code" }),
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let code = item.value {
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continuation.resume(returning: code)
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} else {
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continuation.resume(throwing: Error.noAuthorizationCode)
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}
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})
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// Prefer ephemeral sessions to make it easier to sign into multiple accounts on the same instance.
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self.authenticationSession!.prefersEphemeralWebBrowserSession = true
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self.authenticationSession!.presentationContextProvider = self
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self.authenticationSession!.start()
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})
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}
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}
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extension OnboardingViewController {
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enum Error: Swift.Error {
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case registeringApp(Swift.Error)
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case authenticationSessionError(Swift.Error)
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case noAuthorizationCode
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case gettingAccessToken(Swift.Error)
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case gettingOwnAccount(Swift.Error)
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var localizedDescription: String {
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switch self {
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case .registeringApp(let error):
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return "Couldn't register app: \(error)"
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case .authenticationSessionError(let error):
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return error.localizedDescription
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case .noAuthorizationCode:
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return "No authorization code"
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case .gettingAccessToken(let error):
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return "Couldn't get access token: \(error)"
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case .gettingOwnAccount(let error):
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return "Couldn't fetch account: \(error)"
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}
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}
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}
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}
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extension OnboardingViewController: InstanceSelectorTableViewControllerDelegate {
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func didSelectInstance(url instanceURL: URL) {
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let mastodonController = MastodonController(instanceURL: instanceURL)
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mastodonController.registerApp { (clientID, clientSecret) in
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var components = URLComponents(url: instanceURL, resolvingAgainstBaseURL: false)!
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components.path = "/oauth/authorize"
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components.queryItems = [
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URLQueryItem(name: "client_id", value: clientID),
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URLQueryItem(name: "response_type", value: "code"),
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URLQueryItem(name: "scope", value: "read write follow"),
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URLQueryItem(name: "redirect_uri", value: "tusker://oauth")
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]
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let authorizeURL = components.url!
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self.authenticationSession = ASWebAuthenticationSession(url: authorizeURL, callbackURLScheme: "tusker") { url, error in
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guard error == nil,
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let url = url,
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let components = URLComponents(url: url, resolvingAgainstBaseURL: true),
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let item = components.queryItems?.first(where: { $0.name == "code" }),
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let authCode = item.value else { return }
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mastodonController.authorize(authorizationCode: authCode) { (accessToken) in
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// construct a temporary UserAccountInfo instance for the MastodonController to use to fetch it's own account
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let tempAccountInfo = LocalData.UserAccountInfo(id: "temp", instanceURL: instanceURL, clientID: clientID, clientSecret: clientSecret, username: nil, accessToken: accessToken)
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mastodonController.accountInfo = tempAccountInfo
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mastodonController.getOwnAccount { (result) in
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DispatchQueue.main.async {
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switch result {
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case let .failure(error):
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let alert = UIAlertController(title: "Unable to Verify Credentials", message: "Your account could not be fetched at this time: \(error.localizedDescription)", preferredStyle: .alert)
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alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
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self.present(alert, animated: true)
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case let .success(account):
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// this needs to happen on the main thread because it publishes a new value for the ObservableObject
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let accountInfo = LocalData.shared.addAccount(instanceURL: instanceURL, clientID: clientID, clientSecret: clientSecret, username: account.username, accessToken: accessToken)
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mastodonController.accountInfo = accountInfo
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self.onboardingDelegate?.didFinishOnboarding(account: accountInfo)
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}
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}
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}
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}
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}
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DispatchQueue.main.async {
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// Prefer ephemeral sessions to make it easier to sign into multiple accounts on the same instance.
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self.authenticationSession!.prefersEphemeralWebBrowserSession = true
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self.authenticationSession!.presentationContextProvider = self
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self.authenticationSession!.start()
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Task {
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do {
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try await self.tryLoginTo(instanceURL: instanceURL)
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} catch let error as Error {
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let alert = UIAlertController(title: "Error Logging In", message: error.localizedDescription, preferredStyle: .alert)
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alert.addAction(UIAlertAction(title: "Ok", style: .default))
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self.present(alert, animated: true)
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}
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}
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}
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