Allow switching accounts from share sheet

Packages/ComposeUI/Sources/ComposeUI/Controllers/ComposeController.swift

@@ -13,15 +13,17 @@ import TuskerComponents
 public final class ComposeController: ViewController {
     public typealias FetchStatus = (String) -> (any StatusProtocol)?
     public typealias DisplayNameLabel = (any AccountProtocol, Font.TextStyle, CGFloat) -> AnyView
+    public typealias CurrentAccountContainerView = (AnyView) -> AnyView
     public typealias ReplyContentView = (any StatusProtocol, @escaping (CGFloat) -> Void) -> AnyView
     public typealias EmojiImageView = (Emoji) -> AnyView
     
     @Published public private(set) var draft: Draft
     @Published public var config: ComposeUIConfig
-    let mastodonController: ComposeMastodonContext
+    @Published public var mastodonController: ComposeMastodonContext
     let fetchAvatar: AvatarImageView.FetchAvatar
     let fetchStatus: FetchStatus
     let displayNameLabel: DisplayNameLabel
+    let currentAccountContainerview: CurrentAccountContainerView
     let replyContentView: ReplyContentView
     let emojiImageView: EmojiImageView
     
@@ -71,6 +73,7 @@ public final class ComposeController: ViewController {
         fetchAvatar: @escaping AvatarImageView.FetchAvatar,
         fetchStatus: @escaping FetchStatus,
         displayNameLabel: @escaping DisplayNameLabel,
+        currentAccountContainerView: @escaping CurrentAccountContainerView = { $0 },
         replyContentView: @escaping ReplyContentView,
         emojiImageView: @escaping EmojiImageView
     ) {
@@ -80,6 +83,7 @@ public final class ComposeController: ViewController {
         self.fetchAvatar = fetchAvatar
         self.fetchStatus = fetchStatus
         self.displayNameLabel = displayNameLabel
+        self.currentAccountContainerview = currentAccountContainerView
         self.replyContentView = replyContentView
         self.emojiImageView = emojiImageView
         

Packages/ComposeUI/Sources/ComposeUI/Views/CurrentAccountView.swift

@@ -14,6 +14,10 @@ struct CurrentAccountView: View {
     @EnvironmentObject private var controller: ComposeController
     
     var body: some View {
+        controller.currentAccountContainerview(AnyView(currentAccount))
+    }
+    
+    private var currentAccount: some View {
         HStack(alignment: .top) {
             AvatarImageView(
                 url: account?.avatar,

Packages/TuskerComponents/Sources/TuskerComponents/AvatarImageView.swift

@@ -29,6 +29,7 @@ public struct AvatarImageView: View {
             .frame(width: size, height: size)
             .cornerRadius(style.cornerRadiusFraction * size)
             .task {
+                image = nil
                 if let url {
                     image = await fetchAvatar(url)
                 }

Packages/UserAccounts/Sources/UserAccounts/UserAccountInfo.swift

@@ -8,7 +8,7 @@
 import Foundation
 import CryptoKit
 
-public struct UserAccountInfo: Equatable, Hashable {
+public struct UserAccountInfo: Equatable, Hashable, Identifiable {
     public let id: String
     public let instanceURL: URL
     public let clientID: String

ShareExtension/ShareHostingController.swift

@@ -24,9 +24,12 @@ class ShareHostingController: UIHostingController<ShareHostingController.View> {
     
     private let controller: ComposeController
     
+    private var mastodonContextPublisher: CurrentValueSubject<ShareMastodonContext, Never>
     private var cancellables = Set<AnyCancellable>()
     
     init(draft: Draft, mastodonContext: ShareMastodonContext) {
+        let mastodonContextPublisher = CurrentValueSubject<ShareMastodonContext, Never>(mastodonContext)
+        self.mastodonContextPublisher = mastodonContextPublisher
         controller = ComposeController(
             draft: draft,
             config: ComposeUIConfig(),
@@ -34,6 +37,7 @@ class ShareHostingController: UIHostingController<ShareHostingController.View> {
             fetchAvatar: Self.fetchAvatar,
             fetchStatus: { _ in fatalError("replies aren't allowed in share sheet") },
             displayNameLabel: { account, style, _ in AnyView(Text(account.displayName).font(.system(style))) },
+            currentAccountContainerView: { AnyView(SwitchAccountContainerView(content: $0, mastodonContextPublisher: mastodonContextPublisher)) },
             replyContentView: { _, _  in fatalError("replies aren't allowed in share sheet") },
             emojiImageView: {
                 AnyView(AsyncImage(url: URL($0.url)!) {
@@ -49,7 +53,14 @@ class ShareHostingController: UIHostingController<ShareHostingController.View> {
         
         updateConfig()
         
-        mastodonContext.$ownAccount
+        mastodonContextPublisher
+            .sink { [unowned self] in
+                self.controller.mastodonController = $0
+                self.controller.draft.accountID = $0.accountInfo!.id
+            }
+            .store(in: &cancellables)
+        mastodonContextPublisher
+            .flatMap { $0.$ownAccount }
             .sink { [unowned self] in self.controller.currentAccount = $0 }
             .store(in: &cancellables)
     }

ShareExtension/SwitchAccountContainerView.swift

@@ -0,0 +1,140 @@
+//
+//  SwitchAccountContainerView.swift
+//  ShareExtension
+//
+//  Created by Shadowfacts on 4/19/23.
+//  Copyright © 2023 Shadowfacts. All rights reserved.
+//
+
+import SwiftUI
+import UserAccounts
+import TuskerPreferences
+import Pachyderm
+import Combine
+import ComposeUI
+
+struct SwitchAccountContainerView: View {
+    let content: AnyView
+    let mastodonContextPublisher: CurrentValueSubject<ShareMastodonContext, Never>
+    
+    var accounts: [UserAccountInfo] {
+        UserAccountsManager.shared.accounts
+    }
+    
+    var body: some View {
+        if accounts.count > 1 {
+            Menu {
+                ForEach(accounts) { account in
+                    Button(action: { selectAccount(account) }) {
+                        AccountButtonLabel(account: account)
+                    }
+                }
+            } label: {
+                HStack(alignment: .center) {
+                    VStack(spacing: 2) {
+                        Image(systemName: "arrowtriangle.up.fill")
+                            .resizable()
+                            .frame(width: 10, height: 5)
+                        Image(systemName: "arrowtriangle.down.fill")
+                            .resizable()
+                            .frame(width: 10, height: 5)
+                    }
+                    .foregroundColor(.secondary)
+                    
+                    content
+                }
+            }
+        } else {
+            content
+        }
+    }
+    
+    private func selectAccount(_ account: UserAccountInfo) {
+        mastodonContextPublisher.send(ShareMastodonContext(accountInfo: account))
+    }
+}
+
+private struct AccountButtonLabel: View {
+    static let urlSession = URLSession(configuration: .ephemeral)
+    
+    let account: UserAccountInfo
+    @State private var avatarImage: Image?
+    
+    var body: some View {
+        label
+            .task {
+                await fetchAvatar()
+            }
+    }
+    
+    @ViewBuilder
+    private var label: some View {
+        // subtitles only started being supported on 16.4
+        if #available(iOS 16.4, *) {
+            Label {
+                Text(account.username)
+            } icon: {
+                avatar
+            }
+            Text(account.instanceURL.host!)
+        } else {
+            Label {
+                Text("@\(account.username)@\(account.instanceURL.host!)")
+            } icon: {
+                avatar
+            }
+        }
+    }
+    
+    @ViewBuilder
+    private var avatar: some View {
+        if let avatarImage {
+            avatarImage
+        } else {
+            avatarPlaceholder
+        }
+    }
+    
+    private var avatarPlaceholder: Image {
+        switch Preferences.shared.avatarStyle {
+        case .circle:
+            return Image(systemName: "person.crop.circle")
+        case .roundRect:
+            return Image(systemName: "person.crop.square")
+        }
+    }
+    
+    private func fetchAvatar() async {
+        let client = Client(baseURL: account.instanceURL, accessToken: account.accessToken, session: Self.urlSession)
+        let account: Account? = await withCheckedContinuation({ continuation in
+            client.run(Client.getSelfAccount()) { response in
+                switch response {
+                case .success(let account, _):
+                    continuation.resume(returning: account)
+                case .failure(_):
+                    continuation.resume(returning: nil)
+                }
+            }
+        })
+        if let account,
+           let avatarURL = account.avatar,
+           let data = try? await Self.urlSession.data(from: avatarURL).0,
+           let image = UIImage(data: data) {
+            let size = CGSize(width: 50, height: 50)
+            let renderer = UIGraphicsImageRenderer(size: size)
+            let clipped = renderer.image { context in
+                let bounds = CGRect(origin: .zero, size: size)
+                let path: UIBezierPath
+                switch Preferences.shared.avatarStyle {
+                case .circle:
+                    path = UIBezierPath(ovalIn: bounds)
+                case .roundRect:
+                    path = UIBezierPath(roundedRect: bounds, cornerRadius: 5)
+                }
+                path.addClip()
+                image.draw(in: bounds)
+            }
+            self.avatarImage = Image(uiImage: clipped)
+        }
+    }
+}

Tusker.xcodeproj/project.pbxproj

@@ -230,6 +230,7 @@
 		D6A4532C29EF665D00032932 /* UserAccounts in Frameworks */ = {isa = PBXBuildFile; productRef = D6A4532B29EF665D00032932 /* UserAccounts */; };
 		D6A4532E29EF7DDD00032932 /* ShareHostingController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A4532D29EF7DDD00032932 /* ShareHostingController.swift */; };
 		D6A4533029EF7DEE00032932 /* ShareMastodonContext.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A4532F29EF7DEE00032932 /* ShareMastodonContext.swift */; };
+		D6A4533229F0CFCA00032932 /* SwitchAccountContainerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A4533129F0CFCA00032932 /* SwitchAccountContainerView.swift */; };
 		D6A4DCCC2553667800D9DE31 /* FastAccountSwitcherViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A4DCCA2553667800D9DE31 /* FastAccountSwitcherViewController.swift */; };
 		D6A4DCCD2553667800D9DE31 /* FastAccountSwitcherViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = D6A4DCCB2553667800D9DE31 /* FastAccountSwitcherViewController.xib */; };
 		D6A4DCE525537C7A00D9DE31 /* FastSwitchingAccountView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6A4DCE425537C7A00D9DE31 /* FastSwitchingAccountView.swift */; };
@@ -622,6 +623,7 @@
 		D6A4531E29EF64BA00032932 /* ShareExtension.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = ShareExtension.entitlements; sourceTree = "<group>"; };
 		D6A4532D29EF7DDD00032932 /* ShareHostingController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareHostingController.swift; sourceTree = "<group>"; };
 		D6A4532F29EF7DEE00032932 /* ShareMastodonContext.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareMastodonContext.swift; sourceTree = "<group>"; };
+		D6A4533129F0CFCA00032932 /* SwitchAccountContainerView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SwitchAccountContainerView.swift; sourceTree = "<group>"; };
 		D6A4DCCA2553667800D9DE31 /* FastAccountSwitcherViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FastAccountSwitcherViewController.swift; sourceTree = "<group>"; };
 		D6A4DCCB2553667800D9DE31 /* FastAccountSwitcherViewController.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = FastAccountSwitcherViewController.xib; sourceTree = "<group>"; };
 		D6A4DCE425537C7A00D9DE31 /* FastSwitchingAccountView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FastSwitchingAccountView.swift; sourceTree = "<group>"; };
@@ -1308,6 +1310,7 @@
 				D6A4532F29EF7DEE00032932 /* ShareMastodonContext.swift */,
 				D6A4531529EF64BA00032932 /* ShareViewController.swift */,
 				D6A4532D29EF7DDD00032932 /* ShareHostingController.swift */,
+				D6A4533129F0CFCA00032932 /* SwitchAccountContainerView.swift */,
 				D6A4531729EF64BA00032932 /* MainInterface.storyboard */,
 				D6A4531A29EF64BA00032932 /* Info.plist */,
 			);
@@ -1925,6 +1928,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				D6A4533229F0CFCA00032932 /* SwitchAccountContainerView.swift in Sources */,
 				D6A4532E29EF7DDD00032932 /* ShareHostingController.swift in Sources */,
 				D6A4531629EF64BA00032932 /* ShareViewController.swift in Sources */,
 				D6A4533029EF7DEE00032932 /* ShareMastodonContext.swift in Sources */,