Wire iOS media downloads through session bridge

apps/ios/TeleTuiIOS/Sources/TeleTuiIOSCore/Bridge.swift

@@ -18,6 +18,8 @@ public protocol SessionBridge: Sendable {
     func react(chatId: Int64, messageId: Int64, reaction: String) async throws -> [Reaction]
     func pinnedMessages(chatId: Int64) async throws -> [Message]
     func copyPayload(chatId: Int64, messageId: Int64) async throws -> String
+    func downloadPhoto(fileId: Int32) async throws -> DownloadedFile
+    func downloadVoice(fileId: Int32) async throws -> DownloadedFile
 }
 
 public actor FakeSessionBridge: SessionBridge {
@@ -201,6 +203,14 @@ public actor FakeSessionBridge: SessionBridge {
         }
         return message.text
     }
+
+    public func downloadPhoto(fileId: Int32) async throws -> DownloadedFile {
+        DownloadedFile(fileId: fileId, path: "/tmp/fake-photo-\(fileId).jpg")
+    }
+
+    public func downloadVoice(fileId: Int32) async throws -> DownloadedFile {
+        DownloadedFile(fileId: fileId, path: "/tmp/fake-voice-\(fileId).ogg")
+    }
 }
 
 public enum FakeBridgeError: LocalizedError {

apps/ios/TeleTuiIOS/Sources/TeleTuiIOSCore/Models.swift

@@ -153,6 +153,16 @@ public struct Profile: Equatable, Sendable {
     }
 }
 
+public struct DownloadedFile: Equatable, Sendable {
+    public var fileId: Int32
+    public var path: String
+
+    public init(fileId: Int32, path: String) {
+        self.fileId = fileId
+        self.path = path
+    }
+}
+
 public enum SessionEvent: Equatable, Sendable {
     case authChanged(AuthState)
     case chatListChanged([ChatSummary])

apps/ios/TeleTuiIOS/Sources/TeleTuiIOSCore/UniFfiSessionBridge.swift

@@ -105,6 +105,14 @@ public actor UniFfiSessionBridge: SessionBridge {
         try handle.copyPayload(chatId: chatId, messageId: messageId)
     }
 
+    public func downloadPhoto(fileId: Int32) async throws -> DownloadedFile {
+        try Self.mapDownloadedFile(handle.downloadPhoto(fileId: fileId))
+    }
+
+    public func downloadVoice(fileId: Int32) async throws -> DownloadedFile {
+        try Self.mapDownloadedFile(handle.downloadVoice(fileId: fileId))
+    }
+
     private static func mapAuthState(_ state: IosAuthState) -> AuthState {
         switch state {
         case .waitTdlibParameters:
@@ -192,6 +200,10 @@ public actor UniFfiSessionBridge: SessionBridge {
         )
     }
 
+    private static func mapDownloadedFile(_ file: IosDownloadedFile) -> DownloadedFile {
+        DownloadedFile(fileId: file.fileId, path: file.path)
+    }
+
     private static func mapEvent(_ event: IosEvent) -> SessionEvent {
         switch event {
         case let .authChanged(state):

apps/ios/TeleTuiIOS/Sources/TeleTuiIOSSmokeTests/main.swift

@@ -100,6 +100,11 @@ struct TeleTuiIOSSmokeTests {
         await viewModel.copyPayload(for: viewModel.messages[0])
         precondition(viewModel.copiedPayload == "Edited text")
 
+        let photo = try await bridge.downloadPhoto(fileId: 100)
+        let voice = try await bridge.downloadVoice(fileId: 200)
+        precondition(photo.path == "/tmp/fake-photo-100.jpg")
+        precondition(voice.path == "/tmp/fake-voice-200.ogg")
+
         await viewModel.forward(message: viewModel.messages[0], to: 2)
         let forwarded = try await bridge.loadHistory(chatId: 2)
         precondition(forwarded.contains { $0.forwardSenderName == "Alice" && $0.text == "Edited text" })