Implements #745, #746, #747 - Initial media uploading flows

- room composer contextual menu for selecting source
- coordinator for presenting the different sources
- system picker handling and URL passback
- file preview after selection
- feature flag

ElementX/Sources/Services/Room/RoomProxy.swift

@@ -189,15 +189,15 @@ class RoomProxy: RoomProxyProtocol {
         let transactionId = genTransactionId()
         
         return await Task.dispatch(on: userInitiatedDispatchQueue) {
-            if let eventID {
-                do {
+            do {
+                if let eventID {
                     try self.room.sendReply(msg: message, inReplyToEventId: eventID, txnId: transactionId)
-                } catch {
-                    return .failure(.failedSendingMessage)
+                } else {
+                    let messageContent = messageEventContentFromMarkdown(md: message)
+                    try self.room.send(msg: messageContent, txnId: transactionId)
                 }
-            } else {
-                let messageContent = messageEventContentFromMarkdown(md: message)
-                self.room.send(msg: messageContent, txnId: transactionId)
+            } catch {
+                return .failure(.failedSendingMessage)
             }
             return .success(())
         }
@@ -218,6 +218,10 @@ class RoomProxy: RoomProxyProtocol {
             }
         }
     }
+    
+    func sendImage(body: String, url: URL) async -> Result<Void, RoomProxyError> {
+        .failure(.failedSendingMedia)
+    }
 
     func editMessage(_ newMessage: String, original eventID: String) async -> Result<Void, RoomProxyError> {
         sendMessageBackgroundTask = backgroundTaskService.startBackgroundTask(withName: backgroundTaskName, isReusable: true)

ElementX/Sources/Services/Room/RoomProxyProtocol.swift

@@ -26,6 +26,7 @@ enum RoomProxyError: Error {
     case failedSendingReadReceipt
     case failedSendingMessage
     case failedSendingReaction
+    case failedSendingMedia
     case failedEditingMessage
     case failedRedactingEvent
     case failedReportingContent
@@ -69,6 +70,8 @@ protocol RoomProxyProtocol {
     func sendMessage(_ message: String, inReplyTo eventID: String?) async -> Result<Void, RoomProxyError>
     
     func sendReaction(_ reaction: String, to eventID: String) async -> Result<Void, RoomProxyError>
+    
+    func sendImage(body: String, url: URL) async -> Result<Void, RoomProxyError>
 
     func editMessage(_ newMessage: String, original eventID: String) async -> Result<Void, RoomProxyError>