Implements attachment uploading

kordophone2/XPC/XPCClient.swift

@@ -133,10 +133,14 @@ final class XPCClient
         return results
     }
 
-    public func sendMessage(conversationId: String, message: String) async throws {
+    public func sendMessage(conversationId: String, message: String, transferGuids: Set<String>) async throws {
         var args: [String: xpc_object_t] = [:]
         args["conversation_id"] = xpcString(conversationId)
         args["text"] = xpcString(message)
+        
+        if !transferGuids.isEmpty {
+            args["attachment_guids"] = xpcStringArray(transferGuids)
+        }
 
         let req = makeRequest(method: "SendMessage", arguments: args)
         guard let reply = try await sendSync(req), xpc_get_type(reply) == XPC_TYPE_DICTIONARY else { throw Error.typeError }
@@ -150,6 +154,16 @@ final class XPCClient
         let req = makeRequest(method: "DownloadAttachment", arguments: args)
         _ = try await sendSync(req)
     }
+    
+    public func uploadAttachment(path: String) async throws -> String {
+        var args: [String: xpc_object_t] = [:]
+        args["path"] = xpcString(path)
+
+        let req = makeRequest(method: "UploadAttachment", arguments: args)
+        guard let reply = try await sendSync(req), xpc_get_type(reply) == XPC_TYPE_DICTIONARY else { throw Error.typeError }
+        guard let guid: String = reply["upload_guid"] else { throw Error.encodingError }
+        return guid
+    }
 
     public func openAttachmentFileHandle(attachmentId: String, preview: Bool) async throws -> FileHandle {
         var args: [String: xpc_object_t] = [:]
@@ -274,6 +288,15 @@ extension XPCClient
         return s.withCString { ptr in xpc_string_create(ptr) }
     }
 
+    private func xpcStringArray(_ set: Set<String>) -> xpc_object_t {
+        let array = xpc_array_create(nil, 0)
+        for str in set {
+            xpc_array_append_value(array, xpcString(str))
+        }
+        
+        return array
+    }
+
     private func sendSync(_ request: xpc_object_t) async throws -> xpc_object_t? {
         try await withCheckedThrowingContinuation { continuation in
             let conn: xpc_connection_t? = self.connectionQueue.sync { self.connection }