feat(reply_private): Enhance reply private quote

docs/capabilities.md

@@ -224,3 +224,4 @@
 * `config => feature-hints => hidden` (local) - Number of the last hint the administration has hidden via the app config
 * `config => conversations => sort-order` (local) - User selected sort order for conversations (`activity` or `alphabetical`)
 * `config => conversations => group-mode` (local) - User selected grouping mode for conversations (`none`, `group-first` or `private-first`)
+* `private-reply` - Whether clients can link the original message to a private reply in one-to-one conversations

lib/AppInfo/Application.php

@@ -20,6 +20,7 @@
 use OCA\Talk\Chat\Changelog\Listener as ChangelogListener;
 use OCA\Talk\Chat\Listener as ChatListener;
 use OCA\Talk\Chat\Parser\Changelog;
+use OCA\Talk\Chat\Parser\PrivateReply;
 use OCA\Talk\Chat\Parser\ReactionParser;
 use OCA\Talk\Chat\Parser\SystemMessage;
 use OCA\Talk\Chat\Parser\UserMention;
@@ -235,6 +236,7 @@ public function register(IRegistrationContext $context): void {
 		$context->registerEventListener(MessageParseEvent::class, Changelog::class, -75);
 		$context->registerEventListener(MessageParseEvent::class, ReactionParser::class);
 		$context->registerEventListener(MessageParseEvent::class, SystemMessage::class);
+		$context->registerEventListener(MessageParseEvent::class, PrivateReply::class);
 		$context->registerEventListener(MessageParseEvent::class, SystemMessage::class, 9999);
 		$context->registerEventListener(MessageParseEvent::class, UserMention::class, -100);
 

lib/Capabilities.php

@@ -131,6 +131,7 @@ class Capabilities implements IPublicCapability {
 		'federated-shared-items',
 		'scheduled-messages',
 		'conversation-presets',
+		'private-reply',
 	];
 
 	public const CONDITIONAL_FEATURES = [

lib/Chat/ChatManager.php

@@ -85,6 +85,7 @@ class ChatManager {
 	public const VERB_VOICE_MESSAGE = 'voice-message';
 	public const VERB_RECORD_AUDIO = 'record-audio';
 	public const VERB_RECORD_VIDEO = 'record-video';
+	public const VERB_PRIVATE_REPLY = 'private_reply';
 
 	/**
 	 * Last read message ID of -1 is set on the attendee table as default.
@@ -393,6 +394,8 @@ public function sendMessage(
 		int $threadId = 0,
 		string $threadTitle = '',
 		bool $fromScheduledMessage = false,
+		string $verb = self::VERB_MESSAGE,
+		array $extraMetaData = [],
 	): IComment {
 		if ($chat->isFederatedConversation()) {
 			$e = new MessagingNotAllowedException();
@@ -405,7 +408,7 @@ public function sendMessage(
 		$comment->setCreationDateTime($creationDateTime);
 		// A verb ('comment', 'like'...) must be provided to be able to save a
 		// comment
-		$comment->setVerb(self::VERB_MESSAGE);
+		$comment->setVerb($verb);
 
 		if ($replyTo instanceof IComment) {
 			$comment->setParentId($replyTo->getId());
@@ -443,7 +446,7 @@ public function sendMessage(
 		if ($threadId !== Thread::THREAD_NONE) {
 			$metadata[Message::METADATA_THREAD_ID] = $threadId;
 		}
-		$comment->setMetaData($metadata);
+		$comment->setMetaData(array_merge($metadata, $extraMetaData));
 
 		$event = new BeforeChatMessageSentEvent($chat, $comment, $participant, $silent, $replyTo);
 		$this->dispatcher->dispatchTyped($event);

lib/Chat/Parser/PrivateReply.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\Chat\Parser;
+
+use OCA\Talk\Chat\ChatManager;
+use OCA\Talk\Events\MessageParseEvent;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+
+/**
+ * @template-implements IEventListener<Event>
+ */
+class PrivateReply implements IEventListener {
+
+	#[\Override]
+	public function handle(Event $event): void {
+		if (!$event instanceof MessageParseEvent) {
+			return;
+		}
+
+		$message = $event->getMessage();
+
+		if ($message->getMessageType() !== ChatManager::VERB_PRIVATE_REPLY) {
+			return;
+		}
+
+		if ($message->getComment()->getParentId() === '0') {
+			$message->setVisibility(false);
+			$event->stopPropagation();
+			return;
+		}
+	}
+}

lib/Controller/ChatController.php

@@ -143,6 +143,86 @@ public function __construct(
 		parent::__construct($appName, $request);
 	}
 
+	/**
+	 * @return array{parent: IComment, parentMessage: Message}
+	 * @throws \InvalidArgumentException When a 400 should be thrown
+	 * @throws \DomainException When a 403 should be thrown
+	 */
+	private function resolveReplyTo(int $replyTo, string $replyToToken, string $actorType, string $actorId, \DateTime $creationDateTime): array {
+		$isPrivateReplyFromAnotherConvo = $replyToToken != '';
+
+		try {
+			$targetParentRoom = $isPrivateReplyFromAnotherConvo ? $this->manager->getRoomByToken($replyToToken) : $this->room;
+			$parent = $this->chatManager->getParentComment($targetParentRoom, (string)$replyTo);
+		} catch (NotFoundException $e) {
+			throw new \InvalidArgumentException('reply-to', Http::STATUS_BAD_REQUEST);
+		}
+
+		if ($isPrivateReplyFromAnotherConvo) {
+			$isOneToOneRoom = $this->room->getType() === Room::TYPE_ONE_TO_ONE;
+			if (!$isOneToOneRoom) {
+				throw new \InvalidArgumentException('reply-to', Http::STATUS_BAD_REQUEST);
+			}
+
+			$parentActorId = $parent->getActorId();
+			$parentActorType = $parent->getActorType();
+			// Validate if the members are part of the convo
+			try {
+				$this->participantService->getParticipantByActor($targetParentRoom, $actorType, $actorId);
+				$this->participantService->getParticipantByActor($targetParentRoom, $parentActorType, $parentActorId);
+			} catch (ParticipantNotFoundException $e) {
+				throw new \DomainException('reply-to', Http::STATUS_FORBIDDEN);
+			}
+
+			$originalParentMessage = $this->messageParser->createMessage($targetParentRoom, $this->participant, $parent, $this->l);
+			$this->messageParser->parseMessage($originalParentMessage);
+
+			if (!$originalParentMessage->isReplyable()) {
+				throw new \InvalidArgumentException('reply-to', Http::STATUS_BAD_REQUEST);
+			}
+
+			$originalMessageData = $originalParentMessage->toArray('json', null);
+			$originalMessageData['threadId'] = Thread::THREAD_NONE;
+			$originalMessageData['reactions'] = new \stdClass();
+			$originalMessageData['messageType'] = $originalParentMessage->getMessageType();
+
+			$extraMetaData = [
+				'replyToMessageId' => $replyTo,
+				'replyToConversationToken' => $replyToToken,
+				'replyToConversationName' => $targetParentRoom->getName(),
+				'replyToActorDisplayName' => $originalParentMessage->getActorDisplayName(),
+			];
+			$originalMessageData['metaData'] = array_merge($originalMessageData['metaData'] ?? [], $extraMetaData);
+			// Create a link message for the private reply
+			$copiedParent = $this->chatManager->sendMessage(
+				$this->room,
+				$this->participant,
+				$parentActorType,
+				$parentActorId,
+				ChatManager::VERB_PRIVATE_REPLY,
+				$creationDateTime,
+				null,
+				'',
+				true,
+				verb: ChatManager::VERB_PRIVATE_REPLY,
+				extraMetaData: [
+					'originalMessage' => $originalMessageData,
+				],
+			);
+
+			$parentMessage = $this->messageParser->createMessage($this->room, $this->participant, $copiedParent, $this->l);
+			$this->messageParser->parseMessage($parentMessage);
+		} else {
+			$parentMessage = $this->messageParser->createMessage($targetParentRoom, $this->participant, $parent, $this->l);
+			$this->messageParser->parseMessage($parentMessage);
+
+			if (!$parentMessage->isReplyable()) {
+				throw new \InvalidArgumentException('reply-to', Http::STATUS_BAD_REQUEST);
+			}
+		}
+
+		return ['parent' => $isPrivateReplyFromAnotherConvo ? $copiedParent : $parent, 'parentMessage' => $parentMessage];
+	}
 	/**
 	 * @return list{0: Attendee::ACTOR_*, 1: string}
 	 */
@@ -219,7 +299,12 @@ protected function parseCommentToResponse(IComment $comment, ?Message $parentMes
 		}
 		$data = $chatMessage->toArray($this->getResponseFormat(), $thread);
 		if ($parentMessage instanceof Message) {
-			$data['parent'] = $parentMessage->toArray($this->getResponseFormat(), $thread);
+			$parentComment = $parentMessage->getComment();
+			if ($parentComment->getVerb() === ChatManager::VERB_PRIVATE_REPLY && $parentComment->getParentId() === '0') {
+				$data['parent'] = $this->buildPrivateReplyParentSnapshot($parentComment);
+			} else {
+				$data['parent'] = $parentMessage->toArray($this->getResponseFormat(), $thread);
+			}
 		}
 
 		$headers = [];
@@ -240,13 +325,15 @@ protected function parseCommentToResponse(IComment $comment, ?Message $parentMes
 	 * @param string $referenceId for the message to be able to later identify it again
 	 * @param int $replyTo Parent id which this message is a reply to
 	 * @psalm-param non-negative-int $replyTo
+	 * @param string $replyToToken Parent token to which reply is initiated
 	 * @param bool $silent If sent silent the chat message will not create any notifications
 	 * @param string $threadTitle Only supported when not replying, when given will create a thread (requires `threads` capability)
 	 * @param int $threadId Thread id which this message is a reply to without quoting a specific message (ignored when $replyTo is given, also requires `threads` capability)
-	 * @return DataResponse<Http::STATUS_CREATED, ?TalkChatMessageWithParent, array{X-Chat-Last-Common-Read?: numeric-string}>|DataResponse<Http::STATUS_BAD_REQUEST|Http::STATUS_NOT_FOUND|Http::STATUS_REQUEST_ENTITY_TOO_LARGE|Http::STATUS_TOO_MANY_REQUESTS, array{error: string}, array{}>
+	 * @return DataResponse<Http::STATUS_CREATED, ?TalkChatMessageWithParent, array{X-Chat-Last-Common-Read?: numeric-string}>|DataResponse<Http::STATUS_BAD_REQUEST|Http::STATUS_FORBIDDEN|Http::STATUS_NOT_FOUND|Http::STATUS_REQUEST_ENTITY_TOO_LARGE|Http::STATUS_TOO_MANY_REQUESTS, array{error: string}, array{}>
 	 *
 	 * 201: Message sent successfully
 	 * 400: Sending message is not possible
+	 * 403: When trying to cross reference wrongly on a reply-private
 	 * 404: Actor not found
 	 * 413: Message too long
 	 * 429: Mention rate limit exceeded (guests only)
@@ -262,7 +349,7 @@ protected function parseCommentToResponse(IComment $comment, ?Message $parentMes
 		'apiVersion' => '(v1)',
 		'token' => '[a-z0-9]{4,30}',
 	])]
-	public function sendMessage(string $message, string $actorDisplayName = '', string $referenceId = '', int $replyTo = 0, bool $silent = false, string $threadTitle = '', int $threadId = 0): DataResponse {
+	public function sendMessage(string $message, string $actorDisplayName = '', string $referenceId = '', int $replyTo = 0, string $replyToToken = '', bool $silent = false, string $threadTitle = '', int $threadId = 0): DataResponse {
 		if ($this->room->isFederatedConversation()) {
 			/** @var \OCA\Talk\Federation\Proxy\TalkV1\Controller\ChatController $proxy */
 			$proxy = \OCP\Server::get(\OCA\Talk\Federation\Proxy\TalkV1\Controller\ChatController::class);
@@ -279,27 +366,25 @@ public function sendMessage(string $message, string $actorDisplayName = '', stri
 		}
 
 		$parent = $parentMessage = null;
+		$creationDateTime = $this->timeFactory->getDateTime('now', new \DateTimeZone('UTC'));
+
 		if ($replyTo !== 0) {
 			try {
-				$parent = $this->chatManager->getParentComment($this->room, (string)$replyTo);
-			} catch (NotFoundException $e) {
-				// Someone is trying to reply cross-rooms or to a non-existing message
-				return new DataResponse(['error' => 'reply-to'], Http::STATUS_BAD_REQUEST);
-			}
-
-			$parentMessage = $this->messageParser->createMessage($this->room, $this->participant, $parent, $this->l);
-			$this->messageParser->parseMessage($parentMessage);
-			if (!$parentMessage->isReplyable()) {
+				$resolvedReplyTo = $this->resolveReplyTo($replyTo, $replyToToken, $actorType, $actorId, $creationDateTime);
+			} catch (\InvalidArgumentException) {
 				return new DataResponse(['error' => 'reply-to'], Http::STATUS_BAD_REQUEST);
+			} catch (\DomainException) {
+				return new DataResponse(['error' => 'reply-to'], Http::STATUS_FORBIDDEN);
 			}
+			$parent = $resolvedReplyTo['parent'];
+			$parentMessage = $resolvedReplyTo['parentMessage'];
 		} elseif ($threadId !== 0) {
 			if (!$this->threadService->validateThread($this->room->getId(), $threadId)) {
 				return new DataResponse(['error' => 'reply-to'], Http::STATUS_BAD_REQUEST);
 			}
 		}
 
 		$this->participantService->ensureOneToOneRoomIsFilled($this->room);
-		$creationDateTime = $this->timeFactory->getDateTime('now', new \DateTimeZone('UTC'));
 
 		try {
 			$createThread = $replyTo === 0 && $threadId === Thread::THREAD_NONE && $threadTitle !== '';
@@ -398,10 +483,11 @@ public function getScheduledMessages(): DataResponse {
 	 * @param bool $silent If sent silent the scheduled message will not create any notifications when sent
 	 * @param string $threadTitle Only supported when not replying, when given will create a thread (requires `threads` capability)
 	 * @param int $threadId Thread id without quoting a specific message (requires `threads` capability)
-	 * @return DataResponse<Http::STATUS_CREATED, TalkScheduledMessage, array{}>|DataResponse<Http::STATUS_BAD_REQUEST, array{error: 'message'|'reply-to'|'send-at'}, array{}>|DataResponse<Http::STATUS_REQUEST_ENTITY_TOO_LARGE, array{error: 'message'}, array{}>|DataResponse<Http::STATUS_NOT_FOUND, array{error: 'actor'}, array{}>
+	 * @return DataResponse<Http::STATUS_CREATED, TalkScheduledMessage, array{}>|DataResponse<Http::STATUS_BAD_REQUEST, array{error: 'message'|'reply-to'|'send-at'}, array{}>|DataResponse<Http::STATUS_FORBIDDEN, array{error: 'reply-to'}, array{}>|DataResponse<Http::STATUS_REQUEST_ENTITY_TOO_LARGE, array{error: 'message'}, array{}>|DataResponse<Http::STATUS_NOT_FOUND, array{error: 'actor'}, array{}>
 	 *
 	 * 201: Message scheduled successfully
 	 * 400: Scheduling the message is not possible
+	 * 403: When trying to cross reference wrongly on a reply-private
 	 * 404: Actor not found
 	 * 413: Message too long
 	 */
@@ -435,19 +521,19 @@ public function scheduleMessage(
 		}
 
 		$parent = $parentMessage = null;
+		$creationDateTime = $this->timeFactory->getDateTime('now', new \DateTimeZone('UTC'));
+
 		if ($replyTo !== 0) {
+			[$actorType, $actorId] = $this->getActorInfo();
 			try {
-				$parent = $this->chatManager->getParentComment($this->room, (string)$replyTo);
-			} catch (NotFoundException $e) {
-				// Someone is trying to reply cross-rooms or to a non-existing message
-				return new DataResponse(['error' => 'reply-to'], Http::STATUS_BAD_REQUEST);
-			}
-
-			$parentMessage = $this->messageParser->createMessage($this->room, $this->participant, $parent, $this->l);
-			$this->messageParser->parseMessage($parentMessage);
-			if (!$parentMessage->isReplyable()) {
+				$resolvedReplyTo = $this->resolveReplyTo($replyTo, '', $actorType, $actorId, $creationDateTime);
+			} catch (\InvalidArgumentException) {
 				return new DataResponse(['error' => 'reply-to'], Http::STATUS_BAD_REQUEST);
+			} catch (\DomainException) {
+				return new DataResponse(['error' => 'reply-to'], Http::STATUS_FORBIDDEN);
 			}
+			$parent = $resolvedReplyTo['parent'];
+			$parentMessage = $resolvedReplyTo['parentMessage'];
 		}
 
 		if ($threadId !== 0 && !$this->threadService->validateThread($this->room->getId(), $threadId)) {
@@ -1069,6 +1155,12 @@ protected function prepareCommentsAsDataResponse(array $comments, int $lastCommo
 						continue;
 					}
 
+					if ($comment->getVerb() === ChatManager::VERB_PRIVATE_REPLY && $comment->getParentId() === '0') {
+						$loadedParents[$parentId] = $this->buildPrivateReplyParentSnapshot($comment);
+						$messages[$commentKey]['parent'] = $loadedParents[$parentId];
+						continue;
+					}
+
 					$expireDate = $message->getComment()->getExpireDate();
 					if ($expireDate instanceof \DateTime && $expireDate < $now) {
 						$commentIdToIndex[$id] = null;
@@ -1671,6 +1763,16 @@ public function getUpcomingReminders(): DataResponse {
 		return new DataResponse($resultData, Http::STATUS_OK);
 	}
 
+	private function buildPrivateReplyParentSnapshot(IComment $comment): array {
+		$metaData = $comment->getMetaData() ?? [];
+		$message = $metaData['originalMessage'];
+		$message['id'] = (int)$comment->getId();
+		unset($metaData['originalMessage']);
+		$message['metaData'] = array_merge($metaData, $message['metaData'] ?? []);
+
+		return $message;
+	}
+
 	/**
 	 * @throws DoesNotExistException
 	 * @throws CannotReachRemoteException

lib/Model/Message.php

@@ -168,6 +168,7 @@ public function isReplyable(): bool {
 			&& $this->getMessageType() !== ChatManager::VERB_COMMAND
 			&& $this->getMessageType() !== ChatManager::VERB_MESSAGE_DELETED
 			&& $this->getMessageType() !== ChatManager::VERB_REACTION
+			&& $this->getMessageType() !== ChatManager::VERB_PRIVATE_REPLY
 			&& $this->getMessageType() !== ChatManager::VERB_REACTION_DELETED
 			&& \in_array($this->getActorType(), [
 				Attendee::ACTOR_USERS,

lib/ResponseDefinitions.php

@@ -190,6 +190,14 @@
  *     threadId?: int,
  *     // Set when a thread is created with this message. If missing, no thread creation is associated with this message
  *     threadTitle?: string,
+ *     // Set only when a message in a convo is private replied on a 1-1 room. Represents the parent message id
+ *     replyToMessageId?: int,
+ *     // Set only when a message in a convo is private replied on a 1-1 room. Represents the parent message's group conversation token.
+ *     replyToConversationToken?: string,
+ *     // Set only when a message in a convo is private replied on a 1-1 room. Represents the parent message's group conversation name
+ *     replyToConversationName?: string,
+ *     // Set only when a message in a convo is private replied on a 1-1 room. Represents the parent message's actor display name
+ *     replyToActorDisplayName?: string,
  * }
  *
  * @psalm-type TalkChatMessage = TalkBaseMessage&array{

lib/Signaling/Listener.php

@@ -535,7 +535,16 @@ protected function notifyMessageSent(AMessageSentEvent $event): void {
 		if ($parent !== null) {
 			$parentMessage = $this->messageParser->createMessage($event->getRoom(), null, $parent, $l10n);
 			$this->messageParser->parseMessage($parentMessage);
-			$data['chat']['comment']['parent'] = $parentMessage->toArray('json', $thread);
+			if ($parent->getVerb() === ChatManager::VERB_PRIVATE_REPLY && $parent->getParentId() === '0') {
+				$metaData = $parent->getMetaData() ?? [];
+				$parentSnapshot = $metaData['originalMessage'];
+				$parentSnapshot['id'] = (int)$parent->getId();
+				unset($metaData['originalMessage']);
+				$parentSnapshot['metaData'] = array_merge($metaData, $parentSnapshot['metaData'] ?? []);
+				$data['chat']['comment']['parent'] = $parentSnapshot;
+			} else {
+				$data['chat']['comment']['parent'] = $parentMessage->toArray('json', $thread);
+			}
 		}
 
 		$this->externalSignaling->sendRoomMessage($room, $data);