Method exportDirectMessageLink

Telegram/SourceFiles/apiwrap.cpp:778–863

}

QString ApiWrap::exportDirectMessageLink(
		not_null<HistoryItem*> item,
		bool inRepliesContext,
		bool forceNonPublicLink,
		std::optional<TimeId> videoTimestamp) {
	Expects(item->history()->peer->isChannel());

	const auto itemId = item->fullId();
	const auto channel = item->history()->peer->asChannel();
	const auto fallback = [&] {
		auto linkChannel = channel;
		auto linkItemId = item->id;
		auto linkCommentId = MsgId();
		auto linkThreadId = MsgId();
		auto linkThreadIsTopic = false;
		if (inRepliesContext) {
			linkThreadIsTopic = item->history()->isForum();
			const auto rootId = linkThreadIsTopic
				? item->topicRootId()
				: item->replyToTop();
			if (rootId) {
				const auto root = item->history()->owner().message(
					channel->id,
					rootId);
				const auto sender = root
					? root->discussionPostOriginalSender()
					: nullptr;
				if (sender && sender->hasUsername() && !forceNonPublicLink) {
					// Comment to a public channel.
					const auto forwarded = root->Get<HistoryMessageForwarded>();
					linkItemId = forwarded->savedFromMsgId;
					if (linkItemId) {
						linkChannel = sender;
						linkCommentId = item->id;
					} else {
						linkItemId = item->id;
					}
				} else {
					// Reply in a thread, maybe comment in a private channel.
					linkThreadId = rootId;
				}
			}
		}
		const auto base = (linkChannel->hasUsername() && !forceNonPublicLink)
			? linkChannel->username()
			: "c/" + QString::number(peerToChannel(linkChannel->id).bare);
		const auto post = QString::number(linkItemId.bare);
		const auto query = base
			+ '/'
			+ (linkCommentId
				? (post + "?comment=" + QString::number(linkCommentId.bare))
				: (linkThreadId && !linkThreadIsTopic)
				? (post + "?thread=" + QString::number(linkThreadId.bare))
				: linkThreadId
				? (QString::number(linkThreadId.bare) + '/' + post)
				: post);
		return session().createInternalLinkFull(query);
	};