Support story link previews.

Telegram/Resources/langs/lang.strings

@@ -3702,6 +3702,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_view_button_background" = "View background";
 "lng_view_button_theme" = "View theme";
 "lng_view_button_message" = "View message";
+"lng_view_button_story" = "View story";
 "lng_view_button_voice_chat" = "Voice chat";
 "lng_view_button_voice_chat_channel" = "Live stream";
 "lng_view_button_request_join" = "Request to Join";

Telegram/SourceFiles/apiwrap.cpp

@@ -779,7 +779,7 @@ QString ApiWrap::exportDirectStoryLink(not_null<Data::Story*> story) {
 	const auto fallback = [&] {
 		const auto base = user->username();
 		const auto story = QString::number(storyId.story);
-		const auto query = base + "/s" + story;
+		const auto query = base + "/s/" + story;
 		return session().createInternalLinkFull(query);
 	};
 	const auto i = _unlikelyStoryLinks.find(storyId);

Telegram/SourceFiles/data/data_media_types.cpp

@@ -1982,11 +1982,16 @@ MediaStory::MediaStory(not_null<HistoryItem*> parent, FullStoryId storyId)
 : Media(parent)
 , _storyId(storyId) {
 	const auto stories = &parent->history()->owner().stories();
-	const auto maybeStory = stories->lookup(storyId);
-	if (!maybeStory) {
+	if (const auto maybeStory = stories->lookup(storyId)) {
+		parent->setText((*maybeStory)->caption());
+	} else {
 		if (maybeStory.error() == NoStory::Unknown) {
 			stories->resolve(storyId, crl::guard(this, [=] {
-				_expired = !stories->lookup(storyId);
+				if (const auto maybeStory = stories->lookup(storyId)) {
+					parent->setText((*maybeStory)->caption());
+				} else {
+					_expired = true;
+				}
 				parent->history()->owner().requestItemViewRefresh(parent);
 			}));
 		} else {
@@ -2052,6 +2057,7 @@ std::unique_ptr<HistoryView::Media> MediaStory::createView(
 	const auto stories = &parent()->history()->owner().stories();
 	const auto maybeStory = stories->lookup(_storyId);
 	if (!maybeStory) {
+		realParent->setText(TextWithEntities());
 		if (maybeStory.error() == Data::NoStory::Deleted) {
 			_expired = true;
 			return nullptr;
@@ -2065,6 +2071,7 @@ std::unique_ptr<HistoryView::Media> MediaStory::createView(
 	}
 	_expired = false;
 	const auto story = *maybeStory;
+	realParent->setText(story->caption());
 	if (const auto photo = story->photo()) {
 		return std::make_unique<HistoryView::Photo>(
 			message,

Telegram/SourceFiles/data/data_session.cpp

@@ -3215,6 +3215,7 @@ not_null<WebPageData*> Session::processWebpage(const MTPDwebPagePending &data) {
 		QString(),
 		QString(),
 		TextWithEntities(),
+		FullStoryId(),
 		nullptr,
 		nullptr,
 		WebPageCollage(),
@@ -3269,6 +3270,7 @@ not_null<WebPageData*> Session::webpage(
 		siteName,
 		title,
 		description,
+		FullStoryId(),
 		photo,
 		document,
 		std::move(collage),
@@ -3321,16 +3323,55 @@ void Session::webpageApplyFields(
 		}
 		return nullptr;
 	};
+	auto story = (Data::Story*)nullptr;
+	auto storyId = FullStoryId();
+	if (const auto attributes = data.vattributes()) {
+		for (const auto &attribute : attributes->v) {
+			attribute.match([&](const MTPDwebPageAttributeStory &data) {
+				storyId = FullStoryId{
+					peerFromUser(data.vuser_id()),
+					data.vid().v,
+				};
+				if (const auto embed = data.vstory()) {
+					story = stories().applyFromWebpage(
+						peerFromUser(data.vuser_id()),
+						*embed);
+				} else if (const auto maybe = stories().lookup(storyId)) {
+					story = *maybe;
+				} else if (maybe.error() == Data::NoStory::Unknown) {
+					stories().resolve(storyId, [=] {
+						if (const auto maybe = stories().lookup(storyId)) {
+							const auto story = *maybe;
+							page->document = story->document();
+							page->photo = story->photo();
+							page->description = story->caption();
+							page->type = WebPageType::Story;
+							notifyWebPageUpdateDelayed(page);
+						}
+					});
+				}
+			}, [](const auto &) {});
+		}
+	}
 	webpageApplyFields(
 		page,
-		ParseWebPageType(data),
+		(story ? WebPageType::Story : ParseWebPageType(data)),
 		qs(data.vurl()),
 		qs(data.vdisplay_url()),
 		siteName,
 		qs(data.vtitle().value_or_empty()),
-		description,
-		photo ? processPhoto(*photo).get() : nullptr,
-		document ? processDocument(*document).get() : lookupThemeDocument(),
+		(story ? story->caption() : description),
+		storyId,
+		(story
+			? story->photo()
+			: photo
+			? processPhoto(*photo).get()
+			: nullptr),
+		(story
+			? story->document()
+			: document
+			? processDocument(*document).get()
+			: lookupThemeDocument()),
 		WebPageCollage(this, data),
 		data.vduration().value_or_empty(),
 		qs(data.vauthor().value_or_empty()),
@@ -3345,6 +3386,7 @@ void Session::webpageApplyFields(
 		const QString &siteName,
 		const QString &title,
 		const TextWithEntities &description,
+		FullStoryId storyId,
 		PhotoData *photo,
 		DocumentData *document,
 		WebPageCollage &&collage,
@@ -3359,6 +3401,7 @@ void Session::webpageApplyFields(
 		siteName,
 		title,
 		description,
+		storyId,
 		photo,
 		document,
 		std::move(collage),

Telegram/SourceFiles/data/data_session.h

@@ -811,6 +811,7 @@ private:
 		const QString &siteName,
 		const QString &title,
 		const TextWithEntities &description,
+		FullStoryId storyId,
 		PhotoData *photo,
 		DocumentData *document,
 		WebPageCollage &&collage,

Telegram/SourceFiles/data/data_stories.cpp

@@ -455,6 +455,17 @@ void Stories::apply(not_null<PeerData*> peer, const MTPUserStories *data) {
 	}
 }
 
+Story *Stories::applyFromWebpage(PeerId peerId, const MTPstoryItem &story) {
+	const auto idDates = parseAndApply(
+		_owner->peer(peerId),
+		story,
+		base::unixtime::now());
+	const auto value = idDates
+		? lookup({ peerId, idDates.id })
+		: base::make_unexpected(NoStory::Deleted);
+	return value ? value->get() : nullptr;
+}
+
 void Stories::requestUserStories(not_null<UserData*> user) {
 	if (!_requestingUserStories.emplace(user).second) {
 		return;

Telegram/SourceFiles/data/data_stories.h

@@ -244,6 +244,7 @@ public:
 	void loadMore(StorySourcesList list);
 	void apply(const MTPDupdateStory &data);
 	void apply(not_null<PeerData*> peer, const MTPUserStories *data);
+	Story *applyFromWebpage(PeerId peerId, const MTPstoryItem &story);
 	void loadAround(FullStoryId id, StoriesContext context);
 
 	const StoriesSource *source(PeerId id) const;

Telegram/SourceFiles/data/data_web_page.cpp

@@ -152,6 +152,8 @@ WebPageType ParseWebPageType(
 		return WebPageType::WallPaper;
 	} else if (type == u"telegram_theme"_q) {
 		return WebPageType::Theme;
+	} else if (type == u"telegram_story"_q) {
+		return WebPageType::Story;
 	} else if (type == u"telegram_channel"_q) {
 		return WebPageType::Channel;
 	} else if (type == u"telegram_channel_request"_q) {
@@ -214,6 +216,7 @@ bool WebPageData::applyChanges(
 		const QString &newSiteName,
 		const QString &newTitle,
 		const TextWithEntities &newDescription,
+		FullStoryId newStoryId,
 		PhotoData *newPhoto,
 		DocumentData *newDocument,
 		WebPageCollage &&newCollage,
@@ -254,6 +257,7 @@ bool WebPageData::applyChanges(
 		&& siteName == resultSiteName
 		&& title == resultTitle
 		&& description.text == newDescription.text
+		&& storyId == newStoryId
 		&& photo == newPhoto
 		&& document == newDocument
 		&& collage.items == newCollage.items
@@ -271,6 +275,7 @@ bool WebPageData::applyChanges(
 	siteName = resultSiteName;
 	title = resultTitle;
 	description = newDescription;
+	storyId = newStoryId;
 	photo = newPhoto;
 	document = newDocument;
 	collage = std::move(newCollage);

Telegram/SourceFiles/data/data_web_page.h

@@ -35,6 +35,7 @@ enum class WebPageType {
 
 	WallPaper,
 	Theme,
+	Story,
 
 	Article,
 	ArticleWithIV,
@@ -70,6 +71,7 @@ struct WebPageData {
 		const QString &newSiteName,
 		const QString &newTitle,
 		const TextWithEntities &newDescription,
+		FullStoryId newStoryId,
 		PhotoData *newPhoto,
 		DocumentData *newDocument,
 		WebPageCollage &&newCollage,
@@ -89,6 +91,7 @@ struct WebPageData {
 	QString siteName;
 	QString title;
 	TextWithEntities description;
+	FullStoryId storyId;
 	int duration = 0;
 	QString author;
 	PhotoData *photo = nullptr;

Telegram/SourceFiles/history/view/history_view_view_button.cpp

@@ -52,6 +52,8 @@ inline auto WebPageToPhrase(not_null<WebPageData*> webpage) {
 	const auto type = webpage->type;
 	return Ui::Text::Upper((type == WebPageType::Theme)
 		? tr::lng_view_button_theme(tr::now)
+		: (type == WebPageType::Story)
+		? tr::lng_view_button_story(tr::now)
 		: (type == WebPageType::Message)
 		? tr::lng_view_button_message(tr::now)
 		: (type == WebPageType::Group)
@@ -139,6 +141,8 @@ bool ViewButton::MediaHasViewButton(
 		|| ((type == WebPageType::Theme)
 			&& webpage->document
 			&& webpage->document->isTheme())
+		|| ((type == WebPageType::Story)
+			&& (webpage->photo || webpage->document))
 		|| ((type == WebPageType::WallPaper)
 			&& webpage->document
 			&& webpage->document->isWallPaper());

Telegram/SourceFiles/history/view/media/history_view_web_page.cpp

@@ -168,6 +168,7 @@ QSize WebPage::countOptimalSize() {
 		&& _data->photo
 		&& _data->type != WebPageType::Photo
 		&& _data->type != WebPageType::Document
+		&& _data->type != WebPageType::Story
 		&& _data->type != WebPageType::Video) {
 		if (_data->type == WebPageType::Profile) {
 			_asArticle = true;