Implement channel ownership transfer.

Telegram/Resources/langs/lang.strings

@@ -1048,6 +1048,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_channels_too_much_public_revoke_confirm_group" = "Are you sure you want to revoke the link {link}?\n\nThe group «{group}» will become private.";
 "lng_channels_too_much_public_revoke_confirm_channel" = "Are you sure you want to revoke the link {link}?\n\nThe channel «{group}» will become private.";
 "lng_channels_too_much_public_revoke" = "Revoke";
+"lng_channels_too_much_public_other" = "Sorry, the target user has too many public groups or channels already. Please ask them to make one of their existing groups or channels private first.";
 
 "lng_group_invite_bad_link" = "This invite link is broken or has expired.";
 "lng_group_invite_join" = "Join";
@@ -1661,7 +1662,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_rights_transfer_set_password" = "Set password";
 "lng_rights_transfer_about" = "This will transfer the full **owner rights** for {group} to {user}.";
 "lng_rights_transfer_sure" = "Change owner";
-"lng_rights_transfer_password" = "Please enter your password to complete the transfer.";
+"lng_rights_transfer_password_title" = "Two-step verification";
+"lng_rights_transfer_password_description" = "Please enter your password to complete the transfer.";
 "lng_rights_transfer_done_group" = "{user} is now the owner of the group.";
 "lng_rights_transfer_done_channel" = "{user} is now the owner of the channel.";
 

Telegram/SourceFiles/boxes/passcode_box.cpp

@@ -88,12 +88,12 @@ bool PasscodeBox::currentlyHave() const {
 }
 
 bool PasscodeBox::onlyCheckCurrent() const {
-	return _turningOff || _cloudFields.customCheckedCallback;
+	return _turningOff || _cloudFields.customCheckCallback;
 }
 
 void PasscodeBox::prepare() {
 	addButton([=] {
-		return _cloudFields.button.value_or(lang(_turningOff
+		return _cloudFields.customSubmitButton.value_or(lang(_turningOff
 			? lng_passcode_remove_button
 			: lng_settings_save));
 	}, [=] { save(); });
@@ -101,7 +101,7 @@ void PasscodeBox::prepare() {
 
 	_about.setText(
 		st::passcodeTextStyle,
-		_cloudFields.description.value_or(lang(_cloudPwd
+		_cloudFields.customDescription.value_or(lang(_cloudPwd
 			? lng_cloud_password_about
 			: lng_passcode_about)));
 	_aboutHeight = _about.countHeight(st::boxWidth - st::boxPadding.left() * 1.5);
@@ -109,7 +109,7 @@ void PasscodeBox::prepare() {
 	if (onlyCheck) {
 		_oldPasscode->show();
 		setTitle([=] {
-			return _cloudFields.title.value_or(lang(_cloudPwd
+			return _cloudFields.customTitle.value_or(lang(_cloudPwd
 				? lng_cloud_password_remove
 				: lng_passcode_remove));
 		});
@@ -286,7 +286,7 @@ void PasscodeBox::setPasswordFail(const RPCError &error) {
 
 	closeReplacedBy();
 	_setRequest = 0;
-	const auto err = error.type();
+	const auto &err = error.type();
 	if (err == qstr("PASSWORD_HASH_INVALID")
 		|| err == qstr("SRP_PASSWORD_CHANGED")) {
 		if (_oldPasscode->isHidden()) {
@@ -295,7 +295,7 @@ void PasscodeBox::setPasswordFail(const RPCError &error) {
 		} else {
 			badOldPasscode();
 		}
-	} else if (error.type() == qstr("SRP_ID_INVALID")) {
+	} else if (err == qstr("SRP_ID_INVALID")) {
 		handleSrpIdInvalid();
 	//} else if (err == qstr("NEW_PASSWORD_BAD")) {
 	//} else if (err == qstr("NEW_SALT_INVALID")) {
@@ -504,7 +504,7 @@ void PasscodeBox::submitOnlyCheckCloudPassword(const QString &oldPassword) {
 		sendOnlyCheckCloudPassword(oldPassword);
 	};
 	if (_cloudFields.turningOff && _cloudFields.notEmptyPassport) {
-		Assert(!_cloudFields.customCheckedCallback);
+		Assert(!_cloudFields.customCheckCallback);
 
 		const auto box = std::make_shared<QPointer<BoxContent>>();
 		const auto confirmed = [=] {
@@ -524,8 +524,8 @@ void PasscodeBox::submitOnlyCheckCloudPassword(const QString &oldPassword) {
 
 void PasscodeBox::sendOnlyCheckCloudPassword(const QString &oldPassword) {
 	checkPassword(oldPassword, [=](const Core::CloudPasswordResult &check) {
-		if (const auto onstack = _cloudFields.customCheckedCallback) {
-			onstack(check.result);
+		if (const auto onstack = _cloudFields.customCheckCallback) {
+			onstack(check);
 		} else {
 			Assert(_cloudFields.turningOff);
 			sendClearCloudPassword(check);
@@ -588,6 +588,18 @@ void PasscodeBox::serverError() {
 	closeBox();
 }
 
+bool PasscodeBox::handleCustomCheckError(const RPCError &error) {
+	const auto &type = error.type();
+	if (MTP::isFloodError(error)
+		|| type == qstr("PASSWORD_HASH_INVALID")
+		|| type == qstr("SRP_PASSWORD_CHANGED")
+		|| type == qstr("SRP_ID_INVALID")) {
+		setPasswordFail(error);
+		return true;
+	}
+	return false;
+}
+
 void PasscodeBox::sendClearCloudPassword(
 		const Core::CloudPasswordResult &check) {
 	const auto newPasswordData = QByteArray();

Telegram/SourceFiles/boxes/passcode_box.h

@@ -37,10 +37,10 @@ public:
 		bool turningOff = false;
 
 		// Check cloud password for some action.
-		Fn<void(const MTPInputCheckPasswordSRP &)> customCheckedCallback;
-		std::optional<QString> title;
-		std::optional<QString> description;
-		std::optional<QString> button;
+		Fn<void(const Core::CloudPasswordResult &)> customCheckCallback;
+		std::optional<QString> customTitle;
+		std::optional<QString> customDescription;
+		std::optional<QString> customSubmitButton;
 	};
 	PasscodeBox(QWidget*, const CloudFields &fields);
 
@@ -48,6 +48,8 @@ public:
 	rpl::producer<> passwordReloadNeeded() const;
 	rpl::producer<> clearUnconfirmedPassword() const;
 
+	bool handleCustomCheckError(const RPCError &error);
+
 protected:
 	void prepare() override;
 	void setInnerFocus() override;

Telegram/SourceFiles/boxes/peers/edit_participant_box.cpp

@@ -21,6 +21,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "settings/settings_privacy_security.h"
 #include "boxes/calendar_box.h"
 #include "boxes/generic_box.h"
+#include "boxes/confirm_box.h"
+#include "boxes/passcode_box.h"
 #include "boxes/peers/edit_peer_permissions_box.h"
 #include "boxes/peers/edit_peer_info_box.h"
 #include "data/data_peer_values.h"
@@ -46,7 +48,6 @@ enum class PasswordErrorType {
 };
 
 void SetCloudPassword(not_null<GenericBox*> box, not_null<UserData*> user) {
-	user->session().api().reloadPasswordState();
 	user->session().api().passwordState(
 	) | rpl::start_with_next([=] {
 		using namespace Settings;
@@ -414,10 +415,12 @@ void EditAdminBox::transferOwnership() {
 	if (_checkTransferRequestId) {
 		return;
 	}
+
 	const auto channel = peer()->isChannel()
 		? peer()->asChannel()->inputChannel
 		: MTP_inputChannelEmpty();
 	const auto api = &peer()->session().api();
+	api->reloadPasswordState();
 	_checkTransferRequestId = api->request(MTPchannels_EditCreator(
 		channel,
 		MTP_inputUserEmpty(),
@@ -425,7 +428,7 @@ void EditAdminBox::transferOwnership() {
 	)).fail([=](const RPCError &error) {
 		_checkTransferRequestId = 0;
 		if (!handleTransferPasswordError(error)) {
-			requestTransferPassword();
+			transferOwnershipChecked();
 		}
 	}).send();
 }
@@ -449,7 +452,90 @@ bool EditAdminBox::handleTransferPasswordError(const RPCError &error) {
 	return true;
 }
 
-void EditAdminBox::requestTransferPassword() {
+void EditAdminBox::transferOwnershipChecked() {
+	if (const auto chat = peer()->asChatNotMigrated()) {
+		peer()->session().api().migrateChat(chat, crl::guard(this, [=](
+				not_null<ChannelData*> channel) {
+			requestTransferPassword(channel);
+		}));
+	} else if (const auto channel = peer()->asChannelOrMigrated()) {
+		requestTransferPassword(channel);
+	} else {
+		Unexpected("Peer in SaveAdminCallback.");
+	}
+
+}
+
+void EditAdminBox::requestTransferPassword(not_null<ChannelData*> channel) {
+	peer()->session().api().passwordState(
+	) | rpl::take(
+		1
+	) | rpl::start_with_next([=](const Core::CloudPasswordState &state) {
+		const auto box = std::make_shared<QPointer<PasscodeBox>>();
+		auto fields = PasscodeBox::CloudFields::From(state);
+		fields.customTitle = lang(lng_rights_transfer_password_title);
+		fields.customDescription
+			= lang(lng_rights_transfer_password_description);
+		fields.customSubmitButton = lang(lng_passcode_submit);
+		fields.customCheckCallback = crl::guard(this, [=](
+				const Core::CloudPasswordResult &result) {
+			sendTransferRequestFrom(*box, channel, result);
+		});
+		*box = getDelegate()->show(Box<PasscodeBox>(fields));
+	}, lifetime());
+}
+
+void EditAdminBox::sendTransferRequestFrom(
+		QPointer<PasscodeBox> box,
+		not_null<ChannelData*> channel,
+		const Core::CloudPasswordResult &result) {
+	const auto weak = make_weak(this);
+	channel->session().api().request(MTPchannels_EditCreator(
+		channel->inputChannel,
+		user()->inputUser,
+		result.result
+	)).done([=](const MTPUpdates &result) {
+		channel->session().api().applyUpdates(result);
+		if (weak) {
+			closeBox();
+		}
+		if (box) {
+			box->closeBox();
+		}
+	}).fail(crl::guard(this, [=](const RPCError &error) {
+		if (box && box->handleCustomCheckError(error)) {
+			return;
+		}
+
+		const auto &type = error.type();
+		const auto problem = [&] {
+			if (type == qstr("CHANNELS_ADMIN_PUBLIC_TOO_MUCH")) {
+				return lang(lng_channels_too_much_public_other);
+			} else if (type == qstr("ADMINS_TOO_MUCH")) {
+				return lang(channel->isBroadcast()
+					? lng_error_admin_limit_channel
+					: lng_error_admin_limit);
+			} else if (type == qstr("CHANNEL_INVALID")) {
+				return lang(channel->isBroadcast()
+					? lng_channel_not_accessible
+					: lng_group_not_accessible);
+			}
+			return Lang::Hard::ServerError();
+		}();
+		const auto recoverable = [&] {
+			return (type == qstr("PASSWORD_MISSING"))
+				|| (type == qstr("PASSWORD_TOO_FRESH_XXX"))
+				|| (type == qstr("SESSION_TOO_FRESH_XXX"));
+		}();
+		const auto weak = make_weak(this);
+		getDelegate()->show(Box<InformBox>(problem));
+		if (box) {
+			box->closeBox();
+		}
+		if (weak && !recoverable) {
+			closeBox();
+		}
+	})).send();
 
 }
 

Telegram/SourceFiles/boxes/peers/edit_participant_box.h

@@ -20,7 +20,12 @@ template <typename Widget>
 class SlideWrap;
 } // namespace Ui
 
+namespace Core {
+struct CloudPasswordResult;
+} // namespace Core
+
 class CalendarBox;
+class PasscodeBox;
 
 class EditParticipantBox : public BoxContent {
 public:
@@ -70,6 +75,9 @@ public:
 		_saveCallback = std::move(callback);
 	}
 
+	~EditAdminBox() {
+	}
+
 protected:
 	void prepare() override;
 
@@ -80,8 +88,13 @@ private:
 	static MTPChatAdminRights Defaults(not_null<PeerData*> peer);
 
 	void transferOwnership();
+	void transferOwnershipChecked();
 	bool handleTransferPasswordError(const RPCError &error);
-	void requestTransferPassword();
+	void requestTransferPassword(not_null<ChannelData*> channel);
+	void sendTransferRequestFrom(
+		QPointer<PasscodeBox> box,
+		not_null<ChannelData*> channel,
+		const Core::CloudPasswordResult &result);
 	bool canSave() const {
 		return !!_saveCallback;
 	}