Add Special:Thanks as a non-JS fallback

If the user has JavaScript disabled, clicking
on "thank" will send the user to Special:Thanks
with the revision id already filled in. When
submitted, the form calls the API internally
and then shows the user an error or confirmation
message.

Special:Thanks is not a listed special page
since it's mainly intended as a fallback.

The API was modified to return the user name of the
editor who is being thanked if a new notification
was created.

Bug: 49161
Change-Id: I7ba4664b92bb0da425784350487ed0e7ca352b4e

ApiThank.php

@@ -16,7 +16,7 @@ class ApiThank extends ApiBase {
 		$revision = $this->getRevisionFromParams( $params );
 
 		if ( $this->userAlreadySentThanksForRevision( $user, $revision ) ) {
-			$this->markResultSuccess();
+			$this->markResultSuccess( $revision );
 		} else {
 			$recipient = $this->getUserFromRevision( $revision );
 			$this->dieOnBadRecipient( $user, $recipient );
@@ -86,8 +86,11 @@ class ApiThank extends ApiBase {
 		return User::newFromId( $recipient );
 	}
 
-	private function markResultSuccess(){
+	private function markResultSuccess( Revision $revision ) {
-		$this->getResult()->addValue( null, 'result', array( 'success' => 1 ) );
+		$this->getResult()->addValue( null, 'result', array(
+			'success' => 1,
+			'recipient' => $revision->getUserText( Revision::FOR_PUBLIC )
+		) );
 	}
 
 	private function dieOnBadRecipient( User $agent, User $recipient ) {
@@ -119,7 +122,7 @@ class ApiThank extends ApiBase {
 		// Mark the thank in session to prevent duplicates (Bug 46690)
 		$user->getRequest()->setSessionData( "thanks-thanked-{$revision->getId()}", true );
 		// Set success message
-		$this->markResultSuccess();
+		$this->markResultSuccess( $revision );
 		// Log it if we're supposed to log it
 		if ( $wgThanksLogging ) {
 			$logEntry = new ManualLogEntry( 'thanks', 'thank' );

SpecialThanks.php

@@ -0,0 +1,111 @@
+<?php
+
+class SpecialThanks extends FormSpecialPage {
+
+	/** @var array $result */
+	protected $result;
+
+	public function __construct() {
+		parent::__construct( 'Thanks' );
+	}
+
+	/**
+	 * HTMLForm fields
+	 * @return Array
+	 */
+	protected function getFormFields() {
+		return array(
+			'revid' => array(
+				'id' => 'mw-thanks-form-revid',
+				'name' => 'revid',
+				'type' => 'int',
+				'label-message' => 'thanks-form-revid',
+				'default' => $this->getRequest()->getInt( 'revid', $this->par ) ?: '',
+			)
+		);
+	}
+
+	/**
+	 * Make it look pretty
+	 * @param HTMLForm $form
+	 */
+	protected function alterForm( HTMLForm $form ) {
+		$form->setDisplayFormat( 'vform' );
+		$form->setWrapperLegend( false );
+	}
+
+	/**
+	 * Calls the API internally
+	 * @param array $data
+	 * @return Status
+	 */
+	public function onSubmit( array $data ) {
+		if ( !isset( $data['revid'] ) ) {
+			return Status::newFatal( 'thanks-error-invalidrevision' );
+		}
+
+		$request = new DerivativeRequest(
+			$this->getRequest(),
+			array(
+				'action' => 'thank',
+				'rev' => (int)$data['revid'],
+				'source' => 'specialpage',
+				'token' => $this->getUser()->getEditToken(),
+			),
+			true // posted
+		);
+
+		$api = new ApiMain(
+			$request,
+			true // enable write mode
+		);
+
+		try {
+			$api->execute();
+		} catch ( UsageException $e ) {
+			return $this->handleErrorCodes( $e->getCodeString() );
+		}
+
+		$result = $api->getResult()->getData();
+		$this->result = $result['result'];
+		return Status::newGood();
+	}
+
+	/**
+	 * Handles error codes returned by the API
+	 * @param $code
+	 * @return Status
+	 */
+	protected function handleErrorCodes( $code ) {
+		$status = new Status;
+		switch ( $code ) {
+			case 'invalidrevision':
+			case 'ratelimited':
+				$status->fatal( "thanks-error-$code" );
+				break;
+			case 'notloggedin':
+			case 'blockedtext':
+				$status->fatal( $code );
+				break;
+			default:
+				$status->fatal( 'thanks-error-undefined' );
+		}
+		return $status;
+	}
+
+	/**
+	 * Display a message to the user
+	 */
+	public function onSuccess() {
+		$recipient = User::newFromName( $this->result['recipient'] );
+		$link = Linker::userLink( $recipient->getId(), $recipient->getName() );
+		$this->getOutput()->addHTML( $this->msg( 'thanks-thanked-notice' )
+			->rawParams( $link )
+			->params( $recipient->getName() )->parse()
+		);
+	}
+
+	public function isListed() {
+		return false;
+	}
+}

Thanks.hooks.php

@@ -66,7 +66,7 @@ class ThanksHooks {
 			'a',
 			array(
 				'class' => 'mw-thanks-thank-link',
-				'href' => '#',
+				'href' => SpecialPage::getTitleFor( 'Thanks', $rev->getId() )->getFullURL(),
 				'title' => $tooltip,
 				'data-revision-id' => $rev->getId(),
 			),

Thanks.i18n.php

@@ -23,6 +23,9 @@ $messages['en'] = array(
 	'thanks-thank-tooltip' => '{{GENDER:$1|Send}} a thank you notification to this {{GENDER:$2|user}}',
 	'thanks-confirmation' => 'Do you want to {{GENDER:$1|thank}} $2 for this edit?',
 	'thanks-thanked-notice' => '$1 was notified that you liked {{GENDER:$2|his|her|their}} edit.',
+	'thanks' => 'Send thanks',
+	'thanks-form-revid' => 'Revision ID for edit',
+	'thanks-already-thanked' => '{{GENDER:$1|You}} have already sent thanks for this edit.',
 	'echo-pref-subscription-edit-thank' => 'Thanks me for my edit',
 	'echo-pref-tooltip-edit-thank' => 'Notify me when someone thanks me for an edit I made.',
 	'echo-category-title-edit-thank' => 'Thanks',
@@ -86,6 +89,9 @@ Pop-up message that is displayed after a user has thanked another user for their
 Parameters:
 * $1 - the username of the user that was thanked
 * $2 - the gender of the user that was thanked',
+	'thanks' => '{{doc-special|Thanks}}',
+	'thanks-form-revid' => 'Label for form field where the user inputs the revision id',
+	'thanks-already-thanked' => 'Message shown to user if they have already sent thanks for this edit. $1 is the user\'s username.',
 	'echo-pref-subscription-edit-thank' => 'Option for getting notifications when someone thanks the user for their edit.
 
 This is the conclusion of the sentence begun by the header: {{msg-mw|Prefs-echosubscriptions}}.',

Thanks.php

@@ -45,11 +45,15 @@ $wgAutoloadClasses['ThanksHooks'] = $dir . '/Thanks.hooks.php';
 $wgAutoloadClasses['EchoThanksFormatter'] = $dir . '/ThanksFormatter.php';
 $wgAutoloadClasses['ApiThank'] = $dir . '/ApiThank.php';
 $wgAutoloadClasses['ThanksLogFormatter'] = $dir . '/ThanksLogFormatter.php';
+$wgAutoloadClasses['SpecialThanks'] = $dir . '/SpecialThanks.php';
 $wgExtensionMessagesFiles['Thanks'] = $dir . '/Thanks.i18n.php';
 
 // Register APIs
 $wgAPIModules['thank'] = 'ApiThank';
 
+// Register special page
+$wgSpecialPages['Thanks'] = 'SpecialThanks';
+
 // Register hooks
 $wgHooks['HistoryRevisionTools'][] = 'ThanksHooks::insertThankLink';
 $wgHooks['DiffRevisionTools'][] = 'ThanksHooks::insertThankLink';

tests/ApiThankTest.php

@@ -59,7 +59,12 @@ class ApiThankTest extends \ApiTestCase {
 	}
 
 	protected function assertSuccess( $result ){
-		$this->assertEquals( array( 'result' => array( 'success' => 1 ) ), $result );
+		$this->assertEquals( array(
+			'result' => array(
+				'success' => 1,
+				'recipient' => self::$users['uploader']->username,
+			),
+		), $result );
 	}
 
 	public function testInvalidRequest(){