-$wgExtensionFunctions[] = 'efFancyCaptcha';
-
-function efFancyCaptcha() {
- global $wgMessageCache;
- require_once( dirname( __FILE__ ) . '/FancyCaptcha.i18n.php' );
- foreach( efFancyCaptchaMessages() as $lang => $messages )
- $wgMessageCache->addMessages( $messages, $lang );
-}
-
-class FancyCaptcha extends SimpleCaptcha {
- /**
- * Check if the submitted form matches the captcha session data provided
- * by the plugin when the form was generated.
- *
- * @param WebRequest $request
- * @param array $info
- * @return bool
- */
- function keyMatch( $request, $info ) {
- global $wgCaptchaSecret;
-
- $answer = $request->getVal( 'wpCaptchaWord' );
- $digest = $wgCaptchaSecret . $info['salt'] . $answer . $wgCaptchaSecret . $info['salt'];
- $answerHash = substr( md5( $digest ), 0, 16 );
-
- if( $answerHash == $info['hash'] ) {
- wfDebug( "FancyCaptcha: answer hash matches expected {$info['hash']}\n" );
- return true;
- } else {
- wfDebug( "FancyCaptcha: answer hashes to $answerHash, expected {$info['hash']}\n" );
- return false;
- }
- }
-
- /**
- * Insert the captcha prompt into the edit form.
- */
- function getForm() {
- $info = $this->pickImage();
- if( !$info ) {
- die( "out of captcha images; this shouldn't happen" );
- }
-
- // Generate a random key for use of this captcha image in this session.
- // This is needed so multiple edits in separate tabs or windows can
- // go through without extra pain.
- $index = $this->storeCaptcha( $info );
-
- wfDebug( "Captcha id $index using hash ${info['hash']}, salt ${info['salt']}.\n" );
-
- $title = Title::makeTitle( NS_SPECIAL, 'Captcha/image' );
-
- return "<p>" .
- wfElement( 'img', array(
- 'src' => $title->getLocalUrl( 'wpCaptchaId=' . urlencode( $index ) ),
- 'width' => $info['width'],
- 'height' => $info['height'],
- 'alt' => '' ) ) .
- "</p>\n" .
- wfElement( 'input', array(
- 'type' => 'hidden',
- 'name' => 'wpCaptchaId',
- 'id' => 'wpCaptchaId',
- 'value' => $index ) ) .
- "<p>" .
- wfElement( 'input', array(
- 'name' => 'wpCaptchaWord',
- 'id' => 'wpCaptchaWord',
- 'tabindex' => 1 ) ) . // tab in before the edit textarea
- "</p>\n";
- }
-
- /**
- * Select a previously generated captcha image from the queue.
- * @fixme subject to race conditions if lots of files vanish
- * @return mixed tuple of (salt key, text hash) or false if no image to find
- */
- function pickImage() {
- global $wgCaptchaDirectory;
- $n = mt_rand( 0, $this->countFiles( $wgCaptchaDirectory ) );
- $dir = opendir( $wgCaptchaDirectory );
-
- $count = 0;
-
- $entry = readdir( $dir );
- $pick = false;
- while( false !== $entry ) {
- $entry = readdir( $dir );
- if( preg_match( '/^image_([0-9a-f]+)_([0-9a-f]+)\\.png$/', $entry, $matches ) ) {
- $size = getimagesize( "$wgCaptchaDirectory/$entry" );
- $pick = array(
- 'salt' => $matches[1],
- 'hash' => $matches[2],
- 'width' => $size[0],
- 'height' => $size[1],
- 'viewed' => false,
- );
- if( $count++ == $n ) {
- break;
- }
- }
- }
- closedir( $dir );
- return $pick;
- }
-
- /**
- * Count the number of files in a directory.
- * @return int
- */
- function countFiles( $dirname ) {
- $dir = opendir( $dirname );
- $count = 0;
- while( false !== ($entry = readdir( $dir ) ) ) {
- if( $dir != '.' && $dir != '..' ) {
- $count++;
- }
- }
- closedir( $dir );
- return $count;
- }
-
- function showImage() {
- global $wgOut, $wgRequest;
- global $wgCaptchaDirectory;
-
- $wgOut->disable();
-
- $info = $this->retrieveCaptcha();
- if( $info ) {
- if( $info['viewed'] ) {
- wfHttpError( 403, 'Access Forbidden', "Can't view captcha image a second time." );
- return false;
- }
-
- $info['viewed'] = wfTimestamp();
- $this->storeCaptcha( $info );
-
- $salt = $info['salt'];
- $hash = $info['hash'];
- $file = $wgCaptchaDirectory . DIRECTORY_SEPARATOR . "image_{$salt}_{$hash}.png";
-
- if( file_exists( $file ) ) {
- header( 'Content-type: image/png' );
- readfile( $file );
- return true;
- }
- }
- wfHttpError( 500, 'Internal Error', 'Requested bogus captcha image' );
- return false;
- }
-
- /**
- * Show a message asking the user to enter a captcha on edit
- * The result will be treated as wiki text
- *
- * @param $action Action being performed
- * @return string
- */
- function getMessage( $action ) {
- $name = 'fancycaptcha-' . $action;
- $text = wfMsg( $name );
- # Obtain a more tailored message, if possible, otherwise, fall back to
- # the default for edits
- return wfEmptyMsg( $name, $text ) ? wfMsg( 'fancycaptcha-edit' ) : $text;
- }
-
-}
-
-} # End invocation guard
ToastFreeware / toast / cookiecaptcha.git / blobdiff