1 files changed, 134 insertions, 0 deletions
diff --git a/extensions/ConfirmEdit/ReCaptcha.php b/extensions/ConfirmEdit/ReCaptcha.php
new file mode 100644
index 00000000..b068b86e
--- /dev/null
+++ b/extensions/ConfirmEdit/ReCaptcha.php
@@ -0,0 +1,134 @@
+<?php
+
+/**
+ * Captcha class using the reCAPTCHA widget. 
+ * Stop Spam. Read Books.  
+ *
+ * @addtogroup Extensions
+ * @author Mike Crawford <mike.crawford@gmail.com>
+ * @copyright Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
+ * @licence MIT/X11
+ */
+
+if( !defined( 'MEDIAWIKI' ) ) {
+	exit;
+}
+
+$wgExtensionMessagesFiles['ReCaptcha'] = dirname( __FILE__ ) . '/ReCaptcha.i18n.php';
+
+require_once( 'recaptchalib.php' );
+
+// Set these in LocalSettings.php
+$wgReCaptchaPublicKey = '';
+$wgReCaptchaPrivateKey = '';
+// For backwards compatibility
+$recaptcha_public_key = '';
+$recaptcha_private_key = '';
+
+$wgExtensionFunctions[] = 'efReCaptcha';
+
+/**
+ * Make sure the keys are defined.
+ */
+function efReCaptcha() {
+	global $wgReCaptchaPublicKey, $wgReCaptchaPrivateKey;
+	global $recaptcha_public_key, $recaptcha_private_key;
+	global $wgServerName;
+
+	// Backwards compatibility
+	if ( $wgReCaptchaPublicKey == '' ) {
+		$wgReCaptchaPublicKey = $recaptcha_public_key;
+	}
+	if ( $wgReCaptchaPrivateKey == '' ) {
+		$wgReCaptchaPrivateKey = $recaptcha_private_key;
+	}
+
+	if ($wgReCaptchaPublicKey == '' || $wgReCaptchaPrivateKey == '') {
+		die ('You need to set $wgReCaptchaPrivateKey and $wgReCaptchaPublicKey in LocalSettings.php to ' .
+		     "use the reCAPTCHA plugin. You can sign up for a key <a href='" .
+		     htmlentities(recaptcha_get_signup_url ($wgServerName, "mediawiki")) . "'>here</a>.");
+	}	
+}
+
+
+class ReCaptcha extends SimpleCaptcha {
+
+	//reCAPTHCA error code returned from recaptcha_check_answer
+	private $recaptcha_error = null;
+
+	/**
+	 * Displays the reCAPTCHA widget.
+         * If $this->recaptcha_error is set, it will display an error in the widget.
+	 *
+         */
+	function getForm() {
+		global $wgReCaptchaPublicKey;
+		$useHttps = ( isset( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] == 'on' );
+		return "<script>var RecaptchaOptions = { tabindex : 1 }; </script> " .
+			recaptcha_get_html($wgReCaptchaPublicKey, $this->recaptcha_error, $useHttps);
+	}
+
+	/**
+	 * Calls the library function recaptcha_check_answer to verify the users input.
+	 * Sets $this->recaptcha_error if the user is incorrect.
+         * @return boolean
+         *
+         */
+	function passCaptcha() {
+		global $wgReCaptchaPrivateKey;
+		$recaptcha_response = recaptcha_check_answer ($wgReCaptchaPrivateKey,
+							      wfGetIP (),
+							      $_POST['recaptcha_challenge_field'],
+							      $_POST['recaptcha_response_field']);
+                if (!$recaptcha_response->is_valid) {
+			$this->recaptcha_error = $recaptcha_response->error;
+			return false;
+                }
+		$recaptcha_error = null;
+                return true;
+
+	}
+
+	/**
+	 * Called on all edit page saves. (EditFilter events)
+	 * @return boolean - true if page save should continue, false if should display Captcha widget.
+	 */
+	function confirmEdit( $editPage, $newtext, $section, $merged = false ) {
+		if( $this->shouldCheck( $editPage, $newtext, $section ) ) {
+
+			if (!isset($_POST['recaptcha_response_field'])) {
+					//User has not yet been presented with Captcha, show the widget.
+					$editPage->showEditForm( array( &$this, 'editCallback' ) );
+					return false;
+			}
+
+			if( $this->passCaptcha() ) {
+					return true;
+			} else {
+					//Try again - show the widget
+					$editPage->showEditForm( array( &$this, 'editCallback' ) );
+					return false;
+			}
+
+		} else {
+			wfDebug( "ConfirmEdit: no need to show captcha.\n" );
+			return true;
+		}
+	}
+
+	/**
+	 * 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 = 'recaptcha-' . $action;
+		$text = wfMsg( $name );
+		# Obtain a more tailored message, if possible, otherwise, fall back to
+		# the default for edits
+		return wfEmptyMsg( $name, $text ) ? wfMsg( 'recaptcha-edit' ) : $text;
+	}
+
+}