<?php
-# Prelim in-progress code. Proof of concept for framework, not
-# intended as a real production captcha system!
-
-# Loader for simple captcha feature
-# Include this from LocalSettings.php
+/**
+ * Experimental captcha plugin framework.
+ * Not intended as a real production captcha system; derived classes
+ * can extend the base to produce their fancy images in place of the
+ * text-based test output here.
+ *
+ * Copyright (C) 2005-2007 Brion Vibber <brion@wikimedia.org>
+ * http://www.mediawiki.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @addtogroup Extensions
+ */
if ( defined( 'MEDIAWIKI' ) ) {
global $wgExtensionFunctions, $wgGroupPermissions;
$wgExtensionFunctions[] = 'ceSetup';
+$wgExtensionCredits['other'][] = array(
+ 'name' => 'ConfirmEdit',
+ 'author' => 'Brion Vibber',
+ 'url' => 'http://www.mediawiki.org/wiki/Extension:ConfirmEdit',
+ 'description' => 'Simple captcha implementation',
+);
+
+# Internationalisation file
+require_once( 'ConfirmEdit.i18n.php' );
-$wgGroupPermissions['*' ]['skipcaptcha'] = false;
-$wgGroupPermissions['user' ]['skipcaptcha'] = false;
-$wgGroupPermissions['bot' ]['skipcaptcha'] = true; // registered bots
-$wgGroupPermissions['sysop' ]['skipcaptcha'] = true;
+/**
+ * The 'skipcaptcha' permission key can be given out to
+ * let known-good users perform triggering actions without
+ * having to go through the captcha.
+ *
+ * By default, sysops and registered bot accounts will be
+ * able to skip, while others have to go through it.
+ */
+$wgGroupPermissions['*' ]['skipcaptcha'] = false;
+$wgGroupPermissions['user' ]['skipcaptcha'] = false;
+$wgGroupPermissions['autoconfirmed']['skipcaptcha'] = false;
+$wgGroupPermissions['bot' ]['skipcaptcha'] = true; // registered bots
+$wgGroupPermissions['sysop' ]['skipcaptcha'] = true;
global $wgCaptcha, $wgCaptchaClass, $wgCaptchaTriggers;
$wgCaptcha = null;
$wgCaptchaClass = 'SimpleCaptcha';
+/**
+ * Actions which can trigger a captcha
+ *
+ * If the 'edit' trigger is on, *every* edit will trigger the captcha.
+ * This may be useful for protecting against vandalbot attacks.
+ *
+ * If using the default 'addurl' trigger, the captcha will trigger on
+ * edits that include URLs that aren't in the current version of the page.
+ * This should catch automated linkspammers without annoying people when
+ * they make more typical edits.
+ *
+ * The captcha code should not use $wgCaptchaTriggers, but CaptchaTriggers()
+ * which also takes into account per namespace triggering.
+ */
$wgCaptchaTriggers = array();
-$wgCaptchaTriggers['edit'] = false; // Would check on every edit
-$wgCaptchaTriggers['addurl'] = true; // Check on edits that add URLs
+$wgCaptchaTriggers['edit'] = false; // Would check on every edit
+$wgCaptchaTriggers['create'] = false; // Check on page creation.
+$wgCaptchaTriggers['addurl'] = true; // Check on edits that add URLs
+$wgCaptchaTriggers['createaccount'] = true; // Special:Userlogin&type=signup
+$wgCaptchaTriggers['badlogin'] = true; // Special:Userlogin after failure
+
+/**
+ * You may wish to apply special rules for captcha triggering on some namespaces.
+ * $wgCaptchaTriggersOnNamespace[<namespace id>][<trigger>] forces an always on /
+ * always off configuration with that trigger for the given namespace.
+ * Leave unset to use the global options ($wgCaptchaTriggers).
+ *
+ * Shall not be used with 'createaccount' (it is not checked).
+ */
+$wgCaptchaTriggersOnNamespace = array();
+
+#Example:
+#$wgCaptchaTriggersOnNamespace[NS_TALK]['create'] = false; //Allow creation of talk pages without captchas.
+#$wgCaptchaTriggersOnNamespace[NS_PROJECT]['edit'] = true; //Show captcha whenever editing Project pages.
+
+/**
+ * Indicate how to store per-session data required to match up the
+ * internal captcha data with the editor.
+ *
+ * 'CaptchaSessionStore' uses PHP's session storage, which is cookie-based
+ * and may fail for anons with cookies disabled.
+ *
+ * 'CaptchaCacheStore' uses $wgMemc, which avoids the cookie dependency
+ * but may be fragile depending on cache configuration.
+ */
+global $wgCaptchaStorageClass;
+$wgCaptchaStorageClass = 'CaptchaSessionStore';
+
+/**
+ * Number of seconds a captcha session should last in the data cache
+ * before expiring when managing through CaptchaCacheStore class.
+ *
+ * Default is a half hour.
+ */
+global $wgCaptchaSessionExpiration;
+$wgCaptchaSessionExpiration = 30 * 60;
+
+/**
+ * Number of seconds after a bad login that a captcha will be shown to
+ * that client on the login form to slow down password-guessing bots.
+ *
+ * Has no effect if 'badlogin' is disabled in $wgCaptchaTriggers or
+ * if there is not a caching engine enabled.
+ *
+ * Default is five minutes.
+ */
+global $wgCaptchaBadLoginExpiration;
+$wgCaptchaBadLoginExpiration = 5 * 60;
/**
* Allow users who have confirmed their e-mail addresses to post
global $ceAllowConfirmedEmail;
$ceAllowConfirmedEmail = false;
+/**
+ * Regex to whitelist URLs to known-good sites...
+ * For instance:
+ * $wgCaptchaWhitelist = '#^https?://([a-z0-9-]+\\.)?(wikimedia|wikipedia)\.org/#i';
+ * Local admins can define a whitelist under [[MediaWiki:captcha-addurl-whitelist]]
+ */
+$wgCaptchaWhitelist = false;
+
+/**
+ * Additional regexes to check for. Use full regexes; can match things
+ * other than URLs such as junk edits.
+ *
+ * If the new version matches one and the old version doesn't,
+ * toss up the captcha screen.
+ *
+ * @fixme Add a message for local admins to add items as well.
+ */
+$wgCaptchaRegexes = array();
+
+/** Register special page */
+global $wgSpecialPages;
+$wgSpecialPages['Captcha'] = array( /*class*/ 'SpecialPage', /*name*/'Captcha', /*restriction*/ '',
+ /*listed*/ false, /*function*/ false, /*file*/ false );
+
/**
* Set up message strings for captcha utilities.
*/
function ceSetup() {
- global $wgMessageCache, $wgHooks, $wgCaptcha, $wgCaptchaClass;
- $wgMessageCache->addMessage('captcha-short', "Your edit includes new URL links; as a protection
- against automated spam, you'll need to enter the answer to this
- simple arithmetic test:" );
-
- SpecialPage::addPage( new SpecialPage( 'Captcha', false,
- /*listed*/ false, /*function*/ false, /*file*/ false ) );
-
+ # Add messages
+ global $wgMessageCache, $wgConfirmEditMessages;
+ foreach( $wgConfirmEditMessages as $lang => $messages )
+ $wgMessageCache->addMessages( $messages, $lang );
+
+ global $wgHooks, $wgCaptcha, $wgCaptchaClass, $wgSpecialPages;
$wgCaptcha = new $wgCaptchaClass();
$wgHooks['EditFilter'][] = array( &$wgCaptcha, 'confirmEdit' );
+
+ $wgHooks['UserCreateForm'][] = array( &$wgCaptcha, 'injectUserCreate' );
+ $wgHooks['AbortNewAccount'][] = array( &$wgCaptcha, 'confirmUserCreate' );
+
+ $wgHooks['LoginAuthenticateAudit'][] = array( &$wgCaptcha, 'triggerUserLogin' );
+ $wgHooks['UserLoginForm'][] = array( &$wgCaptcha, 'injectUserLogin' );
+ $wgHooks['AbortLogin'][] = array( &$wgCaptcha, 'confirmUserLogin' );
+
+ global $wgGroupPermissions, $wgCaptchaTriggers;
+ if( !$wgGroupPermissions['*']['read'] && $wgCaptchaTriggers['badlogin'] ) {
+ // We need to ensure that the captcha interface is accessible
+ // so that unauthenticated users can actually get in after a
+ // mistaken password typing.
+ global $wgWhitelistRead;
+ $image = Title::makeTitle( NS_SPECIAL, 'Captcha/image' );
+ $help = Title::makeTitle( NS_SPECIAL, 'Captcha/help' );
+ $wgWhitelistRead[] = $image->getPrefixedText();
+ $wgWhitelistRead[] = $help->getPrefixedText();
+ }
}
/**
}
class SimpleCaptcha {
+ function SimpleCaptcha() {
+ global $wgCaptchaStorageClass;
+ $this->storage = new $wgCaptchaStorageClass;
+ }
+
+ /**
+ * Insert a captcha prompt into the edit form.
+ * This sample implementation generates a simple arithmetic operation;
+ * it would be easy to defeat by machine.
+ *
+ * Override this!
+ *
+ * @return string HTML
+ */
+ function getForm() {
+ $a = mt_rand(0, 100);
+ $b = mt_rand(0, 10);
+ $op = mt_rand(0, 1) ? '+' : '-';
+
+ $test = "$a $op $b";
+ $answer = ($op == '+') ? ($a + $b) : ($a - $b);
+
+ $index = $this->storeCaptcha( array( 'answer' => $answer ) );
+
+ return "<p><label for=\"wpCaptchaWord\">$test</label> = " .
+ wfElement( 'input', array(
+ 'name' => 'wpCaptchaWord',
+ 'id' => 'wpCaptchaWord',
+ 'tabindex' => 1 ) ) . // tab in before the edit textarea
+ "</p>\n" .
+ wfElement( 'input', array(
+ 'type' => 'hidden',
+ 'name' => 'wpCaptchaId',
+ 'id' => 'wpCaptchaId',
+ 'value' => $index ) );
+ }
+
+ /**
+ * Insert the captcha prompt into an edit form.
+ * @param OutputPage $out
+ */
+ function editCallback( &$out ) {
+ $out->addWikiText( $this->getMessage( $this->action ) );
+ $out->addHTML( $this->getForm() );
+ }
+
+ /**
+ * 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 = 'captcha-' . $action;
+ $text = wfMsg( $name );
+ # Obtain a more tailored message, if possible, otherwise, fall back to
+ # the default for edits
+ return wfEmptyMsg( $name, $text ) ? wfMsg( 'captcha-edit' ) : $text;
+ }
+
+ /**
+ * Inject whazawhoo
+ * @fixme if multiple thingies insert a header, could break
+ * @param SimpleTemplate $template
+ * @return bool true to keep running callbacks
+ */
+ function injectUserCreate( &$template ) {
+ global $wgCaptchaTriggers, $wgOut;
+ if( $wgCaptchaTriggers['createaccount'] ) {
+ $template->set( 'header',
+ "<div class='captcha'>" .
+ $wgOut->parse( $this->getMessage( 'createaccount' ) ) .
+ $this->getForm() .
+ "</div>\n" );
+ }
+ return true;
+ }
+
+ /**
+ * Inject a captcha into the user login form after a failed
+ * password attempt as a speedbump for mass attacks.
+ * @fixme if multiple thingies insert a header, could break
+ * @param SimpleTemplate $template
+ * @return bool true to keep running callbacks
+ */
+ function injectUserLogin( &$template ) {
+ if( $this->isBadLoginTriggered() ) {
+ global $wgOut;
+ $template->set( 'header',
+ "<div class='captcha'>" .
+ $wgOut->parse( $this->getMessage( 'badlogin' ) ) .
+ $this->getForm() .
+ "</div>\n" );
+ }
+ return true;
+ }
+
+ /**
+ * When a bad login attempt is made, increment an expiring counter
+ * in the memcache cloud. Later checks for this may trigger a
+ * captcha display to prevent too many hits from the same place.
+ * @param User $user
+ * @param string $password
+ * @param int $retval authentication return value
+ * @return bool true to keep running callbacks
+ */
+ function triggerUserLogin( $user, $password, $retval ) {
+ global $wgCaptchaTriggers, $wgCaptchaBadLoginExpiration, $wgMemc;
+ if( $retval == LoginForm::WRONG_PASS && $wgCaptchaTriggers['badlogin'] ) {
+ $key = $this->badLoginKey();
+ $count = $wgMemc->get( $key );
+ if( !$count ) {
+ $wgMemc->add( $key, 0, $wgCaptchaBadLoginExpiration );
+ }
+ $count = $wgMemc->incr( $key );
+ }
+ return true;
+ }
+
+ /**
+ * Check if a bad login has already been registered for this
+ * IP address. If so, require a captcha.
+ * @return bool
+ * @access private
+ */
+ function isBadLoginTriggered() {
+ global $wgMemc;
+ return intval( $wgMemc->get( $this->badLoginKey() ) ) > 0;
+ }
+
+ /**
+ * Internal cache key for badlogin checks.
+ * @return string
+ * @access private
+ */
+ function badLoginKey() {
+ return wfMemcKey( 'captcha', 'badlogin', 'ip', wfGetIP() );
+ }
+
+ /**
+ * Check if the submitted form matches the captcha session data provided
+ * by the plugin when the form was generated.
+ *
+ * Override this!
+ *
+ * @param WebRequest $request
+ * @param array $info
+ * @return bool
+ */
+ function keyMatch( $request, $info ) {
+ return $request->getVal( 'wpCaptchaWord' ) == $info['answer'];
+ }
+
+ // ----------------------------------
+
+ /**
+ * @param EditPage $editPage
+ * @param string $action (edit/create/addurl...)
+ * @return bool true if action triggers captcha on editPage's namespace
+ */
+ function captchaTriggers( &$editPage, $action) {
+ global $wgCaptchaTriggers, $wgCaptchaTriggersOnNamespace;
+ //Special config for this NS?
+ if (isset( $wgCaptchaTriggersOnNamespace[$editPage->mTitle->getNamespace()][$action] ) )
+ return $wgCaptchaTriggersOnNamespace[$editPage->mTitle->getNamespace()][$action];
+
+ return ( !empty( $wgCaptchaTriggers[$action] ) ); //Default
+ }
+
+
/**
* @param EditPage $editPage
* @param string $newtext
* @return bool true if the captcha should run
*/
function shouldCheck( &$editPage, $newtext, $section ) {
+ $this->trigger = '';
+
global $wgUser;
if( $wgUser->isAllowed( 'skipcaptcha' ) ) {
- wfDebug( "SimpleCaptcha: user group allows skipping captcha\n" );
+ wfDebug( "ConfirmEdit: user group allows skipping captcha\n" );
return false;
}
-
+
global $wgEmailAuthentication, $ceAllowConfirmedEmail;
if( $wgEmailAuthentication && $ceAllowConfirmedEmail &&
$wgUser->isEmailConfirmed() ) {
- wfDebug( "SimpleCaptcha: user has confirmed mail, skipping captcha\n" );
+ wfDebug( "ConfirmEdit: user has confirmed mail, skipping captcha\n" );
return false;
}
-
- global $wgCaptchaTriggers;
- if( !empty( $wgCaptchaTriggers['edit'] ) ) {
+
+ if( $this->captchaTriggers( $editPage, 'edit' ) ) {
// Check on all edits
- wfDebug( "SimpleCaptcha: checking all edits...\n" );
+ global $wgUser, $wgTitle;
+ $this->trigger = sprintf( "edit trigger by '%s' at [[%s]]",
+ $wgUser->getName(),
+ $wgTitle->getPrefixedText() );
+ $this->action = 'edit';
+ wfDebug( "ConfirmEdit: checking all edits...\n" );
+ return true;
+ }
+
+ if( $this->captchaTriggers( $editPage, 'create' ) && !$editPage->mTitle->exists() ) {
+ //Check if creating a page
+ global $wgUser, $wgTitle;
+ $this->trigger = sprintf( "Create trigger by '%s' at [[%s]]",
+ $wgUser->getName(),
+ $wgTitle->getPrefixedText() );
+ $this->action = 'create';
+ wfDebug( "ConfirmEdit: checking on page creation...\n" );
return true;
}
-
- if( !empty( $wgCaptchaTriggers['addurl'] ) ) {
+
+ if( $this->captchaTriggers( $editPage, 'addurl' ) ) {
// Only check edits that add URLs
$oldtext = $this->loadText( $editPage, $section );
-
+
$oldLinks = $this->findLinks( $oldtext );
$newLinks = $this->findLinks( $newtext );
-
- $addedLinks = array_diff( $newLinks, $oldLinks );
+ $unknownLinks = array_filter( $newLinks, array( &$this, 'filterLink' ) );
+
+ $addedLinks = array_diff( $unknownLinks, $oldLinks );
$numLinks = count( $addedLinks );
-
+
if( $numLinks > 0 ) {
- wfDebug( "SimpleCaptcha: found $numLinks new links; triggered...\n" );
+ global $wgUser, $wgTitle;
+ $this->trigger = sprintf( "%dx url trigger by '%s' at [[%s]]: %s",
+ $numLinks,
+ $wgUser->getName(),
+ $wgTitle->getPrefixedText(),
+ implode( ", ", $addedLinks ) );
+ $this->action = 'addurl';
return true;
}
}
-
+
+ global $wgCaptchaRegexes;
+ if( !empty( $wgCaptchaRegexes ) ) {
+ // Custom regex checks
+ $oldtext = $this->loadText( $editPage, $section );
+
+ foreach( $wgCaptchaRegexes as $regex ) {
+ $newMatches = array();
+ if( preg_match_all( $regex, $newtext, $newMatches ) ) {
+ $oldMatches = array();
+ preg_match_all( $regex, $oldtext, $oldMatches );
+
+ $addedMatches = array_diff( $newMatches[0], $oldMatches[0] );
+
+ $numHits = count( $addedMatches );
+ if( $numHits > 0 ) {
+ global $wgUser, $wgTitle;
+ $this->trigger = sprintf( "%dx %s at [[%s]]: %s",
+ $numHits,
+ $regex,
+ $wgUser->getName(),
+ $wgTitle->getPrefixedText(),
+ implode( ", ", $addedMatches ) );
+ $this->action = 'edit';
+ return true;
+ }
+ }
+ }
+ }
+
return false;
}
-
+
+ /**
+ * Filter callback function for URL whitelisting
+ * @param string url to check
+ * @return bool true if unknown, false if whitelisted
+ * @access private
+ */
+ function filterLink( $url ) {
+ global $wgCaptchaWhitelist;
+ $source = wfMsgForContent( 'captcha-addurl-whitelist' );
+
+ $whitelist = wfEmptyMsg( 'captcha-addurl-whitelist', $source )
+ ? false
+ : $this->buildRegexes( explode( "\n", $source ) );
+
+ $cwl = $wgCaptchaWhitelist !== false ? preg_match( $wgCaptchaWhitelist, $url ) : false;
+ $wl = $whitelist !== false ? preg_match( $whitelist, $url ) : false;
+
+ return !( $cwl || $wl );
+ }
+
+ /**
+ * Build regex from whitelist
+ * @param string lines from [[MediaWiki:Captcha-addurl-whitelist]]
+ * @return string Regex or bool false if whitelist is empty
+ * @access private
+ */
+ function buildRegexes( $lines ) {
+ # Code duplicated from the SpamBlacklist extension (r19197)
+
+ # Strip comments and whitespace, then remove blanks
+ $lines = array_filter( array_map( 'trim', preg_replace( '/#.*$/', '', $lines ) ) );
+
+ # No lines, don't make a regex which will match everything
+ if ( count( $lines ) == 0 ) {
+ wfDebug( "No lines\n" );
+ return false;
+ } else {
+ # Make regex
+ # It's faster using the S modifier even though it will usually only be run once
+ //$regex = 'http://+[a-z0-9_\-.]*(' . implode( '|', $lines ) . ')';
+ //return '/' . str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $regex) ) . '/Si';
+ $regexes = '';
+ $regexStart = '/http:\/\/+[a-z0-9_\-.]*(';
+ $regexEnd = ')/Si';
+ $regexMax = 4096;
+ $build = false;
+ foreach( $lines as $line ) {
+ // FIXME: not very robust size check, but should work. :)
+ if( $build === false ) {
+ $build = $line;
+ } elseif( strlen( $build ) + strlen( $line ) > $regexMax ) {
+ $regexes .= $regexStart .
+ str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $build) ) .
+ $regexEnd;
+ $build = $line;
+ } else {
+ $build .= '|' . $line;
+ }
+ }
+ if( $build !== false ) {
+ $regexes .= $regexStart .
+ str_replace( '/', '\/', preg_replace('|\\\*/|', '/', $build) ) .
+ $regexEnd;
+ }
+ return $regexes;
+ }
+ }
+
+ /**
+ * The main callback run on edit attempts.
+ * @param EditPage $editPage
+ * @param string $newtext
+ * @param string $section
+ * @param bool true to continue saving, false to abort and show a captcha form
+ */
function confirmEdit( &$editPage, $newtext, $section ) {
if( $this->shouldCheck( $editPage, $newtext, $section ) ) {
- if( $this->keyMatch() ) {
- wfDebug( "ConfirmEdit given proper key from form, passing.\n" );
+ if( $this->passCaptcha() ) {
return true;
} else {
- wfDebug( "ConfirmEdit missing form key, prompting.\n" );
- $editPage->showEditForm( array( &$this, 'formCallback' ) );
+ $editPage->showEditForm( array( &$this, 'editCallback' ) );
return false;
}
} else {
- wfDebug( "ConfirmEdit: no new links.\n" );
+ wfDebug( "ConfirmEdit: no need to show captcha.\n" );
return true;
}
}
+
+ /**
+ * Hook for user creation form submissions.
+ * @param User $u
+ * @param string $message
+ * @return bool true to continue, false to abort user creation
+ */
+ function confirmUserCreate( $u, &$message ) {
+ global $wgCaptchaTriggers;
+ if( $wgCaptchaTriggers['createaccount'] ) {
+ $this->trigger = "new account '" . $u->getName() . "'";
+ if( !$this->passCaptcha() ) {
+ $message = wfMsg( 'captcha-createaccount-fail' );
+ return false;
+ }
+ }
+ return true;
+ }
- function keyMatch() {
- if( !isset( $_SESSION['ceAnswerVar'] ) ) {
- wfDebug( "ConfirmEdit no session captcha key set, this is new visitor.\n" );
+ /**
+ * Hook for user login form submissions.
+ * @param User $u
+ * @param string $message
+ * @return bool true to continue, false to abort user creation
+ */
+ function confirmUserLogin( $u, $pass, &$retval ) {
+ if( $this->isBadLoginTriggered() ) {
+ $this->trigger = "post-badlogin login '" . $u->getName() . "'";
+ if( !$this->passCaptcha() ) {
+ $message = wfMsg( 'captcha-badlogin-fail' );
+ // Emulate a bad-password return to confuse the shit out of attackers
+ $retval = LoginForm::WRONG_PASS;
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Given a required captcha run, test form input for correct
+ * input on the open session.
+ * @return bool if passed, false if failed or new session
+ */
+ function passCaptcha() {
+ $info = $this->retrieveCaptcha();
+ if( $info ) {
+ global $wgRequest;
+ if( $this->keyMatch( $wgRequest, $info ) ) {
+ $this->log( "passed" );
+ $this->clearCaptcha( $info );
+ return true;
+ } else {
+ $this->clearCaptcha( $info );
+ $this->log( "bad form input" );
+ return false;
+ }
+ } else {
+ $this->log( "new captcha session" );
return false;
}
+ }
+
+ /**
+ * Log the status and any triggering info for debugging or statistics
+ * @param string $message
+ */
+ function log( $message ) {
+ wfDebugLog( 'captcha', 'ConfirmEdit: ' . $message . '; ' . $this->trigger );
+ }
+
+ /**
+ * Generate a captcha session ID and save the info in PHP's session storage.
+ * (Requires the user to have cookies enabled to get through the captcha.)
+ *
+ * A random ID is used so legit users can make edits in multiple tabs or
+ * windows without being unnecessarily hobbled by a serial order requirement.
+ * Pass the returned id value into the edit form as wpCaptchaId.
+ *
+ * @param array $info data to store
+ * @return string captcha ID key
+ */
+ function storeCaptcha( $info ) {
+ if( !isset( $info['index'] ) ) {
+ // Assign random index if we're not udpating
+ $info['index'] = strval( mt_rand() );
+ }
+ $this->storage->store( $info['index'], $info );
+ return $info['index'];
+ }
+
+ /**
+ * Fetch this session's captcha info.
+ * @return mixed array of info, or false if missing
+ */
+ function retrieveCaptcha() {
global $wgRequest;
- return $wgRequest->getVal( $_SESSION['ceAnswerVar'] ) == $_SESSION['ceAnswer'];
+ $index = $wgRequest->getVal( 'wpCaptchaId' );
+ return $this->storage->retrieve( $index );
}
-
- function formCallback( &$out ) {
- $source = 'ceSource' . mt_rand();
- $dest = 'ceConfirm' . mt_rand();
-
- $a = mt_rand(0, 100);
- $b = mt_rand(0, 10);
- $op = mt_rand(0, 1) ? '+' : '-';
-
- $test = "$a $op $b";
- $answer = ($op == '+') ? ($a + $b) : ($a - $b);
- $_SESSION['ceAnswer'] = $answer;
- $_SESSION['ceAnswerVar'] = $dest;
-
-
- $out->addWikiText( wfMsg( "captcha-short" ) );
- $out->addHTML( <<<END
- <p><span id="$source"><label for="$dest">$test</label></span> = <input name="$dest" id="$dest" /></p>
-END
- );
+
+ /**
+ * Clear out existing captcha info from the session, to ensure
+ * it can't be reused.
+ */
+ function clearCaptcha( $info ) {
+ $this->storage->clear( $info['index'] );
}
-
+
+ /**
+ * Retrieve the current version of the page or section being edited...
+ * @param EditPage $editPage
+ * @param string $section
+ * @return string
+ * @access private
+ */
function loadText( $editPage, $section ) {
$rev = Revision::newFromTitle( $editPage->mTitle );
if( is_null( $rev ) ) {
}
}
}
-
+
+ /**
+ * Extract a list of all recognized HTTP links in the text.
+ * @param string $text
+ * @return array of strings
+ */
function findLinks( $text ) {
- $regex = '/((?:' . HTTP_PROTOCOLS . ')' . EXT_LINK_URL_CLASS . '+)/';
-
- if( preg_match_all( $regex, $text, $matches, PREG_PATTERN_ORDER ) ) {
- return $matches[1];
- } else {
- return array();
- }
+ global $wgParser, $wgTitle, $wgUser;
+
+ $options = new ParserOptions();
+ $text = $wgParser->preSaveTransform( $text, $wgTitle, $wgUser, $options );
+ $out = $wgParser->parse( $text, $wgTitle, $options );
+
+ return array_keys( $out->getExternalLinks() );
}
-
+
+ /**
+ * Show a page explaining what this wacky thing is.
+ */
function showHelp() {
global $wgOut, $ceAllowConfirmedEmail;
- $wgOut->setPageTitle( 'Captcha help' );
- $wgOut->addWikiText( <<<END
- So what's this wacky captcha thing about?
+ $wgOut->setPageTitle( wfMsg( 'captchahelp-title' ) );
+ $wgOut->addWikiText( wfMsg( 'captchahelp-text' ) );
+ if ( $this->storage->cookiesNeeded() ) {
+ $wgOut->addWikiText( wfMsg( 'captchahelp-cookies-needed' ) );
+ }
+ }
+
+}
+
+class CaptchaSessionStore {
+ function store( $index, $info ) {
+ $_SESSION['captcha' . $info['index']] = $info;
+ }
- It's your enemy. It's here to kill you. RUN WHILE YOU STILL CAN
-END
- );
+ function retrieve( $index ) {
+ if( isset( $_SESSION['captcha' . $index] ) ) {
+ return $_SESSION['captcha' . $index];
+ } else {
+ return false;
+ }
+ }
+
+ function clear( $index ) {
+ unset( $_SESSION['captcha' . $index] );
+ }
+
+ function cookiesNeeded() {
+ return true;
+ }
+}
+
+class CaptchaCacheStore {
+ function store( $index, $info ) {
+ global $wgMemc, $wgCaptchaSessionExpiration;
+ $wgMemc->set( wfMemcKey( 'captcha', $index ), $info,
+ $wgCaptchaSessionExpiration );
+ }
+
+ function retrieve( $index ) {
+ global $wgMemc;
+ $info = $wgMemc->get( wfMemcKey( 'captcha', $index ) );
+ if( $info ) {
+ return $info;
+ } else {
+ return false;
+ }
}
+ function clear( $index ) {
+ global $wgMemc;
+ $wgMemc->delete( wfMemcKey( 'captcha', $index ) );
+ }
+
+ function cookiesNeeded() {
+ return false;
+ }
}
} # End invocation guard
-?>
+
ToastFreeware / toast / cookiecaptcha.git / blobdiff