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-rw-r--r--extensions/ConfirmEdit/SimpleCaptcha/Captcha.php974
1 files changed, 974 insertions, 0 deletions
diff --git a/extensions/ConfirmEdit/SimpleCaptcha/Captcha.php b/extensions/ConfirmEdit/SimpleCaptcha/Captcha.php
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index 00000000..21ba842c
--- /dev/null
+++ b/extensions/ConfirmEdit/SimpleCaptcha/Captcha.php
@@ -0,0 +1,974 @@
+<?php
+
+class SimpleCaptcha {
+ private $showEditCaptcha = false;
+
+ /** @var boolean|null Was the CAPTCHA already passed and if yes, with which result? */
+ private $captchaSolved = null;
+
+ function getCaptcha() {
+ $a = mt_rand( 0, 100 );
+ $b = mt_rand( 0, 10 );
+
+ /* Minus sign is used in the question. UTF-8,
+ since the api uses text/plain, not text/html */
+ $op = mt_rand( 0, 1 ) ? '+' : '−';
+
+ // No space before and after $op, to ensure correct
+ // directionality.
+ $test = "$a$op$b";
+ $answer = ( $op == '+' ) ? ( $a + $b ) : ( $a - $b );
+ return array( 'question' => $test, 'answer' => $answer );
+ }
+
+ function addCaptchaAPI( &$resultArr ) {
+ $captcha = $this->getCaptcha();
+ $index = $this->storeCaptcha( $captcha );
+ $resultArr['captcha']['type'] = 'simple';
+ $resultArr['captcha']['mime'] = 'text/plain';
+ $resultArr['captcha']['id'] = $index;
+ $resultArr['captcha']['question'] = $captcha['question'];
+ }
+
+ /**
+ * 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() {
+ $captcha = $this->getCaptcha();
+ $index = $this->storeCaptcha( $captcha );
+
+ return "<p><label for=\"wpCaptchaWord\">{$captcha['question']} = </label>" .
+ Xml::element( 'input', array(
+ 'name' => 'wpCaptchaWord',
+ 'class' => 'mw-ui-input',
+ 'id' => 'wpCaptchaWord',
+ 'size' => 5,
+ 'autocomplete' => 'off',
+ 'tabindex' => 1 ) ) . // tab in before the edit textarea
+ "</p>\n" .
+ Xml::element( 'input', array(
+ 'type' => 'hidden',
+ 'name' => 'wpCaptchaId',
+ 'id' => 'wpCaptchaId',
+ 'value' => $index ) );
+ }
+
+ /**
+ * Show error message for missing or incorrect captcha on EditPage.
+ * @param EditPage $editPage
+ * @param OutputPage $out
+ */
+ function showEditFormFields( &$editPage, &$out ) {
+ $page = $editPage->getArticle()->getPage();
+ if ( !isset( $page->ConfirmEdit_ActivateCaptcha ) ) {
+ return;
+ }
+ unset( $page->ConfirmEdit_ActivateCaptcha );
+ $out->addHTML(
+ Html::openElement(
+ 'div',
+ array(
+ 'id' => 'mw-confirmedit-error-area',
+ 'class' => 'errorbox'
+ )
+ ) .
+ Html::element(
+ 'strong',
+ array(),
+ $out->msg( 'errorpagetitle' )->text()
+ ) .
+ Html::element(
+ 'div',
+ array( 'id' => 'errorbox-body' ),
+ $out->msg( 'captcha-sendemail-fail' )->text()
+ ) .
+ Html::closeElement( 'div' )
+ );
+ $this->showEditCaptcha = true;
+ }
+
+ /**
+ * Insert the captcha prompt into an edit form.
+ * @param EditPage $editPage
+ */
+ function editShowCaptcha( $editPage ) {
+ $context = $editPage->getArticle()->getContext();
+ $page = $editPage->getArticle()->getPage();
+ $out = $context->getOutput();
+ if ( isset( $page->ConfirmEdit_ActivateCaptcha ) ||
+ $this->showEditCaptcha ||
+ $this->shouldCheck( $page, '', '', false )
+ ) {
+ $out->addWikiText( $this->getMessage( $this->action ) );
+ $out->addHTML( $this->getForm() );
+ }
+ unset( $page->ConfirmEdit_ActivateCaptcha );
+ }
+
+ /**
+ * Show a message asking the user to enter a captcha on edit
+ * The result will be treated as wiki text
+ *
+ * @param $action string Action being performed
+ * @return string
+ */
+ function getMessage( $action ) {
+ $name = 'captcha-' . $action;
+ $text = wfMessage( $name )->text();
+ # Obtain a more tailored message, if possible, otherwise, fall back to
+ # the default for edits
+ return wfMessage( $name, $text )->isDisabled() ? wfMessage( 'captcha-edit' )->text() : $text;
+ }
+
+ /**
+ * Inject whazawhoo
+ * @fixme if multiple thingies insert a header, could break
+ * @param $form HTMLForm
+ * @return bool true to keep running callbacks
+ */
+ function injectEmailUser( &$form ) {
+ global $wgCaptchaTriggers, $wgOut, $wgUser;
+ if ( $wgCaptchaTriggers['sendemail'] ) {
+ $this->action = 'sendemail';
+ if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
+ wfDebug( "ConfirmEdit: user group allows skipping captcha on email sending\n" );
+ return true;
+ }
+ $form->addFooterText(
+ "<div class='captcha'>" .
+ $wgOut->parse( $this->getMessage( 'sendemail' ) ) .
+ $this->getForm() .
+ "</div>\n" );
+ }
+ return true;
+ }
+
+ /**
+ * Inject whazawhoo
+ * @fixme if multiple thingies insert a header, could break
+ * @param QuickTemplate $template
+ * @return bool true to keep running callbacks
+ */
+ function injectUserCreate( &$template ) {
+ global $wgCaptchaTriggers, $wgOut, $wgUser;
+ if ( $wgCaptchaTriggers['createaccount'] ) {
+ $this->action = 'usercreate';
+ if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
+ wfDebug( "ConfirmEdit: user group allows skipping captcha on account creation\n" );
+ return true;
+ }
+ $captcha = "<div class='captcha'>" .
+ $wgOut->parse( $this->getMessage( 'createaccount' ) ) .
+ $this->getForm() .
+ "</div>\n";
+ // for older MediaWiki versions
+ if ( is_callable( array( $template, 'extend' ) ) ) {
+ $template->extend( 'extrafields', $captcha );
+ } else {
+ $template->set( 'header', $captcha );
+ }
+ }
+ 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 $template QuickTemplate
+ * @return bool true to keep running callbacks
+ */
+ function injectUserLogin( &$template ) {
+ if ( $this->isBadLoginTriggered() ) {
+ global $wgOut;
+
+ $this->action = 'badlogin';
+ $captcha = "<div class='captcha'>" .
+ $wgOut->parse( $this->getMessage( 'badlogin' ) ) .
+ $this->getForm() .
+ "</div>\n";
+ // for older MediaWiki versions
+ if ( is_callable( array( $template, 'extend' ) ) ) {
+ $template->extend( 'extrafields', $captcha );
+ } else {
+ $template->set( 'header', $captcha );
+ }
+ }
+ 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 );
+ }
+
+ $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, $wgCaptchaTriggers, $wgCaptchaBadLoginAttempts;
+ return $wgCaptchaTriggers['badlogin'] && intval( $wgMemc->get( $this->badLoginKey() ) ) >= $wgCaptchaBadLoginAttempts;
+ }
+
+ /**
+ * Check if the IP is allowed to skip captchas
+ */
+ function isIPWhitelisted() {
+ global $wgCaptchaWhitelistIP;
+
+ if ( $wgCaptchaWhitelistIP ) {
+ global $wgRequest;
+
+ $ip = $wgRequest->getIP();
+
+ foreach ( $wgCaptchaWhitelistIP as $range ) {
+ if ( IP::isInRange( $ip, $range ) ) {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Internal cache key for badlogin checks.
+ * @return string
+ * @access private
+ */
+ function badLoginKey() {
+ global $wgRequest;
+ $ip = $wgRequest->getIP();
+ return wfMemcKey( 'captcha', 'badlogin', 'ip', $ip );
+ }
+
+ /**
+ * Check if the submitted form matches the captcha session data provided
+ * by the plugin when the form was generated.
+ *
+ * Override this!
+ *
+ * @param string $answer
+ * @param array $info
+ * @return bool
+ */
+ function keyMatch( $answer, $info ) {
+ return $answer == $info['answer'];
+ }
+
+ // ----------------------------------
+
+ /**
+ * @param Title $title
+ * @param string $action (edit/create/addurl...)
+ * @return bool true if action triggers captcha on $title's namespace
+ */
+ function captchaTriggers( $title, $action ) {
+ global $wgCaptchaTriggers, $wgCaptchaTriggersOnNamespace;
+ // Special config for this NS?
+ if ( isset( $wgCaptchaTriggersOnNamespace[$title->getNamespace()][$action] ) )
+ return $wgCaptchaTriggersOnNamespace[$title->getNamespace()][$action];
+
+ return ( !empty( $wgCaptchaTriggers[$action] ) ); // Default
+ }
+
+ /**
+ * @param WikiPage $page
+ * @param $content Content|string
+ * @param $section string
+ * @param $isContent bool If true, $content is a Content object
+ * @param $oldtext string The content of the revision prior to $content. When
+ * null this will be loaded from the database.
+ * @return bool true if the captcha should run
+ */
+ function shouldCheck( WikiPage $page, $content, $section, $isContent = false, $oldtext = null ) {
+ $title = $page->getTitle();
+ $this->trigger = '';
+
+ if ( $oldtext === null ) {
+ global $wgRequest;
+ $loadOldtextFlags = $wgRequest->wasPosted()
+ ? Revision::READ_LATEST
+ : Revision::READ_NORMAL;
+ }
+
+ if ( $isContent ) {
+ if ( $content->getModel() == CONTENT_MODEL_WIKITEXT ) {
+ $newtext = $content->getNativeData();
+ } else {
+ $newtext = null;
+ }
+ $isEmpty = $content->isEmpty();
+ } else {
+ $newtext = $content;
+ $isEmpty = $content === '';
+ }
+
+ global $wgUser;
+ if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
+ wfDebug( "ConfirmEdit: user group allows skipping captcha\n" );
+ return false;
+ }
+ if ( $this->isIPWhitelisted() )
+ return false;
+
+
+ global $wgEmailAuthentication, $ceAllowConfirmedEmail;
+ if ( $wgEmailAuthentication && $ceAllowConfirmedEmail &&
+ $wgUser->isEmailConfirmed() ) {
+ wfDebug( "ConfirmEdit: user has confirmed mail, skipping captcha\n" );
+ return false;
+ }
+
+ if ( $this->captchaTriggers( $title, 'edit' ) ) {
+ // Check on all edits
+ global $wgUser;
+ $this->trigger = sprintf( "edit trigger by '%s' at [[%s]]",
+ $wgUser->getName(),
+ $title->getPrefixedText() );
+ $this->action = 'edit';
+ wfDebug( "ConfirmEdit: checking all edits...\n" );
+ return true;
+ }
+
+ if ( $this->captchaTriggers( $title, 'create' ) && !$title->exists() ) {
+ // Check if creating a page
+ global $wgUser;
+ $this->trigger = sprintf( "Create trigger by '%s' at [[%s]]",
+ $wgUser->getName(),
+ $title->getPrefixedText() );
+ $this->action = 'create';
+ wfDebug( "ConfirmEdit: checking on page creation...\n" );
+ return true;
+ }
+
+ if ( !$isEmpty && $this->captchaTriggers( $title, 'addurl' ) ) {
+ // Only check edits that add URLs
+ if ( $isContent ) {
+ // Get links from the database
+ $oldLinks = $this->getLinksFromTracker( $title );
+ // Share a parse operation with Article::doEdit()
+ $editInfo = $page->prepareContentForEdit( $content );
+ if ( $editInfo->output ) {
+ $newLinks = array_keys( $editInfo->output->getExternalLinks() );
+ } else {
+ $newLinks = array();
+ }
+ } else {
+ // Get link changes in the slowest way known to man
+ $oldtext = isset( $oldtext ) ? $oldtext : $this->loadText( $title, $section, $loadOldtextFlags );
+ $oldLinks = $this->findLinks( $title, $oldtext );
+ $newLinks = $this->findLinks( $title, $newtext );
+ }
+
+ $unknownLinks = array_filter( $newLinks, array( &$this, 'filterLink' ) );
+ $addedLinks = array_diff( $unknownLinks, $oldLinks );
+ $numLinks = count( $addedLinks );
+
+ if ( $numLinks > 0 ) {
+ global $wgUser;
+ $this->trigger = sprintf( "%dx url trigger by '%s' at [[%s]]: %s",
+ $numLinks,
+ $wgUser->getName(),
+ $title->getPrefixedText(),
+ implode( ", ", $addedLinks ) );
+ $this->action = 'addurl';
+ return true;
+ }
+ }
+
+ global $wgCaptchaRegexes;
+ if ( $newtext !== null && $wgCaptchaRegexes ) {
+ // Custom regex checks. Reuse $oldtext if set above.
+ $oldtext = isset( $oldtext ) ? $oldtext : $this->loadText( $title, $section, $loadOldtextFlags );
+
+ 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;
+ $this->trigger = sprintf( "%dx %s at [[%s]]: %s",
+ $numHits,
+ $regex,
+ $wgUser->getName(),
+ $title->getPrefixedText(),
+ implode( ", ", $addedMatches ) );
+ $this->action = 'edit';
+ return true;
+ }
+ }
+ }
+ }
+
+ return false;
+ }
+
+ /**
+ * Filter callback function for URL whitelisting
+ * @param $url string to check
+ * @return bool true if unknown, false if whitelisted
+ * @access private
+ */
+ function filterLink( $url ) {
+ global $wgCaptchaWhitelist;
+ static $regexes = null;
+
+ if ( $regexes === null ) {
+ $source = wfMessage( 'captcha-addurl-whitelist' )->inContentLanguage();
+
+ $regexes = $source->isDisabled()
+ ? array()
+ : $this->buildRegexes( explode( "\n", $source->plain() ) );
+
+ if ( $wgCaptchaWhitelist !== false ) {
+ array_unshift( $regexes, $wgCaptchaWhitelist );
+ }
+ }
+
+ foreach ( $regexes as $regex ) {
+ if ( preg_match( $regex, $url ) ) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Build regex from whitelist
+ * @param $lines string from [[MediaWiki:Captcha-addurl-whitelist]]
+ * @return array Regexes
+ * @access private
+ */
+ function buildRegexes( $lines ) {
+ # Code duplicated from the SpamBlacklist extension (r19197)
+ # and later modified.
+
+ # 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 array();
+ } 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 = array();
+ $regexStart = array(
+ 'normal' => '/^(?:https?:)?\/\/+[a-z0-9_\-.]*(?:',
+ 'noprotocol' => '/^(?:',
+ );
+ $regexEnd = array(
+ 'normal' => ')/Si',
+ 'noprotocol' => ')/Si',
+ );
+ $regexMax = 4096;
+ $build = array();
+ foreach ( $lines as $line ) {
+ # Extract flags from the line
+ $options = array();
+ if ( preg_match( '/^(.*?)\s*<([^<>]*)>$/', $line, $matches ) ) {
+ if ( $matches[1] === '' ) {
+ wfDebug( "Line with empty regex\n" );
+ continue;
+ }
+ $line = $matches[1];
+ $opts = preg_split( '/\s*\|\s*/', trim( $matches[2] ) );
+ foreach ( $opts as $opt ) {
+ $opt = strtolower( $opt );
+ if ( $opt == 'noprotocol' ) {
+ $options['noprotocol'] = true;
+ }
+ }
+ }
+
+ $key = isset( $options['noprotocol'] ) ? 'noprotocol' : 'normal';
+
+ // FIXME: not very robust size check, but should work. :)
+ if ( !isset( $build[$key] ) ) {
+ $build[$key] = $line;
+ } elseif ( strlen( $build[$key] ) + strlen( $line ) > $regexMax ) {
+ $regexes[] = $regexStart[$key] .
+ str_replace( '/', '\/', preg_replace( '|\\\*/|', '/', $build[$key] ) ) .
+ $regexEnd[$key];
+ $build[$key] = $line;
+ } else {
+ $build[$key] .= '|' . $line;
+ }
+ }
+ foreach ( $build as $key => $value ) {
+ $regexes[] = $regexStart[$key] .
+ str_replace( '/', '\/', preg_replace( '|\\\*/|', '/', $build[$key] ) ) .
+ $regexEnd[$key];
+ }
+ return $regexes;
+ }
+ }
+
+ /**
+ * Load external links from the externallinks table
+ * @param $title Title
+ * @return Array
+ */
+ function getLinksFromTracker( $title ) {
+ $dbr = wfGetDB( DB_SLAVE );
+ $id = $title->getArticleID(); // should be zero queries
+ $res = $dbr->select( 'externallinks', array( 'el_to' ),
+ array( 'el_from' => $id ), __METHOD__ );
+ $links = array();
+ foreach ( $res as $row ) {
+ $links[] = $row->el_to;
+ }
+ return $links;
+ }
+
+ /**
+ * Backend function for confirmEdit() and confirmEditAPI()
+ * @param WikiPage $page
+ * @param $newtext string
+ * @param $section
+ * @param $isContent bool
+ * @return bool false if the CAPTCHA is rejected, true otherwise
+ */
+ private function doConfirmEdit( WikiPage $page, $newtext, $section, $isContent = false ) {
+ global $wgRequest;
+ if ( $wgRequest->getVal( 'captchaid' ) ) {
+ $wgRequest->setVal( 'wpCaptchaId', $wgRequest->getVal( 'captchaid' ) );
+ }
+ if ( $wgRequest->getVal( 'captchaword' ) ) {
+ $wgRequest->setVal( 'wpCaptchaWord', $wgRequest->getVal( 'captchaword' ) );
+ }
+ if ( $this->shouldCheck( $page, $newtext, $section, $isContent ) ) {
+ return $this->passCaptchaLimited();
+ } else {
+ wfDebug( "ConfirmEdit: no need to show captcha.\n" );
+ return true;
+ }
+ }
+
+ /**
+ * An efficient edit filter callback based on the text after section merging
+ * @param RequestContext $context
+ * @param Content $content
+ * @param Status $status
+ * @param $summary
+ * @param $user
+ * @param $minorEdit
+ * @return bool
+ */
+ function confirmEditMerged( $context, $content, $status, $summary, $user, $minorEdit ) {
+ $legacyMode = !defined( 'MW_EDITFILTERMERGED_SUPPORTS_API' );
+ if ( defined( 'MW_API' ) && $legacyMode ) {
+ # API mode
+ # The CAPTCHA was already checked and approved
+ return true;
+ }
+ $page = $context->getWikiPage();
+ if ( !$this->doConfirmEdit( $page, $content, false, true ) ) {
+ if ( $legacyMode ) {
+ $status->fatal( 'hookaborted' );
+ }
+ $status->value = EditPage::AS_HOOK_ERROR_EXPECTED;
+ $status->apiHookResult = array();
+ $this->addCaptchaAPI( $status->apiHookResult );
+ $page->ConfirmEdit_ActivateCaptcha = true;
+ return $legacyMode;
+ }
+ return true;
+ }
+
+ function confirmEditAPI( $editPage, $newText, &$resultArr ) {
+ $page = $editPage->getArticle()->getPage();
+ if ( !$this->doConfirmEdit( $page, $newText, false, false ) ) {
+ $this->addCaptchaAPI( $resultArr );
+ return false;
+ }
+
+ return true;
+ }
+
+ /**
+ * Hook for user creation form submissions.
+ * @param User $u
+ * @param string $message
+ * @param Status $status
+ * @return bool true to continue, false to abort user creation
+ */
+ function confirmUserCreate( $u, &$message, &$status = null ) {
+ if ( $this->needCreateAccountCaptcha() ) {
+ $this->trigger = "new account '" . $u->getName() . "'";
+ if ( !$this->passCaptchaLimited() ) {
+ // For older MediaWiki
+ $message = wfMessage( 'captcha-createaccount-fail' )->text();
+ // For MediaWiki 1.23+
+ $status = Status::newGood();
+
+ // Apply a *non*-fatal warning. This will still abort the
+ // account creation but returns a "Warning" response to the
+ // API or UI.
+ $status->warning( 'captcha-createaccount-fail' );
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Logic to check if we need to pass a captcha for the current user
+ * to create a new account, or not
+ *
+ * @return bool true to show captcha, false to skip captcha
+ */
+ function needCreateAccountCaptcha() {
+ global $wgCaptchaTriggers, $wgUser;
+ if ( $wgCaptchaTriggers['createaccount'] ) {
+ if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
+ wfDebug( "ConfirmEdit: user group allows skipping captcha on account creation\n" );
+ return false;
+ }
+ if ( $this->isIPWhitelisted() ) {
+ return false;
+ }
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Hook for user login form submissions.
+ * @param $u User
+ * @param $pass
+ * @param $retval
+ * @return bool true to continue, false to abort user creation
+ */
+ function confirmUserLogin( $u, $pass, &$retval ) {
+ if ( $this->isBadLoginTriggered() ) {
+ if ( $this->isIPWhitelisted() )
+ return true;
+
+ $this->trigger = "post-badlogin login '" . $u->getName() . "'";
+ if ( !$this->passCaptchaLimited() ) {
+ // Emulate a bad-password return to confuse the shit out of attackers
+ $retval = LoginForm::WRONG_PASS;
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Check the captcha on Special:EmailUser
+ * @param $from MailAddress
+ * @param $to MailAddress
+ * @param $subject String
+ * @param $text String
+ * @param $error String reference
+ * @return Bool true to continue saving, false to abort and show a captcha form
+ */
+ function confirmEmailUser( $from, $to, $subject, $text, &$error ) {
+ global $wgCaptchaTriggers, $wgUser;
+ if ( $wgCaptchaTriggers['sendemail'] ) {
+ if ( $wgUser->isAllowed( 'skipcaptcha' ) ) {
+ wfDebug( "ConfirmEdit: user group allows skipping captcha on email sending\n" );
+ return true;
+ }
+ if ( $this->isIPWhitelisted() )
+ return true;
+
+ if ( defined( 'MW_API' ) ) {
+ # API mode
+ # Asking for captchas in the API is really silly
+ $error = wfMessage( 'captcha-disabledinapi' )->text();
+ return false;
+ }
+ $this->trigger = "{$wgUser->getName()} sending email";
+ if ( !$this->passCaptchaLimited() ) {
+ $error = wfMessage( 'captcha-sendemail-fail' )->text();
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /**
+ * @param $module ApiBase
+ * @return bool
+ */
+ protected function isAPICaptchaModule( $module ) {
+ return $module instanceof ApiEditPage || $module instanceof ApiCreateAccount;
+ }
+
+ /**
+ * @param $module ApiBase
+ * @param $params array
+ * @param $flags int
+ * @return bool
+ */
+ public function APIGetAllowedParams( &$module, &$params, $flags ) {
+ if ( $this->isAPICaptchaModule( $module ) ) {
+ $params['captchaword'] = null;
+ $params['captchaid'] = null;
+ }
+
+ return true;
+ }
+
+ /**
+ * @param $module ApiBase
+ * @param $desc array
+ * @return bool
+ */
+ public function APIGetParamDescription( &$module, &$desc ) {
+ if ( $this->isAPICaptchaModule( $module ) ) {
+ $desc['captchaid'] = 'CAPTCHA ID from previous request';
+ $desc['captchaword'] = 'Answer to the CAPTCHA';
+ }
+
+ return true;
+ }
+
+ /**
+ * Checks, if the user reached the amount of false CAPTCHAs and give him some vacation
+ * or run self::passCaptcha() and clear counter if correct.
+ *
+ * @see self::passCaptcha()
+ */
+ private function passCaptchaLimited() {
+ global $wgUser;
+
+ // don't increase pingLimiter here, just check, if CAPTCHA limit exceeded
+ if ( $wgUser->pingLimiter( 'badcaptcha', 0 ) ) {
+ // for debugging add an proper error message, the user just see an false captcha error message
+ wfDebug( 'ConfirmEdit: User reached RateLimit, preventing action.' );
+ return false;
+ }
+
+ if ( $this->passCaptcha() ) {
+ return true;
+ }
+
+ // captcha was not solved: increase limit and return false
+ $wgUser->pingLimiter( 'badcaptcha' );
+ return false;
+ }
+
+ /**
+ * 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() {
+ global $wgRequest;
+
+ // Don't check the same CAPTCHA twice in one session, if the CAPTCHA was already checked - Bug T94276
+ if ( isset( $this->captchaSolved ) ) {
+ return $this->captchaSolved;
+ }
+
+ $info = $this->retrieveCaptcha( $wgRequest );
+ if ( $info ) {
+ global $wgRequest;
+ if ( $this->keyMatch( $wgRequest->getVal( 'wpCaptchaWord' ), $info ) ) {
+ $this->log( "passed" );
+ $this->clearCaptcha( $info );
+ $this->captchaSolved = true;
+ return true;
+ } else {
+ $this->clearCaptcha( $info );
+ $this->log( "bad form input" );
+ $this->captchaSolved = false;
+ 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() );
+ }
+ CaptchaStore::get()->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;
+ $index = $wgRequest->getVal( 'wpCaptchaId' );
+ return CaptchaStore::get()->retrieve( $index );
+ }
+
+ /**
+ * Clear out existing captcha info from the session, to ensure
+ * it can't be reused.
+ */
+ function clearCaptcha( $info ) {
+ CaptchaStore::get()->clear( $info['index'] );
+ }
+
+ /**
+ * Retrieve the current version of the page or section being edited...
+ * @param Title $title
+ * @param string $section
+ * @param integer $flags Flags for Revision loading methods
+ * @return string
+ * @access private
+ */
+ function loadText( $title, $section, $flags = Revision::READ_LATEST ) {
+ $rev = Revision::newFromTitle( $title, false, $flags );
+ if ( is_null( $rev ) ) {
+ return "";
+ } else {
+ $text = $rev->getText();
+ if ( $section != '' ) {
+ global $wgParser;
+ return $wgParser->getSection( $text, $section );
+ } else {
+ return $text;
+ }
+ }
+ }
+
+ /**
+ * Extract a list of all recognized HTTP links in the text.
+ * @param $title Title
+ * @param $text string
+ * @return array of strings
+ */
+ function findLinks( $title, $text ) {
+ global $wgParser, $wgUser;
+
+ $options = new ParserOptions();
+ $text = $wgParser->preSaveTransform( $text, $title, $wgUser, $options );
+ $out = $wgParser->parse( $text, $title, $options );
+
+ return array_keys( $out->getExternalLinks() );
+ }
+
+ /**
+ * Show a page explaining what this wacky thing is.
+ */
+ function showHelp() {
+ global $wgOut;
+ $wgOut->setPageTitle( wfMessage( 'captchahelp-title' )->text() );
+ $wgOut->addWikiMsg( 'captchahelp-text' );
+ if ( CaptchaStore::get()->cookiesNeeded() ) {
+ $wgOut->addWikiMsg( 'captchahelp-cookies-needed' );
+ }
+ }
+
+ /**
+ * Pass API captcha parameters on to the login form when using
+ * API account creation.
+ *
+ * @param ApiCreateAccount $apiModule
+ * @param LoginForm $loginForm
+ * @return hook return value
+ */
+ function addNewAccountApiForm( $apiModule, $loginForm ) {
+ global $wgRequest;
+ $main = $apiModule->getMain();
+
+ $id = $main->getVal( 'captchaid' );
+ if ( $id ) {
+ $wgRequest->setVal( 'wpCaptchaId', $id );
+
+ // Suppress "unrecognized parameter" warning:
+ $main->getVal( 'wpCaptchaId' );
+ }
+
+ $word = $main->getVal( 'captchaword' );
+ if ( $word ) {
+ $wgRequest->setVal( 'wpCaptchaWord', $word );
+
+ // Suppress "unrecognized parameter" warning:
+ $main->getVal( 'wpCaptchaWord' );
+ }
+
+ return true;
+ }
+
+ /**
+ * Pass extra data back in API results for account creation.
+ *
+ * @param ApiCreateAccount $apiModule
+ * @param LoginForm &loginPage
+ * @param array &$result
+ * @return bool: Hook return value
+ */
+ function addNewAccountApiResult( $apiModule, $loginPage, &$result ) {
+ if ( $result['result'] !== 'Success' && $this->needCreateAccountCaptcha() ) {
+
+ // If we failed a captcha, override the generic 'Warning' result string
+ if ( $result['result'] === 'Warning' && isset( $result['warnings'] ) ) {
+ foreach ( $result['warnings'] as $warning ) {
+ if ( $warning['message'] === 'captcha-createaccount-fail' ) {
+ $this->addCaptchaAPI( $result );
+ $result['result'] = 'NeedCaptcha';
+ }
+ }
+ }
+ }
+ return true;
+ }
+}