Current File : /www/varak.net/wiki.varak.net/extensions/ConfirmEdit/SimpleCaptcha/SimpleCaptcha.php
<?php
use MediaWiki\Auth\AuthenticationRequest;
/**
* Demo CAPTCHA (not for production usage) and base class for real CAPTCHAs
*/
class SimpleCaptcha {
protected static $messagePrefix = 'captcha-';
/** @var boolean|null Was the CAPTCHA already passed and if yes, with which result? */
private $captchaSolved = null;
/**
* Used to select the right message.
* One of sendmail, createaccount, badlogin, edit, create, addurl.
* @var string
*/
protected $action;
/** @var string Used in log messages. */
protected $trigger;
/**
* @param string $action
*/
public function setAction( $action ) {
$this->action = $action;
}
/**
* @param string $trigger
*/
public function setTrigger( $trigger ) {
$this->trigger = $trigger;
}
/**
* Return the error from the last passCaptcha* call.
* Not implemented but needed by some child classes.
* @return mixed
*/
public function getError() {
return null;
}
/**
* Returns an array with 'question' and 'answer' keys.
* Subclasses might use different structure.
* Since MW 1.27 all subclasses must implement this method.
* @return array
*/
public 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 [ 'question' => $test, 'answer' => $answer ];
}
/**
* @param array &$resultArr
*/
protected function addCaptchaAPI( &$resultArr ) {
$captcha = $this->getCaptcha();
$index = $this->storeCaptcha( $captcha );
$resultArr['captcha'] = $this->describeCaptchaType();
$resultArr['captcha']['id'] = $index;
$resultArr['captcha']['question'] = $captcha['question'];
}
/**
* Describes the captcha type for API clients.
* @return array An array with keys 'type' and 'mime', and possibly other
* implementation-specific
*/
public function describeCaptchaType() {
return [
'type' => 'simple',
'mime' => 'text/plain',
];
}
/**
* 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!
*
* It is not guaranteed that the CAPTCHA will load synchronously with the main page
* content. So you can not rely on registering handlers before page load. E.g.:
*
* NOT SAFE: $( window ).on( 'load', handler )
* SAFE: $( handler )
*
* However, if the HTML is loaded dynamically via AJAX, the following order will
* be used.
*
* headitems => modulestyles + modules => add main HTML to DOM when modulestyles +
* modules are ready.
*
* @param int $tabIndex Tab index to start from
*
* @return array Associative array with the following keys:
* string html - Main HTML
* array modules (optional) - Array of ResourceLoader module names
* array modulestyles (optional) - Array of ResourceLoader module names to be
* included as style-only modules.
* array headitems (optional) - Head items (see OutputPage::addHeadItems), as a numeric array
* of raw HTML strings. Do not use unless no other option is feasible.
*/
public function getFormInformation( $tabIndex = 1 ) {
$captcha = $this->getCaptcha();
$index = $this->storeCaptcha( $captcha );
return [
'html' => "<p><label for=\"wpCaptchaWord\">{$captcha['question']} = </label>" .
Xml::element( 'input', [
'name' => 'wpCaptchaWord',
'class' => 'mw-ui-input',
'id' => 'wpCaptchaWord',
'size' => 5,
'autocomplete' => 'off',
// tab in before the edit textarea
'tabindex' => $tabIndex ] ) .
"</p>\n" .
Xml::element( 'input', [
'type' => 'hidden',
'name' => 'wpCaptchaId',
'id' => 'wpCaptchaId',
'value' => $index ] )
];
}
/**
* Uses getFormInformation() to get the CAPTCHA form and adds it to the given
* OutputPage object.
*
* @param OutputPage $out The OutputPage object to which the form should be added
* @param int $tabIndex See self::getFormInformation
*/
public function addFormToOutput( OutputPage $out, $tabIndex = 1 ) {
$this->addFormInformationToOutput( $out, $this->getFormInformation( $tabIndex ) );
}
/**
* Processes the given $formInformation array and adds the options (see getFormInformation())
* to the given OutputPage object.
*
* @param OutputPage $out The OutputPage object to which the form should be added
* @param array $formInformation
*/
public function addFormInformationToOutput( OutputPage $out, array $formInformation ) {
if ( !$formInformation ) {
return;
}
if ( isset( $formInformation['html'] ) ) {
$out->addHTML( $formInformation['html'] );
}
if ( isset( $formInformation['modules'] ) ) {
$out->addModules( $formInformation['modules'] );
}
if ( isset( $formInformation['modulestyles'] ) ) {
$out->addModuleStyles( $formInformation['modulestyles'] );
}
if ( isset( $formInformation['headitems'] ) ) {
$out->addHeadItems( $formInformation['headitems'] );
}
}
/**
* @param array $captchaData Data given by getCaptcha
* @param string $id ID given by storeCaptcha
* @return string Description of the captcha. Format is not specified; could be text, HTML, URL...
*/
public function getCaptchaInfo( $captchaData, $id ) {
return $captchaData['question'] . ' =';
}
/**
* Show error message for missing or incorrect captcha on EditPage.
* @param EditPage &$editPage
* @param OutputPage &$out
*/
public function showEditFormFields( &$editPage, &$out ) {
$page = $editPage->getArticle()->getPage();
if ( !isset( $page->ConfirmEdit_ActivateCaptcha ) ) {
return;
}
if ( $this->action !== 'edit' ) {
unset( $page->ConfirmEdit_ActivateCaptcha );
$out->addWikiMsg( $this->getMessage( $this->action )->getKey() );
$this->addFormToOutput( $out );
}
}
/**
* Insert the captcha prompt into an edit form.
* @param EditPage $editPage
*/
public function editShowCaptcha( $editPage ) {
$context = $editPage->getArticle()->getContext();
$page = $editPage->getArticle()->getPage();
$out = $context->getOutput();
if ( isset( $page->ConfirmEdit_ActivateCaptcha ) ||
$this->shouldCheck( $page, '', '', $context )
) {
$out->addWikiMsg( $this->getMessage( $this->action )->getKey() );
$this->addFormToOutput( $out );
}
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 string $action Action being performed
* @return Message
*/
public function getMessage( $action ) {
// one of captcha-edit, captcha-addurl, captcha-badlogin, captcha-createaccount,
// captcha-create, captcha-sendemail
$name = static::$messagePrefix . $action;
$msg = wfMessage( $name );
// obtain a more tailored message, if possible, otherwise, fall back to
// the default for edits
return $msg->isDisabled() ? wfMessage( static::$messagePrefix . 'edit' ) : $msg;
}
/**
* Inject whazawhoo
* @fixme if multiple thingies insert a header, could break
* @param HTMLForm &$form
* @return bool true to keep running callbacks
*/
public function injectEmailUser( &$form ) {
$out = $form->getOutput();
$user = $form->getUser();
if ( $this->triggersCaptcha( CaptchaTriggers::SENDEMAIL ) ) {
$this->action = 'sendemail';
if ( $this->canSkipCaptcha( $user, $form->getConfig() ) ) {
return true;
}
$formInformation = $this->getFormInformation();
$formMetainfo = $formInformation;
unset( $formMetainfo['html'] );
$this->addFormInformationToOutput( $out, $formMetainfo );
$form->addFooterText(
"<div class='captcha'>" .
$out->parse( $this->getMessage( 'sendemail' )->plain() ) .
$formInformation['html'] .
"</div>\n" );
}
return true;
}
/**
* Increase bad login counter after a failed login.
* The user might be required to solve a captcha if the count is high.
* @param string $username
* TODO use Throttler
*/
public function increaseBadLoginCounter( $username ) {
global $wgCaptchaBadLoginExpiration, $wgCaptchaBadLoginPerUserExpiration;
$cache = ObjectCache::getLocalClusterInstance();
if ( $this->triggersCaptcha( CaptchaTriggers::BAD_LOGIN ) ) {
$key = $this->badLoginKey();
$count = ObjectCache::getLocalClusterInstance()->get( $key );
if ( !$count ) {
$cache->add( $key, 0, $wgCaptchaBadLoginExpiration );
}
$cache->incr( $key );
}
if ( $this->triggersCaptcha( CaptchaTriggers::BAD_LOGIN_PER_USER ) && $username ) {
$key = $this->badLoginPerUserKey( $username );
$count = $cache->get( $key );
if ( !$count ) {
$cache->add( $key, 0, $wgCaptchaBadLoginPerUserExpiration );
}
$cache->incr( $key );
}
}
/**
* Reset bad login counter after a successful login.
* @param string $username
*/
public function resetBadLoginCounter( $username ) {
if ( $this->triggersCaptcha( CaptchaTriggers::BAD_LOGIN_PER_USER ) && $username ) {
$cache = ObjectCache::getLocalClusterInstance();
$cache->delete( $this->badLoginPerUserKey( $username ) );
}
}
/**
* Check if a bad login has already been registered for this
* IP address. If so, require a captcha.
* @return bool
* @access private
*/
public function isBadLoginTriggered() {
global $wgCaptchaBadLoginAttempts;
$cache = ObjectCache::getLocalClusterInstance();
return $this->triggersCaptcha( CaptchaTriggers::BAD_LOGIN )
&& (int)$cache->get( $this->badLoginKey() ) >= $wgCaptchaBadLoginAttempts;
}
/**
* Is the per-user captcha triggered?
*
* @param User|string $u User object, or name
* @return bool|null False: no, null: no, but it will be triggered next time
*/
public function isBadLoginPerUserTriggered( $u ) {
global $wgCaptchaBadLoginPerUserAttempts;
$cache = ObjectCache::getLocalClusterInstance();
if ( is_object( $u ) ) {
$u = $u->getName();
}
return $this->triggersCaptcha( CaptchaTriggers::BAD_LOGIN_PER_USER )
&& (int)$cache->get( $this->badLoginPerUserKey( $u ) ) >= $wgCaptchaBadLoginPerUserAttempts;
}
/**
* Check if the current IP is allowed to skip captchas. This checks
* the whitelist from two sources.
* 1) From the server-side config array $wgCaptchaWhitelistIP
* 2) From the local [[MediaWiki:Captcha-ip-whitelist]] message
*
* @return bool true if whitelisted, false if not
*/
private function isIPWhitelisted() {
global $wgCaptchaWhitelistIP, $wgRequest;
$ip = $wgRequest->getIP();
if ( $wgCaptchaWhitelistIP ) {
if ( IP::isInRanges( $ip, $wgCaptchaWhitelistIP ) ) {
return true;
}
}
$whitelistMsg = wfMessage( 'captcha-ip-whitelist' )->inContentLanguage();
if ( !$whitelistMsg->isDisabled() ) {
$whitelistedIPs = $this->getWikiIPWhitelist( $whitelistMsg );
if ( IP::isInRanges( $ip, $whitelistedIPs ) ) {
return true;
}
}
return false;
}
/**
* Get the on-wiki IP whitelist stored in [[MediaWiki:Captcha-ip-whitelist]]
* page from cache if possible.
*
* @param Message $msg whitelist Message on wiki
* @return array whitelisted IP addresses or IP ranges, empty array if no whitelist
*/
private function getWikiIPWhitelist( Message $msg ) {
$cache = ObjectCache::getMainWANInstance();
$cacheKey = $cache->makeKey( 'confirmedit', 'ipwhitelist' );
$cachedWhitelist = $cache->get( $cacheKey );
if ( $cachedWhitelist === false ) {
// Could not retrieve from cache so build the whitelist directly
// from the wikipage
$whitelist = $this->buildValidIPs(
explode( "\n", $msg->plain() )
);
// And then store it in cache for one day. This cache is cleared on
// modifications to the whitelist page.
// @see ConfirmEditHooks::onPageContentSaveComplete()
$cache->set( $cacheKey, $whitelist, 86400 );
} else {
// Whitelist from the cache
$whitelist = $cachedWhitelist;
}
return $whitelist;
}
/**
* From a list of unvalidated input, get all the valid
* IP addresses and IP ranges from it.
*
* Note that only lines with just the IP address or IP range is considered
* as valid. Whitespace is allowed but if there is any other character on
* the line, it's not considered as a valid entry.
*
* @param string[] $input
* @return string[] of valid IP addresses and IP ranges
*/
private function buildValidIPs( array $input ) {
// Remove whitespace and blank lines first
$ips = array_map( 'trim', $input );
$ips = array_filter( $ips );
$validIPs = [];
foreach ( $ips as $ip ) {
if ( IP::isIPAddress( $ip ) ) {
$validIPs[] = $ip;
}
}
return $validIPs;
}
/**
* Internal cache key for badlogin checks.
* @return string
*/
private function badLoginKey() {
global $wgRequest;
$ip = $wgRequest->getIP();
return wfGlobalCacheKey( 'captcha', 'badlogin', 'ip', $ip );
}
/**
* Cache key for badloginPerUser checks.
* @param string $username
* @return string
*/
private function badLoginPerUserKey( $username ) {
$username = User::getCanonicalName( $username, 'usable' ) ?: $username;
return wfGlobalCacheKey( 'captcha', 'badlogin', 'user', md5( $username ) );
}
/**
* 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
*/
protected 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
* @deprecated since 1.5.1 Use triggersCaptcha instead
*/
public function captchaTriggers( $title, $action ) {
return $this->triggersCaptcha( $action, $title );
}
/**
* Checks, whether the passed action should trigger a CAPTCHA. The optional $title parameter
* will be used to check namespace specific CAPTCHA triggers.
*
* @param string $action The CAPTCHA trigger to check (see CaptchaTriggers for ConfirmEdit
* built-in triggers)
* @param Title|null $title An optional Title object, if the namespace specific triggers
* should be checked, too.
* @return bool True, if the action should trigger a CAPTCHA, false otherwise
*/
public function triggersCaptcha( $action, $title = null ) {
global $wgCaptchaTriggers, $wgCaptchaTriggersOnNamespace;
$result = false;
$triggers = $wgCaptchaTriggers;
$attributeCaptchaTriggers = ExtensionRegistry::getInstance()
->getAttribute( CaptchaTriggers::EXT_REG_ATTRIBUTE_NAME );
if ( is_array( $attributeCaptchaTriggers ) ) {
$triggers += $attributeCaptchaTriggers;
}
if ( isset( $triggers[$action] ) ) {
$result = $triggers[$action];
}
if (
$title !== null &&
isset( $wgCaptchaTriggersOnNamespace[$title->getNamespace()][$action] )
) {
$result = $wgCaptchaTriggersOnNamespace[$title->getNamespace()][$action];
}
return $result;
}
/**
* @param WikiPage $page
* @param Content|string $content
* @param string $section
* @param IContextSource $context
* @param string|null $oldtext 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
*/
public function shouldCheck( WikiPage $page, $content, $section, $context, $oldtext = null ) {
if ( !$context instanceof IContextSource ) {
$context = RequestContext::getMain();
}
$request = $context->getRequest();
$user = $context->getUser();
if ( $this->canSkipCaptcha( $user, $context->getConfig() ) ) {
return false;
}
$title = $page->getTitle();
$this->trigger = '';
if ( $content instanceof Content ) {
if ( $content->getModel() == CONTENT_MODEL_WIKITEXT ) {
$newtext = $content->getNativeData();
} else {
$newtext = null;
}
$isEmpty = $content->isEmpty();
} else {
$newtext = $content;
$isEmpty = $content === '';
}
if ( $this->triggersCaptcha( 'edit', $title ) ) {
// Check on all edits
$this->trigger = sprintf( "edit trigger by '%s' at [[%s]]",
$user->getName(),
$title->getPrefixedText() );
$this->action = 'edit';
wfDebug( "ConfirmEdit: checking all edits...\n" );
return true;
}
if ( $this->triggersCaptcha( 'create', $title ) && !$title->exists() ) {
// Check if creating a page
$this->trigger = sprintf( "Create trigger by '%s' at [[%s]]",
$user->getName(),
$title->getPrefixedText() );
$this->action = 'create';
wfDebug( "ConfirmEdit: checking on page creation...\n" );
return true;
}
// The following checks are expensive and should be done only,
// if we can assume, that the edit will be saved
if ( !$request->wasPosted() ) {
wfDebug(
"ConfirmEdit: request not posted, assuming that no content will be saved -> no CAPTCHA check"
);
return false;
}
if ( !$isEmpty && $this->triggersCaptcha( 'addurl', $title ) ) {
// Only check edits that add URLs
if ( $content instanceof Content ) {
// 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 = [];
}
} else {
// Get link changes in the slowest way known to man
$oldtext = isset( $oldtext ) ? $oldtext : $this->loadText( $title, $section );
$oldLinks = $this->findLinks( $title, $oldtext );
$newLinks = $this->findLinks( $title, $newtext );
}
$unknownLinks = array_filter( $newLinks, [ $this, 'filterLink' ] );
$addedLinks = array_diff( $unknownLinks, $oldLinks );
$numLinks = count( $addedLinks );
if ( $numLinks > 0 ) {
$this->trigger = sprintf( "%dx url trigger by '%s' at [[%s]]: %s",
$numLinks,
$user->getName(),
$title->getPrefixedText(),
implode( ", ", $addedLinks ) );
$this->action = 'addurl';
return true;
}
}
global $wgCaptchaRegexes;
if ( $newtext !== null && $wgCaptchaRegexes ) {
if ( !is_array( $wgCaptchaRegexes ) ) {
throw new UnexpectedValueException(
'$wgCaptchaRegexes is required to be an array, ' . gettype( $wgCaptchaRegexes ) . ' given.'
);
}
// Custom regex checks. Reuse $oldtext if set above.
$oldtext = isset( $oldtext ) ? $oldtext : $this->loadText( $title, $section );
foreach ( $wgCaptchaRegexes as $regex ) {
$newMatches = [];
if ( preg_match_all( $regex, $newtext, $newMatches ) ) {
$oldMatches = [];
preg_match_all( $regex, $oldtext, $oldMatches );
$addedMatches = array_diff( $newMatches[0], $oldMatches[0] );
$numHits = count( $addedMatches );
if ( $numHits > 0 ) {
$this->trigger = sprintf( "%dx %s at [[%s]]: %s",
$numHits,
$regex,
$user->getName(),
$title->getPrefixedText(),
implode( ", ", $addedMatches ) );
$this->action = 'edit';
return true;
}
}
}
}
return false;
}
/**
* Filter callback function for URL whitelisting
* @param string $url string to check
* @return bool true if unknown, false if whitelisted
*/
private function filterLink( $url ) {
global $wgCaptchaWhitelist;
static $regexes = null;
if ( $regexes === null ) {
$source = wfMessage( 'captcha-addurl-whitelist' )->inContentLanguage();
$regexes = $source->isDisabled()
? []
: $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 string $lines string from [[MediaWiki:Captcha-addurl-whitelist]]
* @return array Regexes
* @access private
*/
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 [];
} 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 = [
'normal' => '/^(?:https?:)?\/\/+[a-z0-9_\-.]*(?:',
'noprotocol' => '/^(?:',
];
$regexEnd = [
'normal' => ')/Si',
'noprotocol' => ')/Si',
];
$regexMax = 4096;
$build = [];
foreach ( $lines as $line ) {
# Extract flags from the line
$options = [];
if ( preg_match( '/^(.*?)\s*<([^<>]*)>$/', $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
*/
private function getLinksFromTracker( $title ) {
$dbr = wfGetDB( DB_REPLICA );
// should be zero queries
$id = $title->getArticleID();
$res = $dbr->select( 'externallinks', [ 'el_to' ],
[ 'el_from' => $id ], __METHOD__ );
$links = [];
foreach ( $res as $row ) {
$links[] = $row->el_to;
}
return $links;
}
/**
* Backend function for confirmEditMerged()
* @param WikiPage $page
* @param string $newtext
* @param string $section
* @param IContextSource $context
* @return bool false if the CAPTCHA is rejected, true otherwise
*/
private function doConfirmEdit( WikiPage $page, $newtext, $section, IContextSource $context ) {
global $wgUser, $wgRequest;
$request = $context->getRequest();
// FIXME: Stop using wgRequest in other parts of ConfirmEdit so we can
// stop having to duplicate code for it.
if ( $request->getVal( 'captchaid' ) ) {
$request->setVal( 'wpCaptchaId', $request->getVal( 'captchaid' ) );
$wgRequest->setVal( 'wpCaptchaId', $request->getVal( 'captchaid' ) );
}
if ( $request->getVal( 'captchaword' ) ) {
$request->setVal( 'wpCaptchaWord', $request->getVal( 'captchaword' ) );
$wgRequest->setVal( 'wpCaptchaWord', $request->getVal( 'captchaword' ) );
}
if ( $this->shouldCheck( $page, $newtext, $section, $context ) ) {
return $this->passCaptchaLimitedFromRequest( $wgRequest, $wgUser );
} 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 string $summary
* @param User $user
* @param bool $minorEdit
* @return bool
*/
public function confirmEditMerged( $context, $content, $status, $summary, $user, $minorEdit ) {
if ( !$context->canUseWikiPage() ) {
// we check WikiPage only
// try to get an appropriate title for this page
$title = $context->getTitle();
if ( $title instanceof Title ) {
$title = $title->getFullText();
} else {
// otherwise it's an unknown page where this function is called from
$title = 'unknown';
}
// log this error, it could be a problem in another extension,
// edits should always have a WikiPage if
// they go through EditFilterMergedContent.
wfDebug( __METHOD__ . ': Skipped ConfirmEdit check: No WikiPage for title ' . $title );
return true;
}
$page = $context->getWikiPage();
if ( !$this->doConfirmEdit( $page, $content, false, $context ) ) {
$status->value = EditPage::AS_HOOK_ERROR_EXPECTED;
$status->apiHookResult = [];
// give an error message for the user to know, what goes wrong here.
// this can't be done for addurl trigger, because this requires one "free" save
// for the user, which we don't know, when he did it.
if ( $this->action === 'edit' ) {
$status->fatal(
new RawMessage(
Html::element(
'div',
[ 'class' => 'errorbox' ],
$context->msg( 'captcha-edit-fail' )->text()
)
)
);
}
$this->addCaptchaAPI( $status->apiHookResult );
$page->ConfirmEdit_ActivateCaptcha = true;
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
*
* @param User|null $creatingUser
* @return bool true to show captcha, false to skip captcha
*/
public function needCreateAccountCaptcha( User $creatingUser = null ) {
global $wgUser;
$creatingUser = $creatingUser ?: $wgUser;
if ( $this->triggersCaptcha( CaptchaTriggers::CREATE_ACCOUNT ) ) {
if ( $this->canSkipCaptcha( $creatingUser,
\MediaWiki\MediaWikiServices::getInstance()->getMainConfig() ) ) {
return false;
}
return true;
}
return false;
}
/**
* Check the captcha on Special:EmailUser
* @param MailAddress $from
* @param MailAddress $to
* @param string $subject
* @param string $text
* @param string &$error
* @return bool true to continue saving, false to abort and show a captcha form
*/
public function confirmEmailUser( $from, $to, $subject, $text, &$error ) {
global $wgUser, $wgRequest;
if ( $this->triggersCaptcha( CaptchaTriggers::SENDEMAIL ) ) {
if ( $this->canSkipCaptcha( $wgUser,
\MediaWiki\MediaWikiServices::getInstance()->getMainConfig() ) ) {
return true;
}
if ( defined( 'MW_API' ) ) {
# API mode
# Asking for captchas in the API is really silly
$error = Status::newFatal( 'captcha-disabledinapi' );
return false;
}
$this->trigger = "{$wgUser->getName()} sending email";
if ( !$this->passCaptchaLimitedFromRequest( $wgRequest, $wgUser ) ) {
$error = Status::newFatal( 'captcha-sendemail-fail' );
return false;
}
}
return true;
}
/**
* @param ApiBase $module
* @return bool
*/
protected function isAPICaptchaModule( $module ) {
return $module instanceof ApiEditPage;
}
/**
* @param ApiBase &$module
* @param array &$params
* @param int $flags
* @return bool
*/
public function apiGetAllowedParams( &$module, &$params, $flags ) {
if ( $this->isAPICaptchaModule( $module ) ) {
$params['captchaword'] = [
ApiBase::PARAM_HELP_MSG => 'captcha-apihelp-param-captchaword',
];
$params['captchaid'] = [
ApiBase::PARAM_HELP_MSG => 'captcha-apihelp-param-captchaid',
];
}
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.
*
* @param WebRequest $request
* @param User $user
* @return bool
*/
public function passCaptchaLimitedFromRequest( WebRequest $request, User $user ) {
list( $index, $word ) = $this->getCaptchaParamsFromRequest( $request );
return $this->passCaptchaLimited( $index, $word, $user );
}
/**
* @param WebRequest $request
* @return array [ captcha ID, captcha solution ]
*/
protected function getCaptchaParamsFromRequest( WebRequest $request ) {
$index = $request->getVal( 'wpCaptchaId' );
$word = $request->getVal( 'wpCaptchaWord' );
return [ $index, $word ];
}
/**
* Checks, if the user reached the amount of false CAPTCHAs and give him some vacation
* or run self::passCaptcha() and clear counter if correct.
*
* @param string $index Captcha idenitifier
* @param string $word Captcha solution
* @param User $user User for throttling captcha solving attempts
* @return bool
* @see self::passCaptcha()
*/
public function passCaptchaLimited( $index, $word, User $user ) {
// don't increase pingLimiter here, just check, if CAPTCHA limit exceeded
if ( $user->pingLimiter( 'badcaptcha', 0 ) ) {
// for debugging add an proper error message, the user just see an false captcha error message
$this->log( 'User reached RateLimit, preventing action' );
return false;
}
if ( $this->passCaptcha( $index, $word ) ) {
return true;
}
// captcha was not solved: increase limit and return false
$user->pingLimiter( 'badcaptcha' );
return false;
}
/**
* Given a required captcha run, test form input for correct
* input on the open session.
* @param WebRequest $request
* @param User $user
* @return bool if passed, false if failed or new session
*/
public function passCaptchaFromRequest( WebRequest $request, User $user ) {
list( $index, $word ) = $this->getCaptchaParamsFromRequest( $request );
return $this->passCaptcha( $index, $word );
}
/**
* Given a required captcha run, test form input for correct
* input on the open session.
* @param string $index Captcha idenitifier
* @param string $word Captcha solution
* @return bool if passed, false if failed or new session
*/
protected function passCaptcha( $index, $word ) {
// 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( $index );
if ( $info ) {
if ( $this->keyMatch( $word, $info ) ) {
$this->log( "passed" );
$this->clearCaptcha( $index );
$this->captchaSolved = true;
return true;
} else {
$this->clearCaptcha( $index );
$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
*/
protected 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
*/
public 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.
* @param string $index
* @return array|false array of info, or false if missing
*/
public function retrieveCaptcha( $index ) {
return CaptchaStore::get()->retrieve( $index );
}
/**
* Clear out existing captcha info from the session, to ensure
* it can't be reused.
* @param string $index
*/
public function clearCaptcha( $index ) {
CaptchaStore::get()->clear( $index );
}
/**
* Retrieve the current version of the page or section being edited...
* @param Title $title
* @param string $section
* @param int $flags Flags for Revision loading methods
* @return string
* @access private
*/
private function loadText( $title, $section, $flags = Revision::READ_LATEST ) {
global $wgParser;
$rev = Revision::newFromTitle( $title, false, $flags );
if ( is_null( $rev ) ) {
return "";
}
$content = $rev->getContent();
$text = ContentHandler::getContentText( $content );
if ( $section !== '' ) {
return $wgParser->getSection( $text, $section );
}
return $text;
}
/**
* Extract a list of all recognized HTTP links in the text.
* @param Title $title
* @param string $text
* @return array of strings
*/
private 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.
*/
public function showHelp() {
global $wgOut;
$wgOut->setPageTitle( wfMessage( 'captchahelp-title' )->text() );
$wgOut->addWikiMsg( 'captchahelp-text' );
if ( CaptchaStore::get()->cookiesNeeded() ) {
$wgOut->addWikiMsg( 'captchahelp-cookies-needed' );
}
}
/**
* @return CaptchaAuthenticationRequest
*/
public function createAuthenticationRequest() {
$captchaData = $this->getCaptcha();
$id = $this->storeCaptcha( $captchaData );
return new CaptchaAuthenticationRequest( $id, $captchaData );
}
/**
* Modify the appearance of the captcha field
* @param AuthenticationRequest[] $requests
* @param array $fieldInfo Field description as given by AuthenticationRequest::mergeFieldInfo
* @param array &$formDescriptor A form descriptor suitable for the HTMLForm constructor
* @param string $action One of the AuthManager::ACTION_* constants
*/
public function onAuthChangeFormFields(
array $requests, array $fieldInfo, array &$formDescriptor, $action
) {
$req = AuthenticationRequest::getRequestByClass( $requests,
CaptchaAuthenticationRequest::class );
if ( !$req ) {
return;
}
$formDescriptor['captchaWord'] = [
'label-message' => null,
'autocomplete' => false,
'persistent' => false,
'required' => true,
] + $formDescriptor['captchaWord'];
}
/**
* Check whether the user provided / IP making the request is allowed to skip captchas
* @param User $user
* @param Config $config
* @return bool
* @throws ConfigException
*/
public function canSkipCaptcha( $user, Config $config ) {
$allowConfirmEmail = $config->get( 'AllowConfirmedEmail' );
if ( $user->isAllowed( 'skipcaptcha' ) ) {
wfDebug( "ConfirmEdit: user group allows skipping captcha\n" );
return true;
}
if ( $this->isIPWhitelisted() ) {
wfDebug( "ConfirmEdit: user IP is whitelisted" );
return true;
}
if ( $allowConfirmEmail && $user->isEmailConfirmed() ) {
wfDebug( "ConfirmEdit: user has confirmed mail, skipping captcha\n" );
return true;
}
return false;
}
}
Mini Shell