mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/ConfirmEdit
synced 2024-11-25 16:48:40 +00:00
471 lines
14 KiB
PHP
471 lines
14 KiB
PHP
<?php
|
|
|
|
use MediaWiki\Auth\AuthenticationRequest;
|
|
use MediaWiki\Auth\AuthManager;
|
|
|
|
/**
|
|
* FancyCaptcha for displaying captchas precomputed by captcha.py
|
|
*/
|
|
class FancyCaptcha extends SimpleCaptcha {
|
|
// used for fancycaptcha-edit, fancycaptcha-addurl, fancycaptcha-badlogin,
|
|
// fancycaptcha-accountcreate, fancycaptcha-create, fancycaptcha-sendemail via getMessage()
|
|
protected static $messagePrefix = 'fancycaptcha-';
|
|
|
|
/**
|
|
* @return FileBackend
|
|
*/
|
|
public function getBackend() {
|
|
global $wgCaptchaFileBackend, $wgCaptchaDirectory;
|
|
|
|
if ( $wgCaptchaFileBackend ) {
|
|
return FileBackendGroup::singleton()->get( $wgCaptchaFileBackend );
|
|
} else {
|
|
static $backend = null;
|
|
if ( !$backend ) {
|
|
$backend = new FSFileBackend( [
|
|
'name' => 'captcha-backend',
|
|
'wikiId' => wfWikiID(),
|
|
'lockManager' => new NullLockManager( [] ),
|
|
'containerPaths' => [ 'captcha-render' => $wgCaptchaDirectory ],
|
|
'fileMode' => 777,
|
|
'obResetFunc' => 'wfResetOutputBuffers',
|
|
'streamMimeFunc' => [ 'StreamFile', 'contentTypeFromPath' ]
|
|
] );
|
|
}
|
|
return $backend;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @deprecated Use getCaptchaCount instead for an accurate figure
|
|
* @return int Number of captcha files
|
|
*/
|
|
public function estimateCaptchaCount() {
|
|
wfDeprecated( __METHOD__ );
|
|
return $this->getCaptchaCount();
|
|
}
|
|
|
|
/**
|
|
* @return int Number of captcha files
|
|
*/
|
|
public function getCaptchaCount() {
|
|
$backend = $this->getBackend();
|
|
$files = $backend->getFileList(
|
|
[ 'dir' => $backend->getRootStoragePath() . '/captcha-render' ]
|
|
);
|
|
|
|
return iterator_count( $files );
|
|
}
|
|
|
|
/**
|
|
* Check if the submitted form matches the captcha session data provided
|
|
* by the plugin when the form was generated.
|
|
*
|
|
* @param string $answer
|
|
* @param array $info
|
|
* @return bool
|
|
*/
|
|
function keyMatch( $answer, $info ) {
|
|
global $wgCaptchaSecret;
|
|
|
|
$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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param array $resultArr
|
|
*/
|
|
function addCaptchaAPI( &$resultArr ) {
|
|
$info = $this->pickImage();
|
|
if ( !$info ) {
|
|
$resultArr['captcha']['error'] = 'Out of images';
|
|
return;
|
|
}
|
|
$index = $this->storeCaptcha( $info );
|
|
$title = SpecialPage::getTitleFor( 'Captcha', 'image' );
|
|
$resultArr['captcha'] = $this->describeCaptchaType();
|
|
$resultArr['captcha']['id'] = $index;
|
|
$resultArr['captcha']['url'] = $title->getLocalURL( 'wpCaptchaId=' . urlencode( $index ) );
|
|
}
|
|
|
|
/**
|
|
* @return array
|
|
*/
|
|
public function describeCaptchaType() {
|
|
return [
|
|
'type' => 'image',
|
|
'mime' => 'image/png',
|
|
];
|
|
}
|
|
|
|
/**
|
|
* @param int $tabIndex
|
|
* @return array
|
|
*/
|
|
function getFormInformation( $tabIndex = 1 ) {
|
|
global $wgEnableAPI;
|
|
$modules = [];
|
|
|
|
$title = SpecialPage::getTitleFor( 'Captcha', 'image' );
|
|
$info = $this->getCaptcha();
|
|
$index = $this->storeCaptcha( $info );
|
|
|
|
if ( $wgEnableAPI ) {
|
|
// Loaded only if JS is enabled
|
|
$modules[] = 'ext.confirmEdit.fancyCaptcha';
|
|
|
|
$captchaReload = Html::element(
|
|
'small',
|
|
[
|
|
'class' => 'confirmedit-captcha-reload fancycaptcha-reload'
|
|
],
|
|
wfMessage( 'fancycaptcha-reload-text' )->text()
|
|
);
|
|
} else {
|
|
$captchaReload = '';
|
|
}
|
|
|
|
$form = Html::openElement( 'div' ) .
|
|
Html::element( 'label', [
|
|
'for' => 'wpCaptchaWord',
|
|
],
|
|
wfMessage( 'captcha-label' )->text() . ' ' . wfMessage( 'fancycaptcha-captcha' )->text()
|
|
) .
|
|
Html::openElement( 'div', [ 'class' => 'fancycaptcha-captcha-container' ] ) .
|
|
Html::openElement( 'div', [ 'class' => 'fancycaptcha-captcha-and-reload' ] ) .
|
|
Html::openElement( 'div', [ 'class' => 'fancycaptcha-image-container' ] ) .
|
|
Html::element( 'img', [
|
|
'class' => 'fancycaptcha-image',
|
|
'src' => $title->getLocalURL( 'wpCaptchaId=' . urlencode( $index ) ),
|
|
'alt' => ''
|
|
]
|
|
) . $captchaReload . Html::closeElement( 'div' ) . Html::closeElement( 'div' ) . "\n" .
|
|
Html::element( 'input', [
|
|
'name' => 'wpCaptchaWord',
|
|
'class' => 'mw-ui-input',
|
|
'id' => 'wpCaptchaWord',
|
|
'type' => 'text',
|
|
'size' => '12', // max_length in captcha.py plus fudge factor
|
|
'autocomplete' => 'off',
|
|
'autocorrect' => 'off',
|
|
'autocapitalize' => 'off',
|
|
'required' => 'required',
|
|
'tabindex' => $tabIndex,
|
|
'placeholder' => wfMessage( 'fancycaptcha-imgcaptcha-ph' )
|
|
]
|
|
); // tab in before the edit textarea
|
|
if ( $this->action == 'createaccount' ) {
|
|
// use raw element, because the message can contain links or some other html
|
|
$form .= Html::rawElement( 'small', [
|
|
'class' => 'mw-createacct-captcha-assisted'
|
|
], wfMessage( 'createacct-imgcaptcha-help' )->parse()
|
|
);
|
|
}
|
|
$form .= Html::element( 'input', [
|
|
'type' => 'hidden',
|
|
'name' => 'wpCaptchaId',
|
|
'id' => 'wpCaptchaId',
|
|
'value' => $index
|
|
]
|
|
) . Html::closeElement( 'div' ) . Html::closeElement( 'div' ) . "\n";
|
|
|
|
return [
|
|
'html' => $form,
|
|
'modules' => $modules,
|
|
// Uses addModuleStyles so it is loaded when JS is disabled.
|
|
'modulestyles' => [ 'ext.confirmEdit.fancyCaptcha.styles' ],
|
|
];
|
|
}
|
|
|
|
/**
|
|
* Select a previously generated captcha image from the queue.
|
|
* @return mixed tuple of (salt key, text hash) or false if no image to find
|
|
*/
|
|
protected function pickImage() {
|
|
global $wgCaptchaDirectoryLevels;
|
|
|
|
$lockouts = 0; // number of times another process claimed a file before this one
|
|
$baseDir = $this->getBackend()->getRootStoragePath() . '/captcha-render';
|
|
return $this->pickImageDir( $baseDir, $wgCaptchaDirectoryLevels, $lockouts );
|
|
}
|
|
|
|
/**
|
|
* @param $directory string
|
|
* @param $levels integer
|
|
* @param $lockouts integer
|
|
* @return array|bool
|
|
*/
|
|
protected function pickImageDir( $directory, $levels, &$lockouts ) {
|
|
global $wgMemc;
|
|
|
|
if ( $levels <= 0 ) { // $directory has regular files
|
|
return $this->pickImageFromDir( $directory, $lockouts );
|
|
}
|
|
|
|
$backend = $this->getBackend();
|
|
|
|
$key = "fancycaptcha:dirlist:{$backend->getWikiId()}:" . sha1( $directory );
|
|
$dirs = $wgMemc->get( $key ); // check cache
|
|
if ( !is_array( $dirs ) || !count( $dirs ) ) { // cache miss
|
|
$dirs = []; // subdirs actually present...
|
|
foreach ( $backend->getTopDirectoryList( [ 'dir' => $directory ] ) as $entry ) {
|
|
if ( ctype_xdigit( $entry ) && strlen( $entry ) == 1 ) {
|
|
$dirs[] = $entry;
|
|
}
|
|
}
|
|
wfDebug( "Cache miss for $directory subdirectory listing.\n" );
|
|
if ( count( $dirs ) ) {
|
|
$wgMemc->set( $key, $dirs, 86400 );
|
|
}
|
|
}
|
|
|
|
if ( !count( $dirs ) ) {
|
|
// Remove this directory if empty so callers don't keep looking here
|
|
$backend->clean( [ 'dir' => $directory ] );
|
|
return false; // none found
|
|
}
|
|
|
|
$place = mt_rand( 0, count( $dirs ) - 1 ); // pick a random subdir
|
|
// In case all dirs are not filled, cycle through next digits...
|
|
$fancyCount = count( $dirs );
|
|
for ( $j = 0; $j < $fancyCount; $j++ ) {
|
|
$char = $dirs[( $place + $j ) % count( $dirs )];
|
|
$info = $this->pickImageDir( "$directory/$char", $levels - 1, $lockouts );
|
|
if ( $info ) {
|
|
return $info; // found a captcha
|
|
} else {
|
|
wfDebug( "Could not find captcha in $directory.\n" );
|
|
$wgMemc->delete( $key ); // files changed on disk?
|
|
}
|
|
}
|
|
|
|
return false; // didn't find any images in this directory... empty?
|
|
}
|
|
|
|
/**
|
|
* @param $directory string
|
|
* @param $lockouts integer
|
|
* @return array|bool
|
|
*/
|
|
protected function pickImageFromDir( $directory, &$lockouts ) {
|
|
global $wgMemc;
|
|
|
|
$backend = $this->getBackend();
|
|
|
|
$key = "fancycaptcha:filelist:{$backend->getWikiId()}:" . sha1( $directory );
|
|
$files = $wgMemc->get( $key ); // check cache
|
|
if ( !is_array( $files ) || !count( $files ) ) { // cache miss
|
|
$files = []; // captcha files
|
|
foreach ( $backend->getTopFileList( [ 'dir' => $directory ] ) as $entry ) {
|
|
$files[] = $entry;
|
|
if ( count( $files ) >= 500 ) { // sanity
|
|
wfDebug( 'Skipping some captchas; $wgCaptchaDirectoryLevels set too low?.' );
|
|
break;
|
|
}
|
|
}
|
|
if ( count( $files ) ) {
|
|
$wgMemc->set( $key, $files, 86400 );
|
|
}
|
|
wfDebug( "Cache miss for $directory captcha listing.\n" );
|
|
}
|
|
|
|
if ( !count( $files ) ) {
|
|
// Remove this directory if empty so callers don't keep looking here
|
|
$backend->clean( [ 'dir' => $directory ] );
|
|
return false;
|
|
}
|
|
|
|
$info = $this->pickImageFromList( $directory, $files, $lockouts );
|
|
if ( !$info ) {
|
|
wfDebug( "Could not find captcha in $directory.\n" );
|
|
$wgMemc->delete( $key ); // files changed on disk?
|
|
}
|
|
|
|
return $info;
|
|
}
|
|
|
|
/**
|
|
* @param $directory string
|
|
* @param $files array
|
|
* @param $lockouts integer
|
|
* @return array|bool
|
|
*/
|
|
protected function pickImageFromList( $directory, array $files, &$lockouts ) {
|
|
global $wgMemc, $wgCaptchaDeleteOnSolve;
|
|
|
|
if ( !count( $files ) ) {
|
|
return false; // none found
|
|
}
|
|
|
|
$backend = $this->getBackend();
|
|
$place = mt_rand( 0, count( $files ) - 1 ); // pick a random file
|
|
$misses = 0; // number of files in listing that don't actually exist
|
|
$fancyImageCount = count( $files );
|
|
for ( $j = 0; $j < $fancyImageCount; $j++ ) {
|
|
$entry = $files[( $place + $j ) % count( $files )];
|
|
if ( preg_match( '/^image_([0-9a-f]+)_([0-9a-f]+)\\.png$/', $entry, $matches ) ) {
|
|
if ( $wgCaptchaDeleteOnSolve ) { // captcha will be deleted when solved
|
|
$key = "fancycaptcha:filelock:{$backend->getWikiId()}:" . sha1( $entry );
|
|
// Try to claim this captcha for 10 minutes (for the user to solve)...
|
|
if ( ++$lockouts <= 10 && !$wgMemc->add( $key, '1', 600 ) ) {
|
|
continue; // could not acquire (skip it to avoid race conditions)
|
|
}
|
|
}
|
|
if ( !$backend->fileExists( [ 'src' => "$directory/$entry" ] ) ) {
|
|
if ( ++$misses >= 5 ) { // too many files in the listing don't exist
|
|
break; // listing cache too stale? break out so it will be cleared
|
|
}
|
|
continue; // try next file
|
|
}
|
|
return [
|
|
'salt' => $matches[1],
|
|
'hash' => $matches[2],
|
|
'viewed' => false,
|
|
];
|
|
}
|
|
}
|
|
|
|
return false; // none found
|
|
}
|
|
|
|
/**
|
|
* @return bool|StatusValue
|
|
*/
|
|
function showImage() {
|
|
global $wgOut, $wgRequest;
|
|
|
|
$wgOut->disable();
|
|
|
|
$index = $wgRequest->getVal( 'wpCaptchaId' );
|
|
$info = $this->retrieveCaptcha( $index );
|
|
if ( $info ) {
|
|
$timestamp = new MWTimestamp();
|
|
$info['viewed'] = $timestamp->getTimestamp();
|
|
$this->storeCaptcha( $info );
|
|
|
|
$salt = $info['salt'];
|
|
$hash = $info['hash'];
|
|
|
|
return $this->getBackend()->streamFile( [
|
|
'src' => $this->imagePath( $salt, $hash ),
|
|
'headers' => [ "Cache-Control: private, s-maxage=0, max-age=3600" ]
|
|
] )->isOK();
|
|
}
|
|
|
|
wfHttpError( 400, 'Request Error', 'Requested bogus captcha image' );
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param $salt string
|
|
* @param $hash string
|
|
* @return string
|
|
*/
|
|
public function imagePath( $salt, $hash ) {
|
|
global $wgCaptchaDirectoryLevels;
|
|
|
|
$file = $this->getBackend()->getRootStoragePath() . '/captcha-render/';
|
|
for ( $i = 0; $i < $wgCaptchaDirectoryLevels; $i++ ) {
|
|
$file .= $hash{ $i } . '/';
|
|
}
|
|
$file .= "image_{$salt}_{$hash}.png";
|
|
|
|
return $file;
|
|
}
|
|
|
|
/**
|
|
* @param $basename string
|
|
* @return array (salt, hash)
|
|
* @throws Exception
|
|
*/
|
|
public function hashFromImageName( $basename ) {
|
|
if ( preg_match( '/^image_([0-9a-f]+)_([0-9a-f]+)\\.png$/', $basename, $matches ) ) {
|
|
return [ $matches[1], $matches[2] ];
|
|
} else {
|
|
throw new Exception( "Invalid filename '$basename'.\n" );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Delete a solved captcha image, if $wgCaptchaDeleteOnSolve is true.
|
|
* @inheritDoc
|
|
*/
|
|
protected function passCaptcha( $index, $word ) {
|
|
global $wgCaptchaDeleteOnSolve;
|
|
|
|
$info = $this->retrieveCaptcha( $index ); // get the captcha info before it gets deleted
|
|
$pass = parent::passCaptcha( $index, $word );
|
|
|
|
if ( $pass && $wgCaptchaDeleteOnSolve ) {
|
|
$this->getBackend()->quickDelete( [
|
|
'src' => $this->imagePath( $info['salt'], $info['hash'] )
|
|
] );
|
|
}
|
|
|
|
return $pass;
|
|
}
|
|
|
|
/**
|
|
* Returns an array with 'salt' and 'hash' keys. Hash is
|
|
* md5( $wgCaptchaSecret . $salt . $answer . $wgCaptchaSecret . $salt )[0..15]
|
|
* @return array
|
|
* @throws Exception When a captcha image cannot be produced.
|
|
*/
|
|
public function getCaptcha() {
|
|
$info = $this->pickImage();
|
|
if ( !$info ) {
|
|
throw new UnderflowException( 'Ran out of captcha images' );
|
|
}
|
|
return $info;
|
|
}
|
|
|
|
/**
|
|
* @param array $captchaData
|
|
* @param string $id
|
|
* @return string
|
|
*/
|
|
public function getCaptchaInfo( $captchaData, $id ) {
|
|
$title = SpecialPage::getTitleFor( 'Captcha', 'image' );
|
|
return $title->getLocalURL( 'wpCaptchaId=' . urlencode( $id ) );
|
|
}
|
|
|
|
/**
|
|
* @param array $requests
|
|
* @param array $fieldInfo
|
|
* @param array $formDescriptor
|
|
* @param string $action
|
|
*/
|
|
public function onAuthChangeFormFields(
|
|
array $requests, array $fieldInfo, array &$formDescriptor, $action
|
|
) {
|
|
/** @var CaptchaAuthenticationRequest $req */
|
|
$req =
|
|
AuthenticationRequest::getRequestByClass( $requests,
|
|
CaptchaAuthenticationRequest::class, true );
|
|
if ( !$req ) {
|
|
return;
|
|
}
|
|
|
|
// HTMLFancyCaptchaField will include this
|
|
unset( $formDescriptor['captchaInfo' ] );
|
|
|
|
$formDescriptor['captchaWord'] = [
|
|
'class' => HTMLFancyCaptchaField::class,
|
|
'imageUrl' => $this->getCaptchaInfo( $req->captchaData, $req->captchaId ),
|
|
'label-message' => $this->getMessage( $this->action ),
|
|
'showCreateHelp' => in_array( $action, [
|
|
AuthManager::ACTION_CREATE,
|
|
AuthManager::ACTION_CREATE_CONTINUE
|
|
], true ),
|
|
] + $formDescriptor['captchaWord'];
|
|
}
|
|
}
|