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<?php
/**
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\Preferences;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\Html\Html;
use MediaWiki\MainConfigNames;
use MediaWiki\Parser\ParserFactory;
use MediaWiki\Parser\ParserOptions;
use MediaWiki\Parser\ParserOutputFlags;
use MediaWiki\Parser\ParserOutputLinkTypes;
use MediaWiki\Parser\Parsoid\LintErrorChecker;
use MediaWiki\SpecialPage\SpecialPage;
use MediaWiki\SpecialPage\SpecialPageFactory;
use MediaWiki\Title\TitleFactory;
use MediaWiki\User\User;
use MediaWiki\User\UserIdentity;
use MessageLocalizer;
use OOUI\ButtonWidget;
/**
* @since 1.35
*/
class SignatureValidator {
/** @var array Made public for use in services */
public const CONSTRUCTOR_OPTIONS = [
MainConfigNames::SignatureAllowedLintErrors,
MainConfigNames::VirtualRestConfig,
];
/** @var UserIdentity */
private $user;
/** @var MessageLocalizer|null */
private $localizer;
/** @var ParserOptions */
private $popts;
/** @var ParserFactory */
private $parserFactory;
private LintErrorChecker $lintErrorChecker;
/** @var ServiceOptions */
private $serviceOptions;
/** @var SpecialPageFactory */
private $specialPageFactory;
/** @var TitleFactory */
private $titleFactory;
/**
* @param ServiceOptions $options
* @param UserIdentity $user
* @param ?MessageLocalizer $localizer
* @param ParserOptions $popts
* @param ParserFactory $parserFactory
* @param LintErrorChecker $lintErrorChecker
* @param SpecialPageFactory $specialPageFactory
* @param TitleFactory $titleFactory
*/
public function __construct(
ServiceOptions $options,
UserIdentity $user,
?MessageLocalizer $localizer,
ParserOptions $popts,
ParserFactory $parserFactory,
LintErrorChecker $lintErrorChecker,
SpecialPageFactory $specialPageFactory,
TitleFactory $titleFactory
) {
$this->user = $user;
$this->localizer = $localizer;
$this->popts = $popts;
$this->parserFactory = $parserFactory;
$this->lintErrorChecker = $lintErrorChecker;
// Configuration
$this->serviceOptions = $options;
$this->serviceOptions->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
// TODO SpecialPage::getTitleFor should also be available via SpecialPageFactory
$this->specialPageFactory = $specialPageFactory;
$this->titleFactory = $titleFactory;
}
/**
* @param string $signature Signature before PST
* @return string[]|bool If localizer is defined: List of errors, as HTML (empty array for no errors)
* If localizer is not defined: True if there are errors, false if there are no errors
*/
public function validateSignature( string $signature ) {
$pstSignature = $this->applyPreSaveTransform( $signature );
if ( $pstSignature === false ) {
// Return early because the rest of the validation uses wikitext parsing, which requires
// the pre-save transform to be applied first, and we just found out that the result of the
// pre-save transform would require *another* pre-save transform, which is crazy
if ( $this->localizer ) {
return [ $this->localizer->msg( 'badsigsubst' )->parse() ];
}
return true;
}
$pstWasApplied = false;
if ( $pstSignature !== $signature ) {
$pstWasApplied = true;
$signature = $pstSignature;
}
$errors = $this->localizer ? [] : false;
$lintErrors = $this->checkLintErrors( $signature );
if ( $lintErrors ) {
$messages = '';
foreach ( $lintErrors as $error ) {
if ( !$this->localizer ) {
$errors = true;
break;
}
$details = $this->getLintErrorDetails( $error );
$location = $this->getLintErrorLocation( $error );
// THESE MESSAGE IDS SHOULD BE KEPT IN SYNC WITH
// those declared in Extension:Linter -- in particular
// there should be a linterror-<cat> declared here for every
// linter-pager-<cat>-details declared in Linter's qqq.json.
// T360809: this redundancy should be eventually eliminated
// Messages used here:
// * linterror-bogus-image-options
// * linterror-deletable-table-tag
// * linterror-duplicate-ids
// * linterror-empty-heading
// * linterror-fostered
// * linterror-fostered-transparent
// * linterror-html5-misnesting
// * linterror-inline-media-caption
// * linterror-large-tables
// * linterror-misc-tidy-replacement-issues
// * linterror-misnested-tag
// * linterror-missing-end-tag
// * linterror-missing-end-tag-in-heading
// * linterror-missing-image-alt-text
// * linterror-multi-colon-escape
// * linterror-multiline-html-table-in-list
// * linterror-multiple-unclosed-formatting-tags
// * linterror-night-mode-unaware-background-color
// * linterror-obsolete-tag
// * linterror-pwrap-bug-workaround
// * linterror-self-closed-tag
// * linterror-stripped-tag
// * linterror-tidy-font-bug
// * linterror-tidy-whitespace-bug
// * linterror-unclosed-quotes-in-heading
// * linterror-wikilink-in-extlink
$label = $this->localizer->msg( "linterror-{$error['type']}" )->parse();
$docsLink = new ButtonWidget( [
'href' =>
"https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Lint_errors/{$error['type']}",
'target' => '_blank',
'label' => $this->localizer->msg( 'prefs-signature-error-details' )->text(),
] );
// If pre-save transform was applied (i.e., the signature has 'subst:' syntax),
// error locations will be incorrect, because Parsoid can't expand templates.
// Don't display them.
$encLocation = $pstWasApplied ? null : json_encode( $location );
$messages .= Html::rawElement(
'li',
[ 'data-mw-lint-error-location' => $encLocation ],
$label . $this->localizer->msg( 'colon-separator' )->escaped() .
$details . ' ' . $docsLink
);
}
if ( $messages && $this->localizer ) {
$errors[] = $this->localizer->msg( 'badsightml' )->parse() .
Html::rawElement( 'ol', [], $messages );
}
}
if ( !$this->checkUserLinks( $signature ) ) {
if ( $this->localizer ) {
$userText = wfEscapeWikiText( $this->user->getName() );
$linkWikitext = $this->localizer->msg( 'signature', $userText, $userText )->inContentLanguage()->text();
$errors[] = $this->localizer->msg( 'badsiglinks', wfEscapeWikiText( $linkWikitext ) )->parse();
} else {
$errors = true;
}
}
if ( !$this->checkLineBreaks( $signature ) ) {
if ( $this->localizer ) {
$errors[] = $this->localizer->msg( 'badsiglinebreak' )->parse();
} else {
$errors = true;
}
}
return $errors;
}
/**
* @param string $signature Signature before PST
* @return string|false Signature with PST applied, or false if applying PST yields wikitext that
* would change if PST was applied again
*/
protected function applyPreSaveTransform( string $signature ) {
// This may be called by the Parser when it's displaying a signature, so we need a new instance
$parser = $this->parserFactory->getInstance();
$pstSignature = $parser->preSaveTransform(
$signature,
SpecialPage::getTitleFor( 'Preferences' ),
$this->user,
$this->popts
);
// The signature wikitext contains another '~~~~' or similar (T230652)
if ( $parser->getOutput()->getOutputFlag( ParserOutputFlags::USER_SIGNATURE ) ) {
return false;
}
// The signature wikitext contains '{{subst:...}}' markup that produces another subst (T230652)
$pstPstSignature = $parser->preSaveTransform(
$pstSignature,
SpecialPage::getTitleFor( 'Preferences' ),
$this->user,
$this->popts
);
if ( $pstPstSignature !== $pstSignature ) {
return false;
}
return $pstSignature;
}
/**
* @param string $signature Signature after PST
* @return array Array of error objects returned by Parsoid's lint API (empty array for no errors)
*/
protected function checkLintErrors( string $signature ): array {
// Real check for mismatched HTML tags in the *output*.
// This has to use Parsoid because PHP Parser doesn't produce this information,
// it just fixes up the result quietly.
$disabled = array_merge(
[
// Always appears with 'missing-end-tag', we can ignore it to
// simplify the error message
'multiple-unclosed-formatting-tags',
],
$this->serviceOptions->get(
MainConfigNames::SignatureAllowedLintErrors
)
);
return $this->lintErrorChecker->checkSome( $signature, $disabled );
}
/**
* @param string $signature Signature after PST
* @return bool Whether signature contains required links
*/
protected function checkUserLinks( string $signature ): bool {
// This may be called by the Parser when it's displaying a signature, so we need a new instance
$parser = $this->parserFactory->getInstance();
// Check for required links. This one's easier to do with the PHP Parser.
$pout = $parser->parse(
$signature,
SpecialPage::getTitleFor( 'Preferences' ),
$this->popts
);
// Checking user or talk links is easy
$user = User::newFromIdentity( $this->user );
$userPage = $user->getUserPage();
$userTalkPage = $user->getTalkPage();
foreach (
$pout->getLinkList( ParserOutputLinkTypes::LOCAL )
as [ 'link' => $link ]
) {
if (
$link->isSameLinkAs( $userPage ) ||
$link->isSameLinkAs( $userTalkPage )
) {
return true;
}
}
// Checking the contributions link is harder, because the special page name and the username in
// the "subpage parameter" are not normalized for us.
foreach (
$pout->getLinkList( ParserOutputLinkTypes::SPECIAL )
as [ 'link' => $link ]
) {
[ $name, $subpage ] = $this->specialPageFactory->resolveAlias( $link->getDBkey() );
if ( $name === 'Contributions' && $subpage ) {
$userTitle = $this->titleFactory->makeTitleSafe( NS_USER, $subpage );
if ( $userTitle && $userTitle->isSameLinkAs( $userPage ) ) {
return true;
}
}
}
return false;
}
/**
* @param string $signature Signature after PST
* @return bool Whether signature contains no line breaks
*/
protected function checkLineBreaks( string $signature ): bool {
return !preg_match( "/[\r\n]/", $signature );
}
// Adapted from the Linter extension
private function getLintErrorLocation( array $lintError ): array {
return array_slice( $lintError['dsr'], 0, 2 );
}
// Adapted from the Linter extension
private function getLintErrorDetails( array $lintError ): string {
[ 'type' => $type, 'params' => $params ] = $lintError;
if ( $type === 'bogus-image-options' && isset( $params['items'] ) ) {
$list = array_map( static function ( $in ) {
return Html::element( 'code', [], $in );
}, $params['items'] );
return implode(
$this->localizer->msg( 'comma-separator' )->escaped(),
$list
);
} elseif ( $type === 'pwrap-bug-workaround' &&
isset( $params['root'] ) &&
isset( $params['child'] ) ) {
return Html::element( 'code', [],
$params['root'] . " > " . $params['child'] );
} elseif ( $type === 'tidy-whitespace-bug' &&
isset( $params['node'] ) &&
isset( $params['sibling'] ) ) {
return Html::element( 'code', [],
$params['node'] . " + " . $params['sibling'] );
} elseif ( $type === 'multi-colon-escape' &&
isset( $params['href'] ) ) {
return Html::element( 'code', [], $params['href'] );
} elseif ( $type === 'multiline-html-table-in-list' ) {
/* ancestor and name will be set */
return Html::element( 'code', [],
$params['ancestorName'] . " > " . $params['name'] );
} elseif ( $type === 'misc-tidy-replacement-issues' ) {
/* There will be a 'subtype' param to disambiguate */
return Html::element( 'code', [], $params['subtype'] );
} elseif ( $type === 'missing-end-tag' ) {
return Html::element( 'code', [], '</' . $params['name'] . '>' );
} elseif ( isset( $params['name'] ) ) {
return Html::element( 'code', [], $params['name'] );
}
return '';
}
}