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<?php
/**
* Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
*
* 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\Api;
use MediaWiki\Context\DerivativeContext;
use MediaWiki\Html\Html;
use MediaWiki\Json\FormatJson;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Output\OutputPage;
use MediaWiki\SpecialPage\SpecialPage;
use Wikimedia\Http\HttpStatus;
use Wikimedia\ParamValidator\ParamValidator;
/**
* This is the abstract base class for API formatters.
*
* @ingroup API
*/
abstract class ApiFormatBase extends ApiBase {
private bool $mIsHtml;
private string $mFormat;
private string $mBuffer = '';
private bool $mDisabled = false;
/** @var bool */
private $mIsWrappedHtml = false;
/** @var int|false */
private $mHttpStatus = false;
/** @var bool */
protected $mForceDefaultParams = false;
/**
* If $format ends with 'fm', pretty-print the output in HTML.
*
* @param ApiMain $main
* @param string $format Format name
*/
public function __construct( ApiMain $main, string $format ) {
parent::__construct( $main, $format );
$this->mIsHtml = str_ends_with( $format, 'fm' );
if ( $this->mIsHtml ) {
$this->mFormat = substr( $format, 0, -2 ); // remove ending 'fm'
$this->mIsWrappedHtml = $this->getMain()->getCheck( 'wrappedhtml' );
} else {
$this->mFormat = $format;
}
$this->mFormat = strtoupper( $this->mFormat );
}
/**
* Overriding class returns the MIME type that should be sent to the client.
*
* When getIsHtml() returns true, the return value here is used for syntax
* highlighting, but the client sees text/html.
*
* @return string|null
*/
abstract public function getMimeType();
/**
* Return a filename for this module's output.
*
* @note If $this->getIsWrappedHtml() || $this->getIsHtml(), you'll very
* likely want to fall back to this class's version.
* @since 1.27
* @return string Generally, this should be "api-result.$ext"
*/
public function getFilename() {
if ( $this->getIsWrappedHtml() ) {
return 'api-result-wrapped.json';
}
if ( $this->getIsHtml() ) {
return 'api-result.html';
}
$mimeAnalyzer = MediaWikiServices::getInstance()->getMimeAnalyzer();
$ext = $mimeAnalyzer->getExtensionFromMimeTypeOrNull( $this->getMimeType() )
?? strtolower( $this->mFormat );
return "api-result.$ext";
}
/**
* Get the internal format name
*
* @return string
*/
public function getFormat() {
return $this->mFormat;
}
/**
* Returns true when the HTML pretty-printer should be used.
* The default implementation assumes that formats ending with 'fm' should be formatted in HTML.
*
* @return bool
*/
public function getIsHtml() {
return $this->mIsHtml;
}
/**
* Returns true when the special-wrapped mode is enabled.
*
* @since 1.27
* @return bool
*/
protected function getIsWrappedHtml() {
return $this->mIsWrappedHtml;
}
/**
* Disable the formatter.
*
* This causes calls to initPrinter() and closePrinter() to be ignored.
*/
public function disable() {
$this->mDisabled = true;
}
/**
* Whether the printer is disabled.
*
* @return bool
*/
public function isDisabled() {
return $this->mDisabled;
}
/**
* Whether this formatter can handle printing API errors.
*
* If this returns false, then when API errors occur, the default printer will be instantiated.
* @since 1.23
* @return bool
*/
public function canPrintErrors() {
return true;
}
/**
* Ignore request parameters, force a default.
*
* Used as a fallback if errors are being thrown.
*
* @since 1.26
*/
public function forceDefaultParams() {
$this->mForceDefaultParams = true;
}
/**
* Overridden to honor $this->forceDefaultParams(), if applicable
* @inheritDoc
* @since 1.26
*/
protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
if ( !$this->mForceDefaultParams ) {
return parent::getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
}
if ( !is_array( $paramSettings ) ) {
return $paramSettings;
}
return $paramSettings[ParamValidator::PARAM_DEFAULT] ?? null;
}
/**
* Set the HTTP status code to be used for the response
* @since 1.29
* @param int $code
*/
public function setHttpStatus( $code ) {
if ( $this->mDisabled ) {
return;
}
if ( $this->getIsHtml() ) {
$this->mHttpStatus = $code;
} else {
$this->getMain()->getRequest()->response()->statusHeader( $code );
}
}
/**
* Initialize the printer function and prepare the output headers.
* @param bool $unused Always false since 1.25
*/
public function initPrinter( $unused = false ) {
if ( $this->mDisabled ) {
return;
}
if ( $this->getIsHtml() && $this->getMain()->getCacheMode() === 'public' ) {
// The HTML may contain user secrets! T354045
$this->getMain()->setCacheMode( 'anon-public-user-private' );
}
$mime = $this->getIsWrappedHtml()
? 'text/mediawiki-api-prettyprint-wrapped'
: ( $this->getIsHtml() ? 'text/html' : $this->getMimeType() );
// Some printers (ex. Feed) do their own header settings,
// in which case $mime will be set to null
if ( $mime === null ) {
return; // skip any initialization
}
$this->getMain()->getRequest()->response()->header( "Content-Type: $mime; charset=utf-8" );
// Set X-Frame-Options API results (T41180)
$apiFrameOptions = $this->getConfig()->get( MainConfigNames::ApiFrameOptions );
if ( $apiFrameOptions ) {
$this->getMain()->getRequest()->response()->header( "X-Frame-Options: $apiFrameOptions" );
}
// Set a Content-Disposition header so something downloading an API
// response uses a halfway-sensible filename (T128209).
$header = 'Content-Disposition: inline';
$filename = $this->getFilename();
$compatFilename = mb_convert_encoding( $filename, 'ISO-8859-1' );
if ( preg_match( '/^[0-9a-zA-Z!#$%&\'*+\-.^_`|~]+$/', $compatFilename ) ) {
$header .= '; filename=' . $compatFilename;
} else {
$header .= '; filename="'
. preg_replace( '/([\0-\x1f"\x5c\x7f])/', '\\\\$1', $compatFilename ) . '"';
}
if ( $compatFilename !== $filename ) {
$value = "UTF-8''" . rawurlencode( $filename );
// rawurlencode() encodes more characters than RFC 5987 specifies. Unescape the ones it allows.
$value = strtr( $value, [
'%21' => '!', '%23' => '#', '%24' => '$', '%26' => '&', '%2B' => '+', '%5E' => '^',
'%60' => '`', '%7C' => '|',
] );
$header .= '; filename*=' . $value;
}
$this->getMain()->getRequest()->response()->header( $header );
}
/**
* Finish printing and output buffered data.
*/
public function closePrinter() {
if ( $this->mDisabled ) {
return;
}
$mime = $this->getMimeType();
if ( $this->getIsHtml() && $mime !== null ) {
$format = $this->getFormat();
$lcformat = strtolower( $format );
$result = $this->getBuffer();
$context = new DerivativeContext( $this->getMain() );
$skinFactory = MediaWikiServices::getInstance()->getSkinFactory();
$context->setSkin( $skinFactory->makeSkin( 'apioutput' ) );
$context->setTitle( SpecialPage::getTitleFor( 'ApiHelp' ) );
$out = new OutputPage( $context );
$context->setOutput( $out );
$out->setRobotPolicy( 'noindex,nofollow' );
$out->addModuleStyles( 'mediawiki.apipretty' );
$out->setPageTitleMsg( $context->msg( 'api-format-title' ) );
if ( !$this->getIsWrappedHtml() ) {
// When the format without suffix 'fm' is defined, there is a non-html version
if ( $this->getMain()->getModuleManager()->isDefined( $lcformat, 'format' ) ) {
if ( !$this->getRequest()->wasPosted() ) {
$nonHtmlUrl = strtok( $this->getRequest()->getFullRequestURL(), '?' )
. '?' . $this->getRequest()->appendQueryValue( 'format', $lcformat );
$msg = $context->msg( 'api-format-prettyprint-header-hyperlinked' )
->params( $format, $lcformat, $nonHtmlUrl );
} else {
$msg = $context->msg( 'api-format-prettyprint-header' )->params( $format, $lcformat );
}
} else {
$msg = $context->msg( 'api-format-prettyprint-header-only-html' )->params( $format );
}
$header = $msg->parseAsBlock();
$out->addHTML(
Html::rawElement( 'div', [ 'class' => 'api-pretty-header' ],
ApiHelp::fixHelpLinks( $header )
)
);
if ( $this->mHttpStatus && $this->mHttpStatus !== 200 ) {
$out->addHTML(
Html::rawElement( 'div', [ 'class' => [ 'api-pretty-header', 'api-pretty-status' ] ],
$this->msg(
'api-format-prettyprint-status',
$this->mHttpStatus,
HttpStatus::getMessage( $this->mHttpStatus )
)->parse()
)
);
}
}
if ( $this->getHookRunner()->onApiFormatHighlight( $context, $result, $mime, $format ) ) {
$out->addHTML(
Html::element( 'pre', [ 'class' => 'api-pretty-content' ], $result )
);
}
if ( $this->getIsWrappedHtml() ) {
// This is a special output mode mainly intended for ApiSandbox use
$time = $this->getMain()->getRequest()->getElapsedTime();
echo FormatJson::encode(
[
'status' => (int)( $this->mHttpStatus ?: 200 ),
'statustext' => HttpStatus::getMessage( $this->mHttpStatus ?: 200 ),
'html' => $out->getHTML(),
'modules' => array_values( array_unique( array_merge(
$out->getModules(),
$out->getModuleStyles()
) ) ),
'continue' => $this->getResult()->getResultData( 'continue' ),
'time' => round( $time * 1000 ),
],
false, FormatJson::ALL_OK
);
} else {
// API handles its own clickjacking protection.
// Note: $wgBreakFrames will still override $wgApiFrameOptions for format mode.
$out->getMetadata()->setPreventClickjacking( false );
$out->output();
}
} else {
// For non-HTML output, clear all errors that might have been
// displayed if display_errors=On
ob_clean();
echo $this->getBuffer();
}
}
/**
* Append text to the output buffer.
*
* @param string $text
*/
public function printText( $text ) {
$this->mBuffer .= $text;
}
/**
* Get the contents of the buffer.
*
* @return string
*/
public function getBuffer() {
return $this->mBuffer;
}
public function getAllowedParams() {
$ret = [];
if ( $this->getIsHtml() ) {
$ret['wrappedhtml'] = [
ParamValidator::PARAM_DEFAULT => false,
ApiBase::PARAM_HELP_MSG => 'apihelp-format-param-wrappedhtml',
];
}
return $ret;
}
protected function getExamplesMessages() {
return [
'action=query&meta=siteinfo&siprop=namespaces&format=' . $this->getModuleName()
=> [ 'apihelp-format-example-generic', $this->getFormat() ]
];
}
public function getHelpUrls() {
return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Data_formats';
}
}
/**
* For really cool vim folding this needs to be at the end:
* vim: foldmarker=@{,@} foldmethod=marker
*/
/** @deprecated class alias since 1.43 */
class_alias( ApiFormatBase::class, 'ApiFormatBase' );