includes/api/ApiFormatBase.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 19, 2006
   6  *
   7  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * This is the abstract base class for API formatters.
  29  *
  30  * @ingroup API
  31  */
  32 abstract class ApiFormatBase extends ApiBase {
  33         private $mIsHtml, $mFormat, $mUnescapeAmps, $mHelp;
  34         private $mBuffer, $mDisabled = false;
  35         private $mIsWrappedHtml = false;
  36         private $mHttpStatus = false;
  37         protected $mForceDefaultParams = false;
  38
  39         /**
  40          * If $format ends with 'fm', pretty-print the output in HTML.
  41          * @param ApiMain $main
  42          * @param string $format Format name
  43          */
  44         public function __construct( ApiMain $main, $format ) {
  45                 parent::__construct( $main, $format );
  46
  47                 $this->mIsHtml = ( substr( $format, -2, 2 ) === 'fm' ); // ends with 'fm'
  48                 if ( $this->mIsHtml ) {
  49                         $this->mFormat = substr( $format, 0, -2 ); // remove ending 'fm'
  50                         $this->mIsWrappedHtml = $this->getMain()->getCheck( 'wrappedhtml' );
  51                 } else {
  52                         $this->mFormat = $format;
  53                 }
  54                 $this->mFormat = strtoupper( $this->mFormat );
  55         }
  56
  57         /**
  58          * Overriding class returns the MIME type that should be sent to the client.
  59          *
  60          * When getIsHtml() returns true, the return value here is used for syntax
  61          * highlighting but the client sees text/html.
  62          *
  63          * @return string
  64          */
  65         abstract public function getMimeType();
  66
  67         /**
  68          * Get the internal format name
  69          * @return string
  70          */
  71         public function getFormat() {
  72                 return $this->mFormat;
  73         }
  74
  75         /**
  76          * Returns true when the HTML pretty-printer should be used.
  77          * The default implementation assumes that formats ending with 'fm'
  78          * should be formatted in HTML.
  79          * @return bool
  80          */
  81         public function getIsHtml() {
  82                 return $this->mIsHtml;
  83         }
  84
  85         /**
  86          * Returns true when the special wrapped mode is enabled.
  87          * @since 1.27
  88          * @return bool
  89          */
  90         protected function getIsWrappedHtml() {
  91                 return $this->mIsWrappedHtml;
  92         }
  93
  94         /**
  95          * Disable the formatter.
  96          *
  97          * This causes calls to initPrinter() and closePrinter() to be ignored.
  98          */
  99         public function disable() {
 100                 $this->mDisabled = true;
 101         }
 102
 103         /**
 104          * Whether the printer is disabled
 105          * @return bool
 106          */
 107         public function isDisabled() {
 108                 return $this->mDisabled;
 109         }
 110
 111         /**
 112          * Whether this formatter can handle printing API errors.
 113          *
 114          * If this returns false, then on API errors the default printer will be
 115          * instantiated.
 116          * @since 1.23
 117          * @return bool
 118          */
 119         public function canPrintErrors() {
 120                 return true;
 121         }
 122
 123         /**
 124          * Ignore request parameters, force a default.
 125          *
 126          * Used as a fallback if errors are being thrown.
 127          * @since 1.26
 128          */
 129         public function forceDefaultParams() {
 130                 $this->mForceDefaultParams = true;
 131         }
 132
 133         /**
 134          * Overridden to honor $this->forceDefaultParams(), if applicable
 135          * @since 1.26
 136          */
 137         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 138                 if ( !$this->mForceDefaultParams ) {
 139                         return parent::getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 140                 }
 141
 142                 if ( !is_array( $paramSettings ) ) {
 143                         return $paramSettings;
 144                 } elseif ( isset( $paramSettings[self::PARAM_DFLT] ) ) {
 145                         return $paramSettings[self::PARAM_DFLT];
 146                 } else {
 147                         return null;
 148                 }
 149         }
 150
 151         /**
 152          * Set the HTTP status code to be used for the response
 153          * @since 1.29
 154          * @param int $code
 155          */
 156         public function setHttpStatus( $code ) {
 157                 if ( $this->mDisabled ) {
 158                         return;
 159                 }
 160
 161                 if ( $this->getIsHtml() ) {
 162                         $this->mHttpStatus = $code;
 163                 } else {
 164                         $this->getMain()->getRequest()->response()->statusHeader( $code );
 165                 }
 166         }
 167
 168         /**
 169          * Initialize the printer function and prepare the output headers.
 170          * @param bool $unused Always false since 1.25
 171          */
 172         public function initPrinter( $unused = false ) {
 173                 if ( $this->mDisabled ) {
 174                         return;
 175                 }
 176
 177                 $mime = $this->getIsWrappedHtml()
 178                         ? 'text/mediawiki-api-prettyprint-wrapped'
 179                         : ( $this->getIsHtml() ? 'text/html' : $this->getMimeType() );
 180
 181                 // Some printers (ex. Feed) do their own header settings,
 182                 // in which case $mime will be set to null
 183                 if ( $mime === null ) {
 184                         return; // skip any initialization
 185                 }
 186
 187                 $this->getMain()->getRequest()->response()->header( "Content-Type: $mime; charset=utf-8" );
 188
 189                 // Set X-Frame-Options API results (T41180)
 190                 $apiFrameOptions = $this->getConfig()->get( 'ApiFrameOptions' );
 191                 if ( $apiFrameOptions ) {
 192                         $this->getMain()->getRequest()->response()->header( "X-Frame-Options: $apiFrameOptions" );
 193                 }
 194         }
 195
 196         /**
 197          * Finish printing and output buffered data.
 198          */
 199         public function closePrinter() {
 200                 if ( $this->mDisabled ) {
 201                         return;
 202                 }
 203
 204                 $mime = $this->getMimeType();
 205                 if ( $this->getIsHtml() && $mime !== null ) {
 206                         $format = $this->getFormat();
 207                         $lcformat = strtolower( $format );
 208                         $result = $this->getBuffer();
 209
 210                         $context = new DerivativeContext( $this->getMain() );
 211                         $context->setSkin( SkinFactory::getDefaultInstance()->makeSkin( 'apioutput' ) );
 212                         $context->setTitle( SpecialPage::getTitleFor( 'ApiHelp' ) );
 213                         $out = new OutputPage( $context );
 214                         $context->setOutput( $out );
 215
 216                         $out->addModuleStyles( 'mediawiki.apipretty' );
 217                         $out->setPageTitle( $context->msg( 'api-format-title' ) );
 218
 219                         if ( !$this->getIsWrappedHtml() ) {
 220                                 // When the format without suffix 'fm' is defined, there is a non-html version
 221                                 if ( $this->getMain()->getModuleManager()->isDefined( $lcformat, 'format' ) ) {
 222                                         if ( !$this->getRequest()->wasPosted() ) {
 223                                                 $nonHtmlUrl = strtok( $this->getRequest()->getFullRequestURL(), '?' )
 224                                                         . '?' . $this->getRequest()->appendQueryValue( 'format', $lcformat );
 225                                                 $msg = $context->msg( 'api-format-prettyprint-header-hyperlinked' )
 226                                                         ->params( $format, $lcformat, $nonHtmlUrl );
 227                                         } else {
 228                                                 $msg = $context->msg( 'api-format-prettyprint-header' )->params( $format, $lcformat );
 229                                         }
 230                                 } else {
 231                                         $msg = $context->msg( 'api-format-prettyprint-header-only-html' )->params( $format );
 232                                 }
 233
 234                                 $header = $msg->parseAsBlock();
 235                                 $out->addHTML(
 236                                         Html::rawElement( 'div', [ 'class' => 'api-pretty-header' ],
 237                                                 ApiHelp::fixHelpLinks( $header )
 238                                         )
 239                                 );
 240
 241                                 if ( $this->mHttpStatus && $this->mHttpStatus !== 200 ) {
 242                                         $out->addHTML(
 243                                                 Html::rawElement( 'div', [ 'class' => 'api-pretty-header api-pretty-status' ],
 244                                                         $this->msg(
 245                                                                 'api-format-prettyprint-status',
 246                                                                 $this->mHttpStatus,
 247                                                                 HttpStatus::getMessage( $this->mHttpStatus )
 248                                                         )->parse()
 249                                                 )
 250                                         );
 251                                 }
 252                         }
 253
 254                         if ( Hooks::run( 'ApiFormatHighlight', [ $context, $result, $mime, $format ] ) ) {
 255                                 $out->addHTML(
 256                                         Html::element( 'pre', [ 'class' => 'api-pretty-content' ], $result )
 257                                 );
 258                         }
 259
 260                         if ( $this->getIsWrappedHtml() ) {
 261                                 // This is a special output mode mainly intended for ApiSandbox use
 262                                 $time = microtime( true ) - $this->getConfig()->get( 'RequestTime' );
 263                                 $json = FormatJson::encode(
 264                                         [
 265                                                 'status' => (int)( $this->mHttpStatus ?: 200 ),
 266                                                 'statustext' => HttpStatus::getMessage( $this->mHttpStatus ?: 200 ),
 267                                                 'html' => $out->getHTML(),
 268                                                 'modules' => array_values( array_unique( array_merge(
 269                                                         $out->getModules(),
 270                                                         $out->getModuleScripts(),
 271                                                         $out->getModuleStyles()
 272                                                 ) ) ),
 273                                                 'continue' => $this->getResult()->getResultData( 'continue' ),
 274                                                 'time' => round( $time * 1000 ),
 275                                         ],
 276                                         false, FormatJson::ALL_OK
 277                                 );
 278
 279                                 // T68776: wfMangleFlashPolicy() is needed to avoid a nasty bug in
 280                                 // Flash, but what it does isn't friendly for the API, so we need to
 281                                 // work around it.
 282                                 if ( preg_match( '/\<\s*cross-domain-policy\s*\>/i', $json ) ) {
 283                                         $json = preg_replace(
 284                                                 '/\<(\s*cross-domain-policy\s*)\>/i', '\\u003C$1\\u003E', $json
 285                                         );
 286                                 }
 287
 288                                 echo $json;
 289                         } else {
 290                                 // API handles its own clickjacking protection.
 291                                 // Note, that $wgBreakFrames will still override $wgApiFrameOptions for format mode.
 292                                 $out->allowClickjacking();
 293                                 $out->output();
 294                         }
 295                 } else {
 296                         // For non-HTML output, clear all errors that might have been
 297                         // displayed if display_errors=On
 298                         ob_clean();
 299
 300                         echo $this->getBuffer();
 301                 }
 302         }
 303
 304         /**
 305          * Append text to the output buffer.
 306          * @param string $text
 307          */
 308         public function printText( $text ) {
 309                 $this->mBuffer .= $text;
 310         }
 311
 312         /**
 313          * Get the contents of the buffer.
 314          * @return string
 315          */
 316         public function getBuffer() {
 317                 return $this->mBuffer;
 318         }
 319
 320         public function getAllowedParams() {
 321                 $ret = [];
 322                 if ( $this->getIsHtml() ) {
 323                         $ret['wrappedhtml'] = [
 324                                 ApiBase::PARAM_DFLT => false,
 325                                 ApiBase::PARAM_HELP_MSG => 'apihelp-format-param-wrappedhtml',
 326
 327                         ];
 328                 }
 329                 return $ret;
 330         }
 331
 332         protected function getExamplesMessages() {
 333                 return [
 334                         'action=query&meta=siteinfo&siprop=namespaces&format=' . $this->getModuleName()
 335                                 => [ 'apihelp-format-example-generic', $this->getFormat() ]
 336                 ];
 337         }
 338
 339         public function getHelpUrls() {
 340                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Data_formats';
 341         }
 342
 343 }
 344
 345 /**
 346  * For really cool vim folding this needs to be at the end:
 347  * vim: foldmarker=@{,@} foldmethod=marker
 348  */