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          * Return a filename for this module's output.
  69          * @note If $this->getIsWrappedHtml() || $this->getIsHtml(), you'll very
  70          *  likely want to fall back to this class's version.
  71          * @since 1.27
  72          * @return string Generally this should be "api-result.$ext", and must be
  73          *  encoded for inclusion in a Content-Disposition header's filename parameter.
  74          */
  75         public function getFilename() {
  76                 if ( $this->getIsWrappedHtml() ) {
  77                         return 'api-result-wrapped.json';
  78                 } elseif ( $this->getIsHtml() ) {
  79                         return 'api-result.html';
  80                 } else {
  81                         $exts = MimeMagic::singleton()->getExtensionsForType( $this->getMimeType() );
  82                         $ext = $exts ? strtok( $exts, ' ' ) : strtolower( $this->mFormat );
  83                         return "api-result.$ext";
  84                 }
  85         }
  86
  87         /**
  88          * Get the internal format name
  89          * @return string
  90          */
  91         public function getFormat() {
  92                 return $this->mFormat;
  93         }
  94
  95         /**
  96          * Returns true when the HTML pretty-printer should be used.
  97          * The default implementation assumes that formats ending with 'fm'
  98          * should be formatted in HTML.
  99          * @return bool
 100          */
 101         public function getIsHtml() {
 102                 return $this->mIsHtml;
 103         }
 104
 105         /**
 106          * Returns true when the special wrapped mode is enabled.
 107          * @since 1.27
 108          * @return bool
 109          */
 110         protected function getIsWrappedHtml() {
 111                 return $this->mIsWrappedHtml;
 112         }
 113
 114         /**
 115          * Disable the formatter.
 116          *
 117          * This causes calls to initPrinter() and closePrinter() to be ignored.
 118          */
 119         public function disable() {
 120                 $this->mDisabled = true;
 121         }
 122
 123         /**
 124          * Whether the printer is disabled
 125          * @return bool
 126          */
 127         public function isDisabled() {
 128                 return $this->mDisabled;
 129         }
 130
 131         /**
 132          * Whether this formatter can handle printing API errors.
 133          *
 134          * If this returns false, then on API errors the default printer will be
 135          * instantiated.
 136          * @since 1.23
 137          * @return bool
 138          */
 139         public function canPrintErrors() {
 140                 return true;
 141         }
 142
 143         /**
 144          * Ignore request parameters, force a default.
 145          *
 146          * Used as a fallback if errors are being thrown.
 147          * @since 1.26
 148          */
 149         public function forceDefaultParams() {
 150                 $this->mForceDefaultParams = true;
 151         }
 152
 153         /**
 154          * Overridden to honor $this->forceDefaultParams(), if applicable
 155          * @inheritDoc
 156          * @since 1.26
 157          */
 158         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 159                 if ( !$this->mForceDefaultParams ) {
 160                         return parent::getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 161                 }
 162
 163                 if ( !is_array( $paramSettings ) ) {
 164                         return $paramSettings;
 165                 } elseif ( isset( $paramSettings[self::PARAM_DFLT] ) ) {
 166                         return $paramSettings[self::PARAM_DFLT];
 167                 } else {
 168                         return null;
 169                 }
 170         }
 171
 172         /**
 173          * Set the HTTP status code to be used for the response
 174          * @since 1.29
 175          * @param int $code
 176          */
 177         public function setHttpStatus( $code ) {
 178                 if ( $this->mDisabled ) {
 179                         return;
 180                 }
 181
 182                 if ( $this->getIsHtml() ) {
 183                         $this->mHttpStatus = $code;
 184                 } else {
 185                         $this->getMain()->getRequest()->response()->statusHeader( $code );
 186                 }
 187         }
 188
 189         /**
 190          * Initialize the printer function and prepare the output headers.
 191          * @param bool $unused Always false since 1.25
 192          */
 193         public function initPrinter( $unused = false ) {
 194                 if ( $this->mDisabled ) {
 195                         return;
 196                 }
 197
 198                 $mime = $this->getIsWrappedHtml()
 199                         ? 'text/mediawiki-api-prettyprint-wrapped'
 200                         : ( $this->getIsHtml() ? 'text/html' : $this->getMimeType() );
 201
 202                 // Some printers (ex. Feed) do their own header settings,
 203                 // in which case $mime will be set to null
 204                 if ( $mime === null ) {
 205                         return; // skip any initialization
 206                 }
 207
 208                 $this->getMain()->getRequest()->response()->header( "Content-Type: $mime; charset=utf-8" );
 209
 210                 // Set X-Frame-Options API results (T41180)
 211                 $apiFrameOptions = $this->getConfig()->get( 'ApiFrameOptions' );
 212                 if ( $apiFrameOptions ) {
 213                         $this->getMain()->getRequest()->response()->header( "X-Frame-Options: $apiFrameOptions" );
 214                 }
 215
 216                 // Set a Content-Disposition header so something downloading an API
 217                 // response uses a halfway-sensible filename (T128209).
 218                 $filename = $this->getFilename();
 219                 $this->getMain()->getRequest()->response()->header(
 220                         "Content-Disposition: inline; filename=\"{$filename}\""
 221                 );
 222         }
 223
 224         /**
 225          * Finish printing and output buffered data.
 226          */
 227         public function closePrinter() {
 228                 if ( $this->mDisabled ) {
 229                         return;
 230                 }
 231
 232                 $mime = $this->getMimeType();
 233                 if ( $this->getIsHtml() && $mime !== null ) {
 234                         $format = $this->getFormat();
 235                         $lcformat = strtolower( $format );
 236                         $result = $this->getBuffer();
 237
 238                         $context = new DerivativeContext( $this->getMain() );
 239                         $context->setSkin( SkinFactory::getDefaultInstance()->makeSkin( 'apioutput' ) );
 240                         $context->setTitle( SpecialPage::getTitleFor( 'ApiHelp' ) );
 241                         $out = new OutputPage( $context );
 242                         $context->setOutput( $out );
 243
 244                         $out->addModuleStyles( 'mediawiki.apipretty' );
 245                         $out->setPageTitle( $context->msg( 'api-format-title' ) );
 246
 247                         if ( !$this->getIsWrappedHtml() ) {
 248                                 // When the format without suffix 'fm' is defined, there is a non-html version
 249                                 if ( $this->getMain()->getModuleManager()->isDefined( $lcformat, 'format' ) ) {
 250                                         if ( !$this->getRequest()->wasPosted() ) {
 251                                                 $nonHtmlUrl = strtok( $this->getRequest()->getFullRequestURL(), '?' )
 252                                                         . '?' . $this->getRequest()->appendQueryValue( 'format', $lcformat );
 253                                                 $msg = $context->msg( 'api-format-prettyprint-header-hyperlinked' )
 254                                                         ->params( $format, $lcformat, $nonHtmlUrl );
 255                                         } else {
 256                                                 $msg = $context->msg( 'api-format-prettyprint-header' )->params( $format, $lcformat );
 257                                         }
 258                                 } else {
 259                                         $msg = $context->msg( 'api-format-prettyprint-header-only-html' )->params( $format );
 260                                 }
 261
 262                                 $header = $msg->parseAsBlock();
 263                                 $out->addHTML(
 264                                         Html::rawElement( 'div', [ 'class' => 'api-pretty-header' ],
 265                                                 ApiHelp::fixHelpLinks( $header )
 266                                         )
 267                                 );
 268
 269                                 if ( $this->mHttpStatus && $this->mHttpStatus !== 200 ) {
 270                                         $out->addHTML(
 271                                                 Html::rawElement( 'div', [ 'class' => 'api-pretty-header api-pretty-status' ],
 272                                                         $this->msg(
 273                                                                 'api-format-prettyprint-status',
 274                                                                 $this->mHttpStatus,
 275                                                                 HttpStatus::getMessage( $this->mHttpStatus )
 276                                                         )->parse()
 277                                                 )
 278                                         );
 279                                 }
 280                         }
 281
 282                         if ( Hooks::run( 'ApiFormatHighlight', [ $context, $result, $mime, $format ] ) ) {
 283                                 $out->addHTML(
 284                                         Html::element( 'pre', [ 'class' => 'api-pretty-content' ], $result )
 285                                 );
 286                         }
 287
 288                         if ( $this->getIsWrappedHtml() ) {
 289                                 // This is a special output mode mainly intended for ApiSandbox use
 290                                 $time = microtime( true ) - $this->getConfig()->get( 'RequestTime' );
 291                                 $json = FormatJson::encode(
 292                                         [
 293                                                 'status' => (int)( $this->mHttpStatus ?: 200 ),
 294                                                 'statustext' => HttpStatus::getMessage( $this->mHttpStatus ?: 200 ),
 295                                                 'html' => $out->getHTML(),
 296                                                 'modules' => array_values( array_unique( array_merge(
 297                                                         $out->getModules(),
 298                                                         $out->getModuleScripts(),
 299                                                         $out->getModuleStyles()
 300                                                 ) ) ),
 301                                                 'continue' => $this->getResult()->getResultData( 'continue' ),
 302                                                 'time' => round( $time * 1000 ),
 303                                         ],
 304                                         false, FormatJson::ALL_OK
 305                                 );
 306
 307                                 // T68776: wfMangleFlashPolicy() is needed to avoid a nasty bug in
 308                                 // Flash, but what it does isn't friendly for the API, so we need to
 309                                 // work around it.
 310                                 if ( preg_match( '/\<\s*cross-domain-policy\s*\>/i', $json ) ) {
 311                                         $json = preg_replace(
 312                                                 '/\<(\s*cross-domain-policy\s*)\>/i', '\\u003C$1\\u003E', $json
 313                                         );
 314                                 }
 315
 316                                 echo $json;
 317                         } else {
 318                                 // API handles its own clickjacking protection.
 319                                 // Note, that $wgBreakFrames will still override $wgApiFrameOptions for format mode.
 320                                 $out->allowClickjacking();
 321                                 $out->output();
 322                         }
 323                 } else {
 324                         // For non-HTML output, clear all errors that might have been
 325                         // displayed if display_errors=On
 326                         ob_clean();
 327
 328                         echo $this->getBuffer();
 329                 }
 330         }
 331
 332         /**
 333          * Append text to the output buffer.
 334          * @param string $text
 335          */
 336         public function printText( $text ) {
 337                 $this->mBuffer .= $text;
 338         }
 339
 340         /**
 341          * Get the contents of the buffer.
 342          * @return string
 343          */
 344         public function getBuffer() {
 345                 return $this->mBuffer;
 346         }
 347
 348         public function getAllowedParams() {
 349                 $ret = [];
 350                 if ( $this->getIsHtml() ) {
 351                         $ret['wrappedhtml'] = [
 352                                 ApiBase::PARAM_DFLT => false,
 353                                 ApiBase::PARAM_HELP_MSG => 'apihelp-format-param-wrappedhtml',
 354
 355                         ];
 356                 }
 357                 return $ret;
 358         }
 359
 360         protected function getExamplesMessages() {
 361                 return [
 362                         'action=query&meta=siteinfo&siprop=namespaces&format=' . $this->getModuleName()
 363                                 => [ 'apihelp-format-example-generic', $this->getFormat() ]
 364                 ];
 365         }
 366
 367         public function getHelpUrls() {
 368                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Data_formats';
 369         }
 370
 371 }
 372
 373 /**
 374  * For really cool vim folding this needs to be at the end:
 375  * vim: foldmarker=@{,@} foldmethod=marker
 376  */