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         protected $mForceDefaultParams = false;
  36
  37         /**
  38          * If $format ends with 'fm', pretty-print the output in HTML.
  39          * @param ApiMain $main
  40          * @param string $format Format name
  41          */
  42         public function __construct( ApiMain $main, $format ) {
  43                 parent::__construct( $main, $format );
  44
  45                 $this->mIsHtml = ( substr( $format, -2, 2 ) === 'fm' ); // ends with 'fm'
  46                 if ( $this->mIsHtml ) {
  47                         $this->mFormat = substr( $format, 0, -2 ); // remove ending 'fm'
  48                 } else {
  49                         $this->mFormat = $format;
  50                 }
  51                 $this->mFormat = strtoupper( $this->mFormat );
  52         }
  53
  54         /**
  55          * Overriding class returns the MIME type that should be sent to the client.
  56          *
  57          * When getIsHtml() returns true, the return value here is used for syntax
  58          * highlighting but the client sees text/html.
  59          *
  60          * @return string
  61          */
  62         abstract public function getMimeType();
  63
  64         /**
  65          * Get the internal format name
  66          * @return string
  67          */
  68         public function getFormat() {
  69                 return $this->mFormat;
  70         }
  71
  72         /**
  73          * Returns true when the HTML pretty-printer should be used.
  74          * The default implementation assumes that formats ending with 'fm'
  75          * should be formatted in HTML.
  76          * @return bool
  77          */
  78         public function getIsHtml() {
  79                 return $this->mIsHtml;
  80         }
  81
  82         /**
  83          * Disable the formatter.
  84          *
  85          * This causes calls to initPrinter() and closePrinter() to be ignored.
  86          */
  87         public function disable() {
  88                 $this->mDisabled = true;
  89         }
  90
  91         /**
  92          * Whether the printer is disabled
  93          * @return bool
  94          */
  95         public function isDisabled() {
  96                 return $this->mDisabled;
  97         }
  98
  99         /**
 100          * Whether this formatter can handle printing API errors.
 101          *
 102          * If this returns false, then on API errors the default printer will be
 103          * instantiated.
 104          * @since 1.23
 105          * @return bool
 106          */
 107         public function canPrintErrors() {
 108                 return true;
 109         }
 110
 111         /**
 112          * Ignore request parameters, force a default.
 113          *
 114          * Used as a fallback if errors are being thrown.
 115          * @since 1.26
 116          */
 117         public function forceDefaultParams() {
 118                 $this->mForceDefaultParams = true;
 119         }
 120
 121         /**
 122          * Overridden to honor $this->forceDefaultParams(), if applicable
 123          * @since 1.26
 124          */
 125         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 126                 if ( !$this->mForceDefaultParams ) {
 127                         return parent::getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 128                 }
 129
 130                 if ( !is_array( $paramSettings ) ) {
 131                         return $paramSettings;
 132                 } elseif ( isset( $paramSettings[self::PARAM_DFLT] ) ) {
 133                         return $paramSettings[self::PARAM_DFLT];
 134                 } else {
 135                         return null;
 136                 }
 137         }
 138
 139         /**
 140          * Initialize the printer function and prepare the output headers.
 141          * @param bool $unused Always false since 1.25
 142          */
 143         function initPrinter( $unused = false ) {
 144                 if ( $this->mDisabled ) {
 145                         return;
 146                 }
 147
 148                 $mime = $this->getIsHtml() ? 'text/html' : $this->getMimeType();
 149
 150                 // Some printers (ex. Feed) do their own header settings,
 151                 // in which case $mime will be set to null
 152                 if ( $mime === null ) {
 153                         return; // skip any initialization
 154                 }
 155
 156                 $this->getMain()->getRequest()->response()->header( "Content-Type: $mime; charset=utf-8" );
 157
 158                 // Set X-Frame-Options API results (bug 39180)
 159                 $apiFrameOptions = $this->getConfig()->get( 'ApiFrameOptions' );
 160                 if ( $apiFrameOptions ) {
 161                         $this->getMain()->getRequest()->response()->header( "X-Frame-Options: $apiFrameOptions" );
 162                 }
 163         }
 164
 165         /**
 166          * Finish printing and output buffered data.
 167          */
 168         public function closePrinter() {
 169                 if ( $this->mDisabled ) {
 170                         return;
 171                 }
 172
 173                 $mime = $this->getMimeType();
 174                 if ( $this->getIsHtml() && $mime !== null ) {
 175                         $format = $this->getFormat();
 176                         $lcformat = strtolower( $format );
 177                         $result = $this->getBuffer();
 178
 179                         $context = new DerivativeContext( $this->getMain() );
 180                         $context->setSkin( SkinFactory::getDefaultInstance()->makeSkin( 'apioutput' ) );
 181                         $context->setTitle( SpecialPage::getTitleFor( 'ApiHelp' ) );
 182                         $out = new OutputPage( $context );
 183                         $context->setOutput( $out );
 184
 185                         $out->addModuleStyles( 'mediawiki.apipretty' );
 186                         $out->setPageTitle( $context->msg( 'api-format-title' ) );
 187
 188                         // When the format without suffix 'fm' is defined, there is a non-html version
 189                         if ( $this->getMain()->getModuleManager()->isDefined( $lcformat, 'format' ) ) {
 190                                 $msg = $context->msg( 'api-format-prettyprint-header' )->params( $format, $lcformat );
 191                         } else {
 192                                 $msg = $context->msg( 'api-format-prettyprint-header-only-html' )->params( $format );
 193                         }
 194
 195                         $header = $msg->parseAsBlock();
 196                         $out->addHTML(
 197                                 Html::rawElement( 'div', array( 'class' => 'api-pretty-header' ),
 198                                         ApiHelp::fixHelpLinks( $header )
 199                                 )
 200                         );
 201
 202                         if ( Hooks::run( 'ApiFormatHighlight', array( $context, $result, $mime, $format ) ) ) {
 203                                 $out->addHTML(
 204                                         Html::element( 'pre', array( 'class' => 'api-pretty-content' ), $result )
 205                                 );
 206                         }
 207
 208                         // API handles its own clickjacking protection.
 209                         // Note, that $wgBreakFrames will still override $wgApiFrameOptions for format mode.
 210                         $out->allowClickjacking();
 211                         $out->output();
 212                 } else {
 213                         // For non-HTML output, clear all errors that might have been
 214                         // displayed if display_errors=On
 215                         ob_clean();
 216
 217                         echo $this->getBuffer();
 218                 }
 219         }
 220
 221         /**
 222          * Append text to the output buffer.
 223          * @param string $text
 224          */
 225         public function printText( $text ) {
 226                 $this->mBuffer .= $text;
 227         }
 228
 229         /**
 230          * Get the contents of the buffer.
 231          * @return string
 232          */
 233         public function getBuffer() {
 234                 return $this->mBuffer;
 235         }
 236
 237         protected function getExamplesMessages() {
 238                 return array(
 239                         'action=query&meta=siteinfo&siprop=namespaces&format=' . $this->getModuleName()
 240                                 => array( 'apihelp-format-example-generic', $this->getFormat() )
 241                 );
 242         }
 243
 244         public function getHelpUrls() {
 245                 return 'https://www.mediawiki.org/wiki/API:Data_formats';
 246         }
 247
 248         /************************************************************************//**
 249          * @name   Deprecated
 250          * @{
 251          */
 252
 253         /**
 254          * Specify whether or not sequences like &amp;quot; should be unescaped
 255          * to &quot; . This should only be set to true for the help message
 256          * when rendered in the default (xmlfm) format. This is a temporary
 257          * special-case fix that should be removed once the help has been
 258          * reworked to use a fully HTML interface.
 259          *
 260          * @deprecated since 1.25
 261          * @param bool $b Whether or not ampersands should be escaped.
 262          */
 263         public function setUnescapeAmps( $b ) {
 264                 wfDeprecated( __METHOD__, '1.25' );
 265                 $this->mUnescapeAmps = $b;
 266         }
 267
 268         /**
 269          * Whether this formatter can format the help message in a nice way.
 270          * By default, this returns the same as getIsHtml().
 271          * When action=help is set explicitly, the help will always be shown
 272          * @deprecated since 1.25
 273          * @return bool
 274          */
 275         public function getWantsHelp() {
 276                 wfDeprecated( __METHOD__, '1.25' );
 277                 return $this->getIsHtml();
 278         }
 279
 280         /**
 281          * Sets whether the pretty-printer should format *bold*
 282          * @deprecated since 1.25
 283          * @param bool $help
 284          */
 285         public function setHelp( $help = true ) {
 286                 wfDeprecated( __METHOD__, '1.25' );
 287                 $this->mHelp = $help;
 288         }
 289
 290         /**
 291          * Pretty-print various elements in HTML format, such as xml tags and
 292          * URLs. This method also escapes characters like <
 293          * @deprecated since 1.25
 294          * @param string $text
 295          * @return string
 296          */
 297         protected function formatHTML( $text ) {
 298                 wfDeprecated( __METHOD__, '1.25' );
 299
 300                 // Escape everything first for full coverage
 301                 $text = htmlspecialchars( $text );
 302
 303                 if ( $this->mFormat === 'XML' ) {
 304                         // encode all comments or tags as safe blue strings
 305                         $text = str_replace( '&lt;', '<span style="color:blue;">&lt;', $text );
 306                         $text = str_replace( '&gt;', '&gt;</span>', $text );
 307                 }
 308
 309                 // identify requests to api.php
 310                 $text = preg_replace( '#^(\s*)(api\.php\?[^ <\n\t]+)$#m', '\1<a href="\2">\2</a>', $text );
 311                 if ( $this->mHelp ) {
 312                         // make lines inside * bold
 313                         $text = preg_replace( '#^(\s*)(\*[^<>\n]+\*)(\s*)$#m', '$1<b>$2</b>$3', $text );
 314                 }
 315
 316                 // Armor links (bug 61362)
 317                 $masked = array();
 318                 $text = preg_replace_callback( '#<a .*?</a>#', function ( $matches ) use ( &$masked ) {
 319                         $sha = sha1( $matches[0] );
 320                         $masked[$sha] = $matches[0];
 321                         return "<$sha>";
 322                 }, $text );
 323
 324                 // identify URLs
 325                 $protos = wfUrlProtocolsWithoutProtRel();
 326                 // This regex hacks around bug 13218 (&quot; included in the URL)
 327                 $text = preg_replace(
 328                         "#(((?i)$protos).*?)(&quot;)?([ \\'\"<>\n]|&lt;|&gt;|&quot;)#",
 329                         '<a href="\\1">\\1</a>\\3\\4',
 330                         $text
 331                 );
 332
 333                 // Unarmor links
 334                 $text = preg_replace_callback( '#<([0-9a-f]{40})>#', function ( $matches ) use ( &$masked ) {
 335                         $sha = $matches[1];
 336                         return isset( $masked[$sha] ) ? $masked[$sha] : $matches[0];
 337                 }, $text );
 338
 339                 /**
 340                  * Temporary fix for bad links in help messages. As a special case,
 341                  * XML-escaped metachars are de-escaped one level in the help message
 342                  * for legibility. Should be removed once we have completed a fully-HTML
 343                  * version of the help message.
 344                  */
 345                 if ( $this->mUnescapeAmps ) {
 346                         $text = preg_replace( '/&amp;(amp|quot|lt|gt);/', '&\1;', $text );
 347                 }
 348
 349                 return $text;
 350         }
 351
 352         /**
 353          * @see ApiBase::getDescription
 354          * @deprecated since 1.25
 355          */
 356         public function getDescription() {
 357                 return $this->getIsHtml() ? ' (pretty-print in HTML)' : '';
 358         }
 359
 360         /**
 361          * Set the flag to buffer the result instead of printing it.
 362          * @deprecated since 1.25, output is always buffered
 363          * @param bool $value
 364          */
 365         public function setBufferResult( $value ) {
 366         }
 367
 368         /**
 369          * Formerly indicated whether the formatter needed metadata from ApiResult.
 370          *
 371          * ApiResult previously (indirectly) used this to decide whether to add
 372          * metadata or to ignore calls to metadata-setting methods, which
 373          * unfortunately made several methods that should have been static have to
 374          * be dynamic instead. Now ApiResult always stores metadata and formatters
 375          * are required to ignore it or filter it out.
 376          *
 377          * @deprecated since 1.25
 378          * @return bool Always true
 379          */
 380         public function getNeedsRawData() {
 381                 wfDeprecated( __METHOD__, '1.25' );
 382                 return true;
 383         }
 384
 385         /**@}*/
 386 }
 387
 388 /**
 389  * For really cool vim folding this needs to be at the end:
 390  * vim: foldmarker=@{,@} foldmethod=marker
 391  */