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