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
  34         private $mIsHtml, $mFormat, $mUnescapeAmps, $mHelp, $mCleared;
  35         private $mBufferResult = false, $mBuffer, $mDisabled = false;
  36
  37         /**
  38          * Constructor
  39          * If $format ends with 'fm', pretty-print the output in HTML.
  40          * @param $main ApiMain
  41          * @param $format string Format name
  42          */
  43         public function __construct( $main, $format ) {
  44                 parent::__construct( $main, $format );
  45
  46                 $this->mIsHtml = ( substr( $format, - 2, 2 ) === 'fm' ); // ends with 'fm'
  47                 if ( $this->mIsHtml ) {
  48                         $this->mFormat = substr( $format, 0, - 2 ); // remove ending 'fm'
  49                 } else {
  50                         $this->mFormat = $format;
  51                 }
  52                 $this->mFormat = strtoupper( $this->mFormat );
  53                 $this->mCleared = false;
  54         }
  55
  56         /**
  57          * Overriding class returns the mime type that should be sent to the client.
  58          * This method is not called if getIsHtml() returns true.
  59          * @return string
  60          */
  61         public abstract 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          * Specify whether or not sequences like &amp;quot; should be unescaped
  81          * to &quot; . This should only be set to true for the help message
  82          * when rendered in the default (xmlfm) format. This is a temporary
  83          * special-case fix that should be removed once the help has been
  84          * reworked to use a fully HTML interface.
  85          *
  86          * @param $b bool Whether or not ampersands should be escaped.
  87          */
  88         public function setUnescapeAmps ( $b ) {
  89                 $this->mUnescapeAmps = $b;
  90         }
  91
  92         /**
  93          * Returns true when the HTML pretty-printer should be used.
  94          * The default implementation assumes that formats ending with 'fm'
  95          * should be formatted in HTML.
  96          * @return bool
  97          */
  98         public function getIsHtml() {
  99                 return $this->mIsHtml;
 100         }
 101
 102         /**
 103          * Whether this formatter can format the help message in a nice way.
 104          * By default, this returns the same as getIsHtml().
 105          * When action=help is set explicitly, the help will always be shown
 106          * @return bool
 107          */
 108         public function getWantsHelp() {
 109                 return $this->getIsHtml();
 110         }
 111
 112         /**
 113          * Disable the formatter completely. This causes calls to initPrinter(),
 114          * printText() and closePrinter() to be ignored.
 115          */
 116         public function disable() {
 117                 $this->mDisabled = true;
 118         }
 119
 120         public function isDisabled() {
 121                 return $this->mDisabled;
 122         }
 123
 124         /**
 125          * Initialize the printer function and prepare the output headers, etc.
 126          * This method must be the first outputing method during execution.
 127          * A help screen's header is printed for the HTML-based output
 128          * @param $isError bool Whether an error message is printed
 129          */
 130         function initPrinter( $isError ) {
 131                 if ( $this->mDisabled ) {
 132                         return;
 133                 }
 134                 $isHtml = $this->getIsHtml();
 135                 $mime = $isHtml ? 'text/html' : $this->getMimeType();
 136                 $script = wfScript( 'api' );
 137
 138                 // Some printers (ex. Feed) do their own header settings,
 139                 // in which case $mime will be set to null
 140                 if ( is_null( $mime ) ) {
 141                         return; // skip any initialization
 142                 }
 143
 144                 $this->getMain()->getRequest()->response()->header( "Content-Type: $mime; charset=utf-8" );
 145
 146                 if ( $isHtml ) {
 147 ?>
 148 <!DOCTYPE HTML>
 149 <html>
 150 <head>
 151 <?php if ( $this->mUnescapeAmps ) {
 152 ?>      <title>MediaWiki API</title>
 153 <?php } else {
 154 ?>      <title>MediaWiki API Result</title>
 155 <?php } ?>
 156 </head>
 157 <body>
 158 <?php
 159
 160
 161                         if ( !$isError ) {
 162 ?>
 163 <br />
 164 <small>
 165 You are looking at the HTML representation of the <?php echo( $this->mFormat ); ?> format.<br />
 166 HTML is good for debugging, but probably is not suitable for your application.<br />
 167 See <a href='https://www.mediawiki.org/wiki/API'>complete documentation</a>, or
 168 <a href='<?php echo( $script ); ?>'>API help</a> for more information.
 169 </small>
 170 <?php
 171
 172
 173                         }
 174 ?>
 175 <pre>
 176 <?php
 177
 178
 179                 }
 180         }
 181
 182         /**
 183          * Finish printing. Closes HTML tags.
 184          */
 185         public function closePrinter() {
 186                 if ( $this->mDisabled ) {
 187                         return;
 188                 }
 189                 if ( $this->getIsHtml() ) {
 190 ?>
 191
 192 </pre>
 193 </body>
 194 </html>
 195 <?php
 196
 197
 198                 }
 199         }
 200
 201         /**
 202          * The main format printing function. Call it to output the result
 203          * string to the user. This function will automatically output HTML
 204          * when format name ends in 'fm'.
 205          * @param $text string
 206          */
 207         public function printText( $text ) {
 208                 if ( $this->mDisabled ) {
 209                         return;
 210                 }
 211                 if ( $this->mBufferResult ) {
 212                         $this->mBuffer = $text;
 213                 } elseif ( $this->getIsHtml() ) {
 214                         echo $this->formatHTML( $text );
 215                 } else {
 216                         // For non-HTML output, clear all errors that might have been
 217                         // displayed if display_errors=On
 218                         // Do this only once, of course
 219                         if ( !$this->mCleared ) {
 220                                 ob_clean();
 221                                 $this->mCleared = true;
 222                         }
 223                         echo $text;
 224                 }
 225         }
 226
 227         /**
 228          * Get the contents of the buffer.
 229          */
 230         public function getBuffer() {
 231                 return $this->mBuffer;
 232         }
 233
 234         /**
 235          * Set the flag to buffer the result instead of printing it.
 236          * @param $value bool
 237          */
 238         public function setBufferResult( $value ) {
 239                 $this->mBufferResult = $value;
 240         }
 241
 242         /**
 243          * Sets whether the pretty-printer should format *bold* and $italics$
 244          * @param $help bool
 245          */
 246         public function setHelp( $help = true ) {
 247                 $this->mHelp = $help;
 248         }
 249
 250         /**
 251          * Pretty-print various elements in HTML format, such as xml tags and
 252          * URLs. This method also escapes characters like <
 253          * @param $text string
 254          * @return string
 255          */
 256         protected function formatHTML( $text ) {
 257                 // Escape everything first for full coverage
 258                 $text = htmlspecialchars( $text );
 259
 260                 // encode all comments or tags as safe blue strings
 261                 $text = preg_replace( '/\&lt;(!--.*?--|.*?)\&gt;/', '<span style="color:blue;">&lt;\1&gt;</span>', $text );
 262                 // identify URLs
 263                 $protos = wfUrlProtocolsWithoutProtRel();
 264                 // This regex hacks around bug 13218 (&quot; included in the URL)
 265                 $text = preg_replace( "#(($protos).*?)(&quot;)?([ \\'\"<>\n]|&lt;|&gt;|&quot;)#", '<a href="\\1">\\1</a>\\3\\4', $text );
 266                 // identify requests to api.php
 267                 $text = preg_replace( "#api\\.php\\?[^ <\n\t]+#", '<a href="\\0">\\0</a>', $text );
 268                 if ( $this->mHelp ) {
 269                         // make strings inside * bold
 270                         $text = preg_replace( "#\\*[^<>\n]+\\*#", '<b>\\0</b>', $text );
 271                         // make strings inside $ italic
 272                         $text = preg_replace( "#\\$[^<>\n]+\\$#", '<b><i>\\0</i></b>', $text );
 273                 }
 274
 275                 /**
 276                  * Temporary fix for bad links in help messages. As a special case,
 277                  * XML-escaped metachars are de-escaped one level in the help message
 278                  * for legibility. Should be removed once we have completed a fully-HTML
 279                  * version of the help message.
 280                  */
 281                 if ( $this->mUnescapeAmps ) {
 282                         $text = preg_replace( '/&amp;(amp|quot|lt|gt);/', '&\1;', $text );
 283                 }
 284
 285                 return $text;
 286         }
 287
 288         public function getExamples() {
 289                 return array(
 290                         'api.php?action=query&meta=siteinfo&siprop=namespaces&format=' . $this->getModuleName()
 291                                 => "Format the query result in the {$this->getModuleName()} format",
 292                 );
 293         }
 294
 295         public function getHelpUrls() {
 296                 return 'https://www.mediawiki.org/wiki/API:Data_formats';
 297         }
 298
 299         public function getDescription() {
 300                 return $this->getIsHtml() ? ' (pretty-print in HTML)' : '';
 301         }
 302
 303         public static function getBaseVersion() {
 304                 return __CLASS__ . ': $Id$';
 305         }
 306 }
 307
 308 /**
 309  * This printer is used to wrap an instance of the Feed class
 310  * @ingroup API
 311  */
 312 class ApiFormatFeedWrapper extends ApiFormatBase {
 313
 314         public function __construct( $main ) {
 315                 parent::__construct( $main, 'feed' );
 316         }
 317
 318         /**
 319          * Call this method to initialize output data. See execute()
 320          * @param $result ApiResult
 321          * @param $feed object an instance of one of the $wgFeedClasses classes
 322          * @param $feedItems array of FeedItem objects
 323          */
 324         public static function setResult( $result, $feed, $feedItems ) {
 325                 // Store output in the Result data.
 326                 // This way we can check during execution if any error has occured
 327                 // Disable size checking for this because we can't continue
 328                 // cleanly; size checking would cause more problems than it'd
 329                 // solve
 330                 $result->disableSizeCheck();
 331                 $result->addValue( null, '_feed', $feed );
 332                 $result->addValue( null, '_feeditems', $feedItems );
 333                 $result->enableSizeCheck();
 334         }
 335
 336         /**
 337          * Feed does its own headers
 338          *
 339          * @return null
 340          */
 341         public function getMimeType() {
 342                 return null;
 343         }
 344
 345         /**
 346          * Optimization - no need to sanitize data that will not be needed
 347          *
 348          * @return bool
 349          */
 350         public function getNeedsRawData() {
 351                 return true;
 352         }
 353
 354         /**
 355          * This class expects the result data to be in a custom format set by self::setResult()
 356          * $result['_feed']             - an instance of one of the $wgFeedClasses classes
 357          * $result['_feeditems']        - an array of FeedItem instances
 358          */
 359         public function execute() {
 360                 $data = $this->getResultData();
 361                 if ( isset( $data['_feed'] ) && isset( $data['_feeditems'] ) ) {
 362                         $feed = $data['_feed'];
 363                         $items = $data['_feeditems'];
 364
 365                         $feed->outHeader();
 366                         foreach ( $items as & $item ) {
 367                                 $feed->outItem( $item );
 368                         }
 369                         $feed->outFooter();
 370                 } else {
 371                         // Error has occured, print something useful
 372                         ApiBase::dieDebug( __METHOD__, 'Invalid feed class/item' );
 373                 }
 374         }
 375
 376         public function getVersion() {
 377                 return __CLASS__ . ': $Id$';
 378         }
 379 }