MediaWiki  1.27.1
OutputHandler.php
Go to the documentation of this file.
1 <?php
30 function wfOutputHandler( $s ) {
32  if ( $wgMangleFlashPolicy ) {
34  }
35  if ( $wgValidateAllHtml ) {
36  $headers = headers_list();
37  $isHTML = false;
38  foreach ( $headers as $header ) {
39  $parts = explode( ':', $header, 2 );
40  if ( count( $parts ) !== 2 ) {
41  continue;
42  }
43  $name = strtolower( trim( $parts[0] ) );
44  $value = trim( $parts[1] );
45  if ( $name == 'content-type' && ( strpos( $value, 'text/html' ) === 0
46  || strpos( $value, 'application/xhtml+xml' ) === 0 )
47  ) {
48  $isHTML = true;
49  break;
50  }
51  }
52  if ( $isHTML ) {
54  }
55  }
56  if ( !$wgDisableOutputCompression && !ini_get( 'zlib.output_compression' ) ) {
57  if ( !defined( 'MW_NO_OUTPUT_COMPRESSION' ) ) {
58  $s = wfGzipHandler( $s );
59  }
60  if ( !ini_get( 'output_handler' ) ) {
61  wfDoContentLength( strlen( $s ) );
62  }
63  }
64  return $s;
65 }
66 
75 function wfRequestExtension() {
77  if ( isset( $_SERVER['REQUEST_URI'] ) ) {
78  // Strip the query string...
79  list( $path ) = explode( '?', $_SERVER['REQUEST_URI'], 2 );
80  } elseif ( isset( $_SERVER['SCRIPT_NAME'] ) ) {
81  // Probably IIS. QUERY_STRING appears separately.
82  $path = $_SERVER['SCRIPT_NAME'];
83  } else {
84  // Can't get the path from the server? :(
85  return '';
86  }
87 
88  $period = strrpos( $path, '.' );
89  if ( $period !== false ) {
90  return strtolower( substr( $path, $period ) );
91  }
92  return '';
93 }
94 
103 function wfGzipHandler( $s ) {
104  if ( !function_exists( 'gzencode' ) ) {
105  wfDebug( __FUNCTION__ . "() skipping compression (gzencode unavailable)\n" );
106  return $s;
107  }
108  if ( headers_sent() ) {
109  wfDebug( __FUNCTION__ . "() skipping compression (headers already sent)\n" );
110  return $s;
111  }
112 
114  if ( $ext == '.gz' || $ext == '.tgz' ) {
115  // Don't do gzip compression if the URL path ends in .gz or .tgz
116  // This confuses Safari and triggers a download of the page,
117  // even though it's pretty clearly labeled as viewable HTML.
118  // Bad Safari! Bad!
119  return $s;
120  }
121 
122  if ( wfClientAcceptsGzip() ) {
123  wfDebug( __FUNCTION__ . "() is compressing output\n" );
124  header( 'Content-Encoding: gzip' );
125  $s = gzencode( $s, 6 );
126  }
127 
128  // Set vary header if it hasn't been set already
129  $headers = headers_list();
130  $foundVary = false;
131  foreach ( $headers as $header ) {
132  $headerName = strtolower( substr( $header, 0, 5 ) );
133  if ( $headerName == 'vary:' ) {
134  $foundVary = true;
135  break;
136  }
137  }
138  if ( !$foundVary ) {
139  header( 'Vary: Accept-Encoding' );
141  if ( $wgUseKeyHeader ) {
142  header( 'Key: Accept-Encoding;match=gzip' );
143  }
144  }
145  return $s;
146 }
147 
155 function wfMangleFlashPolicy( $s ) {
156  # Avoid weird excessive memory usage in PCRE on big articles
157  if ( preg_match( '/<\s*cross-domain-policy(?=\s|>)/i', $s ) ) {
158  return preg_replace( '/<(\s*)(cross-domain-policy(?=\s|>))/i', '<$1NOT-$2', $s );
159  } else {
160  return $s;
161  }
162 }
163 
169 function wfDoContentLength( $length ) {
170  if ( !headers_sent()
171  && isset( $_SERVER['SERVER_PROTOCOL'] )
172  && $_SERVER['SERVER_PROTOCOL'] == 'HTTP/1.0'
173  ) {
174  header( "Content-Length: $length" );
175  }
176 }
177 
186 
187  $errors = '';
188  if ( MWTidy::checkErrors( $s, $errors ) ) {
189  return $s;
190  }
191 
192  header( 'Cache-Control: no-cache' );
193 
194  $out = Html::element( 'h1', null, 'HTML validation error' );
195  $out .= Html::openElement( 'ul' );
196 
197  $error = strtok( $errors, "\n" );
198  $badLines = [];
199  while ( $error !== false ) {
200  if ( preg_match( '/^line (\d+)/', $error, $m ) ) {
201  $lineNum = intval( $m[1] );
202  $badLines[$lineNum] = true;
203  $out .= Html::rawElement( 'li', null,
204  Html::element( 'a', [ 'href' => "#line-{$lineNum}" ], $error ) ) . "\n";
205  }
206  $error = strtok( "\n" );
207  }
208 
209  $out .= Html::closeElement( 'ul' );
210  $out .= Html::element( 'pre', null, $errors );
211  $out .= Html::openElement( 'ol' ) . "\n";
212  $line = strtok( $s, "\n" );
213  $i = 1;
214  while ( $line !== false ) {
215  $attrs = [];
216  if ( isset( $badLines[$i] ) ) {
217  $attrs['class'] = 'highlight';
218  $attrs['id'] = "line-$i";
219  }
220  $out .= Html::element( 'li', $attrs, $line ) . "\n";
221  $line = strtok( "\n" );
222  $i++;
223  }
224  $out .= Html::closeElement( 'ol' );
225 
226  $style = <<<CSS
227 .highlight { background-color: #ffc }
228 li { white-space: pre }
229 CSS;
230 
231  $out = Html::htmlHeader( [ 'lang' => 'en', 'dir' => 'ltr' ] ) .
232  Html::rawElement( 'head', null,
233  Html::element( 'title', null, 'HTML validation error' ) .
234  Html::inlineStyle( $style ) ) .
235  Html::rawElement( 'body', null, $out ) .
236  Html::closeElement( 'html' );
237 
238  return $out;
239 }
static closeElement($element)
Returns "".
Definition: Html.php:306
deferred txt A few of the database updates required by various functions here can be deferred until after the result page is displayed to the user For updating the view updating the linked to tables after a etc PHP does not yet have any way to tell the server to actually return and disconnect while still running these but it might have such a feature in the future We handle these by creating a deferred update object and putting those objects on a global list
Definition: deferred.txt:11
this hook is for auditing only or null if authentication failed before getting that far or null if we can t even determine that probably a stub it is not rendered in wiki pages or galleries in category pages allow injecting custom HTML after the section Any uses of the hook need to handle escaping see BaseTemplate::getToolbox and BaseTemplate::makeListItem for details on the format of individual items inside of this array or by returning and letting standard HTTP rendering take place modifiable or by returning false and taking over the output $out
Definition: hooks.txt:762
$wgUseKeyHeader
Send the Key HTTP header for better caching.
static rawElement($element, $attribs=[], $contents= '')
Returns an HTML element in a string.
Definition: Html.php:210
static checkErrors($text, &$errorStr=null)
Check HTML for errors, used if $wgValidateAllHtml = true.
Definition: MWTidy.php:79
$value
$wgDisableOutputCompression
Disable output compression (enabled by default if zlib is available)
when a variable name is used in a it is silently declared as a new local masking the global
Definition: design.txt:93
$wgValidateAllHtml
Validate the overall output using tidy and refuse to display the page if it's not valid...
wfDebug($text, $dest= 'all', array $context=[])
Sends a line to the debug log if enabled or, optionally, to a comment in output.
wfGzipHandler($s)
Handler that compresses data with gzip if allowed by the Accept header.
static openElement($element, $attribs=[])
Identical to rawElement(), but has no third parameter and omits the end tag (and the self-closing '/'...
Definition: Html.php:248
wfOutputHandler($s)
Standard output handler for use with ob_start.
wfClientAcceptsGzip($force=false)
wfDoContentLength($length)
Add a Content-Length header if possible.
wfHtmlValidationHandler($s)
Replace the output with an error if the HTML is not valid.
static inlineStyle($contents, $media= 'all')
Output a "