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-rw-r--r--includes/StreamFile.php235
1 files changed, 142 insertions, 93 deletions
diff --git a/includes/StreamFile.php b/includes/StreamFile.php
index d08cfec6..0de03c83 100644
--- a/includes/StreamFile.php
+++ b/includes/StreamFile.php
@@ -4,119 +4,168 @@
*
* @file
*/
+class StreamFile {
+ const READY_STREAM = 1;
+ const NOT_MODIFIED = 2;
-/**
- * @param $fname string
- * @param $headers array
- */
-function wfStreamFile( $fname, $headers = array() ) {
- wfSuppressWarnings();
- $stat = stat( $fname );
- wfRestoreWarnings();
- if ( !$stat ) {
- header( 'HTTP/1.0 404 Not Found' );
- header( 'Cache-Control: no-cache' );
- header( 'Content-Type: text/html; charset=utf-8' );
- $encFile = htmlspecialchars( $fname );
- $encScript = htmlspecialchars( $_SERVER['SCRIPT_NAME'] );
- echo "<html><body>
-<h1>File not found</h1>
-<p>Although this PHP script ($encScript) exists, the file requested for output
-($encFile) does not.</p>
-</body></html>
-";
- return;
- }
+ /**
+ * Stream a file to the browser, adding all the headings and fun stuff.
+ * Headers sent include: Content-type, Content-Length, Last-Modified,
+ * and Content-Disposition.
+ *
+ * @param $fname string Full name and path of the file to stream
+ * @param $headers array Any additional headers to send
+ * @param $sendErrors bool Send error messages if errors occur (like 404)
+ * @return bool Success
+ */
+ public static function stream( $fname, $headers = array(), $sendErrors = true ) {
+ wfSuppressWarnings();
+ $stat = stat( $fname );
+ wfRestoreWarnings();
- header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', $stat['mtime'] ) . ' GMT' );
+ $res = self::prepareForStream( $fname, $stat, $headers, $sendErrors );
+ if ( $res == self::NOT_MODIFIED ) {
+ return true; // use client cache
+ } elseif ( $res == self::READY_STREAM ) {
+ return readfile( $fname );
+ } else {
+ return false; // failed
+ }
+ }
- // Cancel output buffering and gzipping if set
- wfResetOutputBuffers();
+ /**
+ * Call this function used in preparation before streaming a file.
+ * This function does the following:
+ * (a) sends Last-Modified, Content-type, and Content-Disposition headers
+ * (b) cancels any PHP output buffering and automatic gzipping of output
+ * (c) sends Content-Length header based on HTTP_IF_MODIFIED_SINCE check
+ *
+ * @param $path string Storage path or file system path
+ * @param $info Array|false File stat info with 'mtime' and 'size' fields
+ * @param $headers Array Additional headers to send
+ * @param $sendErrors bool Send error messages if errors occur (like 404)
+ * @return int|false READY_STREAM, NOT_MODIFIED, or false on failure
+ */
+ public static function prepareForStream(
+ $path, $info, $headers = array(), $sendErrors = true
+ ) {
+ global $wgLanguageCode;
- $type = wfGetType( $fname );
- if ( $type and $type!="unknown/unknown") {
- header("Content-type: $type");
- } else {
- header('Content-type: application/x-wiki');
- }
+ if ( !is_array( $info ) ) {
+ if ( $sendErrors ) {
+ header( 'HTTP/1.0 404 Not Found' );
+ header( 'Cache-Control: no-cache' );
+ header( 'Content-Type: text/html; charset=utf-8' );
+ $encFile = htmlspecialchars( $path );
+ $encScript = htmlspecialchars( $_SERVER['SCRIPT_NAME'] );
+ echo "<html><body>
+ <h1>File not found</h1>
+ <p>Although this PHP script ($encScript) exists, the file requested for output
+ ($encFile) does not.</p>
+ </body></html>
+ ";
+ }
+ return false;
+ }
- // Don't stream it out as text/html if there was a PHP error
- if ( headers_sent() ) {
- echo "Headers already sent, terminating.\n";
- return;
- }
+ // Sent Last-Modified HTTP header for client-side caching
+ header( 'Last-Modified: ' . wfTimestamp( TS_RFC2822, $info['mtime'] ) );
- global $wgLanguageCode;
- header( "Content-Disposition: inline;filename*=utf-8'$wgLanguageCode'" . urlencode( basename( $fname ) ) );
+ // Cancel output buffering and gzipping if set
+ wfResetOutputBuffers();
- foreach ( $headers as $header ) {
- header( $header );
- }
+ $type = self::contentTypeFromPath( $path );
+ if ( $type && $type != 'unknown/unknown' ) {
+ header( "Content-type: $type" );
+ } else {
+ // Send a content type which is not known to Internet Explorer, to
+ // avoid triggering IE's content type detection. Sending a standard
+ // unknown content type here essentially gives IE license to apply
+ // whatever content type it likes.
+ header( 'Content-type: application/x-wiki' );
+ }
- if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
- $modsince = preg_replace( '/;.*$/', '', $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
- $sinceTime = strtotime( $modsince );
- if ( $stat['mtime'] <= $sinceTime ) {
- ini_set('zlib.output_compression', 0);
- header( "HTTP/1.0 304 Not Modified" );
- return;
+ // Don't stream it out as text/html if there was a PHP error
+ if ( headers_sent() ) {
+ echo "Headers already sent, terminating.\n";
+ return false;
}
- }
- header( 'Content-Length: ' . $stat['size'] );
+ header( "Content-Disposition: inline;filename*=utf-8'$wgLanguageCode'" .
+ urlencode( basename( $path ) ) );
- readfile( $fname );
-}
+ // Send additional headers
+ foreach ( $headers as $header ) {
+ header( $header );
+ }
-/**
- * @param $filename string
- * @param $safe bool
- * @return null|string
- */
-function wfGetType( $filename, $safe = true ) {
- global $wgTrivialMimeDetection;
-
- $ext = strrchr($filename, '.');
- $ext = $ext === false ? '' : strtolower( substr( $ext, 1 ) );
-
- # trivial detection by file extension,
- # used for thumbnails (thumb.php)
- if ($wgTrivialMimeDetection) {
- switch ($ext) {
- case 'gif': return 'image/gif';
- case 'png': return 'image/png';
- case 'jpg': return 'image/jpeg';
- case 'jpeg': return 'image/jpeg';
+ // Don't send if client has up to date cache
+ if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
+ $modsince = preg_replace( '/;.*$/', '', $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
+ if ( wfTimestamp( TS_UNIX, $info['mtime'] ) <= strtotime( $modsince ) ) {
+ ini_set( 'zlib.output_compression', 0 );
+ header( "HTTP/1.0 304 Not Modified" );
+ return self::NOT_MODIFIED; // ok
+ }
}
- return 'unknown/unknown';
+ header( 'Content-Length: ' . $info['size'] );
+
+ return self::READY_STREAM; // ok
}
-
- $magic = MimeMagic::singleton();
- // Use the extension only, rather than magic numbers, to avoid opening
- // up vulnerabilities due to uploads of files with allowed extensions
- // but disallowed types.
- $type = $magic->guessTypesForExtension( $ext );
/**
- * Double-check some security settings that were done on upload but might
- * have changed since.
+ * Determine the file type of a file based on the path
+ *
+ * @param $filename string Storage path or file system path
+ * @param $safe bool Whether to do retroactive upload blacklist checks
+ * @return null|string
*/
- if ( $safe ) {
- global $wgFileBlacklist, $wgCheckFileExtensions, $wgStrictFileExtensions,
- $wgFileExtensions, $wgVerifyMimeType, $wgMimeTypeBlacklist;
- list( , $extList ) = UploadBase::splitExtensions( $filename );
- if ( UploadBase::checkFileExtensionList( $extList, $wgFileBlacklist ) ) {
- return 'unknown/unknown';
- }
- if ( $wgCheckFileExtensions && $wgStrictFileExtensions
- && !UploadBase::checkFileExtensionList( $extList, $wgFileExtensions ) )
- {
+ public static function contentTypeFromPath( $filename, $safe = true ) {
+ global $wgTrivialMimeDetection;
+
+ $ext = strrchr( $filename, '.' );
+ $ext = $ext === false ? '' : strtolower( substr( $ext, 1 ) );
+
+ # trivial detection by file extension,
+ # used for thumbnails (thumb.php)
+ if ( $wgTrivialMimeDetection ) {
+ switch ( $ext ) {
+ case 'gif': return 'image/gif';
+ case 'png': return 'image/png';
+ case 'jpg': return 'image/jpeg';
+ case 'jpeg': return 'image/jpeg';
+ }
+
return 'unknown/unknown';
}
- if ( $wgVerifyMimeType && in_array( strtolower( $type ), $wgMimeTypeBlacklist ) ) {
- return 'unknown/unknown';
+
+ $magic = MimeMagic::singleton();
+ // Use the extension only, rather than magic numbers, to avoid opening
+ // up vulnerabilities due to uploads of files with allowed extensions
+ // but disallowed types.
+ $type = $magic->guessTypesForExtension( $ext );
+
+ /**
+ * Double-check some security settings that were done on upload but might
+ * have changed since.
+ */
+ if ( $safe ) {
+ global $wgFileBlacklist, $wgCheckFileExtensions, $wgStrictFileExtensions,
+ $wgFileExtensions, $wgVerifyMimeType, $wgMimeTypeBlacklist;
+ list( , $extList ) = UploadBase::splitExtensions( $filename );
+ if ( UploadBase::checkFileExtensionList( $extList, $wgFileBlacklist ) ) {
+ return 'unknown/unknown';
+ }
+ if ( $wgCheckFileExtensions && $wgStrictFileExtensions
+ && !UploadBase::checkFileExtensionList( $extList, $wgFileExtensions ) )
+ {
+ return 'unknown/unknown';
+ }
+ if ( $wgVerifyMimeType && in_array( strtolower( $type ), $wgMimeTypeBlacklist ) ) {
+ return 'unknown/unknown';
+ }
}
+ return $type;
}
- return $type;
}
generated by cgit v1.2.2 (git 2.25.0) at 2024-05-09 22:24:38 +0000