201 lines
6.7 KiB
PHP
201 lines
6.7 KiB
PHP
<?php
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/**
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* Functions used by lib/exe/fetch.php
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* (not included by other parts of dokuwiki)
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*/
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/**
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* Set headers and send the file to the client
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*
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* The $cache parameter influences how long files may be kept in caches, the $public parameter
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* influences if this caching may happen in public proxis or in the browser cache only FS#2734
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*
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* This function will abort the current script when a 304 is sent or file sending is handled
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* through x-sendfile
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*
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* @param string $file local file to send
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* @param string $mime mime type of the file
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* @param bool $dl set to true to force a browser download
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* @param int $cache remaining cache time in seconds (-1 for $conf['cache'], 0 for no-cache)
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* @param bool $public is this a public ressource or a private one?
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* @param string $orig original file to send - the file name will be used for the Content-Disposition
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* @param array $csp The ContentSecurityPolicy to send
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* @author Andreas Gohr <andi@splitbrain.org>
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* @author Ben Coburn <btcoburn@silicodon.net>
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* @author Gerry Weissbach <dokuwiki@gammaproduction.de>
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*
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*/
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function sendFile($file, $mime, $dl, $cache, $public = false, $orig = null, $csp=[]) {
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global $conf;
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// send mime headers
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header("Content-Type: $mime");
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// send security policy if given
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if (!empty($csp)) dokuwiki\HTTP\Headers::contentSecurityPolicy($csp);
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// calculate cache times
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if($cache == -1) {
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$maxage = max($conf['cachetime'], 3600); // cachetime or one hour
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$expires = time() + $maxage;
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} else if($cache > 0) {
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$maxage = $cache; // given time
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$expires = time() + $maxage;
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} else { // $cache == 0
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$maxage = 0;
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$expires = 0; // 1970-01-01
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}
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// smart http caching headers
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if($maxage) {
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if($public) {
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// cache publically
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header('Expires: '.gmdate("D, d M Y H:i:s", $expires).' GMT');
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header('Cache-Control: public, proxy-revalidate, no-transform, max-age='.$maxage);
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} else {
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// cache in browser
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header('Expires: '.gmdate("D, d M Y H:i:s", $expires).' GMT');
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header('Cache-Control: private, no-transform, max-age='.$maxage);
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}
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} else {
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// no cache at all
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header('Expires: Thu, 01 Jan 1970 00:00:00 GMT');
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header('Cache-Control: no-cache, no-transform');
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}
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//send important headers first, script stops here if '304 Not Modified' response
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$fmtime = @filemtime($file);
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http_conditionalRequest($fmtime);
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// Use the current $file if is $orig is not set.
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if ( $orig == null ) {
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$orig = $file;
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}
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//download or display?
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if ($dl) {
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header('Content-Disposition: attachment;' . rfc2231_encode(
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'filename', \dokuwiki\Utf8\PhpString::basename($orig)) . ';'
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);
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} else {
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header('Content-Disposition: inline;' . rfc2231_encode(
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'filename', \dokuwiki\Utf8\PhpString::basename($orig)) . ';'
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);
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}
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//use x-sendfile header to pass the delivery to compatible webservers
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http_sendfile($file);
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// send file contents
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$fp = @fopen($file, "rb");
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if($fp) {
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http_rangeRequest($fp, filesize($file), $mime);
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} else {
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http_status(500);
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print "Could not read $file - bad permissions?";
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}
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}
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/**
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* Try an rfc2231 compatible encoding. This ensures correct
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* interpretation of filenames outside of the ASCII set.
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* This seems to be needed for file names with e.g. umlauts that
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* would otherwise decode wrongly in IE.
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*
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* There is no additional checking, just the encoding and setting the key=value for usage in headers
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*
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* @author Gerry Weissbach <gerry.w@gammaproduction.de>
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* @param string $name name of the field to be set in the header() call
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* @param string $value value of the field to be set in the header() call
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* @param string $charset used charset for the encoding of value
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* @param string $lang language used.
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* @return string in the format " name=value" for values WITHOUT special characters
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* @return string in the format " name*=charset'lang'value" for values WITH special characters
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*/
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function rfc2231_encode($name, $value, $charset='utf-8', $lang='en') {
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$internal = preg_replace_callback(
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'/[\x00-\x20*\'%()<>@,;:\\\\"\/[\]?=\x80-\xFF]/',
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function ($match) {
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return rawurlencode($match[0]);
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},
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$value
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);
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if ( $value != $internal ) {
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return ' '.$name.'*='.$charset."'".$lang."'".$internal;
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} else {
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return ' '.$name.'="'.$value.'"';
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}
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}
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/**
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* Check for media for preconditions and return correct status code
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*
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* READ: MEDIA, MIME, EXT, CACHE
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* WRITE: MEDIA, FILE, array( STATUS, STATUSMESSAGE )
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*
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* @author Gerry Weissbach <gerry.w@gammaproduction.de>
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*
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* @param string $media reference to the media id
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* @param string $file reference to the file variable
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* @param string $rev
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* @param int $width
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* @param int $height
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* @return array as array(STATUS, STATUSMESSAGE)
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*/
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function checkFileStatus(&$media, &$file, $rev = '', $width=0, $height=0) {
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global $MIME, $EXT, $CACHE, $INPUT;
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//media to local file
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if(media_isexternal($media)) {
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//check token for external image and additional for resized and cached images
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if(media_get_token($media, $width, $height) !== $INPUT->str('tok')) {
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return array(412, 'Precondition Failed');
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}
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//handle external images
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if(strncmp($MIME, 'image/', 6) == 0) $file = media_get_from_URL($media, $EXT, $CACHE);
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if(!$file) {
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//download failed - redirect to original URL
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return array(302, $media);
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}
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} else {
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$media = cleanID($media);
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if(empty($media)) {
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return array(400, 'Bad request');
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}
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// check token for resized images
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if (($width || $height) && media_get_token($media, $width, $height) !== $INPUT->str('tok')) {
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return array(412, 'Precondition Failed');
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}
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//check permissions (namespace only)
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if(auth_quickaclcheck(getNS($media).':X') < AUTH_READ) {
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return array(403, 'Forbidden');
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}
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$file = mediaFN($media, $rev);
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}
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//check file existance
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if(!file_exists($file)) {
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return array(404, 'Not Found');
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}
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return array(200, null);
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}
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/**
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* Returns the wanted cachetime in seconds
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*
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* Resolves named constants
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*
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* @param string $cache
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* @return int cachetime in seconds
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*/
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function calc_cache($cache) {
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global $conf;
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if(strtolower($cache) == 'nocache') return 0; //never cache
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if(strtolower($cache) == 'recache') return $conf['cachetime']; //use standard cache
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return -1; //cache endless
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}
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