merge master in branch

1 files changed, 152 insertions, 0 deletions

diff --git a/inc/fetch.functions.php b/inc/fetch.functions.php
new file mode 100644
index 000000000..53ade3555
--- /dev/null
+++ b/inc/fetch.functions.php
@@ -0,0 +1,152 @@
+<?php 
+/**
+ * Functions used by lib/exe/fetch.php
+ * (not included by other parts of dokuwiki)
+ */
+
+/**
+ * Set headers and send the file to the client
+ *
+ * The $cache parameter influences how long files may be kept in caches, the $public parameter
+ * influences if this caching may happen in public proxis or in the browser cache only FS#2734
+ *
+ * This function will abort the current script when a 304 is sent or file sending is handled
+ * through x-sendfile
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @author Ben Coburn <btcoburn@silicodon.net>
+ * @param string $file   local file to send
+ * @param string $mime   mime type of the file
+ * @param bool   $dl     set to true to force a browser download
+ * @param int    $cache  remaining cache time in seconds (-1 for $conf['cache'], 0 for no-cache)
+ * @param bool   $public is this a public ressource or a private one?
+ */
+function sendFile($file, $mime, $dl, $cache, $public = false) {
+    global $conf;
+    // send mime headers
+    header("Content-Type: $mime");
+
+    // calculate cache times
+    if($cache == -1) {
+        $maxage  = max($conf['cachetime'], 3600); // cachetime or one hour
+        $expires = time() + $maxage;
+    } else if($cache > 0) {
+        $maxage  = $cache; // given time
+        $expires = time() + $maxage;
+    } else { // $cache == 0
+        $maxage  = 0;
+        $expires = 0; // 1970-01-01
+    }
+
+    // smart http caching headers
+    if($maxage) {
+        if($public) {
+            // cache publically
+            header('Expires: '.gmdate("D, d M Y H:i:s", $expires).' GMT');
+            header('Cache-Control: public, proxy-revalidate, no-transform, max-age='.$maxage);
+            header('Pragma: public');
+        } else {
+            // cache in browser
+            header('Expires: '.gmdate("D, d M Y H:i:s", $expires).' GMT');
+            header('Cache-Control: private, no-transform, max-age='.$maxage);
+            header('Pragma: no-cache');
+        }
+    } else {
+        // no cache at all
+        header('Expires: Thu, 01 Jan 1970 00:00:00 GMT');
+        header('Cache-Control: no-cache, no-transform');
+        header('Pragma: no-cache');
+    }
+
+    //send important headers first, script stops here if '304 Not Modified' response
+    $fmtime = @filemtime($file);
+    http_conditionalRequest($fmtime);
+
+    //download or display?
+    if($dl) {
+        header('Content-Disposition: attachment; filename="'.utf8_basename($file).'";');
+    } else {
+        header('Content-Disposition: inline; filename="'.utf8_basename($file).'";');
+    }
+
+    //use x-sendfile header to pass the delivery to compatible webservers
+    if(http_sendfile($file)) exit;
+
+    // send file contents
+    $fp = @fopen($file, "rb");
+    if($fp) {
+        http_rangeRequest($fp, filesize($file), $mime);
+    } else {
+        http_status(500);
+        print "Could not read $file - bad permissions?";
+    }
+}
+
+/**
+ * Check for media for preconditions and return correct status code
+ *
+ * READ: MEDIA, MIME, EXT, CACHE
+ * WRITE: MEDIA, FILE, array( STATUS, STATUSMESSAGE )
+ *
+ * @author Gerry Weissbach <gerry.w@gammaproduction.de>
+ * @param string $media  reference to the media id
+ * @param string $file   reference to the file variable
+ * @param string $rev
+ * @param int    $width
+ * @param int    $height
+ * @return array(STATUS, STATUSMESSAGE)
+ */
+function checkFileStatus(&$media, &$file, $rev = '', $width=0, $height=0) {
+    global $MIME, $EXT, $CACHE, $INPUT;
+
+    //media to local file
+    if(media_isexternal($media)) {
+        //check hash
+        if(substr(PassHash::hmac('md5', $media, auth_cookiesalt()), 0, 6) !== $INPUT->str('hash')) {
+            return array(412, 'Precondition Failed');
+        }
+        //handle external images
+        if(strncmp($MIME, 'image/', 6) == 0) $file = media_get_from_URL($media, $EXT, $CACHE);
+        if(!$file) {
+            //download failed - redirect to original URL
+            return array(302, $media);
+        }
+    } else {
+        $media = cleanID($media);
+        if(empty($media)) {
+            return array(400, 'Bad request');
+        }
+        // check token for resized images
+        if (($width || $height) && media_get_token($media, $width, $height) !== $INPUT->str('tok')) {
+            return array(412, 'Precondition Failed');
+        }
+
+        //check permissions (namespace only)
+        if(auth_quickaclcheck(getNS($media).':X') < AUTH_READ) {
+            return array(403, 'Forbidden');
+        }
+        $file = mediaFN($media, $rev);
+    }
+
+    //check file existance
+    if(!@file_exists($file)) {
+        return array(404, 'Not Found');
+    }
+
+    return array(200, null);
+}
+
+/**
+ * Returns the wanted cachetime in seconds
+ *
+ * Resolves named constants
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ */
+function calc_cache($cache) {
+    global $conf;
+
+    if(strtolower($cache) == 'nocache') return 0; //never cache
+    if(strtolower($cache) == 'recache') return $conf['cachetime']; //use standard cache
+    return -1; //cache endless
+}