Mailer: avoid overlong headers in content ids FS#2868

inc/Mailer.class.php

@@ -43,7 +43,7 @@ class Mailer {
         $server = parse_url(DOKU_URL, PHP_URL_HOST);
         if(strpos($server,'.') === false) $server = $server.'.localhost';
 
-        $this->partid   = md5(uniqid(rand(), true)).'@'.$server;
+        $this->partid   = substr(md5(uniqid(rand(), true)),0, 8).'@'.$server;
         $this->boundary = '__________'.md5(uniqid(rand(), true));
 
         $listid = join('.', array_reverse(explode('/', DOKU_BASE))).$server;
@@ -430,14 +430,13 @@ class Mailer {
             }
 
             $mime .= '--'.$this->boundary.MAILHEADER_EOL;
-            $mime .= 'Content-Type: '.$media['mime'].';'.MAILHEADER_EOL.
-                     ' id="'.$cid.'"'.MAILHEADER_EOL;
-            $mime .= 'Content-Transfer-Encoding: base64'.MAILHEADER_EOL;
-            $mime .= "Content-ID: <$cid>".MAILHEADER_EOL;
+            $mime .= $this->wrappedHeaderLine('Content-Type', $media['mime'].'; id="'.$cid.'"');
+            $mime .= $this->wrappedHeaderLine('Content-Transfer-Encoding', 'base64');
+            $mime .= $this->wrappedHeaderLine('Content-ID',"<$cid>");
             if($media['embed']) {
-                $mime .= 'Content-Disposition: inline; filename='.$media['name'].''.MAILHEADER_EOL;
+                $mime .= $this->wrappedHeaderLine('Content-Disposition', 'inline; filename='.$media['name']);
             } else {
-                $mime .= 'Content-Disposition: attachment; filename='.$media['name'].''.MAILHEADER_EOL;
+                $mime .= $this->wrappedHeaderLine('Content-Disposition', 'attachment; filename='.$media['name']);
             }
             $mime .= MAILHEADER_EOL; //end of headers
             $mime .= chunk_split(base64_encode($media['data']), 74, MAILHEADER_EOL);
@@ -556,10 +555,17 @@ class Mailer {
             }
         }
 
-        // wrap headers
-        foreach($this->headers as $key => $val) {
-            $this->headers[$key] = wordwrap($val, 78, MAILHEADER_EOL.'  ');
-        }
+    }
+
+    /**
+     * Returns a complete, EOL terminated header line, wraps it if necessary
+     *
+     * @param $key
+     * @param $val
+     * @return string
+     */
+    protected function wrappedHeaderLine($key, $val){
+        return wordwrap("$key: $val", 78, MAILHEADER_EOL.'  ').MAILHEADER_EOL;
     }
 
     /**
@@ -571,7 +577,7 @@ class Mailer {
         $headers = '';
         foreach($this->headers as $key => $val) {
             if ($val === '') continue;
-            $headers .= "$key: $val".MAILHEADER_EOL;
+            $headers .= $this->wrappedHeaderLine($key, $val);
         }
         return $headers;
     }