Enhanced upload file type detection. If given an original filename, we'll attempt to detect type from the extension if we were unable to make a definitive match from content. Generic octet-stream, zip, and MS Office type are explicitly singled out for re-checks, which fixes OpenOffice and MS Office documents to come up with the proper types when misdetected.

File extensions can also be added to the upload type whitelist; they'll be normalized to types for the actual comparison, so only known extensions will work.

lib/mediafile.php

@@ -180,7 +180,8 @@ class MediaFile
             return;
         }
 
-        $mimetype = MediaFile::getUploadedFileType($_FILES[$param]['tmp_name']);
+        $mimetype = MediaFile::getUploadedFileType($_FILES[$param]['tmp_name'],
+                                                   $_FILES[$param]['name']);
 
         $filename = null;
 
@@ -241,19 +242,41 @@ class MediaFile
         return new MediaFile($user, $filename, $mimetype);
     }
 
-    static function getUploadedFileType($f) {
+    /**
+     * Attempt to identify the content type of a given file.
+     * 
+     * @param mixed $f file handle resource, or filesystem path as string
+     * @param string $originalFilename (optional) for extension-based detection
+     * @return string
+     * 
+     * @fixme is this an internal or public method? It's called from GetFileAction
+     * @fixme this seems to tie a front-end error message in, kinda confusing
+     * @fixme this looks like it could return a PEAR_Error in some cases, if
+     *        type can't be identified and $config['attachments']['supported'] is true
+     * 
+     * @throws ClientException if type is known, but not supported for local uploads
+     */
+    static function getUploadedFileType($f, $originalFilename=false) {
         require_once 'MIME/Type.php';
+        require_once 'MIME/Type/Extension.php';
+        $mte = new MIME_Type_Extension();
 
         $cmd = &PEAR::getStaticProperty('MIME_Type', 'fileCmd');
         $cmd = common_config('attachments', 'filecommand');
 
         $filetype = null;
 
+        // If we couldn't get a clear type from the file extension,
+        // we'll go ahead and try checking the content. Content checks
+        // are unambiguous for most image files, but nearly useless
+        // for office document formats.
+
         if (is_string($f)) {
 
             // assuming a filename
 
             $filetype = MIME_Type::autoDetect($f);
+
         } else {
 
             // assuming a filehandle
@@ -262,7 +285,32 @@ class MediaFile
             $filetype = MIME_Type::autoDetect($stream['uri']);
         }
 
-        if (common_config('attachments', 'supported') === true || in_array($filetype, common_config('attachments', 'supported'))) {
+        // The content-based sources for MIME_Type::autoDetect()
+        // are wildly unreliable for office-type documents. If we've
+        // gotten an unclear reponse back or just couldn't identify it,
+        // we'll try detecting a type from its extension...
+        $unclearTypes = array('application/octet-stream',
+                              'application/vnd.ms-office',
+                              'application/zip');
+
+        if ($originalFilename && (!$filetype || in_array($filetype, $unclearTypes))) {
+            $type = $mte->getMIMEType($originalFilename);
+            if (is_string($type)) {
+                $filetype = $type;
+            }
+        }
+
+        $supported = common_config('attachments', 'supported');
+        if (is_array($supported)) {
+            // Normalize extensions to mime types
+            foreach ($supported as $i => $entry) {
+                if (strpos($entry, '/') === false) {
+                    common_log(LOG_INFO, "sample.$entry");
+                    $supported[$i] = $mte->getMIMEType("sample.$entry");
+                }
+            }
+        }
+        if ($supported === true || in_array($filetype, $supported)) {
             return $filetype;
         }
         $media = MIME_Type::getMedia($filetype);

tests/MediaFileTest.php

@@ -34,43 +34,62 @@ class MediaFileTest extends PHPUnit_Framework_TestCase
         if (!file_exists($filename)) {
             throw new Exception("WTF? $filename test file missing");
         }
-        $this->assertEquals($expectedType, MediaFile::getUploadedFileType($filename));
+
+        $type = MediaFile::getUploadedFileType($filename, basename($filename));
+        $this->assertEquals($expectedType, $type);
+    }
+
+    /**
+     * @dataProvider fileTypeCases
+     *
+     */
+    public function testUploadedFileType($filename, $expectedType)
+    {
+        if (!file_exists($filename)) {
+            throw new Exception("WTF? $filename test file missing");
+        }
+        $tmp = tmpfile();
+        fwrite($tmp, file_get_contents($filename));
+
+        $type = MediaFile::getUploadedFileType($tmp, basename($filename));
+        $this->assertEquals($expectedType, $type);
     }
 
     static public function fileTypeCases()
     {
         $base = dirname(__FILE__);
         $dir = "$base/sample-uploads";
-        return array(
-            array("$dir/office.pdf", "application/pdf"),
+        $files = array(
+            "image.png" => "image/png",
+            "image.gif" => "image/gif",
+            "image.jpg" => "image/jpeg",
+            "image.jpeg" => "image/jpeg",
         
-            array("$dir/wordproc.odt", "application/vnd.oasis.opendocument.text"),
-            array("$dir/wordproc.ott", "application/vnd.oasis.opendocument.text-template"),
-            array("$dir/wordproc.doc", "application/msword"),
-            array("$dir/wordproc.docx",
-                "application/vnd.openxmlformats-officedocument.wordprocessingml.document"),
-            array("$dir/wordproc.rtf", "text/rtf"),
+            "office.pdf" => "application/pdf",
             
-            array("$dir/spreadsheet.ods",
-                "application/vnd.oasis.opendocument.spreadsheet"),
-            array("$dir/spreadsheet.ots",
-                "application/vnd.oasis.opendocument.spreadsheet-template"),
-            array("$dir/spreadsheet.xls", "application/vnd.ms-excel"),
-            array("$dir/spreadsheet.xlt", "application/vnd.ms-excel"),
-            array("$dir/spreadsheet.xlsx",
-                "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"),
+            "wordproc.odt" => "application/vnd.oasis.opendocument.text",
+            "wordproc.ott" => "application/vnd.oasis.opendocument.text-template",
+            "wordproc.doc" => "application/msword",
+            "wordproc.docx" => "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+            "wordproc.rtf" => "text/rtf",
             
-            array("$dir/presentation.odp",
-                "application/vnd.oasis-opendocument.presentation"),
-            array("$dir/presentation.otp",
-                "application/vnd.oasis-opendocument.presentation-template"),
-            array("$dir/presentation.ppt",
-                "application/vnd.ms-powerpoint"),
-            array("$dir/presentation.pot",
-                "application/vnd.ms-powerpoint"),
-            array("$dir/presentation.pptx",
-                "application/vnd.openxmlformats-officedocument.presentationml.presentation"),
+            "spreadsheet.ods" => "application/vnd.oasis.opendocument.spreadsheet",
+            "spreadsheet.ots" => "application/vnd.oasis.opendocument.spreadsheet-template",
+            "spreadsheet.xls" => "application/vnd.ms-excel",
+            "spreadsheet.xlt" => "application/vnd.ms-excel",
+            "spreadsheet.xlsx" => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+            
+            "presentation.odp" => "application/vnd.oasis.opendocument.presentation",
+            "presentation.otp" => "application/vnd.oasis.opendocument.presentation-template",
+            "presentation.ppt" => "application/vnd.ms-powerpoint",
+            "presentation.pptx" => "application/vnd.openxmlformats-officedocument.presentationml.presentation",
         );
+
+        $dataset = array();
+        foreach ($files as $file => $type) {
+            $dataset[] = array("$dir/$file", $type);
+        }
+        return $dataset;
     }
 
 }