we need to be able to set the mimetype manually

lib/private/preview.php

@@ -40,6 +40,7 @@ class Preview {
 	private $maxX;
 	private $maxY;
 	private $scalingup;
+	private $mimetype;
 
 	//preview images object
 	/**
@@ -64,6 +65,13 @@ class Preview {
 	 *					path to thumbnail if thumbnail exists
 	*/
 	public function __construct($user='', $root='/', $file='', $maxX=1, $maxY=1, $scalingUp=true) {
+		//init fileviews
+		if($user === ''){
+			$user = \OC_User::getUser();
+		}
+		$this->fileView = new \OC\Files\View('/' . $user . '/' . $root);
+		$this->userView = new \OC\Files\View('/' . $user);
+
 		//set config
 		$this->configMaxX = \OC_Config::getValue('preview_max_x', null);
 		$this->configMaxY = \OC_Config::getValue('preview_max_y', null);
@@ -75,13 +83,6 @@ class Preview {
 		$this->setMaxY($maxY);
 		$this->setScalingUp($scalingUp);
 
-		//init fileviews
-		if($user === ''){
-			$user = \OC_User::getUser();
-		}
-		$this->fileView = new \OC\Files\View('/' . $user . '/' . $root);
-		$this->userView = new \OC\Files\View('/' . $user);
-		
 		$this->preview = null;
 
 		//check if there are preview backends
@@ -166,9 +167,16 @@ class Preview {
 	*/
 	public function setFile($file) {
 		$this->file = $file;
+		if ($file !== '') {
+			$this->mimetype = $this->fileView->getMimeType($this->file);
+		}
 		return $this;
 	}
 
+	public function setMimetype($mimetype) {
+		$this->mimetype = $mimetype;
+	}
+
 	/**
 	 * @brief set the the max width of the preview
 	 * @param int $maxX
@@ -386,11 +394,10 @@ class Preview {
 		}
 
 		if(is_null($this->preview)) {
-			$mimetype = $this->fileView->getMimeType($file);
 			$preview = null;
 
 			foreach(self::$providers as $supportedMimetype => $provider) {
-				if(!preg_match($supportedMimetype, $mimetype)) {
+				if(!preg_match($supportedMimetype, $this->mimetype)) {
 					continue;
 				}