Improved file validation and error handling.

* Removed surpress warnings for 'getimagesize' and 'exif_read_data'
* added check whether file/stream exists and is an image
* added check whether exif data isset
* added error messages
* updated and added tests for new error handling
* added test ressource for xmp exif which can not be read by 'exif_read_data'

Author: Christof Bachmann

lib/ImageResize.php

@@ -39,6 +39,8 @@ class ImageResize
 
     protected $source_w;
     protected $source_h;
+    
+    protected $source_info;
 
     /**
      * Create instance from a strng
@@ -49,6 +51,9 @@ class ImageResize
      */
     public static function createFromString($image_data)
     {
+		if(empty($image_data) || $image_data === null) {
+			throw new ImageResizeException('image_data must not be empty');
+		}
         $resize = new self('data://application/octet-stream;base64,' . base64_encode($image_data));
         return $resize;
     }
@@ -62,7 +67,17 @@ public static function createFromString($image_data)
      */
     public function __construct($filename)
     {
-        $image_info = @getimagesize($filename);
+
+        if($filename === null || empty($filename) || (substr($filename,0,7) !== 'data://' && !is_file($filename))) {
+			throw new ImageResizeException('File does not exist');
+		}	
+		
+		$finfo = finfo_open(FILEINFO_MIME_TYPE);
+		if(strstr(finfo_file($finfo, $filename),'image') === false) {
+			throw new ImageResizeException('Unsupported file type');
+		}
+		
+        $image_info = getimagesize($filename,$this->source_info);
 
         if (!$image_info) {
             throw new ImageResizeException('Could not read file');
@@ -107,12 +122,12 @@ public function __construct($filename)
     // http://stackoverflow.com/a/28819866
     public function imageCreateJpegfromExif($filename){
       $img = imagecreatefromjpeg($filename);
-
-      if (!function_exists('exif_read_data')) {
+      
+      if (!function_exists('exif_read_data') || !isset($this->source_info['APP1'])  || strpos ($this->source_info['APP1'], 'Exif') !== 0) {
           return $img;
       }
-
-      $exif = @exif_read_data($filename);
+     
+      $exif = exif_read_data($filename);
 
       if (!$exif || !isset($exif['Orientation'])){
         return $img;

test/Test.php

@@ -43,6 +43,15 @@ public function testLoadJpg()
         $this->assertEquals(IMAGETYPE_JPEG, $resize->source_type);
         $this->assertInstanceOf('\Eventviva\ImageResize', $resize);
     }
+    
+    public function testLoadIgnoreXmpExifJpg()
+    {
+        $image = __DIR__.'/ressources/test_xmp.jpg';
+        $resize = new ImageResize($image);
+
+        $this->assertEquals(IMAGETYPE_JPEG, $resize->source_type);
+        $this->assertInstanceOf('\Eventviva\ImageResize', $resize);
+    }
 
     public function testLoadPng()
     {
@@ -67,7 +76,7 @@ public function testLoadString()
 
     /**
      * @expectedException \Eventviva\ImageResizeException
-     * @expectedExceptionMessage Could not read file
+     * @expectedExceptionMessage File does not exist
      */
     public function testLoadNoFile()
     {
@@ -76,7 +85,7 @@ public function testLoadNoFile()
 
     /**
      * @expectedException \Eventviva\ImageResizeException
-     * @expectedExceptionMessage Could not read file
+     * @expectedExceptionMessage Unsupported file type
      */
     public function testLoadUnsupportedFile()
     {
@@ -85,7 +94,7 @@ public function testLoadUnsupportedFile()
 
     /**
      * @expectedException \Eventviva\ImageResizeException
-     * @expectedExceptionMessage Could not read file
+     * @expectedExceptionMessage image_data must not be empty
      */
     public function testLoadUnsupportedFileString()
     {