Command can be disabled on mutualized servers

app/Controller/AppController.php

@@ -37,6 +37,7 @@ class AppController extends Controller {
         'Session',
         'DebugKit.Toolbar',
         'Image',
+        'CheckCmd',
         'Paginator',
         'Auth' => array(
             'authenticate' => array(

app/Controller/Component/CheckCmdComponent.php

@@ -0,0 +1,13 @@
+<?php
+
+App::uses('Component', 'Controller');
+
+class CheckCmdComponent extends Component{
+
+	public function is_shell_exec_available($cmd) {
+		if (in_array('shell_exec', explode(',',ini_get('disable_functions')))){
+            return shell_exec($cmd);
+        }
+        return false;
+	}
+}

app/Controller/Component/ImageComponent.php

@@ -4,6 +4,8 @@
 
 class ImageComponent extends Component{
 
+    public $components = array('CheckCmd');
+
     private static $useGD = TRUE;
     private static $jpeg_quality = 90;
     private static $png_quality = 9;
@@ -12,7 +14,13 @@ public function resize($img, $to, $width = 0, $height = 0){
 
         $dimensions = getimagesize($img);
         $ratio		= $dimensions[0] / $dimensions[1];
-        $exif = exif_read_data($img);
+        $extension = substr($img, 0, -strpos($img, '.'));
+        if (in_array($extension,array('jpeg','jpg','gif')) ) {
+            $exif = exif_read_data($img);
+        } else {
+            $exif['Orientation'] = 1;
+        }
+
         $rotation = 0;
 
         if(isset($exif['Orientation'])){
@@ -84,12 +92,12 @@ public function resize($img, $to, $width = 0, $height = 0){
                 imagejpeg($pattern, $to, self::$jpeg_quality);
             }
             return TRUE;
-        }else{
+        }else {
             $cmd = '/usr/bin/convert -resize '.$dimX.'x'.$dimY.' "'.$img.'" "'.$to.'"';
-            shell_exec($cmd);
+            $this->CheckCmd->is_shell_exec_available($cmd);
 
             $cmd = '/usr/bin/convert -gravity Center -quality '.self::$quality.' -crop '.$width.'x'.$height.'+0+0 -page '.$width.'x'.$height.' "'.$to.'" "'.$to.'"';
-            shell_exec($cmd);
+            $this->CheckCmd->is_shell_exec_available($cmd);
         }
         return TRUE;
     }

app/Controller/InstallersController.php

@@ -4,6 +4,7 @@
 App::uses('File', 'Utility');
 App::uses('ConnectionManager', 'Model');
 App::uses('SchemaShell', 'Console/Command');
+App::uses('Component', 'Controller');
 
 /**
  * Class InstallationsController
@@ -16,6 +17,8 @@ class InstallersController extends AppController {
     var $uses = array();
     var $layout = 'installer';
 
+    public $components = array('CheckCmd');
+
     public function beforeFilter() {
         parent::beforeFilter();
         $this->Auth->allow();
@@ -29,7 +32,7 @@ public function beforeFilter() {
     public function index() {
         $this->view = "index";
         $gd = extension_loaded('gd');
-        $libavtools = shell_exec('which avconv') != '';
+        $libavtools = $this->CheckCmd->is_shell_exec_available('which avconv') != '';
         $is_config_writable = is_writable(APP.'Config');
         $is_core_writable = is_writable(APP.'Config'.DS.'core.php');
 

app/Controller/SettingsController.php

@@ -11,6 +11,7 @@
 class SettingsController extends AppController {
 
     public $helpers = array('FileSize');
+    public $components = array('CheckCmd');
 
     /**
      * This function manages the Sonerezh settings panel.
@@ -56,7 +57,7 @@ public function index(){
         }
 
         // Check if avconv shell command is available
-        $cmd = shell_exec("which avconv");
+        $cmd = $this->CheckCmd->is_shell_exec_available('which avconv');
         $avconv = empty($cmd) ? false : true;
 
         if (empty($this->request->data)) {