CC-2560: Make sure new watched dirs do not contain existing

watched dirs (and stor dir) and vice-versa.

-fixed

airtime_mvc/application/models/MusicDir.php

@@ -1,5 +1,7 @@
 <?php
 
+class NestedDirectoryException extends Exception { }
+
 class MusicDir {
 
     /**
@@ -58,6 +60,58 @@ class MusicDir {
 
         RabbitMq::PushSchedule();
     }
+    
+    /**
+     * Checks if p_dir1 is the ancestor of p_dir2. Returns
+     * true if it is the ancestor, false otherwise. Note that
+     * /home/user is considered the ancestor of /home/user
+     *
+     * @param string $p_dir1
+     *      The potential ancestor directory.
+     * @param string $p_dir2
+     *      The potential descendent directory.
+     * @return boolean
+     *      Returns true if it is the ancestor, false otherwise.
+     */
+    private static function isAncestorDir($p_dir1, $p_dir2){
+        if (strlen($p_dir1) > strlen($p_dir2)){
+            return false;
+        }
+    
+        return substr($p_dir2, 0, strlen($p_dir1)) == $p_dir1;
+    }
+
+    /**
+     * Checks whether the path provided is a valid path. A valid path
+     * is defined as not being nested within an existing watched directory,
+     * or vice-versa. Throws a NestedDirectoryException if invalid.
+     * 
+     * @param string $p_path
+     *      The path we want to validate
+     * @return void
+     */    
+    public static function isPathValid($p_path){
+        $dirs = self::getWatchedDirs();
+        $dirs[] = self::getStorDir();
+        
+        foreach ($dirs as $dirObj){
+            $dir = $dirObj->getDirectory();
+            $diff = strlen($dir) - strlen($p_path);
+            if ($diff == 0){
+                if ($dir == $p_path){
+                    throw new NestedDirectoryException("'$p_path' is already watched.");
+                }
+            } else if ($diff > 0){
+                if (self::isAncestorDir($p_path, $dir)){
+                    throw new NestedDirectoryException("'$p_path' contains nested watched directory: '$dir'");
+                }
+            } else { /* diff < 0*/
+                if (self::isAncestorDir($dir, $p_path)){
+                    throw new NestedDirectoryException("'$p_path' is nested within existing watched directory: '$dir'");
+                }                
+            }
+        }
+    }
 
     public static function addDir($p_path, $p_type)
     {
@@ -67,13 +121,20 @@ class MusicDir {
         $dir = new CcMusicDirs();
         $dir->setType($p_type);
         $p_path = realpath($p_path)."/";
-        $temp = $dir->setDirectory($p_path);
-        try{
+        
+
+        try {
+            /* isPathValid() checks if path is a substring or a superstring of an 
+             * existing dir and if not, throws NestedDirectoryException */
+            self::isPathValid($p_path);
+            $dir->setDirectory($p_path);
+
             $dir->save();
             return array("code"=>0);
-        }
-        catch(Exception $e){
-            //echo $e->getMessage();
+        } catch (NestedDirectoryException $nde){
+            $msg = $nde->getMessage();
+            return array("code"=>1, "error"=>"$msg");
+        } catch(Exception $e){
             return array("code"=>1, "error"=>"'$p_path' is already set as the current storage dir or in the watched folders list");
         }
 

python_apps/media-monitor/MediaMonitor.py

@@ -30,6 +30,8 @@ except Exception, e:
 
 logger = logging.getLogger()
 
+logger.info("\n\n*** Media Monitor bootup ***\n\n")
+
 try:
     config = AirtimeMediaConfig(logger)
     api_client = api_client.api_client_factory(config.cfg)