LDAP changes to for AD flexibility (#227)

* custom filter for Active Directory support
* added custom port number support

* Removed the redundant line

auth.php

@@ -115,20 +115,30 @@ protected function _sql($id,$pw,$realm) {
 	*	@param $pw string
 	**/
 	protected function _ldap($id,$pw) {
-		$dc=@ldap_connect($this->args['dc']);
-		if ($dc &&
-			ldap_set_option($dc,LDAP_OPT_PROTOCOL_VERSION,3) &&
-			ldap_set_option($dc,LDAP_OPT_REFERRALS,0) &&
-			ldap_bind($dc,$this->args['rdn'],$this->args['pw']) &&
-			($result=ldap_search($dc,$this->args['base_dn'],
-				$this->args['uid'].'='.$id)) &&
-			ldap_count_entries($dc,$result) &&
-			($info=ldap_get_entries($dc,$result)) &&
-			@ldap_bind($dc,$info[0]['dn'],$pw) &&
-			@ldap_close($dc)) {
-			return $info[0][$this->args['uid']][0]==$id;
-		}
-		user_error(self::E_LDAP,E_USER_ERROR);
+	  $port=intval($this->args['port']?:389)
+	  $filter=$this->args['filter']=$this->args['filter']?:"uid=".$id;
+	  $this->args['attr']=$this->args['attr']?:["uid"];
+	  array_walk($this->args['attr'],
+	    function($attr)use(&$filter,$id) {
+	      $filter=str_ireplace($attr."=*",$attr."=".$id,$filter);});
+	  $dc=@ldap_connect($this->args['dc'],$port);
+	  if ($dc &&
+	    ldap_set_option($dc,LDAP_OPT_PROTOCOL_VERSION,3) &&
+	    ldap_set_option($dc,LDAP_OPT_REFERRALS,0) &&
+	    ldap_bind($dc,$this->args['rdn'],$this->args['pw']) &&
+	    ($result=ldap_search($dc,$this->args['base_dn'],
+	     $filter,$this->args['attr'])) &&
+	    ldap_count_entries($dc,$result) &&
+	    ($info=ldap_get_entries($dc,$result)) &&
+	    $info['count']==1 &&
+	    @ldap_bind($dc,$info[0]['dn'],$pw) &&
+	    @ldap_close($dc)) {
+	      return in_array($id,(array_map(function($value){
+	         return $value[0];},
+	         array_intersect_key($info[0],
+	         array_flip($this->args['attr'])))),TRUE);
+	  }
+	  user_error(self::E_LDAP,E_USER_ERROR);
 	}
 
 	/**