Update the method where the auth is checked

Author: ggdiez

Owncloud iOs Client/Login/Login/LoginViewController.m

@@ -1989,23 +1989,32 @@ - (void) checkIfServerAutentificationIsNormalFromURL {
          });
     } failureRequest:^(NSHTTPURLResponse *response, NSError *error, NSString *redirectedServer) {
 
-        BOOL isInvalid = NO;
+        BOOL isInvalid = YES;
+        
+        NSString *authenticationHeader = @"Www-Authenticate";
+        NSString *outhAuthentication = @"bearer";
+        NSString *basicAuthentication = @"basic";
 
         if (!k_is_sso_active) {
-            //Get header related with autentication type
-            NSString *autenticationType = [[response allHeaderFields] valueForKey:@"Www-Authenticate"];
-            
-            if ((autenticationType) && ([autenticationType hasPrefix:@"Bearer"])) {
+            if (response.statusCode == kOCErrorServerUnauthorized) {
+                //Get header related with autentication type
+                NSString *autenticationType = [[response allHeaderFields] valueForKey:authenticationHeader];
+
+                if ((autenticationType) && ([autenticationType.lowercaseString hasPrefix:outhAuthentication])) {
                     //Autentication type oauth
                     if (k_is_oauth_active) {
                         //Check if is activate oauth
                         isInvalid = NO;
                     } else {
                         isInvalid = YES;
                     }
-            } else {
-                    //Unknown autentication type
+                } else if ((autenticationType) && ([autenticationType.lowercaseString hasPrefix:basicAuthentication])) {
                     isInvalid = NO;
+                } else {
+                    //For the moment we have to mantain this value as valid because when we work with
+                    //some Redirected Server our library lost the Wwww-Authenticate header
+                    isInvalid = NO;
+                }
             }
 
         } else {
@@ -2015,6 +2024,7 @@ - (void) checkIfServerAutentificationIsNormalFromURL {
             isLoginButtonEnabled = YES;
         }
 
+        
         //Update the interface depend of if isInvalid or not
         if (isInvalid) {
             hasInvalidAuth = YES;