[PS 920] Fix selfhosted url validations (#1967)

* PS-920 - Added feedback to user when saving bad formed URLs
* Added feedback to user when trying to perform login with bad formed URL

* PS-920 - Refactor to use AsyncCommand
*(missing file from previous commit)

* PS-920 - Fixed whitespace formatting

* PS-920 - Removed unused method

* PS-920 - Fixed validation
* Added comment for hard coded string

* PS-920 - Removed unused properties
* Fixed url validations
* Refactored method to local function

* PS-920 - Added exception handling and logging
* Added generic error message string to AppResources

src/Core/Services/ApiService.cs

@@ -589,7 +589,19 @@ namespace Bit.Core.Services
             {
                 requestMessage.Version = new Version(1, 0);
                 requestMessage.Method = method;
+
+                if (!Uri.IsWellFormedUriString(ApiBaseUrl, UriKind.Absolute))
+                {
+                    throw new ApiException(new ErrorResponse
+                    {
+                        StatusCode = HttpStatusCode.BadGateway,
+                        //Note: This message is hardcoded until AppResources.resx gets moved into Core.csproj
+                        Message = "One or more URLs saved in the Settings are incorrect. Please revise it and try to log in again."
+                    });
+                }
+
                 requestMessage.RequestUri = new Uri(string.Concat(ApiBaseUrl, path));
+
                 if (body != null)
                 {
                     var bodyType = body.GetType();