HotChoco.ArgumentValidator 1.0.0

Adds support for validating input arguments in HotChocolate

Generally we use attributes from System.Annotations for validating our input models in controllers.

As HotChocolate don't validate input arguments , After installing this pacakage, By just adding 2 lines of code in your Startup.cs file. You will be adding support for validation to all input models in your Queries/Mutations.

Steps for configuring validator

Step 1

Go to StartUp.cs file and inside ConfigureServices make the following changes.

Step 2

Keep this code to validate all inputs of GraphQL Query/Mutation.

ValidatorSettings.ValdiateAllInputs = true;

Step 3

Add argument valdiator to services by referring below code

services
  .AddGraphQLServer()
  .AddArgumentValidator();

Additional Configuration

If you don't want to valdiate all inputs then you can skip step 2 and follow the optional step i.e

Just add Validatable attribute to the class u defined for input.

Ex:

    [Validatable]
    public class AddUserInput
    {
        [Required, MinLength(4, ErrorMessage = "Username must be atleast 4 characters.")]
        public string UserName { get; set; }

        [Required, RegularExpression(@"^[^@\s]+@[^@\s]+\.[^@\s]+$", ErrorMessage = "Email Id format is invalid")]
        public string Email { get; set; }

        [Required, RegularExpression(@"^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#?!@$%^&*-]).{8,}$", ErrorMessage = "Password needs to be more strong.")]
        public string Password { get; set; }
    }

When user given wrong values to input, this is how the response from GraphQL Server will looks like

{
  "errors": [
    {
      "message": "Username must be at least 4 characters."
    },
    {
      "message": "Password needs to be more strong."
    }
  ]
}