Consider attribute usage for validation filtering

[mark-pro]

Consider using or merging Genesis.MinimalApis.Validation with Genesis.MinimalApis so that Attributes might be used to provide FluentValidation filtering on parameters.

[mark-pro]

The idea presented would all for the use of an attribute to be used to indicate that the function should be validated with a FluentValidation.IValidator<T>.

Attribute could be named:

• ValidationFilterAttribute<TypeToFilter>
• ValidateAttribute<TypeToFilter>

record Echo(string Message);

[Validate<Echo>]
[MapGet("api/echo")]
string echo([AsParameters] Echo e) => e.Message;

[mark-pro]

Final design for attribute usage; both are now applicable.

record Echo(string Message);

[ValidateParam(typeof(Message))]
[HttpGet("api/echo")]
string echo([AsParameters] Eche e) => e.Message

record Echo(string Message);

[HttpGet("api/echo")]
string echo([Validate, AsParameters] Eche e) => e.Message