Annotations for validations

Hello everyone!

Recently faced the need for validation and would like to be able to embed annotations in your code-generating library. Actually, an idea for development

For example: proto:

message Test {
    // Validated:min=4,regexp=[a-d_1-5]+,max=145
    string field1 = 1;
}

kotlin:

data class Test (
    @field:Size(min=4, max=145)
    @field:Pattern(regexp="[a-d_1-5]+")
    val field1: String?
) {
....
}

[garyp]

Hi @kubitre. We have the exact same need for validation in our REST API backend and are currently working on this. This will probably be available in the 0.9.0 release.

It’ll be implemented using protobuf custom options (see https://github.com/streem/pbandk/issues/65). You can see an example of using custom options for validation in https://github.com/envoyproxy/protoc-gen-validate. That tool doesn’t support Kotlin or pbandk, but it should give you an idea for how the validation rules could be implemented once #65 is done.

[garyp]

Closing this issue since the initial support for annotations has been implemented. Please open a new issue with additional details if what’s implemented does not fully address your needs.