Is it possible to have schema validation of path parameters in a contract? I have tried ```routes +=...

# http4k

[Mikael Ståldal]

Is it possible to have schema validation of path parameters in a contract? I have tried

routes += "/foo" / Path.regex("[0-9a-fA-F]{64}").of("bar", "Hex encoded value") meta { /* ... */ }

but I can't get it to match anything, and no corresponding schema is included in the generated OpenAPI JSON doc.

[Mikael Ståldal]

Ah, it seems like I need to wrap the regex with () .

[Andrew O'Hara]

Makes sense. I was confused too.

An alternative is to use a values4k class with regex validation. Values4k is a third-party lib, but http4k has built-in support for it. For example:

class UserCode private constructor(value: String) : StringValue(value) {
    companion object : StringValueFactory<UserCode>(::UserCode, "\\d{6}".regex)
}

and then make a lens with Path.value(UserCode).of("user_code")