ScalaPB code generation of case class and validator

CreateAccountRequest.proto

syntax = "proto2";

package teads.api;

import "validate/validate.proto";

message CreateAccountRequest {
  required string first_name = 1 [(validate.rules).string.max_len = 255];
  required string last_name = 2 [(validate.rules).string.max_len = 255];
  required string email = 3 [(validate.rules).string.email = true];
  optional string website = 4 [(validate.rules).string.uri = true];
  repeated string roles = 5 [(validate.rules).repeated = {min_items: 1, unique: true}];
}

CreateAccountRequest.scala

package teads.api

final case class CreateAccountRequest(
  firstName: String,
  lastName: String,
  email: String,
  website: Option[String] = None,
  roles: Seq[String] = Seq.empty
) extends scalapb.GeneratedMessage {
 ...
}

CreateAccountRequestValidator.scala

package teads.api

import scalapb.validate.{Result, Validator}
import scalapb.validate.RepeatedValidation._
import io.envoyproxy.pgv.StringValidation._

object CreateAccountRequestValidator extends Validator[CreateAccountRequest] {
  def validate(input: CreateAccountRequest): Result =
    Result.run(maxLength("CreateAccountRequest.first_name", input.firstName, 255)) &&
      Result.run(maxLength("CreateAccountRequest.last_name", input.lastName, 255)) &&
      Result.run(email("CreateAccountRequest.email", input.email)) &&
      Result.optional(input.website) { _value =>
        Result.run(uri("CreateAccountRequest.website", _value))
      } &&
      minItems("CreateAccountRequest.roles", input.roles.size, 1) &&
      unique("CreateAccountRequest.roles", input.roles.iterator.toSeq)
}