Vapor 3 helper for validating Google Recaptchas

GoogleCaptcha.swift

import Foundation
import Vapor

struct GoogleCaptcha {
    let client: Client
    let secretKey: String
    private let endpoint = "https://www.google.com/recaptcha/api/siteverify"
    
    func validate(captchaResponse: String) throws -> Future<Bool> {
        let requestData = GoogleCaptchaRequest(secret: secretKey, response: captchaResponse)
        
        return client.post(endpoint, headers: [HTTPHeaderName.contentType.description: MediaType.urlEncodedForm.description], content: requestData).flatMap(to: GoogleCaptchaResponse.self) { response in
            return try response.content.decode(GoogleCaptchaResponse.self)
        }.map(to: Bool.self) { response in
            return response.success ?? false
        }
    }
}

private struct GoogleCaptchaRequest: Content {
    var secret: String
    var response: String
}

private struct GoogleCaptchaResponse: Content {
    var success: Bool?
}

route.swift

private func contactForm(req: Request, contactForm: ContactRequest) throws -> Future<Response> {        
    let client = try req.make(Client.self)

    return try GoogleCaptcha(client: client, secretKey: "MY-CAPTCHA-SECRET")
        .validate(captchaResponse: "MY-CAPTCHA-RESPONSE-FROM-FORM")
        .flatMap(to: Void.self) { success in
            guard success else { throw Abort(.unauthorized) }
            return .done(on: req)
        }.flatMap(to: Response.self) { _ in
            //do something else now that captcha is verified 
    }
}