// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef TOPAZ_AUTH_PROVIDERS_OAUTH_OAUTH_REQUEST_BUILDER_H_
#define TOPAZ_AUTH_PROVIDERS_OAUTH_OAUTH_REQUEST_BUILDER_H_

#include <fuchsia/net/oldhttp/cpp/fidl.h>

namespace auth_providers {
namespace oauth {

// Request builder for an OAuth Https Request. This builder converts the
// oauth endpoint request to an URI in the format as described by the OAuth
// protocol specification:
//     - https://tools.ietf.org/html/rfc6749
class OAuthRequestBuilder {
 public:
  OAuthRequestBuilder(const std::string& url, const std::string& method);

  ~OAuthRequestBuilder();

  // Sets the bearer token in the http authorization header field.
  OAuthRequestBuilder& SetAuthorizationHeader(const std::string& token);

  // Sets the HTTP request body to the url encoded format of |body|. This
  // method also adds the relevant http request headers for content-type and
  // content-length fields for posting "application/x-www-form-urlencoded" MIME
  // datatypes.
  OAuthRequestBuilder& SetUrlEncodedBody(const std::string& body);

  // Sets the HTTP request body to the json encoded string |body|. This method
  // also adds the relevant http headers for accept, content-type and
  // content-length fields for posting JSON data.
  OAuthRequestBuilder& SetJsonBody(const std::string& body);

  // Url encodes the query params which are appended to the url string while
  // building the request.
  OAuthRequestBuilder& SetQueryParams(
      std::map<std::string, std::string> query_params);

  // Returns an HTTP |URLRequest| handle for the OAuth endpoint.
  ::fuchsia::net::oldhttp::URLRequest Build() const;

 private:
  // Sets the HTTP request body field to |body|.
  OAuthRequestBuilder& SetRequestBody(const std::string& body);

  const std::string url_;
  const std::string method_;
  std::string query_string_;
  std::string request_body_;
  std::map<std::string, std::string> http_headers_;
};

}  // namespace oauth
}  // namespace auth_providers

#endif  // TOPAZ_AUTH_PROVIDERS_OAUTH_OAUTH_REQUEST_BUILDER_H_