text: /*! firebase-admin v5.2.1 */
  "use strict";
  /*!
   * Copyright 2017 Google Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  Object.defineProperty(exports, "__esModule", { value: true });
  var error_1 = require("../utils/error");
  var api_request_1 = require("../utils/api-request");
  var error_2 = require("../utils/error");
  var validator = require("../utils/validator");
  // FCM backend constants
  var FIREBASE_MESSAGING_PORT = 443;
  var FIREBASE_MESSAGING_TIMEOUT = 10000;
  var FIREBASE_MESSAGING_HTTP_METHOD = 'POST';
  var FIREBASE_MESSAGING_HEADERS = {
      'Content-Type': 'application/json',
      'Sdk-Version': 'Node/Admin/5.2.1',
      access_token_auth: 'true',
  };
  /**
   * Class that provides a mechanism to send requests to the Firebase Cloud Messaging backend.
   */
  var FirebaseMessagingRequestHandler = (function () {
      /**
       * @param {FirebaseApp} app The app used to fetch access tokens to sign API requests.
       * @constructor
       */
      function FirebaseMessagingRequestHandler(app) {
          this.signedApiRequestHandler = new api_request_1.SignedApiRequestHandler(app);
      }
      /**
       * @param {Object} response The response to check for errors.
       * @return {string|null} The error code if present; null otherwise.
       */
      FirebaseMessagingRequestHandler.getErrorCode = function (response) {
          if (validator.isNonNullObject(response) && 'error' in response) {
              if (typeof response.error === 'string') {
                  return response.error;
              }
              else {
                  return response.error.message;
              }
          }
          return null;
      };
      /**
       * Invokes the request handler with the provided request data.
       *
       * @param {string} host The host to which to send the request.
       * @param {string} path The path to which to send the request.
       * @param {Object} requestData The request data.
       * @return {Promise<Object>} A promise that resolves with the response.
       */
      FirebaseMessagingRequestHandler.prototype.invokeRequestHandler = function (host, path, requestData) {
          return this.signedApiRequestHandler.sendRequest(host, FIREBASE_MESSAGING_PORT, path, FIREBASE_MESSAGING_HTTP_METHOD, requestData, FIREBASE_MESSAGING_HEADERS, FIREBASE_MESSAGING_TIMEOUT).then(function (response) {
              // Send non-JSON responses to the catch() below where they will be treated as errors.
              if (typeof response === 'string') {
                  return Promise.reject({
                      error: response,
                      statusCode: 200,
                  });
              }
              // Check for backend errors in the response.
              var errorCode = FirebaseMessagingRequestHandler.getErrorCode(response);
              if (errorCode) {
                  return Promise.reject({
                      error: response,
                      statusCode: 200,
                  });
              }
              // Return entire response.
              return response;
          })
              .catch(function (response) {
              // Re-throw the error if it already has the proper format.
              if (response instanceof error_1.FirebaseError) {
                  throw response;
              }
              else if (response.error instanceof error_1.FirebaseError) {
                  throw response.error;
              }
              // Add special handling for non-JSON responses.
              if (typeof response.error === 'string') {
                  var error = void 0;
                  switch (response.statusCode) {
                      case 400:
                          error = error_2.MessagingClientErrorCode.INVALID_ARGUMENT;
                          break;
                      case 401:
                      case 403:
                          error = error_2.MessagingClientErrorCode.AUTHENTICATION_ERROR;
                          break;
                      case 500:
                          error = error_2.MessagingClientErrorCode.INTERNAL_ERROR;
                          break;
                      case 503:
                          error = error_2.MessagingClientErrorCode.SERVER_UNAVAILABLE;
                          break;
                      default:
                          // Treat non-JSON responses with unexpected status codes as unknown errors.
                          error = error_2.MessagingClientErrorCode.UNKNOWN_ERROR;
                  }
                  throw new error_2.FirebaseMessagingError({
                      code: error.code,
                      message: error.message + " Raw server response: \"" + response.error + "\". Status code: " +
                          (response.statusCode + "."),
                  });
              }
              // For JSON responses, map the server response to a client-side error.
              var errorCode = FirebaseMessagingRequestHandler.getErrorCode(response.error);
              throw error_2.FirebaseMessagingError.fromServerError(errorCode, /* message */ undefined, response.error);
          });
      };
      return FirebaseMessagingRequestHandler;
  }());
  exports.FirebaseMessagingRequestHandler = FirebaseMessagingRequestHandler;
  