# All files / functions get-token.ts

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     /**
     * @license
     * Copyright 2019 Google LLC
     *
     * 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.
     */

    import { getInstallationEntry } from '../helpers/get-installation-entry';
    import { refreshAuthToken } from '../helpers/refresh-auth-token';
    import { AppConfig } from '../interfaces/app-config';
    import { FirebaseDependencies } from '../interfaces/firebase-dependencies';

    export async function getToken(
      dependencies: FirebaseDependencies,
      forceRefresh = false
    ): Promise<string> {
      await completeInstallationRegistration(dependencies.appConfig);

      // At this point we either have a Registered Installation in the DB, or we've
      // already thrown an error.
      const authToken = await refreshAuthToken(dependencies, forceRefresh);
      return authToken.token;
    }

    async function completeInstallationRegistration(
      appConfig: AppConfig
    ): Promise<void> {
      const { registrationPromise } = await getInstallationEntry(appConfig);

      if (registrationPromise) {
        // A createInstallation request is in progress. Wait until it finishes.
        await registrationPromise;
      }
    }