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com.google.firebase.projectmanagement.FirebaseProjectManagementServiceImpl Maven / Gradle / Ivy

/* Copyright 2018 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.
 */

package com.google.firebase.projectmanagement;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import com.google.api.client.http.HttpRequestFactory;
import com.google.api.client.http.HttpResponseInterceptor;
import com.google.api.client.util.Base64;
import com.google.api.client.util.Key;
import com.google.api.client.util.Sleeper;
import com.google.api.core.ApiAsyncFunction;
import com.google.api.core.ApiFunction;
import com.google.api.core.ApiFuture;
import com.google.api.core.SettableApiFuture;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.firebase.ErrorCode;
import com.google.firebase.FirebaseApp;
import com.google.firebase.ImplFirebaseTrampolines;
import com.google.firebase.IncomingHttpResponse;
import com.google.firebase.internal.ApiClientUtils;
import com.google.firebase.internal.CallableOperation;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

class FirebaseProjectManagementServiceImpl implements AndroidAppService, IosAppService {

  @VisibleForTesting static final String FIREBASE_PROJECT_MANAGEMENT_URL =
      "https://firebase.googleapis.com";
  @VisibleForTesting static final int MAXIMUM_LIST_APPS_PAGE_SIZE = 100;

  private static final int MAXIMUM_POLLING_ATTEMPTS = 7;
  private static final long POLL_BASE_WAIT_TIME_MILLIS = 500L;
  private static final double POLL_EXPONENTIAL_BACKOFF_FACTOR = 1.5;
  private static final String ANDROID_APPS_RESOURCE_NAME = "androidApps";
  private static final String IOS_APPS_RESOURCE_NAME = "iosApps";
  private static final String ANDROID_NAMESPACE_PROPERTY = "package_name";
  private static final String IOS_NAMESPACE_PROPERTY = "bundle_id";

  private final FirebaseApp app;
  private final Sleeper sleeper;
  private final Scheduler scheduler;
  private final HttpHelper httpHelper;

  private final CreateAndroidAppFromAppIdFunction createAndroidAppFromAppIdFunction =
      new CreateAndroidAppFromAppIdFunction();
  private final CreateIosAppFromAppIdFunction createIosAppFromAppIdFunction =
      new CreateIosAppFromAppIdFunction();

  FirebaseProjectManagementServiceImpl(FirebaseApp app) {
    this(
        app,
        Sleeper.DEFAULT,
        new FirebaseAppScheduler(app),
        ApiClientUtils.newAuthorizedRequestFactory(app));
  }

  @VisibleForTesting
  FirebaseProjectManagementServiceImpl(
      FirebaseApp app, Sleeper sleeper, Scheduler scheduler, HttpRequestFactory requestFactory) {
    this.app = checkNotNull(app);
    this.sleeper = checkNotNull(sleeper);
    this.scheduler = checkNotNull(scheduler);
    this.httpHelper = new HttpHelper(app.getOptions().getJsonFactory(), requestFactory);
  }

  @VisibleForTesting
  void setInterceptor(HttpResponseInterceptor interceptor) {
    httpHelper.setInterceptor(interceptor);
  }

  /* getAndroidApp */

  @Override
  public AndroidAppMetadata getAndroidApp(String appId) throws FirebaseProjectManagementException {
    return getAndroidAppOp(appId).call();
  }

  @Override
  public ApiFuture getAndroidAppAsync(String appId) {
    return getAndroidAppOp(appId).callAsync(app);
  }

  private CallableOperation getAndroidAppOp(
      final String appId) {
    return new CallableOperation() {
      @Override
      protected AndroidAppMetadata execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/projects/-/androidApps/%s", FIREBASE_PROJECT_MANAGEMENT_URL, appId);
        AndroidAppResponse parsedResponse = new AndroidAppResponse();
        httpHelper.makeGetRequest(url, parsedResponse, appId, "App ID");
        return new AndroidAppMetadata(
            parsedResponse.name,
            parsedResponse.appId,
            Strings.emptyToNull(parsedResponse.displayName),
            parsedResponse.projectId,
            parsedResponse.packageName);
      }
    };
  }

  /* getIosApp */

  @Override
  public IosAppMetadata getIosApp(String appId) throws FirebaseProjectManagementException {
    return getIosAppOp(appId).call();
  }

  @Override
  public ApiFuture getIosAppAsync(String appId) {
    return getIosAppOp(appId).callAsync(app);
  }

  private CallableOperation getIosAppOp(
      final String appId) {
    return new CallableOperation() {
      @Override
      protected IosAppMetadata execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/projects/-/iosApps/%s", FIREBASE_PROJECT_MANAGEMENT_URL, appId);
        IosAppResponse parsedResponse = new IosAppResponse();
        httpHelper.makeGetRequest(url, parsedResponse, appId, "App ID");
        return new IosAppMetadata(
            parsedResponse.name,
            parsedResponse.appId,
            Strings.emptyToNull(parsedResponse.displayName),
            parsedResponse.projectId,
            parsedResponse.bundleId);
      }
    };
  }

  /* listAndroidApps, listIosApps */

  @Override
  public List listAndroidApps(String projectId)
      throws FirebaseProjectManagementException {
    return listAndroidAppsOp(projectId).call();
  }

  @Override
  public ApiFuture> listAndroidAppsAsync(String projectId) {
    return listAndroidAppsOp(projectId).callAsync(app);
  }

  @Override
  public List listIosApps(String projectId) throws FirebaseProjectManagementException {
    return listIosAppsOp(projectId).call();
  }

  @Override
  public ApiFuture> listIosAppsAsync(String projectId) {
    return listIosAppsOp(projectId).callAsync(app);
  }

  private CallableOperation, FirebaseProjectManagementException> listAndroidAppsOp(
      String projectId) {
    return listAppsOp(projectId, ANDROID_APPS_RESOURCE_NAME, createAndroidAppFromAppIdFunction);
  }

  private CallableOperation, FirebaseProjectManagementException> listIosAppsOp(
      String projectId) {
    return listAppsOp(projectId, IOS_APPS_RESOURCE_NAME, createIosAppFromAppIdFunction);
  }

  private  CallableOperation, FirebaseProjectManagementException> listAppsOp(
      final String projectId,
      final String platformResourceName,
      final CreateAppFromAppIdFunction createAppFromAppIdFunction) {
    return new CallableOperation, FirebaseProjectManagementException>() {
      @Override
      protected List execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/projects/%s/%s?page_size=%d",
            FIREBASE_PROJECT_MANAGEMENT_URL,
            projectId,
            platformResourceName,
            MAXIMUM_LIST_APPS_PAGE_SIZE);
        ImmutableList.Builder builder = ImmutableList.builder();
        ListAppsResponse parsedResponse;
        do {
          parsedResponse = new ListAppsResponse();
          httpHelper.makeGetRequest(url, parsedResponse, projectId, "Project ID");
          if (parsedResponse.apps == null) {
            break;
          }
          for (AppResponse app : parsedResponse.apps) {
            builder.add(createAppFromAppIdFunction.apply(app.appId));
          }
          url = String.format(
              "%s/v1beta1/projects/%s/%s?page_token=%s&page_size=%d",
              FIREBASE_PROJECT_MANAGEMENT_URL,
              projectId,
              platformResourceName,
              parsedResponse.nextPageToken,
              MAXIMUM_LIST_APPS_PAGE_SIZE);
        } while (!Strings.isNullOrEmpty(parsedResponse.nextPageToken));
        return builder.build();
      }
    };
  }

  private static class ListAppsResponse {
    @Key("apps")
    private List apps;

    @Key("nextPageToken")
    private String nextPageToken;
  }

  /* createAndroidApp, createIosApp */

  @Override
  public AndroidApp createAndroidApp(String projectId, String packageName, String displayName)
      throws FirebaseProjectManagementException {
    String operationName = createAndroidAppOp(projectId, packageName, displayName).call();
    String appId = pollOperation(projectId, operationName);
    return new AndroidApp(appId, this);
  }

  @Override
  public ApiFuture createAndroidAppAsync(
      String projectId, String packageName, String displayName) {
    checkArgument(!Strings.isNullOrEmpty(packageName), "package name must not be null or empty");
    return
        ImplFirebaseTrampolines.transform(
            ImplFirebaseTrampolines.transformAsync(
                createAndroidAppOp(projectId, packageName, displayName).callAsync(app),
                new WaitOperationFunction(projectId),
                app),
            createAndroidAppFromAppIdFunction,
            app);
  }

  @Override
  public IosApp createIosApp(String projectId, String bundleId, String displayName)
      throws FirebaseProjectManagementException {
    String operationName = createIosAppOp(projectId, bundleId, displayName).call();
    String appId = pollOperation(projectId, operationName);
    return new IosApp(appId, this);
  }

  @Override
  public ApiFuture createIosAppAsync(
      String projectId, String bundleId, String displayName) {
    checkArgument(!Strings.isNullOrEmpty(bundleId), "bundle ID must not be null or empty");
    return
        ImplFirebaseTrampolines.transform(
            ImplFirebaseTrampolines.transformAsync(
                createIosAppOp(projectId, bundleId, displayName).callAsync(app),
                new WaitOperationFunction(projectId),
                app),
            createIosAppFromAppIdFunction,
            app);
  }

  private CallableOperation createAndroidAppOp(
      String projectId, String namespace, String displayName) {
    return createAppOp(
        projectId, namespace, displayName, ANDROID_NAMESPACE_PROPERTY, ANDROID_APPS_RESOURCE_NAME);
  }

  private CallableOperation createIosAppOp(
      String projectId, String namespace, String displayName) {
    return createAppOp(
        projectId, namespace, displayName, IOS_NAMESPACE_PROPERTY, IOS_APPS_RESOURCE_NAME);
  }

  private CallableOperation createAppOp(
      final String projectId,
      final String namespace,
      final String displayName,
      final String platformNamespaceProperty,
      final String platformResourceName) {
    return new CallableOperation() {
      @Override
      protected String execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/projects/%s/%s",
            FIREBASE_PROJECT_MANAGEMENT_URL,
            projectId,
            platformResourceName);
        ImmutableMap.Builder payloadBuilder =
            ImmutableMap.builder().put(platformNamespaceProperty, namespace);
        if (!Strings.isNullOrEmpty(displayName)) {
          payloadBuilder.put("display_name", displayName);
        }
        OperationResponse operationResponseInstance = new OperationResponse();
        IncomingHttpResponse response = httpHelper.makePostRequest(
            url, payloadBuilder.build(), operationResponseInstance, projectId, "Project ID");
        if (Strings.isNullOrEmpty(operationResponseInstance.name)) {
          String message = buildMessage(
              namespace,
              "Bundle ID",
              "Unable to create App: server returned null operation name.");
          throw new FirebaseProjectManagementException(ErrorCode.INTERNAL, message, response);
        }
        return operationResponseInstance.name;
      }
    };
  }

  private String pollOperation(String projectId, String operationName)
      throws FirebaseProjectManagementException {
    String url = String.format("%s/v1/%s", FIREBASE_PROJECT_MANAGEMENT_URL, operationName);
    for (int currentAttempt = 0; currentAttempt < MAXIMUM_POLLING_ATTEMPTS; currentAttempt++) {
      long delayMillis = (long) (
          POLL_BASE_WAIT_TIME_MILLIS
              * Math.pow(POLL_EXPONENTIAL_BACKOFF_FACTOR, currentAttempt));
      sleepOrThrow(projectId, delayMillis);
      OperationResponse operationResponseInstance = new OperationResponse();
      IncomingHttpResponse response = httpHelper.makeGetRequest(
          url, operationResponseInstance, projectId, "Project ID");
      if (!operationResponseInstance.done) {
        continue;
      }
      // The Long Running Operation API guarantees that when done == true, exactly one of 'response'
      // or 'error' is set.
      if (operationResponseInstance.response == null
          || Strings.isNullOrEmpty(operationResponseInstance.response.appId)) {
        String message = buildMessage(
            projectId,
            "Project ID",
            "Unable to create App: internal server error.");
        throw new FirebaseProjectManagementException(ErrorCode.INTERNAL, message, response);
      }
      return operationResponseInstance.response.appId;
    }

    String message = buildMessage(
        projectId,
        "Project ID",
        "Unable to create App: deadline exceeded.");
    throw new FirebaseProjectManagementException(ErrorCode.DEADLINE_EXCEEDED, message, null);
  }

  /**
   * An {@link ApiAsyncFunction} that transforms a Long Running Operation name to an {@link IosApp}
   * or an {@link AndroidApp} instance by repeatedly polling the server (with exponential backoff)
   * until the App is created successfully, or until the number of poll attempts exceeds the maximum
   * allowed.
   */
  private class WaitOperationFunction implements ApiAsyncFunction {
    private final String projectId;

    private WaitOperationFunction(String projectId) {
      this.projectId = projectId;
    }

    /**
     * Returns an {@link ApiFuture} that will eventually contain the App ID of the new created App,
     * or an exception if an error occurred during polling.
     */
    @Override
    public ApiFuture apply(String operationName) {
      SettableApiFuture settableFuture = SettableApiFuture.create();
      scheduler.schedule(
          new WaitOperationRunnable(
              /* numberOfPreviousPolls= */ 0,
              operationName,
              projectId,
              settableFuture),
          /* delayMillis= */ POLL_BASE_WAIT_TIME_MILLIS);
      return settableFuture;
    }
  }

  /**
   * A poller that repeatedly polls a Long Running Operation (with exponential backoff) until its
   * status is "done", or until the number of polling attempts exceeds the maximum allowed.
   */
  private class WaitOperationRunnable implements Runnable {
    private final int numberOfPreviousPolls;
    private final String operationName;
    private final String projectId;
    private final SettableApiFuture settableFuture;

    private WaitOperationRunnable(
        int numberOfPreviousPolls,
        String operationName,
        String projectId,
        SettableApiFuture settableFuture) {
      this.numberOfPreviousPolls = numberOfPreviousPolls;
      this.operationName = operationName;
      this.projectId = projectId;
      this.settableFuture = settableFuture;
    }

    @Override
    public void run() {
      String url = String.format("%s/v1/%s", FIREBASE_PROJECT_MANAGEMENT_URL, operationName);
      OperationResponse operationResponseInstance = new OperationResponse();
      IncomingHttpResponse httpResponse;
      try {
        httpResponse = httpHelper.makeGetRequest(
            url, operationResponseInstance, projectId, "Project ID");
      } catch (FirebaseProjectManagementException e) {
        settableFuture.setException(e);
        return;
      }
      if (!operationResponseInstance.done) {
        if (numberOfPreviousPolls + 1 >= MAXIMUM_POLLING_ATTEMPTS) {
          String message = buildMessage(projectId,
              "Project ID",
              "Unable to create App: deadline exceeded.");
          FirebaseProjectManagementException exception = new FirebaseProjectManagementException(
              ErrorCode.DEADLINE_EXCEEDED, message, httpResponse);
          settableFuture.setException(exception);
        } else {
          long delayMillis = (long) (
              POLL_BASE_WAIT_TIME_MILLIS
                  * Math.pow(POLL_EXPONENTIAL_BACKOFF_FACTOR, numberOfPreviousPolls + 1));
          scheduler.schedule(
              new WaitOperationRunnable(
                  numberOfPreviousPolls + 1,
                  operationName,
                  projectId,
                  settableFuture),
              delayMillis);
        }
        return;
      }
      // The Long Running Operation API guarantees that when done == true, exactly one of 'response'
      // or 'error' is set.
      if (operationResponseInstance.response == null
          || Strings.isNullOrEmpty(operationResponseInstance.response.appId)) {
        String message = buildMessage(projectId,
            "Project ID",
            "Unable to create App: internal server error.");
        FirebaseProjectManagementException exception = new FirebaseProjectManagementException(
            ErrorCode.INTERNAL, message, httpResponse);
        settableFuture.setException(exception);
      } else {
        settableFuture.set(operationResponseInstance.response.appId);
      }
    }
  }

  // This class is public due to the way parsing nested JSON objects work, and is needed by
  // create{Android|Ios}App and list{Android|Ios}Apps. In any case, the containing class,
  // FirebaseProjectManagementServiceImpl, is package-private.
  public static class AppResponse {
    @Key("name")
    protected String name;

    @Key("appId")
    protected String appId;

    @Key("displayName")
    protected String displayName;

    @Key("projectId")
    protected String projectId;
  }

  private static class AndroidAppResponse extends AppResponse {
    @Key("packageName")
    private String packageName;
  }

  private static class IosAppResponse extends AppResponse {
    @Key("bundleId")
    private String bundleId;
  }

  // This class is public due to the way parsing nested JSON objects work, and is needed by
  // createIosApp and createAndroidApp. In any case, the containing class,
  // FirebaseProjectManagementServiceImpl, is package-private.
  public static class StatusResponse {
    @Key("code")
    private int code;

    @Key("message")
    private String message;
  }

  private static class OperationResponse {
    @Key("name")
    private String name;

    @Key("metadata")
    private String metadata;

    @Key("done")
    private boolean done;

    @Key("error")
    private StatusResponse error;

    @Key("response")
    private AppResponse response;
  }

  /* setAndroidDisplayName, setIosDisplayName */

  @Override
  public void setAndroidDisplayName(String appId, String newDisplayName)
      throws FirebaseProjectManagementException {
    setAndroidDisplayNameOp(appId, newDisplayName).call();
  }

  @Override
  public ApiFuture setAndroidDisplayNameAsync(String appId, String newDisplayName) {
    return setAndroidDisplayNameOp(appId, newDisplayName).callAsync(app);
  }

  @Override
  public void setIosDisplayName(String appId, String newDisplayName)
      throws FirebaseProjectManagementException {
    setIosDisplayNameOp(appId, newDisplayName).call();
  }

  @Override
  public ApiFuture setIosDisplayNameAsync(String appId, String newDisplayName) {
    return setIosDisplayNameOp(appId, newDisplayName).callAsync(app);
  }

  private CallableOperation setAndroidDisplayNameOp(
      String appId, String newDisplayName) {
    return setDisplayNameOp(appId, newDisplayName, ANDROID_APPS_RESOURCE_NAME);
  }

  private CallableOperation setIosDisplayNameOp(
      String appId, String newDisplayName) {
    return setDisplayNameOp(appId, newDisplayName, IOS_APPS_RESOURCE_NAME);
  }

  private CallableOperation setDisplayNameOp(
      final String appId, final String newDisplayName, final String platformResourceName) {
    checkArgument(
        !Strings.isNullOrEmpty(newDisplayName), "new Display Name must not be null or empty");
    return new CallableOperation() {
      @Override
      protected Void execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/projects/-/%s/%s?update_mask=display_name",
            FIREBASE_PROJECT_MANAGEMENT_URL,
            platformResourceName,
            appId);
        ImmutableMap payload =
            ImmutableMap.builder().put("display_name", newDisplayName).build();
        EmptyResponse emptyResponseInstance = new EmptyResponse();
        httpHelper.makePatchRequest(url, payload, emptyResponseInstance, appId, "App ID");
        return null;
      }
    };
  }

  private static class EmptyResponse {}

  /* getAndroidConfig, getIosConfig */

  @Override
  public String getAndroidConfig(String appId) throws FirebaseProjectManagementException {
    return getAndroidConfigOp(appId).call();
  }

  @Override
  public ApiFuture getAndroidConfigAsync(String appId) {
    return getAndroidConfigOp(appId).callAsync(app);
  }

  @Override
  public String getIosConfig(String appId) throws FirebaseProjectManagementException {
    return getIosConfigOp(appId).call();
  }

  @Override
  public ApiFuture getIosConfigAsync(String appId) {
    return getIosConfigOp(appId).callAsync(app);
  }

  private CallableOperation getAndroidConfigOp(
      String appId) {
    return getConfigOp(appId, ANDROID_APPS_RESOURCE_NAME);
  }

  private CallableOperation getIosConfigOp(
      String appId) {
    return getConfigOp(appId, IOS_APPS_RESOURCE_NAME);
  }

  private CallableOperation getConfigOp(
      final String appId, final String platformResourceName) {
    return new CallableOperation() {
      @Override
      protected String execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/projects/-/%s/%s/config",
            FIREBASE_PROJECT_MANAGEMENT_URL,
            platformResourceName,
            appId);
        AppConfigResponse parsedResponse = new AppConfigResponse();
        httpHelper.makeGetRequest(url, parsedResponse, appId, "App ID");
        return new String(
            Base64.decodeBase64(parsedResponse.configFileContents), StandardCharsets.UTF_8);
      }
    };
  }

  private static class AppConfigResponse {
    @Key("configFilename")
    String configFilename;

    @Key("configFileContents")
    String configFileContents;
  }

  /* getShaCertificates */

  @Override
  public List getShaCertificates(String appId)
      throws FirebaseProjectManagementException {
    return getShaCertificatesOp(appId).call();
  }

  @Override
  public ApiFuture> getShaCertificatesAsync(String appId) {
    return getShaCertificatesOp(appId).callAsync(app);
  }

  private CallableOperation, FirebaseProjectManagementException>
      getShaCertificatesOp(final String appId) {
    return new CallableOperation, FirebaseProjectManagementException>() {
      @Override
      protected List execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/projects/-/androidApps/%s/sha", FIREBASE_PROJECT_MANAGEMENT_URL, appId);
        ListShaCertificateResponse parsedResponse = new ListShaCertificateResponse();
        httpHelper.makeGetRequest(url, parsedResponse, appId, "App ID");
        List certificates = new ArrayList<>();
        if (parsedResponse.certificates == null) {
          return certificates;
        }
        for (ShaCertificateResponse certificate : parsedResponse.certificates) {
          certificates.add(ShaCertificate.create(certificate.name, certificate.shaHash));
        }
        return certificates;
      }
    };
  }

  /* createShaCertificate */

  @Override
  public ShaCertificate createShaCertificate(String appId, ShaCertificate certificateToAdd)
      throws FirebaseProjectManagementException {
    return createShaCertificateOp(appId, certificateToAdd).call();
  }

  @Override
  public ApiFuture createShaCertificateAsync(
      String appId, ShaCertificate certificateToAdd) {
    return createShaCertificateOp(appId, certificateToAdd).callAsync(app);
  }

  private CallableOperation
      createShaCertificateOp(final String appId, final ShaCertificate certificateToAdd) {
    return new CallableOperation() {
      @Override
      protected ShaCertificate execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/projects/-/androidApps/%s/sha", FIREBASE_PROJECT_MANAGEMENT_URL, appId);
        ShaCertificateResponse parsedResponse = new ShaCertificateResponse();
        ImmutableMap payload = ImmutableMap.builder()
            .put("sha_hash", certificateToAdd.getShaHash())
            .put("cert_type", certificateToAdd.getCertType().toString())
            .build();
        httpHelper.makePostRequest(url, payload, parsedResponse, appId, "App ID");
        return ShaCertificate.create(parsedResponse.name, parsedResponse.shaHash);
      }
    };
  }

  /* deleteShaCertificate */

  @Override
  public void deleteShaCertificate(String resourceName)
      throws FirebaseProjectManagementException {
    deleteShaCertificateOp(resourceName).call();
  }

  @Override
  public ApiFuture deleteShaCertificateAsync(String resourceName) {
    return deleteShaCertificateOp(resourceName).callAsync(app);
  }

  private CallableOperation deleteShaCertificateOp(
      final String resourceName) {
    return new CallableOperation() {
      @Override
      protected Void execute() throws FirebaseProjectManagementException {
        String url = String.format(
            "%s/v1beta1/%s", FIREBASE_PROJECT_MANAGEMENT_URL, resourceName);
        EmptyResponse parsedResponse = new EmptyResponse();
        httpHelper.makeDeleteRequest(url, parsedResponse, resourceName, "SHA name");
        return null;
      }
    };
  }

  private static class ListShaCertificateResponse {
    @Key("certificates")
    private List certificates;
  }

  // This class is public due to the way parsing nested JSON objects work, and is needed by
  // getShaCertificates. In any case, the containing class, FirebaseProjectManagementServiceImpl, is
  // package-private.
  public static class ShaCertificateResponse {
    @Key("name")
    private String name;

    @Key("shaHash")
    private String shaHash;

    @Key("certType")
    private String certType;
  }

  private static class FirebaseAppScheduler implements Scheduler {

    private final FirebaseApp app;

    FirebaseAppScheduler(FirebaseApp app) {
      this.app = checkNotNull(app);
    }

    @Override
    public void schedule(Runnable runnable, long delayMillis) {
      ImplFirebaseTrampolines.schedule(app, runnable, delayMillis);
    }
  }

  /* Helper methods. */

  private void sleepOrThrow(String projectId, long delayMillis)
      throws FirebaseProjectManagementException {
    try {
      sleeper.sleep(delayMillis);
    } catch (InterruptedException e) {
      String message = buildMessage(projectId,
          "Project ID",
          "Unable to create App: exponential backoff interrupted.");
      throw new FirebaseProjectManagementException(ErrorCode.ABORTED, message, null);
    }
  }

  private String buildMessage(String resourceId, String resourceIdName, String description) {
    return String.format("%s \"%s\": %s", resourceIdName, resourceId, description);
  }

  /* Helper types. */

  private interface CreateAppFromAppIdFunction extends ApiFunction {}

  private class CreateAndroidAppFromAppIdFunction
      implements CreateAppFromAppIdFunction {
    @Override
    public AndroidApp apply(String appId) {
      return new AndroidApp(appId, FirebaseProjectManagementServiceImpl.this);
    }
  }

  private class CreateIosAppFromAppIdFunction implements CreateAppFromAppIdFunction {
    @Override
    public IosApp apply(String appId) {
      return new IosApp(appId, FirebaseProjectManagementServiceImpl.this);
    }
  }
}




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