Defines the TenantManager class and its underlying methods. (#617)

* Defines the TenantManager class and its underlying methods.
Adds unit tests for this new class. Unit tests were copied from the
exising auth.spec.ts file.

src/auth/tenant-manager.ts

@@ -0,0 +1,149 @@
+/*!
+ * Copyright 2019 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.
+ */
+
+import {AuthRequestHandler} from './auth-api-request';
+import {FirebaseApp} from '../firebase-app';
+import {TenantAwareAuth} from './auth';
+import {
+  Tenant, TenantServerResponse, ListTenantsResult, TenantOptions,
+} from './tenant';
+import {AuthClientErrorCode, FirebaseAuthError} from '../utils/error';
+import * as validator from '../utils/validator';
+
+/**
+ * Data structure used to help manage tenant related operations.
+ * This includes:
+ * - The ability to create, update, list, get and delete tenants for the underlying project.
+ * - Getting a TenantAwareAuth instance for running Auth related operations (user mgmt, provider config mgmt, etc)
+ *   in the context of a specified tenant.
+ */
+export class TenantManager {
+  private readonly authRequestHandler: AuthRequestHandler;
+  private readonly tenantsMap: {[key: string]: TenantAwareAuth};
+
+  /**
+   * Initializes a TenantManager instance for a specified FirebaseApp.
+   * @param app The app for this TenantManager instance.
+   */
+  constructor(private readonly app: FirebaseApp) {
+    this.authRequestHandler = new AuthRequestHandler(app);
+    this.tenantsMap = {};
+  }
+
+  /**
+   * Returns a TenantAwareAuth instance for the corresponding tenant ID.
+   *
+   * @param tenantId The tenant ID whose TenantAwareAuth is to be returned.
+   * @return The corresponding TenantAwareAuth instance.
+   */
+  public authForTenant(tenantId: string): TenantAwareAuth {
+    if (!validator.isNonEmptyString(tenantId)) {
+      throw new FirebaseAuthError(AuthClientErrorCode.INVALID_TENANT_ID);
+    }
+    if (typeof this.tenantsMap[tenantId] === 'undefined') {
+      this.tenantsMap[tenantId] = new TenantAwareAuth(this.app, tenantId);
+    }
+    return this.tenantsMap[tenantId];
+  }
+
+  /**
+   * Looks up the tenant identified by the provided tenant ID and returns a promise that is
+   * fulfilled with the corresponding tenant if it is found.
+   *
+   * @param tenantId The tenant ID of the tenant to look up.
+   * @return A promise that resolves with the corresponding tenant.
+   */
+  public getTenant(tenantId: string): Promise<Tenant> {
+    return this.authRequestHandler.getTenant(tenantId)
+      .then((response: TenantServerResponse) => {
+        return new Tenant(response);
+      });
+  }
+
+  /**
+   * Exports a batch of tenant accounts. Batch size is determined by the maxResults argument.
+   * Starting point of the batch is determined by the pageToken argument.
+   *
+   * @param maxResults The page size, 1000 if undefined. This is also the maximum
+   *     allowed limit.
+   * @param pageToken The next page token. If not specified, returns users starting
+   *     without any offset.
+   * @return A promise that resolves with
+   *     the current batch of downloaded tenants and the next page token. For the last page, an
+   *     empty list of tenants and no page token are returned.
+   */
+  public listTenants(
+      maxResults?: number,
+      pageToken?: string): Promise<ListTenantsResult> {
+    return this.authRequestHandler.listTenants(maxResults, pageToken)
+      .then((response: {tenants: TenantServerResponse[], nextPageToken?: string}) => {
+        // List of tenants to return.
+        const tenants: Tenant[] = [];
+        // Convert each user response to a Tenant.
+        response.tenants.forEach((tenantResponse: TenantServerResponse) => {
+          tenants.push(new Tenant(tenantResponse));
+        });
+        // Return list of tenants and the next page token if available.
+        const result = {
+          tenants,
+          pageToken: response.nextPageToken,
+        };
+        // Delete result.pageToken if undefined.
+        if (typeof result.pageToken === 'undefined') {
+          delete result.pageToken;
+        }
+        return result;
+      });
+  }
+
+  /**
+   * Deletes the tenant identified by the provided tenant ID and returns a promise that is
+   * fulfilled when the tenant is found and successfully deleted.
+   *
+   * @param tenantId The tenant ID of the tenant to delete.
+   * @return A promise that resolves when the tenant is successfully deleted.
+   */
+  public deleteTenant(tenantId: string): Promise<void> {
+    return this.authRequestHandler.deleteTenant(tenantId);
+  }
+
+  /**
+   * Creates a new tenant with the properties provided.
+   *
+   * @param tenantOptions The properties to set on the new tenant to be created.
+   * @return A promise that resolves with the newly created tenant.
+   */
+  public createTenant(tenantOptions: TenantOptions): Promise<Tenant> {
+    return this.authRequestHandler.createTenant(tenantOptions)
+      .then((response: TenantServerResponse) => {
+        return new Tenant(response);
+      });
+  }
+
+  /**
+   * Updates an existing tenant identified by the tenant ID with the properties provided.
+   *
+   * @param tenantId The tenant identifier of the tenant to update.
+   * @param tenantOptions The properties to update on the existing tenant.
+   * @return A promise that resolves with the modified tenant.
+   */
+  public updateTenant(tenantId: string, tenantOptions: TenantOptions): Promise<Tenant> {
+    return this.authRequestHandler.updateTenant(tenantId, tenantOptions)
+      .then((response: TenantServerResponse) => {
+        return new Tenant(response);
+      });
+  }
+}