264 lines
11 KiB
JavaScript
264 lines
11 KiB
JavaScript
"use strict";
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// The MIT License (MIT)
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//
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// Copyright (c) 2017 Firebase
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.extractInstanceAndPath = exports.RefBuilder = exports._refWithOptions = exports.InstanceBuilder = exports._instanceWithOptions = exports.ref = exports.instance = exports.service = exports.provider = exports.DataSnapshot = void 0;
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const apps_1 = require("../apps");
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const cloud_functions_1 = require("../cloud-functions");
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const database_1 = require("../common/providers/database");
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Object.defineProperty(exports, "DataSnapshot", { enumerable: true, get: function () { return database_1.DataSnapshot; } });
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const config_1 = require("../config");
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const path_1 = require("../utilities/path");
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const utils_1 = require("../utils");
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/** @hidden */
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exports.provider = 'google.firebase.database';
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/** @hidden */
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exports.service = 'firebaseio.com';
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const databaseURLRegex = new RegExp('^https://([^.]+).');
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const emulatorDatabaseURLRegex = new RegExp('^http://.*ns=([^&]+)');
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/**
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* Registers a function that triggers on events from a specific
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* Firebase Realtime Database instance.
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*
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* Use this method together with `ref` to specify the instance on which to
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* watch for database events. For example: `firebase.database.instance('my-app-db-2').ref('/foo/bar')`
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*
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* Note that `functions.database.ref` used without `instance` watches the
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* *default* instance for events.
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*
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* @param instance The instance name of the database instance
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* to watch for write events.
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* @return Firebase Realtime Database instance builder interface.
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*/
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function instance(instance) {
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return _instanceWithOptions(instance, {});
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}
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exports.instance = instance;
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/**
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* Registers a function that triggers on Firebase Realtime Database write
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* events.
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*
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* This method behaves very similarly to the method of the same name in the
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* client and Admin Firebase SDKs. Any change to the Database that affects the
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* data at or below the provided `path` will fire an event in Cloud Functions.
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*
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* There are three important differences between listening to a Realtime
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* Database event in Cloud Functions and using the Realtime Database in the
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* client and Admin SDKs:
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* 1. Cloud Functions allows wildcards in the `path` name. Any `path` component
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* in curly brackets (`{}`) is a wildcard that matches all strings. The value
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* that matched a certain invocation of a Cloud Function is returned as part
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* of the [`EventContext.params`](cloud_functions_eventcontext.html#params object. For
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* example, `ref("messages/{messageId}")` matches changes at
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* `/messages/message1` or `/messages/message2`, resulting in
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* `event.params.messageId` being set to `"message1"` or `"message2"`,
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* respectively.
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* 2. Cloud Functions do not fire an event for data that already existed before
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* the Cloud Function was deployed.
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* 3. Cloud Function events have access to more information, including a
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* snapshot of the previous event data and information about the user who
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* triggered the Cloud Function.
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*
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* @param path The path within the Database to watch for write events.
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* @return Firebase Realtime Database builder interface.
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*/
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function ref(path) {
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return _refWithOptions(path, {});
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}
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exports.ref = ref;
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/** @hidden */
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function _instanceWithOptions(instance, options) {
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return new InstanceBuilder(instance, options);
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}
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exports._instanceWithOptions = _instanceWithOptions;
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/**
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* The Firebase Realtime Database instance builder interface.
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*
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* Access via [`database.instance()`](providers_database_.html#instance).
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*/
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class InstanceBuilder {
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/** @hidden */
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constructor(instance, options) {
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this.instance = instance;
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this.options = options;
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}
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/**
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* @return Firebase Realtime Database reference builder interface.
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*/
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ref(path) {
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const normalized = (0, path_1.normalizePath)(path);
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return new RefBuilder((0, apps_1.apps)(), () => `projects/_/instances/${this.instance}/refs/${normalized}`, this.options);
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}
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}
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exports.InstanceBuilder = InstanceBuilder;
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/** @hidden */
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function _refWithOptions(path, options) {
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const resourceGetter = () => {
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const normalized = (0, path_1.normalizePath)(path);
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const databaseURL = (0, config_1.firebaseConfig)().databaseURL;
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if (!databaseURL) {
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throw new Error('Missing expected firebase config value databaseURL, ' +
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'config is actually' +
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JSON.stringify((0, config_1.firebaseConfig)()) +
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'\n If you are unit testing, please set process.env.FIREBASE_CONFIG');
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}
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let instance;
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const prodMatch = databaseURL.match(databaseURLRegex);
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if (prodMatch) {
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instance = prodMatch[1];
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}
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else {
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const emulatorMatch = databaseURL.match(emulatorDatabaseURLRegex);
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if (emulatorMatch) {
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instance = emulatorMatch[1];
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}
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}
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if (!instance) {
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throw new Error('Invalid value for config firebase.databaseURL: ' + databaseURL);
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}
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return `projects/_/instances/${instance}/refs/${normalized}`;
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};
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return new RefBuilder((0, apps_1.apps)(), resourceGetter, options);
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}
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exports._refWithOptions = _refWithOptions;
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/**
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* The Firebase Realtime Database reference builder interface.
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*
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* Access via [`functions.database.ref()`](functions.database#.ref).
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*/
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class RefBuilder {
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/** @hidden */
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constructor(apps, triggerResource, options) {
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this.apps = apps;
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this.triggerResource = triggerResource;
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this.options = options;
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this.changeConstructor = (raw) => {
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const [dbInstance, path] = extractInstanceAndPath(raw.context.resource.name, raw.context.domain);
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const before = new database_1.DataSnapshot(raw.data.data, path, this.apps.admin, dbInstance);
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const after = new database_1.DataSnapshot((0, utils_1.applyChange)(raw.data.data, raw.data.delta), path, this.apps.admin, dbInstance);
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return {
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before,
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after,
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};
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};
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}
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/**
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* Event handler that fires every time a Firebase Realtime Database write
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* of any kind (creation, update, or delete) occurs.
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*
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* @param handler Event handler that runs every time a Firebase Realtime Database
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* write occurs.
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* @return A Cloud Function that you can export and deploy.
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*/
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onWrite(handler) {
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return this.onOperation(handler, 'ref.write', this.changeConstructor);
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}
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/**
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* Event handler that fires every time data is updated in
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* Firebase Realtime Database.
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*
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* @param handler Event handler which is run every time a Firebase Realtime Database
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* write occurs.
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* @return A Cloud
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* Function which you can export and deploy.
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*/
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onUpdate(handler) {
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return this.onOperation(handler, 'ref.update', this.changeConstructor);
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}
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/**
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* Event handler that fires every time new data is created in
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* Firebase Realtime Database.
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*
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* @param handler Event handler that runs every time new data is created in
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* Firebase Realtime Database.
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* @return A Cloud Function that you can export and deploy.
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*/
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onCreate(handler) {
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const dataConstructor = (raw) => {
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const [dbInstance, path] = extractInstanceAndPath(raw.context.resource.name, raw.context.domain);
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return new database_1.DataSnapshot(raw.data.delta, path, this.apps.admin, dbInstance);
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};
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return this.onOperation(handler, 'ref.create', dataConstructor);
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}
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/**
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* Event handler that fires every time data is deleted from
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* Firebase Realtime Database.
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*
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* @param handler Event handler that runs every time data is deleted from
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* Firebase Realtime Database.
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* @return A Cloud Function that you can export and deploy.
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*/
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onDelete(handler) {
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const dataConstructor = (raw) => {
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const [dbInstance, path] = extractInstanceAndPath(raw.context.resource.name, raw.context.domain);
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return new database_1.DataSnapshot(raw.data.data, path, this.apps.admin, dbInstance);
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};
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return this.onOperation(handler, 'ref.delete', dataConstructor);
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}
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onOperation(handler, eventType, dataConstructor) {
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return (0, cloud_functions_1.makeCloudFunction)({
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handler,
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provider: exports.provider,
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service: exports.service,
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eventType,
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legacyEventType: `providers/${exports.provider}/eventTypes/${eventType}`,
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triggerResource: this.triggerResource,
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dataConstructor,
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before: (event) => this.apps.retain(),
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after: (event) => this.apps.release(),
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options: this.options,
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});
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}
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}
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exports.RefBuilder = RefBuilder;
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const resourceRegex = /^projects\/([^/]+)\/instances\/([a-zA-Z0-9-]+)\/refs(\/.+)?/;
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/**
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* Utility function to extract database reference from resource string
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*
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* @param optional database domain override for the original of the source database.
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* It defaults to `firebaseio.com`.
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* Multi-region RTDB will be served from different domains.
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* Since region is not part of the resource name, it is provided through context.
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*/
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/** @hidden */
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function extractInstanceAndPath(resource, domain = 'firebaseio.com') {
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const match = resource.match(new RegExp(resourceRegex));
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if (!match) {
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throw new Error(`Unexpected resource string for Firebase Realtime Database event: ${resource}. ` +
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'Expected string in the format of "projects/_/instances/{firebaseioSubdomain}/refs/{ref=**}"');
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}
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const [, project, dbInstanceName, path] = match;
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if (project !== '_') {
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throw new Error(`Expect project to be '_' in a Firebase Realtime Database event`);
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}
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const emuHost = process.env.FIREBASE_DATABASE_EMULATOR_HOST;
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if (emuHost) {
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const dbInstance = `http://${emuHost}/?ns=${dbInstanceName}`;
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return [dbInstance, path];
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}
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else {
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const dbInstance = 'https://' + dbInstanceName + '.' + domain;
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return [dbInstance, path];
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}
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}
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exports.extractInstanceAndPath = extractInstanceAndPath;
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