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website/functions/node_modules/firebase-admin/lib/messaging/messaging.js

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+/*! firebase-admin v6.0.0 */
+"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 index_1 = require("../utils/index");
+var deep_copy_1 = require("../utils/deep-copy");
+var messaging_api_request_1 = require("./messaging-api-request");
+var error_1 = require("../utils/error");
+var utils = require("../utils");
+var validator = require("../utils/validator");
+// FCM endpoints
+var FCM_SEND_HOST = 'fcm.googleapis.com';
+var FCM_SEND_PATH = '/fcm/send';
+var FCM_TOPIC_MANAGEMENT_HOST = 'iid.googleapis.com';
+var FCM_TOPIC_MANAGEMENT_ADD_PATH = '/iid/v1:batchAdd';
+var FCM_TOPIC_MANAGEMENT_REMOVE_PATH = '/iid/v1:batchRemove';
+// Key renames for the messaging notification payload object.
+var CAMELCASED_NOTIFICATION_PAYLOAD_KEYS_MAP = {
+    bodyLocArgs: 'body_loc_args',
+    bodyLocKey: 'body_loc_key',
+    clickAction: 'click_action',
+    titleLocArgs: 'title_loc_args',
+    titleLocKey: 'title_loc_key',
+};
+// Key renames for the messaging options object.
+var CAMELCASE_OPTIONS_KEYS_MAP = {
+    dryRun: 'dry_run',
+    timeToLive: 'time_to_live',
+    collapseKey: 'collapse_key',
+    mutableContent: 'mutable_content',
+    contentAvailable: 'content_available',
+    restrictedPackageName: 'restricted_package_name',
+};
+// Key renames for the MessagingDeviceResult object.
+var MESSAGING_DEVICE_RESULT_KEYS_MAP = {
+    message_id: 'messageId',
+    registration_id: 'canonicalRegistrationToken',
+};
+// Key renames for the MessagingDevicesResponse object.
+var MESSAGING_DEVICES_RESPONSE_KEYS_MAP = {
+    canonical_ids: 'canonicalRegistrationTokenCount',
+    failure: 'failureCount',
+    success: 'successCount',
+    multicast_id: 'multicastId',
+};
+// Key renames for the MessagingDeviceGroupResponse object.
+var MESSAGING_DEVICE_GROUP_RESPONSE_KEYS_MAP = {
+    success: 'successCount',
+    failure: 'failureCount',
+    failed_registration_ids: 'failedRegistrationTokens',
+};
+// Key renames for the MessagingTopicResponse object.
+var MESSAGING_TOPIC_RESPONSE_KEYS_MAP = {
+    message_id: 'messageId',
+};
+// Key renames for the MessagingConditionResponse object.
+var MESSAGING_CONDITION_RESPONSE_KEYS_MAP = {
+    message_id: 'messageId',
+};
+// Keys which are not allowed in the messaging data payload object.
+exports.BLACKLISTED_DATA_PAYLOAD_KEYS = ['from'];
+// Keys which are not allowed in the messaging options object.
+exports.BLACKLISTED_OPTIONS_KEYS = [
+    'condition', 'data', 'notification', 'registrationIds', 'registration_ids', 'to',
+];
+/**
+ * Checks if the given object only contains strings as child values.
+ *
+ * @param {object} map An object to be validated.
+ * @param {string} label A label to be included in the errors thrown.
+ */
+function validateStringMap(map, label) {
+    if (typeof map === 'undefined') {
+        return;
+    }
+    else if (!validator.isNonNullObject(map)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, label + " must be a non-null object");
+    }
+    Object.keys(map).forEach(function (key) {
+        if (!validator.isString(map[key])) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, label + " must only contain string values");
+        }
+    });
+}
+/**
+ * Checks if the given WebpushConfig object is valid. The object must have valid headers and data.
+ *
+ * @param {WebpushConfig} config An object to be validated.
+ */
+function validateWebpushConfig(config) {
+    if (typeof config === 'undefined') {
+        return;
+    }
+    else if (!validator.isNonNullObject(config)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'webpush must be a non-null object');
+    }
+    validateStringMap(config.headers, 'webpush.headers');
+    validateStringMap(config.data, 'webpush.data');
+}
+/**
+ * Checks if the given ApnsConfig object is valid. The object must have valid headers and a
+ * payload.
+ *
+ * @param {ApnsConfig} config An object to be validated.
+ */
+function validateApnsConfig(config) {
+    if (typeof config === 'undefined') {
+        return;
+    }
+    else if (!validator.isNonNullObject(config)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'apns must be a non-null object');
+    }
+    validateStringMap(config.headers, 'apns.headers');
+    validateApnsPayload(config.payload);
+}
+/**
+ * Checks if the given ApnsPayload object is valid. The object must have a valid aps value.
+ *
+ * @param {ApnsPayload} payload An object to be validated.
+ */
+function validateApnsPayload(payload) {
+    if (typeof payload === 'undefined') {
+        return;
+    }
+    else if (!validator.isNonNullObject(payload)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'apns.payload must be a non-null object');
+    }
+    validateAps(payload.aps);
+}
+/**
+ * Checks if the given Aps object is valid. The object must have a valid alert. If the validation
+ * is successful, transforms the input object by renaming the keys to valid APNS payload keys.
+ *
+ * @param {Aps} aps An object to be validated.
+ */
+function validateAps(aps) {
+    if (typeof aps === 'undefined') {
+        return;
+    }
+    else if (!validator.isNonNullObject(aps)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'apns.payload.aps must be a non-null object');
+    }
+    validateApsAlert(aps.alert);
+    var propertyMappings = {
+        contentAvailable: 'content-available',
+        mutableContent: 'mutable-content',
+        threadId: 'thread-id',
+    };
+    Object.keys(propertyMappings).forEach(function (key) {
+        if (key in aps && propertyMappings[key] in aps) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, "Multiple specifications for " + key + " in Aps");
+        }
+    });
+    index_1.renameProperties(aps, propertyMappings);
+    var contentAvailable = aps['content-available'];
+    if (typeof contentAvailable !== 'undefined' && contentAvailable !== 1) {
+        if (contentAvailable === true) {
+            aps['content-available'] = 1;
+        }
+        else {
+            delete aps['content-available'];
+        }
+    }
+    var mutableContent = aps['mutable-content'];
+    if (typeof mutableContent !== 'undefined' && mutableContent !== 1) {
+        if (mutableContent === true) {
+            aps['mutable-content'] = 1;
+        }
+        else {
+            delete aps['mutable-content'];
+        }
+    }
+}
+/**
+ * Checks if the given alert object is valid. Alert could be a string or a complex object.
+ * If specified as an object, it must have valid localization parameters. If successful, transforms
+ * the input object by renaming the keys to valid APNS payload keys.
+ *
+ * @param {string | ApsAlert} alert An alert string or an object to be validated.
+ */
+function validateApsAlert(alert) {
+    if (typeof alert === 'undefined' || validator.isString(alert)) {
+        return;
+    }
+    else if (!validator.isNonNullObject(alert)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'apns.payload.aps.alert must be a string or a non-null object');
+    }
+    var apsAlert = alert;
+    if (validator.isNonEmptyArray(apsAlert.locArgs) &&
+        !validator.isNonEmptyString(apsAlert.locKey)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'apns.payload.aps.alert.locKey is required when specifying locArgs');
+    }
+    if (validator.isNonEmptyArray(apsAlert.titleLocArgs) &&
+        !validator.isNonEmptyString(apsAlert.titleLocKey)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'apns.payload.aps.alert.titleLocKey is required when specifying titleLocArgs');
+    }
+    var propertyMappings = {
+        locKey: 'loc-key',
+        locArgs: 'loc-args',
+        titleLocKey: 'title-loc-key',
+        titleLocArgs: 'title-loc-args',
+        actionLocKey: 'action-loc-key',
+        launchImage: 'launch-image',
+    };
+    index_1.renameProperties(apsAlert, propertyMappings);
+}
+/**
+ * Checks if the given AndroidConfig object is valid. The object must have valid ttl, data,
+ * and notification fields. If successful, transforms the input object by renaming keys to valid
+ * Android keys. Also transforms the ttl value to the format expected by FCM service.
+ *
+ * @param {AndroidConfig} config An object to be validated.
+ */
+function validateAndroidConfig(config) {
+    if (typeof config === 'undefined') {
+        return;
+    }
+    else if (!validator.isNonNullObject(config)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'android must be a non-null object');
+    }
+    if (typeof config.ttl !== 'undefined') {
+        if (!validator.isNumber(config.ttl) || config.ttl < 0) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'TTL must be a non-negative duration in milliseconds');
+        }
+        var seconds = Math.floor(config.ttl / 1000);
+        var nanos = (config.ttl - seconds * 1000) * 1000000;
+        var duration = void 0;
+        if (nanos > 0) {
+            var nanoString = nanos.toString();
+            while (nanoString.length < 9) {
+                nanoString = '0' + nanoString;
+            }
+            duration = seconds + "." + nanoString + "s";
+        }
+        else {
+            duration = seconds + "s";
+        }
+        config.ttl = duration;
+    }
+    validateStringMap(config.data, 'android.data');
+    validateAndroidNotification(config.notification);
+    var propertyMappings = {
+        collapseKey: 'collapse_key',
+        restrictedPackageName: 'restricted_package_name',
+    };
+    index_1.renameProperties(config, propertyMappings);
+}
+/**
+ * Checks if the given AndroidNotification object is valid. The object must have valid color and
+ * localization parameters. If successful, transforms the input object by renaming keys to valid
+ * Android keys.
+ *
+ * @param {AndroidNotification} notification An object to be validated.
+ */
+function validateAndroidNotification(notification) {
+    if (typeof notification === 'undefined') {
+        return;
+    }
+    else if (!validator.isNonNullObject(notification)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'android.notification must be a non-null object');
+    }
+    if (typeof notification.color !== 'undefined' && !/^#[0-9a-fA-F]{6}$/.test(notification.color)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'android.notification.color must be in the form #RRGGBB');
+    }
+    if (validator.isNonEmptyArray(notification.bodyLocArgs) &&
+        !validator.isNonEmptyString(notification.bodyLocKey)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'android.notification.bodyLocKey is required when specifying bodyLocArgs');
+    }
+    if (validator.isNonEmptyArray(notification.titleLocArgs) &&
+        !validator.isNonEmptyString(notification.titleLocKey)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'android.notification.titleLocKey is required when specifying titleLocArgs');
+    }
+    var propertyMappings = {
+        clickAction: 'click_action',
+        bodyLocKey: 'body_loc_key',
+        bodyLocArgs: 'body_loc_args',
+        titleLocKey: 'title_loc_key',
+        titleLocArgs: 'title_loc_args',
+    };
+    index_1.renameProperties(notification, propertyMappings);
+}
+/**
+ * Checks if the given Message object is valid. Recursively validates all the child objects
+ * included in the message (android, apns, data etc.). If successful, transforms the message
+ * in place by renaming the keys to what's expected by the remote FCM service.
+ *
+ * @param {Message} Message An object to be validated.
+ */
+function validateMessage(message) {
+    if (!validator.isNonNullObject(message)) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'Message must be a non-null object');
+    }
+    var anyMessage = message;
+    if (anyMessage.topic) {
+        // If the topic name is prefixed, remove it.
+        if (anyMessage.topic.startsWith('/topics/')) {
+            anyMessage.topic = anyMessage.topic.replace(/^\/topics\//, '');
+        }
+        // Checks for illegal characters and empty string.
+        if (!/^[a-zA-Z0-9-_.~%]+$/.test(anyMessage.topic)) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'Malformed topic name');
+        }
+    }
+    var targets = [anyMessage.token, anyMessage.topic, anyMessage.condition];
+    if (targets.filter(function (v) { return validator.isNonEmptyString(v); }).length !== 1) {
+        throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'Exactly one of topic, token or condition is required');
+    }
+    validateStringMap(message.data, 'data');
+    validateAndroidConfig(message.android);
+    validateWebpushConfig(message.webpush);
+    validateApnsConfig(message.apns);
+}
+/**
+ * Maps a raw FCM server response to a MessagingDevicesResponse object.
+ *
+ * @param {object} response The raw FCM server response to map.
+ *
+ * @return {MessagingDeviceGroupResponse} The mapped MessagingDevicesResponse object.
+ */
+function mapRawResponseToDevicesResponse(response) {
+    // Rename properties on the server response
+    utils.renameProperties(response, MESSAGING_DEVICES_RESPONSE_KEYS_MAP);
+    if ('results' in response) {
+        response.results.forEach(function (messagingDeviceResult) {
+            utils.renameProperties(messagingDeviceResult, MESSAGING_DEVICE_RESULT_KEYS_MAP);
+            // Map the FCM server's error strings to actual error objects.
+            if ('error' in messagingDeviceResult) {
+                var newError = error_1.FirebaseMessagingError.fromServerError(messagingDeviceResult.error, /* message */ undefined, messagingDeviceResult.error);
+                messagingDeviceResult.error = newError;
+            }
+        });
+    }
+    return response;
+}
+/**
+ * Maps a raw FCM server response to a MessagingDeviceGroupResponse object.
+ *
+ * @param {object} response The raw FCM server response to map.
+ *
+ * @return {MessagingDeviceGroupResponse} The mapped MessagingDeviceGroupResponse object.
+ */
+function mapRawResponseToDeviceGroupResponse(response) {
+    // Rename properties on the server response
+    utils.renameProperties(response, MESSAGING_DEVICE_GROUP_RESPONSE_KEYS_MAP);
+    // Add the 'failedRegistrationTokens' property if it does not exist on the response, which
+    // it won't when the 'failureCount' property has a value of 0)
+    response.failedRegistrationTokens = response.failedRegistrationTokens || [];
+    return response;
+}
+/**
+ * Maps a raw FCM server response to a MessagingTopicManagementResponse object.
+ *
+ * @param {object} response The raw FCM server response to map.
+ *
+ * @return {MessagingTopicManagementResponse} The mapped MessagingTopicManagementResponse object.
+ */
+function mapRawResponseToTopicManagementResponse(response) {
+    // Add the success and failure counts.
+    var result = {
+        successCount: 0,
+        failureCount: 0,
+        errors: [],
+    };
+    var errors = [];
+    if ('results' in response) {
+        response.results.forEach(function (tokenManagementResult, index) {
+            // Map the FCM server's error strings to actual error objects.
+            if ('error' in tokenManagementResult) {
+                result.failureCount += 1;
+                var newError = error_1.FirebaseMessagingError.fromTopicManagementServerError(tokenManagementResult.error, /* message */ undefined, tokenManagementResult.error);
+                result.errors.push({
+                    index: index,
+                    error: newError,
+                });
+            }
+            else {
+                result.successCount += 1;
+            }
+        });
+    }
+    return result;
+}
+/**
+ * Internals of a Messaging instance.
+ */
+var MessagingInternals = /** @class */ (function () {
+    function MessagingInternals() {
+    }
+    /**
+     * Deletes the service and its associated resources.
+     *
+     * @return {Promise<()>} An empty Promise that will be fulfilled when the service is deleted.
+     */
+    MessagingInternals.prototype.delete = function () {
+        // There are no resources to clean up.
+        return Promise.resolve(undefined);
+    };
+    return MessagingInternals;
+}());
+/**
+ * Messaging service bound to the provided app.
+ */
+var Messaging = /** @class */ (function () {
+    /**
+     * @param {FirebaseApp} app The app for this Messaging service.
+     * @constructor
+     */
+    function Messaging(app) {
+        this.INTERNAL = new MessagingInternals();
+        if (!validator.isNonNullObject(app) || !('options' in app)) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_ARGUMENT, 'First argument passed to admin.messaging() must be a valid Firebase app instance.');
+        }
+        var projectId = utils.getProjectId(app);
+        if (!validator.isNonEmptyString(projectId)) {
+            // Assert for an explicit projct ID (either via AppOptions or the cert itself).
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_ARGUMENT, 'Failed to determine project ID for Messaging. Initialize the '
+                + 'SDK with service account credentials or set project ID as an app option. '
+                + 'Alternatively set the GOOGLE_CLOUD_PROJECT environment variable.');
+        }
+        this.urlPath = "/v1/projects/" + projectId + "/messages:send";
+        this.appInternal = app;
+        this.messagingRequestHandler = new messaging_api_request_1.FirebaseMessagingRequestHandler(app);
+    }
+    Object.defineProperty(Messaging.prototype, "app", {
+        /**
+         * Returns the app associated with this Messaging instance.
+         *
+         * @return {FirebaseApp} The app associated with this Messaging instance.
+         */
+        get: function () {
+            return this.appInternal;
+        },
+        enumerable: true,
+        configurable: true
+    });
+    /**
+     * Sends a message via Firebase Cloud Messaging (FCM).
+     *
+     * @param {Message} message The message to be sent.
+     * @param {boolean=} dryRun Whether to send the message in the dry-run (validation only) mode.
+     *
+     * @return {Promise<string>} A Promise fulfilled with a message ID string.
+     */
+    Messaging.prototype.send = function (message, dryRun) {
+        var _this = this;
+        var copy = deep_copy_1.deepCopy(message);
+        validateMessage(copy);
+        if (typeof dryRun !== 'undefined' && !validator.isBoolean(dryRun)) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_ARGUMENT, 'dryRun must be a boolean');
+        }
+        return Promise.resolve()
+            .then(function () {
+            var request = { message: copy };
+            if (dryRun) {
+                request.validate_only = true;
+            }
+            return _this.messagingRequestHandler.invokeRequestHandler(FCM_SEND_HOST, _this.urlPath, request);
+        })
+            .then(function (response) {
+            return response.name;
+        });
+    };
+    /**
+     * Sends an FCM message to a single device or an array of devices.
+     *
+     * @param {string|string[]} registrationTokenOrTokens The registration token or an array of
+     *     registration tokens for the device(s) to which to send the message.
+     * @param {MessagingPayload} payload The message payload.
+     * @param {MessagingOptions} [options = {}] Optional options to alter the message.
+     *
+     * @return {Promise<MessagingDevicesResponse|MessagingDeviceGroupResponse>} A Promise fulfilled
+     *     with the server's response after the message has been sent.
+     */
+    Messaging.prototype.sendToDevice = function (registrationTokenOrTokens, payload, options) {
+        var _this = this;
+        if (options === void 0) { options = {}; }
+        // Validate the input argument types. Since these are common developer errors when getting
+        // started, throw an error instead of returning a rejected promise.
+        this.validateRegistrationTokensType(registrationTokenOrTokens, 'sendToDevice', error_1.MessagingClientErrorCode.INVALID_RECIPIENT);
+        this.validateMessagingPayloadAndOptionsTypes(payload, options);
+        return Promise.resolve()
+            .then(function () {
+            // Validate the contents of the input arguments. Because we are now in a promise, any thrown
+            // error will cause this method to return a rejected promise.
+            _this.validateRegistrationTokens(registrationTokenOrTokens, 'sendToDevice', error_1.MessagingClientErrorCode.INVALID_RECIPIENT);
+            var payloadCopy = _this.validateMessagingPayload(payload);
+            var optionsCopy = _this.validateMessagingOptions(options);
+            var request = deep_copy_1.deepCopy(payloadCopy);
+            deep_copy_1.deepExtend(request, optionsCopy);
+            if (validator.isString(registrationTokenOrTokens)) {
+                request.to = registrationTokenOrTokens;
+            }
+            else {
+                request.registration_ids = registrationTokenOrTokens;
+            }
+            return _this.messagingRequestHandler.invokeRequestHandler(FCM_SEND_HOST, FCM_SEND_PATH, request);
+        })
+            .then(function (response) {
+            // The sendToDevice() and sendToDeviceGroup() methods both set the `to` query parameter in
+            // the underlying FCM request. If the provided registration token argument is actually a
+            // valid notification key, the response from the FCM server will be a device group response.
+            // If that is the case, we map the response to a MessagingDeviceGroupResponse.
+            // See b/35394951 for more context.
+            if ('multicast_id' in response) {
+                return mapRawResponseToDevicesResponse(response);
+            }
+            else {
+                return mapRawResponseToDeviceGroupResponse(response);
+            }
+        });
+    };
+    /**
+     * Sends an FCM message to a device group.
+     *
+     * @param {string} notificationKey The notification key representing the device group to which to
+     *     send the message.
+     * @param {MessagingPayload} payload The message payload.
+     * @param {MessagingOptions} [options = {}] Optional options to alter the message.
+     *
+     * @return {Promise<MessagingDeviceGroupResponse|MessagingDevicesResponse>} A Promise fulfilled
+     *     with the server's response after the message has been sent.
+     */
+    Messaging.prototype.sendToDeviceGroup = function (notificationKey, payload, options) {
+        var _this = this;
+        if (options === void 0) { options = {}; }
+        if (!validator.isNonEmptyString(notificationKey)) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_RECIPIENT, 'Notification key provided to sendToDeviceGroup() must be a non-empty string.');
+        }
+        else if (notificationKey.indexOf(':') !== -1) {
+            // It is possible the developer provides a registration token instead of a notification key
+            // to this method. We can detect some of those cases by checking to see if the string contains
+            // a colon. Not all registration tokens will contain a colon (only newer ones will), but no
+            // notification keys will contain a colon, so we can use it as a rough heuristic.
+            // See b/35394951 for more context.
+            return Promise.reject(new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_RECIPIENT, 'Notification key provided to sendToDeviceGroup() has the format of a registration token. ' +
+                'You should use sendToDevice() instead.'));
+        }
+        // Validate the types of the payload and options arguments. Since these are common developer
+        // errors, throw an error instead of returning a rejected promise.
+        this.validateMessagingPayloadAndOptionsTypes(payload, options);
+        return Promise.resolve()
+            .then(function () {
+            // Validate the contents of the payload and options objects. Because we are now in a
+            // promise, any thrown error will cause this method to return a rejected promise.
+            var payloadCopy = _this.validateMessagingPayload(payload);
+            var optionsCopy = _this.validateMessagingOptions(options);
+            var request = deep_copy_1.deepCopy(payloadCopy);
+            deep_copy_1.deepExtend(request, optionsCopy);
+            request.to = notificationKey;
+            return _this.messagingRequestHandler.invokeRequestHandler(FCM_SEND_HOST, FCM_SEND_PATH, request);
+        })
+            .then(function (response) {
+            // The sendToDevice() and sendToDeviceGroup() methods both set the `to` query parameter in
+            // the underlying FCM request. If the provided notification key argument has an invalid
+            // format (that is, it is either a registration token or some random string), the response
+            // from the FCM server will default to a devices response (which we detect by looking for
+            // the `multicast_id` property). If that is the case, we either throw an error saying the
+            // provided notification key is invalid (if the message failed to send) or map the response
+            // to a MessagingDevicesResponse (if the message succeeded).
+            // See b/35394951 for more context.
+            if ('multicast_id' in response) {
+                if (response.success === 0) {
+                    throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_RECIPIENT, 'Notification key provided to sendToDeviceGroup() is invalid.');
+                }
+                else {
+                    return mapRawResponseToDevicesResponse(response);
+                }
+            }
+            return mapRawResponseToDeviceGroupResponse(response);
+        });
+    };
+    /**
+     * Sends an FCM message to a topic.
+     *
+     * @param {string} topic The name of the topic to which to send the message.
+     * @param {MessagingPayload} payload The message payload.
+     * @param {MessagingOptions} [options = {}] Optional options to alter the message.
+     *
+     * @return {Promise<MessagingTopicResponse>} A Promise fulfilled with the server's response after
+     *     the message has been sent.
+     */
+    Messaging.prototype.sendToTopic = function (topic, payload, options) {
+        var _this = this;
+        if (options === void 0) { options = {}; }
+        // Validate the input argument types. Since these are common developer errors when getting
+        // started, throw an error instead of returning a rejected promise.
+        this.validateTopicType(topic, 'sendToTopic', error_1.MessagingClientErrorCode.INVALID_RECIPIENT);
+        this.validateMessagingPayloadAndOptionsTypes(payload, options);
+        // Prepend the topic with /topics/ if necessary.
+        topic = this.normalizeTopic(topic);
+        return Promise.resolve()
+            .then(function () {
+            // Validate the contents of the payload and options objects. Because we are now in a
+            // promise, any thrown error will cause this method to return a rejected promise.
+            var payloadCopy = _this.validateMessagingPayload(payload);
+            var optionsCopy = _this.validateMessagingOptions(options);
+            _this.validateTopic(topic, 'sendToTopic', error_1.MessagingClientErrorCode.INVALID_RECIPIENT);
+            var request = deep_copy_1.deepCopy(payloadCopy);
+            deep_copy_1.deepExtend(request, optionsCopy);
+            request.to = topic;
+            return _this.messagingRequestHandler.invokeRequestHandler(FCM_SEND_HOST, FCM_SEND_PATH, request);
+        })
+            .then(function (response) {
+            // Rename properties on the server response
+            utils.renameProperties(response, MESSAGING_TOPIC_RESPONSE_KEYS_MAP);
+            return response;
+        });
+    };
+    /**
+     * Sends an FCM message to a condition.
+     *
+     * @param {string} condition The condition to which to send the message.
+     * @param {MessagingPayload} payload The message payload.
+     * @param {MessagingOptions} [options = {}] Optional options to alter the message.
+     *
+     * @return {Promise<MessagingConditionResponse>} A Promise fulfilled with the server's response
+     *     after the message has been sent.
+     */
+    Messaging.prototype.sendToCondition = function (condition, payload, options) {
+        var _this = this;
+        if (options === void 0) { options = {}; }
+        if (!validator.isNonEmptyString(condition)) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_RECIPIENT, 'Condition provided to sendToCondition() must be a non-empty string.');
+        }
+        // Validate the types of the payload and options arguments. Since these are common developer
+        // errors, throw an error instead of returning a rejected promise.
+        this.validateMessagingPayloadAndOptionsTypes(payload, options);
+        // The FCM server rejects conditions which are surrounded in single quotes. When the condition
+        // is stringified over the wire, double quotes in it get converted to \" which the FCM server
+        // does not properly handle. We can get around this by replacing internal double quotes with
+        // single quotes.
+        condition = condition.replace(/"/g, '\'');
+        return Promise.resolve()
+            .then(function () {
+            // Validate the contents of the payload and options objects. Because we are now in a
+            // promise, any thrown error will cause this method to return a rejected promise.
+            var payloadCopy = _this.validateMessagingPayload(payload);
+            var optionsCopy = _this.validateMessagingOptions(options);
+            var request = deep_copy_1.deepCopy(payloadCopy);
+            deep_copy_1.deepExtend(request, optionsCopy);
+            request.condition = condition;
+            return _this.messagingRequestHandler.invokeRequestHandler(FCM_SEND_HOST, FCM_SEND_PATH, request);
+        })
+            .then(function (response) {
+            // Rename properties on the server response
+            utils.renameProperties(response, MESSAGING_CONDITION_RESPONSE_KEYS_MAP);
+            return response;
+        });
+    };
+    /**
+     * Subscribes a single device or an array of devices to a topic.
+     *
+     * @param {string|string[]} registrationTokenOrTokens The registration token or an array of
+     *     registration tokens to subscribe to the topic.
+     * @param {string} topic The topic to which to subscribe.
+     *
+     * @return {Promise<MessagingTopicManagementResponse>} A Promise fulfilled with the parsed FCM
+     *   server response.
+     */
+    Messaging.prototype.subscribeToTopic = function (registrationTokenOrTokens, topic) {
+        return this.sendTopicManagementRequest(registrationTokenOrTokens, topic, 'subscribeToTopic', FCM_TOPIC_MANAGEMENT_ADD_PATH);
+    };
+    /**
+     * Unsubscribes a single device or an array of devices from a topic.
+     *
+     * @param {string|string[]} registrationTokenOrTokens The registration token or an array of
+     *     registration tokens to unsubscribe from the topic.
+     * @param {string} topic The topic to which to subscribe.
+     *
+     * @return {Promise<MessagingTopicManagementResponse>} A Promise fulfilled with the parsed FCM
+     *   server response.
+     */
+    Messaging.prototype.unsubscribeFromTopic = function (registrationTokenOrTokens, topic) {
+        return this.sendTopicManagementRequest(registrationTokenOrTokens, topic, 'unsubscribeFromTopic', FCM_TOPIC_MANAGEMENT_REMOVE_PATH);
+    };
+    /**
+     * Helper method which sends and handles topic subscription management requests.
+     *
+     * @param {string|string[]} registrationTokenOrTokens The registration token or an array of
+     *     registration tokens to unsubscribe from the topic.
+     * @param {string} topic The topic to which to subscribe.
+     * @param {string} methodName The name of the original method called.
+     * @param {string} path The endpoint path to use for the request.
+     *
+     * @return {Promise<MessagingTopicManagementResponse>} A Promise fulfilled with the parsed server
+     *   response.
+     */
+    Messaging.prototype.sendTopicManagementRequest = function (registrationTokenOrTokens, topic, methodName, path) {
+        var _this = this;
+        this.validateRegistrationTokensType(registrationTokenOrTokens, methodName);
+        this.validateTopicType(topic, methodName);
+        // Prepend the topic with /topics/ if necessary.
+        topic = this.normalizeTopic(topic);
+        return Promise.resolve()
+            .then(function () {
+            // Validate the contents of the input arguments. Because we are now in a promise, any thrown
+            // error will cause this method to return a rejected promise.
+            _this.validateRegistrationTokens(registrationTokenOrTokens, methodName);
+            _this.validateTopic(topic, methodName);
+            // Ensure the registration token(s) input argument is an array.
+            var registrationTokensArray = registrationTokenOrTokens;
+            if (validator.isString(registrationTokenOrTokens)) {
+                registrationTokensArray = [registrationTokenOrTokens];
+            }
+            var request = {
+                to: topic,
+                registration_tokens: registrationTokensArray,
+            };
+            return _this.messagingRequestHandler.invokeRequestHandler(FCM_TOPIC_MANAGEMENT_HOST, path, request);
+        })
+            .then(function (response) {
+            return mapRawResponseToTopicManagementResponse(response);
+        });
+    };
+    /**
+     * Validates the types of the messaging payload and options. If invalid, an error will be thrown.
+     *
+     * @param {MessagingPayload} payload The messaging payload to validate.
+     * @param {MessagingOptions} options The messaging options to validate.
+     */
+    Messaging.prototype.validateMessagingPayloadAndOptionsTypes = function (payload, options) {
+        // Validate the payload is an object
+        if (!validator.isNonNullObject(payload)) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'Messaging payload must be an object with at least one of the "data" or "notification" properties.');
+        }
+        // Validate the options argument is an object
+        if (!validator.isNonNullObject(options)) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, 'Messaging options must be an object.');
+        }
+    };
+    /**
+     * Validates the messaging payload. If invalid, an error will be thrown.
+     *
+     * @param {MessagingPayload} payload The messaging payload to validate.
+     *
+     * @return {MessagingPayload} A copy of the provided payload with whitelisted properties switched
+     *     from camelCase to underscore_case.
+     */
+    Messaging.prototype.validateMessagingPayload = function (payload) {
+        var payloadCopy = deep_copy_1.deepCopy(payload);
+        var payloadKeys = Object.keys(payloadCopy);
+        var validPayloadKeys = ['data', 'notification'];
+        var containsDataOrNotificationKey = false;
+        payloadKeys.forEach(function (payloadKey) {
+            // Validate the payload does not contain any invalid keys
+            if (validPayloadKeys.indexOf(payloadKey) === -1) {
+                throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, "Messaging payload contains an invalid \"" + payloadKey + "\" property. Valid properties are " +
+                    "\"data\" and \"notification\".");
+            }
+            else {
+                containsDataOrNotificationKey = true;
+            }
+        });
+        // Validate the payload contains at least one of the "data" and "notification" keys
+        if (!containsDataOrNotificationKey) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, 'Messaging payload must contain at least one of the "data" or "notification" properties.');
+        }
+        payloadKeys.forEach(function (payloadKey) {
+            var value = payloadCopy[payloadKey];
+            // Validate each top-level key in the payload is an object
+            if (!validator.isNonNullObject(value)) {
+                throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, "Messaging payload contains an invalid value for the \"" + payloadKey + "\" property. " +
+                    "Value must be an object.");
+            }
+            Object.keys(value).forEach(function (subKey) {
+                if (!validator.isString(value[subKey])) {
+                    // Validate all sub-keys have a string value
+                    throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, "Messaging payload contains an invalid value for the \"" + payloadKey + "." + subKey + "\" " +
+                        "property. Values must be strings.");
+                }
+                else if (payloadKey === 'data' && /^google\./.test(subKey)) {
+                    // Validate the data payload does not contain keys which start with 'google.'.
+                    throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, "Messaging payload contains the blacklisted \"data." + subKey + "\" property.");
+                }
+            });
+        });
+        // Validate the data payload object does not contain blacklisted properties
+        if ('data' in payloadCopy) {
+            exports.BLACKLISTED_DATA_PAYLOAD_KEYS.forEach(function (blacklistedKey) {
+                if (blacklistedKey in payloadCopy.data) {
+                    throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_PAYLOAD, "Messaging payload contains the blacklisted \"data." + blacklistedKey + "\" property.");
+                }
+            });
+        }
+        // Convert whitelisted camelCase keys to underscore_case
+        if ('notification' in payloadCopy) {
+            utils.renameProperties(payloadCopy.notification, CAMELCASED_NOTIFICATION_PAYLOAD_KEYS_MAP);
+        }
+        return payloadCopy;
+    };
+    /**
+     * Validates the messaging options. If invalid, an error will be thrown.
+     *
+     * @param {MessagingOptions} options The messaging options to validate.
+     *
+     * @return {MessagingOptions} A copy of the provided options with whitelisted properties switched
+     *   from camelCase to underscore_case.
+     */
+    Messaging.prototype.validateMessagingOptions = function (options) {
+        var optionsCopy = deep_copy_1.deepCopy(options);
+        // Validate the options object does not contain blacklisted properties
+        exports.BLACKLISTED_OPTIONS_KEYS.forEach(function (blacklistedKey) {
+            if (blacklistedKey in optionsCopy) {
+                throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, "Messaging options contains the blacklisted \"" + blacklistedKey + "\" property.");
+            }
+        });
+        // Convert whitelisted camelCase keys to underscore_case
+        utils.renameProperties(optionsCopy, CAMELCASE_OPTIONS_KEYS_MAP);
+        // Validate the options object contains valid values for whitelisted properties
+        if ('collapse_key' in optionsCopy && !validator.isNonEmptyString(optionsCopy.collapse_key)) {
+            var keyName = ('collapseKey' in options) ? 'collapseKey' : 'collapse_key';
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, "Messaging options contains an invalid value for the \"" + keyName + "\" property. Value must " +
+                'be a non-empty string.');
+        }
+        else if ('dry_run' in optionsCopy && !validator.isBoolean(optionsCopy.dry_run)) {
+            var keyName = ('dryRun' in options) ? 'dryRun' : 'dry_run';
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, "Messaging options contains an invalid value for the \"" + keyName + "\" property. Value must " +
+                'be a boolean.');
+        }
+        else if ('priority' in optionsCopy && !validator.isNonEmptyString(optionsCopy.priority)) {
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, 'Messaging options contains an invalid value for the "priority" property. Value must ' +
+                'be a non-empty string.');
+        }
+        else if ('restricted_package_name' in optionsCopy &&
+            !validator.isNonEmptyString(optionsCopy.restricted_package_name)) {
+            var keyName = ('restrictedPackageName' in options) ? 'restrictedPackageName' : 'restricted_package_name';
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, "Messaging options contains an invalid value for the \"" + keyName + "\" property. Value must " +
+                'be a non-empty string.');
+        }
+        else if ('time_to_live' in optionsCopy && !validator.isNumber(optionsCopy.time_to_live)) {
+            var keyName = ('timeToLive' in options) ? 'timeToLive' : 'time_to_live';
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, "Messaging options contains an invalid value for the \"" + keyName + "\" property. Value must " +
+                'be a number.');
+        }
+        else if ('content_available' in optionsCopy && !validator.isBoolean(optionsCopy.content_available)) {
+            var keyName = ('contentAvailable' in options) ? 'contentAvailable' : 'content_available';
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, "Messaging options contains an invalid value for the \"" + keyName + "\" property. Value must " +
+                'be a boolean.');
+        }
+        else if ('mutable_content' in optionsCopy && !validator.isBoolean(optionsCopy.mutable_content)) {
+            var keyName = ('mutableContent' in options) ? 'mutableContent' : 'mutable_content';
+            throw new error_1.FirebaseMessagingError(error_1.MessagingClientErrorCode.INVALID_OPTIONS, "Messaging options contains an invalid value for the \"" + keyName + "\" property. Value must " +
+                'be a boolean.');
+        }
+        return optionsCopy;
+    };
+    /**
+     * Validates the type of the provided registration token(s). If invalid, an error will be thrown.
+     *
+     * @param {string|string[]} registrationTokenOrTokens The registration token(s) to validate.
+     * @param {string} method The method name to use in error messages.
+     * @param {ErrorInfo?} [errorInfo] The error info to use if the registration tokens are invalid.
+     */
+    Messaging.prototype.validateRegistrationTokensType = function (registrationTokenOrTokens, methodName, errorInfo) {
+        if (errorInfo === void 0) { errorInfo = error_1.MessagingClientErrorCode.INVALID_ARGUMENT; }
+        if (!validator.isNonEmptyArray(registrationTokenOrTokens) &&
+            !validator.isNonEmptyString(registrationTokenOrTokens)) {
+            throw new error_1.FirebaseMessagingError(errorInfo, "Registration token(s) provided to " + methodName + "() must be a non-empty string or a " +
+                'non-empty array.');
+        }
+    };
+    /**
+     * Validates the provided registration tokens. If invalid, an error will be thrown.
+     *
+     * @param {string|string[]} registrationTokenOrTokens The registration token or an array of
+     *     registration tokens to validate.
+     * @param {string} method The method name to use in error messages.
+     * @param {errorInfo?} [ErrorInfo] The error info to use if the registration tokens are invalid.
+     */
+    Messaging.prototype.validateRegistrationTokens = function (registrationTokenOrTokens, methodName, errorInfo) {
+        if (errorInfo === void 0) { errorInfo = error_1.MessagingClientErrorCode.INVALID_ARGUMENT; }
+        if (validator.isArray(registrationTokenOrTokens)) {
+            // Validate the array contains no more than 1,000 registration tokens.
+            if (registrationTokenOrTokens.length > 1000) {
+                throw new error_1.FirebaseMessagingError(errorInfo, "Too many registration tokens provided in a single request to " + methodName + "(). Batch " +
+                    'your requests to contain no more than 1,000 registration tokens per request.');
+            }
+            // Validate the array contains registration tokens which are non-empty strings.
+            registrationTokenOrTokens.forEach(function (registrationToken, index) {
+                if (!validator.isNonEmptyString(registrationToken)) {
+                    throw new error_1.FirebaseMessagingError(errorInfo, "Registration token provided to " + methodName + "() at index " + index + " must be a " +
+                        'non-empty string.');
+                }
+            });
+        }
+    };
+    /**
+     * Validates the type of the provided topic. If invalid, an error will be thrown.
+     *
+     * @param {string} topic The topic to validate.
+     * @param {string} method The method name to use in error messages.
+     * @param {ErrorInfo?} [errorInfo] The error info to use if the topic is invalid.
+     */
+    Messaging.prototype.validateTopicType = function (topic, methodName, errorInfo) {
+        if (errorInfo === void 0) { errorInfo = error_1.MessagingClientErrorCode.INVALID_ARGUMENT; }
+        if (!validator.isNonEmptyString(topic)) {
+            throw new error_1.FirebaseMessagingError(errorInfo, "Topic provided to " + methodName + "() must be a string which matches the format " +
+                '"/topics/[a-zA-Z0-9-_.~%]+".');
+        }
+    };
+    /**
+     * Validates the provided topic. If invalid, an error will be thrown.
+     *
+     * @param {string} topic The topic to validate.
+     * @param {string} method The method name to use in error messages.
+     * @param {ErrorInfo?} [errorInfo] The error info to use if the topic is invalid.
+     */
+    Messaging.prototype.validateTopic = function (topic, methodName, errorInfo) {
+        if (errorInfo === void 0) { errorInfo = error_1.MessagingClientErrorCode.INVALID_ARGUMENT; }
+        if (!validator.isTopic(topic)) {
+            throw new error_1.FirebaseMessagingError(errorInfo, "Topic provided to " + methodName + "() must be a string which matches the format " +
+                '"/topics/[a-zA-Z0-9-_.~%]+".');
+        }
+    };
+    /**
+     * Normalizes the provided topic name by prepending it with '/topics/', if necessary.
+     *
+     * @param {string} topic The topic name to normalize.
+     *
+     * @return {string} The normalized topic name.
+     */
+    Messaging.prototype.normalizeTopic = function (topic) {
+        if (!/^\/topics\//.test(topic)) {
+            topic = "/topics/" + topic;
+        }
+        return topic;
+    };
+    return Messaging;
+}());
+exports.Messaging = Messaging;