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website/node_modules/firebase-functions/lib/cloud-functions.js

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+"use strict";
+// The MIT License (MIT)
+//
+// Copyright (c) 2017 Firebase
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+Object.defineProperty(exports, "__esModule", { value: true });
+const _ = require("lodash");
+const WILDCARD_REGEX = new RegExp('{[^/{}]*}', 'g');
+/** Change describes a change of state - "before" represents the state prior
+ * to the event, "after" represents the state after the event.
+ */
+class Change {
+    constructor(before, after) {
+        this.before = before;
+        this.after = after;
+    }
+}
+exports.Change = Change;
+(function (Change) {
+    function reinterpretCast(x) {
+        return x;
+    }
+    /** Factory method for creating a Change from a `before` object and an `after` object. */
+    function fromObjects(before, after) {
+        return new Change(before, after);
+    }
+    Change.fromObjects = fromObjects;
+    /** Factory method for creating a Change from a JSON and an optional customizer function to be
+     * applied to both the `before` and the `after` fields.
+     */
+    function fromJSON(json, customizer = reinterpretCast) {
+        let before = _.assign({}, json.before);
+        if (json.fieldMask) {
+            before = applyFieldMask(before, json.after, json.fieldMask);
+        }
+        return Change.fromObjects(customizer(before || {}), customizer(json.after || {}));
+    }
+    Change.fromJSON = fromJSON;
+    /** @internal */
+    function applyFieldMask(sparseBefore, after, fieldMask) {
+        let before = _.assign({}, after);
+        let masks = fieldMask.split(',');
+        _.forEach(masks, mask => {
+            const val = _.get(sparseBefore, mask);
+            if (typeof val === 'undefined') {
+                _.unset(before, mask);
+            }
+            else {
+                _.set(before, mask, val);
+            }
+        });
+        return before;
+    }
+    Change.applyFieldMask = applyFieldMask;
+})(Change = exports.Change || (exports.Change = {}));
+/** @internal */
+function makeCloudFunction({ provider, eventType, triggerResource, service, dataConstructor = (raw) => raw.data, handler, before = () => {
+    return;
+}, after = () => {
+    return;
+}, legacyEventType, opts = {}, }) {
+    let cloudFunction;
+    let cloudFunctionNewSignature = (data, context) => {
+        if (legacyEventType && context.eventType === legacyEventType) {
+            // v1beta1 event flow has different format for context, transform them to new format.
+            context.eventType = provider + '.' + eventType;
+            context.resource = {
+                service: service,
+                name: context.resource,
+            };
+        }
+        let event = {
+            data,
+            context,
+        };
+        if (provider === 'google.firebase.database') {
+            context.authType = _detectAuthType(event);
+            if (context.authType !== 'ADMIN') {
+                context.auth = _makeAuth(event, context.authType);
+            }
+            else {
+                delete context.auth;
+            }
+        }
+        context.params = context.params || _makeParams(context, triggerResource);
+        before(event);
+        let dataOrChange = dataConstructor(event);
+        let promise = handler(dataOrChange, context);
+        if (typeof promise === 'undefined') {
+            console.warn('Function returned undefined, expected Promise or value');
+        }
+        return Promise.resolve(promise)
+            .then(result => {
+            after(event);
+            return result;
+        })
+            .catch(err => {
+            after(event);
+            return Promise.reject(err);
+        });
+    };
+    if (process.env.X_GOOGLE_NEW_FUNCTION_SIGNATURE === 'true') {
+        cloudFunction = cloudFunctionNewSignature;
+    }
+    else {
+        cloudFunction = (raw) => {
+            let context;
+            // In Node 6 runtime, function called with single event param
+            let data = _.get(raw, 'data');
+            if (isEvent(raw)) {
+                // new eventflow v1beta2 format
+                context = _.cloneDeep(raw.context);
+            }
+            else {
+                // eventflow v1beta1 format
+                context = _.omit(raw, 'data');
+            }
+            return cloudFunctionNewSignature(data, context);
+        };
+    }
+    Object.defineProperty(cloudFunction, '__trigger', {
+        get: () => {
+            let trigger = _.assign(optsToTrigger(opts), {
+                eventTrigger: {
+                    resource: triggerResource(),
+                    eventType: legacyEventType || provider + '.' + eventType,
+                    service,
+                },
+            });
+            return trigger;
+        },
+    });
+    cloudFunction.run = handler;
+    return cloudFunction;
+}
+exports.makeCloudFunction = makeCloudFunction;
+function isEvent(event) {
+    return _.has(event, 'context');
+}
+function _makeParams(context, triggerResourceGetter) {
+    if (context.params) {
+        // In unit testing, user may directly provide `context.params`.
+        return context.params;
+    }
+    if (!context.resource) {
+        // In unit testing, `resource` may be unpopulated for a test event.
+        return {};
+    }
+    let triggerResource = triggerResourceGetter();
+    let wildcards = triggerResource.match(WILDCARD_REGEX);
+    let params = {};
+    if (wildcards) {
+        let triggerResourceParts = _.split(triggerResource, '/');
+        let eventResourceParts = _.split(context.resource.name, '/');
+        _.forEach(wildcards, wildcard => {
+            let wildcardNoBraces = wildcard.slice(1, -1);
+            let position = _.indexOf(triggerResourceParts, wildcard);
+            params[wildcardNoBraces] = eventResourceParts[position];
+        });
+    }
+    return params;
+}
+function _makeAuth(event, authType) {
+    if (authType === 'UNAUTHENTICATED') {
+        return null;
+    }
+    return {
+        uid: _.get(event, 'context.auth.variable.uid'),
+        token: _.get(event, 'context.auth.variable.token'),
+    };
+}
+function _detectAuthType(event) {
+    if (_.get(event, 'context.auth.admin')) {
+        return 'ADMIN';
+    }
+    if (_.has(event, 'context.auth.variable')) {
+        return 'USER';
+    }
+    return 'UNAUTHENTICATED';
+}
+function optsToTrigger(opts) {
+    let trigger = {};
+    if (opts.regions) {
+        trigger.regions = opts.regions;
+    }
+    if (opts.timeoutSeconds) {
+        trigger.timeout = opts.timeoutSeconds.toString() + 's';
+    }
+    if (opts.memory) {
+        const memoryLookup = {
+            '128MB': 128,
+            '256MB': 256,
+            '512MB': 512,
+            '1GB': 1024,
+            '2GB': 2048,
+        };
+        trigger.availableMemoryMb = _.get(memoryLookup, opts.memory);
+    }
+    return trigger;
+}
+exports.optsToTrigger = optsToTrigger;