initial commit

Change-Id: I413138eae8dde71bbb7e110e011536c555490410

remote-config-diff/README.md

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+## Get the diff between the previous and current Remote Config templates.
+
+With the Firebase Remote Config Cloud Function trigger you can take action when
+your template has been updated.
+
+Here the diff between the previous and current templates is logged.

remote-config-diff/firebase.json

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+{
+  "functions": {
+    "predeploy": [
+      "npm --prefix \"$RESOURCE_DIR\" run lint"
+    ]
+  }
+}

remote-config-diff/functions/.eslintrc.json

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+{
+  "parserOptions": {
+    // Required for certain syntax usages
+    "ecmaVersion": 6
+  },
+  "plugins": [
+    "promise"
+  ],
+  "extends": "eslint:recommended",
+  "rules": {
+    // Removed rule "disallow the use of console" from recommended eslint rules
+    "no-console": "off",
+
+    // Removed rule "disallow multiple spaces in regular expressions" from recommended eslint rules
+    "no-regex-spaces": "off",
+
+    // Removed rule "disallow the use of debugger" from recommended eslint rules
+    "no-debugger": "off",
+
+    // Removed rule "disallow unused variables" from recommended eslint rules
+    "no-unused-vars": "off",
+
+    // Removed rule "disallow mixed spaces and tabs for indentation" from recommended eslint rules
+    "no-mixed-spaces-and-tabs": "off",
+
+    // Removed rule "disallow the use of undeclared variables unless mentioned in /*global */ comments" from recommended eslint rules
+    "no-undef": "off",
+
+    // Warn against template literal placeholder syntax in regular strings
+    "no-template-curly-in-string": 1,
+
+    // Warn if return statements do not either always or never specify values
+    "consistent-return": 1,
+
+    // Warn if no return statements in callbacks of array methods
+    "array-callback-return": 1,
+
+    // Require the use of === and !==
+    "eqeqeq": 2,
+
+    // Disallow the use of alert, confirm, and prompt
+    "no-alert": 2,
+
+    // Disallow the use of arguments.caller or arguments.callee
+    "no-caller": 2,
+
+    // Disallow null comparisons without type-checking operators
+    "no-eq-null": 2,
+
+    // Disallow the use of eval()
+    "no-eval": 2,
+
+    // Warn against extending native types
+    "no-extend-native": 1,
+
+    // Warn against unnecessary calls to .bind()
+    "no-extra-bind": 1,
+
+    // Warn against unnecessary labels    
+    "no-extra-label": 1,
+
+    // Disallow leading or trailing decimal points in numeric literals
+    "no-floating-decimal": 2,
+
+    // Warn against shorthand type conversions
+    "no-implicit-coercion": 1,
+
+    // Warn against function declarations and expressions inside loop statements
+    "no-loop-func": 1,
+
+    // Disallow new operators with the Function object
+    "no-new-func": 2,
+
+    // Warn against new operators with the String, Number, and Boolean objects
+    "no-new-wrappers": 1,
+
+    // Disallow throwing literals as exceptions
+    "no-throw-literal": 2,
+
+    // Require using Error objects as Promise rejection reasons
+    "prefer-promise-reject-errors": 2,
+
+    // Enforce “for” loop update clause moving the counter in the right direction
+    "for-direction": 2,
+
+    // Enforce return statements in getters
+    "getter-return": 2,
+
+    // Disallow await inside of loops
+    "no-await-in-loop": 2,
+
+    // Disallow comparing against -0
+    "no-compare-neg-zero": 2,
+
+    // Warn against catch clause parameters from shadowing variables in the outer scope
+    "no-catch-shadow": 1,
+
+    // Disallow identifiers from shadowing restricted names
+    "no-shadow-restricted-names": 2,
+
+    // Enforce return statements in callbacks of array methods
+    "callback-return": 2,
+
+    // Require error handling in callbacks
+    "handle-callback-err": 2,
+
+    // Warn against string concatenation with __dirname and __filename
+    "no-path-concat": 1,
+
+    // Prefer using arrow functions for callbacks
+    "prefer-arrow-callback": 1,
+
+    // Return inside each then() to create readable and reusable Promise chains.
+    // Forces developers to return console logs and http calls in promises. 
+    "promise/always-return": 2,
+
+    //Enforces the use of catch() on un-returned promises
+    "promise/catch-or-return": 2,
+
+    // Warn against nested then() or catch() statements
+    "promise/no-nesting": 1
+  }
+}

remote-config-diff/functions/index.js

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+const functions = require('firebase-functions');
+const admin = require('firebase-admin');
+const rp = require('request-promise');
+const jsonDiff = require('json-diff');
+
+admin.initializeApp();
+
+exports.showConfigDiff = functions.remoteConfig.onUpdate(versionMetadata => {
+  return admin.credential.applicationDefault().getAccessToken()
+    .then(accessTokenObj => {
+      return accessTokenObj.access_token;
+    })
+    .then(accessToken => {
+      const currentVersion = versionMetadata.versionNumber;
+      const templatePromises = [];
+      templatePromises.push(getTemplate(currentVersion, accessToken));
+      templatePromises.push(getTemplate(currentVersion - 1, accessToken));
+
+      return Promise.all(templatePromises);
+    })
+    .then(results => {
+      const currentTemplate = results[0];
+      const previousTemplate = results[1];
+
+      const diff = jsonDiff.diffString(previousTemplate, currentTemplate);
+
+      console.log(diff);
+
+      return null;
+    }).catch(error => {
+      console.error(error);
+      return null;
+    });
+});
+
+function getTemplate(version, accessToken) {
+  const options = {
+    uri: 'https://firebaseremoteconfig.googleapis.com/v1/projects/remote-config-function/remoteConfig',
+    qs: {
+      versionNumber: version
+    },
+    headers: {
+        Authorization: 'Bearer ' + accessToken
+    },
+    json: true // Automatically parses the JSON string in the response
+  };
+  return rp(options).then(resp => {
+    return Promise.resolve(resp);
+  }).catch(err => {
+    console.error(err);
+    return Promise.resolve(null);
+  });
+}

remote-config-diff/functions/package.json

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+{
+  "name": "functions",
+  "description": "Cloud Functions for Firebase",
+  "scripts": {
+    "lint": "eslint .",
+    "serve": "firebase serve --only functions",
+    "shell": "firebase functions:shell",
+    "start": "npm run shell",
+    "deploy": "firebase deploy --only functions",
+    "logs": "firebase functions:log"
+  },
+  "dependencies": {
+    "firebase-admin": "~6.0.0",
+    "firebase-functions": "file:firebase-functions-2.0.5-remoteconfig.tgz",
+    "json-diff": "latest",
+    "request": "latest",
+    "request-promise": "latest"
+  },
+  "devDependencies": {
+    "eslint": "^4.12.0",
+    "eslint-plugin-promise": "^3.6.0"
+  },
+  "private": true
+}