Lesson 18

.firebaserc

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+{
+  "projects": {
+    "default": "tutorial-requests-files"
+  }
+}

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+firebase-debug.log*
+
+# Firebase cache
+.firebase/
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env

firebase.json

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+{
+  "firestore": {
+    "rules": "firestore.rules",
+    "indexes": "firestore.indexes.json"
+  },
+  "functions": {
+    "predeploy": [
+      "npm --prefix \"$RESOURCE_DIR\" run lint"
+    ]
+  },
+  "hosting": {
+    "public": "public",
+    "ignore": [
+      "firebase.json",
+      "**/.*",
+      "**/node_modules/**"
+    ]
+  }
+}

firestore.indexes.json

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+{
+  "indexes": [],
+  "fieldOverrides": []
+}

firestore.rules

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+rules_version = '2';
+service cloud.firestore {
+  match /databases/{database}/documents {
+    match /{document=**} {
+      allow read, write: if false;
+    }
+  }
+}

functions/.eslintrc.json

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+{
+  "parserOptions": {
+    // Required for certain syntax usages
+    "ecmaVersion": 2017
+  },
+  "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
+  }
+}

functions/.gitignore

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+node_modules/

functions/index.js

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+const functions = require('firebase-functions');
+const admin = require('firebase-admin');
+admin.initializeApp();
+
+// auth trigger (new user signup)
+exports.newUserSignUp = functions.auth.user().onCreate(user => {
+  // for background triggers you must return a value/promise
+  return admin.firestore().collection('users').doc(user.uid).set({
+    email: user.email,
+    upvotedOn: [],
+  });
+});
+
+// auth trigger (user deleted)
+exports.userDeleted = functions.auth.user().onDelete(user => {
+  const doc = admin.firestore().collection('users').doc(user.uid);
+  return doc.delete();
+});
+
+// http callable function (adding a request)
+exports.addRequest = functions.https.onCall((data, context) => {
+  if (!context.auth) {
+    throw new functions.https.HttpsError(
+      'unauthenticated', 
+      'only authenticated users can add requests'
+    );
+  }
+  if (data.text.length > 30) {
+    throw new functions.https.HttpsError(
+      'invalid-argument', 
+      'request must be no more than 30 characters long'
+    );
+  }
+  return admin.firestore().collection('requests').add({
+    text: data.text,
+    upvotes: 0
+  });
+});
+
+// // upvote callable function
+exports.upvote = functions.https.onCall(async (data, context) => {
+  // check auth state
+  if (!context.auth) {
+    throw new functions.https.HttpsError(
+      'unauthenticated', 
+      'only authenticated users can vote up requests'
+    );
+  }
+  // get refs for user doc & request doc
+  const user = admin.firestore().collection('users').doc(context.auth.uid);
+  const request = admin.firestore().collection('requests').doc(data.id);
+
+  const doc = await user.get();
+  // check thew user hasn't already upvoted
+  if(doc.data().upvotedOn.includes(data.id)){
+    throw new functions.https.HttpsError(
+      'failed-precondition', 
+      'You can only vote something up once'
+    );
+  }
+
+  // update the array in user document
+  await user.update({
+    upvotedOn: [...doc.data().upvotedOn, data.id]
+  });
+
+  // update the votes on the request
+  return request.update({
+    upvotes: admin.firestore.FieldValue.increment(1)
+  });
+
+});
+
+// firestore trigger for tracking activity
+exports.logActivities = functions.firestore.document('/{collection}/{id}')
+  .onCreate((snap, context) => {
+    console.log(snap.data());
+
+    const activities = admin.firestore().collection('activities');
+    const collection = context.params.collection;
+
+    if (collection === 'requests') {
+      return activities.add({ text: 'a new tutorial request was added' });
+    }
+    if (collection === 'users') {
+      return activities.add({ text: 'a new user signed up'});
+    }
+
+    return null;
+});