I want to create a project called files_manager using the tasks and tutorials given in the File Manager project below...:

Task-Tutorials:

This project is a summary of this back-end trimester: authentication, NodeJS, MongoDB, Redis, pagination and background processing.

The objective is to build a simple platform to upload and view files:

• User authentication via a token

• List all files

• Upload a new file

• Change permission of a file

• View a file

• Generate thumbnails for images

You will be guided step by step for building it, but you have some freedoms of implementation, split in more files etc… (utils folder will be your friend)

Of course, this kind of service already exists in the real life - it’s a learning purpose to assemble each piece and build a full product.

Enjoy!

Resources

Read or watch:

Node JS getting started Process API doc Express getting started Mocha documentation Nodemon documentation MongoDB Bull Image thumbnail Mime-Types Redis

Learning Objectives

At the end of this project, you are expected to be able to explain to anyone, without the help of Google:

• how to create an API with Express
• how to authenticate a user
• how to store data in MongoDB
• how to store temporary data in Redis
• how to setup and use a background worker

Requirements

• Allowed editors: vi, vim, emacs, Visual Studio Code
• All your files will be interpreted/compiled on Ubuntu 18.04 LTS using node (version 12.x.x)
• All your files should end with a new line
• A README.md file, at the root of the folder of the project, is mandatory
• Your code should use the js extension
• Your code will be verified against lint using ESLint

Provided Files

package.json

{
  "name": "files_manager",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "lint": "./node_modules/.bin/eslint",
    "check-lint": "lint [0-9]*.js",
    "start-server": "nodemon --exec babel-node --presets @babel/preset-env ./server.js",
    "start-worker": "nodemon --exec babel-node --presets @babel/preset-env ./worker.js",
    "dev": "nodemon --exec babel-node --presets @babel/preset-env",
    "test": "./node_modules/.bin/mocha --require @babel/register --exit"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bull": "^3.16.0",
    "chai-http": "^4.3.0",
    "express": "^4.17.1",
    "image-thumbnail": "^1.0.10",
    "mime-types": "^2.1.27",
    "mongodb": "^3.5.9",
    "redis": "^2.8.0",
    "sha1": "^1.1.1",
    "uuid": "^8.2.0"
  },
  "devDependencies": {
    "@babel/cli": "^7.8.0",
    "@babel/core": "^7.8.0",
    "@babel/node": "^7.8.0",
    "@babel/preset-env": "^7.8.2",
    "@babel/register": "^7.8.0",
    "chai": "^4.2.0",
    "chai-http": "^4.3.0",
    "mocha": "^6.2.2",
    "nodemon": "^2.0.2",
    "eslint": "^6.4.0",
    "eslint-config-airbnb-base": "^14.0.0",
    "eslint-plugin-import": "^2.18.2",
    "eslint-plugin-jest": "^22.17.0",
    "request": "^2.88.0",
    "sinon": "^7.5.0"
  }
}

.eslintrc.js

module.exports = {
    env: {
      browser: false,
      es6: true,
      jest: true,
    },
    extends: [
      'airbnb-base',
      'plugin:jest/all',
    ],
    globals: {
      Atomics: 'readonly',
      SharedArrayBuffer: 'readonly',
    },
    parserOptions: {
      ecmaVersion: 2018,
      sourceType: 'module',
    },
    plugins: ['jest'],
    rules: {
      'max-classes-per-file': 'off',
      'no-underscore-dangle': 'off',
      'no-console': 'off',
      'no-shadow': 'off',
      'no-restricted-syntax': [
        'error',
        'LabeledStatement',
        'WithStatement',
      ],
    },
    overrides:[
      {
        files: ['*.js'],
        excludedFiles: 'babel.config.js',
      }
    ]
};

babel.config.js

module.exports = {
    presets: [
      [
        '@babel/preset-env',
        {
          targets: {
            node: 'current',
          },
        },
      ],
    ],
};

-------------------> Can I provide the tasks?

Tasks

0. Redis utils

Inside the folder utils, create a file redis.js that contains the class RedisClient.

RedisClient should have:

• the constructor that creates a client to Redis:
  • any error of the redis client must be displayed in the console (you should use on('error') of the redis client)
• a function isAlive that returns true when the connection to Redis is a success otherwise, false
• an asynchronous function get that takes a string key as argument and returns the Redis value stored for this key
• an asynchronous function set that takes a string key, a value and a duration in second as arguments to store it in Redis (with an expiration set by the duration argument)
• an asynchronous function del that takes a string key as argument and remove the value in Redis for this key

After the class definition, create and export an instance of RedisClient called redisClient.

bob@dylan:~$ cat main.js
import redisClient from './utils/redis';

(async () => {
    console.log(redisClient.isAlive());
    console.log(await redisClient.get('myKey'));
    await redisClient.set('myKey', 12, 5);
    console.log(await redisClient.get('myKey'));

    setTimeout(async () => {
        console.log(await redisClient.get('myKey'));
    }, 1000*10)
})();

bob@dylan:~$ npm run dev main.js
true
null
12
null
bob@dylan:~$

Repo:

• GitHub repository: minter_test
• File: utils/redis.js

1. MongoDB utils

Inside the folder utils, create a file db.js that contains the class DBClient.

DBClient should have:

• the constructor that creates a client to MongoDB:
  • host: from the environment variable DB_HOST or default: localhost
  • port: from the environment variable DB_PORT or default: 27017
  • database: from the environment variable DB_DATABASE or default: files_manager
• a function isAlive that returns true when the connection to MongoDB is a success otherwise, false
• an asynchronous function nbUsers that returns the number of documents in the collection users
• an asynchronous function nbFiles that returns the number of documents in the collection files

After the class definition, create and export an instance of DBClient called dbClient``.

bob@dylan:~$ cat main.js
import dbClient from './utils/db';

const waitConnection = () => {
    return new Promise((resolve, reject) => {
        let i = 0;
        const repeatFct = async () => {
            await setTimeout(() => {
                i += 1;
                if (i >= 10) {
                    reject()
                }
                else if(!dbClient.isAlive()) {
                    repeatFct()
                }
                else {
                    resolve()
                }
            }, 1000);
        };
        repeatFct();
    })
};

(async () => {
    console.log(dbClient.isAlive());
    await waitConnection();
    console.log(dbClient.isAlive());
    console.log(await dbClient.nbUsers());
    console.log(await dbClient.nbFiles());
})();

bob@dylan:~$ npm run dev main.js
false
true
4
30
bob@dylan:~$

Repo:

• GitHub repository: alx-files_manager
• File: utils/db.js

2. First API

Inside server.js, create the Express server:

it should listen on the port set by the environment variable PORT or by default 5000 it should load all routes from the file routes/index.js Inside the folder routes, create a file index.js that contains all endpoints of our API:

GET /status => AppController.getStatus GET /stats => AppController.getStats Inside the folder controllers, create a file AppController.js that contains the definition of the 2 endpoints:

GET /status should return if Redis is alive and if the DB is alive too by using the 2 utils created previously: { "redis": true, "db": true } with a status code 200 GET /stats should return the number of users and files in DB: { "users": 12, "files": 1231 } with a status code 200 users collection must be used for counting all users files collection must be used for counting all files Terminal 1:

bob@dylan:~$ npm run start-server Server running on port 5000 ... Terminal 2:

bob@dylan:$ curl 0.0.0.0:5000/status ; echo "" {"redis":true,"db":true} bob@dylan:$ bob@dylan:$ curl 0.0.0.0:5000/stats ; echo "" {"users":4,"files":30} bob@dylan:$ Repo:

GitHub repository: alx-files_manager File: server.js, routes/index.js, controllers/AppController.js

3. Create a new user

Now that we have a simple API, it’s time to add users to our database.

In the file routes/index.js, add a new endpoint:

POST /users => UsersController.postNew Inside controllers, add a file UsersController.js that contains the new endpoint:

POST /users should create a new user in DB:

To create a user, you must specify an email and a password If the email is missing, return an error Missing email with a status code 400 If the password is missing, return an error Missing password with a status code 400 If the email already exists in DB, return an error Already exist with a status code 400 The password must be stored after being hashed in SHA1 The endpoint is returning the new user with only the email and the id (auto generated by MongoDB) with a status code 201 The new user must be saved in the collection users: email: same as the value received password: SHA1 value of the value received bob@dylan:$ curl 0.0.0.0:5000/users -XPOST -H "Content-Type: application/json" -d '{ "email": "bob@dylan.com", "password": "toto1234!" }' ; echo "" {"id":"5f1e7d35c7ba06511e683b21","email":"bob@dylan.com"} bob@dylan:$ bob@dylan:$ echo 'db.users.find()' | mongo files_manager { "_id" : ObjectId("5f1e7d35c7ba06511e683b21"), "email" : "bob@dylan.com", "password" : "89cad29e3ebc1035b29b1478a8e70854f25fa2b2" } bob@dylan:$ bob@dylan:$ bob@dylan:$ curl 0.0.0.0:5000/users -XPOST -H "Content-Type: application/json" -d '{ "email": "bob@dylan.com", "password": "toto1234!" }' ; echo "" {"error":"Already exist"} bob@dylan:$ bob@dylan:$ curl 0.0.0.0:5000/users -XPOST -H "Content-Type: application/json" -d '{ "email": "bob@dylan.com" }' ; echo "" {"error":"Missing password"} bob@dylan:~$ Repo:

GitHub repository: alx-files_manager File: utils/, routes/index.js, controllers/UsersController.js

4. Authenticate a user

5. First File

6. Get and list file

7. File publish/unpublish

8. File data

9. Image Thumbnails

10. Tests!

11. New user - welcome email

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