TechuBank commons

Set of facilities used by the different TechuBank's components.

• Environments
• Logger traces
• Generic Http Request Handler
• Mongoose utils to interact with a MongoDB
• Security checks
• Encrypt and decrypt string
• Enable CORS

Let's explain some of them.

(#environments)

Environments

Common environment variables shared by all the components depending the environment (dev, docker, kubernetes, local, prod) The environment value es loaded from the environmente variable ENV.

How to use it The way to use for loading other settings is loading the environment variable ENV:

$ ENV=docker npm run start

In your javascript file:

const { environment } = require('techubank-commons')

console.log(environment.value)

It returns:

environment = {
            production: false,
            branch: 'develop',
            enableCors: true,
            protocol: 'http',
            techubank_api_url: 'http://localhost:3000',
            techubank_mlab_url: 'http://localhost:5000',
            techubank_auth_server_url: 'http://localhost:4000'
        }

(#logger)

Logger

Logger utils with the library Winston.

Settings are hardcoded right know.

// fetch de logger
    { logger } = require('techubank-commons')

// and use it
    logger.info(`App listening HTTPS on port ${port_ssl}`)

(#http_request_handler)

Generic Http Request Handler

It tries to manage in a generic way any http response depending the response statusCode.

Handlers object

  	{
 	success_handler: methodName_success_handler,            // statusCode = 200
 	error_handler: methodName_error_handler,                // statusCode = 400
 	unauthorized_handler: methodName_unauthorized_handler,    // statusCode = 401
 	forbidden_handler: methodName_forbidden_handler,        // statusCode = 403
 	server_error_handler: methodName_server_error_handler   // statusCode = 500
  }

How to use it

 { http_request_handler } = require('techubank-commons')

...
    return this.client.put('/v1/user/resetPassword', user, function (err_put_mlab, res_put_mlab) {
        return http_request_handler(err_put_mlab, res_put_mlab, {
            success_handler: _resetPassword_success_handler,
            error_handler: _resetPassword_error_handler
        }, res)
    })
    
....

function _resetPassword_success_handler(err, res, callback) {
    return callback.send('Password reset')
}

function _resetPassword_error_handler(err, res, callback) {
    return callback.send('ERROR reseting password!!!! ')
}

(#mongooseUtils)

Mongoose utils to interact with a MongoDB

Minimum set of enough functions for storing a Mongoose Model into a MongoDB Database.

Operatives:

• Find one element
• Find all results given a filter
• Find one element and update it
• Create one element
• Delete one element

// import the utils
const {
	mongooseUtils
} = require('techubank-commons'),

...

// import a Mongoose Model
	{
		user
	} = require('../models/user'),

...

// use it
    const filter = {
        $or: [{
            username: req.body['client_id']
        }, {
            email: req.body['client_id']
        }, {
            nif: req.body['client_id']
        }]
    }
    
	mongooseUtils.findOne(user, filter).then((user_found) => {
			if (crypt.checkpassword(req.body['client_secret'], user_found.password)) {
				const new_token = new token()

				new_token.access_token = crypt.hash('YOU ARE GRANTED TO ACCESS THE API!!!!')
	....

Schema example

const mongoose = require('mongoose')
	Schema = mongoose.Schema,
	{AddressSchema} = require('./address'),
	UserSchema = new Schema({
		username: {
			type: String,
			required: true
		},
		name: {
			type: String,
			required: true
		},		
		first_name: {
			type: String,
			required: true
		},
		last_name: {
			type: String
		}
	})

UserSchema.index({
	username: 1
}, {
	unique: true
}) 

module.exports.UserSchema = UserSchema
module.exports.user = mongoose.model('user', UserSchema)

(#security_checks) # Security checks

This utility fetchs a valid token for BOT users and communicate with the auth server to request information about a given token.

Development

Requirements

This project needs:

• Nodejs 8.4+

Folders

• bin: helpers
  • pre-commit: execute linter and unit tests before a commit
• src: The logic
• test: unit tests folder

Compilation

Stay on the base path where package.json is located.

techu@techu> npm install

Static code analysis

Linter

Linter is a light weight static code analysis recomended to be execute in every push to a branch, and may block the push.

techu@techu> npm run lint

Sonarqube - sonar-scanner Docker image

We have prepared a container with the software enough for run a static code analysis, execute unit tests, measure unit test coverage and upload the results to Sonarqube (free account).

You must have a Sonarqube API Key, configure properly the sonar-scanner.properties and run the command below:

$ docker run -it --env SONAR_API_KEY=<SONAR_USER_API_KEY> --mount type=bind,source="$(pwd)",target=/root/project -v "$(pwd)"/sonar-scanner.properties:/root/sonar-scanner/conf/sonar-scanner.properties davidrova/sonar-scanner:latest

To see the result click on this link.

The evaluation period has expired and we cannot upload more executions.

Don't worry, you can still perform static code analysis, but following a couple of additional steps.

Sonarqube - sonar Docker image

1. Launch a sonarqube instance (admin / admin)

$ docker run -d -p 9000:9000 -p 9092:9092 sonarqube

2. Generate a new API-KEY

3. Download sonar-scanner in localhost or use sonar-scanner Docker image sonar-scanner documentation

4. Run unit tests and coverage

$ npm run test
$ npm run coverage

5. Run sonar-scanner; sonar-scanner loads sonar-project.properties file

$ SONAR_API_KEY=<SONAR_API_KEY> sonar-scanner

6. View the results in Sonarqube

Hooks

We encourage to enable the pre-commit hook. It will avoid commiting a change if linter or unit tests fail.

techu@techu> cp bin/pre-commit .git/hooks/pre-commit

Continuous integration

The project is managed in bitbucket.org and we have automated an ease pipeline with the following step rules:

• A commint into develop branch triggers:
  • build
  • Increases the patch version
  • Publish the artifact to npmrc registry
• A commit into master branch triggers:
  • build
  • lint
  • unit tests
  • Increases the minor version
  • Publish the artifact to npmrc registry

NOTE: It's neccessary to generate a new key pair. Follow these instructions