студентам: скрипт для подготовки БД

setup.js

const mongodb = require('mongodb')
const MongoClient = mongodb.MongoClient
const bcrypt = require('bcrypt')

const connectionString = process.env.DB_CONNECTION_STRING
const dbName = process.env.DB_DATABASE_NAME
const collectionName = process.env.DB_USERS_COLLECTION_NAME
const defaultUserName = process.env.DEFAULT_USER_NAME
const defaultUserPassword = process.env.DEFAULT_USER_PASSWORD
const saltRounds = Number(process.env.PASSWORD_SALT_ROUNDS)

// related doc: http://mongodb.github.io/node-mongodb-native/3.0/tutorials/connect/

function connectToDb() {
    return new Promise((resolve, reject) => {
        MongoClient.connect(connectionString, {
            useNewUrlParser: true
        }, (err, con) => {
            if (err) {
                reject(err)
            } else {
                resolve(con)
            }
        })
    })
}

function findDefaultUser(collection, defaultUserName) {
    return new Promise((resolve, reject) => {
        collection.findOne({
            name: defaultUserName
        }, (err, user) => {
            if (err) {
                reject(err)
            } else {
                resolve(user)
            }
        })
    })
}

function createDefaultUser(collection, defaultUserName, passwordHash) {
    return new Promise((resolve, reject) => {
        const defaultUser = {
            name: defaultUserName,
            passwordHash: passwordHash
        }
        collection.insert(defaultUser, (err) => {
            if(err) {
                reject(err)
            } else {
                resolve()
            }
        })
    })
}

async function setup() {
    const connection = await connectToDb()
    console.log('connection OK')
    const database = connection.db(dbName)
    const collection = database.collection(collectionName)
    const defaultUser = await findDefaultUser(collection, defaultUserName)
    if (!defaultUser) {
        const passwordHash = await bcrypt.hash(defaultUserPassword, saltRounds)
        await createDefaultUser(collection, defaultUserName, passwordHash)
        console.log('default user CREATED')
    } else {
        console.log('default user FOUND')
    }
    connection.close()
}

setup()
console.log(`MONGO Connection string ${connectionString}`)
console.log(`MONGO Collection ${collectionName}`)