server.js

let express = require('express');
let app = express();
let multer = require('multer');

// File size upgrage: https://github.com/expressjs/multer/issues/436
let upload = multer({
    limits: {
        fieldSize: 1064 * 1024 * 1024
    }
})

let MongoClient = require('mongodb').MongoClient;
let ObjectId = require("mongodb").ObjectID;
let hash = require('object-hash');

let cookieParser = require('cookie-parser');
app.use(cookieParser());

let reloadMagic = require('./reload-magic.js')
reloadMagic(app)

// REQUEST!
const request = require('request');


let Export_Mongo = false; // Set to false when you do not care about exporting the data (most of the time)

// To BACKUP MONGO IN A FILE
const fs = require('fs');
let server_date_time = require("./src/js-lib/date_time_format_serverside.js")

let saveToFile = (filename, data) => {

    let filePath = "./MongoExports/"
    let fileExt = ".txt"
    let now = server_date_time().filename

    // Produce the filename
    let file = filePath + now + filename + fileExt

    // Stringify the data
    let dataToString = JSON.stringify(data)

    // Write the file
    fs.writeFile(file, dataToString, (err) => {
        // Error management
        if (err) throw err;

        // Success case, the file was saved
        console.log("\nSave to file success!\n File: " + file + "\n");
    });
}

app.use('/', express.static('build')); // Needed for the HTML and JS files
app.use('/', express.static('public')); // Needed for local assets

// ==================================================================================================== Database


// IMPORTANT! - That mongo connection TAKES TIME!
// ==============================================
//      If we don't await for it, a cookie request enters before `dbo` is defined.
//
//      And I get:
//          (node:72196) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'collection' of undefined
//
//      But we just cant use await here...
//
// SOLUTION:
//
//  Have the WHOLE server (endpoint and everything) in a function... So it does not run right away.
//
//  Call that function when `dbo` is defined.
//
// ==============================================

// To run on Bes7weB-laptop:
let url = "mongodb+srv://Bes7weB:bmowi6R4jOiVe8LDzI2q@cluster0-8e3qb.gcp.mongodb.net/test?retryWrites=true&w=majority"

// To run on HostWinds:
//let url = "mongodb://localhost:27017"

MongoClient.connect(url, {
    useNewUrlParser: true,
    useUnifiedTopology: true
}, (err, db) => {
    if (err) {
        console.log("LINE# 88 - MongoClient connect error - ", err)
    }
    let dbo = db.db("BookMarker")

    // dbo is now defined... Start the server!
    start_server(dbo)
})

// ============================================================================================================================================================ SERVER

let start_server = dbo => {

    // =============================================================================================================================== FUNCTIONS
    let generateSessionId = () => {
        return "" + Math.floor(Math.random() * 10000000000);
    };

    // =============================================================================================================================== DBO FUNCTIONS

    // ======================================= SESSION GET / SET / DEL
    let db_session = async action => {

        // action must be an object:
        //      for "set" : { do: "set", sid: [number], user_id: [number] }
        //      for "get" : { do: "get", sid: [number] }
        //      for "del" : { do: "del", sid: [number] }

        //console.log("LINE# 115 - Request to sessions is starting.", action.sid)

        if (
            (
                action.do !== undefined && // action.do must be well defined
                typeof (action.do) === "string" &&
                action.do.length === 3
            ) &&
            (
                typeof (action.callback) === "function" // in ALL cases, a callback must be provided
            ) &&
            (
                (
                    action.sid !== undefined && // sid must be present and be a number
                    !isNaN(parseInt(action.sid))
                ) ||
                action.user_id !== undefined
            )
        ) {

            // We have all params...
            //console.log("LINE# 136 - Conditions met.")

            switch (action.do) {

                // ==================================================================== SET
                case "set":

                    if (action.user_id) {
                        console.log("LINE# 144 - Attempting a session SET")
                        return dbo.collection('sessions').insertOne({
                            sid: action.sid,
                            user_id: action.user_id,
                            date: action.date
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 151 - user SET error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on set user.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 160 - db_result", db_result)

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no user_id
                    else {
                        return null
                    }
                    break;

                    // ==================================================================== GET
                case "get":

                    if (action.sid) {
                        console.log("LINE# 177 - Attempting a session GET")
                        return dbo.collection('sessions').findOne({
                            sid: action.sid,
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 182 - user GET error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on find user.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 191 - db_result", db_result)

                            if (Export_Mongo) {
                                // MONGO DATA SAVED to file!
                                saveToFile("Sessions", db_result)
                            }

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no sid
                    else {
                        return null
                    }
                    break;

                    // ==================================================================== DEL
                case "del":

                    if (action.sid) {
                        console.log("LINE# 213 - Attempting a session DEL")
                        return dbo.collection('sessions').deleteOne({
                            sid: action.sid
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 218 - user DEL error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on delete user.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 227 - db_result", db_result)

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no sid
                    else {
                        return null
                    }
                    break

                    // ==================================================================== DEFAULT
                default:
                    console.log("LINE# 242 - Attempting nothing... You provided garbage in 'do'.")
                    return null
            } // END switch

            // Failed on conditions
        } else {
            // ==================================================================== Missing or malformed params
            console.log("LINE# 249 - Request to sessions failed on params condition.")
            return null
        }
    } // END db_session()

    // ======================================= USER GET / SET / DEL  using username / sid
    let db_user = async action => {

        // action must be an object:
        //      for "set" : { do: "set", username: [string], password: [string], bank_id: [dbo inserted id]}
        //      for "get" : { do: "get", user_id: [number], username: [string] } // One of the two... But if username, a password must be matching
        //      for "del" : { do: "del", user_id: [number] } NOT DONE YET
        //      for "upd" : { do: "upd", user_id: [number], username: [string], password: [string] } NOT DONE YET

        //console.log("LINE# 263 - Request to users is starting.")

        if (
            (
                action.do !== undefined && // action.do must be well defined
                typeof (action.do) === "string" &&
                action.do.length === 3
            ) &&
            (
                typeof (action.callback) === "function" // in ALL cases, a callback must be provided
            ) &&
            (
                action.user_id !== undefined || // Needs at least one username OR user_id
                (action.username !== undefined && action.password !== undefined)
            )
        ) {

            // We have all params...
            //console.log("LINE# 281 - Conditions met.")

            switch (action.do) {

                // ==================================================================== SET
                case "set":

                    if (action.username && action.password && action.bank_id) {
                        console.log("LINE# 289 - Attempting a user SET")
                        return dbo.collection('users').insertOne({
                            name: action.username,
                            password: action.password,
                            bank_id: action.bank_id
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 296 - user insert error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on find user.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 305 - db_result", db_result)

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no username password and bank_id (obtained from a GET links...)
                    else {
                        return null
                    }
                    break;

                    // ==================================================================== GET
                case "get":

                    // username
                    if (action.username) {
                        console.log("LINE# 323 - Attempting a user GET")

                        return dbo.collection('users').findOne({
                            name: action.username
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 329 - user GET error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on find user.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 338 - db_result", db_result)

                            // A user is found
                            if (db_result !== null) {
                                console.log("LINE# 342 - User found.")

                                // Password match?
                                if (db_result.password === action.password) {
                                    console.log("LINE# 346 - Password match.")

                                    if (Export_Mongo) {
                                        // MONGO DATA SAVED to file!
                                        saveToFile("Users", db_result)
                                    }

                                    // go on with the provided callback
                                    return action.callback(db_result)
                                }

                                console.log("LINE# 357 - Password do not match.")
                                return null
                            }

                            console.log("LINE# 361 - User not found.")
                            return action.callback(db_result)
                        })
                    }

                    // user_id
                    else if (action.user_id) {
                        console.log("LINE# 368 - Attempting a user GET")

                        return dbo.collection('users').findOne({
                            _id: ObjectId(action.user_id)
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 374 - user GET error", err);
                                local_session_response = {
                                    success: false,
                                    errorMsg: "DBO error on find session",
                                    err: err
                                };
                                return null
                            }

                            //console.log("LINE# 383 - db_result", db_result)

                            if (Export_Mongo) {
                                // MONGO DATA SAVED to file!
                                saveToFile("Users", db_result)
                            }

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no username of user_id
                    else {
                        return null
                    }
                    break;

                    // ==================================================================== DEL
                case "del":

                    console.log("LINE# 404 - Attempting nothing... DEL is not written yet.")
                    return null
                    break

                    // ==================================================================== UPD
                case "upd":

                    console.log("LINE# 411 - Attempting nothing... UPD is not written yet.")
                    return null
                    break

                    // ==================================================================== DEFAULT
                default:
                    console.log("LINE# 417 - Attempting nothing... You provided garbage in 'do'.")
                    return null
            } // END switch

            // Failed on conditions
        } else {
            // ==================================================================== Missing or malformed params
            console.log("LINE# 424 - Request to sessions failed on params condition.")
            return null
        }
    } // END db_user()


    // ======================================= LINK GET / SET / DEL
    let db_link = async action => {

        // action must be an object:
        //      for "set" : { do: "set", categories: [array of objects], links: [array of objects], history: [array of objects] }
        //      for "get" : { do: "get", bank_id: [dbo inserted id] }
        //      for "del" : { do: "del", bank_id: [dbo inserted id] }   NOT DONE YET

        //      UPDATES: "upd"
        //      for User usaved changes: { do: "upd", bank_id: [dbo inserted id], categories: [array of objects], links: [array of objects], history: [array of objects] }
        //      for Click count: { do: "upd", bank_id: [dbo inserted id], linkID: [integer], newClickDate: [Object] }

        //console.log("LINE# 442 - Request to links is starting.")

        if (
            (
                action.do !== undefined && // action.do must be well defined
                typeof (action.do) === "string" &&
                action.do.length === 3
            ) &&
            (
                typeof (action.callback) === "function" // in ALL cases, a callback must be provided
            )
        ) {

            // We have all params...
            //console.log("LINE# 456 - Conditions met.")

            switch (action.do) {

                // ==================================================================== SET
                case "set":

                    if (action.categories && action.links && action.history) {
                        console.log("LINE# 464 - Attempting a link SET")
                        return dbo.collection('links').insertOne({
                            categories: action.categories,
                            links: action.links,
                            history: action.history,
                            images: action.images
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 472 - user insert error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on SET links.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 481 - db_result", db_result)

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no bank_id and all data
                    console.log("LINE# 489 - Missing data!")
                    return null

                    break;

                    // ==================================================================== GET
                case "get":

                    if (action.bank_id) {
                        console.log("LINE# 498 - Attempting a link GET")
                        return dbo.collection('links').findOne({
                            _id: ObjectId(action.bank_id)
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 503 - user GET error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on GET links.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 512 - db_result", db_result)

                            if (Export_Mongo) {
                                // MONGO DATA SAVED to file!
                                saveToFile("Links", db_result)
                            }

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no bank_id
                    console.log("LINE# 525 - No bank_id.")
                    return null

                    break;

                    // ==================================================================== DEL
                case "del":

                    console.log("LINE# 533 - Attempting nothing... DEL is not written yet.")
                    return null
                    break

                    // ==================================================================== UPD
                case "upd":

                    // When user ssaves the "unsaved changes"
                    if (action.bank_id && action.categories && action.links && action.history) {
                        console.log("LINE# 542 - Attempting a link UPD - Saving changes")

                        return dbo.collection("links").updateOne({
                            _id: ObjectId(action.bank_id)
                        }, {
                            $set: {
                                categories: action.categories,
                                links: action.links,
                                history: action.history
                            }
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 554 - user GET error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on UPD links.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 563 - db_result", db_result)

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // When a click is counted
                    if (action.bank_id && action.linkID && action.newClickDate) {
                        console.log("LINE# 572 - Attempting a link UPD - Click count")

                        let arrayIndex = parseInt(action.linkID)
                        //console.log("arrayIndex", arrayIndex, typeof (arrayIndex))
                        //console.log("newClickDate", action.newClickDate)

                        return dbo.collection("links").updateOne({
                            _id: ObjectId(action.bank_id)
                        }, {
                            $push: {
                                "links.$[filteredLink].clickCount": action.newClickDate
                            }
                        }, {
                            arrayFilters: [{
                                "filteredLink.linkArrayIndex": arrayIndex
                            }]
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 590 - user GET error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on UPD links.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 599 - db_result", db_result)

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no bank_id and all data
                    console.log("LINE# 607 - Missing data!")
                    return null
                    break

                    // ==================================================================== DEFAULT
                default:
                    console.log("LINE# 613 - Attempting nothing... You provided garbage in 'do'.")
                    return null
            } // END switch

            // Failed on conditions
        } else {
            // ==================================================================== Missing or malformed params
            console.log("LINE# 620 - Request to sessions failed on params condition.")
            return null
        }
    } // END db_link()

    // ======================================= IMAGE GET / SET
    let db_image = async action => {

        // action must be an object:
        //      for "set" : { do: "set", bank_id: [dbo inserted id], base64: "[text  node]", activeLink: INT, lastID: INT }
        //      for "get" : { do: "get", bank_id: [dbo inserted id] }

        //console.log("LINE# 632 - Request to links is starting.")

        if (
            (
                action.do !== undefined && // action.do must be well defined
                typeof (action.do) === "string" &&
                action.do.length === 3
            ) &&
            (
                typeof (action.callback) === "function" // in ALL cases, a callback must be provided
            )
        ) {

            // We have all params...
            //console.log("LINE# 646 - Conditions met.")

            switch (action.do) {

                // ==================================================================== SET
                case "set":

                    if (action.bank_id && action.base64 && action.activeLink && action.lastID) {
                        console.log("LINE# 654 - Attempting a link SET")
                        return dbo.collection('links').updateOne({
                                _id: ObjectId(action.bank_id)
                            }, {
                                $push: {
                                    images: {
                                        base64: action.base64
                                    }
                                }
                                // ,
                                // $set: {
                                //     "links.$[filteredLink].imageID": action.lastID
                                // }
                            },
                            // {
                            //     arrayFilters: [{
                            //         "filteredLink": action.activeLink
                            //     }]
                            // }, 
                            (err, db_result) => {
                                if (err) {
                                    console.log("LINE# 675 - user insert error", err);
                                    res.json({
                                        success: false,
                                        errorMsg: "DBO error on SET links.",
                                        err: err
                                    })
                                    return null
                                }

                                //console.log("LINE# 684 - db_result", db_result)

                                // go on with the provided callback
                                return action.callback(db_result)
                            })
                    }

                    // if no bank_id and all data
                    console.log("LINE# 692 - Missing data!")
                    return null

                    break;

                    // ==================================================================== GET
                case "get":

                    if (action.bank_id) {
                        console.log("LINE# 701 - Attempting a link GET")
                        return dbo.collection('links').findOne({
                            _id: ObjectId(action.bank_id)
                        }, (err, db_result) => {
                            if (err) {
                                console.log("LINE# 706 - user GET error", err);
                                res.json({
                                    success: false,
                                    errorMsg: "DBO error on GET links.",
                                    err: err
                                })
                                return null
                            }

                            //console.log("LINE# 715 - db_result", db_result)

                            if (Export_Mongo) {
                                // MONGO DATA SAVED to file!
                                saveToFile("Links", db_result)
                            }

                            // go on with the provided callback
                            return action.callback(db_result)
                        })
                    }

                    // if no bank_id
                    console.log("LINE# 728 - No bank_id.")
                    return null

                    break;

                    // ==================================================================== DEFAULT
                default:
                    console.log("LINE# 735 - Attempting nothing... You provided garbage in 'do'.")
                    return null
            } // END switch

            // Failed on conditions
        } else {
            // ==================================================================== Missing or malformed params
            console.log("LINE# 742 - Request to sessions failed on params condition.")
            return null
        }
    } // END db_image()

    // ======================================================================== MATCH IMAGES WITH LINKS
    let matchImage = db_link => {

        let User_Images = db_link.images

        let User_Links = db_link.links.map(link => {

            // Set the image from the images array
            link.image = User_Images[link.imageID].base64
            return link
        })

        return User_Links
    }

    // =============================================================================================================================== ENDPOINTS

    // =========================================================================================================== Signup
    app.post('/signup', upload.none(), async (req, res) => {
        console.log("\n======================================================= /signup")

        let usr = req.body.username
        let pwd = hash({
            passwordHashed: req.body.password
        }) // has to be an object

        // ========= Information collection while the dbo resquest are going.
        let collected = {}

        let signed_up = session_response => {
            if (session_response !== null) {
                console.log("LINE# 778 - Cookie created.")
                console.log("\n============= Signup success. =============\n\n")

                // Create a sid
                res.cookie("sid", collected.sid);

                // Match relevant images with links (filtering the deleted links btw)
                let User_Links = matchImage({
                    links: collected.links,
                    images: collected.images
                })

                // Get the REAL links length (used on client side for the linkArrayIndex)
                let realLinksLength = 1 //db_link_response.links.length

                // Request response
                res.json({
                    success: true,
                    errorMsg: "New user created. Welcome on BookMarker.club!",
                    user: {
                        username: collected.username,
                        userBank_id: collected.bank_id,
                        categories: collected.categories,
                        links: User_Links,
                        history: collected.history,
                        realLinksLength: realLinksLength
                    }
                });
            }

            // No response from session set??? It would be surprising...
            else {
                console.log("LINE# 810 - Cookie not created.")
                res.json({
                    success: false,
                    errorMsg: "Something when wrong with the session setting..."
                });
            }
        }

        // Set a session
        set_session = async (set_new_user_result) => {
            if (set_new_user_result !== null) {
                console.log("LINE# 821 - New user created.")
                console.log("\n==============================\n  Welcome on BookMarker.club!  \n==============================\n\n")

                // Set a cookie
                let sid = generateSessionId();

                // Collect some infos
                collected["username"] = set_new_user_result.ops[0].name
                collected["bank_id"] = set_new_user_result.ops[0].bank_id
                collected["sid"] = sid

                return db_session({
                    do: "set",
                    user_id: set_new_user_result.ops[0]._id,
                    sid: sid,
                    callback: signed_up
                })
            }

            console.log("LINE# 840 - New user not created.")
            return null
        }

        // Create the new user
        let set_new_user = async (set_startup_link_response) => {
            if (set_startup_link_response !== null) {
                console.log("LINE# 847 - Startup links created.")

                // Collect some infos
                collected["categories"] = set_startup_link_response.ops[0].categories
                collected["links"] = set_startup_link_response.ops[0].links
                collected["history"] = set_startup_link_response.ops[0].history
                collected["images"] = set_startup_link_response.ops[0].images

                return db_user({
                    do: "set",
                    username: usr,
                    password: pwd,
                    bank_id: set_startup_link_response.ops[0]._id,
                    callback: set_session
                })
            }

            console.log("LINE# 864 - Startup links not created.")
            return null
        }

        // If user does not exist, create it's startup links
        let set_startup_link = async user_exist_response => {
            if (user_exist_response !== null) {
                console.log("LINE# 871 - username already taken.");
                res.json({
                    success: false,
                    errorMsg: "Username already taken."
                });
                return null;
            }

            console.log("LINE# 879 - username available.");

            return db_link({
                do: "set",
                categories: emptyBank.categories,
                links: emptyBank.links,
                history: emptyBank.history,
                images: emptyBank.images,
                callback: set_new_user
            })
        }

        // check if the username is already taken.
        return db_user({
            do: "get",
            username: usr,
            password: pwd,
            res: res,
            callback: set_startup_link
        })
    })

    // =========================================================================================================== Login
    app.post('/login', upload.none(), async (req, res) => {
        console.log("\n======================================================= /login")

        let pwd = hash({
            passwordHashed: req.body.password
        }) // has to be an object

        // ========= Information collection while the dbo resquest are going.
        let collected = {}

        let logged_in = db_link_response => {
            if (db_link_response !== null) {
                console.log("LINE# 914 - User links retreived.")
                console.log("\n============= Login success. =============\n\n")

                // Get the REAL links length (used on client side for the linkArrayIndex)
                let realLinksLength = db_link_response.links.length

                // Add the linkArrayIndex
                db_link_response.links = db_link_response.links.map((link, index) => {
                    link.linkArrayIndex = index
                    return link
                })

                // Remove the deleted link
                let deletedPurged = db_link_response.links.filter(link => {
                    return !link.deleted
                })
                db_link_response.links = deletedPurged

                // Match relevant images with links (filtering the deleted links btw)
                let User_Links = matchImage(db_link_response)

                // Request response
                res.cookie("sid", collected.sid);
                res.json({
                    success: true,
                    errorMsg: "No error.",
                    user: {
                        username: collected.username,
                        userBank_id: collected.bank_id,
                        categories: db_link_response.categories,
                        links: User_Links,
                        history: db_link_response.history,
                        realLinksLength: realLinksLength
                    }
                })
                return null
            }

            console.log("LINE# 952 - User links not retreived.")
            return null
        }

        let get_links = async set_session_response => {
            if (set_session_response !== null) {
                console.log("LINE# 958 - Session setted.")

                return db_link({
                    do: "get",
                    bank_id: collected.bank_id,
                    callback: logged_in
                })
            }

            console.log = ("LINE# 967 - Session not setted.")
            return null
        }

        let set_session = async get_user_response => {
            if (get_user_response !== null) {
                console.log("LINE# 973 - User valid.")

                // Create a sid
                let sid = generateSessionId();

                // Collect soome infos.
                collected["username"] = get_user_response.username
                collected["bank_id"] = get_user_response.bank_id
                collected["sid"] = sid

                // Set a session
                return db_session({
                    do: "set",
                    user_id: get_user_response._id,
                    sid: sid,
                    callback: get_links
                })
            }

            console.log("LINE# 992 - User invalid.")
            res.json({
                success: false,
                errorMsg: "User not found."
            });
            return null;
        }

        return db_user({
            do: "get",
            username: req.body.username,
            password: pwd,
            res: res,
            callback: set_session
        })
    })

    // =========================================================================================================== Cookie
    app.post('/cookie', upload.none(), async (req, res) => {
        console.log("\n======================================================= /cookie")

        let sid = req.cookies.sid

        // ========= Information collection while the dbo resquest are going.
        let collected = {}

        let cookie_logged = db_link_response => {
            if (db_link_response !== null) {
                console.log("LINE# 1020 - User links found.")
                console.log("\n============= Cookie login success. =============\n\n")

                // Get the REAL links length (used on client side for the linkArrayIndex)
                let realLinksLength = db_link_response.links.length

                // Add the linkArrayIndex
                db_link_response.links = db_link_response.links.map((link, index) => {
                    link.linkArrayIndex = index
                    return link
                })

                // Remove the deleted link
                let deletedPurged = db_link_response.links.filter(link => {
                    return !link.deleted
                })
                db_link_response.links = deletedPurged

                // Match relevant images with links (filtering the deleted links btw)
                let User_Links = matchImage(db_link_response)

                res.json({
                    success: true,
                    errorMsg: "User links found.",
                    user: {
                        username: collected.username,
                        userBank_id: collected.bank_id,
                        categories: db_link_response.categories,
                        links: User_Links,
                        history: db_link_response.history,
                        realLinksLength: realLinksLength
                    }
                });
            } else {
                console.log("LINE# 1054 - User links not found.")
                res.json({
                    success: false,
                    errorMsg: "User links not found."
                })
                return null
            }
        }

        // Get our user's links
        let get_links = async (get_user_response) => {
            // If user found
            if (get_user_response !== null) {
                console.log("LINE# 1067 - User found.")

                collected["username"] = get_user_response.name
                collected["bank_id"] = get_user_response.bank_id

                return db_link({
                    do: "get",
                    bank_id: get_user_response.bank_id,
                    callback: cookie_logged
                })
            }

            // User not found
            console.log("LINE# 1080 - User not found.")
            res.json({
                success: false,
                errorMsg: "User not found."
            })
            return null
        }

        // Get our user
        let get_user = async (session_response) => {
            // Session found?
            if (session_response !== null) {
                console.log("LINE# 1092 - Session found.")
                return db_user({
                    do: "get",
                    user_id: session_response.user_id,
                    callback: get_links
                })
            }

            // Session not found
            console.log("LINE# 1101 - Session not found.")
            res.json({
                success: false,
                errorMsg: "Session not found."
            })
            return null
        }

        // Check the session
        return db_session({
            do: "get",
            sid: sid,
            res: res,
            callback: get_user
        })

    }) // END app.post('/cookie')

    // =========================================================================================================== Logout
    app.post('/logout', upload.none(), async (req, res) => {
        console.log("\n======================================================= /logout")

        let logged_out = kill_session_response => {
            if (kill_session_response !== null) {
                console.log("LINE# 1125 - Session destroyed.")
                console.log("\n============= Logout success. =============\n\n")

                res.json({
                    success: true,
                    errorMsg: "Session removed."
                })
                return null
            }

            console.log("LINE# 1135 - Session not destroyed.")
            res.json({
                success: false,
                errorMsg: "Failed to remove the session."
            })
        }

        let kill_session = async session_response => {
            if (session_response !== null) {
                console.log("LINE# 1144 - About to destroy the session...")

                return db_session({
                    do: "del",
                    sid: req.cookies.sid,
                    callback: logged_out
                })
            }

            console.log("LINE# 1153 - Session not found.")
            res.json({
                success: false,
                errorMsg: "Session not found."
            })
        }

        // Check if the session exists
        return db_session({
            do: "get",
            sid: req.cookies.sid,
            res: res,
            callback: kill_session
        })
    })

    // =========================================================================================================== Validate URL
    app.post('/valid-url', upload.none(), async (req, res) => {

        console.log("\n========================================== REQUEST TO /valid-url ")
        let urlToCheck = req.body.url

        let check_url = async session_response => {
            if (session_response !== null) {
                console.log("LINE# 1177 - Session found, verifying the url.")

                request
                    .get(urlToCheck)
                    .on('error', function (err) {
                        console.log("LINE# 1182 - ERROR on request - ", err)
                        res.json({
                            success: false,
                            errorMsg: "ERROR on request.",
                            err: err
                        })
                        return null
                    })
                    .on('response', function (response) {
                        //console.log("LINE# 1191 - response.statusCode", response.statusCode)
                        if (response.statusCode === 200) {
                            console.log("LINE# 1193 - URL valid.\n\n")
                            res.json({
                                success: true,
                                errorMsg: "URL valid."
                            })
                        } else {
                            console.log("LINE# 1199 - URL invalid.\n\n")
                            res.json({
                                success: false,
                                errorMsg: "URL invalid."
                            })
                        }
                    })
                return null
            }

            console.log("LINE# 1209 - Session not found.")
            res.json({
                success: false,
                errorMsg: "Session not found."
            })
        }

        // Check if the session exists
        return db_session({
            do: "get",
            sid: req.cookies.sid,
            res: res,
            callback: check_url
        })
    })

    // =========================================================================================================== SAVE image
    app.post('/save-image', upload.none(), async (req, res) => {

        console.log("\n======================================================= /save-image ")

        // ========= Information collection while the dbo resquest are going.
        let collected = {}

        let data_update = async data_update_response => {
            if (data_update_response !== null) {
                console.log("LINE# 1235 - Data saved.")
                console.log("\n============= Save success. =============\n\n")

                res.json({
                    success: true,
                    errorMsg: "Image saving is done.",
                    imageID: collected.lastID // The image ID is "images" array last record
                })
                return
            }

            console.log("LINE# 1246 - Data saving failed.")
            res.json({
                success: false,
                errorMsg: "Data saving failed."
            })
        }

        let process_data = async process_data_response => {
            if (process_data_response !== null) {
                console.log("LINE# 1255 - Links found.")

                // Define the ID for the new image to be saved.
                let lastID = process_data_response.images.length
                collected.lastID = process_data_response.images.length
                console.log("lastID", lastID)

                // res.json({
                //     success: true,
                //     errorMsg: "ok......."
                // })

                return db_image({
                    do: "set",
                    bank_id: req.body.bank_id,
                    base64: req.body.base64,
                    activeLink: req.body.activeLink,
                    lastID: lastID,
                    callback: data_update
                })
            }

            console.log("LINE# 1277 - Links not found.")
            res.json({
                success: false,
                errorMsg: "Links not found."
            })
        }

        let get_data = async session_response => {
            if (session_response !== null) {
                console.log("LINE# 1286 - Session found.")

                return db_link({
                    do: "get",
                    bank_id: req.body.bank_id,
                    callback: process_data
                })
            }

            console.log("LINE# 1295 - Session not found.")
            res.json({
                success: false,
                errorMsg: "Session not found."
            })
        }

        // Check the session
        return db_session({
            do: "get",
            sid: req.cookies.sid,
            callback: get_data
        })
    })

    // =========================================================================================================== SAVE user's changes
    app.post('/save', upload.none(), async (req, res) => {

        console.log("\n======================================================= /save ")

        // ========= Information collection while the dbo resquest are going.
        let collected = {}

        let data_update = async data_update_response => {
            if (data_update_response !== null) {
                console.log("LINE# 1317 - Data saved.")
                console.log("\n============= Save success. =============\n\n")

                res.json({
                    success: true,
                    history: collected.history,
                    errorMsg: "Data saving is done."
                })
                return
            }

            console.log("LINE# 1327 - Data saving failed.")
            res.json({
                success: false,
                errorMsg: "Data saving failed."
            })
        }

        let process_data = async process_data_response => {
            if (process_data_response !== null) {
                console.log("LINE# 1336 - Links found.")

                // Update the history
                let updated_history = process_data_response.history.concat(JSON.parse(req.body.history))
                collected["history"] = updated_history

                return db_link({
                    do: "upd",
                    bank_id: req.body.bank_id,
                    categories: JSON.parse(req.body.categories),
                    links: JSON.parse(req.body.links),
                    history: updated_history,
                    callback: data_update
                })
            }

            console.log("LINE# 1351 - Links not found.")
            res.json({
                success: false,
                errorMsg: "Links not found."
            })
        }

        let get_data = async session_response => {
            if (session_response !== null) {
                console.log("LINE# 1360 - Session found.")
                console.log("req.body.bank_id", req.body.bank_id)

                return db_link({
                    do: "get",
                    bank_id: req.body.bank_id,
                    callback: process_data
                })
            }

            console.log("LINE# 1370 - Session not found.")
            res.json({
                success: false,
                errorMsg: "Session not found."
            })
        }

        // Check the session
        return db_session({
            do: "get",
            sid: req.cookies.sid,
            callback: get_data
        })
    })

    app.post('/clickCount', upload.none(), async (req, res) => {

        console.log("\n======================================================= /click-count ")

        let linkID = req.body.linkID
        //console.log(req.body)
        //console.log("LinkID", linkID)
        let newClickDate = {
            date: new Date().getTime()
        }

        let data_update = async data_update_response => {
            //console.log(data_update_response.result)
            if (data_update_response.result.nModified === 1) {
                console.log("LINE# 1399 - Data saved.")

                console.log("\n============= Click count success. =============\n\n")

                res.json({
                    success: true,
                    errorMsg: "Click count done.",
                    newClickDate: newClickDate
                })
                return
            }

            console.log("\nLINE# 1411 - Data saving failed.")
            res.json({
                success: false,
                errorMsg: "Data saving failed."
            })
        }

        let process_data = async process_data_response => {
            if (process_data_response !== null) {
                console.log("LINE# 1420 - Links found.")

                return db_link({
                    do: "upd",
                    bank_id: req.body.bank_id,
                    linkID: linkID,
                    newClickDate: newClickDate,
                    callback: data_update
                })
            }

            console.log("LINE# 1431 - Links not found.")
            res.json({
                success: false,
                errorMsg: "Links not found."
            })
        }

        let get_data = async session_response => {
            if (session_response !== null) {
                console.log("LINE# 1440 - Session found.")

                return db_link({
                    do: "get",
                    bank_id: req.body.bank_id,
                    callback: process_data
                })
            }

            console.log("LINE# 1449 - Session not found.")
            res.json({
                success: false,
                errorMsg: "Session not found."
            })
        }

        // Check the session
        return db_session({
            do: "get",
            sid: req.cookies.sid,
            callback: get_data
        })
    })

    // =============================================================================================================================== ENDPOINTS ALL

    // ============================================================================== React router 
    app.get('/addLink/:url', (req, res) => {
        console.log("LINE# 1468 - app.get('/addLink/:url')")
        res.sendFile(__dirname + '/build/index.html');
    })

    // ============================================================================== Server listen to requests...
    app.listen(4000, '0.0.0.0', () => {
        console.log("LINE# 1474 - Server running on port 4000")
    })

} // ========================================================================================================================================================== END start_server(dbo)

// ============================================================================================================================================================ DEFAULT BANK

let emptyBank = {
    categories: [{
        name: "Welcome!",
        content: [
            0
        ],
        order: 0
    }],
    links: [{
        name: "Demo link",
        href: "https://stackoverflow.com/",
        imageID: 0,
        linkArrayIndex: 0,
        comment: [{
            attributes: {
                "bold": true,
            },
            "insert": "StackOverflow"
        }, {
            "insert": " is the best programer's ressource!"
        }],
        rating: 5,
        clickCount: []
    }],
    history: [{
        target: "Link",
        index: 0,
        property: "ALL",
        oldValue: "",
        newValue: "Demo link",
        time: new Date().getTime()
    }],
    images: [{
        base64: 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",
    }]
}

// ============================================================================================================================================================