Invoices can be created

- Transactions can now be tracked

config.ts

@@ -0,0 +1,37 @@
+/**
+ * Here you can change various settings like database credentials, http settings and more.
+ * 
+ * Debug mode and MongoDB credentials are set via enviroment variables for security reasons.
+ */
+export const config: IConfig = {
+    authentification: {
+        pepper: 'J3%_zö\\^',
+        salt_length: 8,
+        argonTimecost: 8,
+        minPasswordLength: 4,
+        maxPasswordLength: 150
+    },
+    http: {
+        port: 2009,
+        host: "0.0.0.0"
+    }
+}
+/**
+ * END OF CONFIG
+ * ====================
+ */
+
+
+export interface IConfig {
+    authentification: {
+        pepper: string,
+        salt_length: number,
+        argonTimecost: number,
+        minPasswordLength: number,
+        maxPasswordLength: number
+    },
+    http: {
+        port: number,
+        host: string
+    }
+}

package.json

@@ -21,6 +21,7 @@
   "author": "Mondei1",
   "license": "MIT",
   "dependencies": {
+    "argon2": "^0.27.1",
     "body-parser": "^1.19.0",
     "cors": "^2.8.5",
     "dotenv": "^8.2.0",
@@ -30,9 +31,9 @@
     "mongoose": "^5.11.8",
     "mysql": "^2.18.1",
     "ts-node": "^9.1.1",
-    "typeorm": "^0.2.29",
     "typescript": "^4.1.3",
-    "winston": "^3.3.3"
+    "winston": "^3.3.3",
+    "zeromq": "^6.0.0-beta.6"
   },
   "devDependencies": {
     "@types/typescript": "2.0.0",
@@ -42,6 +43,9 @@
     "@types/winston": "2.4.4",
     "@types/dotenv": "8.2.0",
     "@types/jsonwebtoken": "8.5.0",
-    "@types/mysql": "2.15.16"
+    "@types/mysql": "2.15.16",
+    "@types/mongoose": "5.10.3",
+    "@types/argon2": "0.15.0",
+    "@types/zeromq": "4.6.3"
   }
 }

src/app.ts

@@ -1,8 +1,27 @@
+import * as bodyParser from 'body-parser';
+import * as cors from 'cors';
+import { config as dconfig } from 'dotenv';
+import * as express from 'express';
 import * as rpc from 'jayson';
-import { createConnection } from 'typeorm';
+import * as mongoose from 'mongoose';
 import * as winston from 'winston';
 
+import { config } from '../config';
+import { hashPassword, randomPepper, randomString } from './helper/crypto';
+import { InvoiceScheduler } from './helper/invoiceScheduler';
+import { User } from './models/user/user.model';
+import { invoiceRouter } from './routes/invoice';
+
+// Load .env
+dconfig({ debug: true, encoding: 'UTF-8' });
+
 export const IS_DEBUG = process.env.DEBUG == 'true';
+export const MONGO_URI = process.env.MONGO_URI || "";
+export const JWT_SECRET = process.env.JWT_SECRET || "";
+export const INVOICE_SECRET = process.env.INVOICE_SECRET || "";
+
+export let rpcClient: rpc.HttpClient | undefined = undefined;
+export let invoiceScheduler: InvoiceScheduler | undefined = undefined;
 
 export let logger: winston.Logger;
 
@@ -38,30 +57,68 @@ async function run() {
         )
     }));
 
-    const dbConnection = await createConnection({
-        type: 'mysql',
-        host: 'localhost',
-        port: 3306,
-        username: 'librepay',
-        password: 'librepay',
-        database: 'librepay',
-        entities: ['models/**/*.ts'],
-        synchronize: true,
-        logging: false
-    }).catch(error => {
-        logger.error(`Connection to database failed: ${error}`);
+    if (IS_DEBUG) {
+        logger.info('Debug mode is enabled. Do not use this in production!');
+    }
+
+    if (JWT_SECRET == '') {
+        logger.crit('No JWT secret was provided. Make sure you add JWT_SECRET=YOUR_SECRET to your .env file.');
+        process.exit(1);
+    }
+
+    if (MONGO_URI == '') {
+        logger.crit('No MongoDB URI was provided. Make sure you add MONGO_URI=mongodb+srv://... to your .env file.')
+        process.exit(1);
+    }
+
+    if (INVOICE_SECRET == '') {
+        logger.crit('No invoice secret was provided. Make sure you add INVOICE_SECRET=(long random string) to your .env file.')
+        process.exit(1);
+    }
+
+    const connection = await mongoose.connect(MONGO_URI, { useNewUrlParser: true, useUnifiedTopology: true }).catch((err) => {
+        logger.crit("Database connection could not be made: ", err);
         process.exit(1);
     });
+    logger.info(`Database connection made to ${mongoose.connection.host}`);
+
+    // Check if admin account doesn't exists
+    if((await User.countDocuments()) == 0) {
+        const randomPassword = "$1" + randomString(12);
+        const salt = randomString(config.authentification.salt_length);
+
+        await User.create({
+            name: 'admin',
+            password: await hashPassword(randomPassword + salt + randomPepper()),
+            salt,
+            createdAt: new Date(Date.now()),
+            lastLogin: new Date(0)
+        });
+        logger.info("=================================================================================");
+        logger.info("ADMIN USER HAS BEEN CREATED! Username: admin\tPassword: " + randomPassword);
+        logger.info("=================================================================================");
+    } else {
+        logger.debug("At least one admin user already exists, skip.");
+    }
+
+    invoiceScheduler = new InvoiceScheduler();
     
-    const client = rpc.Client.http({
+    const app = express();
+    app.use(express.json());
+    app.use(cors());
+    app.use(bodyParser.json({ limit: '2kb' }));
+
+    app.get('/', (req, res) => res.status(200).send('OK'));
+    app.use('/invoice', invoiceRouter);
+
+    app.listen(config.http.port, config.http.host, () => {
+        logger.info(`HTTP server started on port ${config.http.host}:${config.http.port}`);
+    });
+
+    rpcClient = rpc.Client.http({
         port: 18332,
         auth: 'admin:admin'        
     });
-
-    /*client.request('getnewaddress', ['TestRPC', 'bech32'], (err, response) => {
-        if (err) throw err;
-        console.log(response.result);
-    })*/
 }
 
 run();

src/controllers/invoice.ts

@@ -1,5 +1,79 @@
 import { Request, Response } from "express";
+import { invoiceScheduler, INVOICE_SECRET } from "../app";
+import { CryptoUnits, FiatUnits } from "../helper/types";
+import { ICart, IInvoice } from "../models/invoice/invoice.interface";
+import { Invoice } from "../models/invoice/invoice.model";
+import { rpcClient } from '../app';
 
+// POST /invoice/?sercet=XYZ
 export async function createInvoice(req: Request, res: Response) {
-    const paymentMethods = req.body.methods;
+    const secret = req.query.secret;
+    if (secret === undefined) {
+        res.status(401).send({ message: 'secret parameter is missing' });
+        return;
+    } else {
+        if (secret !== INVOICE_SECRET) {
+            setTimeout(() => {
+                res.status(401).send();
+            }, 1200);
+            return;
+        }
+    }
+
+    const paymentMethods: CryptoUnits[] = req.body.methods;
+    const successUrl: string = req.body.successUrl;
+    const cancelUrl: string = req.body.cancelUrl;
+    const cart: ICart[] = req.body.cart;
+    const currency: FiatUnits = req.body.currency;
+    const totalPrice: number = req.body.totalPrice;
+
+    if (paymentMethods === undefined) {
+        res.status(400).send({ message: '"paymentMethods" are not provided!' });
+        return;
+    }
+
+    if (successUrl === undefined) {
+        res.status(400).send({ message: '"successUrl" is not provided!' });
+        return;
+    }
+
+    if (cancelUrl === undefined) {
+        res.status(400).send({ message: '"cancelUrl" is not provided!' });
+        return;
+    }
+
+    if (currency === undefined) {
+        res.status(400).send({ message: '"currency" is not provided!' });
+        return;
+    }
+
+    /*if (cart === undefined && totalPrice === undefined) {
+        res.status(400).send({ message: 'Either "cart" or "totalPrice" has to be defined.' });
+        return;
+    }*/
+
+    rpcClient.request('getnewaddress', ['', 'bech32'], async (err, response) => {
+        if (err) throw err;
+        //console.log(response.result);
+
+        Invoice.create({
+            paymentMethods,
+            successUrl,
+            cancelUrl,
+            cart,
+            currency,
+            totalPrice,
+            dueBy: 60,
+            receiveAddress: response.result
+        }, (error, invoice: IInvoice) => {
+            if (error) {
+                res.status(500).send({error: error.message});
+                return;
+            }
+
+            invoiceScheduler.addInvoice(invoice);
+            res.status(200).send({ id: invoice.id });
+        });
+    });
+
 }

src/helper/crypto.ts

@@ -0,0 +1,105 @@
+import { hash, verify } from 'argon2';
+import { config } from '../../config';
+import { IS_DEBUG, logger } from '../app';
+
+export async function hashPassword(input: string): Promise<string> {
+    const start = Date.now();
+
+    return new Promise<string>(async (resolve, reject) => {
+        // Get real password (remove salt and pepper)
+        const realPassword = input.substring(0, input.length - config.authentification.salt_length - 1);
+        if (!check_password_requirements(realPassword)) {
+            if (!IS_DEBUG) reject("This password does not meet the minimum requirements!");
+            else {
+                reject(`This password does not meet the minimum requirements! (${input} => ${realPassword})`);
+            }
+            return;
+        }
+
+        try {
+            const hashed = await hash(input, {
+                hashLength: 42,
+                memoryCost: 1024*32,
+                parallelism: 2,
+                timeCost: config.authentification.argonTimecost
+            });
+            const finished = Date.now();
+            logger.debug("Hashing took " + (finished-start) + "ms to finish! " + input);
+            resolve(hashed);
+        } catch(err) {
+            reject(err);
+        }
+    });
+}
+
+/**
+ * Verfiy If given password matches with provided hash by brute forcing the pepper.
+ * @param password Password with salt appended
+ * @param hashInput Hash from database
+ */
+export async function verifyPassword(password: string, hashInput: string): Promise<boolean> {
+    return new Promise<boolean>(async (resolve, reject) => {
+        const start = Date.now();
+        const peppers = config.authentification.pepper.split('');
+        const realPassword = password.substring(0, password.length - config.authentification.salt_length);
+
+        while (peppers.length !== 0) {
+            const pepper = peppers[Math.floor(Math.random() * peppers.length)];
+            if (IS_DEBUG) {
+                logger.debug(`Try ${password}}${pepper} (left: ${peppers})`);
+            } else {
+                // Show censored password (with fixed length) in non-debug mode to prevent password leaking.
+                logger.debug(`Try ********${password.replace(realPassword, '')}${pepper} (left: ${peppers})`);
+            }
+            if (await verify(hashInput, password + pepper)) {
+                const finished = Date.now();
+                logger.debug("Verifying took " + (finished - start) + "ms to complete!");
+                resolve(true);
+                return;
+            } else {
+                peppers.splice(peppers.indexOf(pepper), 1);
+            }
+        }
+        resolve(false);
+    });
+}
+
+export function randomString(length: number): string {
+    let result           = '';
+    const characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+    const charactersLength = characters.length;
+    for ( let i = 0; i < length; i++ ) {
+        result += characters.charAt(Math.floor(Math.random() * charactersLength));
+    }
+    return result;
+}
+
+export function randomPepper(): string {
+    return config.authentification.pepper.charAt(Math.floor(Math.random() * config.authentification.pepper.length));
+}
+
+/**
+ * Requirements are:
+ *  - at least 8 characters
+ *  - min one upper-, lowercase- and special character
+ *  - min one number
+ */
+export function check_password_requirements(password: string): boolean {
+    // Check for length
+    if (password.length < config.authentification.minPasswordLength ||
+        password.length > config.authentification.maxPasswordLength) return false;
+
+    // Check for one lowercase
+    if (!(/^(?=.*[a-z]).+$/.test(password))) return false;
+
+    // Check for one uppercase
+    if (!(/^(?=.*[A-Z]).+$/.test(password))) return false;
+
+    // Check for one uppercase
+    if (!(/^(?=.*[0-9]).+$/.test(password))) return false;
+
+    // Check for special characters
+    if (!(/[^A-Za-z0-9]/.test(password))) return false;
+
+    return true;
+}

src/helper/invoiceScheduler.ts

@@ -0,0 +1,105 @@
+import { IInvoice } from "../models/invoice/invoice.interface";
+import { Subscriber } from 'zeromq';
+import { logger, rpcClient } from "../app";
+import { invoiceRouter } from "../routes/invoice";
+import { Invoice } from "../models/invoice/invoice.model";
+import { PaymentStatus } from "./types";
+
+export class InvoiceScheduler {
+    private pendingInvoices: IInvoice[];
+    private unconfirmedTranscations: IInvoice[];
+    private sock: Subscriber;
+
+    constructor() {
+        this.unconfirmedTranscations = [];
+        this.pendingInvoices = [];
+
+        // Get all pending transcations
+        Invoice.find({ status: PaymentStatus.PENDING }).then(invoices => {
+            this.pendingInvoices = invoices;
+        });
+
+        // Get all unconfirmed transactions
+        Invoice.find({ status: PaymentStatus.UNCONFIRMED }).then(invoices => {
+            this.unconfirmedTranscations = invoices;
+        });
+
+        this.sock = new Subscriber();
+        this.sock.connect('tcp://127.0.0.1:29000');
+        this.listen();
+        this.watchConfirmations();
+    }
+
+    addInvoice(invoice: IInvoice) {
+        logger.info(`A new invoice has been created: ${invoice.id}`)
+        this.pendingInvoices.push(invoice);
+    }
+
+    /**
+     * This function waits for Bitcoin Core to respond with raw TX.
+     */
+    private async listen() {        
+        this.sock.subscribe('rawtx');
+
+        logger.info('Now listing for incoming transaction to any invoices ...');
+        for await (const [topic, msg] of this.sock) {
+            const rawtx = msg.toString('hex');
+            logger.debug(`New tx: ${rawtx}`);
+            rpcClient.request('decoderawtransaction', [rawtx], (err, decoded) => {
+                if (err) {
+                    logger.error(`Error while decoding raw tx: ${err.message}`);
+                    return;
+                }
+
+                decoded.result.vout.forEach(output => {
+                    //console.log('Output:', output.scriptPubKey);
+                    
+                    // Loop over each output and check if the address of one matches the one of an invoice.
+                    this.pendingInvoices.forEach(invoice => {
+                        // We found our transaction
+                        if (output.scriptPubKey.addresses === undefined) return;    // Sometimes (weird) transaction don't have any addresses
+                        if (output.scriptPubKey.addresses.indexOf(invoice.receiveAddress) !== -1) {
+                            logger.info(`Transcation for invoice ${invoice.id} received! (${decoded.result.hash})`);
+
+                            // Change state in database
+                            invoice.status = PaymentStatus.UNCONFIRMED;
+                            invoice.transcationHash = decoded.result.txid;
+                            invoice.save();
+
+                            // Push to array & remove from pending
+                            this.unconfirmedTranscations.push(invoice);
+                            this.pendingInvoices.splice(this.pendingInvoices.indexOf(invoice), 1);
+                        }
+                    })
+                });                
+            });
+            
+        }
+    }
+
+    /**
+     * This functions loops over each unconfirmed transaction to check if it reached "trusted" threshold.
+     */
+    private watchConfirmations() {
+        setInterval(() => {
+            this.unconfirmedTranscations.forEach(invoice => {
+                rpcClient.request('gettransaction', [invoice.transcationHash], (err, message) => {
+                    if (err) {
+                        logger.error(`Error while fetching confirmation state of ${invoice.transcationHash}: ${err.message}`);
+                        return;
+                    }
+
+                    if (Number(message.result.confirmations) > 2) {
+                        logger.info(`Transaction (${invoice.transcationHash}) has reached more then 2 confirmations and can now be trusted!`);
+                        invoice.status = PaymentStatus.DONE;
+                        invoice.save(); // This will trigger a post save hook that will notify the user.
+
+                        this.unconfirmedTranscations.splice(this.unconfirmedTranscations.indexOf(invoice), 1);
+                    } else {
+                        logger.debug(`Transcation (${invoice.transcationHash}) has not reached his threshold yet.`);
+                    }
+                });
+            });
+        }, 2_000);
+    }
+}

src/helper/types.ts

@@ -1,5 +1,6 @@
 export enum CryptoUnits {
     BITCOIN = 'BTC',
+    BITCOINCASH = 'BCH',
     ETHEREUM = 'ETH',
     LITECOIN = 'LTC',
     DOGECOIN = 'DOGE',
@@ -26,11 +27,4 @@ export enum PaymentStatus {
      * The payment is completed and the crypto is now available.
      */
     DONE = 2
-}
-
-export interface SellItem {
-    price: {
-        unit: number,
-        currency: 
-    }
 }

src/models/invoice/invoice.interface.ts

@@ -0,0 +1,42 @@
+import { Document } from 'mongoose';
+import { CryptoUnits, FiatUnits, PaymentStatus } from '../../helper/types';
+
+export interface ICart {
+    price: number;
+    name: string;
+    image: string;
+    quantity: number;
+}
+
+export interface IInvoice extends Document {
+    // Available payment methods
+    // [btc, xmr, eth, doge]
+    paymentMethods: CryptoUnits[];
+
+    // 1Kss3e9iPB9vTgWJJZ1SZNkkFKcFJXPz9t
+    receiveAddress: string;
+
+    paidWith?: CryptoUnits;
+
+    // Is set when invoice got paid
+    // 3b38c3a215d4e7981e1516b2dcbf76fca58911274d5d55b3d615274d6e10f2c1
+    transcationHash?: string;
+
+    cart?: ICart[];
+    totalPrice?: number;
+    currency: FiatUnits;
+    
+    // Time in minutes the user has to pay.
+    // Time left = (createdAt + dueBy) - Date.now() / 1000
+    dueBy: number;
+
+    status?: PaymentStatus;
+
+    // E-Mail address of user, if he want's a confirmation email.
+    email?: string;
+
+    successUrl: string;
+    cancelUrl: string;
+
+    createdAt?: number;
+}

src/models/invoice/invoice.model.ts

@@ -0,0 +1,6 @@
+import { Model, model } from 'mongoose';
+import { IInvoice } from './invoice.interface';
+import { schemaInvoice } from './invoice.schema';
+
+const modelInvoice: Model<IInvoice> = model<IInvoice>('Invoice', schemaInvoice , 'Invoice');
+export { modelInvoice as Invoice };

src/models/invoice/invoice.schema.ts

@@ -0,0 +1,58 @@
+import { NativeError, Schema, SchemaTypes } from 'mongoose';
+import { CryptoUnits, FiatUnits, PaymentStatus } from '../../helper/types';
+import { IInvoice } from './invoice.interface';
+
+const urlRegex = /((([A-Za-z]{3,9}:(?:\/\/)?)(?:[\-;:&=\+\$,\w]+@)?[A-Za-z0-9\.\-]+|(?:www\.|[\-;:&=\+\$,\w]+@)[A-Za-z0-9\.\-]+)((?:\/[\+~%\/\.\w\-_]*)?\??(?:[\-\+=&;%@\.\w_]*)#?(?:[\.\!\/\\\w]*))?)/
+
+const schemaCart = new Schema({
+    price: { type: Number, required: true },
+    name: { type: String, trim: true, required: true },
+    image: { type: String, match: urlRegex, required: true },
+    quantity: { type: Number, default: 1 }
+})
+
+const schemaInvoice = new Schema({
+    paymentMethods: [{ type: String, enum: Object.values(CryptoUnits), default: [CryptoUnits.BITCOIN], required: true }],
+    receiveAddress: { type: String, required: true },
+    paidWith: { type: String, enum: CryptoUnits },
+    transcationHash: { type: String, required: false },
+    cart: [{ type: schemaCart, required: false }],
+    totalPrice: { type: Number, required: false },
+    currency: { type: String, enum: Object.values(FiatUnits), required: false },
+    dueBy: { type: Number, required: true },
+    status: { type: Number, enum: Object.values(PaymentStatus), default: PaymentStatus.PENDING },
+    email: { type: String, required: false },
+    successUrl: { type: String, match: urlRegex, required: false },
+    cancelUrl: { type: String, match: urlRegex, required: false }
+}, {
+    timestamps: {
+        createdAt: true,
+    },
+    versionKey: false
+});
+
+// Validate values
+schemaInvoice.post('validate', function (res, next) {
+    let self = this as IInvoice;
+    
+    // If cart is undefined and price too, error.
+    if ((self.cart === undefined || self.cart.length === 0) && self.totalPrice === undefined) {
+        next(new Error('Either cart or price has to be defined!'));
+        return;
+    }
+
+    // If cart is provided, calculate price.
+    if (self.cart !== undefined && self.totalPrice === undefined) {
+        let totalPrice = 0;
+        
+        for (let i = 0; i < self.cart.length; i++) {
+            const item = self.cart[i];
+            totalPrice += item.price * item.quantity;
+        }
+
+        self.set({ totalPrice });
+    }
+    next();
+})
+
+export { schemaInvoice }

src/models/user/user.interface.ts

@@ -0,0 +1,10 @@
+import { Document } from 'mongoose';
+
+export interface IUser extends Document {
+    name: string,
+    password: string,
+    salt: string,
+    lastLogin: Date,
+    twoFASecret?: string,
+    createdAt?: Date
+}

src/models/user/user.model.ts

@@ -0,0 +1,6 @@
+import { Model, model } from 'mongoose';
+import { IUser } from "./user.interface";
+import { schemaUser } from './user.schema';
+
+const modelUser: Model<IUser> = model<IUser>('User', schemaUser , 'User');
+export { modelUser as User };

src/models/user/user.schema.ts

@@ -0,0 +1,15 @@
+import { Schema } from 'mongoose';
+
+const schemaUser = new Schema({
+    name: { type: String, required: true },
+    password: { type: String, required: true },
+    salt: { type: String, required: true },
+    twoFASecret: { type: String, required: false },
+    lastLogin: { type: Date, required: true, default: Date.now },
+}, {
+    timestamps: {
+        createdAt: true
+    }
+});
+
+export { schemaUser }

src/routes/invoice.ts

@@ -1,8 +1,9 @@
 import { Router } from "express";
+import { createInvoice } from "../controllers/invoice";
 
 const invoiceRouter = Router()
 
 invoiceRouter.get('/:id');
-invoiceRouter.post('/');
+invoiceRouter.post('/', createInvoice);
 
 export { invoiceRouter };