├── .gitignore ├── README.md ├── package-lock.json ├── package.json └── src ├── models └── db.js ├── routes ├── links.js └── redirection.js ├── server.js └── services ├── radix64-service.js └── url-service.js /.gitignore: -------------------------------------------------------------------------------- 1 | /node_modules/ -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 2 | ## Development 3 | 4 | ### Database Setup 5 | 6 | Enter PSQL for Postgres 7 | 8 | ``` 9 | # Linux 10 | sudo -u postgres psql 11 | 12 | # Mac 13 | psql postgres 14 | ``` 15 | 16 | Create Database, User and Grant Privilege 17 | 18 | Postgres 19 | ```psql 20 | create database sclrac; 21 | create user sclrac with encrypted password 'sclrac'; 22 | grant all privileges on sclrac.* to sclrac; 23 | ``` 24 | 25 | MySQL 26 | ```mysql 27 | create database sclrac; 28 | create user sclrac identified by 'sclrac'; 29 | grant all privileges on sclrac.* to sclrac; 30 | ``` -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "sclr.ac", 3 | "version": "1.0.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "@types/node": { 8 | "version": "15.6.0", 9 | "resolved": "https://registry.npmjs.org/@types/node/-/node-15.6.0.tgz", 10 | "integrity": "sha512-gCYSfQpy+LYhOFTKAeE8BkyGqaxmlFxe+n4DKM6DR0wzw/HISUE/hAmkC/KT8Sw5PCJblqg062b3z9gucv3k0A==" 11 | }, 12 | "accepts": { 13 | "version": "1.3.7", 14 | "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz", 15 | "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==", 16 | "requires": { 17 | "mime-types": "~2.1.24", 18 | "negotiator": "0.6.2" 19 | } 20 | }, 21 | "any-promise": { 22 | "version": "1.3.0", 23 | 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specified\" && exit 1" 8 | }, 9 | "author": "", 10 | "license": "ISC", 11 | "dependencies": { 12 | "express": "^4.17.1", 13 | "pg": "^8.6.0", 14 | "pg-hstore": "^2.3.3", 15 | "sequelize": "^6.6.2" 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /src/models/db.js: -------------------------------------------------------------------------------- 1 | const { Sequelize, DataTypes } = require('sequelize') 2 | 3 | const db = new Sequelize({ 4 | dialect: 'postgres', 5 | database: 'sclrac', 6 | username: 'sclrac', 7 | password: 'sclrac' 8 | }) 9 | 10 | const URLs = db.define('urls', { 11 | id: { 12 | primaryKey: true, 13 | type: DataTypes.BIGINT 14 | }, 15 | code: { 16 | type: DataTypes.STRING(7), 17 | unique: true 18 | }, 19 | link: { 20 | type: DataTypes.TEXT, 21 | allowNull: false 22 | } 23 | }) 24 | 25 | module.exports = { 26 | db, 27 | URLs 28 | } -------------------------------------------------------------------------------- /src/routes/links.js: -------------------------------------------------------------------------------- 1 | const { Router } = require("express"); 2 | const { 3 | createCustomShortCode, 4 | createRandomShortCode, 5 | findLongUrl, 6 | } = require("../services/url-service"); 7 | 8 | const route = Router(); 9 | 10 | /** 11 | * POST /api/links 12 | * BODY 13 | * link: http://xxxx.xxxx/xxxx/xxxx 14 | * --- optional --- 15 | * code: xxxxx 16 | */ 17 | route.post("/", async (req, res) => { 18 | const link = req.body.link; 19 | const code = req.body.code; 20 | // TODO: validate link must exist 21 | 22 | if (!code) { 23 | const url = await createRandomShortCode(link); 24 | return res.json(url); 25 | } 26 | 27 | try { 28 | const url = await createCustomShortCode(code, link); 29 | return res.json(url); 30 | } catch (e) { 31 | return res.status(400).json({ error: e.message }); 32 | } 33 | }); 34 | 35 | /** 36 | * GET /api/links/xxxxx 37 | * RESPONSE 38 | * link: 39 | */ 40 | route.get("/:code", async (req, res) => { 41 | const code = req.params.code; 42 | // TODO: validate code is available 43 | 44 | const url = await findLongUrl(code); 45 | 46 | if (url) { 47 | return res.json(url); 48 | } else { 49 | return res.status(404).json({ error: "No such shortcode created" }); 50 | } 51 | }); 52 | 53 | module.exports = route; 54 | -------------------------------------------------------------------------------- /src/routes/redirection.js: -------------------------------------------------------------------------------- 1 | const { Router } = require("express"); 2 | const { findLongUrl } = require("../services/url-service"); 3 | const route = Router(); 4 | 5 | route.get("/:code", async (req, res) => { 6 | const code = req.params.code; 7 | // TODO: validate code is available 8 | 9 | const url = await findLongUrl(code); 10 | 11 | if (url) { 12 | return res.redirect(url.link); 13 | } else { 14 | return res.redirect('https://scaler.com'); 15 | } 16 | }); 17 | 18 | module.exports = route; 19 | -------------------------------------------------------------------------------- /src/server.js: -------------------------------------------------------------------------------- 1 | const express = require('express') 2 | const { db } = require('./models/db') 3 | const linksRoute = require('./routes/links') 4 | const redirRoute = require('./routes/redirection') 5 | 6 | const app = express() 7 | 8 | app.use(express.json()) 9 | 10 | app.use('/api/links', linksRoute) 11 | app.use('/', redirRoute) 12 | 13 | db.sync({force: true}) // never force:true in prod, it drops dbs 14 | .then(() => console.log('db works')) 15 | .catch((err) => console.error(err)) 16 | 17 | app.listen(4445, () => { 18 | console.log('Server started on http://localhost:4445') 19 | }) -------------------------------------------------------------------------------- /src/services/radix64-service.js: -------------------------------------------------------------------------------- 1 | const ALPHABET = 2 | "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"; 3 | const CHAR_MAP = {}; 4 | 5 | ALPHABET.split("").forEach((v, i) => { 6 | CHAR_MAP[v] = i; 7 | }); 8 | 9 | function int2radix64(num) { 10 | let chars = []; 11 | let q = num; 12 | while (q > 0) { 13 | let r = q % 64; 14 | chars.push(ALPHABET.charAt(r)); 15 | q = parseInt(q / 64); 16 | } 17 | return chars.reverse().join(""); 18 | } 19 | 20 | function radix64toint(str) { 21 | let chars = str.split("").reverse(); 22 | let num = 0; 23 | for (let i = 0; i < chars.length; i++) { 24 | num += CHAR_MAP[chars[i]] * Math.pow(64, i); 25 | } 26 | return num; 27 | } 28 | 29 | module.exports = { 30 | int2radix64, 31 | radix64toint, 32 | }; 33 | -------------------------------------------------------------------------------- /src/services/url-service.js: -------------------------------------------------------------------------------- 1 | const { URLs } = require("../models/db"); 2 | const { int2radix64, radix64toint } = require("../services/radix64-service"); 3 | 4 | async function createRandomShortCode(link) { 5 | const genCode = parseInt(Math.random() * 999999999999); 6 | 7 | const exists = await URLs.findOne({ 8 | where: { 9 | id: genCode, 10 | }, 11 | }); 12 | if (exists) { 13 | // FIX: possible race condition if multiple servers vs 1 db 14 | return await createRandomShortCode(link); 15 | } 16 | return await URLs.create({ 17 | id: genCode, 18 | code: int2radix64(genCode), 19 | link: link, 20 | }); 21 | } 22 | 23 | async function createCustomShortCode(code, link) { 24 | // TODO: validate code 25 | const id = radix64toint(code); 26 | const exists = await URLs.findOne({ 27 | where: { 28 | id: id, 29 | }, 30 | }); 31 | if (exists) { 32 | throw new Error("This shortcode [" + code + "] already exists"); 33 | } 34 | return await URLs.create({ 35 | id: id, 36 | code: code, 37 | link: link, 38 | }); 39 | } 40 | 41 | async function findLongUrl(code) { 42 | const id = radix64toint(code); 43 | return await URLs.findOne({ 44 | where: { 45 | id: id, 46 | }, 47 | }); 48 | } 49 | 50 | module.exports = { 51 | createCustomShortCode, 52 | createRandomShortCode, 53 | findLongUrl, 54 | }; 55 | --------------------------------------------------------------------------------