├── .env
├── .env.development
├── .env.production
├── .gitignore
├── CONTRIBUTING.md
├── README.md
├── certbot.ini
├── package-lock.json
├── package.json
├── pm2.json
├── src
    ├── Server.ts
    ├── config
    │   ├── constants.ts
    │   ├── environments.ts
    │   └── paths.ts
    ├── controllers
    │   ├── AlgorithmsController.ts
    │   ├── AuthController.ts
    │   ├── Controller.ts
    │   ├── TracersController.ts
    │   ├── VisualizationsController.ts
    │   └── index.ts
    ├── index.ts
    ├── middlewares
    │   ├── errorHandlerMiddleware.ts
    │   ├── frontendMiddleware.ts
    │   ├── index.ts
    │   └── redirectMiddleware.ts
    ├── models
    │   ├── Algorithm.ts
    │   ├── Category.ts
    │   ├── File.ts
    │   ├── Hierarchy.ts
    │   └── index.ts
    ├── tracers
    │   ├── DockerTracer.ts
    │   ├── LambdaTracer.ts
    │   ├── Tracer.ts
    │   ├── cpp
    │   │   ├── CppTracer.ts
    │   │   └── Dockerfile
    │   ├── index.ts
    │   ├── java
    │   │   └── JavaTracer.ts
    │   └── js
    │   │   ├── JsTracer.ts
    │   │   └── worker.js
    └── utils
    │   ├── apis.ts
    │   ├── hierarchy.ts
    │   └── misc.ts
├── tsconfig.json
└── tslint.json


/.env:
--------------------------------------------------------------------------------
1 | HTTP_PORT = 8080
2 | HTTPS_PORT = 8443
3 | 


--------------------------------------------------------------------------------
/.env.development:
--------------------------------------------------------------------------------
1 | CREDENTIALS_ENABLED = 0
2 | WEBHOOK_ENABLED = 0
3 | 


--------------------------------------------------------------------------------
/.env.production:
--------------------------------------------------------------------------------
1 | CREDENTIALS_ENABLED = 1
2 | CREDENTIALS_PATH = /home/ubuntu/.certbot/config/live/algorithm-visualizer.org
3 | CREDENTIALS_CA = fullchain.pem
4 | CREDENTIALS_KEY = privkey.pem
5 | CREDENTIALS_CERT = cert.pem
6 | WEBHOOK_ENABLED = 1
7 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # WebStorm settings
 2 | /.idea
 3 | 
 4 | # npm
 5 | /node_modules
 6 | /npm-debug.log
 7 | 
 8 | # macOS
 9 | .DS_Store
10 | 
11 | # local .env* files
12 | .env.local
13 | .env.*.local
14 | 
15 | # downloaded files
16 | /public
17 | 


--------------------------------------------------------------------------------
/CONTRIBUTING.md:
--------------------------------------------------------------------------------
 1 | # Contributing
 2 | 
 3 | > #### Table of Contents
 4 | > - [Running Locally](#running-locally)
 5 | > - [Directory Structure](#directory-structure)
 6 | 
 7 | Are you a first-timer in contributing to open source? [These guidelines](https://opensource.guide/how-to-contribute/#how-to-submit-a-contribution) from GitHub might help!
 8 | 
 9 | ## Running Locally
10 | 
11 | 1. Fork this repository.
12 | 
13 | 2. Clone your forked repo to your machine.
14 | 
15 |     ```bash
16 |     git clone https://github.com/<your-username>/server.git    
17 |     ```
18 | 
19 | 3. Install [Docker](https://docs.docker.com/install/), if not done already.
20 | 
21 | 4. Create `.env.local` in the project root:
22 |     ```bash
23 |     # By putting dummy values, GitHub sign in will not work locally
24 |     GITHUB_CLIENT_ID = dummy
25 |     GITHUB_CLIENT_SECRET = dummy
26 | 
27 |     # By putting dummy values, extracting visualizing commands will not work locally (except for JavaScript).
28 |     AWS_ACCESS_KEY_ID = dummy
29 |     AWS_SECRET_ACCESS_KEY = dummy
30 |     ```
31 | 
32 | 5. Install dependencies, and run the server.
33 | 
34 |     ```bash
35 |     cd server
36 | 
37 |     npm install
38 |     
39 |     npm run watch
40 |     ```
41 |     
42 | 6. Open [`http://localhost:8080/`](http://localhost:8080/) in a web browser.
43 | 
44 | ## Directory Structure
45 | 
46 | - [**src/**](src) contains source code. 
47 |     - [**config/**](src/config) contains configuration files.
48 |     - [**controllers/**](src/controllers) routes and processes incoming requests.
49 |     - [**middlewares/**](src/middlewares) contains Express middlewares.
50 |     - [**models/**](src/models) manages algorithm visualizations and their hierarchy.
51 |     - [**tracers/**](src/tracers) build visualization libraries and compiles/runs code.
52 |     - [**utils/**](src/utils) contains utility files.
53 | 
54 | **NOTE** that for JavaScript, it builds a web worker rather than a docker image. Once a browser fetches the web worker, it will submit users' code to the web worker locally, instead of submitting to the remote server, to extract visualizing commands.
55 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Server
 2 | 
 3 | > This repository is part of the project [Algorithm Visualizer](https://github.com/algorithm-visualizer).
 4 | 
 5 | `server` serves [`algorithm-visualizer`](https://github.com/algorithm-visualizer/algorithm-visualizer) and provides APIs that the web app needs on the fly. (e.g., GitHub sign in, compiling/running code, etc.)
 6 | 
 7 | ## Contributing
 8 | 
 9 | Check out the [contributing guidelines](https://github.com/algorithm-visualizer/server/blob/master/CONTRIBUTING.md).
10 | 


--------------------------------------------------------------------------------
/certbot.ini:
--------------------------------------------------------------------------------
1 | config-dir = /home/ubuntu/.certbot/config
2 | work-dir = /home/ubuntu/.certbot/work
3 | logs-dir = /home/ubuntu/.certbot/logs
4 | email = parkjs814@gmail.com
5 | authenticator = webroot
6 | webroot-path = /home/ubuntu/server/public/frontend-built
7 | domains = algorithm-visualizer.org
8 | 


--------------------------------------------------------------------------------
/package-lock.json:
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1470 |       "integrity": "sha512-yOg9nMAi6U2HcAkhnFuWxfg53XDqpdbeBESo+7DfmlDpQX4RrEzBNV6szOjlm/OH0KiRgG5J0emvg/BS/gQmXQ==",
1471 |       "dev": true,
1472 |       "requires": {
1473 |         "dateformat": "~1.0.4-1.2.3",
1474 |         "dynamic-dedupe": "^0.3.0",
1475 |         "filewatcher": "~3.0.0",
1476 |         "minimist": "^1.1.3",
1477 |         "mkdirp": "^0.5.1",
1478 |         "node-notifier": "^5.4.0",
1479 |         "resolve": "^1.0.0",
1480 |         "rimraf": "^2.6.1",
1481 |         "tree-kill": "^1.2.1",
1482 |         "ts-node": "*",
1483 |         "tsconfig": "^7.0.0"
1484 |       }
1485 |     },
1486 |     "tsconfig": {
1487 |       "version": "7.0.0",
1488 |       "resolved": "https://registry.npmjs.org/tsconfig/-/tsconfig-7.0.0.tgz",
1489 |       "integrity": "sha512-vZXmzPrL+EmC4T/4rVlT2jNVMWCi/O4DIiSj3UHg1OE5kCKbk4mfrXc6dZksLgRM/TZlKnousKH9bbTazUWRRw==",
1490 |       "dev": true,
1491 |       "requires": {
1492 |         "@types/strip-bom": "^3.0.0",
1493 |         "@types/strip-json-comments": "0.0.30",
1494 |         "strip-bom": "^3.0.0",
1495 |         "strip-json-comments": "^2.0.0"
1496 |       },
1497 |       "dependencies": {
1498 |         "strip-bom": {
1499 |           "version": "3.0.0",
1500 |           "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
1501 |           "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
1502 |           "dev": true
1503 |         }
1504 |       }
1505 |     },
1506 |     "tslib": {
1507 |       "version": "1.9.3",
1508 |       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
1509 |       "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ=="
1510 |     },
1511 |     "tslint": {
1512 |       "version": "5.17.0",
1513 |       "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.17.0.tgz",
1514 |       "integrity": "sha512-pflx87WfVoYepTet3xLfDOLDm9Jqi61UXIKePOuca0qoAZyrGWonDG9VTbji58Fy+8gciUn8Bt7y69+KEVjc/w==",
1515 |       "dev": true,
1516 |       "requires": {
1517 |         "@babel/code-frame": "^7.0.0",
1518 |         "builtin-modules": "^1.1.1",
1519 |         "chalk": "^2.3.0",
1520 |         "commander": "^2.12.1",
1521 |         "diff": "^3.2.0",
1522 |         "glob": "^7.1.1",
1523 |         "js-yaml": "^3.13.1",
1524 |         "minimatch": "^3.0.4",
1525 |         "mkdirp": "^0.5.1",
1526 |         "resolve": "^1.3.2",
1527 |         "semver": "^5.3.0",
1528 |         "tslib": "^1.8.0",
1529 |         "tsutils": "^2.29.0"
1530 |       },
1531 |       "dependencies": {
1532 |         "diff": {
1533 |           "version": "3.5.0",
1534 |           "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
1535 |           "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
1536 |           "dev": true
1537 |         }
1538 |       }
1539 |     },
1540 |     "tsutils": {
1541 |       "version": "2.29.0",
1542 |       "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.29.0.tgz",
1543 |       "integrity": "sha512-g5JVHCIJwzfISaXpXE1qvNalca5Jwob6FjI4AoPlqMusJ6ftFE7IkkFoMhVLRgK+4Kx3gkzb8UZK5t5yTTvEmA==",
1544 |       "dev": true,
1545 |       "requires": {
1546 |         "tslib": "^1.8.1"
1547 |       }
1548 |     },
1549 |     "type-is": {
1550 |       "version": "1.6.18",
1551 |       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
1552 |       "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
1553 |       "requires": {
1554 |         "media-typer": "0.3.0",
1555 |         "mime-types": "~2.1.24"
1556 |       }
1557 |     },
1558 |     "typescript": {
1559 |       "version": "3.5.1",
1560 |       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.5.1.tgz",
1561 |       "integrity": "sha512-64HkdiRv1yYZsSe4xC1WVgamNigVYjlssIoaH2HcZF0+ijsk5YK2g0G34w9wJkze8+5ow4STd22AynfO6ZYYLw=="
1562 |     },
1563 |     "universalify": {
1564 |       "version": "0.1.2",
1565 |       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
1566 |       "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
1567 |     },
1568 |     "unpipe": {
1569 |       "version": "1.0.0",
1570 |       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
1571 |       "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
1572 |     },
1573 |     "url": {
1574 |       "version": "0.10.3",
1575 |       "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz",
1576 |       "integrity": "sha1-Ah5NnHcF8hu/N9A861h2dAJ3TGQ=",
1577 |       "requires": {
1578 |         "punycode": "1.3.2",
1579 |         "querystring": "0.2.0"
1580 |       }
1581 |     },
1582 |     "utils-merge": {
1583 |       "version": "1.0.1",
1584 |       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
1585 |       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
1586 |     },
1587 |     "uuid": {
1588 |       "version": "3.3.2",
1589 |       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
1590 |       "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
1591 |     },
1592 |     "validate-npm-package-license": {
1593 |       "version": "3.0.4",
1594 |       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
1595 |       "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
1596 |       "dev": true,
1597 |       "requires": {
1598 |         "spdx-correct": "^3.0.0",
1599 |         "spdx-expression-parse": "^3.0.0"
1600 |       }
1601 |     },
1602 |     "vary": {
1603 |       "version": "1.1.2",
1604 |       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
1605 |       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
1606 |     },
1607 |     "which": {
1608 |       "version": "1.3.1",
1609 |       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
1610 |       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
1611 |       "dev": true,
1612 |       "requires": {
1613 |         "isexe": "^2.0.0"
1614 |       }
1615 |     },
1616 |     "wrappy": {
1617 |       "version": "1.0.2",
1618 |       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
1619 |       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
1620 |       "dev": true
1621 |     },
1622 |     "xml2js": {
1623 |       "version": "0.4.19",
1624 |       "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.19.tgz",
1625 |       "integrity": "sha512-esZnJZJOiJR9wWKMyuvSE1y6Dq5LCuJanqhxslH2bxM6duahNZ+HMpCLhBQGZkbX6xRf8x1Y2eJlgt2q3qo49Q==",
1626 |       "requires": {
1627 |         "sax": ">=0.6.0",
1628 |         "xmlbuilder": "~9.0.1"
1629 |       }
1630 |     },
1631 |     "xmlbuilder": {
1632 |       "version": "9.0.7",
1633 |       "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.7.tgz",
1634 |       "integrity": "sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0="
1635 |     },
1636 |     "xtend": {
1637 |       "version": "4.0.1",
1638 |       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
1639 |       "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
1640 |       "dev": true
1641 |     },
1642 |     "yn": {
1643 |       "version": "3.1.0",
1644 |       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.0.tgz",
1645 |       "integrity": "sha512-kKfnnYkbTfrAdd0xICNFw7Atm8nKpLcLv9AZGEt+kczL/WQVai4e2V6ZN8U/O+iI6WrNuJjNNOyu4zfhl9D3Hg=="
1646 |     }
1647 |   }
1648 | }
1649 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "@algorithm-visualizer/server",
 3 |   "version": "2.0.0",
 4 |   "title": "Algorithm Visualizer",
 5 |   "description": "Algorithm Visualizer is an interactive online platform that visualizes algorithms from code.",
 6 |   "scripts": {
 7 |     "watch": "NODE_ENV=development NODE_PATH=src ts-node-dev --respawn --ignore-watch node_modules --no-notify src",
 8 |     "start": "NODE_ENV=production NODE_PATH=src ts-node --transpile-only src",
 9 |     "tslint": "tslint -c tslint.json -p tsconfig.json"
10 |   },
11 |   "repository": {
12 |     "type": "git",
13 |     "url": "git+https://github.com/algorithm-visualizer/server.git"
14 |   },
15 |   "license": "MIT",
16 |   "devDependencies": {
17 |     "@types/compression": "0.0.36",
18 |     "@types/execa": "^0.9.0",
19 |     "@types/express": "^4.16.1",
20 |     "@types/fs-extra": "^7.0.0",
21 |     "@types/morgan": "^1.7.35",
22 |     "@types/node": "^12.0.0",
23 |     "@types/node-cron": "^3.0.1",
24 |     "@types/remove-markdown": "^0.1.1",
25 |     "@types/uuid": "^3.4.4",
26 |     "ts-node-dev": "^1.0.0-pre.39",
27 |     "tslint": "^5.16.0"
28 |   },
29 |   "dependencies": {
30 |     "aws-sdk": "^2.814.0",
31 |     "axios": "^0.21.2",
32 |     "body-parser": "^1.18.2",
33 |     "compression": "^1.7.3",
34 |     "dotenv": "^8.0.0",
35 |     "dotenv-flow": "^2.0.0",
36 |     "express": "^4.16.4",
37 |     "express-github-webhook": "^1.0.6",
38 |     "fs-extra": "^6.0.1",
39 |     "morgan": "^1.9.1",
40 |     "node-cron": "^3.0.0",
41 |     "remove-markdown": "^0.3.0",
42 |     "ts-httpexceptions": "^4.1.0",
43 |     "ts-node": "^8.1.0",
44 |     "typescript": "^3.4.5",
45 |     "uuid": "^3.3.2"
46 |   }
47 | }
48 | 


--------------------------------------------------------------------------------
/pm2.json:
--------------------------------------------------------------------------------
1 | {
2 |   "apps": [
3 |     {
4 |       "name": "algorithm-visualizer",
5 |       "script": "npm start"
6 |     }
7 |   ]
8 | }
9 | 


--------------------------------------------------------------------------------
/src/Server.ts:
--------------------------------------------------------------------------------
  1 | import express, { NextFunction, Request, Response } from 'express';
  2 | import morgan from 'morgan';
  3 | import bodyParser from 'body-parser';
  4 | import * as Controllers from 'controllers';
  5 | import { NotFound } from 'ts-httpexceptions';
  6 | import compression from 'compression';
  7 | import { __PROD__, credentials, httpPort, httpsPort, webhookOptions } from 'config/environments';
  8 | import http from 'http';
  9 | import https from 'https';
 10 | import cron from 'node-cron';
 11 | import { Hierarchy } from 'models';
 12 | import * as Tracers from 'tracers';
 13 | import { errorHandlerMiddleware, frontendMiddleware, redirectMiddleware } from 'middlewares';
 14 | import { execute, issueHttpsCertificate, pull } from 'utils/misc';
 15 | import { frontendBuildDir, frontendBuiltDir, frontendDir, rootDir } from 'config/paths';
 16 | 
 17 | const Webhook = require('express-github-webhook');
 18 | 
 19 | export default class Server {
 20 |   readonly hierarchy = new Hierarchy();
 21 |   readonly tracers = Object.values(Tracers).map(Tracer => new Tracer());
 22 |   private readonly app = express();
 23 |   private readonly webhook = webhookOptions && Webhook(webhookOptions);
 24 | 
 25 |   constructor() {
 26 |     this.app
 27 |       .use(compression())
 28 |       .use(morgan(__PROD__ ? 'tiny' : 'dev'))
 29 |       .use(redirectMiddleware())
 30 |       .use(bodyParser.json())
 31 |       .use(bodyParser.urlencoded({ extended: true }))
 32 |       .use('/api', this.getApiRouter())
 33 |       .use(frontendMiddleware(this));
 34 |     if (this.webhook) {
 35 |       this.app.use(this.webhook);
 36 |     }
 37 |     this.app.use(errorHandlerMiddleware());
 38 | 
 39 |     if (this.webhook) {
 40 |       this.webhook.on('push', async (repo: string, data: any) => {
 41 |         const { ref, head_commit } = data;
 42 |         if (ref !== 'refs/heads/master') return;
 43 |         if (!head_commit) throw new Error('The `head_commit` is empty.');
 44 | 
 45 |         switch (repo) {
 46 |           case 'server':
 47 |             await this.update(head_commit.id);
 48 |             break;
 49 |           case 'algorithm-visualizer':
 50 |             await this.updateFrontend(head_commit.id);
 51 |             break;
 52 |           case 'algorithms':
 53 |             await this.hierarchy.update(head_commit.id);
 54 |             break;
 55 |           default:
 56 |             throw new Error(`Webhook from unknown repository '${repo}'.`);
 57 |         }
 58 |       });
 59 | 
 60 |       this.webhook.on('release', async (repo: string, data: any) => {
 61 |         const tracer = this.tracers.find(tracer => repo === `tracers.${tracer.lang}`);
 62 |         if (!tracer) throw new Error(`Tracer not found for repository '${repo}'.`);
 63 |         await tracer.update(data.release);
 64 |       });
 65 |     }
 66 | 
 67 |     if (credentials) {
 68 |       cron.schedule('0 0 1 * *', () => {
 69 |         issueHttpsCertificate();
 70 |       });
 71 |     }
 72 |   }
 73 | 
 74 |   getApiRouter() {
 75 |     const router = express.Router();
 76 |     Object.values(Controllers).forEach(Controller => new Controller(this).route(router));
 77 |     router.use((req: Request, res: Response, next: NextFunction) => {
 78 |       next(new NotFound('API not found.'));
 79 |     });
 80 |     return router;
 81 |   };
 82 | 
 83 |   async update(commit?: string) {
 84 |     await pull(rootDir, 'server', commit);
 85 |     await execute('npm install', {
 86 |       cwd: rootDir,
 87 |       stdout: process.stdout,
 88 |       stderr: process.stderr,
 89 |     });
 90 |     process.exit(0);
 91 |   };
 92 | 
 93 |   async updateFrontend(commit?: string) {
 94 |     await pull(frontendDir, 'algorithm-visualizer', commit);
 95 |     await execute([
 96 |       'npm install',
 97 |       'npm run build',
 98 |       `rm -rf ${frontendBuiltDir}`,
 99 |       `mv ${frontendBuildDir} ${frontendBuiltDir}`,
100 |     ].join(' && '), {
101 |       cwd: frontendDir,
102 |       stdout: process.stdout,
103 |       stderr: process.stderr,
104 |     });
105 |   }
106 | 
107 |   start() {
108 |     const httpServer = http.createServer(this.app);
109 |     httpServer.listen(httpPort);
110 |     console.info(`http: listening on port ${httpPort}`);
111 | 
112 |     if (credentials) {
113 |       const httpsServer = https.createServer(credentials, this.app);
114 |       httpsServer.listen(httpsPort);
115 |       console.info(`https: listening on port ${httpsPort}`);
116 |     }
117 |   }
118 | }
119 | 


--------------------------------------------------------------------------------
/src/config/constants.ts:
--------------------------------------------------------------------------------
1 | export const memoryLimit = 256; // in megabytes
2 | export const timeLimit = 5000; // in milliseconds
3 | 


--------------------------------------------------------------------------------
/src/config/environments.ts:
--------------------------------------------------------------------------------
 1 | import fs from 'fs';
 2 | import { ServerOptions } from 'https';
 3 | import path from 'path';
 4 | import { issueHttpsCertificate } from '../utils/misc';
 5 | 
 6 | require('dotenv-flow').config();
 7 | 
 8 | const {
 9 |   NODE_ENV,
10 | 
11 |   HTTP_PORT,
12 |   HTTPS_PORT,
13 | 
14 |   CREDENTIALS_ENABLED,
15 |   CREDENTIALS_PATH,
16 |   CREDENTIALS_CA,
17 |   CREDENTIALS_KEY,
18 |   CREDENTIALS_CERT,
19 | 
20 |   WEBHOOK_ENABLED,
21 |   WEBHOOK_SECRET,
22 | 
23 |   GITHUB_CLIENT_ID,
24 |   GITHUB_CLIENT_SECRET,
25 | 
26 |   AWS_ACCESS_KEY_ID,
27 |   AWS_SECRET_ACCESS_KEY,
28 | } = process.env as {
29 |   [key: string]: string,
30 | };
31 | 
32 | const isEnabled = (v: string) => v === '1';
33 | 
34 | const missingVars = [
35 |   'NODE_ENV',
36 |   'HTTP_PORT',
37 |   'HTTPS_PORT',
38 |   'CREDENTIALS_ENABLED',
39 |   ...(isEnabled(CREDENTIALS_ENABLED) ? [
40 |     'CREDENTIALS_PATH',
41 |     'CREDENTIALS_CA',
42 |     'CREDENTIALS_KEY',
43 |     'CREDENTIALS_CERT',
44 |   ] : []),
45 |   'WEBHOOK_ENABLED',
46 |   ...(isEnabled(WEBHOOK_ENABLED) ? [
47 |     'WEBHOOK_SECRET',
48 |   ] : []),
49 |   'GITHUB_CLIENT_ID',
50 |   'GITHUB_CLIENT_SECRET',
51 |   'AWS_ACCESS_KEY_ID',
52 |   'AWS_SECRET_ACCESS_KEY',
53 | ].filter(variable => process.env[variable] === undefined);
54 | if (missingVars.length) throw new Error(`The following environment variables are missing: ${missingVars.join(', ')}`);
55 | 
56 | export const __PROD__ = NODE_ENV === 'production';
57 | export const __DEV__ = NODE_ENV === 'development';
58 | 
59 | export const httpPort = parseInt(HTTP_PORT);
60 | export const httpsPort = parseInt(HTTPS_PORT);
61 | 
62 | export const webhookOptions = isEnabled(WEBHOOK_ENABLED) ? {
63 |   path: '/webhook',
64 |   secret: WEBHOOK_SECRET,
65 | } : undefined;
66 | 
67 | export let credentials: ServerOptions | undefined;
68 | if (isEnabled(CREDENTIALS_ENABLED)) {
69 |   if (fs.existsSync(CREDENTIALS_PATH)) {
70 |     const readCredentials = (file: string) => fs.readFileSync(path.resolve(CREDENTIALS_PATH, file));
71 |     credentials = {
72 |       ca: readCredentials(CREDENTIALS_CA),
73 |       key: readCredentials(CREDENTIALS_KEY),
74 |       cert: readCredentials(CREDENTIALS_CERT),
75 |     };
76 |   } else {
77 |     issueHttpsCertificate();
78 |   }
79 | }
80 | 
81 | export const githubClientId = GITHUB_CLIENT_ID;
82 | export const githubClientSecret = GITHUB_CLIENT_SECRET;
83 | 
84 | export const awsAccessKeyId = AWS_ACCESS_KEY_ID;
85 | export const awsSecretAccessKey = AWS_SECRET_ACCESS_KEY;
86 | 


--------------------------------------------------------------------------------
/src/config/paths.ts:
--------------------------------------------------------------------------------
 1 | import path from 'path';
 2 | 
 3 | export const rootDir = path.resolve(__dirname, '..', '..');
 4 | export const publicDir = path.resolve(rootDir, 'public');
 5 | export const algorithmsDir = path.resolve(publicDir, 'algorithms');
 6 | export const codesDir = path.resolve(publicDir, 'codes');
 7 | export const visualizationsDir = path.resolve(publicDir, 'visualizations');
 8 | export const frontendDir = path.resolve(publicDir, 'frontend');
 9 | export const frontendBuildDir = path.resolve(frontendDir, 'build');
10 | export const frontendBuiltDir = path.resolve(publicDir, 'frontend-built');
11 | 


--------------------------------------------------------------------------------
/src/controllers/AlgorithmsController.ts:
--------------------------------------------------------------------------------
 1 | import express from 'express';
 2 | import { Controller } from 'controllers/Controller';
 3 | import { NotFound } from 'ts-httpexceptions';
 4 | import Server from 'Server';
 5 | 
 6 | export class AlgorithmsController extends Controller {
 7 |   constructor(server: Server) {
 8 |     super(server);
 9 |     this.router
10 |       .get('/', this.getHierarchy)
11 |       .get('/:categoryKey/:algorithmKey', this.getAlgorithm)
12 |       .get('/sitemap.txt', this.getSitemap);
13 |   }
14 | 
15 |   route = (router: express.Router): void => {
16 |     router.use('/algorithms', this.router);
17 |   };
18 | 
19 |   getHierarchy = (req: express.Request, res: express.Response) => {
20 |     res.json(this.server.hierarchy);
21 |   };
22 | 
23 |   getAlgorithm = (req: express.Request, res: express.Response, next: express.NextFunction) => {
24 |     const {categoryKey, algorithmKey} = req.params;
25 |     const algorithm = this.server.hierarchy.find(categoryKey, algorithmKey);
26 |     if (!algorithm) return next(new NotFound('Algorithm not found.'));
27 |     res.json({algorithm});
28 |   };
29 | 
30 |   getSitemap = (req: express.Request, res: express.Response) => {
31 |     const urls: string[] = [];
32 |     this.server.hierarchy.iterate((category, algorithm) => {
33 |       urls.push(`https://algorithm-visualizer.org/${category.key}/${algorithm.key}`);
34 |     });
35 |     res.set('Content-Type', 'text/plain');
36 |     res.send(urls.join('\n'));
37 |   };
38 | }
39 | 


--------------------------------------------------------------------------------
/src/controllers/AuthController.ts:
--------------------------------------------------------------------------------
 1 | import express from 'express';
 2 | import { githubClientId } from 'config/environments';
 3 | import { GitHubApi } from 'utils/apis';
 4 | import { Controller } from 'controllers/Controller';
 5 | import Server from 'Server';
 6 | 
 7 | export class AuthController extends Controller {
 8 |   constructor(server: Server) {
 9 |     super(server);
10 |     this.router
11 |       .get('/request', this.request)
12 |       .get('/response', this.response)
13 |       .get('/destroy', this.destroy);
14 |   }
15 | 
16 |   route = (router: express.Router): void => {
17 |     router.use('/auth', this.router);
18 |   };
19 | 
20 |   request = (req: express.Request, res: express.Response) => {
21 |     res.redirect(`https://github.com/login/oauth/authorize?client_id=${githubClientId}&scope=user,gist`);
22 |   };
23 | 
24 |   response = (req: express.Request, res: express.Response, next: express.NextFunction) => {
25 |     const {code} = req.query;
26 | 
27 |     GitHubApi.getAccessToken(code).then(({data}) => {
28 |       const {access_token} = data;
29 |       res.send(`<script>window.opener.signIn('${access_token}');window.close();</script>`);
30 |     }).catch(next);
31 |   };
32 | 
33 |   destroy = (req: express.Request, res: express.Response) => {
34 |     res.send(`<script>window.opener.signOut();window.close();</script>`);
35 |   };
36 | }
37 | 


--------------------------------------------------------------------------------
/src/controllers/Controller.ts:
--------------------------------------------------------------------------------
 1 | import express from "express";
 2 | import Server from 'Server';
 3 | 
 4 | export abstract class Controller {
 5 |   protected readonly router: express.Router;
 6 | 
 7 |   protected constructor(protected server: Server) {
 8 |     this.router = express.Router();
 9 |   }
10 | 
11 |   abstract route(router: express.Router): void;
12 | }
13 | 


--------------------------------------------------------------------------------
/src/controllers/TracersController.ts:
--------------------------------------------------------------------------------
 1 | import express from 'express';
 2 | import { Controller } from 'controllers/Controller';
 3 | import Server from 'Server';
 4 | 
 5 | export class TracersController extends Controller {
 6 |   constructor(server: Server) {
 7 |     super(server);
 8 |     this.server.tracers.forEach(tracer => tracer.route(this.router));
 9 |   }
10 | 
11 |   route = (router: express.Router): void => {
12 |     router.use('/tracers', this.router);
13 |   };
14 | }
15 | 


--------------------------------------------------------------------------------
/src/controllers/VisualizationsController.ts:
--------------------------------------------------------------------------------
 1 | import express from 'express';
 2 | import path from 'path';
 3 | import uuid from 'uuid';
 4 | import fs from 'fs-extra';
 5 | import { Controller } from 'controllers/Controller';
 6 | import Server from 'Server';
 7 | import { visualizationsDir } from 'config/paths';
 8 | 
 9 | export class VisualizationsController extends Controller {
10 |   constructor(server: Server) {
11 |     super(server);
12 |     this.router
13 |       .post('/', this.uploadVisualization)
14 |       .get('/:visualizationId', this.getVisualization);
15 | 
16 |     fs.remove(visualizationsDir).catch(console.error);
17 |   }
18 | 
19 |   route = (router: express.Router): void => {
20 |     router.use('/visualizations', this.router);
21 |   };
22 | 
23 |   uploadVisualization = (req: express.Request, res: express.Response, next: express.NextFunction) => {
24 |     const {content} = req.body;
25 |     const visualizationId = uuid.v4();
26 |     const visualizationPath = path.resolve(visualizationsDir, `${visualizationId}.json`);
27 |     const url = `https://algorithm-visualizer.org/scratch-paper/new?visualizationId=${visualizationId}`;
28 |     fs.outputFile(visualizationPath, content)
29 |       .then(() => res.send(url))
30 |       .catch(next);
31 |   };
32 | 
33 |   getVisualization = (req: express.Request, res: express.Response, next: express.NextFunction) => {
34 |     const {visualizationId} = req.params;
35 |     const visualizationPath = path.resolve(visualizationsDir, `${visualizationId}.json`);
36 |     res.sendFile(visualizationPath, err => {
37 |       if (err) next(new Error('Visualization Expired'));
38 |       fs.remove(visualizationPath);
39 |     });
40 |   };
41 | }
42 | 


--------------------------------------------------------------------------------
/src/controllers/index.ts:
--------------------------------------------------------------------------------
1 | export { AlgorithmsController } from './AlgorithmsController';
2 | export { AuthController } from './AuthController';
3 | export { TracersController } from './TracersController';
4 | export { VisualizationsController } from './VisualizationsController';
5 | 


--------------------------------------------------------------------------------
/src/index.ts:
--------------------------------------------------------------------------------
1 | import Server from 'Server';
2 | 
3 | new Server().start();
4 | 


--------------------------------------------------------------------------------
/src/middlewares/errorHandlerMiddleware.ts:
--------------------------------------------------------------------------------
 1 | import { NextFunction, Request, Response } from 'express';
 2 | import { Exception, InternalServerError } from 'ts-httpexceptions';
 3 | 
 4 | export function errorHandlerMiddleware() {
 5 |   return (err: any, req: Request, res: Response, next: NextFunction) => {
 6 |     if (!(err instanceof Exception)) {
 7 |       console.error(err);
 8 |       err = new InternalServerError(err.message, err);
 9 |     }
10 | 
11 |     const {message, status} = err;
12 |     res.status(status).send(message);
13 |   };
14 | }
15 | 


--------------------------------------------------------------------------------
/src/middlewares/frontendMiddleware.ts:
--------------------------------------------------------------------------------
 1 | import express, { NextFunction, Request, Response } from 'express';
 2 | import path from 'path';
 3 | import fs from 'fs-extra';
 4 | import url from 'url';
 5 | import Server from 'Server';
 6 | import { frontendBuiltDir } from 'config/paths';
 7 | 
 8 | const packageJson = require('../../package.json');
 9 | 
10 | export function frontendMiddleware(server: Server) {
11 |   const staticMiddleware = express.static(frontendBuiltDir, {index: false});
12 | 
13 |   if (!fs.pathExistsSync(frontendBuiltDir)) {
14 |     server.updateFrontend().catch(console.error);
15 |   }
16 | 
17 |   return (req: Request, res: Response, next: NextFunction) => {
18 |     staticMiddleware(req, res, err => {
19 |       if (err) return next(err);
20 |       if (req.method !== 'GET') return next();
21 | 
22 |       const filePath = path.resolve(frontendBuiltDir, 'index.html');
23 |       fs.readFile(filePath, 'utf8', (err, data) => {
24 |         if (err) return next(err);
25 | 
26 |         const {pathname} = url.parse(req.originalUrl);
27 |         if (!pathname) return next(new Error('Failed to get `pathname`.'));
28 |         const [, categoryKey, algorithmKey] = pathname.split('/');
29 |         let {title, description} = packageJson;
30 |         let algorithm = undefined;
31 |         if (categoryKey && categoryKey !== 'scratch-paper') {
32 |           algorithm = server.hierarchy.find(categoryKey, algorithmKey) || null;
33 |           if (algorithm) {
34 |             title = [algorithm.categoryName, algorithm.algorithmName].join(' - ');
35 |             description = algorithm.description;
36 |           } else {
37 |             res.status(404);
38 |             return;
39 |           }
40 |         }
41 | 
42 |         const indexFile = data
43 |           .replace(/\$TITLE/g, title)
44 |           .replace(/\$DESCRIPTION/g, description)
45 |           .replace(/\$ALGORITHM/g, algorithm === undefined ? 'undefined' :
46 |             JSON.stringify(algorithm).replace(/</g, '\\u003c'));
47 |         res.send(indexFile);
48 |       });
49 |     });
50 |   };
51 | }
52 | 


--------------------------------------------------------------------------------
/src/middlewares/index.ts:
--------------------------------------------------------------------------------
1 | export { errorHandlerMiddleware } from './errorHandlerMiddleware';
2 | export { frontendMiddleware } from './frontendMiddleware';
3 | export { redirectMiddleware } from './redirectMiddleware';
4 | 


--------------------------------------------------------------------------------
/src/middlewares/redirectMiddleware.ts:
--------------------------------------------------------------------------------
 1 | import { NextFunction, Request, Response } from 'express';
 2 | import { credentials } from 'config/environments';
 3 | 
 4 | export function redirectMiddleware() {
 5 |   return (req: Request, res: Response, next: NextFunction) => {
 6 |     if (req.hostname === 'algo-visualizer.jasonpark.me') {
 7 |       res.redirect(301, 'https://algorithm-visualizer.org/');
 8 |     } else if (credentials && !req.secure) {
 9 |       res.redirect(301, `https://${req.hostname}${req.url}`);
10 |     } else {
11 |       next();
12 |     }
13 |   };
14 | }
15 | 


--------------------------------------------------------------------------------
/src/models/Algorithm.ts:
--------------------------------------------------------------------------------
 1 | import path from 'path';
 2 | import { createKey, listFiles } from 'utils/hierarchy';
 3 | import { File } from 'models';
 4 | import { getDescription } from 'utils/misc';
 5 | 
 6 | export class Algorithm {
 7 |   key: string;
 8 |   files!: File[];
 9 |   description!: string;
10 | 
11 |   constructor(private path: string, public name: string) {
12 |     this.key = createKey(name);
13 |     this.refresh();
14 |   }
15 | 
16 |   refresh() {
17 |     this.files = listFiles(this.path)
18 |       .map(fileName => new File(path.resolve(this.path, fileName), fileName));
19 |     this.description = getDescription(this.files);
20 |   }
21 | 
22 |   toJSON() {
23 |     const {key, name} = this;
24 |     return {key, name};
25 |   }
26 | }
27 | 


--------------------------------------------------------------------------------
/src/models/Category.ts:
--------------------------------------------------------------------------------
 1 | import path from 'path';
 2 | import { createKey, listDirectories } from 'utils/hierarchy';
 3 | import { Algorithm } from 'models';
 4 | 
 5 | export class Category {
 6 |   key: string;
 7 |   algorithms!: Algorithm[];
 8 | 
 9 |   constructor(private path: string, public name: string) {
10 |     this.key = createKey(name);
11 |     this.refresh();
12 |   }
13 | 
14 |   refresh() {
15 |     this.algorithms = listDirectories(this.path)
16 |       .map(algorithmName => new Algorithm(path.resolve(this.path, algorithmName), algorithmName));
17 |   }
18 | 
19 |   toJSON() {
20 |     const {key, name, algorithms} = this;
21 |     return {key, name, algorithms};
22 |   }
23 | }
24 | 
25 | export default Category;
26 | 


--------------------------------------------------------------------------------
/src/models/File.ts:
--------------------------------------------------------------------------------
 1 | import fs from 'fs-extra';
 2 | 
 3 | export type Author = {
 4 |   login: string,
 5 |   avatar_url: string,
 6 | }
 7 | 
 8 | export class File {
 9 |   content!: string;
10 |   contributors!: Author[];
11 | 
12 |   constructor(public path: string, public name: string) {
13 |     this.refresh();
14 |   }
15 | 
16 |   refresh() {
17 |     this.content = fs.readFileSync(this.path, 'utf-8');
18 |     this.contributors = [];
19 |   }
20 | 
21 |   toJSON() {
22 |     const {name, content, contributors} = this;
23 |     return {name, content, contributors};
24 |   }
25 | }
26 | 


--------------------------------------------------------------------------------
/src/models/Hierarchy.ts:
--------------------------------------------------------------------------------
 1 | import path from 'path';
 2 | import { listDirectories } from 'utils/hierarchy';
 3 | import { GitHubApi } from 'utils/apis';
 4 | import { Algorithm, Category, File } from 'models';
 5 | import { Author } from 'models/File';
 6 | import { algorithmsDir } from 'config/paths';
 7 | import { execute, pull } from 'utils/misc';
 8 | 
 9 | type CommitAuthors = {
10 |   [sha: string]: Author,
11 | }
12 | 
13 | export class Hierarchy {
14 |   private categories!: Category[];
15 |   readonly path: string = algorithmsDir;
16 | 
17 |   constructor() {
18 |     this.refresh();
19 |     this.update().catch(console.error);
20 |   }
21 | 
22 |   refresh() {
23 |     this.categories = listDirectories(this.path)
24 |       .map(categoryName => new Category(path.resolve(this.path, categoryName), categoryName));
25 | 
26 |     const files: File[] = [];
27 |     this.categories.forEach(category => category.algorithms.forEach(algorithm => files.push(...algorithm.files)));
28 |     this.cacheCommitAuthors().then(commitAuthors => this.cacheContributors(files, commitAuthors));
29 |   }
30 | 
31 |   async update(commit?: string) {
32 |     await pull(this.path, 'algorithms', commit);
33 |     this.refresh();
34 |   };
35 | 
36 |   async cacheCommitAuthors(page = 1, commitAuthors: CommitAuthors = {}): Promise<CommitAuthors> {
37 |     const per_page = 100;
38 |     const {data} = await GitHubApi.listCommits('algorithm-visualizer', 'algorithms', {per_page, page});
39 |     const commits: any[] = data;
40 |     for (const {sha, author} of commits) {
41 |       if (!author) continue;
42 |       const {login, avatar_url} = author;
43 |       commitAuthors[sha] = {login, avatar_url};
44 |     }
45 |     if (commits.length < per_page) {
46 |       return commitAuthors;
47 |     } else {
48 |       return this.cacheCommitAuthors(page + 1, commitAuthors);
49 |     }
50 |   }
51 | 
52 |   async cacheContributors(files: File[], commitAuthors: CommitAuthors) {
53 |     for (const file of files) {
54 |       const stdout = await execute(`git --no-pager log --follow --no-merges --format="%H" -- "${path.relative(this.path, file.path)}"`, {
55 |         cwd: this.path,
56 |       });
57 |       const output = stdout.toString().replace(/\n$/, '');
58 |       const shas = output.split('\n').reverse();
59 |       const contributors: Author[] = [];
60 |       for (const sha of shas) {
61 |         const author = commitAuthors[sha];
62 |         if (author && !contributors.find(contributor => contributor.login === author.login)) {
63 |           contributors.push(author);
64 |         }
65 |       }
66 |       file.contributors = contributors;
67 |     }
68 |   }
69 | 
70 |   find(categoryKey: string, algorithmKey: string) {
71 |     const category = this.categories.find(category => category.key === categoryKey);
72 |     if (!category) return;
73 |     const algorithm = category.algorithms.find(algorithm => algorithm.key === algorithmKey);
74 |     if (!algorithm) return;
75 | 
76 |     const categoryName = category.name;
77 |     const algorithmName = algorithm.name;
78 |     const files = algorithm.files;
79 |     const description = algorithm.description;
80 | 
81 |     return {categoryKey, categoryName, algorithmKey, algorithmName, files, description};
82 |   }
83 | 
84 |   iterate(callback: (category: Category, algorithm: Algorithm) => void) {
85 |     this.categories.forEach(category => category.algorithms.forEach(algorithm => callback(category, algorithm)));
86 |   }
87 | 
88 |   toJSON() {
89 |     const {categories} = this;
90 |     return {categories};
91 |   }
92 | }
93 | 


--------------------------------------------------------------------------------
/src/models/index.ts:
--------------------------------------------------------------------------------
1 | export { Algorithm } from './Algorithm';
2 | export { Category } from './Category';
3 | export { File } from './File';
4 | export { Hierarchy } from './Hierarchy';
5 | 


--------------------------------------------------------------------------------
/src/tracers/DockerTracer.ts:
--------------------------------------------------------------------------------
 1 | import path from 'path';
 2 | import { Release, Tracer } from 'tracers/Tracer';
 3 | import express from 'express';
 4 | import uuid from 'uuid';
 5 | import fs from 'fs-extra';
 6 | import { memoryLimit, timeLimit } from 'config/constants';
 7 | import { codesDir } from 'config/paths';
 8 | import { execute } from 'utils/misc';
 9 | 
10 | export class DockerTracer extends Tracer {
11 |   private readonly directory: string;
12 |   private readonly imageName: string;
13 | 
14 |   constructor(lang: string) {
15 |     super(lang);
16 |     this.directory = path.resolve(__dirname, lang);
17 |     this.imageName = `tracer-${this.lang}`;
18 |   }
19 | 
20 |   build(release: Release) {
21 |     const {tag_name} = release;
22 |     return execute(`docker build -t ${this.imageName} . --build-arg tag_name=${tag_name}`, {
23 |       cwd: this.directory,
24 |       stdout: process.stdout,
25 |       stderr: process.stderr,
26 |     });
27 |   }
28 | 
29 |   route(router: express.Router) {
30 |     router.post(`/${this.lang}`, (req, res, next) => {
31 |       const {code} = req.body;
32 |       const tempPath = path.resolve(codesDir, uuid.v4());
33 |       fs.outputFile(path.resolve(tempPath, `Main.${this.lang}`), code)
34 |         .then(() => {
35 |           const containerName = uuid.v4();
36 |           let killed = false;
37 |           const timer = setTimeout(() => {
38 |             execute(`docker kill ${containerName}`).then(() => {
39 |               killed = true;
40 |             });
41 |           }, timeLimit);
42 |           return execute([
43 |             'docker run --rm',
44 |             `--name=${containerName}`,
45 |             '-w=/usr/visualization',
46 |             `-v=${tempPath}:/usr/visualization:rw`,
47 |             `-m=${memoryLimit}m`,
48 |             '-e ALGORITHM_VISUALIZER=1',
49 |             this.imageName,
50 |           ].join(' ')).catch(error => {
51 |             if (killed) throw new Error('Time Limit Exceeded');
52 |             throw error;
53 |           }).finally(() => clearTimeout(timer));
54 |         })
55 |         .then(() => new Promise((resolve, reject) => {
56 |           const visualizationPath = path.resolve(tempPath, 'visualization.json');
57 |           res.sendFile(visualizationPath, (err: any) => {
58 |             if (err) return reject(new Error('Visualization Not Found'));
59 |             resolve();
60 |           });
61 |         }))
62 |         .catch(next)
63 |         .finally(() => fs.remove(tempPath));
64 |     });
65 |   }
66 | }
67 | 


--------------------------------------------------------------------------------
/src/tracers/LambdaTracer.ts:
--------------------------------------------------------------------------------
 1 | import AWS from 'aws-sdk';
 2 | import express from 'express';
 3 | import { Release, Tracer } from 'tracers/Tracer';
 4 | import { awsAccessKeyId, awsSecretAccessKey } from 'config/environments';
 5 | import { BadRequest } from 'ts-httpexceptions';
 6 | 
 7 | export class LambdaTracer extends Tracer {
 8 |   static lambda = new AWS.Lambda({
 9 |     region: 'us-east-2',
10 |     accessKeyId: awsAccessKeyId,
11 |     secretAccessKey: awsSecretAccessKey,
12 |   });
13 | 
14 |   async build(release: Release) {
15 |   }
16 | 
17 |   route(router: express.Router) {
18 |     router.post(`/${this.lang}`, (req, res, next) => {
19 |       const {code} = req.body;
20 |       LambdaTracer.lambda.invoke({
21 |         FunctionName: `extractor-${this.lang}`,
22 |         InvocationType: 'RequestResponse',
23 |         Payload: JSON.stringify(code),
24 |       }, function (err, data) {
25 |         if (err) return next(err);
26 |         if (typeof data.Payload !== 'string') return next(new Error('Unexpected Payload Type'));
27 |         const payload = JSON.parse(data.Payload);
28 |         if (!payload.success) return next(new BadRequest(payload.errorMessage));
29 |         res.send(payload.commands);
30 |       });
31 |     });
32 |   }
33 | }
34 | 


--------------------------------------------------------------------------------
/src/tracers/Tracer.ts:
--------------------------------------------------------------------------------
 1 | import express from 'express';
 2 | import { GitHubApi } from 'utils/apis';
 3 | 
 4 | export type Release = {
 5 |   tag_name: string;
 6 | }
 7 | 
 8 | export abstract class Tracer {
 9 |   protected constructor(public lang: string) {
10 |     this.update().catch(console.error);
11 |   }
12 | 
13 |   abstract build(release: Release): Promise<any>;
14 | 
15 |   abstract route(router: express.Router): void;
16 | 
17 |   async update(release?: Release) {
18 |     if (release) {
19 |       return this.build(release);
20 |     }
21 |     const {data} = await GitHubApi.getLatestRelease('algorithm-visualizer', `tracers.${this.lang}`);
22 |     return this.build(data);
23 |   }
24 | }
25 | 


--------------------------------------------------------------------------------
/src/tracers/cpp/CppTracer.ts:
--------------------------------------------------------------------------------
1 | import { DockerTracer } from 'tracers/DockerTracer';
2 | 
3 | export class CppTracer extends DockerTracer {
4 |   constructor() {
5 |     super('cpp');
6 |   }
7 | }
8 | 


--------------------------------------------------------------------------------
/src/tracers/cpp/Dockerfile:
--------------------------------------------------------------------------------
 1 | FROM rikorose/gcc-cmake
 2 | 
 3 | ARG tag_name
 4 | 
 5 | RUN curl --create-dirs -o /usr/local/include/nlohmann/json.hpp -L "https://github.com/nlohmann/json/releases/download/v3.1.2/json.hpp" \
 6 |  && curl --create-dirs -o /usr/tmp/algorithm-visualizer.tar.gz -L "https://github.com/algorithm-visualizer/tracers.cpp/archive/${tag_name}.tar.gz" \
 7 |  && cd /usr/tmp \
 8 |  && mkdir algorithm-visualizer \
 9 |  && tar xvzf algorithm-visualizer.tar.gz -C algorithm-visualizer --strip-components=1 \
10 |  && cd /usr/tmp/algorithm-visualizer \
11 |  && mkdir build \
12 |  && cd build \
13 |  && cmake .. \
14 |  && make install
15 | 
16 | CMD g++ Main.cpp -o Main -O2 -std=c++11 -lcurl \
17 |  && ./Main
18 | 


--------------------------------------------------------------------------------
/src/tracers/index.ts:
--------------------------------------------------------------------------------
1 | export { CppTracer } from './cpp/CppTracer';
2 | export { JavaTracer } from './java/JavaTracer';
3 | export { JsTracer } from './js/JsTracer';
4 | 


--------------------------------------------------------------------------------
/src/tracers/java/JavaTracer.ts:
--------------------------------------------------------------------------------
1 | import { LambdaTracer } from 'tracers/LambdaTracer';
2 | 
3 | export class JavaTracer extends LambdaTracer {
4 |   constructor() {
5 |     super('java');
6 |   }
7 | }
8 | 


--------------------------------------------------------------------------------
/src/tracers/js/JsTracer.ts:
--------------------------------------------------------------------------------
 1 | import path from 'path';
 2 | import { Release, Tracer } from 'tracers/Tracer';
 3 | import express from 'express';
 4 | 
 5 | export class JsTracer extends Tracer {
 6 |   readonly workerPath: string;
 7 |   tagName?: string;
 8 | 
 9 |   constructor() {
10 |     super('js');
11 |     this.workerPath = path.resolve(__dirname, 'worker.js');
12 |   }
13 | 
14 |   async build(release: Release) {
15 |     const {tag_name} = release;
16 |     this.tagName = tag_name;
17 |   }
18 | 
19 |   route(router: express.Router) {
20 |     router.get(`/${this.lang}`, (req, res) => {
21 |       if (!this.tagName) throw new Error('JsTracer has not been built yet.');
22 |       const version = this.tagName.slice(1);
23 |       res.redirect(`https://unpkg.com/algorithm-visualizer@${version}/dist/algorithm-visualizer.umd.js`);
24 |     });
25 |     router.get(`/${this.lang}/worker`, (req, res) => res.sendFile(this.workerPath));
26 |   }
27 | }
28 | 


--------------------------------------------------------------------------------
/src/tracers/js/worker.js:
--------------------------------------------------------------------------------
 1 | const process = { env: { ALGORITHM_VISUALIZER: '1' } };
 2 | importScripts('/api/tracers/js');
 3 | 
 4 | const sandbox = code => {
 5 |   const require = name => ({ 'algorithm-visualizer': AlgorithmVisualizer }[name]); // fake require
 6 |   eval(code);
 7 | };
 8 | 
 9 | onmessage = e => {
10 |   const lines = e.data.split('\n').map((line, i) => line.replace(/(\.\s*delay\s*)\(\s*\)/g, `$1(${i})`));
11 |   const code = lines.join('\n');
12 |   sandbox(code);
13 |   postMessage(AlgorithmVisualizer.Commander.commands);
14 | };
15 | 


--------------------------------------------------------------------------------
/src/utils/apis.ts:
--------------------------------------------------------------------------------
 1 | import axios, { AxiosResponse } from 'axios';
 2 | import { githubClientId, githubClientSecret } from 'config/environments';
 3 | 
 4 | const instance = axios.create();
 5 | 
 6 | instance.interceptors.request.use(request => {
 7 |   request.params = {client_id: githubClientId, client_secret: githubClientSecret, ...request.params};
 8 |   return request;
 9 | });
10 | 
11 | const request = (url: string, process: (mappedUrl: string, args: any[]) => Promise<AxiosResponse<any>>) => {
12 |   const tokens = url.split('/');
13 |   const baseURL = /^https?:\/\//i.test(url) ? '' : 'https://api.github.com';
14 |   return (...args: any[]) => {
15 |     const mappedUrl = baseURL + tokens.map(token => token.startsWith(':') ? args.shift() : token).join('/');
16 |     return process(mappedUrl, args);
17 |   };
18 | };
19 | 
20 | const GET = (url: string) => {
21 |   return request(url, (mappedUrl: string, args: any[]) => {
22 |     const [params] = args;
23 |     return instance.get(mappedUrl, {params});
24 |   });
25 | };
26 | 
27 | const DELETE = (url: string) => {
28 |   return request(url, (mappedUrl: string, args: any[]) => {
29 |     const [params] = args;
30 |     return instance.delete(mappedUrl, {params});
31 |   });
32 | };
33 | 
34 | const POST = (url: string) => {
35 |   return request(url, (mappedUrl: string, args: any[]) => {
36 |     const [body, params] = args;
37 |     return instance.post(mappedUrl, body, {params});
38 |   });
39 | };
40 | 
41 | const PUT = (url: string) => {
42 |   return request(url, (mappedUrl: string, args: any[]) => {
43 |     const [body, params] = args;
44 |     return instance.put(mappedUrl, body, {params});
45 |   });
46 | };
47 | 
48 | const PATCH = (url: string) => {
49 |   return request(url, (mappedUrl: string, args: any[]) => {
50 |     const [body, params] = args;
51 |     return instance.patch(mappedUrl, body, {params});
52 |   });
53 | };
54 | 
55 | export const GitHubApi = {
56 |   listCommits: GET('/repos/:owner/:repo/commits'),
57 | 
58 |   getAccessToken: (code: string) => instance.post('https://github.com/login/oauth/access_token', {code}, {headers: {Accept: 'application/json'}}),
59 | 
60 |   getLatestRelease: GET('/repos/:owner/:repo/releases/latest'),
61 | };
62 | 


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/src/utils/hierarchy.ts:
--------------------------------------------------------------------------------
 1 | import path from 'path';
 2 | import fs from 'fs-extra';
 3 | 
 4 | export function createKey(name: string) {
 5 |   return name.toLowerCase().trim().replace(/[^\w \-]/g, '').replace(/ /g, '-');
 6 | }
 7 | 
 8 | export function isDirectory(dirPath: string) {
 9 |   return fs.lstatSync(dirPath).isDirectory();
10 | }
11 | 
12 | export function listFiles(dirPath: string) {
13 |   return fs.pathExistsSync(dirPath) ? fs.readdirSync(dirPath).filter(fileName => !fileName.startsWith('.')) : [];
14 | }
15 | 
16 | export function listDirectories(dirPath: string) {
17 |   return listFiles(dirPath).filter(fileName => isDirectory(path.resolve(dirPath, fileName)));
18 | }
19 | 


--------------------------------------------------------------------------------
/src/utils/misc.ts:
--------------------------------------------------------------------------------
 1 | import axios from 'axios';
 2 | import fs from 'fs-extra';
 3 | import { File } from 'models';
 4 | import removeMarkdown from 'remove-markdown';
 5 | import * as child_process from 'child_process';
 6 | import { ExecOptions, spawn } from 'child_process';
 7 | import { rootDir } from '../config/paths';
 8 | import path from 'path';
 9 | 
10 | export function download(url: string, localPath: string) {
11 |   return axios({ url, method: 'GET', responseType: 'stream' })
12 |     .then(response => new Promise((resolve, reject) => {
13 |       const writer = fs.createWriteStream(localPath);
14 |       writer.on('finish', resolve);
15 |       writer.on('error', reject);
16 |       response.data.pipe(writer);
17 |     }));
18 | }
19 | 
20 | export async function pull(dir: string, repo: string, commit = 'origin/master') {
21 |   if (fs.pathExistsSync(dir)) {
22 |     await execute(`git fetch`, {
23 |       cwd: dir,
24 |       stdout: process.stdout,
25 |       stderr: process.stderr,
26 |     });
27 |   } else {
28 |     await execute(`git clone https://github.com/algorithm-visualizer/${repo}.git ${dir}`, {
29 |       stdout: process.stdout,
30 |       stderr: process.stderr,
31 |     });
32 |   }
33 |   await execute(`git reset --hard ${commit}`, {
34 |     cwd: dir,
35 |     stdout: process.stdout,
36 |     stderr: process.stderr,
37 |   });
38 | }
39 | 
40 | export function getDescription(files: File[]) {
41 |   const readmeFile = files.find(file => file.name === 'README.md');
42 |   if (!readmeFile) return '';
43 |   const lines = readmeFile.content.split('\n');
44 |   lines.shift();
45 |   while (lines.length && !lines[0].trim()) lines.shift();
46 |   const descriptionLines = [];
47 |   while (lines.length && lines[0].trim()) descriptionLines.push(lines.shift());
48 |   return removeMarkdown(descriptionLines.join(' '));
49 | }
50 | 
51 | type ExecuteOptions = ExecOptions & {
52 |   stdout?: NodeJS.WriteStream;
53 |   stderr?: NodeJS.WriteStream;
54 | };
55 | 
56 | export function execute(command: string, { stdout, stderr, ...options }: ExecuteOptions = {}): Promise<string> {
57 |   return new Promise((resolve, reject) => {
58 |     const child = child_process.exec(command, options, (error, stdout, stderr) => {
59 |       if (error) return reject(error.code ? new Error(stderr) : error);
60 |       resolve(stdout);
61 |     });
62 |     if (child.stdout && stdout) child.stdout.pipe(stdout);
63 |     if (child.stderr && stderr) child.stderr.pipe(stderr);
64 |   });
65 | }
66 | 
67 | export function issueHttpsCertificate() {
68 |   const certbotIniPath = path.resolve(rootDir, 'certbot.ini');
69 |   const childProcess = spawn('certbot', ['certonly', '--non-interactive', '--agree-tos', '--config', certbotIniPath]);
70 |   childProcess.stdout.pipe(process.stdout);
71 |   childProcess.stderr.pipe(process.stderr);
72 |   childProcess.on('error', console.error);
73 |   childProcess.on('exit', code => {
74 |     if (code === 0) {
75 |       process.exit(0);
76 |     } else {
77 |       console.error(new Error(`certbot failed with exit code ${code}.`));
78 |     }
79 |   });
80 | }
81 | 


--------------------------------------------------------------------------------
/tsconfig.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "compilerOptions": {
 3 |     "target": "es2015",
 4 |     "lib": [
 5 |       "es2015",
 6 |       "esnext"
 7 |     ],
 8 |     "module": "commonjs",
 9 |     "moduleResolution": "node",
10 |     "esModuleInterop": true,
11 |     "experimentalDecorators": true,
12 |     "emitDecoratorMetadata": true,
13 |     "sourceMap": true,
14 |     "declaration": false,
15 |     "strict": true,
16 |     "baseUrl": "src",
17 |     "resolveJsonModule": true
18 |   },
19 |   "exclude": [
20 |     "node_modules",
21 |     "public"
22 |   ]
23 | }
24 | 


--------------------------------------------------------------------------------
/tslint.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "rules": {
 3 |     "class-name": true,
 4 |     "comment-format": [
 5 |       true,
 6 |       "check-space"
 7 |     ],
 8 |     "indent": [
 9 |       true,
10 |       "spaces",
11 |       2
12 |     ],
13 |     "one-line": [
14 |       true,
15 |       "check-open-brace",
16 |       "check-whitespace"
17 |     ],
18 |     "no-var-keyword": true,
19 |     "quotemark": [
20 |       true,
21 |       "single",
22 |       "avoid-escape"
23 |     ],
24 |     "semicolon": [
25 |       true,
26 |       "always",
27 |       "ignore-bound-class-methods"
28 |     ],
29 |     "whitespace": [
30 |       true,
31 |       "check-branch",
32 |       "check-decl",
33 |       "check-operator",
34 |       "check-module",
35 |       "check-separator",
36 |       "check-type"
37 |     ],
38 |     "typedef-whitespace": [
39 |       true,
40 |       {
41 |         "call-signature": "nospace",
42 |         "index-signature": "nospace",
43 |         "parameter": "nospace",
44 |         "property-declaration": "nospace",
45 |         "variable-declaration": "nospace"
46 |       },
47 |       {
48 |         "call-signature": "onespace",
49 |         "index-signature": "onespace",
50 |         "parameter": "onespace",
51 |         "property-declaration": "onespace",
52 |         "variable-declaration": "onespace"
53 |       }
54 |     ],
55 |     "no-internal-module": true,
56 |     "no-trailing-whitespace": true,
57 |     "no-null-keyword": true,
58 |     "prefer-const": true,
59 |     "jsdoc-format": true
60 |   }
61 | }
62 | 


--------------------------------------------------------------------------------