├── .gitignore ├── Extension-Rig-Banner.png ├── LICENSE ├── README.md ├── package-lock.json ├── package.json ├── public ├── config.html ├── config.js ├── helper.js ├── jquery-3.3.1.min.js ├── live_config.html ├── panel.html ├── video_component.html ├── video_overlay.html └── viewer.js └── services └── backend.js /.gitignore: -------------------------------------------------------------------------------- 1 | # Temporary files 2 | *.sw[op] 3 | 4 | # Configuration 5 | conf/* 6 | .DS_Store 7 | # Logs 8 | logs 9 | *.log 10 | npm-debug.log* 11 | yarn-debug.log* 12 | yarn-error.log* 13 | 14 | # Runtime data 15 | pids 16 | *.pid 17 | *.seed 18 | *.pid.lock 19 | 20 | # Directory for instrumented libs generated by jscoverage/JSCover 21 | lib-cov 22 | 23 | # Coverage directory used by tools like istanbul 24 | coverage 25 | 26 | # nyc test coverage 27 | .nyc_output 28 | 29 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files) 30 | .grunt 31 | 32 | # Bower dependency directory (https://bower.io/) 33 | bower_components 34 | 35 | # node-waf configuration 36 | .lock-wscript 37 | 38 | # Compiled binary addons (http://nodejs.org/api/addons.html) 39 | build/Release 40 | 41 | # Dependency directories 42 | node_modules/ 43 | jspm_packages/ 44 | 45 | # Typescript v1 declaration files 46 | typings/ 47 | 48 | # Optional npm cache directory 49 | .npm 50 | 51 | # Optional eslint cache 52 | .eslintcache 53 | 54 | # Optional REPL history 55 | .node_repl_history 56 | 57 | # Output of 'npm pack' 58 | *.tgz 59 | 60 | # Yarn Integrity file 61 | .yarn-integrity 62 | 63 | # dotenv environment variables file 64 | .env 65 | 66 | -------------------------------------------------------------------------------- /Extension-Rig-Banner.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/twitchdev/extension-getting-started/899e0589549062f6220e4c0a7226f75428797783/Extension-Rig-Banner.png -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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The Twitch community can interact in new ways such as heat maps, real-time game data overlays, mini-games, music requests, and leaderboards. If you haven't seen an Extension, check out the [TwitchDev channel page](https://www.twitch.tv/twitchdev) and view the Twitter panel Extension below the video player. 6 | 7 | ## What Are We Building? 8 | 9 | This guide will cover the fundamentals of building your first Extension. It will allow Twitch viewers to cycle through colors via a visual element added on top of the video player (we call this a component overlay). On the frontend, a user clicks a button in this component that changes the color of a circle. Instead of changing the CSS locally, it makes a call to a backend server for a new hex value (we call this an Extension Backend Service or EBS for short). 10 | 11 | ## What's the Twitch Developer Rig? 12 | 13 | 14 | The recommended path for building this sample is with the Twitch Developer Rig. This is a native application to help with your development. The following steps will help you download, install, and set up the Rig. 15 | 16 | ## Let's Get Started! 17 | 18 | ## Setup 19 | 20 | 1. Download the Developer Rig for [Mac](https://developer-rig.twitchcdn.net/Twitch+Developer+Rig.dmg), [Windows](https://developer-rig.twitchcdn.net/Twitch+Developer+Rig+Setup.exe), or [Linux](https://developer-rig.twitchcdn.net/Twitch+Developer+Rig.AppImage). Then, open the downloaded file to install the Rig. 21 | 2. Visit the Extensions section of you [Developer Dashboard](https://dev.twitch.tv/dashboard/extensions). You will need to have a Twitch account to login and two factor authentication (2FA) will need to be activated. You will see a button prompting you with instructions if 2FA has not yet been activated. 22 | 3. Click the "Create Extension" button on this page and you will be taken to a form to setup your new Extension. 23 | 4. Make sure you select "Video - Component" under the "Type Of Extension" section, check the box to indicate that you are using the Developer Rig, and fill out the remaining fields. 24 | 5. Click "Create Extension" at the bottom of the form and you will be taken to a status page for the first version of this Extension. 25 | 6. On this page, click the "Overview" link along the top tabs. You'll see an "About This Extension" section on the right of this page (if not, you may need to widen your browser window or look for a menu icon that has a "Product Info" option). Copy and paste the `Client ID` into a text editor; you'll need this in a few steps. 26 | 7. Click the "Settings" tab and then the "Secret Keys" menu option along the left. Hover over your key, then copy and paste it into a text editor as well for the next few steps. 27 | 28 | ## Running Hello World 29 | 30 | 1. Open the Developer Rig, click "Add Project" at the top left and then "Create Project." 31 | 2. Fill in the `Client ID` and `Secret` you found in the above steps. 32 | 3. Click the "Import" button to get your Extension's information. 33 | 4. Give the project a name if it was not pulled automatically (e.g. "Hello World") and select a directory for the project files. 34 | 5. Below this, make sure "Use Existing Example" is selected. For this example, also make sure to select "Hello World" on the right side to automatically start with this repository's code. 35 | 6. Click "Save." 36 | 7. The Rig will host your frontend and backend logic for the Extension. To do this, click "Host with Rig" under "Host your front-end files." Then click "Activate" under "Back-end Run Command" to run the backend. 37 | 8. Now the app should be ready for testing! Click on "Extension Views" in the left menu. This simulates a broadcaster's channel. Let's add a component overlay view to see our Extension by clicking "Create New View." 38 | 9. Ensure the view type is "Component" and give it a label such as "main". Click "Save." 39 | 10. You should now see the Hello World Extension running on a simulated video player. Experiment with the Extension by cycling through colors with the button within the component. 40 | 41 | ## A Closer Look 42 | 43 | Now that you've built the app, let's take a look under the hood and explore how it works. 44 | 45 | ### Extension Architecture 46 | 47 | 1. Extension Frontend – comprised of HTML files for the different Extension views as well as corresponding JavaScript and CSS files. The frontend for the Hello World Extension you are currently running has the following functionality: 48 | * A button and script (`viewer.js`) that makes a POST call to the EBS to request a color change for the circle. 49 | * A GET call when the Extension is initialized to change the circle to the current color stored on the EBS. 50 | 2. Extension Backend – An EBS that performs the following functionality: 51 | * Spins up a simple HTTPS server with a POST handler for changing color. 52 | * Validates an Extension JWT. 53 | * Returns a new color using the `/cycle/color` endpoint. 54 | 55 | ### Frontend 56 | 57 | Let's dive into the frontend components. The HTML files allow this Extension to be run as any [Extension type](https://dev.twitch.tv/docs/extensions/required-technical-background/#types-of-extensions): overlay, component, or panel. In this example, we are using a component so `video_component.html` will be rendered. 58 | 59 | The frontend logic is handled by `viewer.js`. The two core functions are handling authentication and making GET/POST requests to our EBS. On first load, `twitch.onAuthorized` enables the button, sets our auth token, and dispatches the GET request to retrieve the initial color. 60 | 61 | ``` 62 | twitch.onAuthorized(function (auth) { 63 | // save our credentials 64 | token = auth.token; 65 | tuid = auth.userId; 66 | // enable the button 67 | $('#cycle').removeAttr('disabled'); 68 | setAuth(token); 69 | $.ajax(requests.get); 70 | }); 71 | ``` 72 | 73 | When the viewer presses the button, the onClick handler creates a POST request to the `/color/cycle/` endpoint. On a succesful response, `updateBlock()` is called passing the payload which contains a new hex value. `updateBlock()` simply renders the new hex value using CSS. 74 | 75 | `$('#color').css('background-color', hex);` 76 | 77 | ### Backend 78 | 79 | Our backend logic is contained in `backend.js`. Using [hapi](https://hapijs.com/), we are able to spin up a light webserver. Hapi handles hosting our GET endpoint `/color/query` and POST endpoint `/color/cycle`. These endpoints then route to either `colorCycleHandler` or `colorQueryHandler`. 80 | 81 | Hapi makes this mapping easy: 82 | 83 | ``` 84 | (async () => { 85 | // Handle a viewer request to cycle the color. 86 | server.route({ 87 | method: 'POST', 88 | path: '/color/cycle', 89 | handler: colorCycleHandler 90 | }); 91 | 92 | // Handle a new viewer requesting the color. 93 | server.route({ 94 | method: 'GET', 95 | path: '/color/query', 96 | handler: colorQueryHandler 97 | }); 98 | 99 | ``` 100 | 101 | `colorCycleHandler` and `colorQueryHandler` have similar logic, but the `colorCycleHandler` additonally produces a new hex value. First, these functions authenticate the request with `verifyAndDecode`. Then we use the `channelColors` array (indexed by `channelID`) to store hex values. After producing a new color, we save it back to the array and return the value to the frontend. 102 | 103 | ``` 104 | function colorCycleHandler (req) { 105 | // Verify all requests. 106 | const payload = verifyAndDecode(req.headers.authorization); 107 | const { channel_id: channelId, opaque_user_id: opaqueUserId } = payload; 108 | 109 | // Store the color for the channel. 110 | let currentColor = channelColors[channelId] || initialColor; 111 | 112 | // Rotate the color as if on a color wheel. 113 | verboseLog(STRINGS.cyclingColor, channelId, opaqueUserId); 114 | currentColor = color(currentColor).rotate(colorWheelRotation).hex(); 115 | 116 | // Save the new color for the channel. 117 | channelColors[channelId] = currentColor; 118 | 119 | return currentColor; 120 | } 121 | ``` 122 | 123 | ## Next Steps 124 | * Read our [Extensions documentation](https://dev.twitch.tv/docs/extensions) and continue developing with the Twitch Developer Rig. 125 | * Join our communities on [Twitter](https://twitter.com/twitchdev), [Discord](https://discordapp.com/invite/G8UQqNy) and the [Forums](https://discuss.dev.twitch.tv/) for help and to stay updated! 126 | -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "extension-hello-world", 3 | "version": "1.0.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "ajv": { 8 | "version": "5.5.2", 9 | "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz", 10 | "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=", 11 | "requires": { 12 | "co": "^4.6.0", 13 | "fast-deep-equal": "^1.0.0", 14 | "fast-json-stable-stringify": "^2.0.0", 15 | "json-schema-traverse": "^0.3.0" 16 | } 17 | }, 18 | "ammo": { 19 | "version": "3.0.3", 20 | "resolved": "https://registry.npmjs.org/ammo/-/ammo-3.0.3.tgz", 21 | "integrity": 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"resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz", 835 | "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==" 836 | }, 837 | "verror": { 838 | "version": "1.10.0", 839 | "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz", 840 | "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=", 841 | "requires": { 842 | "assert-plus": "^1.0.0", 843 | "core-util-is": "1.0.2", 844 | "extsprintf": "^1.2.0" 845 | } 846 | }, 847 | "yallist": { 848 | "version": "2.1.2", 849 | "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz", 850 | "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=" 851 | } 852 | } 853 | } 854 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "@twitchdev/extension-hello-world", 3 | "version": "1.0.0", 4 | "description": "Simple Hello World Twitch Extension", 5 | "main": "index.js", 6 | "scripts": { 7 | "cert": "node bin/generate_cert.js server", 8 | "start": "node services/backend" 9 | }, 10 | "keywords": [ 11 | "twitch", 12 | "extension" 13 | ], 14 | "author": "Emily Rose ", 15 | "license": "Apache-2.0", 16 | "dependencies": { 17 | "boom": "^7.2.0", 18 | "color": "^3.0.0", 19 | "commander": "^2.15.0", 20 | "hapi": "^17.2.2", 21 | "inert": "^5.1.0", 22 | "jsonwebtoken": "^8.2.0", 23 | "request": "^2.85.0", 24 | "selfsigned": "^1.10.2" 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /public/config.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Config Page 5 | 6 | 7 |
8 | 9 | 10 | 11 |

Configure This

12 |

Just kidding... hello world.

13 | 14 | 15 | -------------------------------------------------------------------------------- /public/config.js: -------------------------------------------------------------------------------- 1 | let token, userId; 2 | 3 | const twitch = window.Twitch.ext; 4 | 5 | twitch.onContext((context) => { 6 | twitch.rig.log(context); 7 | }); 8 | 9 | twitch.onAuthorized((auth) => { 10 | token = auth.token; 11 | userId = auth.userId; 12 | }); 13 | -------------------------------------------------------------------------------- /public/helper.js: -------------------------------------------------------------------------------- 1 | window.addEventListener('message', (event) => { 2 | console.log(event); 3 | }); 4 | //debugger; 5 | //const local = window.frameElement.attributes.getNamedItem('helperUrl'); 6 | //const online = 'https://extension-files.twitch.tv/helper/v1/twitch-ext.min.js'; 7 | //const el = document.createElement('script'); 8 | //el.src = local ? local.value : online; 9 | 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And We're Live!

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Would you care to cycle a color?

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22 | 23 | 24 | -------------------------------------------------------------------------------- /public/panel.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Viewer Page 5 | 6 | 7 |
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Hello, World!

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Would you care to cycle a color?

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22 | 23 | 24 | -------------------------------------------------------------------------------- /public/video_component.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Viewer Page 5 | 6 | 7 |
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Hello, World!

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Would you care to cycle a color?

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22 | 23 | 24 | -------------------------------------------------------------------------------- /public/video_overlay.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Viewer Page 5 | 6 | 7 |
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Hello, World!

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22 | 23 | 24 | -------------------------------------------------------------------------------- /public/viewer.js: -------------------------------------------------------------------------------- 1 | let token = ''; 2 | let tuid = ''; 3 | 4 | const twitch = window.Twitch.ext; 5 | 6 | // create the request options for our Twitch API calls 7 | const requests = { 8 | set: createRequest('POST', 'cycle'), 9 | get: createRequest('GET', 'query') 10 | }; 11 | 12 | function createRequest (type, method) { 13 | return { 14 | type: type, 15 | url: location.protocol + '//localhost:8081/color/' + method, 16 | success: updateBlock, 17 | error: logError 18 | }; 19 | } 20 | 21 | function setAuth (token) { 22 | Object.keys(requests).forEach((req) => { 23 | twitch.rig.log('Setting auth headers'); 24 | requests[req].headers = { 'Authorization': 'Bearer ' + token }; 25 | }); 26 | } 27 | 28 | twitch.onContext(function (context) { 29 | twitch.rig.log(context); 30 | }); 31 | 32 | twitch.onAuthorized(function (auth) { 33 | // save our credentials 34 | token = auth.token; 35 | tuid = auth.userId; 36 | 37 | // enable the button 38 | $('#cycle').removeAttr('disabled'); 39 | 40 | setAuth(token); 41 | $.ajax(requests.get); 42 | }); 43 | 44 | function updateBlock (hex) { 45 | twitch.rig.log('Updating block color'); 46 | $('#color').css('background-color', hex); 47 | } 48 | 49 | function logError(_, error, status) { 50 | twitch.rig.log('EBS request returned '+status+' ('+error+')'); 51 | } 52 | 53 | function logSuccess(hex, status) { 54 | twitch.rig.log('EBS request returned '+hex+' ('+status+')'); 55 | } 56 | 57 | $(function () { 58 | // when we click the cycle button 59 | $('#cycle').click(function () { 60 | if(!token) { return twitch.rig.log('Not authorized'); } 61 | twitch.rig.log('Requesting a color cycle'); 62 | $.ajax(requests.set); 63 | }); 64 | }); 65 | -------------------------------------------------------------------------------- /services/backend.js: -------------------------------------------------------------------------------- 1 | const fs = require('fs'); 2 | const Hapi = require('hapi'); 3 | const path = require('path'); 4 | const Boom = require('boom'); 5 | const color = require('color'); 6 | const ext = require('commander'); 7 | const jsonwebtoken = require('jsonwebtoken'); 8 | // const request = require('request'); 9 | 10 | // The developer rig uses self-signed certificates. Node doesn't accept them 11 | // by default. Do not use this in production. 12 | process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0'; 13 | 14 | // Use verbose logging during development. Set this to false for production. 15 | const verboseLogging = true; 16 | const verboseLog = verboseLogging ? console.log.bind(console) : () => { }; 17 | 18 | // Service state variables 19 | const initialColor = color('#6441A4'); // set initial color; bleedPurple 20 | const bearerPrefix = 'Bearer '; // HTTP authorization headers have this prefix 21 | const colorWheelRotation = 30; 22 | const channelColors = {}; 23 | 24 | const STRINGS = { 25 | secretEnv: usingValue('secret'), 26 | clientIdEnv: usingValue('client-id'), 27 | serverStarted: 'Server running at %s', 28 | secretMissing: missingValue('secret', 'EXT_SECRET'), 29 | clientIdMissing: missingValue('client ID', 'EXT_CLIENT_ID'), 30 | cyclingColor: 'Cycling color for c:%s on behalf of u:%s', 31 | sendColor: 'Sending color %s to c:%s', 32 | invalidAuthHeader: 'Invalid authorization header', 33 | invalidJwt: 'Invalid JWT' 34 | }; 35 | 36 | ext. 37 | version(require('../package.json').version). 38 | option('-s, --secret ', 'Extension secret'). 39 | option('-c, --client-id ', 'Extension client ID'). 40 | parse(process.argv); 41 | 42 | const secret = Buffer.from(getOption('secret', 'ENV_SECRET'), 'base64'); 43 | const clientId = getOption('clientId', 'ENV_CLIENT_ID'); 44 | 45 | const serverOptions = { 46 | host: 'localhost', 47 | port: 8081, 48 | routes: { 49 | cors: { 50 | origin: ['*'] 51 | } 52 | } 53 | }; 54 | const serverPathRoot = path.resolve(__dirname, '..', 'conf', 'server'); 55 | if (fs.existsSync(serverPathRoot + '.crt') && fs.existsSync(serverPathRoot + '.key')) { 56 | serverOptions.tls = { 57 | // If you need a certificate, execute "npm run cert". 58 | cert: fs.readFileSync(serverPathRoot + '.crt'), 59 | key: fs.readFileSync(serverPathRoot + '.key') 60 | }; 61 | } 62 | const server = new Hapi.Server(serverOptions); 63 | 64 | (async () => { 65 | // Handle a viewer request to cycle the color. 66 | server.route({ 67 | method: 'POST', 68 | path: '/color/cycle', 69 | handler: colorCycleHandler 70 | }); 71 | 72 | // Handle a new viewer requesting the color. 73 | server.route({ 74 | method: 'GET', 75 | path: '/color/query', 76 | handler: colorQueryHandler 77 | }); 78 | 79 | // Start the server. 80 | await server.start(); 81 | console.log(STRINGS.serverStarted, server.info.uri); 82 | })(); 83 | 84 | function usingValue (name) { 85 | return `Using environment variable for ${name}`; 86 | } 87 | 88 | function missingValue (name, variable) { 89 | const option = name.charAt(0); 90 | return `Extension ${name} required.\nUse argument "-${option} <${name}>" or environment variable "${variable}".`; 91 | } 92 | 93 | // Get options from the command line or the environment. 94 | function getOption (optionName, environmentName) { 95 | const option = (() => { 96 | if (ext[optionName]) { 97 | return ext[optionName]; 98 | } else if (process.env[environmentName]) { 99 | console.log(STRINGS[optionName + 'Env']); 100 | return process.env[environmentName]; 101 | } 102 | console.log(STRINGS[optionName + 'Missing']); 103 | process.exit(1); 104 | })(); 105 | console.log(`Using "${option}" for ${optionName}`); 106 | return option; 107 | } 108 | 109 | // Verify the header and the enclosed JWT. 110 | function verifyAndDecode (header) { 111 | if (header.startsWith(bearerPrefix)) { 112 | try { 113 | const token = header.substring(bearerPrefix.length); 114 | return jsonwebtoken.verify(token, secret, { algorithms: ['HS256'] }); 115 | } 116 | catch (ex) { 117 | throw Boom.unauthorized(STRINGS.invalidJwt); 118 | } 119 | } 120 | throw Boom.unauthorized(STRINGS.invalidAuthHeader); 121 | } 122 | 123 | function colorCycleHandler (req) { 124 | // Verify all requests. 125 | const payload = verifyAndDecode(req.headers.authorization); 126 | const { channel_id: channelId, opaque_user_id: opaqueUserId } = payload; 127 | 128 | // Store the color for the channel. 129 | let currentColor = channelColors[channelId] || initialColor; 130 | 131 | // Rotate the color as if on a color wheel. 132 | verboseLog(STRINGS.cyclingColor, channelId, opaqueUserId); 133 | currentColor = color(currentColor).rotate(colorWheelRotation).hex(); 134 | 135 | // Save the new color for the channel. 136 | channelColors[channelId] = currentColor; 137 | 138 | return currentColor; 139 | } 140 | 141 | function colorQueryHandler (req) { 142 | // Verify all requests. 143 | const payload = verifyAndDecode(req.headers.authorization); 144 | 145 | // Get the color for the channel from the payload and return it. 146 | const { channel_id: channelId, opaque_user_id: opaqueUserId } = payload; 147 | const currentColor = color(channelColors[channelId] || initialColor).hex(); 148 | verboseLog(STRINGS.sendColor, currentColor, opaqueUserId); 149 | return currentColor; 150 | } 151 | --------------------------------------------------------------------------------