├── .babelrc
├── .gitignore
├── .npmignore
├── README.md
├── docs
    ├── 5adc6a6833404f43b4fc.worker.js
    ├── 5adc6a6833404f43b4fc.worker.js.map
    ├── asset-manifest.json
    ├── build
    │   ├── 5adc6a6833404f43b4fc.worker.js
    │   ├── 5adc6a6833404f43b4fc.worker.js.map
    │   ├── asset-manifest.json
    │   ├── favicon.ico
    │   ├── index.html
    │   ├── logo192.png
    │   ├── logo512.png
    │   ├── manifest.json
    │   ├── precache-manifest.66d346db6de698601a39ed8a709e2767.js
    │   ├── precache-manifest.b2f3c5cb9416dc728ef8643b529823ad.js
    │   ├── robots.txt
    │   ├── service-worker.js
    │   └── static
    │   │   ├── css
    │   │       ├── main.5f361e03.chunk.css
    │   │       └── main.5f361e03.chunk.css.map
    │   │   ├── js
    │   │       ├── 2.81f07a75.chunk.js
    │   │       ├── 2.81f07a75.chunk.js.LICENSE.txt
    │   │       ├── 2.81f07a75.chunk.js.map
    │   │       ├── main.6eb7939b.chunk.js
    │   │       ├── main.6eb7939b.chunk.js.map
    │   │       ├── runtime-main.429db5b2.js
    │   │       └── runtime-main.429db5b2.js.map
    │   │   └── media
    │   │       └── zbar.wasm.b946c8e6.bin
    ├── favicon.ico
    ├── index.html
    ├── logo192.png
    ├── logo512.png
    ├── manifest.json
    ├── precache-manifest.0a252a7546d76ced201dbda56f06b4ef.js
    ├── robots.txt
    ├── service-worker.js
    └── static
    │   ├── css
    │       ├── main.5f361e03.chunk.css
    │       └── main.5f361e03.chunk.css.map
    │   ├── js
    │       ├── 2.81f07a75.chunk.js
    │       ├── 2.81f07a75.chunk.js.LICENSE.txt
    │       ├── 2.81f07a75.chunk.js.map
    │       ├── main.e6fe3195.chunk.js
    │       ├── main.e6fe3195.chunk.js.map
    │       ├── runtime-main.429db5b2.js
    │       └── runtime-main.429db5b2.js.map
    │   └── media
    │       └── zbar.wasm.b946c8e6.bin
├── package-lock.json
├── package.json
├── src
    ├── CodeScanner.jsx
    └── code-scanner.worker.js
└── webpack.config.js


/.babelrc:
--------------------------------------------------------------------------------
1 | {
2 |   "presets": [
3 |       "react",
4 |       "env",
5 |       "stage-0"
6 |   ]
7 | }
8 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | node_modules/
2 | lib/
3 | 


--------------------------------------------------------------------------------
/.npmignore:
--------------------------------------------------------------------------------
1 | src
2 | docs
3 | .babelrc
4 | webpack.config.js
5 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # React Code Scanner
 2 | 
 3 | A react component to scan bar codes and qr codes, it uses the zbar.wasm library in a web worker.
 4 | 
 5 | This uses hooks, so needs React >= 16.8
 6 | 
 7 | ## Install
 8 | 
 9 | `npm i react-code-scanner`
10 | 
11 | ## Usage
12 | 
13 | ```jsx
14 | const [result, setResult] = useState('');
15 | const [facingMode, setFacingMode] = useState('environment');
16 | 
17 | return (
18 |   <div className="App">
19 |     <h1>Code Scanner</h1>
20 |     <div>Result: {result}</div>
21 |     <div>
22 |       <button onClick={() => setResult('')}>reset</button>
23 |     </div>
24 |     <div>
25 |       <button
26 |         onClick={() =>
27 |           setFacingMode(facingMode === 'environment' ? 'user' : 'environment')
28 |         }
29 |       >
30 |         current camera: {facingMode} switch camera
31 |       </button>
32 |     </div>
33 |     <CodeScanner
34 |       onResult={res => setResult(res.map(({ value }) => value).join(', '))}
35 |       onError={setResult}
36 |       facingMode={facingMode}
37 |     />
38 |   </div>
39 | );
40 | ```
41 | 
42 | ## Props
43 | 
44 | | name | default | meaning |
45 | |------|---------|---------|
46 | | width | 400 | the width in px of the camera view |
47 | | height | 300 | the heigth in px of the camera view |
48 | | onResult | console.log | the callback that is invoked when a code is decoded |
49 | | onError | console.error | the callback that is invoked when an error occours |
50 | | maxVideoWidth | 640 | the width in px of the image taken from the camera and passed to the scanner |
51 | | maxVideoHeight | 640 | the width in px of the image taken from the camera and passed to the scanner |
52 | | facingMode | 'environment' | this prop is used by devices with a back and a front camera and takes 2 values: 'environment' to use the back camera and 'user' to use the front camera |
53 | | codeOverlayColor | '#00ff00' | the color of the code overlay that is dispalyed when a code is recognized |
54 | | codeIndexColor | '#ff0000' | the color of the progressivo code id that is dispalyed when a code is recognized |
55 | | mirrorUserImage | true | if true the component will mirror the image when using the front camera |
56 | 


--------------------------------------------------------------------------------
/docs/5adc6a6833404f43b4fc.worker.js:
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29 |   },
30 |   {
31 |     "revision": "b946c8e627a45da7bbf33016aedb1ade",
32 |     "url": "/static/media/zbar.wasm.b946c8e6.bin"
33 |   }
34 | ]);


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1 | # https://www.robotstxt.org/robotstxt.html
2 | User-agent: *
3 | Disallow:
4 | 


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 1 | /**
 2 |  * Welcome to your Workbox-powered service worker!
 3 |  *
 4 |  * You'll need to register this file in your web app and you should
 5 |  * disable HTTP caching for this file too.
 6 |  * See https://goo.gl/nhQhGp
 7 |  *
 8 |  * The rest of the code is auto-generated. Please don't update this file
 9 |  * directly; instead, make changes to your Workbox build configuration
10 |  * and re-run your build process.
11 |  * See https://goo.gl/2aRDsh
12 |  */
13 | 
14 | importScripts("https://storage.googleapis.com/workbox-cdn/releases/4.3.1/workbox-sw.js");
15 | 
16 | importScripts(
17 |   "/precache-manifest.66d346db6de698601a39ed8a709e2767.js"
18 | );
19 | 
20 | self.addEventListener('message', (event) => {
21 |   if (event.data && event.data.type === 'SKIP_WAITING') {
22 |     self.skipWaiting();
23 |   }
24 | });
25 | 
26 | workbox.core.clientsClaim();
27 | 
28 | /**
29 |  * The workboxSW.precacheAndRoute() method efficiently caches and responds to
30 |  * requests for URLs in the manifest.
31 |  * See https://goo.gl/S9QRab
32 |  */
33 | self.__precacheManifest = [].concat(self.__precacheManifest || []);
34 | workbox.precaching.precacheAndRoute(self.__precacheManifest, {});
35 | 
36 | workbox.routing.registerNavigationRoute(workbox.precaching.getCacheKeyForURL("/index.html"), {
37 |   
38 |   blacklist: [/^\/_/,/\/[^\/?]+\.[^\/]+$/],
39 | });
40 | 


--------------------------------------------------------------------------------
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2 | /*# sourceMappingURL=main.5f361e03.chunk.css.map */


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/docs/build/static/js/2.81f07a75.chunk.js.LICENSE.txt:
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 1 | /*
 2 | object-assign
 3 | (c) Sindre Sorhus
 4 | @license MIT
 5 | */
 6 | 
 7 | /** @license React v0.19.1
 8 |  * scheduler.production.min.js
 9 |  *
10 |  * Copyright (c) Facebook, Inc. and its affiliates.
11 |  *
12 |  * This source code is licensed under the MIT license found in the
13 |  * LICENSE file in the root directory of this source tree.
14 |  */
15 | 
16 | /** @license React v16.13.1
17 |  * react-dom.production.min.js
18 |  *
19 |  * Copyright (c) Facebook, Inc. and its affiliates.
20 |  *
21 |  * This source code is licensed under the MIT license found in the
22 |  * LICENSE file in the root directory of this source tree.
23 |  */
24 | 
25 | /** @license React v16.13.1
26 |  * react.production.min.js
27 |  *
28 |  * Copyright (c) Facebook, Inc. and its affiliates.
29 |  *
30 |  * This source code is licensed under the MIT license found in the
31 |  * LICENSE file in the root directory of this source tree.
32 |  */
33 | 


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facingMode), 1);\n    ctx.fillText('#' + i, points[0].x, points[0].y - 10);\n    ctx.scale(1, 1);\n  });\n};\n\nconst processImage = async ({\n  video,\n  canvas,\n  onResult,\n  facingMode,\n  codeOverlayColor,\n  codeIndexColor,\n  mirrorUserImage,\n}) => {\n  const width = video.videoWidth;\n  const height = video.videoHeight;\n  canvas.width = width;\n  canvas.height = height;\n  if (!width || !height) {\n    return;\n  }\n\n  const ctx = canvas.getContext('2d');\n  ctx.drawImage(video, 0, 0, width, height);\n  const imgData = ctx.getImageData(0, 0, width, height);\n  const codes = await scannerWorker.scanImageData(imgData);\n  renderOverlay({\n    canvas,\n    codes,\n    facingMode,\n    codeOverlayColor,\n    codeIndexColor,\n    mirrorUserImage,\n  });\n  if (codes.length) {\n    onResult(codes);\n  }\n};\n\nconst sleep = ms =>\n  new Promise(r => {\n    setTimeout(r, ms);\n  });\n\nconst main = async ({\n  video,\n  canvas,\n  onResult,\n  onError,\n  maxVideoWidth,\n  maxVideoHeight,\n  facingMode,\n  codeOverlayColor,\n  codeIndexColor,\n  mirrorUserImage,\n}) => {\n  try {\n    await init({ video, maxVideoWidth, maxVideoHeight, facingMode });\n\n    while (true) {\n      await processImage({\n        video,\n        canvas,\n        onResult,\n        facingMode,\n        codeOverlayColor,\n        codeIndexColor,\n        mirrorUserImage,\n      });\n      await sleep(SCAN_PROID_MS);\n    }\n  } catch (err) {\n    onError(err.message);\n  }\n};\n\nconst getScaleX = (mirrorUserImage, facingMode) =>\n  mirrorUserImage && facingMode === 'user' ? -1 : 1;\n\nconst CodeScanner = parentProps => {\n  const defaultOptions = {\n    width: 400,\n    height: 300,\n    onResult: console.log,\n    onError: console.error,\n    maxVideoWidth: 640,\n    maxVideoHeight: 640,\n    facingMode: 'environment',\n    codeOverlayColor: '#00ff00',\n    codeIndexColor: '#ff0000',\n    mirrorUserImage: true,\n  };\n  const options = {\n    ...defaultOptions,\n    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However, it also means that developers (and users)\n// will only see deployed updates on subsequent visits to a page, after all the\n// existing tabs open on the page have been closed, since previously cached\n// resources are updated in the background.\n\n// To learn more about the benefits of this model and instructions on how to\n// opt-in, read https://bit.ly/CRA-PWA\n\nconst isLocalhost = Boolean(\n  window.location.hostname === 'localhost' ||\n    // [::1] is the IPv6 localhost address.\n    window.location.hostname === '[::1]' ||\n    // 127.0.0.0/8 are considered localhost for IPv4.\n    window.location.hostname.match(\n      /^127(?:\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/\n    )\n);\n\nexport function register(config) {\n  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {\n    // The URL constructor is available in all browsers that support SW.\n    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);\n    if (publicUrl.origin !== window.location.origin) {\n      // Our service worker won't work if PUBLIC_URL is on a different origin\n      // from what our page is served on. This might happen if a CDN is used to\n      // serve assets; see https://github.com/facebook/create-react-app/issues/2374\n      return;\n    }\n\n    window.addEventListener('load', () => {\n      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;\n\n      if (isLocalhost) {\n        // This is running on localhost. Let's check if a service worker still exists or not.\n        checkValidServiceWorker(swUrl, config);\n\n        // Add some additional logging to localhost, pointing developers to the\n        // service worker/PWA documentation.\n        navigator.serviceWorker.ready.then(() => {\n          console.log(\n            'This web app is being served cache-first by a service ' +\n              'worker. To learn more, visit https://bit.ly/CRA-PWA'\n          );\n        });\n      } else {\n        // Is not localhost. Just register service worker\n        registerValidSW(swUrl, config);\n      }\n    });\n  }\n}\n\nfunction registerValidSW(swUrl, config) {\n  navigator.serviceWorker\n    .register(swUrl)\n    .then(registration => {\n      registration.onupdatefound = () => {\n        const installingWorker = registration.installing;\n        if (installingWorker == null) {\n          return;\n        }\n        installingWorker.onstatechange = () => {\n          if (installingWorker.state === 'installed') {\n            if (navigator.serviceWorker.controller) {\n              // At this point, the updated precached content has been fetched,\n              // but the previous service worker will still serve the older\n              // content until all client tabs are closed.\n              console.log(\n                'New content is available and will be used when all ' +\n                  'tabs for this page are closed. See https://bit.ly/CRA-PWA.'\n              );\n\n              // Execute callback\n              if (config && config.onUpdate) {\n                config.onUpdate(registration);\n              }\n            } else {\n              // At this point, everything has been precached.\n              // It's the perfect time to display a\n              // \"Content is cached for offline use.\" message.\n              console.log('Content is cached for offline use.');\n\n              // Execute callback\n              if (config && config.onSuccess) {\n                config.onSuccess(registration);\n              }\n            }\n          }\n        };\n      };\n    })\n    .catch(error => {\n      console.error('Error during service worker registration:', error);\n    });\n}\n\nfunction checkValidServiceWorker(swUrl, config) {\n  // Check if the service worker can be found. 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App is running in offline mode.'\n      );\n    });\n}\n\nexport function unregister() {\n  if ('serviceWorker' in navigator) {\n    navigator.serviceWorker.ready\n      .then(registration => {\n        registration.unregister();\n      })\n      .catch(error => {\n        console.error(error.message);\n      });\n  }\n}\n","import React from 'react';\nimport ReactDOM from 'react-dom';\nimport './index.css';\nimport App from './App';\nimport * as serviceWorker from './serviceWorker';\n\nReactDOM.render(\n  <React.StrictMode>\n    <App />\n  </React.StrictMode>,\n  document.getElementById('root')\n);\n\n// If you want your app to work offline and load faster, you can change\n// unregister() to register() below. Note this comes with some pitfalls.\n// Learn more about service workers: https://bit.ly/CRA-PWA\nserviceWorker.unregister();\n"],"sourceRoot":""}


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 1 | {
 2 |   "short_name": "React App",
 3 |   "name": "Create React App Sample",
 4 |   "icons": [
 5 |     {
 6 |       "src": "favicon.ico",
 7 |       "sizes": "64x64 32x32 24x24 16x16",
 8 |       "type": "image/x-icon"
 9 |     },
10 |     {
11 |       "src": "logo192.png",
12 |       "type": "image/png",
13 |       "sizes": "192x192"
14 |     },
15 |     {
16 |       "src": "logo512.png",
17 |       "type": "image/png",
18 |       "sizes": "512x512"
19 |     }
20 |   ],
21 |   "start_url": ".",
22 |   "display": "standalone",
23 |   "theme_color": "#000000",
24 |   "background_color": "#ffffff"
25 | }
26 | 


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 1 | self.__precacheManifest = (self.__precacheManifest || []).concat([
 2 |   {
 3 |     "revision": "4d558512867c1e5f376518f489970284",
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 8 |     "url": "/index.html"
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10 |   {
11 |     "revision": "823fbed51b1d89ede98b",
12 |     "url": "/static/css/main.5f361e03.chunk.css"
13 |   },
14 |   {
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16 |     "url": "/static/js/2.81f07a75.chunk.js"
17 |   },
18 |   {
19 |     "revision": "e88a3e95b5364d46e95b35ae8c0dc27d",
20 |     "url": "/static/js/2.81f07a75.chunk.js.LICENSE.txt"
21 |   },
22 |   {
23 |     "revision": "823fbed51b1d89ede98b",
24 |     "url": "/static/js/main.e6fe3195.chunk.js"
25 |   },
26 |   {
27 |     "revision": "de5510aa175980a3d98e",
28 |     "url": "/static/js/runtime-main.429db5b2.js"
29 |   },
30 |   {
31 |     "revision": "b946c8e627a45da7bbf33016aedb1ade",
32 |     "url": "/static/media/zbar.wasm.b946c8e6.bin"
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2 | User-agent: *
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 1 | /**
 2 |  * Welcome to your Workbox-powered service worker!
 3 |  *
 4 |  * You'll need to register this file in your web app and you should
 5 |  * disable HTTP caching for this file too.
 6 |  * See https://goo.gl/nhQhGp
 7 |  *
 8 |  * The rest of the code is auto-generated. Please don't update this file
 9 |  * directly; instead, make changes to your Workbox build configuration
10 |  * and re-run your build process.
11 |  * See https://goo.gl/2aRDsh
12 |  */
13 | 
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15 | 
16 | importScripts(
17 |   "/precache-manifest.0a252a7546d76ced201dbda56f06b4ef.js"
18 | );
19 | 
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21 |   if (event.data && event.data.type === 'SKIP_WAITING') {
22 |     self.skipWaiting();
23 |   }
24 | });
25 | 
26 | workbox.core.clientsClaim();
27 | 
28 | /**
29 |  * The workboxSW.precacheAndRoute() method efficiently caches and responds to
30 |  * requests for URLs in the manifest.
31 |  * See https://goo.gl/S9QRab
32 |  */
33 | self.__precacheManifest = [].concat(self.__precacheManifest || []);
34 | workbox.precaching.precacheAndRoute(self.__precacheManifest, {});
35 | 
36 | workbox.routing.registerNavigationRoute(workbox.precaching.getCacheKeyForURL("/index.html"), {
37 |   
38 |   blacklist: [/^\/_/,/\/[^\/?]+\.[^\/]+$/],
39 | });
40 | 


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 1 | /*
 2 | object-assign
 3 | (c) Sindre Sorhus
 4 | @license MIT
 5 | */
 6 | 
 7 | /** @license React v0.19.1
 8 |  * scheduler.production.min.js
 9 |  *
10 |  * Copyright (c) Facebook, Inc. and its affiliates.
11 |  *
12 |  * This source code is licensed under the MIT license found in the
13 |  * LICENSE file in the root directory of this source tree.
14 |  */
15 | 
16 | /** @license React v16.13.1
17 |  * react-dom.production.min.js
18 |  *
19 |  * Copyright (c) Facebook, Inc. and its affiliates.
20 |  *
21 |  * This source code is licensed under the MIT license found in the
22 |  * LICENSE file in the root directory of this source tree.
23 |  */
24 | 
25 | /** @license React v16.13.1
26 |  * react.production.min.js
27 |  *
28 |  * Copyright (c) Facebook, Inc. and its affiliates.
29 |  *
30 |  * This source code is licensed under the MIT license found in the
31 |  * LICENSE file in the root directory of this source tree.
32 |  */
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wrap = require('comlink').wrap,Worker = require(\"!worker-loader?{}!/Users/fbedussi/repo/code-scanner-app/node_modules/comlink-loader/dist/comlink-worker-loader.js!/Users/fbedussi/repo/code-scanner-app/node_modules/babel-loader/lib/index.js??ref--6-oneOf-1!/Users/fbedussi/repo/code-scanner-app/node_modules/eslint-loader/dist/cjs.js??ref--5-0!/Users/fbedussi/repo/code-scanner-app/src/worker/worker.js\"),inst;module.exports = function f() {if (this instanceof f) return wrap(Worker());return inst || (inst = wrap(Worker()));};","module.exports = function() {\n  return new Worker(__webpack_public_path__ + \"5adc6a6833404f43b4fc.worker.js\");\n};","import React, { useEffect, useRef } from 'react';\nimport ScannerWorker from './worker';\n\nconst scannerWorker = new ScannerWorker();\n\nconst SCAN_PROID_MS = 800;\n\nconst init = async ({ video, maxVideoWidth, maxVideoHeight, facingMode }) => {\n  const mediaStream = await navigator.mediaDevices.getUserMedia({\n    audio: false,\n    video: {\n      facingMode,\n      width: { max: maxVideoWidth },\n      height: { max: maxVideoHeight },\n    },\n  });\n  video.srcObject = mediaStream;\n  video.play();\n  await new Promise(r => {\n    video.onloadedmetadata = r;\n  });\n};\n\nconst renderOverlay = ({\n  canvas,\n  codes,\n  facingMode,\n  codeOverlayColor,\n  codeIndexColor,\n  mirrorUserImage,\n}) => {\n  const ctx = canvas.getContext('2d');\n  const width = canvas.width;\n  const height = canvas.height;\n  ctx.clearRect(0, 0, width, height);\n  ctx.font = '20px serif';\n  ctx.strokeStyle = codeOverlayColor;\n  ctx.fillStyle = codeIndexColor;\n  ctx.lineWidth = 6;\n  codes.forEach((sym, i) => {\n    const points = sym.points;\n    ctx.beginPath();\n    for (let j = 0; j < points.length; ++j) {\n      const { x, y } = points[j];\n      if (j === 0) {\n        ctx.moveTo(x, y);\n      } else {\n        ctx.lineTo(x, y);\n      }\n    }\n    ctx.closePath();\n\n    ctx.stroke();\n    ctx.scale(getScaleX(mirrorUserImage, facingMode), 1);\n    ctx.fillText('#' + i, points[0].x, points[0].y - 10);\n    ctx.scale(1, 1);\n  });\n};\n\nconst processImage = async ({\n  video,\n  canvas,\n  onResult,\n  facingMode,\n  codeOverlayColor,\n  codeIndexColor,\n  mirrorUserImage,\n}) => {\n  const width = video.videoWidth;\n  const height = video.videoHeight;\n  canvas.width = width;\n  canvas.height = height;\n  if (!width || !height) {\n    return;\n  }\n\n  const ctx = canvas.getContext('2d');\n  ctx.drawImage(video, 0, 0, width, height);\n  const imgData = ctx.getImageData(0, 0, width, height);\n  const codes = await scannerWorker.scanImageData(imgData);\n  renderOverlay({\n    canvas,\n    codes,\n    facingMode,\n    codeOverlayColor,\n    codeIndexColor,\n    mirrorUserImage,\n  });\n  if (codes.length) {\n    onResult(codes);\n  }\n};\n\nconst sleep = ms =>\n  new Promise(r => {\n    setTimeout(r, ms);\n  });\n\nconst main = async ({\n  video,\n  canvas,\n  onResult,\n  onError,\n  maxVideoWidth,\n  maxVideoHeight,\n  facingMode,\n  codeOverlayColor,\n  codeIndexColor,\n  mirrorUserImage,\n}) => {\n  try {\n    await init({ video, maxVideoWidth, maxVideoHeight, facingMode });\n\n    while (true) {\n      await processImage({\n        video,\n        canvas,\n        onResult,\n        facingMode,\n        codeOverlayColor,\n        codeIndexColor,\n        mirrorUserImage,\n      });\n      await sleep(SCAN_PROID_MS);\n    }\n  } catch (err) {\n    onError(err.message);\n  }\n};\n\nconst getScaleX = (mirrorUserImage, facingMode) =>\n  mirrorUserImage && facingMode === 'user' ? -1 : 1;\n\nconst CodeScanner = parentProps => {\n  const defaultOptions = {\n    width: 400,\n    height: 300,\n    onResult: console.log,\n    onError: console.error,\n    maxVideoWidth: 640,\n    maxVideoHeight: 640,\n    facingMode: 'environment',\n    codeOverlayColor: '#00ff00',\n    codeIndexColor: '#ff0000',\n    mirrorUserImage: true,\n  };\n  const options = {\n    ...defaultOptions,\n    ...parentProps,\n  };\n  const {\n    width,\n    height,\n    onResult,\n    onError,\n    maxVideoWidth,\n    maxVideoHeight,\n    facingMode,\n    codeOverlayColor,\n    codeIndexColor,\n    mirrorUserImage,\n  } = options;\n\n  const videoRef = useRef(null);\n  const canvasRef = useRef(null);\n\n  useEffect(() => {\n    if (videoRef.current && canvasRef.current) {\n      main({\n        video: videoRef.current,\n        canvas: canvasRef.current,\n        onResult,\n        onError,\n        maxVideoWidth,\n        maxVideoHeight,\n        facingMode,\n        codeOverlayColor,\n        codeIndexColor,\n        mirrorUserImage,\n      });\n    }\n  }, [\n    videoRef,\n    canvasRef,\n    onResult,\n    onError,\n    maxVideoWidth,\n    maxVideoHeight,\n    facingMode,\n    codeOverlayColor,\n    codeIndexColor,\n    mirrorUserImage,\n  ]);\n\n  const style = {\n    position: 'absolute',\n    top: 0,\n    left: 0,\n    width: `${width}px`,\n    height: `${height}px`,\n  };\n  return (\n    <div\n      style={{\n        ...style,\n        position: 'relative',\n        transform: `scaleX(${getScaleX(mirrorUserImage, facingMode)})`,\n      }}\n    >\n      <video ref={videoRef} width={width} height={height} style={style} />\n      <canvas ref={canvasRef} width={width} height={height} style={style} />\n    </div>\n  );\n};\n\nexport default CodeScanner;\n","// eslint-disable-next-line\nimport Worker from 'comlink-loader!./worker'; // inline loader\n\nexport default Worker;\n","import React, { useState } from 'react';\nimport './App.css';\nimport CodeScanner from './CodeScanner';\n\nfunction App() {\n  const [result, setResult] = useState('');\n  const [facingMode, setFacingMode] = useState('environment');\n\n  return (\n    <div className=\"App\">\n      <h1>Code Scanner</h1>\n      <div>Result: {result}</div>\n      <div>\n        <button onClick={() => setResult('')}>reset</button>\n      </div>\n      <div>\n        <button\n          onClick={() =>\n            setFacingMode(facingMode === 'environment' ? 'user' : 'environment')\n          }\n        >\n          current camera: {facingMode} switch camera\n        </button>\n      </div>\n      <CodeScanner\n        onResult={res => setResult(res.map(({ value }) => value).join(', '))}\n        onError={setResult}\n        facingMode={facingMode}\n      />\n    </div>\n  );\n}\n\nexport default App;\n","// This optional code is used to register a service worker.\n// register() is not called by default.\n\n// This lets the app load faster on subsequent visits in production, and gives\n// it offline capabilities. However, it also means that developers (and users)\n// will only see deployed updates on subsequent visits to a page, after all the\n// existing tabs open on the page have been closed, since previously cached\n// resources are updated in the background.\n\n// To learn more about the benefits of this model and instructions on how to\n// opt-in, read https://bit.ly/CRA-PWA\n\nconst isLocalhost = Boolean(\n  window.location.hostname === 'localhost' ||\n    // [::1] is the IPv6 localhost address.\n    window.location.hostname === '[::1]' ||\n    // 127.0.0.0/8 are considered localhost for IPv4.\n    window.location.hostname.match(\n      /^127(?:\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/\n    )\n);\n\nexport function register(config) {\n  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {\n    // The URL constructor is available in all browsers that support SW.\n    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);\n    if (publicUrl.origin !== window.location.origin) {\n      // Our service worker won't work if PUBLIC_URL is on a different origin\n      // from what our page is served on. This might happen if a CDN is used to\n      // serve assets; see https://github.com/facebook/create-react-app/issues/2374\n      return;\n    }\n\n    window.addEventListener('load', () => {\n      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;\n\n      if (isLocalhost) {\n        // This is running on localhost. Let's check if a service worker still exists or not.\n        checkValidServiceWorker(swUrl, config);\n\n        // Add some additional logging to localhost, pointing developers to the\n        // service worker/PWA documentation.\n        navigator.serviceWorker.ready.then(() => {\n          console.log(\n            'This web app is being served cache-first by a service ' +\n              'worker. To learn more, visit https://bit.ly/CRA-PWA'\n          );\n        });\n      } else {\n        // Is not localhost. Just register service worker\n        registerValidSW(swUrl, config);\n      }\n    });\n  }\n}\n\nfunction registerValidSW(swUrl, config) {\n  navigator.serviceWorker\n    .register(swUrl)\n    .then(registration => {\n      registration.onupdatefound = () => {\n        const installingWorker = registration.installing;\n        if (installingWorker == null) {\n          return;\n        }\n        installingWorker.onstatechange = () => {\n          if (installingWorker.state === 'installed') {\n            if (navigator.serviceWorker.controller) {\n              // At this point, the updated precached content has been fetched,\n              // but the previous service worker will still serve the older\n              // content until all client tabs are closed.\n              console.log(\n                'New content is available and will be used when all ' +\n                  'tabs for this page are closed. See https://bit.ly/CRA-PWA.'\n              );\n\n              // Execute callback\n              if (config && config.onUpdate) {\n                config.onUpdate(registration);\n              }\n            } else {\n              // At this point, everything has been precached.\n              // It's the perfect time to display a\n              // \"Content is cached for offline use.\" message.\n              console.log('Content is cached for offline use.');\n\n              // Execute callback\n              if (config && config.onSuccess) {\n                config.onSuccess(registration);\n              }\n            }\n          }\n        };\n      };\n    })\n    .catch(error => {\n      console.error('Error during service worker registration:', error);\n    });\n}\n\nfunction checkValidServiceWorker(swUrl, config) {\n  // Check if the service worker can be found. If it can't reload the page.\n  fetch(swUrl, {\n    headers: { 'Service-Worker': 'script' },\n  })\n    .then(response => {\n      // Ensure service worker exists, and that we really are getting a JS file.\n      const contentType = response.headers.get('content-type');\n      if (\n        response.status === 404 ||\n        (contentType != null && contentType.indexOf('javascript') === -1)\n      ) {\n        // No service worker found. Probably a different app. Reload the page.\n        navigator.serviceWorker.ready.then(registration => {\n          registration.unregister().then(() => {\n            window.location.reload();\n          });\n        });\n      } else {\n        // Service worker found. Proceed as normal.\n        registerValidSW(swUrl, config);\n      }\n    })\n    .catch(() => {\n      console.log(\n        'No internet connection found. App is running in offline mode.'\n      );\n    });\n}\n\nexport function unregister() {\n  if ('serviceWorker' in navigator) {\n    navigator.serviceWorker.ready\n      .then(registration => {\n        registration.unregister();\n      })\n      .catch(error => {\n        console.error(error.message);\n      });\n  }\n}\n","import React from 'react';\nimport ReactDOM from 'react-dom';\nimport './index.css';\nimport App from './App';\nimport * as serviceWorker from './serviceWorker';\n\nReactDOM.render(\n  <React.StrictMode>\n    <App />\n  </React.StrictMode>,\n  document.getElementById('root')\n);\n\n// If you want your app to work offline and load faster, you can change\n// unregister() to register() below. Note this comes with some pitfalls.\n// Learn more about service workers: https://bit.ly/CRA-PWA\nserviceWorker.unregister();\n"],"sourceRoot":""}


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/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "react-code-scanner",
 3 |   "version": "1.0.1",
 4 |   "description": "A react component to scan bar codes and qr codes, it uses the zbar.wasm library in a web worker",
 5 |   "main": "./lib/CodeScanner.js",
 6 |   "repository": {
 7 |     "type": "git",
 8 |     "url": "https://github.com/fbedussi/react-code-scanner"
 9 |   },
10 |   "license": "MIT",
11 |   "scripts": {
12 |     "build": "webpack"
13 |   },
14 |   "peerDependencies": {
15 |     "react": "^16.8.0",
16 |     "react-dom": "^16.8.0"
17 |   },
18 |   "devDependencies": {
19 |     "babel-core": "^6.21.0",
20 |     "babel-loader": "^7.1.4",
21 |     "babel-preset-env": "^1.6.1",
22 |     "babel-preset-react": "^6.16.0",
23 |     "babel-preset-stage-0": "^6.24.1",
24 |     "path": "^0.12.7",
25 |     "prop-types": "^15.6.0",
26 |     "react": "^16.0.0",
27 |     "react-dom": "^16.0.0",
28 |     "wasm-loader": "^1.3.0",
29 |     "webpack": "^4.5.0",
30 |     "webpack-cli": "^3.2.1",
31 |     "worker-loader": "^3.0.2"
32 |   },
33 |   "dependencies": {
34 |     "zbar.wasm": "^2.0.3"
35 |   }
36 | }
37 | 


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/src/CodeScanner.jsx:
--------------------------------------------------------------------------------
  1 | import React, { useEffect, useRef } from 'react';
  2 | import ScannerWorker from './code-scanner.worker';
  3 | 
  4 | const scannerWorker = new ScannerWorker();
  5 | 
  6 | const SCAN_PROID_MS = 800;
  7 | 
  8 | export const scanImageData = imageData => {
  9 |   return new Promise(res => {
 10 |     const cb = e => {
 11 |       res(e.data.response);
 12 |     };
 13 |     scannerWorker.addEventListener('message', cb);
 14 |     scannerWorker.postMessage({
 15 |       imageData,
 16 |     });
 17 |   });
 18 | };
 19 | 
 20 | const init = async ({ video, maxVideoWidth, maxVideoHeight, facingMode }) => {
 21 |   const mediaStream = await navigator.mediaDevices.getUserMedia({
 22 |     audio: false,
 23 |     video: {
 24 |       facingMode,
 25 |       width: { max: maxVideoWidth },
 26 |       height: { max: maxVideoHeight },
 27 |     },
 28 |   });
 29 |   video.srcObject = mediaStream;
 30 |   video.play();
 31 |   await new Promise(r => {
 32 |     video.onloadedmetadata = r;
 33 |   });
 34 | };
 35 | 
 36 | const renderOverlay = ({
 37 |   canvas,
 38 |   codes,
 39 |   facingMode,
 40 |   codeOverlayColor,
 41 |   codeIndexColor,
 42 |   mirrorUserImage,
 43 | }) => {
 44 |   const ctx = canvas.getContext('2d');
 45 |   const width = canvas.width;
 46 |   const height = canvas.height;
 47 |   ctx.clearRect(0, 0, width, height);
 48 |   ctx.font = '20px serif';
 49 |   ctx.strokeStyle = codeOverlayColor;
 50 |   ctx.fillStyle = codeIndexColor;
 51 |   ctx.lineWidth = 6;
 52 |   codes.forEach((sym, i) => {
 53 |     const points = sym.points;
 54 |     ctx.beginPath();
 55 |     for (let j = 0; j < points.length; ++j) {
 56 |       const { x, y } = points[j];
 57 |       if (j === 0) {
 58 |         ctx.moveTo(x, y);
 59 |       } else {
 60 |         ctx.lineTo(x, y);
 61 |       }
 62 |     }
 63 |     ctx.closePath();
 64 | 
 65 |     ctx.stroke();
 66 |     ctx.scale(getScaleX(mirrorUserImage, facingMode), 1);
 67 |     ctx.fillText('#' + i, points[0].x, points[0].y - 10);
 68 |     ctx.scale(1, 1);
 69 |   });
 70 | };
 71 | 
 72 | const processImage = async ({
 73 |   video,
 74 |   canvas,
 75 |   onResult,
 76 |   facingMode,
 77 |   codeOverlayColor,
 78 |   codeIndexColor,
 79 |   mirrorUserImage,
 80 | }) => {
 81 |   const width = video.videoWidth;
 82 |   const height = video.videoHeight;
 83 |   canvas.width = width;
 84 |   canvas.height = height;
 85 |   if (!width || !height) {
 86 |     return;
 87 |   }
 88 | 
 89 |   const ctx = canvas.getContext('2d');
 90 |   ctx.drawImage(video, 0, 0, width, height);
 91 |   const imgData = ctx.getImageData(0, 0, width, height);
 92 |   const codes = await scanImageData(imgData);
 93 |   renderOverlay({
 94 |     canvas,
 95 |     codes,
 96 |     facingMode,
 97 |     codeOverlayColor,
 98 |     codeIndexColor,
 99 |     mirrorUserImage,
100 |   });
101 |   if (codes.length) {
102 |     onResult(codes);
103 |   }
104 | };
105 | 
106 | const sleep = ms =>
107 |   new Promise(r => {
108 |     setTimeout(r, ms);
109 |   });
110 | 
111 | const main = async ({
112 |   video,
113 |   canvas,
114 |   onResult,
115 |   onError,
116 |   maxVideoWidth,
117 |   maxVideoHeight,
118 |   facingMode,
119 |   codeOverlayColor,
120 |   codeIndexColor,
121 |   mirrorUserImage,
122 | }) => {
123 |   try {
124 |     await init({ video, maxVideoWidth, maxVideoHeight, facingMode });
125 | 
126 |     while (true) {
127 |       await processImage({
128 |         video,
129 |         canvas,
130 |         onResult,
131 |         facingMode,
132 |         codeOverlayColor,
133 |         codeIndexColor,
134 |         mirrorUserImage,
135 |       });
136 |       await sleep(SCAN_PROID_MS);
137 |     }
138 |   } catch (err) {
139 |     onError(err.message);
140 |   }
141 | };
142 | 
143 | const getScaleX = (mirrorUserImage, facingMode) =>
144 |   mirrorUserImage && facingMode === 'user' ? -1 : 1;
145 | 
146 | const CodeScanner = parentProps => {
147 |   const defaultOptions = {
148 |     width: 400,
149 |     height: 300,
150 |     onResult: console.log,
151 |     onError: console.error,
152 |     maxVideoWidth: 640,
153 |     maxVideoHeight: 640,
154 |     facingMode: 'environment',
155 |     codeOverlayColor: '#00ff00',
156 |     codeIndexColor: '#ff0000',
157 |     mirrorUserImage: true,
158 |   };
159 |   const options = {
160 |     ...defaultOptions,
161 |     ...parentProps,
162 |   };
163 |   const {
164 |     width,
165 |     height,
166 |     onResult,
167 |     onError,
168 |     maxVideoWidth,
169 |     maxVideoHeight,
170 |     facingMode,
171 |     codeOverlayColor,
172 |     codeIndexColor,
173 |     mirrorUserImage,
174 |   } = options;
175 | 
176 |   const videoRef = useRef(null);
177 |   const canvasRef = useRef(null);
178 | 
179 |   useEffect(() => {
180 |     if (videoRef.current && canvasRef.current) {
181 |       main({
182 |         video: videoRef.current,
183 |         canvas: canvasRef.current,
184 |         onResult,
185 |         onError,
186 |         maxVideoWidth,
187 |         maxVideoHeight,
188 |         facingMode,
189 |         codeOverlayColor,
190 |         codeIndexColor,
191 |         mirrorUserImage,
192 |       });
193 |     }
194 |   }, [
195 |     videoRef,
196 |     canvasRef,
197 |     onResult,
198 |     onError,
199 |     maxVideoWidth,
200 |     maxVideoHeight,
201 |     facingMode,
202 |     codeOverlayColor,
203 |     codeIndexColor,
204 |     mirrorUserImage,
205 |   ]);
206 | 
207 |   const style = {
208 |     position: 'absolute',
209 |     top: 0,
210 |     left: 0,
211 |     width: `${width}px`,
212 |     height: `${height}px`,
213 |   };
214 |   return (
215 |     <div
216 |       style={{
217 |         ...style,
218 |         position: 'relative',
219 |         transform: `scaleX(${getScaleX(mirrorUserImage, facingMode)})`,
220 |       }}
221 |     >
222 |       <video ref={videoRef} width={width} height={height} style={style} />
223 |       <canvas ref={canvasRef} width={width} height={height} style={style} />
224 |     </div>
225 |   );
226 | };
227 | 
228 | export default CodeScanner;
229 | 


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/src/code-scanner.worker.js:
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 1 | /* eslint-disable no-restricted-globals */
 2 | import { scanImageData } from 'zbar.wasm';
 3 | 
 4 | self.addEventListener('message', async e => {
 5 |   const symbols = await scanImageData(e.data.imageData);
 6 |   const response = symbols.map((sym, i) => ({
 7 |     index: i,
 8 |     type: sym.typeName,
 9 |     value: sym.decode(),
10 |     points: sym.points,
11 |   }));
12 |   self.postMessage({ response });
13 | });
14 | 


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/webpack.config.js:
--------------------------------------------------------------------------------
 1 | var path = require('path');
 2 | 
 3 | module.exports = {
 4 |     mode: 'production',
 5 |     entry: './src/CodeScanner.jsx',
 6 |     output: {
 7 |         path: path.resolve('lib'),
 8 |         filename: 'CodeScanner.js',
 9 |         libraryTarget: 'commonjs2'
10 |     },
11 |    module: {
12 |         rules: [
13 |           {
14 |             test: /\.wasm(.bin)?$/,
15 |             use: ['wasm-loader']
16 |           },
17 |           {
18 |             test: /\.worker\.js$/,
19 |             use: {
20 |               loader: 'worker-loader',
21 |             },
22 |           },
23 |           {
24 |               test: /\.jsx?$/,
25 |               exclude: /(node_modules)/,
26 |               use: 'babel-loader'
27 |           }
28 |         ]
29 |     }
30 | }
31 | 


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