├── .gitignore ├── CODE_OF_CONDUCT.md ├── LICENSE_APACHE ├── LICENSE_MIT ├── README.md ├── index.js ├── package.json └── wrangler.toml /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | worker 3 | dist 4 | -------------------------------------------------------------------------------- /CODE_OF_CONDUCT.md: -------------------------------------------------------------------------------- 1 | # Contributor Covenant Code of Conduct 2 | 3 | ## Our Pledge 4 | 5 | In the interest of fostering an open and welcoming environment, we as 6 | contributors and maintainers pledge to making participation in our project and 7 | our community a harassment-free experience for everyone, regardless of age, body 8 | size, disability, ethnicity, sex characteristics, gender identity and expression, 9 | level of experience, education, socio-economic status, nationality, personal 10 | appearance, race, religion, or sexual identity and orientation. 11 | 12 | ## Our Standards 13 | 14 | Examples of behavior that contributes to creating a positive environment 15 | include: 16 | 17 | * Using welcoming and inclusive language 18 | * Being respectful of differing viewpoints and experiences 19 | * Gracefully accepting constructive criticism 20 | * Focusing on what is best for the community 21 | * Showing empathy towards other community members 22 | 23 | Examples of unacceptable behavior by participants include: 24 | 25 | * The use of sexualized language or imagery and unwelcome sexual attention or 26 | advances 27 | * Trolling, insulting/derogatory comments, and personal or political attacks 28 | * Public or private harassment 29 | * Publishing others' private information, such as a physical or electronic 30 | address, without explicit permission 31 | * Other conduct which could reasonably be considered inappropriate in a 32 | professional setting 33 | 34 | ## Our Responsibilities 35 | 36 | Project maintainers are responsible for clarifying the standards of acceptable 37 | behavior and are expected to take appropriate and fair corrective action in 38 | response to any instances of unacceptable behavior. 39 | 40 | Project maintainers have the right and responsibility to remove, edit, or 41 | reject comments, commits, code, wiki edits, issues, and other contributions 42 | that are not aligned to this Code of Conduct, or to ban temporarily or 43 | permanently any contributor for other behaviors that they deem inappropriate, 44 | threatening, offensive, or harmful. 45 | 46 | ## Scope 47 | 48 | This Code of Conduct applies both within project spaces and in public spaces 49 | when an individual is representing the project or its community. Examples of 50 | representing a project or community include using an official project e-mail 51 | address, posting via an official social media account, or acting as an appointed 52 | representative at an online or offline event. Representation of a project may be 53 | further defined and clarified by project maintainers. 54 | 55 | ## Enforcement 56 | 57 | Instances of abusive, harassing, or otherwise unacceptable behavior may be 58 | reported by contacting the project team at ag_dubs@cloudflare.com. All 59 | complaints will be reviewed and investigated and will result in a response that 60 | is deemed necessary and appropriate to the circumstances. The project team is 61 | obligated to maintain confidentiality with regard to the reporter of an incident. 62 | Further details of specific enforcement policies may be posted separately. 63 | 64 | Project maintainers who do not follow or enforce the Code of Conduct in good 65 | faith may face temporary or permanent repercussions as determined by other 66 | members of the project's leadership. 67 | 68 | ## Attribution 69 | 70 | This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, 71 | available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html 72 | 73 | [homepage]: https://www.contributor-covenant.org 74 | 75 | For answers to common questions about this code of conduct, see 76 | https://www.contributor-covenant.org/faq 77 | -------------------------------------------------------------------------------- /LICENSE_APACHE: -------------------------------------------------------------------------------- 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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IN NO EVENT 21 | SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 22 | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR 24 | IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 25 | DEALINGS IN THE SOFTWARE. 26 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # 👷 `img-color-worker` 2 | 3 | Retrieve the dominant color of a PNG or JPEG image. 4 | 5 | `index.js` is the content of the Workers script. 6 | 7 | #### Wrangler 8 | 9 | To generate using [wrangler](https://github.com/cloudflare/wrangler) 10 | 11 | ``` 12 | wrangler generate myapp https://github.com/xtuc/img-color-worker 13 | ``` 14 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | import { PNG } from 'pngjs/browser' 2 | import str from 'string-to-stream' 3 | var jpeg = require('jpeg-js') 4 | 5 | function base64ToArrayBuffer(base64) { 6 | var binary_string = atob(base64) 7 | var len = binary_string.length 8 | var bytes = new Uint8Array(len) 9 | for (var i = 0; i < len; i++) { 10 | bytes[i] = binary_string.charCodeAt(i) 11 | } 12 | return bytes.buffer 13 | } 14 | 15 | addEventListener('fetch', event => { 16 | event.respondWith(handleRequest(event)) 17 | }) 18 | 19 | async function handleRequest({ request }) { 20 | try { 21 | if (request.method === 'GET') { 22 | const res = new Response(` 23 | 24 | 25 | 26 | 27 | Img color 28 | 29 | 30 | Upload an image (JPEG or PNG): 31 | 32 | 33 | 54 | 55 | 56 | `) 57 | res.headers.set('content-type', 'text/html') 58 | return res 59 | } 60 | 61 | if (request.method === 'POST') { 62 | const [data, base64] = (await request.text()).split(',') 63 | 64 | if (data === 'data:image/jpeg;base64') { 65 | var rawImageData = jpeg.decode(base64ToArrayBuffer(base64)) 66 | return new Response(meanRgba(rawImageData.width, rawImageData.height, rawImageData.data)) 67 | } 68 | 69 | if (data === 'data:image/png;base64') { 70 | return await new Promise(ok => { 71 | str(base64ToArrayBuffer(base64)) 72 | .pipe( 73 | new PNG({ 74 | filterType: 4, 75 | }) 76 | ) 77 | .on('parsed', function() { 78 | ok(new Response(meanRgba(this.width, this.height, this.data))) 79 | }) 80 | }) 81 | } 82 | 83 | return new Response('unsupported: ' + data, { status: 400 }) 84 | } 85 | 86 | return new Response('not found', { status: 404 }) 87 | } catch (err) { 88 | console.log(err) 89 | return new Response(err.stack, { status: 500 }) 90 | } 91 | } 92 | 93 | function meanRgba(w, h, matrix) { 94 | const size = w * h 95 | const rgb = [0, 0, 0] 96 | for (var y = 0; y < h; y++) { 97 | for (var x = 0; x < w; x++) { 98 | var idx = (w * y + x) << 2 99 | rgb[0] += matrix[idx] 100 | rgb[1] += matrix[idx + 1] 101 | rgb[2] += matrix[idx + 2] 102 | } 103 | } 104 | 105 | return [Math.floor(rgb[0] / size), Math.floor(rgb[1] / size), Math.floor(rgb[2] / size)] 106 | } 107 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "author": "{{ authors }}", 3 | "version": "1.0.0", 4 | "scripts": { 5 | "test": "echo \"Error: no test specified\" && exit 1" 6 | }, 7 | "dependencies": { 8 | "jpeg-js": "^0.3.5", 9 | "pngjs": "^3.4.0", 10 | "string-to-stream": "^1.1.1" 11 | }, 12 | "description": "A template for kick starting a Cloudflare Workers project", 13 | "main": "./index.js", 14 | "license": "MIT" 15 | } 16 | -------------------------------------------------------------------------------- /wrangler.toml: -------------------------------------------------------------------------------- 1 | name = "img-color" 2 | type = "webpack" 3 | 4 | account_id = "" 5 | workers_dev = true 6 | route = "" 7 | zone_id = "" 8 | --------------------------------------------------------------------------------