Repository: msasanmh/cf-workers-dns-over-https
Branch: main
Commit: b9759520f71c
Files: 6
Total size: 12.1 KB

Directory structure:
gitextract_z_h251ch/

├── .github/
│   └── workflows/
│       └── main.yml
├── LICENSE
├── README.md
├── index.js
├── package.json
└── wrangler.toml

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FILE CONTENTS
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================================================
FILE: .github/workflows/main.yml
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# This is a basic workflow to help you get started with Actions

name: CI

# Controls when the action will run. 
on:
  # Triggers the workflow on push or pull request events but only for the main branch
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:
  repository_dispatch:

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "build"
  build:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v3
      - name: Install Dependencies
        run: npm install
      - name: Deploy to Cloudflare Workers with Wrangler
        uses: cloudflare/wrangler-action@2.0.0
        with: 
          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          command: publish
        env:
          CLOUDFLARE_ACCOUNT_ID: ${{secrets.CLOUDFLARE_ACCOUNT_ID}}


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FILE: LICENSE
================================================
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================================================
FILE: README.md
================================================
# cf-workers-dns-over-https
A very minimalist DNS-over-HTTPS proxy on Cloudflare Workers.

Sign up for a free [Cloudflare Workers](https://workers.cloudflare.com/) account, create a new worker, replace the Script with the content of [index.js](/index.js), deploy the worker, and you're done, use the address anywhere DoH is accepted (AdGuard, browsers secure DNS settings, YogaDNS, Intra, Nebulo etc). Feel free to replace the `doh` variable with [any DNS-over-HTTPS server you want](https://github.com/curl/curl/wiki/DNS-over-HTTPS). Confirmed to work with Cloudflare itself, Google, and NextDNS. The rarely supported [JSON API](https://developers.google.com/speed/public-dns/docs/doh/json) is available through the `dohjson` variable. Some providers use identical URL (Cloudlfare, NextDNS), some use `/resolve` instead of `/dns-query` for path (Google, AdGuard).

Why? In case ISPs start banning known DoH providers, you can use your own proxy. Even if they block workers.dev wholesale, you can use your own domain (it must be hosted on Cloudflare, add a CNAME record targeting anything and bind the route from your website Workers tab). If you want to use domain not hosted on Cloudflare, use [doh-cf-pages](https://github.com/tina-hello/doh-cf-pages) instead, where even CNAME records from [FreeDNS](https://freedns.afraid.org/) is enough for custom domain.

Daily request on free tier is limited to 100 thousands, should be enough for most personal use, or even a family.

Final address should be like:<br>
https://XXX.UserName.workers.dev/dns-query

Want more control of the filter? Use [serverless-dns](https://github.com/serverless-dns/serverless-dns) which powers [RethinkDNS](https://rethinkdns.com/)

Want to host on Google Cloud Function or see how this is implemented in .NET? Use my [doh-gcf](https://github.com/tina-hello/doh-gcf)


================================================
FILE: index.js
================================================
addEventListener('fetch', function(event) {
    const { request } = event
    const response = handleRequest(request)
    event.respondWith(response)
})

// request path. Please modify this path to prevent everyone from using this worker.
const endpointPath = '/dns-query';

// you can replace below server with any other DoH servers.
const doh = 'https://dns.google/dns-query'

// NOTE: below server is in JSON format. For example Google DoH JSON is https://dns.google/resolve (it's not always dns-query).
const dohjson = 'https://dns.google/resolve'

const contype = 'application/dns-message'
const jstontype = 'application/dns-json'

async function handleRequest(request) {
    const clientUrl = new URL(request.url);
    const { method, headers, url } = request
    const searchParams = new URL(url).searchParams
    if (clientUrl.pathname != endpointPath) {
        return new Response('Not Found. HTTP 404.', { status: 404 });
    } else if (method == 'GET' && searchParams.has('dns')) {
        return await fetch(doh + '?dns=' + searchParams.get('dns'), {
            method: 'GET',
            headers: {
                'Accept': contype,
            }
        });
    } else if (method == 'POST' && headers.get('content-type') == contype) {
        return await fetch(doh, {
            method: 'POST',
            headers: {
                'Accept': contype,
                'Content-Type': contype,
            },
            body: await request.arrayBuffer()
        });
    } else if (method == 'GET' && headers.get('Accept') == jstontype) {
        const search = new URL(url).search
         return await fetch(dohjson + search, {
            method: 'GET',
            headers: {
                'Accept': jstontype,
            }
        });
    } else {
        return new Response("Not Found. HTTP 404.", {status: 404})
    }
}


================================================
FILE: package.json
================================================
{
  "private": true,
  "name": "doh",
  "version": "1.0.0",
  "description": "Basic DNS-over-HTTPS proxy on Cloudflare Workers",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "format": "prettier --write '**/*.{js,css,json,md}'"
  },
  "author": "tina-hello",
  "license": "CC0-1.0",
  "devDependencies": {
    "prettier": "^1.18.2"
  }
}


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FILE: wrangler.toml
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name = "doh"
workers_dev = true
compatibility_date = "2022-10-21"
main = "index.js"