├── .prettierrc ├── .gitignore ├── package.json ├── wrangler.toml ├── LICENSE_MIT ├── README.md ├── CODE_OF_CONDUCT.md ├── index.js └── LICENSE_APACHE /.prettierrc: -------------------------------------------------------------------------------- 1 | { 2 | "singleQuote": true, 3 | "semi": false, 4 | "trailingComma": "all", 5 | "tabWidth": 2, 6 | "printWidth": 80 7 | } 8 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | /dist 3 | **/*.rs.bk 4 | Cargo.lock 5 | bin/ 6 | pkg/ 7 | wasm-pack.log 8 | worker/ 9 | node_modules/ 10 | .cargo-ok 11 | .env -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "private": true, 3 | "name": "cf-b2-webhook", 4 | "version": "1.0.0", 5 | "description": "A template for kick starting a Cloudflare Workers project", 6 | "main": "index.js", 7 | "scripts": { 8 | "test": "echo \"Error: no test specified\" && exit 1", 9 | "format": "prettier --write '**/*.{js,css,json,md}'" 10 | }, 11 | "author": "ppatterson ", 12 | "license": "MIT", 13 | "devDependencies": { 14 | "prettier": "^1.18.2" 15 | }, 16 | "dependencies": { 17 | "aws4fetch": "^1.0.13" 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /wrangler.toml: -------------------------------------------------------------------------------- 1 | name = "cloudflare-b2-proxy" 2 | type = "webpack" 3 | 4 | account_id = "" 5 | workers_dev = true 6 | route = "" 7 | zone_id = "" 8 | compatibility_date = "2022-02-24" 9 | 10 | # Don't put your application key in this file! 11 | # You should set it as a secret in the Cloudflare dashboard or at the command line: 12 | # echo "" | wrangler secret put AWS_SECRET_ACCESS_KEY 13 | [vars] 14 | AWS_ACCESS_KEY_ID = "" 15 | AWS_SECRET_ACCESS_KEY = "Remove this line after you make AWS_SECRET_ACCESS_KEY a secret in the UI!" 16 | AWS_S3_ENDPOINT = "" 17 | # WEBHOOK_URL is optional - you can set it to an empty string 18 | WEBHOOK_URL = "" 19 | -------------------------------------------------------------------------------- /LICENSE_MIT: -------------------------------------------------------------------------------- 1 | Copyright (c) 2018 Ashley Williams 2 | 3 | Permission is hereby granted, free of charge, to any 4 | person obtaining a copy of this software and associated 5 | documentation files (the "Software"), to deal in the 6 | Software without restriction, including without 7 | limitation the rights to use, copy, modify, merge, 8 | publish, distribute, sublicense, and/or sell copies of 9 | the Software, and to permit persons to whom the Software 10 | is furnished to do so, subject to the following 11 | conditions: 12 | 13 | The above copyright notice and this permission notice 14 | shall be included in all copies or substantial portions 15 | of the Software. 16 | 17 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF 18 | ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED 19 | TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 20 | PARTICULAR PURPOSE AND NONINFRINGEMENT. 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 | # Cloudflare Worker Backblaze B2 Proxy 2 | 3 | Proxy Backblaze S3 compatible API requests, optionally sending notifications to a webhook. 4 | 5 | * Incoming requests must be signed with the same credentials that you configure in the worker. The worker validates the AWS V4 signature on all downstream (incoming) requests and then signs the upstream (outgoing) request. 6 | * Notifications are dispatched asynchronously to avoid delaying the response to the client. 7 | 8 | You can use any S3 SDK or CLI to send requests as long as you set the endpoint URL to the worker endpoint. For example: 9 | 10 | ```bash 11 | % export AWS_ACCESS_KEY_ID= 12 | % export AWS_SECRET_ACCESS_KEY= 13 | % export AWS_REGION= 14 | % aws s3 cp --endpoint-url https://cloudflare-b2-proxy..workers.dev hello.txt s3:///hello.txt 15 | upload: hello.txt to s3:///hello.txt 16 | ``` 17 | __Note that your configuration in `~/.aws/` may override authentication and/or region and cause 403s.__ 18 | 19 | Informal testing suggests that there is negligible performance overhead imposed by the signature verification and resigning. 20 | 21 | ## Configuration 22 | 23 | You must configure `AWS_ACCESS_KEY_ID` and `AWS_S3_ENDPOINT` in `wrangler.toml`. Configure `WEBHOOK_URL` if you wish to supply a webhook URL. 24 | 25 | ```toml 26 | [vars] 27 | AWS_ACCESS_KEY_ID = "" 28 | AWS_S3_ENDPOINT = "" 29 | WEBHOOK_URL = "" 30 | ``` 31 | 32 | You must also configure `AWS_SECRET_ACCESS_KEY` as a [secret](https://blog.cloudflare.com/workers-secrets-environment/): 33 | 34 | ```bash 35 | echo "" | wrangler secret put AWS_SECRET_ACCESS_KEY 36 | ``` 37 | 38 | ## Webhook Notification 39 | 40 | If you set `WEBHOOK_URL`, the worker POSTs a JSON payload to that URL for each request that it processes. For example: 41 | 42 | ```json 43 | { 44 | "contentLength": "14", 45 | "contentType": "text/plain", 46 | "method": "PUT", 47 | "signatureTimestamp": "20220224T193204Z", 48 | "status": 200, 49 | "url": "https://s3.us-west-004.backblazeb2.com/my-private-bucket/tester.txt" 50 | } 51 | ``` 52 | 53 | You can customize the `handleRequest()` function to add additional data as you require. 54 | 55 | ## Wrangler 56 | 57 | You can use this repository as a template for your own worker using [`wrangler`](https://github.com/cloudflare/wrangler): 58 | 59 | ```bash 60 | wrangler generate projectname https://github.com/backblaze-b2-samples/cloudflare-b2-proxy 61 | ``` 62 | 63 | ## Serverless 64 | 65 | To deploy using serverless add a [`serverless.yml`](https://serverless.com/framework/docs/providers/cloudflare/) file. 66 | 67 | 68 | ## Acknowledgements 69 | 70 | Based on [https://github.com/obezuk/worker-signed-s3-template](https://github.com/obezuk/worker-signed-s3-template) 71 | -------------------------------------------------------------------------------- /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 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | // 2 | // Proxy Backblaze S3 compatible API requests, sending notifications to a webhook 3 | // 4 | // Adapted from https://github.com/obezuk/worker-signed-s3-template 5 | // 6 | import { AwsClient } from 'aws4fetch' 7 | 8 | // Extract the region from the endpoint 9 | 10 | const endpointRegex = /^s3\.([a-zA-Z0-9-]+)\.backblazeb2\.com$/; 11 | const [ , aws_region] = AWS_S3_ENDPOINT.match(endpointRegex); 12 | 13 | const aws = new AwsClient({ 14 | "accessKeyId": AWS_ACCESS_KEY_ID, 15 | "secretAccessKey": AWS_SECRET_ACCESS_KEY, 16 | "service": "s3", 17 | "region": aws_region, 18 | }); 19 | 20 | const unsignedError = 21 | ` 22 | 23 | AccessDenied 24 | Unauthenticated requests are not allowed for this api 25 | `; 26 | 27 | // Could add more detail regarding the specific error, but this enough for now 28 | const validationError = 29 | ` 30 | 31 | 32 | Sender 33 | SignatureDoesNotMatch 34 | Signature validation failed. 35 | 36 | 0300D815-9252-41E5-B587-F189759A21BF 37 | `; 38 | 39 | 40 | addEventListener('fetch', function(event) { 41 | event.respondWith(handleRequest(event)) 42 | }); 43 | 44 | 45 | // These headers appear in the request, but are not passed upstream 46 | const UNSIGNABLE_HEADERS = [ 47 | 'x-forwarded-proto', 48 | 'x-real-ip', 49 | ] 50 | 51 | 52 | // Filter out cf-* and any other headers we don't want to include in the signature 53 | function filterHeaders(headers) { 54 | return Array.from(headers.entries()) 55 | .filter(pair => !UNSIGNABLE_HEADERS.includes(pair[0]) && !pair[0].startsWith('cf-')); 56 | } 57 | 58 | 59 | function SignatureMissingException() {} 60 | 61 | 62 | function SignatureInvalidException() {} 63 | 64 | 65 | // Verify the signature on the incoming request 66 | async function verifySignature(request) { 67 | const authorization = request.headers.get('Authorization'); 68 | if (!authorization) { 69 | throw new SignatureMissingException(); 70 | } 71 | 72 | // Parse the AWS V4 signature value 73 | const re = /^AWS4-HMAC-SHA256 Credential=([^,]+),\s*SignedHeaders=([^,]+),\s*Signature=(.+)$/; 74 | let [ , credential, signedHeaders, signature] = authorization.match(re); 75 | 76 | credential = credential.split('/'); 77 | signedHeaders = signedHeaders.split(';'); 78 | 79 | // Verify that the request was signed with the expected key 80 | if (credential[0] != AWS_ACCESS_KEY_ID) { 81 | throw new SignatureInvalidException(); 82 | } 83 | 84 | // Use the timestamp from the incoming signature 85 | const datetime = request.headers.get('x-amz-date'); 86 | 87 | // Extract the headers that we want from the complete set of incoming headers 88 | const headersToSign = signedHeaders 89 | .map(key => ({ 90 | name: key, 91 | value: request.headers.get(key) 92 | })) 93 | .reduce((obj, item) => (obj[item.name] = item.value, obj), {}); 94 | 95 | const signedRequest = await aws.sign(request.url, { 96 | method: request.method, 97 | headers: headersToSign, 98 | body: request.body, 99 | aws: { datetime: datetime, allHeaders:true } 100 | }); 101 | 102 | // All we need is the signature component of the Authorization header 103 | const [ , , , generatedSignature] = signedRequest.headers.get('Authorization').match(re); 104 | 105 | if (signature !== generatedSignature) { 106 | throw new SignatureInvalidException(); 107 | } 108 | } 109 | 110 | 111 | // Where the magic happens... 112 | async function handleRequest(event) { 113 | const request = event.request; 114 | 115 | // Set upstream target hostname. 116 | var url = new URL(request.url); 117 | url.hostname = AWS_S3_ENDPOINT; 118 | 119 | // Only handle requests signed by our configured key. 120 | try { 121 | await verifySignature(request); 122 | } catch (e) { 123 | // Signature is missing or bad - deny the request 124 | return new Response( 125 | (e instanceof SignatureMissingException) ? 126 | unsignedError : 127 | validationError, 128 | { 129 | status: 403, 130 | headers: { 131 | 'Content-Type': 'application/xml', 132 | 'Cache-Control': 'max-age=0, no-cache, no-store' 133 | } 134 | }); 135 | } 136 | 137 | // Certain headers appear in the incoming request but are 138 | // removed from the outgoing request. If they are in the 139 | // signed headers, B2 can't validate the signature. 140 | const headers = filterHeaders(request.headers); 141 | 142 | // Sign the new request 143 | var signedRequest = await aws.sign(url, { 144 | method: request.method, 145 | headers: headers, 146 | body: request.body 147 | }); 148 | 149 | // Send the signed request to B2 and wait for the upstream response 150 | const response = await fetch(signedRequest); 151 | 152 | if (WEBHOOK_URL) { 153 | // Convert content length from a string to an integer 154 | let contentLength = request.headers.get('content-length'); 155 | contentLength = contentLength ? parseInt(contentLength) : null; 156 | 157 | // This will fire the fetch to the webhook asynchronously so the 158 | // response is not delayed. 159 | event.waitUntil( 160 | fetch(WEBHOOK_URL, { 161 | method: 'POST', 162 | headers: { 163 | 'Content-Type': 'application/json' 164 | }, 165 | body: JSON.stringify({ 166 | contentLength: contentLength, 167 | contentType: request.headers.get('content-type'), 168 | method: request.method, 169 | signatureTimestamp: request.headers.get('x-amz-date'), 170 | status: response.status, 171 | url: response.url 172 | }) 173 | }) 174 | ); 175 | } 176 | 177 | return response; 178 | } 179 | -------------------------------------------------------------------------------- /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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