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WebhookSignature

A sample Phoenix app to help demonstrate how to validate the signature of a webhook payload in Elixir.

Blog post: https://phoenixbyexample.com/posts/securing-webhook-payload-delivery-in-phoenix/

Usage Demo

$ curl --verbose \
       -H "Content-Type: application/json" \
       -H "X-Hub-Signature: sha256=83f6ac8a267da03ba43b9a87b5b665fa8e303bd493dc6c90d44e07a19bf7cb8c" \
       -d '{"hello":"world"}' \
       http://127.0.0.1:4000/github/webhook

Output showing success, HTTP/1.1 200 OK:

*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 4000 (#0)
> POST /github/webhook HTTP/1.1
> Host: 127.0.0.1:4000
> User-Agent: curl/7.64.1
> Accept: */*
> Content-Type: application/json
> X-Hub-Signature: sha256=83f6ac8a267da03ba43b9a87b5b665fa8e303bd493dc6c90d44e07a19bf7cb8c
> Content-Length: 17
> 
* upload completely sent off: 17 out of 17 bytes
< HTTP/1.1 200 OK
< cache-control: max-age=0, private, must-revalidate
< content-length: 4
< content-type: application/json; charset=utf-8
< date: Mon, 22 Feb 2021 20:11:53 GMT
< server: Cowboy
< x-request-id: FmYq7ROzBOzPgWkAABIB
< 
* Connection #0 to host 127.0.0.1 left intact
null* Closing connection 0

Standard Phoenix Things

To start your Phoenix server:

  • Install dependencies with mix deps.get
  • Create and migrate your database with mix ecto.setup
  • Install Node.js dependencies with npm install inside the assets directory
  • Start Phoenix endpoint with mix phx.server

Now you can visit localhost:4000 from your browser.

Ready to run in production? Please check our deployment guides.

Learn more