victor23k
Proposal
I propose to add the Plug.Conn struct available inside the MFA configured for Phoenix.Endpoint.socket/3 under check_origin.
Benefits
This would make possible to use url params or headers to check if the origin is allowed. Example: passing a user_id param in the url, then checking somewhere else if the Origin is allowed by that user.
Changes
The actual change seems quite simple as conn is already present when the MFA is applied so. It would just need tests and modifying the documentation.
https://github.com/phoenixframework/phoenix/blob/83e4b3245f7cdc85b6c562860477500db9c72697/lib/phoenix/socket/transport.ex#L583-L584
I would be more than happy to send the PR.
Where Next?
Trending in Proposals: Ideas
Other Trending Topics
Latest Phoenix Threads
Latest on Elixir Forum
Sponsor Spotlight
Deploy Phoenix to your own VPS with PaaS ease: push-to-deploy, zero downtime, auto SSL, managed Postgres. 14-day free trial at potions.io
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixirconf-us
- #ai
- #blog-post
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #hex
- #security
- #metaprogramming
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Master modern tools, write cleaner code, and tackle real-world challenges.
Bringing learning, work and compliance together since 1987.
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 2- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
steffend
Hey @victor23k,
the issue with the proposal is that any change to the arguments here would be a breaking change. So it’s not something we can easily do.
An ugly solution if you need this could be to have a plug before the socket and store data you need in the process dictionary and then access it from there later.
victor23k
You are right. Thanks for the workaround!