Connecting to Firebase fails with invalid URL, scheme is not http

[konrad-xtention]

Since upgrading to Hedwig 2.1.0 the connection to Firebase fails.
This is printed to the log:
ERROR matrix_hedwig::error: fcm error: error sending request for url (https://fcm.googleapis.com/v1/projects/<snip>/messages:send): error trying to connect: invalid URL, scheme is not http

This is a duplicate of #159, which was closed without the bug actually being fixed.

[vanyasem]

I have tried applying a suggested fix from #159 by reverting ebc1804, but unfortunately this didn't solve the problem - productlabteam@1cd5c64

The error is exactly the same:

2024-11-01T21:11:26.111255Z ERROR matrix_hedwig::error: fcm error: error sending request for url (https://fcm.googleapis.com/v1/projects/nnm-im/messages:send): error trying to connect: invalid URL, scheme is not http
...
2024-11-01T21:11:33.867512Z  INFO matrix_hedwig::api: A push failed (device type: Ios), even after retrying: {
  "error": "Something went wrong while trying to interact with fcm",
  "errcode": "FCM_FAILED"
}

[vanyasem]

hedwig uses firebae-cm = "0.1.0", which is the first version of firebae-cm ever released available here: https://github.com/Vesafary/firebae-cm/tree/a2a2f035d3650b4eb9a9a14a831a07db13bf4baa

If we take a look at it's Cargo.toml, we might notice the lack of a specified TLS implementation for reqwest:

reqwest =           { version = "0.11.9", features = ["json"], default-features=false }`

You can see an explanation of why that's an issue here: seanmonstar/reqwest#2161

This was later fixed in this commit, adding a "rustls-tls" feature: Vesafary/firebae-cm@d0bf005, which went into firebae-cm = "0.3.0" release.

Unfortunately firebae-cm 0.3.0 has had breaking changes, and cannot be directly updated to without making changes to hedwig's codebase.

[vanyasem]

We made a fork of firebae-cm = "0.1.0" with the TLS fix backported: https://github.com/productlabteam/firebae-cm/tree/0.1.0

You can use our fixed fork of hedwig, or you can apply the patch directly: productlabteam@b7883b5