87 lines
3.0 KiB
Rust
87 lines
3.0 KiB
Rust
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use leptos::prelude::*;
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use serde::{Deserialize, Serialize};
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/// Call signaling for a room, kept entirely separate from `chat::ChatMessage`
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/// - deliberately a different NATS subject namespace (`call.room.<room>`,
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/// not `chat.room.<room>`) so `server::store`'s JetStream/Postgres archive
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/// (scoped to `chat.room.*` only) never sees it. Ephemeral SDP/ICE has no
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/// business being durably stored.
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pub fn call_subject(room: &str) -> String {
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format!("call.room.{room}")
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}
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/// `from`/`to` are peer ids - currently just the signed-in username (same
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/// identity chat messages use). `to: None` is a room-wide broadcast (only
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/// `Join`/`Leave` use this); everything else is directed at one peer, with
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/// every other browser in the room ignoring it client-side. Mesh calls at
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/// this scale (~4 people) don't need per-peer NATS subjects - broadcast +
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/// client-side filter is the simplest thing that works.
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#[derive(Clone, Debug, Serialize, Deserialize)]
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pub struct CallSignal {
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pub room: String,
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pub from: String,
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pub to: Option<String>,
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pub kind: CallSignalKind,
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}
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#[derive(Clone, Debug, Serialize, Deserialize)]
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#[serde(tag = "kind", content = "data")]
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pub enum CallSignalKind {
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/// Announces presence to the room; existing participants respond by
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/// initiating an offer to the new peer.
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Join,
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Leave,
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Offer(String),
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Answer(String),
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/// A single trickled ICE candidate, JSON-encoded
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/// (`RTCIceCandidateInit`, produced client-side).
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IceCandidate(String),
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}
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/// Publishes a call-signaling message to the room's signaling subject.
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/// Requires a signed-in, room-authorized session - same two checks as
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/// `chat::send_message`, and deliberately not shared via a helper since
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/// the existing chat functions already establish that each enforcement
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/// point re-does this small check inline rather than factoring it out.
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#[server]
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pub async fn send_signal(
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room: String,
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to: Option<String>,
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kind: CallSignalKind,
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) -> Result<(), ServerFnError> {
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use crate::auth::{User, SESSION_USER_KEY};
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use crate::chat::is_authorized_for_room;
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use crate::server::AppState;
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if !crate::chat::is_valid_room(&room) {
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return Err(ServerFnError::new("unknown room"));
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}
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let session: tower_sessions::Session = leptos_axum::extract().await?;
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let Some(user) = session
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.get::<User>(SESSION_USER_KEY)
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.await
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.map_err(|e| ServerFnError::new(e.to_string()))?
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else {
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return Err(ServerFnError::new("not signed in"));
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};
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if !is_authorized_for_room(&user, &room) {
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return Err(ServerFnError::new("not authorized for this room"));
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}
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let state = expect_context::<AppState>();
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let signal = CallSignal {
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room: room.clone(),
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from: user.username,
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to,
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kind,
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};
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let payload = serde_json::to_vec(&signal).map_err(|e| ServerFnError::new(e.to_string()))?;
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state
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.nats
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.publish(call_subject(&room), payload.into())
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.await
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.map_err(|e| ServerFnError::new(format!("nats publish failed: {e}")))?;
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Ok(())
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}
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