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use axum::{
extract::{Form, Path, State},
response::{
sse::{self, Sse},
IntoResponse, Redirect,
},
routing::{get, post},
Router,
};
use axum_extra::TypedHeader;
use chrono::{format::SecondsFormat, DateTime};
use futures::{future, stream::TryStreamExt as _};
use super::{
header::LastEventId,
repo::{channels::Id as ChannelId, messages::BroadcastMessage},
};
use crate::{
app::App, clock::RequestedAt, error::BoxedError, error::InternalError,
login::repo::logins::Login,
};
pub fn router() -> Router<App> {
Router::new()
.route("/create", post(on_create))
.route("/:channel/send", post(on_send))
.route("/:channel/events", get(on_events))
}
#[derive(serde::Deserialize)]
struct CreateRequest {
name: String,
}
async fn on_create(
State(app): State<App>,
_: Login, // requires auth, but doesn't actually care who you are
Form(form): Form<CreateRequest>,
) -> Result<impl IntoResponse, InternalError> {
app.channels().create(&form.name).await?;
Ok(Redirect::to("/"))
}
#[derive(serde::Deserialize)]
struct SendRequest {
message: String,
}
async fn on_send(
Path(channel): Path<ChannelId>,
RequestedAt(sent_at): RequestedAt,
State(app): State<App>,
login: Login,
Form(form): Form<SendRequest>,
) -> Result<impl IntoResponse, InternalError> {
app.channels()
.send(&login, &channel, &form.message, &sent_at)
.await?;
Ok(Redirect::to(&format!("/{}", channel)))
}
async fn on_events(
Path(channel): Path<ChannelId>,
State(app): State<App>,
_: Login, // requires auth, but doesn't actually care who you are
last_event_id: Option<TypedHeader<LastEventId>>,
) -> Result<impl IntoResponse, InternalError> {
let resume_at = last_event_id
.map(|TypedHeader(header)| header)
.map(|LastEventId(header)| header)
.map(|header| DateTime::parse_from_rfc3339(&header))
.transpose()?
.map(|ts| ts.to_utc());
let stream = app
.channels()
.events(&channel, resume_at.as_ref())
.await?
.and_then(|msg| future::ready(to_event(msg)));
Ok(Sse::new(stream).keep_alive(sse::KeepAlive::default()))
}
fn to_event(msg: BroadcastMessage) -> Result<sse::Event, BoxedError> {
let data = serde_json::to_string(&msg)?;
let event = sse::Event::default()
.id(msg
.sent_at
.to_rfc3339_opts(SecondsFormat::AutoSi, /* use_z */ true))
.data(&data);
Ok(event)
}
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