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|
use crate::config::Webhook;
use anyhow::bail;
use async_nats::Client;
use ed25519_dalek::PublicKey;
use hyper::{
body::{to_bytes, Bytes},
service::Service,
Body, Method, Request, Response,
};
use shared::payloads::{CachePayload, DispatchEventTagged};
use signature::validate;
use std::{
future::Future,
pin::Pin,
task::{Context, Poll},
};
use tracing::{debug, error};
use twilight_model::gateway::event::DispatchEvent;
use twilight_model::{
application::interaction::{Interaction, InteractionType},
gateway::payload::incoming::InteractionCreate,
};
pub mod make_service;
mod signature;
#[cfg(test)]
pub mod tests;
/// Hyper service used to handle the discord webhooks
#[derive(Clone)]
pub struct WebhookService {
pub config: Webhook,
pub nats: Client,
}
impl WebhookService {
async fn check_request(req: Request<Body>, pk: PublicKey) -> Result<Bytes, anyhow::Error> {
if req.method() == Method::POST {
let signature = if let Some(sig) = req.headers().get("X-Signature-Ed25519") {
sig.clone()
} else {
bail!("Missing signature header");
};
let timestamp = if let Some(timestamp) = req.headers().get("X-Signature-Timestamp") {
timestamp.clone()
} else {
bail!("Missing timestamp header");
};
let data = to_bytes(req.into_body()).await?;
if validate(
&pk,
&[timestamp.as_bytes().to_vec(), data.to_vec()].concat(),
signature.to_str()?,
) {
Ok(data)
} else {
bail!("invalid signature");
}
} else {
bail!("not found");
}
}
async fn process_request(
req: Request<Body>,
nats: Client,
pk: PublicKey,
) -> Result<Response<Body>, anyhow::Error> {
let data = Self::check_request(req, pk).await?;
let interaction: Interaction = serde_json::from_slice(&data)?;
if interaction.kind == InteractionType::Ping {
Ok(Response::builder()
.header("Content-Type", "application/json")
.body(r#"{"type":1}"#.into())
.unwrap())
} else {
debug!("calling nats");
// this should hopefully not fail ?
let data = CachePayload {
data: DispatchEventTagged {
data: DispatchEvent::InteractionCreate(Box::new(InteractionCreate(
interaction,
))),
},
};
let payload = serde_json::to_string(&data).unwrap();
match nats
.request(
"nova.cache.dispatch.INTERACTION_CREATE".to_string(),
Bytes::from(payload),
)
.await
{
Ok(response) => Ok(Response::builder()
.header("Content-Type", "application/json")
.body(Body::from(response.payload))
.unwrap()),
Err(error) => {
error!("failed to request nats: {}", error);
Err(anyhow::anyhow!("internal error"))
}
}
}
}
}
/// Implementation of the service
impl Service<hyper::Request<Body>> for WebhookService {
type Response = hyper::Response<Body>;
type Error = anyhow::Error;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
fn poll_ready(&mut self, _: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, req: Request<Body>) -> Self::Future {
let future = Self::process_request(req, self.nats.clone(), self.config.discord.public_key);
Box::pin(async move {
let response = future.await;
match response {
Ok(r) => Ok(r),
Err(e) => Err(e),
}
})
}
}
|
