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|
use crate::config::WebhookConfig;
use async_nats::Client;
use ed25519_dalek::PublicKey;
use error::WebhookError;
use hyper::{
body::{to_bytes, Bytes},
service::Service,
Body, Method, Request, Response, StatusCode,
};
use shared::payloads::{CachePayload, DispatchEventTagged};
use signature::validate_signature;
use std::{
future::Future,
pin::Pin,
str::from_utf8,
task::{Context, Poll},
};
use tracing::{debug, error};
use twilight_model::gateway::event::DispatchEvent;
use twilight_model::{
application::interaction::{Interaction, InteractionType},
gateway::payload::incoming::InteractionCreate,
};
mod error;
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: WebhookConfig,
pub nats: Client,
}
impl WebhookService {
async fn check_request(req: Request<Body>, pk: PublicKey) -> Result<Bytes, WebhookError> {
if req.method() == Method::POST {
let signature = if let Some(sig) = req.headers().get("X-Signature-Ed25519") {
sig.to_owned()
} else {
return Err(WebhookError::new(
StatusCode::BAD_REQUEST,
"missing signature header",
));
};
let timestamp = if let Some(timestamp) = req.headers().get("X-Signature-Timestamp") {
timestamp.to_owned()
} else {
return Err(WebhookError::new(
StatusCode::BAD_REQUEST,
"missing timestamp header",
));
};
let data = to_bytes(req.into_body()).await?;
if validate_signature(
&pk,
&[timestamp.as_bytes().to_vec(), data.to_vec()].concat(),
signature.to_str()?,
) {
Ok(data)
} else {
Err(WebhookError::new(
StatusCode::UNAUTHORIZED,
"invalid signature",
))
}
} else {
Err(WebhookError::new(StatusCode::NOT_FOUND, "not found"))
}
}
async fn process_request(
req: Request<Body>,
nats: Client,
pk: PublicKey,
) -> Result<Response<Body>, WebhookError> {
match Self::check_request(req, pk).await {
Ok(data) => {
let utf8 = from_utf8(&data);
match utf8 {
Ok(data) => match serde_json::from_str::<Interaction>(data) {
Ok(value) => {
match value.kind {
InteractionType::Ping => Ok(Response::builder()
.header("Content-Type", "application/json")
.body(r#"{"type":1}"#.into())
.unwrap()),
_ => {
debug!("calling nats");
// this should hopefully not fail ?
let data = CachePayload {
data: DispatchEventTagged {
data: DispatchEvent::InteractionCreate(Box::new(
InteractionCreate(value),
)),
},
};
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(WebhookError::new(
StatusCode::INTERNAL_SERVER_ERROR,
"failed to request nats",
))
}
}
}
}
}
Err(error) => {
error!("invalid json body: {}", error);
Err(WebhookError::new(
StatusCode::BAD_REQUEST,
"invalid json body",
))
}
},
Err(_) => Err(WebhookError::new(StatusCode::BAD_REQUEST, "not utf-8 body")),
}
}
Err(error) => Err(error),
}
}
}
/// Implementation of the service
impl Service<hyper::Request<Body>> for WebhookService {
type Response = hyper::Response<Body>;
type Error = hyper::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) => Ok(e.into()),
}
})
}
}
|
