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use std::env;
use std::net::SocketAddr;
use std::sync::Arc;
use hyper::{Body, Method, Request, Response, Server};
use hyper::client::{Client, HttpConnector};
use hyper::service::{make_service_fn, service_fn};
use hyper_tls::HttpsConnector;
async fn get_user_data(client: &Client<HttpsConnector<HttpConnector>>, token: &str, user_id: u64) -> anyhow::Result<serde_json::Value> {
let request = Request::builder()
.method(Method::GET)
.uri(format!("https://discord.com/api/v10/users/{}", user_id))
.header("accept", "application/json")
.header("authorization", format!("Bot {}", token))
.body(Body::empty())?;
let mut x = client.request(request).await?;
let body = hyper::body::to_bytes(x.body_mut()).await?;
let json_data = String::from_utf8(Vec::from(body))?;
let json: serde_json::Value = serde_json::from_str(&json_data)?;
Ok(json)
}
async fn get_avatar_url(client: &Client<HttpsConnector<HttpConnector>>, token: &str, user_id: u64) -> anyhow::Result<String> {
let json = get_user_data(client, token, user_id).await?;
let id = json["id"].as_str().ok_or(anyhow::anyhow!("Missing avatar"))?;
let discrim = json["discriminator"].as_str().ok_or(anyhow::anyhow!("Missing discriminator"))?;
println!("Served request for {}: {}#{}", id, json["username"], discrim);
let avatar_url = match json["avatar"].as_str() {
None => default_avatar_url(discrim)?,
Some(avatar_hash) => format!("https://cdn.discordapp.com/avatars/{}/{}.png", id, avatar_hash)
};
Ok(avatar_url)
}
fn make_err(err: u16, text: &str) -> anyhow::Result<Response<Body>> {
return Ok(Response::builder()
.status(err)
.body(format!("{} {}", err, text).into())?);
}
async fn resp(arc: Arc<Ctx>, req: Request<Body>) -> anyhow::Result<Response<Body>> {
let x = req.uri().path();
if x == "/" {
return Ok(Response::builder()
.status(302)
.header("Location", "https://git.nea.moe/nea/discordavatarproxy")
.body(Body::empty())?);
}
let request = match x.strip_prefix("/avatar/") {
None => return make_err(404, "Not found"),
Some(request) => request,
};
if let Some(userid) = request.strip_suffix(".png") {
return respond_with_image(arc, userid).await;
}
if let Some(userid) = request.strip_suffix(".json") {
return respond_with_json(arc, userid).await;
}
return make_err(404, "Invalid format");
}
fn default_avatar_url(discrim: &str) -> anyhow::Result<String> {
let d = discrim.parse::<u16>()?;
let bare = d % 5;
Ok(format!("https://cdn.discordapp.com/embed/avatars/{}.png", bare))
}
struct ResponseUserFormat {
username: String,
discriminator: String,
avatar: String,
banner: Option<String>,
}
async fn respond_with_json(arc: Arc<Ctx>, userid: &str) -> anyhow::Result<Response<Body>> {
let num_id = match userid.parse::<u64>() {
Err(_) => return make_err(404, "Not found"),
Ok(num) => num,
};
Ok(Response::builder()
.status(200)
.header("content-type", "application/json")
.body(serde_json::to_string("{\"todo\": true}")?.into())?)
}
async fn respond_with_image(arc: Arc<Ctx>, userid: &str) -> anyhow::Result<Response<Body>> {
let num_id = match userid.parse::<u64>() {
Err(_) => return make_err(404, "Not found"),
Ok(num) => num,
};
let avatar_url = match get_avatar_url(&arc.client, &arc.token, num_id).await {
Err(_) => return make_err(502, "Discord failed to respond"),
Ok(avatar_url) => avatar_url,
};
let resp = match arc.client.get(avatar_url.parse()?).await {
Err(_) => return make_err(502, &format!("Discord failed to supply avatar for url: {}", avatar_url)),
Ok(avatar_data) => avatar_data,
};
Ok(Response::builder()
.status(200)
.header("content-type", "image/png")
.body(resp.into_body())?)
}
struct Ctx {
client: Client<HttpsConnector<HttpConnector>>,
token: String,
}
async fn wrap_error(arc: Arc<Ctx>, req: Request<Body>) -> anyhow::Result<Response<Body>> {
return match resp(arc, req).await {
Err(e) => {
eprintln!("{:?}", e);
Ok(Response::builder()
.status(500)
.body("500 Internal Error".into())?)
}
Ok(o) => Ok(o)
};
}
#[tokio::main]
async fn main() -> anyhow::Result<()> {
let token = env::var("TOKEN")?;
let portstr = env::var("PORT")?;
let port = portstr.parse::<u16>()?;
println!("Running with token: {}", token);
let https = HttpsConnector::new();
let client = Client::builder()
.build::<_, Body>(https);
let arc = Arc::new(Ctx { client, token });
let addr = SocketAddr::from(([127, 0, 0, 1], port));
let service = make_service_fn(|_conn| {
let carc = Arc::clone(&arc);
async move {
Ok::<_, anyhow::Error>(service_fn(move |req| { wrap_error(Arc::clone(&carc), req) }))
}
});
let server = Server::bind(&addr).serve(service);
server.await?;
Ok(())
}
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