server/src/routes/images.rs

   1 use crate::rate_limit::RateLimit;
   2 use actix::clock::Duration;
   3 use actix_web::{body::BodyStream, http::StatusCode, *};
   4 use awc::Client;
   5 use lemmy_utils::settings::Settings;
   6 use serde::{Deserialize, Serialize};
   7
   8 const THUMBNAIL_SIZES: &[u64] = &[256];
   9
  10 pub fn config(cfg: &mut web::ServiceConfig, rate_limit: &RateLimit) {
  11   let client = Client::build()
  12     .header("User-Agent", "pict-rs-frontend, v0.1.0")
  13     .timeout(Duration::from_secs(30))
  14     .finish();
  15
  16   cfg
  17     .data(client)
  18     .service(
  19       web::resource("/pictrs/image")
  20         .wrap(rate_limit.image())
  21         .route(web::post().to(upload)),
  22     )
  23     .service(web::resource("/pictrs/image/{filename}").route(web::get().to(full_res)))
  24     .service(
  25       web::resource("/pictrs/image/thumbnail{size}/{filename}").route(web::get().to(thumbnail)),
  26     )
  27     .service(web::resource("/pictrs/image/delete/{token}/{filename}").route(web::get().to(delete)));
  28 }
  29
  30 #[derive(Debug, Serialize, Deserialize)]
  31 pub struct Image {
  32   file: String,
  33   delete_token: String,
  34 }
  35
  36 #[derive(Debug, Serialize, Deserialize)]
  37 pub struct Images {
  38   msg: String,
  39   files: Option<Vec<Image>>,
  40 }
  41
  42 async fn upload(
  43   req: HttpRequest,
  44   body: web::Payload,
  45   client: web::Data<Client>,
  46 ) -> Result<HttpResponse, Error> {
  47   // TODO: check auth and rate limit here
  48
  49   let mut res = client
  50     .request_from(format!("{}/image", Settings::get().pictrs_url), req.head())
  51     .if_some(req.head().peer_addr, |addr, req| {
  52       req.header("X-Forwarded-For", addr.to_string())
  53     })
  54     .send_stream(body)
  55     .await?;
  56
  57   let images = res.json::<Images>().await?;
  58
  59   Ok(HttpResponse::build(res.status()).json(images))
  60 }
  61
  62 async fn full_res(
  63   filename: web::Path<String>,
  64   req: HttpRequest,
  65   client: web::Data<Client>,
  66 ) -> Result<HttpResponse, Error> {
  67   let url = format!(
  68     "{}/image/{}",
  69     Settings::get().pictrs_url,
  70     &filename.into_inner()
  71   );
  72   image(url, req, client).await
  73 }
  74
  75 async fn thumbnail(
  76   parts: web::Path<(u64, String)>,
  77   req: HttpRequest,
  78   client: web::Data<Client>,
  79 ) -> Result<HttpResponse, Error> {
  80   let (size, file) = parts.into_inner();
  81
  82   if THUMBNAIL_SIZES.contains(&size) {
  83     let url = format!(
  84       "{}/image/thumbnail{}/{}",
  85       Settings::get().pictrs_url,
  86       size,
  87       &file
  88     );
  89
  90     return image(url, req, client).await;
  91   }
  92
  93   Ok(HttpResponse::NotFound().finish())
  94 }
  95
  96 async fn image(
  97   url: String,
  98   req: HttpRequest,
  99   client: web::Data<Client>,
 100 ) -> Result<HttpResponse, Error> {
 101   let res = client
 102     .request_from(url, req.head())
 103     .if_some(req.head().peer_addr, |addr, req| {
 104       req.header("X-Forwarded-For", addr.to_string())
 105     })
 106     .no_decompress()
 107     .send()
 108     .await?;
 109
 110   if res.status() == StatusCode::NOT_FOUND {
 111     return Ok(HttpResponse::NotFound().finish());
 112   }
 113
 114   let mut client_res = HttpResponse::build(res.status());
 115
 116   for (name, value) in res.headers().iter().filter(|(h, _)| *h != "connection") {
 117     client_res.header(name.clone(), value.clone());
 118   }
 119
 120   Ok(client_res.body(BodyStream::new(res)))
 121 }
 122
 123 async fn delete(
 124   components: web::Path<(String, String)>,
 125   req: HttpRequest,
 126   client: web::Data<Client>,
 127 ) -> Result<HttpResponse, Error> {
 128   let (token, file) = components.into_inner();
 129
 130   let url = format!(
 131     "{}/image/delete/{}/{}",
 132     Settings::get().pictrs_url,
 133     &token,
 134     &file
 135   );
 136   let res = client
 137     .request_from(url, req.head())
 138     .if_some(req.head().peer_addr, |addr, req| {
 139       req.header("X-Forwarded-For", addr.to_string())
 140     })
 141     .no_decompress()
 142     .send()
 143     .await?;
 144
 145   Ok(HttpResponse::build(res.status()).body(BodyStream::new(res)))
 146 }