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use actix_web::client::{Client, ClientResponse};
use actix_web::error::{ErrorBadRequest, ErrorInternalServerError};
use actix_web::http::header;
use actix_web::{web, Error, HttpRequest, HttpResponse};
use image::imageops::FilterType;
use image::GenericImageView;
use image::ImageFormat;
use crate::SiteConfig;
pub fn configure(cfg: &mut web::ServiceConfig) {
cfg.service(
web::resource("/media/photo/{width:\\d+}x{height:\\d+}/{filename}")
.route(web::get().to(serve_photo)),
);
cfg.service(
web::resource("/media/{type}/{filename:.+}")
.route(web::get().to(serve_file))
.route(web::head().to(serve_file)),
);
}
async fn serve_photo(
req: HttpRequest,
config: web::Data<SiteConfig>,
client: web::Data<Client>,
) -> Result<HttpResponse, Error> {
let width = req
.match_info()
.get("width")
.ok_or(ErrorBadRequest("Bad URI"))
.and_then(|v| v.parse().map_err(|_| ErrorBadRequest("Bad URI")))?;
let height = req
.match_info()
.get("height")
.ok_or(ErrorBadRequest("Bad URI"))
.and_then(|v| v.parse().map_err(|_| ErrorBadRequest("Bad URI")))?;
let filename = req
.match_info()
.get("filename")
.ok_or(ErrorBadRequest("Bad URI"))?;
let new_url = format!("{}/photo/{}", config.media_url(), filename);
let forwarded_req = client.request_from(new_url, req.head());
let forwarded_req = if let Some(addr) = req.head().peer_addr {
forwarded_req.header("x-forwarded-for", format!("{}", addr.ip()))
} else {
forwarded_req
};
let mut res = forwarded_req.send().await.map_err(Error::from)?;
// Check response code
if !res.status().is_success() {
return forward_response(res).await;
}
// Get the payload, at at least 20 MB of it...
let data = res.body().limit(20971520).await?;
// Determine the image format
let fmt = image::guess_format(data.as_ref()).map_err(|e| ErrorInternalServerError(e))?;
// Parse the image
let img = image::load_from_memory_with_format(data.as_ref(), fmt)
.map_err(|e| ErrorInternalServerError(e))?;
let (orig_width, orig_height) = img.dimensions();
let scaled = if width < orig_width && height < orig_height {
// Take the largest size that maintains the aspect ratio
let ratio = orig_width as f64 / orig_height as f64;
let (new_width, new_height) = if width > height {
(width, (width as f64 / ratio) as u32)
} else {
((height as f64 * ratio) as u32, height)
};
img.resize(new_width, new_height, FilterType::CatmullRom)
} else {
// We're not going to scale up images.
img
};
let mut new_data = Vec::new();
scaled
.write_to(&mut new_data, fmt) // ImageOutputFormat::Jpeg(128))
.map_err(|e| ErrorInternalServerError(e))?;
let mut client_resp = HttpResponse::build(res.status());
client_resp.set(header::CacheControl(vec![header::CacheDirective::MaxAge(
86400u32,
)]));
client_resp.set_header(header::CONTENT_TYPE, mime_for_image(fmt));
Ok(client_resp.body(new_data))
}
async fn serve_file(
req: HttpRequest,
config: web::Data<SiteConfig>,
client: web::Data<Client>,
) -> Result<HttpResponse, Error> {
let media_type = req
.match_info()
.get("type")
.ok_or(ErrorBadRequest("Bad URI"))?;
let filename = req
.match_info()
.get("filename")
.ok_or(ErrorBadRequest("Bad URI"))?;
let new_url = format!("{}/{}/{}", config.media_url(), media_type, filename);
let forwarded_req = client.request_from(new_url, req.head()).no_decompress();
let forwarded_req = if let Some(addr) = req.head().peer_addr {
forwarded_req.header("x-forwarded-for", format!("{}", addr.ip()))
} else {
forwarded_req
};
let res = forwarded_req.send().await.map_err(Error::from)?;
forward_response(res).await
}
async fn forward_response<S>(mut res: ClientResponse<S>) -> Result<HttpResponse, Error>
where
S: futures::Stream<Item = std::result::Result<bytes::Bytes, actix_web::error::PayloadError>>
+ std::marker::Unpin,
{
let mut client_resp = HttpResponse::build(res.status());
// Remove `Connection` as per
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection#Directives
for (header_name, header_value) in res.headers().iter().filter(|(h, _)| *h != "connection") {
client_resp.header(header_name.clone(), header_value.clone());
}
Ok(client_resp.body(res.body().limit(2147483648).await?))
}
fn mime_for_image(fmt: ImageFormat) -> &'static str {
match fmt {
ImageFormat::Png => "image/png",
ImageFormat::Jpeg => "image/jpeg",
ImageFormat::Gif => "image/gif",
ImageFormat::Tiff => "image/tiff",
ImageFormat::Ico => "image/vnd.microsoft.icon",
ImageFormat::WebP => "image/webp",
ImageFormat::Bmp => "image/bmp",
ImageFormat::Pnm => "image/x-portable-anymap",
ImageFormat::Tga => "image/x-tga",
ImageFormat::Dds => "image/vnd.ms-dds",
ImageFormat::Hdr => "image/vnd.radiance",
ImageFormat::Farbfeld => "image/farbfeld",
_ => "",
}
}
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