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pict-rs/src/main.rs

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use actix_form_data::{Field, Form, Value};
use actix_web::{
guard,
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http::header::{CacheControl, CacheDirective},
middleware::Logger,
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web, App, HttpResponse, HttpServer,
};
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use futures::stream::{Stream, TryStreamExt};
use log::{error, info};
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use std::path::PathBuf;
mod error;
mod upload_manager;
use self::{error::UploadError, upload_manager::UploadManager};
const ACCEPTED_MIMES: &[mime::Mime] = &[
mime::IMAGE_BMP,
mime::IMAGE_GIF,
mime::IMAGE_JPEG,
mime::IMAGE_PNG,
];
const MEGABYTES: usize = 1024 * 1024;
const HOURS: u32 = 60 * 60;
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// Try writing to a file
async fn safe_save_file(path: PathBuf, bytes: bytes::Bytes) -> Result<(), UploadError> {
if let Some(path) = path.parent() {
// create the directory for the file
actix_fs::create_dir_all(path.to_owned()).await?;
}
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// Only write the file if it doesn't already exist
if let Err(e) = actix_fs::metadata(path.clone()).await {
if e.kind() != Some(std::io::ErrorKind::NotFound) {
return Err(e.into());
}
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} else {
return Ok(());
}
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// Open the file for writing
let file = actix_fs::file::create(path.clone()).await?;
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// try writing
if let Err(e) = actix_fs::file::write(file, bytes).await {
error!("Error writing file, {}", e);
// remove file if writing failed before completion
actix_fs::remove_file(path).await?;
return Err(e.into());
}
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Ok(())
}
fn to_ext(mime: mime::Mime) -> &'static str {
if mime == mime::IMAGE_PNG {
".png"
} else if mime == mime::IMAGE_JPEG {
".jpg"
} else if mime == mime::IMAGE_GIF {
".gif"
} else {
".bmp"
}
}
fn from_ext(ext: std::ffi::OsString) -> mime::Mime {
match ext.to_str() {
Some("png") => mime::IMAGE_PNG,
Some("jpg") => mime::IMAGE_JPEG,
Some("gif") => mime::IMAGE_GIF,
_ => mime::IMAGE_BMP,
}
}
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/// Handle responding to succesful uploads
async fn upload(value: Value) -> Result<HttpResponse, UploadError> {
let images = value
.map()
.and_then(|mut m| m.remove("images"))
.and_then(|images| images.array())
.ok_or(UploadError::NoFiles)?;
let mut files = Vec::new();
for image in images.into_iter().filter_map(|i| i.file()) {
if let Some(saved_as) = image
.saved_as
.as_ref()
.and_then(|s| s.file_name())
.and_then(|s| s.to_str())
{
info!("Uploaded {} as {:?}", image.filename, saved_as);
files.push(serde_json::json!({ "file": saved_as }));
}
}
Ok(HttpResponse::Created().json(serde_json::json!({ "msg": "ok", "files": files })))
}
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/// Serve original files
async fn serve(
manager: web::Data<UploadManager>,
filename: web::Path<String>,
) -> Result<HttpResponse, UploadError> {
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let mut path = manager.image_dir();
path.push(filename.into_inner());
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let ext = path
.extension()
.ok_or(UploadError::MissingExtension)?
.to_owned();
let ext = from_ext(ext);
let stream = actix_fs::read_to_stream(path).await?;
Ok(srv_response(stream, ext))
}
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/// Serve resized files
async fn serve_resized(
manager: web::Data<UploadManager>,
filename: web::Path<(u32, String)>,
) -> Result<HttpResponse, UploadError> {
use image::GenericImageView;
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let mut path = manager.image_dir();
let (size, name) = filename.into_inner();
path.push(size.to_string());
path.push(name.clone());
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let ext = path
.extension()
.ok_or(UploadError::MissingExtension)?
.to_owned();
let ext = from_ext(ext);
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// If the thumbnail doesn't exist, we need to create it
if let Err(e) = actix_fs::metadata(path.clone()).await {
if e.kind() != Some(std::io::ErrorKind::NotFound) {
error!("Error looking up thumbnail, {}", e);
return Err(e.into());
}
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let mut original_path = manager.image_dir();
original_path.push(name.clone());
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// Read the image file & produce a DynamicImage
//
// Drop bytes so we don't keep it around in memory longer than we need to
let (img, format) = {
let bytes = actix_fs::read(original_path.clone()).await?;
let format = image::guess_format(&bytes)?;
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let img = web::block(move || image::load_from_memory(&bytes)).await?;
(img, format)
};
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// return original image if resize target is larger
if !img.in_bounds(size, size) {
drop(img);
let stream = actix_fs::read_to_stream(original_path).await?;
return Ok(srv_response(stream, ext));
}
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// perform thumbnail operation in a blocking thread
let img_bytes: bytes::Bytes = web::block(move || {
let mut bytes = std::io::Cursor::new(vec![]);
img.thumbnail(size, size).write_to(&mut bytes, format)?;
Ok(bytes::Bytes::from(bytes.into_inner())) as Result<_, image::error::ImageError>
})
.await?;
let path2 = path.clone();
let img_bytes2 = img_bytes.clone();
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// Save the file in another task, we want to return the thumbnail now
actix_rt::spawn(async move {
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if let Err(e) = safe_save_file(path2, img_bytes2).await {
error!("Error saving file, {}", e);
}
});
return Ok(srv_response(
Box::pin(futures::stream::once(async {
Ok(img_bytes) as Result<_, UploadError>
})),
ext,
));
}
let stream = actix_fs::read_to_stream(path).await?;
Ok(srv_response(stream, ext))
}
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// A helper method to produce responses with proper cache headers
fn srv_response<S, E>(stream: S, ext: mime::Mime) -> HttpResponse
where
S: Stream<Item = Result<bytes::Bytes, E>> + Unpin + 'static,
E: Into<UploadError>,
{
HttpResponse::Ok()
.set(CacheControl(vec![
CacheDirective::Public,
CacheDirective::MaxAge(24 * HOURS),
CacheDirective::Extension("immutable".to_owned(), None),
]))
.content_type(ext.to_string())
.streaming(stream.err_into())
}
#[actix_rt::main]
async fn main() -> Result<(), anyhow::Error> {
env_logger::init();
let manager = UploadManager::new("data/".to_string().into()).await?;
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// Create a new Multipart Form validator
//
// This form is expecting a single array field, 'images' with at most 10 files in it
let manager2 = manager.clone();
let form = Form::new()
.max_files(10)
.max_file_size(40 * MEGABYTES)
.field(
"images",
Field::array(Field::file(move |filename, content_type, stream| {
let manager = manager2.clone();
async move { manager.upload(filename, content_type, stream).await }
})),
);
HttpServer::new(move || {
App::new()
.wrap(Logger::default())
.data(manager.clone())
.service(
web::scope("/image")
.service(
web::resource("")
.guard(guard::Post())
.wrap(form.clone())
.route(web::post().to(upload)),
)
.service(web::resource("/{filename}").route(web::get().to(serve)))
.service(
web::resource("/{size}/{filename}").route(web::get().to(serve_resized)),
),
)
})
.bind("127.0.0.1:8080")?
.run()
.await?;
Ok(())
}