use actix_form_data::{Field, Form, Value}; use actix_web::{ guard, http::header::{CacheControl, CacheDirective}, middleware::Logger, web, App, HttpResponse, HttpServer, }; use futures::stream::{Stream, TryStreamExt}; use log::{error, info}; 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; // 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?; } // 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()); } } else { return Ok(()); } // Open the file for writing let file = actix_fs::file::create(path.clone()).await?; // 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()); } 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, } } /// Handle responding to succesful uploads async fn upload(value: Value) -> Result { 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 }))) } /// Serve original files async fn serve( manager: web::Data, filename: web::Path, ) -> Result { let mut path = manager.image_dir(); path.push(filename.into_inner()); 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)) } /// Serve resized files async fn serve_resized( manager: web::Data, filename: web::Path<(u32, String)>, ) -> Result { use image::GenericImageView; let mut path = manager.image_dir(); let (size, name) = filename.into_inner(); path.push(size.to_string()); path.push(name.clone()); let ext = path .extension() .ok_or(UploadError::MissingExtension)? .to_owned(); let ext = from_ext(ext); // 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()); } let mut original_path = manager.image_dir(); original_path.push(name.clone()); // 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)?; let img = web::block(move || image::load_from_memory(&bytes)).await?; (img, format) }; // 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)); } // 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(); // Save the file in another task, we want to return the thumbnail now actix_rt::spawn(async move { 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)) } // A helper method to produce responses with proper cache headers fn srv_response(stream: S, ext: mime::Mime) -> HttpResponse where S: Stream> + Unpin + 'static, E: Into, { 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?; // 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(()) }