add environment variable configuration

README.md

@@ -19,13 +19,14 @@ To get set up:
 
 ## running & config
 
-At runtime the environment variable `DATABASE_URL` must be set (e.g. `postgres://localhost`).
-A folder named `files` needs to be created next to the application.
+| environment variable | default value         |
+| -------------------- | --------------------- |
+| DATABASE_URL         | postresql://localhost |
+| SERVER_URL           | http://loalhost:8000  |
+| FILES_DIR            | ./files               |
+| UPLOAD_MAX_BYTES     | 8388608 (8MiB)        |
+| BIND_ADDRESS         | 0.0.0.0:8000          |
 
 Other things are not configurable yet.
 
-- The application listens on port 8000
-- The server url is `http://localhost:8000/`
-- The upload limit is 8MiB
 - The maximum filename length is 255
-- The uploaded files are stored in the `files` directory

src/deleter.rs

@@ -3,7 +3,7 @@ use chrono::{prelude::*, Duration};
 use futures::future::FutureExt;
 use sqlx::postgres::PgPool;
 
-pub(crate) async fn delete_old_files(receiver: Receiver<()>, db: PgPool) {
+pub(crate) async fn delete_old_files(receiver: Receiver<()>, db: PgPool, files_dir: PathBuf) {
     loop {
         wait_for_file_expiry(&receiver, &db).await;
         let now = Local::now().naive_local();
@@ -13,7 +13,8 @@ pub(crate) async fn delete_old_files(receiver: Receiver<()>, db: PgPool) {
                 .await
                 .unwrap();
         for expired_file in expired_files {
-            let path = PathBuf::from(&format!("files/{}", expired_file.file_id));
+            let mut path = files_dir.clone();
+            path.push(&expired_file.file_id);
             if path.exists().await {
                 log::info!("delete file {}", expired_file.file_id);
                 fs::remove_file(&path).await.expect("could not delete file");

src/main.rs

@@ -30,9 +30,11 @@ async fn upload(
     payload: Multipart,
     db: web::Data<PgPool>,
     sender: web::Data<Sender<()>>,
+    config: web::Data<Config>,
 ) -> Result<HttpResponse, Error> {
     let file_id = format!("{:x?}", rand::random::<u32>());
-    let filename = PathBuf::from(format!("files/{}", file_id));
+    let mut filename = config.files_dir.clone();
+    filename.push(&file_id);
 
     let (original_name, valid_till, kind) =
         match multipart::parse_multipart(payload, &file_id, &filename).await {
@@ -72,8 +74,10 @@ async fn upload(
         .finish())
 }
 
-async fn uploaded(id: web::Path<String>) -> Result<HttpResponse, Error> {
-    let upload_html = UPLOAD_HTML.replace("{id}", id.as_ref());
+async fn uploaded(id: web::Path<String>, config: web::Data<Config>) -> Result<HttpResponse, Error> {
+    let upload_html = UPLOAD_HTML
+        .replace("{id}", id.as_ref())
+        .replace("{server}", &config.server_url);
     Ok(HttpResponse::Ok()
         .content_type("text/html")
         .body(upload_html))
@@ -83,6 +87,7 @@ async fn download(
     req: HttpRequest,
     id: web::Path<String>,
     db: web::Data<PgPool>,
+    config: web::Data<Config>,
 ) -> Result<HttpResponse, Error> {
     let row = sqlx::query!(
         "SELECT file_id, file_name, kind from files WHERE file_id = $1",
@@ -91,7 +96,8 @@ async fn download(
     .fetch_one(db.as_ref())
     .await
     .map_err(|_| error::ErrorNotFound("could not find file"))?;
-    let path: PathBuf = PathBuf::from(format!("files/{}", row.file_id));
+    let mut path = config.files_dir.clone();
+    path.push(&row.file_id);
 
     if row.kind == FileKind::TEXT.to_string() {
         let content = fs::read_to_string(path).await?;
@@ -110,7 +116,7 @@ async fn download(
 async fn setup_db() -> PgPool {
     let pool = PgPool::builder()
         .max_size(5)
-        .build(&env::var("DATABASE_URL").expect("DATABASE_URL environement variable not set"))
+        .build(&env::var("DATABASE_URL").unwrap_or_else(|_| "postgresql://localhost".to_owned()))
         .await
         .expect("could not create db pool");
 
@@ -122,6 +128,12 @@ async fn setup_db() -> PgPool {
     pool
 }
 
+#[derive(Clone)]
+struct Config {
+    server_url: String,
+    files_dir: PathBuf,
+}
+
 #[actix_rt::main]
 async fn main() -> std::io::Result<()> {
     std::env::set_var("RUST_LOG", "warn,datatrash=info,actix_web=info");
@@ -131,25 +143,42 @@ async fn main() -> std::io::Result<()> {
 
     log::info!("omnomnom");
 
+    let config = Config {
+        server_url: env::var("SERVER_URL").unwrap_or_else(|_| "http://localhost:8000".to_owned()),
+        files_dir: PathBuf::from(env::var("FILES_DIR").unwrap_or_else(|_| "./files".to_owned())),
+    };
+
     let (send, recv) = async_std::sync::channel::<()>(1);
-    task::spawn(deleter::delete_old_files(recv, pool.clone()));
+    task::spawn(deleter::delete_old_files(
+        recv,
+        pool.clone(),
+        config.files_dir.clone(),
+    ));
 
     let db = web::Data::new(pool);
     let send = web::Data::new(send);
+    let max_bytes: usize = env::var("UPLOAD_MAX_BYTES")
+        .ok()
+        .and_then(|variable| variable.parse().ok())
+        .unwrap_or(8_388_608);
+    let bind_address = env::var("BIND_ADDRESS").unwrap_or_else(|_| "0.0.0.0:8000".to_owned());
 
-    HttpServer::new(move || {
+    HttpServer::new({
+        move || {
             App::new()
                 .wrap(middleware::Logger::default())
                 .app_data(db.clone())
                 .app_data(send.clone())
-            .app_data(Bytes::configure(|cfg| cfg.limit(8_388_608)))
+                .app_data(Bytes::configure(|cfg| cfg.limit(max_bytes)))
+                .data(config.clone())
                 .service(web::resource("/").route(web::get().to(index)))
                 .service(web::resource("/upload").route(web::post().to(upload)))
                 .service(web::resource("/upload/{id}").route(web::get().to(uploaded)))
                 .service(web::resource("/file/{id}").route(web::get().to(download)))
                 .service(Files::new("/static", "static").disable_content_disposition())
+        }
     })
-    .bind("0.0.0.0:8000")?
+    .bind(bind_address)?
     .run()
     .await
 }

template/upload.html

@@ -10,7 +10,7 @@
       <h1><a href="/">datatrash</a></h1>
       <p>
         Uploaded
-        <a href="http://localhost:8000/file/{id}">
+        <a href="{server}/file/{id}">
           http://localhost:8000/files/{id}
         </a>
       </p>