remove unwraps in multipart examples

inspired by #406

forms/multipart/Cargo.toml

@@ -12,5 +12,7 @@ readme = "README.md"
 [dependencies]
 actix-multipart = "0.3"
 actix-web = "3"
-futures = "0.3.1"
+
+futures-util = "0.3"
 sanitize-filename = "0.2"
+uuid = { version = "0.8", features = ["v4"] }

forms/multipart/src/main.rs

@@ -2,27 +2,33 @@ use std::io::Write;
 
 use actix_multipart::Multipart;
 use actix_web::{middleware, web, App, Error, HttpResponse, HttpServer};
-use futures::{StreamExt, TryStreamExt};
+use futures_util::TryStreamExt as _;
+use uuid::Uuid;
 
 async fn save_file(mut payload: Multipart) -> Result<HttpResponse, Error> {
     // iterate over multipart stream
-    while let Ok(Some(mut field)) = payload.try_next().await {
-        let content_type = field.content_disposition().unwrap();
-        let filename = content_type.get_filename().unwrap();
-        let filepath = format!("./tmp/{}", sanitize_filename::sanitize(&filename));
+    while let Some(mut field) = payload.try_next().await? {
+        // A multipart/form-data stream has to contain `content_disposition`
+        let content_disposition = field
+            .content_disposition()
+            .ok_or_else(|| HttpResponse::BadRequest().finish())?;
+
+        let filename = content_disposition.get_filename().map_or_else(
+            || Uuid::new_v4().to_string(),
+            |f| sanitize_filename::sanitize(f),
+        );
+        let filepath = format!("./tmp/{}", filename);
 
         // File::create is blocking operation, use threadpool
-        let mut f = web::block(|| std::fs::File::create(filepath))
-            .await
-            .unwrap();
+        let mut f = web::block(|| std::fs::File::create(filepath)).await?;
 
         // Field in turn is stream of *Bytes* object
-        while let Some(chunk) = field.next().await {
-            let data = chunk.unwrap();
+        while let Some(chunk) = field.try_next().await? {
             // filesystem operations are blocking, we have to use threadpool
-            f = web::block(move || f.write_all(&data).map(|_| f)).await?;
+            f = web::block(move || f.write_all(&chunk).map(|_| f)).await?;
         }
     }
+
     Ok(HttpResponse::Ok().into())
 }
 
@@ -37,17 +43,13 @@ fn index() -> HttpResponse {
         </body>
     </html>"#;
 
-    HttpResponse::Ok()
-        .content_type("text/html; charset=utf-8")
-        .body(html)
+    HttpResponse::Ok().body(html)
 }
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
-    std::env::set_var("RUST_LOG", "actix_server=info,actix_web=info");
-    std::fs::create_dir_all("./tmp").unwrap();
-
-    let ip = "0.0.0.0:3000";
+    std::env::set_var("RUST_LOG", "info");
+    std::fs::create_dir_all("./tmp")?;
 
     HttpServer::new(|| {
         App::new().wrap(middleware::Logger::default()).service(
@@ -56,7 +58,7 @@ async fn main() -> std::io::Result<()> {
                 .route(web::post().to(save_file)),
         )
     })
-    .bind(ip)?
+    .bind(("127.0.0.1", 8080))?
     .run()
     .await
 }