Update version

Cargo.toml

@@ -4,13 +4,13 @@ exclude = ["examples"]
 
 [workspace.package]
 edition = "2024"
-rust-version = "1.88"
+rust-version = "1.89"
 authors = ["Martin Berg Alstad"]
 homepage = "martials.no"
 
 [package]
 name = "lib"
-version = "2.0.0"
+version = "2.0.1"
 description = "A library with utilities and helper fuctions."
 edition = { workspace = true }
 rust-version = { workspace = true }
@@ -57,10 +57,10 @@ derive_more = { workspace = true, features = ["from", "constructor"] }
 
 [workspace.dependencies]
 # Async
-tokio = "1.40"
+tokio = "1.47"
 # Database
 diesel = "2.2"
-diesel-async = "0.5"
+diesel-async = "0.6"
 diesel_migrations = "2.2"
 deadpool-diesel = "0.6"
 # Error handling
@@ -71,13 +71,13 @@ quote = "1.0"
 deluxe = "0.5"
 proc-macro2 = "1.0"
 # Test
-testcontainers-modules = "0.11"
+testcontainers-modules = "0.13"
 # Utils
 derive_more = "2.0"
 regex = "1.11"
 
 [features]
-axum = ["dep:axum", "dep:tower", "dep:tower-http", "dep:thiserror", "dep:tracing", "dep:tracing-subscriber", "dep:tokio", "dep:mime"]
+axum = ["dep:axum", "dep:tower", "dep:serde", "dep:tower-http", "dep:thiserror", "dep:tracing", "dep:tracing-subscriber", "dep:tokio", "dep:mime"]
 diesel = ["dep:diesel-crud-trait", "dep:diesel", "dep:diesel-async", "dep:deadpool-diesel", "dep:diesel_migrations"]
 io = ["dep:tokio", "dep:tokio-util"]
 iter = []

examples/multipart_file/Cargo.lock

@@ -17,26 +17,15 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
-[[package]]
-name = "async-trait"
-version = "0.1.80"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6fa2087f2753a7da8cc1c0dbfcf89579dd57458e36769de5ac750b4671737ca"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "axum"
-version = "0.7.5"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a6c9af12842a67734c9a2e355436e5d03b22383ed60cf13cd0c18fbfe3dcbcf"
+checksum = "021e862c184ae977658b36c4500f7feac3221ca5da43e3f25bd04ab6c79a29b5"
 dependencies = [
- "async-trait",
  "axum-core",
  "bytes",
+ "form_urlencoded",
  "futures-util",
  "http",
  "http-body",
@@ -55,9 +44,9 @@ dependencies = [
  "serde_json",
  "serde_path_to_error",
  "serde_urlencoded",
- "sync_wrapper 1.0.1",
+ "sync_wrapper",
  "tokio",
- "tower 0.4.13",
+ "tower 0.5.2",
  "tower-layer",
  "tower-service",
  "tracing",
@@ -65,20 +54,19 @@ dependencies = [
 
 [[package]]
 name = "axum-core"
-version = "0.4.3"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15c63fd72d41492dc4f497196f5da1fb04fb7529e631d73630d1b491e47a2e3"
+checksum = "68464cd0412f486726fb3373129ef5d2993f90c34bc2bc1c1e9943b2f4fc7ca6"
 dependencies = [
- "async-trait",
  "bytes",
- "futures-util",
+ "futures-core",
  "http",
  "http-body",
  "http-body-util",
  "mime",
  "pin-project-lite",
  "rustversion",
- "sync_wrapper 0.1.2",
+ "sync_wrapper",
  "tower-layer",
  "tower-service",
  "tracing",
@@ -125,18 +113,18 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "derive_more"
-version = "1.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4a9b99b9cbbe49445b21764dc0625032a89b145a2642e67603e1c936f5458d05"
+checksum = "093242cf7570c207c83073cf82f79706fe7b8317e98620a47d5be7c3d8497678"
 dependencies = [
  "derive_more-impl",
 ]
 
 [[package]]
 name = "derive_more-impl"
-version = "1.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cb7330aeadfbe296029522e6c40f315320aba36fc43a5b3632f3795348f3bd22"
+checksum = "bda628edc44c4bb645fbe0f758797143e4e07926f7ebf4e9bdfbd3d2ce621df3"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -290,6 +278,19 @@ dependencies = [
  "hyper",
  "pin-project-lite",
  "tokio",
+ "tower 0.4.13",
+ "tower-service",
+]
+
+[[package]]
+name = "io-uring"
+version = "0.7.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "046fa2d4d00aea763528b4950358d0ead425372445dc8ff86312b3c69ff7727b"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "libc",
 ]
 
 [[package]]
@@ -306,15 +307,15 @@ checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
 [[package]]
 name = "lib"
-version = "1.4.3"
+version = "2.0.1"
 dependencies = [
- "async-trait",
  "axum",
  "derive_more",
  "mime",
+ "serde",
  "thiserror",
  "tokio",
- "tower 0.5.0",
+ "tower 0.5.2",
  "tower-http",
  "tracing",
  "tracing-subscriber",
@@ -322,9 +323,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.155"
+version = "0.2.175"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
+checksum = "6a82ae493e598baaea5209805c49bbf2ea7de956d50d7da0da1164f9c6d28543"
 
 [[package]]
 name = "log"
@@ -334,9 +335,9 @@ checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
 [[package]]
 name = "matchit"
-version = "0.7.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0e7465ac9959cc2b1404e8e2367b43684a6d13790fe23056cc8c6c5a6b7bcb94"
+checksum = "47e1ffaa40ddd1f3ed91f717a33c8c0ee23fff369e3aa8772b9605cc1d22f4c3"
 
 [[package]]
 name = "memchr"
@@ -368,7 +369,7 @@ dependencies = [
  "hermit-abi",
  "libc",
  "wasi",
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -468,9 +469,9 @@ checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.86"
+version = "1.0.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
+checksum = "89ae43fd86e4158d6db51ad8e2b80f313af9cc74f5c0e03ccb87de09998732de"
 dependencies = [
  "unicode-ident",
 ]
@@ -564,6 +565,12 @@ dependencies = [
  "lazy_static",
 ]
 
+[[package]]
+name = "slab"
+version = "0.4.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a2ae44ef20feb57a68b23d846850f861394c2e02dc425a50098ae8c90267589"
+
 [[package]]
 name = "smallvec"
 version = "1.13.2"
@@ -572,12 +579,12 @@ checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
 
 [[package]]
 name = "socket2"
-version = "0.5.7"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce305eb0b4296696835b71df73eb912e0f1ffd2556a501fcede6e0c50349191c"
+checksum = "233504af464074f9d066d7b5416c5f9b894a5862a6506e306f7b816cdd6f1807"
 dependencies = [
  "libc",
- "windows-sys",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -588,21 +595,15 @@ checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
 
 [[package]]
 name = "syn"
-version = "2.0.68"
+version = "2.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "901fa70d88b9d6c98022e23b4136f9f3e54e4662c3bc1bd1d84a42a9a0f0c1e9"
+checksum = "ede7c438028d4436d71104916910f5bb611972c5cfd7f89b8300a8186e6fada6"
 dependencies = [
  "proc-macro2",
  "quote",
  "unicode-ident",
 ]
 
-[[package]]
-name = "sync_wrapper"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2047c6ded9c721764247e62cd3b03c09ffc529b2ba5b10ec482ae507a4a70160"
-
 [[package]]
 name = "sync_wrapper"
 version = "1.0.1"
@@ -611,18 +612,18 @@ checksum = "a7065abeca94b6a8a577f9bd45aa0867a2238b74e8eb67cf10d492bc39351394"
 
 [[package]]
 name = "thiserror"
-version = "1.0.61"
+version = "2.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c546c80d6be4bc6a00c0f01730c08df82eaa7a7a61f11d656526506112cc1709"
+checksum = "3467d614147380f2e4e374161426ff399c91084acd2363eaf549172b3d5e60c0"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.61"
+version = "2.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46c3384250002a6d5af4d114f2845d37b57521033f30d5c3f46c4d70e1197533"
+checksum = "6c5e1be1c48b9172ee610da68fd9cd2770e7a4056cb3fc98710ee6906f0c7960"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -641,24 +642,26 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.40.0"
+version = "1.47.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2b070231665d27ad9ec9b8df639893f46727666c6767db40317fbe920a5d998"
+checksum = "89e49afdadebb872d3145a5638b59eb0691ea23e46ca484037cfab3b76b95038"
 dependencies = [
  "backtrace",
+ "io-uring",
  "libc",
  "mio",
  "pin-project-lite",
+ "slab",
  "socket2",
  "tokio-macros",
- "windows-sys",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
 name = "tokio-macros"
-version = "2.4.0"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "693d596312e88961bc67d7f1f97af8a70227d9f90c31bba5806eec004978d752"
+checksum = "6e06d43f1345a3bcd39f6a56dbb7dcab2ba47e68e8ac134855e7e2bdbaf8cab8"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -678,30 +681,34 @@ dependencies = [
  "tokio",
  "tower-layer",
  "tower-service",
- "tracing",
 ]
 
 [[package]]
 name = "tower"
-version = "0.5.0"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36b837f86b25d7c0d7988f00a54e74739be6477f2aac6201b8f429a7569991b7"
+checksum = "d039ad9159c98b70ecfd540b2573b97f7f52c3e8d9f8ad57a24b916a536975f9"
 dependencies = [
+ "futures-core",
+ "futures-util",
+ "pin-project-lite",
+ "sync_wrapper",
+ "tokio",
  "tower-layer",
  "tower-service",
+ "tracing",
 ]
 
 [[package]]
 name = "tower-http"
-version = "0.5.2"
+version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e9cd434a998747dd2c4276bc96ee2e0c7a2eadf3cae88e52be55a05fa9053f5"
+checksum = "adc82fd73de2a9722ac5da747f12383d2bfdb93591ee6c58486e0097890f05f2"
 dependencies = [
  "bitflags",
  "bytes",
  "http",
  "http-body",
- "http-body-util",
  "pin-project-lite",
  "tower-layer",
  "tower-service",
@@ -710,15 +717,15 @@ dependencies = [
 
 [[package]]
 name = "tower-layer"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c20c8dbed6283a09604c3e69b4b7eeb54e298b8a600d4d5ecb5ad39de609f1d0"
+checksum = "121c2a6cda46980bb0fcd1647ffaf6cd3fc79a013de288782836f6df9c48780e"
 
 [[package]]
 name = "tower-service"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6bc1c9ce2b5135ac7f93c72918fc37feb872bdc6a5533a8b85eb4b86bfdae52"
+checksum = "8df9b6e13f2d32c91b9bd719c00d1958837bc7dec474d94952798cc8e69eeec3"
 
 [[package]]
 name = "tracing"
@@ -834,10 +841,19 @@ dependencies = [
 ]
 
 [[package]]
-name = "windows-targets"
+name = "windows-sys"
-version = "0.52.5"
+version = "0.59.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -851,48 +867,48 @@ dependencies = [
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
 
 [[package]]
 name = "windows_i686_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"

examples/multipart_file/Cargo.toml

@@ -1,9 +1,9 @@
 [package]
 name = "multipart_file"
 version = "0.1.0"
-edition = "2021"
+edition = "2024"
 
 [dependencies]
 lib = { path = "../..", features = ["axum"] }
-axum = "0.7.5"
+axum = "0.8"
-tokio = { version = "1.40", features = ["rt-multi-thread", "macros"] }
+tokio = { version = "1.47", features = ["rt-multi-thread", "macros"] }

examples/multipart_file/src/main.rs

@@ -1,22 +1,10 @@
 use axum::extract::DefaultBodyLimit;
 use lib::axum::app::AppBuilder;
-use lib::axum::extractor::MultipartFiles;
+use lib::axum::extractor::{MultipartFile, MultipartFiles};
 use lib::routes;
 
-// 0 or more
+// 0 or more files
-async fn with_optional_file(files: Option<MultipartFiles>) -> String {
+async fn several_files(MultipartFiles(files): MultipartFiles) -> String {
-    format!(
-        "{:?}",
-        files.map(|files| files
-            .0
-            .into_iter()
-            .map(|file| file.filename)
-            .collect::<Vec<_>>())
-    )
-}
-
-// 1 or more files
-async fn handler(MultipartFiles(files): MultipartFiles) -> String {
     format!(
         "{:?} uploaded",
         files
@@ -26,11 +14,26 @@ async fn handler(MultipartFiles(files): MultipartFiles) -> String {
     )
 }
 
+// 1 file exactly
+async fn single_file(MultipartFile(file): MultipartFile) -> String {
+    format!("{:?} uploaded", file.filename)
+}
+
+// 0 or 1 file
+async fn optional_single_file(file: Option<MultipartFile>) -> String {
+    format!(
+        "{:?} uploaded",
+        file.map(|file| file.0.filename)
+            .unwrap_or(String::from("No file found"))
+    )
+}
+
 #[tokio::main]
 async fn main() {
     let route = routes!(
-        get "/" => handler,
+        get "/" => several_files,
-        get "/opt" => with_optional_file
+        get "/file" => single_file,
+        get "/opt/file" => optional_single_file
     )
     .layer(DefaultBodyLimit::disable());
     AppBuilder::new().route(route).serve().await.unwrap();

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1751211869,
+        "lastModified": 1757020766,
-        "narHash": "sha256-1Cu92i1KSPbhPCKxoiVG5qnoRiKTgR5CcGSRyLpOd7Y=",
+        "narHash": "sha256-PLoSjHRa2bUbi1x9HoXgTx2AiuzNXs54c8omhadyvp0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b43c397f6c213918d6cfe6e3550abfe79b5d1c51",
+        "rev": "fe83bbdde2ccdc2cb9573aa846abe8363f79a97a",
         "type": "github"
       },
       "original": {
@@ -18,11 +18,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1741173522,
+        "lastModified": 1756787288,
-        "narHash": "sha256-k7VSqvv0r1r53nUI/IfPHCppkUAddeXn843YlAC5DR0=",
+        "narHash": "sha256-rw/PHa1cqiePdBxhF66V7R+WAP8WekQ0mCDG4CFqT8Y=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d69ab0d71b22fa1ce3dbeff666e6deb4917db049",
+        "rev": "d0fc30899600b9b3466ddb260fd83deb486c32f1",
         "type": "github"
       },
       "original": {

flake.nix

@@ -29,7 +29,7 @@
           ] ++ [
             # Diesel
             diesel-cli
-            unstable.libpq
+            libpq
           ];
 
           shellHook = "fish";

src/axum/extractor.rs

@@ -1,10 +1,11 @@
-use axum::{
+use axum::extract::FromRequest;
-    extract::{
+use axum::extract::Multipart;
-        FromRequest, Multipart, Request,
+use axum::extract::OptionalFromRequest;
-        multipart::{Field, MultipartError, MultipartRejection},
+use axum::extract::Request;
-    },
+use axum::extract::multipart::Field;
-    response::IntoResponse,
+use axum::extract::multipart::MultipartError;
-};
+use axum::extract::multipart::MultipartRejection;
+use axum::response::IntoResponse;
 use mime::Mime;
 use std::str::FromStr;
 use thiserror::Error;
@@ -140,6 +141,40 @@ where
     }
 }
 
+impl<S> OptionalFromRequest<S> for MultipartFile
+where
+    S: Send + Sync,
+{
+    type Rejection = MultipartFileRejection;
+
+    /// Extracts a single file from a multipart request.
+    /// Expects exactly one file. A file must have a name, bytes and optionally a content type.
+    /// This extractor consumes the request and must ble placed last in the handler.
+    /// # Example
+    /// ```
+    /// use std::io::Read;
+    /// use axum::response::Html;
+    /// use lib::axum::extractor::{MultipartFile, MultipartFiles};
+    ///
+    /// async fn upload_file(opt_file: Option<MultipartFile>) -> Html<String> {
+    ///     Html(opt_file
+    ///         .map(|MultipartFile(file)| String::from_utf8(file.bytes).unwrap())
+    ///         .unwrap_or_else(|| String::from("<p>Not Found</p>"))
+    ///     )
+    /// }
+    /// ```
+    async fn from_request(req: Request, state: &S) -> Result<Option<Self>, Self::Rejection> {
+        let multipart = Multipart::from_request(req, state).await?;
+        let files = get_files(multipart).await?;
+        if files.len() > 1 {
+            Err(MultipartFileRejection::SeveralFiles)
+        } else {
+            let file = files.first().ok_or(MultipartFileRejection::NoFiles)?;
+            Ok(Some(MultipartFile(file.clone())))
+        }
+    }
+}
+
 impl<S> FromRequest<S> for MultipartFiles
 where
     S: Send + Sync,
@@ -147,7 +182,7 @@ where
     type Rejection = MultipartFileRejection;
 
     /// Extracts multiple files from a multipart request.
-    /// Expects at least one file. A file must have a name, bytes and optionally a content type.
+    /// Can contain 0 files. A file must have a name, bytes and optionally a content type.
     /// This extractor consumes the request and must ble placed last in the handler.
     /// # Example
     /// ```
@@ -167,13 +202,9 @@ where
     async fn from_request(req: Request, state: &S) -> Result<Self, Self::Rejection> {
         let multipart = Multipart::from_request(req, state).await?;
         let files = get_files(multipart).await?;
-        if files.is_empty() {
-            Err(MultipartFileRejection::NoFiles)
-        } else {
         Ok(MultipartFiles(files))
     }
 }
-}
 
 async fn get_files(mut multipart: Multipart) -> Result<Vec<File>, MultipartFileRejection> {
     let mut files = vec![];