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Protobuf payload extractor for Actix Web. </span><span class="attr">#![forbid(unsafe_code)] #![deny(rust_2018_idioms, nonstandard_style)] #![warn(future_incompatible)] #![doc(html_logo_url = <span class="string">"https://actix.rs/img/logo.png"</span>)] #![doc(html_favicon_url = <span class="string">"https://actix.rs/favicon.ico"</span>)] #![cfg_attr(docsrs, feature(doc_auto_cfg))] </span><span class="kw">use </span>std::{ fmt, future::Future, ops::{Deref, DerefMut}, pin::Pin, task::{<span class="self">self</span>, Poll}, }; <span class="kw">use </span>actix_web::{ body::BoxBody, dev::Payload, error::PayloadError, http::header::{CONTENT_LENGTH, CONTENT_TYPE}, web::BytesMut, Error, FromRequest, HttpMessage, HttpRequest, HttpResponse, HttpResponseBuilder, Responder, ResponseError, }; <span class="kw">use </span>derive_more::Display; <span class="kw">use </span>futures_util::{ future::{FutureExt <span class="kw">as _</span>, LocalBoxFuture}, stream::StreamExt <span class="kw">as _</span>, }; <span class="kw">use </span>prost::{DecodeError <span class="kw">as </span>ProtoBufDecodeError, EncodeError <span class="kw">as </span>ProtoBufEncodeError, Message}; <span class="attr">#[derive(Debug, Display)] </span><span class="kw">pub enum </span>ProtoBufPayloadError { <span class="doccomment">/// Payload size is bigger than 256k </span><span class="attr">#[display(fmt = <span class="string">"Payload size is bigger than 256k"</span>)] </span>Overflow, <span class="doccomment">/// Content type error </span><span class="attr">#[display(fmt = <span class="string">"Content type error"</span>)] </span>ContentType, <span class="doccomment">/// Serialize error </span><span class="attr">#[display(fmt = <span class="string">"ProtoBuf serialize error: {_0}"</span>)] </span>Serialize(ProtoBufEncodeError), <span class="doccomment">/// Deserialize error </span><span class="attr">#[display(fmt = <span class="string">"ProtoBuf deserialize error: {_0}"</span>)] </span>Deserialize(ProtoBufDecodeError), <span class="doccomment">/// Payload error </span><span class="attr">#[display(fmt = <span class="string">"Error that occur during reading payload: {_0}"</span>)] </span>Payload(PayloadError), } <span class="kw">impl </span>ResponseError <span class="kw">for </span>ProtoBufPayloadError { <span class="kw">fn </span>error_response(<span class="kw-2">&</span><span class="self">self</span>) -> HttpResponse { <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ ProtoBufPayloadError::Overflow => HttpResponse::PayloadTooLarge().into(), <span class="kw">_ </span>=> HttpResponse::BadRequest().into(), } } } <span class="kw">impl </span>From<PayloadError> <span class="kw">for </span>ProtoBufPayloadError { <span class="kw">fn </span>from(err: PayloadError) -> ProtoBufPayloadError { ProtoBufPayloadError::Payload(err) } } <span class="kw">impl </span>From<ProtoBufDecodeError> <span class="kw">for </span>ProtoBufPayloadError { <span class="kw">fn </span>from(err: ProtoBufDecodeError) -> ProtoBufPayloadError { ProtoBufPayloadError::Deserialize(err) } } <span class="kw">pub struct </span>ProtoBuf<T: Message>(<span class="kw">pub </span>T); <span class="kw">impl</span><T: Message> Deref <span class="kw">for </span>ProtoBuf<T> { <span class="kw">type </span>Target = T; <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 </span>} } <span class="kw">impl</span><T: Message> DerefMut <span class="kw">for </span>ProtoBuf<T> { <span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { <span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">0 </span>} } <span class="kw">impl</span><T: Message> fmt::Debug <span class="kw">for </span>ProtoBuf<T> <span class="kw">where </span>T: fmt::Debug, { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { <span class="macro">write!</span>(f, <span class="string">"ProtoBuf: {:?}"</span>, <span class="self">self</span>.<span class="number">0</span>) } } <span class="kw">impl</span><T: Message> fmt::Display <span class="kw">for </span>ProtoBuf<T> <span class="kw">where </span>T: fmt::Display, { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { fmt::Display::fmt(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>, f) } } <span class="kw">pub struct </span>ProtoBufConfig { limit: usize, } <span class="kw">impl </span>ProtoBufConfig { <span class="doccomment">/// Change max size of payload. By default max size is 256Kb </span><span class="kw">pub fn </span>limit(<span class="kw-2">&mut </span><span class="self">self</span>, limit: usize) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ <span class="self">self</span>.limit = limit; <span class="self">self </span>} } <span class="kw">impl </span>Default <span class="kw">for </span>ProtoBufConfig { <span class="kw">fn </span>default() -> <span class="self">Self </span>{ ProtoBufConfig { limit: <span class="number">262_144 </span>} } } <span class="kw">impl</span><T> FromRequest <span class="kw">for </span>ProtoBuf<T> <span class="kw">where </span>T: Message + Default + <span class="lifetime">'static</span>, { <span class="kw">type </span>Error = Error; <span class="kw">type </span>Future = LocalBoxFuture<<span class="lifetime">'static</span>, <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error>>; <span class="attr">#[inline] </span><span class="kw">fn </span>from_request(req: <span class="kw-2">&</span>HttpRequest, payload: <span class="kw-2">&mut </span>Payload) -> <span class="self">Self</span>::Future { <span class="kw">let </span>limit = req .app_data::<ProtoBufConfig>() .map(|c| c.limit) .unwrap_or(<span class="number">262_144</span>); ProtoBufMessage::new(req, payload) .limit(limit) .map(<span class="kw">move </span>|res| <span class="kw">match </span>res { <span class="prelude-val">Err</span>(e) => <span class="prelude-val">Err</span>(e.into()), <span class="prelude-val">Ok</span>(item) => <span class="prelude-val">Ok</span>(ProtoBuf(item)), }) .boxed_local() } } <span class="kw">impl</span><T: Message + Default> Responder <span class="kw">for </span>ProtoBuf<T> { <span class="kw">type </span>Body = BoxBody; <span class="kw">fn </span>respond_to(<span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span>HttpRequest) -> HttpResponse { <span class="kw">let </span><span class="kw-2">mut </span>buf = Vec::new(); <span class="kw">match </span><span class="self">self</span>.<span class="number">0</span>.encode(<span class="kw-2">&mut </span>buf) { <span class="prelude-val">Ok</span>(()) => HttpResponse::Ok() .content_type(<span class="string">"application/protobuf"</span>) .body(buf), <span class="prelude-val">Err</span>(err) => HttpResponse::from_error(Error::from(ProtoBufPayloadError::Serialize(err))), } } } <span class="kw">pub struct </span>ProtoBufMessage<T: Message + Default> { limit: usize, length: <span class="prelude-ty">Option</span><usize>, stream: <span class="prelude-ty">Option</span><Payload>, err: <span class="prelude-ty">Option</span><ProtoBufPayloadError>, fut: <span class="prelude-ty">Option</span><LocalBoxFuture<<span class="lifetime">'static</span>, <span class="prelude-ty">Result</span><T, ProtoBufPayloadError>>>, } <span class="kw">impl</span><T: Message + Default> ProtoBufMessage<T> { <span class="doccomment">/// Create `ProtoBufMessage` for request. </span><span class="kw">pub fn </span>new(req: <span class="kw-2">&</span>HttpRequest, payload: <span class="kw-2">&mut </span>Payload) -> <span class="self">Self </span>{ <span class="kw">if </span>req.content_type() != <span class="string">"application/protobuf" </span>&& req.content_type() != <span class="string">"application/x-protobuf" </span>{ <span class="kw">return </span>ProtoBufMessage { limit: <span class="number">262_144</span>, length: <span class="prelude-val">None</span>, stream: <span class="prelude-val">None</span>, fut: <span class="prelude-val">None</span>, err: <span class="prelude-val">Some</span>(ProtoBufPayloadError::ContentType), }; } <span class="kw">let </span><span class="kw-2">mut </span>len = <span class="prelude-val">None</span>; <span class="kw">if let </span><span class="prelude-val">Some</span>(l) = req.headers().get(CONTENT_LENGTH) { <span class="kw">if let </span><span class="prelude-val">Ok</span>(s) = l.to_str() { <span class="kw">if let </span><span class="prelude-val">Ok</span>(l) = s.parse::<usize>() { len = <span class="prelude-val">Some</span>(l) } } } ProtoBufMessage { limit: <span class="number">262_144</span>, length: len, stream: <span class="prelude-val">Some</span>(payload.take()), fut: <span class="prelude-val">None</span>, err: <span class="prelude-val">None</span>, } } <span class="doccomment">/// Change max size of payload. By default max size is 256Kb </span><span class="kw">pub fn </span>limit(<span class="kw-2">mut </span><span class="self">self</span>, limit: usize) -> <span class="self">Self </span>{ <span class="self">self</span>.limit = limit; <span class="self">self </span>} } <span class="kw">impl</span><T: Message + Default + <span class="lifetime">'static</span>> Future <span class="kw">for </span>ProtoBufMessage<T> { <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><T, ProtoBufPayloadError>; <span class="kw">fn </span>poll(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, task: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>) -> Poll<<span class="self">Self</span>::Output> { <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>fut) = <span class="self">self</span>.fut { <span class="kw">return </span>Pin::new(fut).poll(task); } <span class="kw">if let </span><span class="prelude-val">Some</span>(err) = <span class="self">self</span>.err.take() { <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(err)); } <span class="kw">let </span>limit = <span class="self">self</span>.limit; <span class="kw">if let </span><span class="prelude-val">Some</span>(len) = <span class="self">self</span>.length.take() { <span class="kw">if </span>len > limit { <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(ProtoBufPayloadError::Overflow)); } } <span class="kw">let </span><span class="kw-2">mut </span>stream = <span class="self">self </span>.stream .take() .expect(<span class="string">"ProtoBufMessage could not be used second time"</span>); <span class="self">self</span>.fut = <span class="prelude-val">Some</span>( <span class="kw">async move </span>{ <span class="kw">let </span><span class="kw-2">mut </span>body = BytesMut::with_capacity(<span class="number">8192</span>); <span class="kw">while let </span><span class="prelude-val">Some</span>(item) = stream.next().<span class="kw">await </span>{ <span class="kw">let </span>chunk = item<span class="question-mark">?</span>; <span class="kw">if </span>(body.len() + chunk.len()) > limit { <span class="kw">return </span><span class="prelude-val">Err</span>(ProtoBufPayloadError::Overflow); } <span class="kw">else </span>{ body.extend_from_slice(<span class="kw-2">&</span>chunk); } } <span class="prelude-val">Ok</span>(<T>::decode(<span class="kw-2">&mut </span>body)<span class="question-mark">?</span>) } .boxed_local(), ); <span class="self">self</span>.poll(task) } } <span class="kw">pub trait </span>ProtoBufResponseBuilder { <span class="kw">fn </span>protobuf<T: Message>(<span class="kw-2">&mut </span><span class="self">self</span>, value: T) -> <span class="prelude-ty">Result</span><HttpResponse, Error>; } <span class="kw">impl </span>ProtoBufResponseBuilder <span class="kw">for </span>HttpResponseBuilder { <span class="kw">fn </span>protobuf<T: Message>(<span class="kw-2">&mut </span><span class="self">self</span>, value: T) -> <span class="prelude-ty">Result</span><HttpResponse, Error> { <span class="self">self</span>.insert_header((CONTENT_TYPE, <span class="string">"application/protobuf"</span>)); <span class="kw">let </span><span class="kw-2">mut </span>body = Vec::new(); value .encode(<span class="kw-2">&mut </span>body) .map_err(ProtoBufPayloadError::Serialize)<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(<span class="self">self</span>.body(body)) } } <span class="attr">#[cfg(test)] </span><span class="kw">mod </span>tests { <span class="kw">use </span>actix_web::{http::header, test::TestRequest}; <span class="kw">use super</span>::<span class="kw-2">*</span>; <span class="kw">impl </span>PartialEq <span class="kw">for </span>ProtoBufPayloadError { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>ProtoBufPayloadError) -> bool { <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ ProtoBufPayloadError::Overflow => { <span class="macro">matches!</span>(<span class="kw-2">*</span>other, ProtoBufPayloadError::Overflow) } ProtoBufPayloadError::ContentType => { <span class="macro">matches!</span>(<span class="kw-2">*</span>other, ProtoBufPayloadError::ContentType) } <span class="kw">_ </span>=> <span class="bool-val">false</span>, } } } <span class="attr">#[derive(Clone, PartialEq, Eq, Message)] </span><span class="kw">pub struct </span>MyObject { <span class="attr">#[prost(int32, tag = <span class="string">"1"</span>)] </span><span class="kw">pub </span>number: i32, <span class="attr">#[prost(string, tag = <span class="string">"2"</span>)] </span><span class="kw">pub </span>name: String, } <span class="attr">#[actix_web::test] </span><span class="kw">async fn </span>test_protobuf() { <span class="kw">let </span>protobuf = ProtoBuf(MyObject { number: <span class="number">9</span>, name: <span class="string">"test"</span>.to_owned(), }); <span class="kw">let </span>req = TestRequest::default().to_http_request(); <span class="kw">let </span>resp = protobuf.respond_to(<span class="kw-2">&</span>req); <span class="kw">let </span>ct = resp.headers().get(header::CONTENT_TYPE).unwrap(); <span class="macro">assert_eq!</span>(ct, <span class="string">"application/protobuf"</span>); } <span class="attr">#[actix_web::test] </span><span class="kw">async fn </span>test_protobuf_message() { <span class="kw">let </span>(req, <span class="kw-2">mut </span>pl) = TestRequest::default().to_http_parts(); <span class="kw">let </span>protobuf = ProtoBufMessage::<MyObject>::new(<span class="kw-2">&</span>req, <span class="kw-2">&mut </span>pl).<span class="kw">await</span>; <span class="macro">assert_eq!</span>(protobuf.err().unwrap(), ProtoBufPayloadError::ContentType); <span class="kw">let </span>(req, <span class="kw-2">mut </span>pl) = TestRequest::get() .insert_header((header::CONTENT_TYPE, <span class="string">"application/text"</span>)) .to_http_parts(); <span class="kw">let </span>protobuf = ProtoBufMessage::<MyObject>::new(<span class="kw-2">&</span>req, <span class="kw-2">&mut </span>pl).<span class="kw">await</span>; <span class="macro">assert_eq!</span>(protobuf.err().unwrap(), ProtoBufPayloadError::ContentType); <span class="kw">let </span>(req, <span class="kw-2">mut </span>pl) = TestRequest::get() .insert_header((header::CONTENT_TYPE, <span class="string">"application/protobuf"</span>)) .insert_header((header::CONTENT_LENGTH, <span class="string">"10000"</span>)) .to_http_parts(); <span class="kw">let </span>protobuf = ProtoBufMessage::<MyObject>::new(<span class="kw-2">&</span>req, <span class="kw-2">&mut </span>pl) .limit(<span class="number">100</span>) .<span class="kw">await</span>; <span class="macro">assert_eq!</span>(protobuf.err().unwrap(), ProtoBufPayloadError::Overflow); } } </code></pre></div></section></main></body></html>