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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `actix-cors/src/middleware.rs`."><title>middleware.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-fa3bb1812debf86c.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="actix_cors" data-themes="" data-resource-suffix="" data-rustdoc-version="1.75.0-nightly (2bbb61989 2023-10-04)" data-channel="nightly" data-search-js="search-8be46b629f5f14a8.js" data-settings-js="settings-74424d7eec62a23e.js" ><script src="../../static.files/storage-fec3eaa3851e447d.js"></script><script defer src="../../static.files/src-script-3280b574d94e47b4.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-c5bd66d33317d69f.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-5d8b3c7633ad77ba.css"></noscript><link rel="icon" href="https://actix.rs/favicon.ico"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><nav class="sub"><a class="sub-logo-container" href="../../actix_cors/index.html"><img src="https://actix.rs/img/logo.png" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{collections::HashSet, rc::Rc};
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<span class="kw">use </span>actix_utils::future::ok;
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<span class="kw">use </span>actix_web::{
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body::{EitherBody, MessageBody},
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dev::{forward_ready, Service, ServiceRequest, ServiceResponse},
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http::{
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header::{<span class="self">self</span>, HeaderValue},
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Method,
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},
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Error, HttpResponse, <span class="prelude-ty">Result</span>,
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};
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<span class="kw">use </span>futures_util::future::{FutureExt <span class="kw">as _</span>, LocalBoxFuture};
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<span class="kw">use </span>log::debug;
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<span class="kw">use crate</span>::{
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builder::intersperse_header_values,
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inner::{add_vary_header, header_value_try_into_method},
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AllOrSome, CorsError, Inner,
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};
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<span class="doccomment">/// Service wrapper for Cross-Origin Resource Sharing support.
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///
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/// This struct contains the settings for CORS requests to be validated and for responses to
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/// be generated.
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</span><span class="attr">#[doc(hidden)]
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#[derive(Debug, Clone)]
|
||
</span><span class="kw">pub struct </span>CorsMiddleware<S> {
|
||
<span class="kw">pub</span>(<span class="kw">crate</span>) service: S,
|
||
<span class="kw">pub</span>(<span class="kw">crate</span>) inner: Rc<Inner>,
|
||
}
|
||
|
||
<span class="kw">impl</span><S> CorsMiddleware<S> {
|
||
<span class="doccomment">/// Returns true if request is `OPTIONS` and contains an `Access-Control-Request-Method` header.
|
||
</span><span class="kw">fn </span>is_request_preflight(req: <span class="kw-2">&</span>ServiceRequest) -> bool {
|
||
<span class="comment">// check request method is OPTIONS
|
||
</span><span class="kw">if </span>req.method() != Method::OPTIONS {
|
||
<span class="kw">return </span><span class="bool-val">false</span>;
|
||
}
|
||
|
||
<span class="comment">// check follow-up request method is present and valid
|
||
</span><span class="kw">if </span>req
|
||
.headers()
|
||
.get(header::ACCESS_CONTROL_REQUEST_METHOD)
|
||
.and_then(header_value_try_into_method)
|
||
.is_none()
|
||
{
|
||
<span class="kw">return </span><span class="bool-val">false</span>;
|
||
}
|
||
|
||
<span class="bool-val">true
|
||
</span>}
|
||
|
||
<span class="doccomment">/// Validates preflight request headers against configuration and constructs preflight response.
|
||
///
|
||
/// Checks:
|
||
/// - `Origin` header is acceptable;
|
||
/// - `Access-Control-Request-Method` header is acceptable;
|
||
/// - `Access-Control-Request-Headers` header is acceptable.
|
||
</span><span class="kw">fn </span>handle_preflight(<span class="kw-2">&</span><span class="self">self</span>, req: ServiceRequest) -> ServiceResponse {
|
||
<span class="kw">let </span>inner = Rc::clone(<span class="kw-2">&</span><span class="self">self</span>.inner);
|
||
|
||
<span class="kw">match </span>inner.validate_origin(req.head()) {
|
||
<span class="prelude-val">Ok</span>(<span class="bool-val">true</span>) => {}
|
||
<span class="prelude-val">Ok</span>(<span class="bool-val">false</span>) => <span class="kw">return </span>req.error_response(CorsError::OriginNotAllowed),
|
||
<span class="prelude-val">Err</span>(err) => <span class="kw">return </span>req.error_response(err),
|
||
};
|
||
|
||
<span class="kw">if let </span><span class="prelude-val">Err</span>(err) = inner
|
||
.validate_allowed_method(req.head())
|
||
.and_then(|<span class="kw">_</span>| inner.validate_allowed_headers(req.head()))
|
||
{
|
||
<span class="kw">return </span>req.error_response(err);
|
||
}
|
||
|
||
<span class="kw">let </span><span class="kw-2">mut </span>res = HttpResponse::Ok();
|
||
|
||
<span class="kw">if let </span><span class="prelude-val">Some</span>(origin) = inner.access_control_allow_origin(req.head()) {
|
||
res.insert_header((header::ACCESS_CONTROL_ALLOW_ORIGIN, origin));
|
||
}
|
||
|
||
<span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>allowed_methods) = inner.allowed_methods_baked {
|
||
res.insert_header((
|
||
header::ACCESS_CONTROL_ALLOW_METHODS,
|
||
allowed_methods.clone(),
|
||
));
|
||
}
|
||
|
||
<span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>headers) = inner.allowed_headers_baked {
|
||
res.insert_header((header::ACCESS_CONTROL_ALLOW_HEADERS, headers.clone()));
|
||
} <span class="kw">else if let </span><span class="prelude-val">Some</span>(headers) = req.headers().get(header::ACCESS_CONTROL_REQUEST_HEADERS) {
|
||
<span class="comment">// all headers allowed, return
|
||
</span>res.insert_header((header::ACCESS_CONTROL_ALLOW_HEADERS, headers.clone()));
|
||
}
|
||
|
||
<span class="attr">#[cfg(feature = <span class="string">"draft-private-network-access"</span>)]
|
||
</span><span class="kw">if </span>inner.allow_private_network_access
|
||
&& req
|
||
.headers()
|
||
.contains_key(<span class="string">"access-control-request-private-network"</span>)
|
||
{
|
||
res.insert_header((
|
||
header::HeaderName::from_static(<span class="string">"access-control-allow-private-network"</span>),
|
||
HeaderValue::from_static(<span class="string">"true"</span>),
|
||
));
|
||
}
|
||
|
||
<span class="kw">if </span>inner.supports_credentials {
|
||
res.insert_header((
|
||
header::ACCESS_CONTROL_ALLOW_CREDENTIALS,
|
||
HeaderValue::from_static(<span class="string">"true"</span>),
|
||
));
|
||
}
|
||
|
||
<span class="kw">if let </span><span class="prelude-val">Some</span>(max_age) = inner.max_age {
|
||
res.insert_header((header::ACCESS_CONTROL_MAX_AGE, max_age.to_string()));
|
||
}
|
||
|
||
<span class="kw">let </span><span class="kw-2">mut </span>res = res.finish();
|
||
|
||
<span class="kw">if </span>inner.vary_header {
|
||
add_vary_header(res.headers_mut());
|
||
}
|
||
|
||
req.into_response(res)
|
||
}
|
||
|
||
<span class="kw">fn </span>augment_response<B>(
|
||
inner: <span class="kw-2">&</span>Inner,
|
||
origin_allowed: bool,
|
||
<span class="kw-2">mut </span>res: ServiceResponse<B>,
|
||
) -> ServiceResponse<B> {
|
||
<span class="kw">if </span>origin_allowed {
|
||
<span class="kw">if let </span><span class="prelude-val">Some</span>(origin) = inner.access_control_allow_origin(res.request().head()) {
|
||
res.headers_mut()
|
||
.insert(header::ACCESS_CONTROL_ALLOW_ORIGIN, origin);
|
||
};
|
||
}
|
||
|
||
<span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>expose) = inner.expose_headers_baked {
|
||
<span class="macro">log::trace!</span>(<span class="string">"exposing selected headers: {:?}"</span>, expose);
|
||
|
||
res.headers_mut()
|
||
.insert(header::ACCESS_CONTROL_EXPOSE_HEADERS, expose.clone());
|
||
} <span class="kw">else if </span><span class="macro">matches!</span>(inner.expose_headers, AllOrSome::All) {
|
||
<span class="comment">// intersperse_header_values requires that argument is non-empty
|
||
</span><span class="kw">if </span>!res.headers().is_empty() {
|
||
<span class="comment">// extract header names from request
|
||
</span><span class="kw">let </span>expose_all_request_headers = res
|
||
.headers()
|
||
.keys()
|
||
.map(|name| name.as_str())
|
||
.collect::<HashSet<<span class="kw">_</span>>>();
|
||
|
||
<span class="comment">// create comma separated string of header names
|
||
</span><span class="kw">let </span>expose_headers_value = intersperse_header_values(<span class="kw-2">&</span>expose_all_request_headers);
|
||
|
||
<span class="macro">log::trace!</span>(
|
||
<span class="string">"exposing all headers from request: {:?}"</span>,
|
||
expose_headers_value
|
||
);
|
||
|
||
<span class="comment">// add header names to expose response header
|
||
</span>res.headers_mut()
|
||
.insert(header::ACCESS_CONTROL_EXPOSE_HEADERS, expose_headers_value);
|
||
}
|
||
}
|
||
|
||
<span class="kw">if </span>inner.supports_credentials {
|
||
res.headers_mut().insert(
|
||
header::ACCESS_CONTROL_ALLOW_CREDENTIALS,
|
||
HeaderValue::from_static(<span class="string">"true"</span>),
|
||
);
|
||
}
|
||
|
||
<span class="attr">#[cfg(feature = <span class="string">"draft-private-network-access"</span>)]
|
||
</span><span class="kw">if </span>inner.allow_private_network_access
|
||
&& res
|
||
.request()
|
||
.headers()
|
||
.contains_key(<span class="string">"access-control-request-private-network"</span>)
|
||
{
|
||
res.headers_mut().insert(
|
||
header::HeaderName::from_static(<span class="string">"access-control-allow-private-network"</span>),
|
||
HeaderValue::from_static(<span class="string">"true"</span>),
|
||
);
|
||
}
|
||
|
||
<span class="kw">if </span>inner.vary_header {
|
||
add_vary_header(res.headers_mut());
|
||
}
|
||
|
||
res
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><S, B> Service<ServiceRequest> <span class="kw">for </span>CorsMiddleware<S>
|
||
<span class="kw">where
|
||
</span>S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
|
||
S::Future: <span class="lifetime">'static</span>,
|
||
|
||
B: MessageBody + <span class="lifetime">'static</span>,
|
||
{
|
||
<span class="kw">type </span>Response = ServiceResponse<EitherBody<B>>;
|
||
<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><ServiceResponse<EitherBody<B>>, Error>>;
|
||
|
||
<span class="macro">forward_ready!</span>(service);
|
||
|
||
<span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, req: ServiceRequest) -> <span class="self">Self</span>::Future {
|
||
<span class="kw">let </span>origin = req.headers().get(header::ORIGIN);
|
||
|
||
<span class="comment">// handle preflight requests
|
||
</span><span class="kw">if </span><span class="self">self</span>.inner.preflight && <span class="self">Self</span>::is_request_preflight(<span class="kw-2">&</span>req) {
|
||
<span class="kw">let </span>res = <span class="self">self</span>.handle_preflight(req);
|
||
<span class="kw">return </span>ok(res.map_into_right_body()).boxed_local();
|
||
}
|
||
|
||
<span class="comment">// only check actual requests with a origin header
|
||
</span><span class="kw">let </span>origin_allowed = <span class="kw">match </span>(origin, <span class="self">self</span>.inner.validate_origin(req.head())) {
|
||
(<span class="prelude-val">None</span>, <span class="kw">_</span>) => <span class="bool-val">false</span>,
|
||
(<span class="kw">_</span>, <span class="prelude-val">Ok</span>(origin_allowed)) => origin_allowed,
|
||
(<span class="kw">_</span>, <span class="prelude-val">Err</span>(err)) => {
|
||
<span class="macro">debug!</span>(<span class="string">"origin validation failed; inner service is not called"</span>);
|
||
<span class="kw">let </span><span class="kw-2">mut </span>res = req.error_response(err);
|
||
|
||
<span class="kw">if </span><span class="self">self</span>.inner.vary_header {
|
||
add_vary_header(res.headers_mut());
|
||
}
|
||
|
||
<span class="kw">return </span>ok(res.map_into_right_body()).boxed_local();
|
||
}
|
||
};
|
||
|
||
<span class="kw">let </span>inner = Rc::clone(<span class="kw-2">&</span><span class="self">self</span>.inner);
|
||
<span class="kw">let </span>fut = <span class="self">self</span>.service.call(req);
|
||
|
||
Box::pin(<span class="kw">async move </span>{
|
||
<span class="kw">let </span>res = fut.<span class="kw">await</span>;
|
||
<span class="prelude-val">Ok</span>(<span class="self">Self</span>::augment_response(<span class="kw-2">&</span>inner, origin_allowed, res<span class="question-mark">?</span>).map_into_left_body())
|
||
})
|
||
}
|
||
}
|
||
|
||
<span class="attr">#[cfg(test)]
|
||
</span><span class="kw">mod </span>tests {
|
||
<span class="kw">use </span>actix_web::{
|
||
dev::Transform,
|
||
middleware::Compat,
|
||
test::{<span class="self">self</span>, TestRequest},
|
||
App,
|
||
};
|
||
|
||
<span class="kw">use super</span>::<span class="kw-2">*</span>;
|
||
<span class="kw">use </span><span class="kw">crate</span>::Cors;
|
||
|
||
<span class="attr">#[test]
|
||
</span><span class="kw">fn </span>compat_compat() {
|
||
<span class="kw">let _ </span>= App::new().wrap(Compat::new(Cors::default()));
|
||
}
|
||
|
||
<span class="attr">#[actix_web::test]
|
||
</span><span class="kw">async fn </span>test_options_no_origin() {
|
||
<span class="comment">// Tests case where allowed_origins is All but there are validate functions to run incase.
|
||
// In this case, origins are only allowed when the DNT header is sent.
|
||
|
||
</span><span class="kw">let </span>cors = Cors::default()
|
||
.allow_any_origin()
|
||
.allowed_origin_fn(|origin, req_head| {
|
||
<span class="macro">assert_eq!</span>(<span class="kw-2">&</span>origin, req_head.headers.get(header::ORIGIN).unwrap());
|
||
req_head.headers().contains_key(header::DNT)
|
||
})
|
||
.new_transform(test::ok_service())
|
||
.<span class="kw">await
|
||
</span>.unwrap();
|
||
|
||
<span class="kw">let </span>req = TestRequest::get()
|
||
.insert_header((header::ORIGIN, <span class="string">"http://example.com"</span>))
|
||
.to_srv_request();
|
||
<span class="kw">let </span>res = cors.call(req).<span class="kw">await</span>.unwrap();
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="prelude-val">None</span>,
|
||
res.headers()
|
||
.get(header::ACCESS_CONTROL_ALLOW_ORIGIN)
|
||
.map(HeaderValue::as_bytes)
|
||
);
|
||
|
||
<span class="kw">let </span>req = TestRequest::get()
|
||
.insert_header((header::ORIGIN, <span class="string">"http://example.com"</span>))
|
||
.insert_header((header::DNT, <span class="string">"1"</span>))
|
||
.to_srv_request();
|
||
<span class="kw">let </span>res = cors.call(req).<span class="kw">await</span>.unwrap();
|
||
<span class="macro">assert_eq!</span>(
|
||
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b"http://example.com"</span>[..]),
|
||
res.headers()
|
||
.get(header::ACCESS_CONTROL_ALLOW_ORIGIN)
|
||
.map(HeaderValue::as_bytes)
|
||
);
|
||
}
|
||
}
|
||
</code></pre></div></section></main></body></html> |