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</pre><pre class="rust ">
<span class="doccomment">//! Default response headers</span>
<span class="kw">use</span> <span class="ident">http</span>::<span class="ident">header</span>::{<span class="ident">HeaderName</span>, <span class="ident">HeaderValue</span>, <span class="ident">CONTENT_TYPE</span>};
<span class="kw">use</span> <span class="ident">http</span>::{<span class="ident">HeaderMap</span>, <span class="ident">HttpTryFrom</span>};
<span class="kw">use</span> <span class="ident">error</span>::<span class="prelude-ty">Result</span>;
<span class="kw">use</span> <span class="ident">httprequest</span>::<span class="ident">HttpRequest</span>;
<span class="kw">use</span> <span class="ident">httpresponse</span>::<span class="ident">HttpResponse</span>;
<span class="kw">use</span> <span class="ident">middleware</span>::{<span class="ident">Middleware</span>, <span class="ident">Response</span>};
<span class="doccomment">/// `Middleware` for setting default response headers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This middleware does not set header if response headers already contains it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # extern crate actix_web;</span>
<span class="doccomment">/// use actix_web::{http, middleware, App, HttpResponse};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// let app = App::new()</span>
<span class="doccomment">/// .middleware(middleware::DefaultHeaders::new().header("X-Version", "0.2"))</span>
<span class="doccomment">/// .resource("/test", |r| {</span>
<span class="doccomment">/// r.method(http::Method::GET).f(|_| HttpResponse::Ok());</span>
<span class="doccomment">/// r.method(http::Method::HEAD)</span>
<span class="doccomment">/// .f(|_| HttpResponse::MethodNotAllowed());</span>
<span class="doccomment">/// })</span>
<span class="doccomment">/// .finish();</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DefaultHeaders</span> {
<span class="ident">ct</span>: <span class="ident">bool</span>,
<span class="ident">headers</span>: <span class="ident">HeaderMap</span>,
}
<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">DefaultHeaders</span> {
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="self">Self</span> {
<span class="ident">DefaultHeaders</span> {
<span class="ident">ct</span>: <span class="bool-val">false</span>,
<span class="ident">headers</span>: <span class="ident">HeaderMap</span>::<span class="ident">new</span>(),
}
}
}
<span class="kw">impl</span> <span class="ident">DefaultHeaders</span> {
<span class="doccomment">/// Construct `DefaultHeaders` middleware.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">DefaultHeaders</span> {
<span class="ident">DefaultHeaders</span>::<span class="ident">default</span>()
}
<span class="doccomment">/// Set a header.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cargo-clippy"</span>, <span class="ident">allow</span>(<span class="ident">clippy</span>::<span class="ident">match_wild_err_arm</span>))]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">header</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">K</span>, <span class="ident">value</span>: <span class="ident">V</span>) <span class="op">-></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">HeaderName</span>: <span class="ident">HttpTryFrom</span><span class="op"><</span><span class="ident">K</span><span class="op">></span>,
<span class="ident">HeaderValue</span>: <span class="ident">HttpTryFrom</span><span class="op"><</span><span class="ident">V</span><span class="op">></span>,
{
<span class="kw">match</span> <span class="ident">HeaderName</span>::<span class="ident">try_from</span>(<span class="ident">key</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">key</span>) <span class="op">=></span> <span class="kw">match</span> <span class="ident">HeaderValue</span>::<span class="ident">try_from</span>(<span class="ident">value</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">value</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">headers</span>.<span class="ident">append</span>(<span class="ident">key</span>, <span class="ident">value</span>);
}
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Can not create header value"</span>),
},
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Can not create header name"</span>),
}
<span class="self">self</span>
}
<span class="doccomment">/// Set *CONTENT-TYPE* header if response does not contain this header.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">content_type</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">ct</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="self">self</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> <span class="ident">Middleware</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> <span class="kw">for</span> <span class="ident">DefaultHeaders</span> {
<span class="kw">fn</span> <span class="ident">response</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="ident">HttpRequest</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>, <span class="kw-2">mut</span> <span class="ident">resp</span>: <span class="ident">HttpResponse</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Response</span><span class="op">></span> {
<span class="kw">for</span> (<span class="ident">key</span>, <span class="ident">value</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">headers</span>.<span class="ident">iter</span>() {
<span class="kw">if</span> <span class="op">!</span><span class="ident">resp</span>.<span class="ident">headers</span>().<span class="ident">contains_key</span>(<span class="ident">key</span>) {
<span class="ident">resp</span>.<span class="ident">headers_mut</span>().<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">value</span>.<span class="ident">clone</span>());
}
}
<span class="comment">// default content-type</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">ct</span> <span class="op">&&</span> <span class="op">!</span><span class="ident">resp</span>.<span class="ident">headers</span>().<span class="ident">contains_key</span>(<span class="ident">CONTENT_TYPE</span>) {
<span class="ident">resp</span>.<span class="ident">headers_mut</span>().<span class="ident">insert</span>(
<span class="ident">CONTENT_TYPE</span>,
<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">"application/octet-stream"</span>),
);
}
<span class="prelude-val">Ok</span>(<span class="ident">Response</span>::<span class="ident">Done</span>(<span class="ident">resp</span>))
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">http</span>::<span class="ident">header</span>::<span class="ident">CONTENT_TYPE</span>;
<span class="kw">use</span> <span class="ident">test</span>::<span class="ident">TestRequest</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_default_headers</span>() {
<span class="kw">let</span> <span class="ident">mw</span> <span class="op">=</span> <span class="ident">DefaultHeaders</span>::<span class="ident">new</span>().<span class="ident">header</span>(<span class="ident">CONTENT_TYPE</span>, <span class="string">"0001"</span>);
<span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>().<span class="ident">finish</span>();
<span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>().<span class="ident">finish</span>();
<span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">mw</span>.<span class="ident">response</span>(<span class="kw-2">&</span><span class="ident">req</span>, <span class="ident">resp</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">Response</span>::<span class="ident">Done</span>(<span class="ident">resp</span>)) <span class="op">=></span> <span class="ident">resp</span>,
<span class="kw">_</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(),
};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">headers</span>().<span class="ident">get</span>(<span class="ident">CONTENT_TYPE</span>).<span class="ident">unwrap</span>(), <span class="string">"0001"</span>);
<span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="ident">HttpResponse</span>::<span class="prelude-val">Ok</span>().<span class="ident">header</span>(<span class="ident">CONTENT_TYPE</span>, <span class="string">"0002"</span>).<span class="ident">finish</span>();
<span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">mw</span>.<span class="ident">response</span>(<span class="kw-2">&</span><span class="ident">req</span>, <span class="ident">resp</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">Response</span>::<span class="ident">Done</span>(<span class="ident">resp</span>)) <span class="op">=></span> <span class="ident">resp</span>,
<span class="kw">_</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(),
};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">headers</span>().<span class="ident">get</span>(<span class="ident">CONTENT_TYPE</span>).<span class="ident">unwrap</span>(), <span class="string">"0002"</span>);
}
}
</pre>
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