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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">future::Future</span>, <span class="ident">pin::Pin</span>, <span class="ident">rc::Rc</span>};
<span class="kw">use</span> <span class="ident">actix_session::UserSession</span>;
<span class="kw">use</span> <span class="ident">actix_utils::future</span>::{<span class="ident">ok</span>, <span class="ident">Ready</span>};
<span class="kw">use</span> <span class="ident">actix_web</span>::{
<span class="ident">body::EitherBody</span>,
<span class="ident">cookie::Cookie</span>,
<span class="ident">dev</span>::{<span class="ident">forward_ready</span>, <span class="ident">Service</span>, <span class="ident">ServiceRequest</span>, <span class="ident">ServiceResponse</span>, <span class="ident">Transform</span>},
<span class="ident">http</span>::{<span class="ident">header::COOKIE</span>, <span class="ident">StatusCode</span>},
<span class="ident">web</span>, <span class="ident">Error</span>, <span class="ident">HttpResponse</span>,
};
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::Limiter</span>;
<span class="doccomment">/// Rate limit middleware.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RateLimiter</span>;
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">Transform</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">ServiceRequest</span><span class="op">></span> <span class="kw">for</span> <span class="ident">RateLimiter</span>
<span class="kw">where</span>
<span class="ident">S</span>: <span class="ident">Service</span><span class="op"><</span><span class="ident">ServiceRequest</span>, <span class="ident">Response</span> <span class="op">=</span> <span class="ident">ServiceResponse</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Error</span><span class="op">></span> <span class="op">+</span> <span class="lifetime">'static</span>,
<span class="ident">S::Future</span>: <span class="lifetime">'static</span>,
<span class="ident">B</span>: <span class="lifetime">'static</span>,
{
<span class="kw">type</span> <span class="ident">Response</span> <span class="op">=</span> <span class="ident">ServiceResponse</span><span class="op"><</span><span class="ident">EitherBody</span><span class="op"><</span><span class="ident">B</span><span class="op">></span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Error</span>;
<span class="kw">type</span> <span class="ident">Transform</span> <span class="op">=</span> <span class="ident">RateLimiterMiddleware</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">InitError</span> <span class="op">=</span> ();
<span class="kw">type</span> <span class="ident">Future</span> <span class="op">=</span> <span class="ident">Ready</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Transform</span>, <span class="ident"><span class="self">Self</span>::InitError</span><span class="op">></span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">new_transform</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">service</span>: <span class="ident">S</span>) -> <span class="ident"><span class="self">Self</span>::Future</span> {
<span class="ident">ok</span>(<span class="ident">RateLimiterMiddleware</span> {
<span class="ident">service</span>: <span class="ident">Rc::new</span>(<span class="ident">service</span>),
})
}
}
<span class="doccomment">/// Rate limit middleware service.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RateLimiterMiddleware</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> {
<span class="ident">service</span>: <span class="ident">Rc</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">Service</span><span class="op"><</span><span class="ident">ServiceRequest</span><span class="op">></span> <span class="kw">for</span> <span class="ident">RateLimiterMiddleware</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">S</span>: <span class="ident">Service</span><span class="op"><</span><span class="ident">ServiceRequest</span>, <span class="ident">Response</span> <span class="op">=</span> <span class="ident">ServiceResponse</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Error</span><span class="op">></span> <span class="op">+</span> <span class="lifetime">'static</span>,
<span class="ident">S::Future</span>: <span class="lifetime">'static</span>,
<span class="ident">B</span>: <span class="lifetime">'static</span>,
{
<span class="kw">type</span> <span class="ident">Response</span> <span class="op">=</span> <span class="ident">ServiceResponse</span><span class="op"><</span><span class="ident">EitherBody</span><span class="op"><</span><span class="ident">B</span><span class="op">></span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Error</span>;
<span class="kw">type</span> <span class="ident">Future</span> <span class="op">=</span> <span class="ident">Pin</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Future</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Response</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">></span><span class="op">></span><span class="op">></span><span class="op">></span>;
<span class="macro">forward_ready!</span>(<span class="ident">service</span>);
<span class="kw">fn</span> <span class="ident">call</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">req</span>: <span class="ident">ServiceRequest</span>) -> <span class="ident"><span class="self">Self</span>::Future</span> {
<span class="comment">// A mis-configuration of the Actix App will result in a **runtime** failure, so the expect</span>
<span class="comment">// method description is important context for the developer.</span>
<span class="kw">let</span> <span class="ident">limiter</span> <span class="op">=</span> <span class="ident">req</span>
.<span class="ident">app_data</span>::<span class="op"><</span><span class="ident">web::Data</span><span class="op"><</span><span class="ident">Limiter</span><span class="op">></span><span class="op">></span>()
.<span class="ident">expect</span>(<span class="string">"web::Data<Limiter> should be set in app data for RateLimiter middleware"</span>)
.<span class="ident">clone</span>();
<span class="kw">let</span> (<span class="ident">key</span>, <span class="ident">fallback</span>) <span class="op">=</span> <span class="ident">key</span>(<span class="kw-2">&</span><span class="ident">req</span>, <span class="ident">limiter</span>.<span class="ident">clone</span>());
<span class="kw">let</span> <span class="ident">service</span> <span class="op">=</span> <span class="ident">Rc::clone</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">service</span>);
<span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">key</span> {
<span class="prelude-val">Some</span>(<span class="ident">key</span>) => <span class="ident">key</span>,
<span class="prelude-val">None</span> => <span class="kw">match</span> <span class="ident">fallback</span> {
<span class="prelude-val">Some</span>(<span class="ident">key</span>) => <span class="ident">key</span>,
<span class="prelude-val">None</span> => {
<span class="kw">return</span> <span class="ident">Box::pin</span>(<span class="kw">async</span> <span class="kw">move</span> {
<span class="ident">service</span>
.<span class="ident">call</span>(<span class="ident">req</span>)
.<span class="kw">await</span>
.<span class="ident">map</span>(<span class="ident">ServiceResponse::map_into_left_body</span>)
});
}
},
};
<span class="ident">Box::pin</span>(<span class="kw">async</span> <span class="kw">move</span> {
<span class="kw">let</span> <span class="ident">status</span> <span class="op">=</span> <span class="ident">limiter</span>.<span class="ident">count</span>(<span class="ident">key</span>.<span class="ident">to_string</span>()).<span class="kw">await</span>;
<span class="kw">if</span> <span class="ident">status</span>.<span class="ident">is_err</span>() {
<span class="macro">log::warn!</span>(<span class="string">"Rate limit exceed error for {}"</span>, <span class="ident">key</span>);
<span class="prelude-val">Ok</span>(<span class="ident">req</span>.<span class="ident">into_response</span>(
<span class="ident">HttpResponse::new</span>(<span class="ident">StatusCode::TOO_MANY_REQUESTS</span>).<span class="ident">map_into_right_body</span>(),
))
} <span class="kw">else</span> {
<span class="ident">service</span>
.<span class="ident">call</span>(<span class="ident">req</span>)
.<span class="kw">await</span>
.<span class="ident">map</span>(<span class="ident">ServiceResponse::map_into_left_body</span>)
}
})
}
}
<span class="kw">fn</span> <span class="ident">key</span>(<span class="ident">req</span>: <span class="kw-2">&</span><span class="ident">ServiceRequest</span>, <span class="ident">limiter</span>: <span class="ident">web::Data</span><span class="op"><</span><span class="ident">Limiter</span><span class="op">></span>) -> (<span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">session</span> <span class="op">=</span> <span class="ident">req</span>.<span class="ident">get_session</span>();
<span class="kw">let</span> <span class="ident">result</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> <span class="op">=</span> <span class="ident">session</span>.<span class="ident">get</span>(<span class="kw-2">&</span><span class="ident">limiter</span>.<span class="ident">session_key</span>).<span class="ident">unwrap_or</span>(<span class="prelude-val">None</span>);
<span class="kw">let</span> <span class="ident">cookies</span> <span class="op">=</span> <span class="ident">req</span>.<span class="ident">headers</span>().<span class="ident">get_all</span>(<span class="ident">COOKIE</span>);
<span class="kw">let</span> <span class="ident">cookie</span> <span class="op">=</span> <span class="ident">cookies</span>
.<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span>.<span class="ident">to_str</span>().<span class="ident">ok</span>())
.<span class="ident">find</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span>.<span class="ident">contains</span>(<span class="ident">limiter</span>.<span class="ident">cookie_name</span>.<span class="ident">as_ref</span>()));
<span class="kw">let</span> <span class="ident">fallback</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">cookie</span> {
<span class="prelude-val">Some</span>(<span class="ident">value</span>) => <span class="ident">Cookie::parse</span>(<span class="ident">value</span>).<span class="ident">ok</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span>.<span class="ident">to_string</span>()),
<span class="prelude-val">None</span> => <span class="prelude-val">None</span>,
};
(<span class="ident">result</span>, <span class="ident">fallback</span>)
}
</code></pre></div>
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