Middleware для явного указания кодировки в заголовке Content-Type.

src/middlewares/content_type.rs

@@ -0,0 +1,64 @@
+use actix_web::Error;
+use actix_web::body::{BoxBody, EitherBody};
+use actix_web::dev::{Service, ServiceRequest, ServiceResponse, Transform, forward_ready};
+use actix_web::http::header;
+use actix_web::http::header::HeaderValue;
+use futures_util::future::LocalBoxFuture;
+use std::future::{Ready, ready};
+
+/// Middleware to specify the encoding in the Content-Type header.
+pub struct ContentTypeBootstrap;
+
+impl<S, B> Transform<S, ServiceRequest> for ContentTypeBootstrap
+where
+    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
+    S::Future: 'static,
+    B: 'static,
+{
+    type Response = ServiceResponse<EitherBody<B, BoxBody>>;
+    type Error = Error;
+    type Transform = ContentTypeMiddleware<S>;
+    type InitError = ();
+    type Future = Ready<Result<Self::Transform, Self::InitError>>;
+
+    fn new_transform(&self, service: S) -> Self::Future {
+        ready(Ok(ContentTypeMiddleware { service }))
+    }
+}
+
+pub struct ContentTypeMiddleware<S> {
+    service: S,
+}
+
+impl<'a, S, B> Service<ServiceRequest> for ContentTypeMiddleware<S>
+where
+    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
+    S::Future: 'static,
+    B: 'static,
+{
+    type Response = ServiceResponse<EitherBody<B, BoxBody>>;
+    type Error = Error;
+    type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
+
+    forward_ready!(service);
+
+    fn call(&self, req: ServiceRequest) -> Self::Future {
+        let fut = self.service.call(req);
+
+        Box::pin(async move {
+            let mut response = fut.await?;
+
+            let headers = response.response_mut().headers_mut();
+            if let Some(content_type) = headers.get("Content-Type") {
+                if content_type == "application/json" {
+                    headers.insert(
+                        header::CONTENT_TYPE,
+                        HeaderValue::from_static("application/json; charset=utf8"),
+                    );
+                }
+            }
+
+            Ok(response.map_into_left_body())
+        })
+    }
+}

src/middlewares/mod.rs

@@ -1 +1,2 @@
-pub mod authorization;
+pub mod authorization;
+pub mod content_type;