Add 'allow-data-mutation' feature flag to expose 'local()' method in …

…Request module

core/lib/Cargo.toml

@@ -28,6 +28,7 @@ secrets = ["rocket_http/private-cookies"]
 json = ["serde_json", "tokio/io-util"]
 msgpack = ["rmp-serde", "tokio/io-util"]
 uuid = ["uuid_", "rocket_http/uuid"]
+allow-data-mutation = []
 
 [dependencies]
 # Serialization dependencies.

core/lib/src/data/data.rs

@@ -56,6 +56,17 @@ impl<'r> Data<'r> {
     }
 
     /// This creates a `data` object from a local data source `data`.
+    #[cfg(feature = "allow-data-mutation")]
+    #[inline]
+    pub fn local(data: Vec<u8>) -> Data<'r> {
+        Data {
+            buffer: data,
+            stream: StreamReader::empty(),
+            is_complete: true,
+        }
+    }
+
+    #[cfg(not(feature = "allow-data-mutation"))]
     #[inline]
     pub(crate) fn local(data: Vec<u8>) -> Data<'r> {
         Data {

core/lib/src/request/request.rs

@@ -29,6 +29,9 @@ pub struct Request<'r> {
     method: Atomic<Method>,
     uri: Origin<'r>,
     headers: HeaderMap<'r>,
+    /// Additional data added before request is processed
+    #[cfg(feature = "allow-data-mutation")]
+    pub meta: std::collections::HashMap<String, String>,
     pub(crate) connection: ConnectionMeta,
     pub(crate) state: RequestState<'r>,
 }
@@ -58,6 +61,8 @@ impl Request<'_> {
             method: Atomic::new(self.method()),
             uri: self.uri.clone(),
             headers: self.headers.clone(),
+            #[cfg(feature = "allow-data-mutation")]
+            meta: self.meta.clone(),
             connection: self.connection.clone(),
             state: self.state.clone(),
         }
@@ -90,6 +95,8 @@ impl<'r> Request<'r> {
             uri,
             method: Atomic::new(method),
             headers: HeaderMap::new(),
+            #[cfg(feature = "allow-data-mutation")]
+            meta: std::collections::HashMap::new(),
             connection: ConnectionMeta {
                 remote: None,
                 client_certificates: None,