init cache control

Author: yoshuawuyts

src/cache/cache_control.rs

@@ -0,0 +1,41 @@
+/// An HTTP `Cache-Control` directive.
+#[derive(Debug)]
+pub enum CacheDirective {
+    Immutable,
+    MaxAge(Duration),
+    MaxStale(Option<Duration>),
+    MinFresh(Duration),
+    MustRevalidate,
+    NoCache,
+    NoStore,
+    NoTransform,
+    OnlyIfCached,
+    Private,
+    ProxyRevalidate,
+    Public,
+    SMaxAge(Duration),
+    StaleIfError(Duration),
+    StaleWhileRevalidate(Duration),
+}
+
+impl CacheDirective {
+    /// Check whether this directive is valid in an HTTP request.
+    pub fn is_req(&self) -> bool {
+        use Self::*;
+        match self {
+            MaxAge(_) | MaxStale(_) | MinFresh(_) | NoCache | NoStore | NoTransform
+            | OnlyIfCached => true,
+            _ => false,
+        }
+    }
+
+    /// Check whether this directive is valid in an HTTP response.
+    pub fn is_res(&self) -> bool {
+        use Self::*;
+        match self {
+            MustRevalidate | NoCache | NoStore | NoTransform | Public | Private
+            | ProxyRevalidate | MaxAge(_) | SMaxAge(_) => true,
+            _ => false,
+        }
+    }
+}

src/cache/mod.rs

@@ -0,0 +1 @@
+mod cache_control;