Add support for authenticated endpoints.

src/error.rs

@@ -14,6 +14,8 @@ pub enum Error {
     SerdeJson(SerdeJsonError),
     /// An error when serializing a query string value.
     SerdeUrlEncodedSerialize(SerdeUrlEncodedSerializeError),
+    /// Queried endpoint requires authentication but was called on an anonymous client
+    AuthenticationRequired
 }
 
 impl From<HyperError> for Error {

src/lib.rs

@@ -84,6 +84,14 @@ impl Client {
 
         url.set_query(Some(&serde_urlencoded::to_string(&query_params)?));
 
+        if E::requires_authentication() {
+            if let Some(ref session) = self.session {
+                url.query_pairs_mut().append_pair("access_token", &session.access_token);
+            } else {
+                return Err(Error::AuthenticationRequired)
+            }
+        }
+
         let mut request = HyperRequest::new(E::method().into_hyper(), url);
 
         match E::method() {

src/session.rs

@@ -4,7 +4,10 @@ use url::Host;
 /// An active user session with a Matrix homeserver, allowing authenticated requests.
 #[derive(Clone, Debug)]
 pub struct Session {
-    access_token: String,
-    homeserver: Host,
-    user_id: UserId,
+    /// The access token of this session
+    pub access_token: String,
+    /// The homeserver this session is associated with
+    pub homeserver: Host,
+    /// the ID of the user owning this session
+    pub user_id: UserId,
 }