Can respond to a friendship request

src/data/http_request_handler.rs

@@ -384,6 +384,14 @@ impl HttpRequestHandler {
         self.user_id_opt().unwrap_or(UserID::invalid())
     }
 
+    /// Get user ID as a reference
+    pub fn user_id_ref(&self) -> ResultBoxError<&UserID> {
+        match self.curr_user_id.as_ref() {
+            Some(s) => Ok(s),
+            None => Err(ExecError::boxed_new("Could not get required user ID!"))
+        }
+    }
+
     /// Get an email included in the request
     pub fn post_email(&mut self, name: &str) -> ResultBoxError<String> {
         let mail = self.post_string(name)?;