initial work towards server-side support

sasl/src/client/mod.rs

@@ -0,0 +1,29 @@
+use common::Credentials;
+
+/// A trait which defines SASL mechanisms.
+pub trait Mechanism {
+    /// The name of the mechanism.
+    fn name(&self) -> &str;
+
+    /// Creates this mechanism from `Credentials`.
+    fn from_credentials(credentials: Credentials) -> Result<Self, String>
+    where
+        Self: Sized;
+
+    /// Provides initial payload of the SASL mechanism.
+    fn initial(&mut self) -> Result<Vec<u8>, String> {
+        Ok(Vec::new())
+    }
+
+    /// Creates a response to the SASL challenge.
+    fn response(&mut self, _challenge: &[u8]) -> Result<Vec<u8>, String> {
+        Ok(Vec::new())
+    }
+
+    /// Verifies the server success response, if there is one.
+    fn success(&mut self, _data: &[u8]) -> Result<(), String> {
+        Ok(())
+    }
+}
+
+pub mod mechanisms;