Add Cargo workspace + common crate with Mode and Method types

common/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod policy;
+pub mod types;

common/src/policy.rs

@@ -0,0 +1 @@
+// Policy parsing implemented in Phase 2.

common/src/types.rs

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+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Mode {
+    Disabled,
+    Optional,
+    Required,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Method {
+    Fido2,
+    Totp,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn mode_serializes_to_lowercase() {
+        let m = Mode::Required;
+        let s = serde_json::to_string(&m).unwrap();
+        assert_eq!(s, "\"required\"");
+    }
+
+    #[test]
+    fn method_serializes_to_lowercase() {
+        let m = Method::Fido2;
+        let s = serde_json::to_string(&m).unwrap();
+        assert_eq!(s, "\"fido2\"");
+    }
+}