attestation-service: implement *_policy() methods for EAR token broker

without the changes, kbs-client "set-attestation-policy" gets
"not supported" errors.

the changes are taken from 'simple' token broker. Both token
brokers have a policy_engine instance created.

Signed-off-by: Mikko Ylinen <[email protected]>

attestation-service/src/token/ear_broker.rs

@@ -299,6 +299,27 @@ impl AttestationTokenBroker for EarAttestationTokenBroker {
 
         Ok(signed_ear)
     }
+
+    async fn set_policy(&self, policy_id: String, policy: String) -> Result<()> {
+        self.policy_engine
+            .set_policy(policy_id, policy)
+            .await
+            .map_err(Error::from)
+    }
+
+    async fn list_policies(&self) -> Result<HashMap<String, String>> {
+        self.policy_engine
+            .list_policies()
+            .await
+            .map_err(Error::from)
+    }
+
+    async fn get_policy(&self, policy_id: String) -> Result<String> {
+        self.policy_engine
+            .get_policy(policy_id)
+            .await
+            .map_err(Error::from)
+    }
 }
 
 impl EarAttestationTokenBroker {