feat(rust/rbac-registration): Add the RegistrationChain::stake_addresses helper (#276)

* Add the RegistrationChain::stake_addresses helper

* Rename method

Author: stanislav-tkach

rust/rbac-registration/src/registration/cardano/mod.rs

@@ -6,9 +6,10 @@ use std::{collections::HashMap, sync::Arc};
 
 use anyhow::bail;
 use c509_certificate::c509::C509;
-use cardano_blockchain_types::TransactionId;
+use cardano_blockchain_types::{Cip0134Uri, StakeAddress, TransactionId};
 use catalyst_types::{id_uri::IdUri, uuid::UuidV4};
 use ed25519_dalek::VerifyingKey;
+use pallas::ledger::addresses::Address;
 use tracing::error;
 use update_rbac::{
     revocations_list, update_c509_certs, update_public_keys, update_role_data, update_x509_certs,
@@ -204,6 +205,21 @@ impl RegistrationChain {
             .get(role)
             .and_then(|rdr| rdr.encryption_key_from_rotation(rotation))
     }
+
+    /// Returns a list of role 0 stake addresses.
+    #[must_use]
+    pub fn role_0_stake_addresses(&self) -> Vec<StakeAddress> {
+        let mut result = Vec::new();
+
+        if let Some(uris) = self.inner.certificate_uris.x_uris().get(&0) {
+            result.extend(convert_stake_addresses(uris));
+        }
+        if let Some(uris) = self.inner.certificate_uris.c_uris().get(&0) {
+            result.extend(convert_stake_addresses(uris));
+        }
+
+        result
+    }
 }
 
 /// Inner structure of registration chain.
@@ -391,6 +407,18 @@ impl RegistrationChainInner {
     }
 }
 
+/// Converts a list of `Cip0134Uri` to a list of stake addresses.
+fn convert_stake_addresses(uris: &[Cip0134Uri]) -> Vec<StakeAddress> {
+    uris.iter()
+        .filter_map(|uri| {
+            match uri.address() {
+                Address::Stake(a) => Some(a.clone().into()),
+                _ => None,
+            }
+        })
+        .collect()
+}
+
 #[cfg(test)]
 mod test {
     use super::*;