feat: allow checking if a given e-cash note is spent

Kodylow · Nov 6, 2024 · 57cf5e0 · 57cf5e0
1 parent b41bc17
commit 57cf5e0
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/modules/fedimint-mint-common/src/endpoint_constants.rs b/modules/fedimint-mint-common/src/endpoint_constants.rs
@@ -1,3 +1,4 @@
 pub const AWAIT_OUTPUT_OUTCOME_ENDPOINT: &str = "await_output_outcome";
 pub const BACKUP_ENDPOINT: &str = "backup";
 pub const RECOVER_ENDPOINT: &str = "recover";
+pub const NOTE_SPENT_ENDPOINT: &str = "note_spent";
diff --git a/modules/fedimint-mint-server/src/lib.rs b/modules/fedimint-mint-server/src/lib.rs
@@ -58,6 +58,8 @@ use threshold_crypto::group::Curve;
 use threshold_crypto::{G2Projective, Scalar};
 use tracing::{debug, info};
 
+use crate::common::endpoint_constants::NOTE_SPENT_ENDPOINT;
+use crate::common::Nonce;
 use crate::db::{
     DbKeyPrefix, ECashUserBackupSnapshot, EcashBackupKey, EcashBackupKeyPrefix, MintAuditItemKey,
     MintAuditItemKeyPrefix, MintOutputOutcomeKey, MintOutputOutcomePrefix, NonceKey,
@@ -136,7 +138,7 @@ impl ServerModuleInit for MintInit {
                 MODULE_CONSENSUS_VERSION.major,
                 MODULE_CONSENSUS_VERSION.minor,
             ),
-            &[(0, 0)],
+            &[(0, 1)],
         )
     }
 
@@ -526,6 +528,13 @@ impl ServerModule for Mint {
                         .handle_recover_request(&mut context.dbtx().into_nc(), id).await)
                 }
             },
+            api_endpoint! {
+                NOTE_SPENT_ENDPOINT,
+                ApiVersion::new(0, 1),
+                async |_module: &Mint, context, nonce: Nonce| -> bool {
+                    Ok(context.dbtx().get_value(&NonceKey(nonce)).await.is_some())
+                }
+            },
         ]
     }
 }