feat(admin): expose replication capabilities

crates/replication/src/config.rs

@@ -26,6 +26,53 @@ use serde::{Deserialize, Serialize};
 use std::collections::{HashMap, HashSet};
 use uuid::Uuid;
 
+pub const REPLICATION_CAPABILITY_CONTRACT_VERSION: u32 = 1;
+
+pub const REPLICATION_WRITABLE_FIELDS: &[&str] = &[
+    "Role",
+    "Rule.ID",
+    "Rule.Status",
+    "Rule.Priority",
+    "Rule.Filter.Prefix",
+    "Rule.Filter.Tag",
+    "Rule.Filter.And",
+    "Rule.Destination.Bucket",
+    "Rule.ExistingObjectReplication.Status",
+    "Rule.DeleteMarkerReplication.Status",
+    "Rule.DeleteReplication.Status",
+    "Rule.SourceSelectionCriteria.ReplicaModifications.Status",
+];
+
+pub const REPLICATION_READ_ONLY_HISTORICAL_FIELDS: &[&str] = &[
+    "SourceSelectionCriteria.SseKmsEncryptedObjects",
+    "Destination.EncryptionConfiguration",
+    "Destination.Metrics",
+    "Destination.ReplicationTime",
+];
+
+pub const REMOTE_TARGET_CAPABILITY_CONTRACT_VERSION: u32 = 1;
+
+pub const REMOTE_TARGET_WRITABLE_FIELDS: &[&str] = &[
+    "sourcebucket",
+    "endpoint",
+    "credentials.accessKey",
+    "credentials.secretKey",
+    "targetbucket",
+    "secure",
+    "path",
+    "api",
+    "arn",
+    "type",
+    "region",
+    "bandwidth",
+    "replicationSync",
+    "storage_class",
+    "skipTlsVerify",
+    "caCertPem",
+];
+
+pub const REMOTE_TARGET_UNSUPPORTED_FIELDS: &[&str] = &["disableProxy", "healthCheckDuration", "edge", "edgeSyncBeforeExpiry"];
+
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct ObjectOpts {
     pub name: String,
@@ -831,6 +878,34 @@ mod tests {
         assert_eq!(unsupported_replication_config_field(&config), Some("Destination.ReplicationTime"));
     }
 
+    #[test]
+    fn capability_fields_match_validator_rejections() {
+        let rejected_fields = [
+            "SourceSelectionCriteria.SseKmsEncryptedObjects",
+            "Destination.EncryptionConfiguration",
+            "Destination.Metrics",
+            "Destination.ReplicationTime",
+        ];
+
+        for field in rejected_fields {
+            assert!(
+                REPLICATION_READ_ONLY_HISTORICAL_FIELDS.contains(&field),
+                "rejected field {field} must be advertised as readable historical data"
+            );
+            assert!(
+                !REPLICATION_WRITABLE_FIELDS.contains(&field),
+                "rejected field {field} must not be advertised as writable"
+            );
+        }
+
+        for field in REPLICATION_WRITABLE_FIELDS {
+            assert!(
+                !REPLICATION_READ_ONLY_HISTORICAL_FIELDS.contains(field),
+                "field {field} cannot be both writable and historical-only"
+            );
+        }
+    }
+
     #[test]
     fn invalid_replication_status_fields_are_reported_before_persistence() {
         let arn = "arn:rustfs:replication:us-east-1:target:bucket";

crates/replication/src/lib.rs

@@ -29,7 +29,9 @@ mod storage_api;
 pub mod tagging;
 
 pub use config::{
-    ObjectOpts, ReplicationConfigurationExt, ReplicationTargetValidationError, active_replication_rule_destination_arns,
+    ObjectOpts, REMOTE_TARGET_CAPABILITY_CONTRACT_VERSION, REMOTE_TARGET_UNSUPPORTED_FIELDS, REMOTE_TARGET_WRITABLE_FIELDS,
+    REPLICATION_CAPABILITY_CONTRACT_VERSION, REPLICATION_READ_ONLY_HISTORICAL_FIELDS, REPLICATION_WRITABLE_FIELDS,
+    ReplicationConfigurationExt, ReplicationTargetValidationError, active_replication_rule_destination_arns,
     invalid_replication_config_status_field, replication_target_arns, should_remove_replication_target,
     unsupported_replication_config_field, validate_replication_config_target_arns,
 };