feat(minibf): add /governance/proposals/*/metadata routes

crates/core/src/config.rs

@@ -928,6 +928,8 @@ pub struct MinibfConfig {
     pub url: Option<String>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     max_scan_items: Option<u64>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    ipfs_gateways: Option<Vec<String>>,
 }
 
 impl MinibfConfig {
@@ -938,6 +940,7 @@ impl MinibfConfig {
             token_registry_url: None,
             url: None,
             max_scan_items: None,
+            ipfs_gateways: None,
         }
     }
 
@@ -958,6 +961,19 @@ impl MinibfConfig {
     pub fn max_scan_items(&self) -> u64 {
         self.max_scan_items.unwrap_or(default_max_scan_items())
     }
+
+    /// These are the base URLs of the HTTP gateways, in order. The gateways
+    /// resolve `ipfs://` governance-anchor URLs. Dolos sends a request to each
+    /// gateway in order. Dolos stops at the first gateway that serves the
+    /// content. cardano-db-sync resolves `ipfs://` anchors the same way.
+    ///
+    /// An absent setting gives the default list. An empty list stops IPFS
+    /// resolution, so `ipfs://` anchors do not resolve.
+    pub fn ipfs_gateways(&self) -> Vec<String> {
+        self.ipfs_gateways
+            .clone()
+            .unwrap_or_else(default_ipfs_gateways)
+    }
 }
 
 #[derive(Deserialize, Serialize, Clone)]
@@ -1036,6 +1052,18 @@ fn default_max_scan_items() -> u64 {
     3000
 }
 
+fn default_ipfs_gateways() -> Vec<String> {
+    // The main public gateway is first. A fallback gateway is second. If the
+    // first gateway returns HTTP 429, the resolver uses the fallback.
+    // cardano-db-sync uses the same two-entry shape. There the second entry is
+    // a private gateway of Blockfrost that pins the content. Dolos has no
+    // private infrastructure, so Dolos names a second public gateway.
+    vec![
+        "https://ipfs.io".to_string(),
+        "https://gateway.pinata.cloud".to_string(),
+    ]
+}
+
 #[derive(Deserialize, Serialize, Clone, Default)]
 pub struct ServeConfig {
     pub ouroboros: Option<OuroborosConfig>,

crates/minibf/Cargo.toml

@@ -6,7 +6,7 @@ edition.workspace = true
 [dependencies]
 tracing.workspace = true
 serde.workspace = true
-tokio.workspace = true
+tokio = { workspace = true, features = ["net"] }
 tokio-util.workspace = true
 pallas.workspace = true
 tower = { workspace = true, features = ["util"] }

crates/minibf/src/lib.rs

@@ -638,6 +638,14 @@ where
             "/governance/proposals/{gov_action_id}",
             get(routes::governance::proposal_by_gov_action_id::<D>),
         )
+        .route(
+            "/governance/proposals/{tx_hash}/{cert_index}/metadata",
+            get(routes::governance::proposal_metadata::<D>),
+        )
+        .route(
+            "/governance/proposals/{gov_action_id}/metadata",
+            get(routes::governance::proposal_metadata_by_gov_action::<D>),
+        )
         .route(
             "/governance/proposals/{tx_hash}/{cert_index}/withdrawals",
             get(routes::governance::proposal_withdrawals::<D>),