Return fake results for validateaddress and getdifficulty RPCs

zebra-rpc/src/methods/get_block_template_rpcs.rs

@@ -176,6 +176,14 @@ pub trait GetBlockTemplateRpc {
     /// zcashd reference: [`getblocksubsidy`](https://zcash.github.io/rpc/getblocksubsidy.html)
     #[rpc(name = "getblocksubsidy")]
     fn get_block_subsidy(&self, height: Option<u32>) -> BoxFuture<Result<BlockSubsidy>>;
+
+    /// Stub for validate address RPC.
+    #[rpc(name = "validateaddress")]
+    fn validate_address(&self, address: String) -> BoxFuture<Result<ValidateAddressStub>>;
+
+    /// Stub for difficulty RPC.
+    #[rpc(name = "getdifficulty")]
+    fn get_difficulty(&self) -> BoxFuture<Result<f64>>;
 }
 
 /// RPC method implementations.
@@ -829,6 +837,30 @@ where
         }
         .boxed()
     }
+
+    /// Stub for validate address RPC.
+    fn validate_address(&self, address: String) -> BoxFuture<Result<ValidateAddressStub>> {
+        // Just approve all addresses for now
+        async {
+            Ok(ValidateAddressStub {
+                is_valid: true,
+                address,
+            })
+        }
+        .boxed()
+    }
+
+    fn get_difficulty(&self) -> BoxFuture<Result<f64>> {
+        // Just give a dummy answer
+        async { Ok(1.0) }.boxed()
+    }
 }
 
 // Put support functions in a submodule, to keep this file small.
+
+#[derive(Clone, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
+pub struct ValidateAddressStub {
+    #[serde(rename = "isvalid")]
+    pub is_valid: bool,
+    pub address: String,
+}