feat: add /contract/implementation

Author: Destiner

src/routes/contract/controller.ts

@@ -264,6 +264,17 @@ async function getAbi(
   return abi;
 }
 
+async function getImplementationAddress(
+  chain: ChainId,
+  address: Address,
+): Promise<Address | null> {
+  const contract = await getSource(chain, address);
+  if (!contract) {
+    return null;
+  }
+  return contract.implementation?.address ?? null;
+}
+
 async function getDeployment(
   chain: ChainId,
   address: Address,
@@ -415,4 +426,4 @@ async function fetchDeployment(
   };
 }
 
-export { getAll, getSource, getAbi, getDeployment };
+export { getAll, getSource, getAbi, getImplementationAddress, getDeployment };

src/routes/contract/router.ts

@@ -5,7 +5,7 @@ import { Address } from 'viem';
 
 import { chainSchema, parseChainId } from '@/utils/chains';
 
-import { getAll, getAbi, getSource, getDeployment } from './controller';
+import { getAll, getAbi, getSource, getDeployment, getImplementationAddress } from './controller';
 
 const router = new Hono()
   .get(
@@ -71,6 +71,27 @@ const router = new Hono()
       return c.json(abi);
     },
   )
+  .get(
+    '/implementation',
+    vValidator(
+      'query',
+      v.object({
+        address: v.string(),
+        chain: chainSchema,
+      }),
+    ),
+    async (c) => {
+      const { address, chain } = c.req.valid('query');
+      const chainId = parseChainId(chain);
+      const implementationAddress = await getImplementationAddress(
+        chainId,
+        address.toLowerCase() as Address,
+      );
+      return c.json({
+        address: implementationAddress,
+      });
+    },
+  )
   .get(
     '/deployment',
     vValidator(