feat(gateways): add REST APIs for calling gateways read interactions

src/router.ts

@@ -72,6 +72,44 @@
   blocklistMiddleware,
   contractRecordFilterHandler,
 );
+router.get(
+  // calls the read interaction handler with the function name set to gateways
+  `/v1/contract/:contractTxId${ARWEAVE_TX_ID_REGEX}/gateways`,
+  blocklistMiddleware,
+  async (ctx: KoaContext) => {
+    ctx.params.functionName = 'gateways';
+    await contractReadInteractionHandler(ctx);
+
+    // map the response to the expected format
+    const { result, ...restOfBody } = ctx.body as any;
+    ctx.body = {
+      ...restOfBody,
+      gateways: result,
+    };
+  },
+);
+router.get(
+  // calls the read interaction handler with the function name set to gateway and target set to the path param
+  `/v1/contract/:contractTxId${ARWEAVE_TX_ID_REGEX}/gateways/:address${ARWEAVE_TX_ID_REGEX}`,
+  blocklistMiddleware,
+  async (ctx: KoaContext) => {
+    ctx.params.functionName = 'gateway';
+    ctx.query = {
+      ...ctx.query,
+      target: ctx.params.address,
+    };
+    await contractReadInteractionHandler(ctx);
+
+    // map the response to the expected format
+    const { result, ...restOfBody } = ctx.body as any;
+    ctx.body = {
+      ...restOfBody,
+      gateway: {
+        [ctx.params.address]: result,
+      },
+    };
+  },
+);
 router.get(
   `/v1/contract/:contractTxId${ARWEAVE_TX_ID_REGEX}/balances/:address${ARWEAVE_TX_ID_REGEX}`,
   blocklistMiddleware,