feat: notifications on cronjob

packages/snap/snap.manifest.json

@@ -7,7 +7,7 @@
     "url": "https://github.com/MetaMask/template-snap-monorepo.git"
   },
   "source": {
-    "shasum": "KL959iQJVvwp0xM1PUNFrSDwgcfA2qdNrhSS/eeA80Q=",
+    "shasum": "Kb4jQY5ygvWh4OQ+MOltTrvZ5KcoW9o7+fiANG1oiTw=",
     "location": {
       "npm": {
         "filePath": "dist/bundle.js",
@@ -24,6 +24,16 @@
       "dapps": true,
       "snaps": false
     },
+    "endowment:cronjob": {
+      "jobs": [
+        {
+          "expression": "* * * * *",
+          "request": {
+            "method": "execute"
+          }
+        }
+      ]
+    },
     "endowment:transaction-insight": {
       "allowTransactionOrigin": true
     }

packages/snap/src/index.ts

@@ -1,6 +1,8 @@
 import { OnRpcRequestHandler } from '@metamask/snaps-types';
-import { panel, text } from '@metamask/snaps-ui';
+import { panel, text, heading } from '@metamask/snaps-ui';
 
+import { rpcErrors } from '@metamask/rpc-errors';
+import type { OnCronjobHandler } from '@metamask/snaps-types';
 /**
  * Handle incoming JSON-RPC requests, sent through `wallet_invokeSnap`.
  *
@@ -26,3 +28,36 @@ export const onRpcRequest: OnRpcRequestHandler = ({ origin, request }) => {
       throw new Error('Method not found.');
   }
 };
+
+
+/**
+ * Handle cronjob execution requests from MetaMask. This handler handles one
+ * method:
+ *
+ * - `execute`: The JSON-RPC method that is called by MetaMask when the cronjob
+ * is triggered. This method is specified in the snap manifest under the
+ * `endowment:cronjob` permission. If you want to support more methods (e.g.,
+ * with different times), you can add them to the manifest there.
+ *
+ * @param params - The request parameters.
+ * @param params.request - The JSON-RPC request object.
+ * @returns The JSON-RPC response.
+ * @see https://docs.metamask.io/snaps/reference/exports/#oncronjob
+ */
+
+
+export const onCronjob: OnCronjobHandler = async ({ request }) => {
+  switch (request.method) {
+    case 'execute':
+      return snap.request({
+        method: 'snap_notify',
+        params: {
+          type: 'native',
+          message: `Hello, world!`,
+        },
+      });
+
+    default:
+      throw new Error('Method not found.');
+  }
+};