From a7dda85451efb926664787006f8b6f2ff2497657 Mon Sep 17 00:00:00 2001
From: eerkaijun <kaijuneer@gmail.com>
Date: Fri, 19 Jan 2024 18:43:43 -0500
Subject: [PATCH] manage cors

---
 paymaster/package.json   |  2 ++
 paymaster/pnpm-lock.yaml | 33 +++++++++++++++++++++++++++++----
 paymaster/src/server.ts  |  4 ++++
 3 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/paymaster/package.json b/paymaster/package.json
index 36c8aa8..be7b30e 100644
--- a/paymaster/package.json
+++ b/paymaster/package.json
@@ -16,8 +16,10 @@
     "@types/body-parser": "^1.19.2",
     "@types/express": "^4.17.17",
     "@types/node": "^20.5.7",
+    "@types/cors": "^2.8.17",
     "axios": "^1.5.0",
     "body-parser": "^1.20.2",
+    "cors": "^2.8.5",
     "dotenv": "^16.3.1",
     "ethers": "^6.7.1",
     "express": "^4.18.2",
diff --git a/paymaster/pnpm-lock.yaml b/paymaster/pnpm-lock.yaml
index 1756074..eafc435 100644
--- a/paymaster/pnpm-lock.yaml
+++ b/paymaster/pnpm-lock.yaml
@@ -1,5 +1,9 @@
 lockfileVersion: '6.0'
 
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
 dependencies:
   '@ethersproject/bytes':
     specifier: ^5.7.0
@@ -7,6 +11,9 @@ dependencies:
   '@types/body-parser':
     specifier: ^1.19.2
     version: 1.19.2
+  '@types/cors':
+    specifier: ^2.8.17
+    version: 2.8.17
   '@types/express':
     specifier: ^4.17.17
     version: 4.17.17
@@ -19,6 +26,9 @@ dependencies:
   body-parser:
     specifier: ^1.20.2
     version: 1.20.2
+  cors:
+    specifier: ^2.8.5
+    version: 2.8.5
   dotenv:
     specifier: ^16.3.1
     version: 16.3.1
@@ -69,6 +79,12 @@ packages:
       '@types/node': 20.5.7
     dev: false
 
+  /@types/cors@2.8.17:
+    resolution: {integrity: sha512-8CGDvrBj1zgo2qE+oS3pOCyYNqCPryMWY2bGfwA0dcfopWGgxs+78df0Rs3rc9THP4JkOhLsAa+15VdpAqkcUA==}
+    dependencies:
+      '@types/node': 20.5.7
+    dev: false
+
   /@types/express-serve-static-core@4.17.36:
     resolution: {integrity: sha512-zbivROJ0ZqLAtMzgzIUC4oNqDG9iF0lSsAqpOD9kbs5xcIM3dTiyuHvBc7R8MtWBp3AAWGaovJa+wzWPjLYW7Q==}
     dependencies:
@@ -240,6 +256,14 @@ packages:
     engines: {node: '>= 0.6'}
     dev: false
 
+  /cors@2.8.5:
+    resolution: {integrity: sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==}
+    engines: {node: '>= 0.10'}
+    dependencies:
+      object-assign: 4.1.1
+      vary: 1.1.2
+    dev: false
+
   /debug@2.6.9:
     resolution: {integrity: sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==}
     peerDependencies:
@@ -490,6 +514,11 @@ packages:
     engines: {node: '>= 0.6'}
     dev: false
 
+  /object-assign@4.1.1:
+    resolution: {integrity: sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==}
+    engines: {node: '>=0.10.0'}
+    dev: false
+
   /object-inspect@1.12.3:
     resolution: {integrity: sha512-geUvdk7c+eizMNUDkRpW1wJwgfOiOeHbxBR/hLXK1aT6zmVSO0jsQcs7fj6MGw89jC/cjGfLcNOrtMYtGqm81g==}
     dev: false
@@ -662,7 +691,3 @@ packages:
       utf-8-validate:
         optional: true
     dev: false
-
-settings:
-  autoInstallPeers: true
-  excludeLinksFromLockfile: false
diff --git a/paymaster/src/server.ts b/paymaster/src/server.ts
index 32ac0fb..835f555 100644
--- a/paymaster/src/server.ts
+++ b/paymaster/src/server.ts
@@ -1,5 +1,6 @@
 import express, { Express, Request, Response } from 'express';
 import bodyParser from 'body-parser';
+import cors from 'cors';
 import { sponsorTransaction, UserOperation } from './rpcMethods';
 
 type JsonRpcRequestBody = {
@@ -13,6 +14,9 @@ const port = 3000;
 
 app.use(bodyParser.json());
 
+// Use cors middleware to enable CORS
+app.use(cors({ origin: '*' }));
+
 app.post('/', async(req: Request, res: Response) => {
     const { id, method, params } = req.body as JsonRpcRequestBody;