feat(lambda-edge): add getConnInfo helper for Lambda@Edge (#3099)

* add conninfo helper for lambda@edge

* export getConnInfo

src/adapter/lambda-edge/conninfo.test.ts

@@ -0,0 +1,27 @@
+import { Context } from '../../context'
+import type { CloudFrontEdgeEvent } from './handler'
+import { getConnInfo } from './conninfo'
+
+describe('getConnInfo', () => {
+  it('Should info is valid', () => {
+    const clientIp = Math.random().toString()
+    const env = {
+      event: {
+        Records: [
+          {
+            cf: {
+              request: {
+                clientIp,
+              },
+            },
+          },
+        ],
+      } as CloudFrontEdgeEvent,
+    }
+
+    const c = new Context(new Request('http://localhost/'), { env })
+    const info = getConnInfo(c)
+
+    expect(info.remote.address).toBe(clientIp)
+  })
+})

src/adapter/lambda-edge/conninfo.ts

@@ -0,0 +1,15 @@
+import type { GetConnInfo } from '../../helper/conninfo'
+import type { CloudFrontEdgeEvent } from './handler'
+import type { Context } from '../../context'
+
+type Env = {
+  Bindings: {
+    event: CloudFrontEdgeEvent
+  }
+}
+
+export const getConnInfo: GetConnInfo = (c: Context<Env>) => ({
+  remote: {
+    address: c.env.event.Records[0].cf.request.clientIp,
+  },
+})

src/adapter/lambda-edge/index.ts

@@ -4,6 +4,7 @@
  */
 
 export { handle } from './handler'
+export { getConnInfo } from './conninfo'
 export type {
   Callback,
   CloudFrontConfig,