fix: support request bodies in function urls

Author: blacha

src/__test__/examples.ts

@@ -1,4 +1,3 @@
-import 'source-map-support/register.js';
 import { ALBEvent, APIGatewayProxyEvent, CloudFrontRequestEvent } from 'aws-lambda';
 import { UrlEvent } from '../http/request.url';
 

src/__test__/url.test.ts

@@ -46,5 +46,17 @@ o.spec('FunctionUrl', () => {
     const req = new LambdaUrlRequest(UrlExample, fakeContext, fakeLog);
     o(req.path).equals('/v1/🦄/🌈/🦄.json');
     o(req.query.get('🦄')).equals('abc123');
+    o(req.body).equals(null);
+  });
+
+  o('should parse body', () => {
+    const newReq = clone(UrlExample);
+    newReq.body = JSON.stringify({ key: '🦄' });
+    newReq.headers['content-type'] = 'application/json';
+    newReq.requestContext.http.method = 'POST';
+
+    const req = new LambdaUrlRequest(newReq, fakeContext, fakeLog);
+    o(req.body).equals('{"key":"🦄"}');
+    o(req.json()).deepEquals({ key: '🦄' });
   });
 });

src/http/request.url.ts

@@ -9,6 +9,8 @@ export interface UrlEvent {
   routeKey: string;
 
   rawPath: string;
+  /** Body encoded as a string, this could be base64 encoded see isBase64Encoded */
+  body?: string;
   /** Query string without '?' @example "api=abc123" */
   rawQueryString: string;
   headers: Record<string, string>;
@@ -71,7 +73,8 @@ export class LambdaUrlRequest<T extends Record<string, string>> extends LambdaHt
   }
 
   get body(): string | null {
-    return null;
+    if (this.event.body == null) return null;
+    return this.event.body;
   }
 
   static is(x: unknown): x is UrlEvent {