fix: Allow already-parsed body objects (#35)

Fixes a regression introduced in #28.
If the body is already parsed and it's a valid POST request, we can just return it.

Co-authored-by: Trevor Scheer <[email protected]>

Author: alex-bartolo

.changeset/itchy-icons-flash.md

@@ -0,0 +1,9 @@
+---
+'@as-integrations/azure-functions': patch
+---
+
+Fix a regression w.r.t body parsing introduced in https://github.com/apollo-server-integrations/apollo-server-integration-azure-functions/pull/28.
+
+Bodies which are already parsed object should just be returned outright rather than treated as invalid.
+
+This issue manifests for users as an invalid POST request from Apollo Server.

src/index.ts

@@ -90,12 +90,17 @@ function parseBody(
   contentType: string | undefined,
 ): object | null {
   const isValidContentType = contentType?.startsWith('application/json');
-  const isValidPostRequest =
-    method === 'POST' && typeof body === 'string' && isValidContentType;
+  const isValidPostRequest = method === 'POST' && isValidContentType;
 
   if (isValidPostRequest) {
-    return JSON.parse(body);
+    if (typeof body === 'string') {
+      return JSON.parse(body);
+    }
+    if (typeof body === 'object') {
+      return body;
+    }
   }
+
   return null;
 }