chore(commons): update Powertools UA middleware detection (#1762)

* chore(commons): fix double ua detection

* chore(commons): fix unit test

Author: dreamorosi

Diff for: packages/commons/src/awsSdk/userAgentMiddleware.ts

@@ -30,14 +30,25 @@ const customUserAgentMiddleware = (feature: string) => {
     };
 };
 
+/**
+ * @internal
+ * Checks if the middleware stack already has the Powertools UA middleware
+ */
+const hasPowertools = (middlewareStack: string[]): boolean => {
+  let found = false;
+  for (const middleware of middlewareStack) {
+    if (middleware.includes('addPowertoolsToUserAgent')) {
+      found = true;
+    }
+  }
+
+  return found;
+};
+
 const addUserAgentMiddleware = (client: unknown, feature: string): void => {
   try {
     if (isSdkClient(client)) {
-      if (
-        client.middlewareStack
-          .identify()
-          .includes('addPowertoolsToUserAgent: POWERTOOLS,USER_AGENT')
-      ) {
+      if (hasPowertools(client.middlewareStack.identify())) {
         return;
       }
       client.middlewareStack.addRelativeTo(
@@ -49,8 +60,8 @@ const addUserAgentMiddleware = (client: unknown, feature: string): void => {
         `The client provided does not match the expected interface`
       );
     }
-  } catch (e) {
-    console.warn('Failed to add user agent middleware', e);
+  } catch (error) {
+    console.warn('Failed to add user agent middleware', error);
   }
 };
 

Diff for: packages/commons/tests/unit/awsSdk.test.ts

@@ -30,7 +30,9 @@ describe('Helpers: awsSdk', () => {
       // Prepare
       const client = {
         middlewareStack: {
-          identify: () => 'addPowertoolsToUserAgent: POWERTOOLS,USER_AGENT',
+          identify: () => [
+            'addPowertoolsToUserAgent: after getUserAgentMiddleware',
+          ],
           addRelativeTo: jest.fn(),
         },
         send: jest.fn(),