refactor: extract shouldReAttachPrtForEstsHost() method

Move the 3-part condition (flight check + eSTS host check + PRT header
check) into a single method for readability in the handleUrl() chain.

Author: somalaya

common/src/main/java/com/microsoft/identity/common/internal/ui/webview/AzureActiveDirectoryWebViewClient.java

@@ -366,9 +366,7 @@ else if (isRedirectUrl(formattedURL)) {
             } else if (CommonFlightsManager.INSTANCE.getFlightsProvider().isFlightEnabled(CommonFlight.ENABLE_ATTACH_PRT_HEADER_WHEN_CROSS_CLOUD) && isCrossCloudRedirect(formattedURL)) {
                 Logger.info(methodTag,"Navigation contains cross cloud redirect.");
                 processCrossCloudRedirect(view, url);
-            } else if (CommonFlightsManager.INSTANCE.getFlightsProvider().isFlightEnabled(CommonFlight.ENABLE_PRT_HEADER_FOR_ESTS_HOST_REDIRECT)
-                    && isEstsCloudHost(url)
-                    && hasPrtHeaderAttached()) {
+            } else if (shouldReAttachPrtForEstsHost(url)) {
                 Logger.info(methodTag, "Navigation redirects to eSTS cloud host, re-attaching PRT header.");
                 processEstsHostRedirect(view, url);
             } else if (mInWebCpFlow && isWebCpEnrollmentUrl(url)) {
@@ -1175,6 +1173,18 @@ private boolean hasPrtHeaderAttached() {
                 && mRequestHeaders.containsKey(AuthenticationConstants.Broker.PRT_RESPONSE_HEADER);
     }
 
+    /**
+     * Returns true if PRT headers should be re-attached for an eSTS cloud host navigation.
+     * Checks that the flight is enabled, the URL is a known eSTS host, and PRT headers
+     * were present in the original request.
+     */
+    private boolean shouldReAttachPrtForEstsHost(@NonNull final String url) {
+        return CommonFlightsManager.INSTANCE.getFlightsProvider()
+                .isFlightEnabled(CommonFlight.ENABLE_PRT_HEADER_FOR_ESTS_HOST_REDIRECT)
+                && isEstsCloudHost(url)
+                && hasPrtHeaderAttached();
+    }
+
     /**
      * Processes an eSTS host redirect by generating a fresh PRT credential JWT and attaching it.
      */