fix(apollo): Fix using Apollo to connect to AppSync in China (#2947)

Author: mattcreaser

apollo/apollo-appsync/src/main/java/com/amplifyframework/apollo/appsync/AppSyncEndpoint.kt

@@ -21,7 +21,7 @@ import java.net.URL
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 
 private val standardEndpointRegex =
-    "^https://\\w{26}\\.appsync-api\\.\\w{2}(?:-\\w{2,})+-\\d\\.amazonaws.com/graphql$".toRegex()
+    "^https://\\w{26}\\.appsync-api\\.\\w{2}(?:-\\w{2,})+-\\d\\.amazonaws.com(?:\\.cn)?/graphql$".toRegex()
 
 /**
  * Class representing the AppSync endpoint. There are multiple URLs associated with each AppSync endpoint: the

apollo/apollo-appsync/src/test/java/com/amplifyframework/apollo/appsync/AppSyncEndpointTest.kt

@@ -26,6 +26,8 @@ import org.junit.Test
 
 class AppSyncEndpointTest {
     private val standardAppSyncUrl = "https://example1234567890123456789.appsync-api.us-east-1.amazonaws.com/graphql"
+    private val standardAppSyncUrlChina =
+        "https://example1234567890123456789.appsync-api.us-east-1.amazonaws.com.cn/graphql"
     private val customAppSyncUrl = "https://api.example.com/graphql"
 
     @Test
@@ -48,6 +50,13 @@ class AppSyncEndpointTest {
             "https://example1234567890123456789.appsync-realtime-api.us-east-1.amazonaws.com/graphql/connect"
     }
 
+    @Test
+    fun `uses expected realtime URL for standard endpoint in China`() {
+        val endpoint = AppSyncEndpoint(standardAppSyncUrlChina)
+        endpoint.websocketConnection.toString() shouldBe
+            "https://example1234567890123456789.appsync-realtime-api.us-east-1.amazonaws.com.cn/graphql/connect"
+    }
+
     @Test
     fun `uses expected realtime URL for custom endpoint`() {
         val endpoint = AppSyncEndpoint(customAppSyncUrl)