fix(api): Fix connecting to AppSync from China with API category (#2948)

Author: mattcreaser

aws-api/src/main/java/com/amplifyframework/api/aws/DomainType.java

@@ -34,7 +34,7 @@ public enum DomainType {
     CUSTOM;
 
     private static final String STANDARD_ENDPOINT_REGEX =
-            "^https:\\/\\/\\w{26}\\.appsync\\-api\\.\\w{2}(?:(?:\\-\\w{2,})+)\\-\\d\\.amazonaws.com\\/graphql$";
+            "^https:\\/\\/\\w{26}\\.appsync\\-api\\.\\w{2}(?:\\-\\w{2,})+\\-\\d\\.amazonaws.com(?:\\.cn)?\\/graphql$";
 
     /**
      * Get Domain type based on defined endpoint.

aws-api/src/test/java/com/amplifyframework/api/aws/DomainTypeTest.java

@@ -24,6 +24,8 @@
 public class DomainTypeTest {
     private static final String STANDARD_URL =
             "https://abcdefghijklmnopqrstuvwxyz.appsync-api.us-west-2.amazonaws.com/graphql";
+    private static final String STANDARD_URL_CHINA =
+        "https://abcdefghijklmnopqrstuvwxyz.appsync-api.us-west-2.amazonaws.com.cn/graphql";
     private static final String CUSTOM_URL = "https://something.in.somedomain.com/graphql";
 
     /**
@@ -34,6 +36,14 @@ public void testStandardURLMatch() {
         Assert.assertEquals(STANDARD, DomainType.from(STANDARD_URL));
     }
 
+    /**
+     * Test that Domain type is {@link DomainType#STANDARD} for generated URL.
+     */
+    @Test
+    public void testStandardURLChinaMatch() {
+        Assert.assertEquals(STANDARD, DomainType.from(STANDARD_URL_CHINA));
+    }
+
     /**
      * Test that Domain type is set to {@link DomainType#CUSTOM} for custom URLs.
      */