fix parameter parsing bug for create connector input (#1210)

Signed-off-by: Yaliang Wu <[email protected]>

Author: ylwu-amzn

common/src/main/java/org/opensearch/ml/common/transport/connector/MLCreateConnectorInput.java

@@ -24,6 +24,7 @@
 import java.util.Map;
 
 import static org.opensearch.core.xcontent.XContentParserUtils.ensureExpectedToken;
+import static org.opensearch.ml.common.utils.StringUtils.getParameterMap;
 
 @Data
 public class MLCreateConnectorInput implements ToXContentObject, Writeable {
@@ -125,7 +126,7 @@ public static MLCreateConnectorInput parse(XContentParser parser) throws IOExcep
                     protocol = parser.text();
                     break;
                 case CONNECTOR_PARAMETERS_FIELD:
-                    parameters = parser.mapStrings();
+                    parameters = getParameterMap(parser.map());
                     break;
                 case CONNECTOR_CREDENTIAL_FIELD:
                     credential = parser.mapStrings();

common/src/test/java/org/opensearch/ml/common/transport/connector/MLCreateConnectorInputTests.java

@@ -163,6 +163,25 @@ public void testParse() throws Exception {
         });
     }
 
+    @Test
+    public void testParse_ArrayParameter() throws Exception {
+        String expectedInputStr = "{\"name\":\"test_connector_name\"," +
+                                  "\"description\":\"this is a test connector\",\"version\":\"1\",\"protocol\":\"http\"," +
+                                  "\"parameters\":{\"input\":[\"test input value\"]},\"credential\":{\"key\":\"test_key_value\"}," +
+                                  "\"actions\":[{\"action_type\":\"PREDICT\",\"method\":\"POST\",\"url\":\"https://test.com\"," +
+                                  "\"headers\":{\"api_key\":\"${credential.key}\"}," +
+                                  "\"request_body\":\"{\\\"input\\\": \\\"${parameters.input}\\\"}\"," +
+                                  "\"pre_process_function\":\"connector.pre_process.openai.embedding\"," +
+                                  "\"post_process_function\":\"connector.post_process.openai.embedding\"}]," +
+                                  "\"backend_roles\":[\"role1\",\"role2\"],\"add_all_backend_roles\":false," +
+                                  "\"access_mode\":\"PUBLIC\"}";
+        testParseFromJsonString(expectedInputStr, parsedInput -> {
+            assertEquals("test_connector_name", parsedInput.getName());
+            assertEquals(1, parsedInput.getParameters().size());
+            assertEquals("[\"test input value\"]", parsedInput.getParameters().get("input"));
+        });
+    }
+
     @Test
     public void testParseWithDryRun() throws Exception {
         String expectedInputStrWithDryRun = "{\"dry_run\":true}";