add developer module

core/src/main/java/de/bstly/we/controller/support/JsonStringBodyControllerAdvice.java

@@ -7,19 +7,19 @@ import java.io.IOException;
 import java.lang.reflect.Type;
 
 import org.springframework.core.MethodParameter;
-import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpInputMessage;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.converter.HttpMessageConverter;
-import org.springframework.http.converter.StringHttpMessageConverter;
 import org.springframework.http.server.ServerHttpRequest;
 import org.springframework.http.server.ServerHttpResponse;
+import org.springframework.util.MimeType;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice;
 import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
 
-import com.google.gson.Gson;
-import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParser;
 
 /**
  * The Class JsonStringBodyControllerAdvice.
@@ -27,8 +27,6 @@ import com.google.gson.JsonPrimitive;
 @ControllerAdvice
 public class JsonStringBodyControllerAdvice implements RequestBodyAdvice, ResponseBodyAdvice<String> {
 
-	private Gson gson = new Gson();
-
 	/*
 	 * @see org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice#
 	 * supports(org.springframework.core.MethodParameter, java.lang.reflect.Type,
@@ -49,6 +47,11 @@ public class JsonStringBodyControllerAdvice implements RequestBodyAdvice, Respon
 	@Override
 	public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter, Type targetType,
 			Class<? extends HttpMessageConverter<?>> converterType) throws IOException {
+		if (inputMessage.getHeaders() == null || inputMessage.getHeaders().getContentType() == null || !inputMessage
+				.getHeaders().getContentType().equalsTypeAndSubtype(MimeType.valueOf("application/json"))) {
+			throw new EntityResponseStatusException(HttpStatus.UNSUPPORTED_MEDIA_TYPE);
+		}
+
 		return inputMessage;
 	}
 
@@ -84,7 +87,7 @@ public class JsonStringBodyControllerAdvice implements RequestBodyAdvice, Respon
 	 */
 	@Override
 	public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
-		return converterType == StringHttpMessageConverter.class;
+		return returnType.getParameterType() == String.class;
 	}
 
 	/*
@@ -99,8 +102,11 @@ public class JsonStringBodyControllerAdvice implements RequestBodyAdvice, Respon
 	public String beforeBodyWrite(String body, MethodParameter returnType, MediaType selectedContentType,
 			Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request,
 			ServerHttpResponse response) {
-		response.getHeaders().set(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
-		return gson.toJson(new JsonPrimitive(body));
+		if (body == null) {
+			return "";
+		}
+		JsonElement json = JsonParser.parseString(body);
+		return json.toString();
 	}
 
 }