Added JsonErrorView

openid-connect-server/src/main/java/org/mitre/openid/connect/view/JsonErrorView.java

@@ -0,0 +1,82 @@
+package org.mitre.openid.connect.view;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.Map;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Component;
+import org.springframework.validation.BeanPropertyBindingResult;
+import org.springframework.web.servlet.view.AbstractView;
+
+import com.google.gson.ExclusionStrategy;
+import com.google.gson.FieldAttributes;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonObject;
+
+/**
+ * @author aanganes, jricher
+ *
+ */
+@Component("jsonEntityView")
+public class JsonErrorView extends AbstractView {
+
+	private static Logger logger = LoggerFactory.getLogger(JsonEntityView.class);
+
+	private Gson gson = new GsonBuilder()
+	    .setExclusionStrategies(new ExclusionStrategy() {
+	
+	        public boolean shouldSkipField(FieldAttributes f) {
+	
+	            return false;
+	        }
+	
+	        public boolean shouldSkipClass(Class<?> clazz) {
+	            // skip the JPA binding wrapper
+	            if (clazz.equals(BeanPropertyBindingResult.class)) {
+	                return true;
+	            }
+	            return false;
+	        }
+	
+	    })
+	    .serializeNulls()
+	    .setDateFormat("yyyy-MM-dd'T'HH:mm:ssZ")
+	    .create();
+
+	protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) {
+
+		response.setContentType("application/json");
+
+        
+		HttpStatus code = (HttpStatus) model.get("code");
+		if (code == null) {
+			code = HttpStatus.OK; // default to 200
+		}
+		
+		response.setStatus(code.value());
+		
+		try {
+			
+			Writer out = response.getWriter();
+			
+			String errorMessage = (String) model.get("errorMessage");
+			JsonObject obj = new JsonObject();
+			obj.addProperty("error_message", errorMessage);
+	        gson.toJson(obj, out);
+	        
+		} catch (IOException e) {
+			
+			//TODO: Error Handling
+			logger.error("IOException in JsonErrorView.java: ", e);
+			
+		}
+    }
+
+}