// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package com.cloud.api.response;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.log4j.Logger;
import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;
import org.apache.cloudstack.acl.RoleType;
import org.apache.cloudstack.api.ApiConstants;
import org.apache.cloudstack.api.BaseCmd;
import org.apache.cloudstack.api.ResponseObject;
import org.apache.cloudstack.api.response.AsyncJobResponse;
import org.apache.cloudstack.api.response.CreateCmdResponse;
import org.apache.cloudstack.api.response.ExceptionResponse;
import org.apache.cloudstack.api.response.ListResponse;
import org.apache.cloudstack.api.response.SuccessResponse;
import org.apache.cloudstack.context.CallContext;
import com.cloud.api.ApiDBUtils;
import com.cloud.api.ApiResponseGsonHelper;
import com.cloud.api.ApiServer;
import com.cloud.serializer.Param;
import com.cloud.user.Account;
import com.cloud.utils.encoding.URLEncoder;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.utils.exception.ExceptionProxyObject;
public class ApiResponseSerializer {
private static final Logger s_logger = Logger.getLogger(ApiResponseSerializer.class.getName());
public static String toSerializedString(ResponseObject result, String responseType) {
s_logger.trace("===Serializing Response===");
if (BaseCmd.RESPONSE_TYPE_JSON.equalsIgnoreCase(responseType)) {
return toJSONSerializedString(result);
} else {
return toXMLSerializedString(result);
}
}
private static final Pattern s_unicodeEscapePattern = Pattern.compile("\\\\u([0-9A-Fa-f]{4})");
public static String unescape(String escaped) {
String str = escaped;
Matcher matcher = s_unicodeEscapePattern.matcher(str);
while (matcher.find()) {
str = str.replaceAll("\\" + matcher.group(0), Character.toString((char)Integer.parseInt(matcher.group(1), 16)));
}
return str;
}
public static String toJSONSerializedString(ResponseObject result) {
if (result != null) {
Gson gson = ApiResponseGsonHelper.getBuilder().excludeFieldsWithModifiers(Modifier.TRANSIENT).create();
StringBuilder sb = new StringBuilder();
sb.append("{ \"").append(result.getResponseName()).append("\" : ");
if (result instanceof ListResponse) {
List<? extends ResponseObject> responses = ((ListResponse)result).getResponses();
Integer count = ((ListResponse)result).getCount();
boolean nonZeroCount = (count != null && count.longValue() != 0);
if (nonZeroCount) {
sb.append("{ \"").append(ApiConstants.COUNT).append("\":").append(count);
}
if ((responses != null) && !responses.isEmpty()) {
String jsonStr = gson.toJson(responses.get(0));
jsonStr = unescape(jsonStr);
if (nonZeroCount) {
sb.append(" ,\"").append(responses.get(0).getObjectName()).append("\" : [ ").append(jsonStr);
}
for (int i = 1; i < ((ListResponse)result).getResponses().size(); i++) {
jsonStr = gson.toJson(responses.get(i));
jsonStr = unescape(jsonStr);
sb.append(", ").append(jsonStr);
}
sb.append(" ] }");
} else {
if (!nonZeroCount) {
sb.append("{");
}
sb.append(" }");
}
} else if (result instanceof SuccessResponse) {
sb.append("{ \"success\" : \"").append(((SuccessResponse)result).getSuccess()).append("\"} ");
} else if (result instanceof ExceptionResponse) {
String jsonErrorText = gson.toJson(result);
jsonErrorText = unescape(jsonErrorText);
sb.append(jsonErrorText);
} else {
String jsonStr = gson.toJson(result);
if ((jsonStr != null) && !"".equals(jsonStr)) {
jsonStr = unescape(jsonStr);
if (result instanceof AsyncJobResponse || result instanceof CreateCmdResponse) {
sb.append(jsonStr);
} else {
sb.append(" { \"").append(result.getObjectName()).append("\" : ").append(jsonStr).append(" } ");
}
} else {
sb.append("{ }");
}
}
sb.append(" }");
return sb.toString();
}
return null;
}
private static String toXMLSerializedString(ResponseObject result) {
StringBuilder sb = new StringBuilder();
sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
sb.append("<").append(result.getResponseName()).append(" cloud-stack-version=\"").append(ApiDBUtils.getVersion()).append("\">");
if (result instanceof ListResponse) {
Integer count = ((ListResponse)result).getCount();
if (count != null && count != 0) {
sb.append("<").append(ApiConstants.COUNT).append(">").append(((ListResponse)result).getCount()).append("</").append(ApiConstants.COUNT).append(">");
}
List<? extends ResponseObject> responses = ((ListResponse)result).getResponses();
if ((responses != null) && !responses.isEmpty()) {
for (ResponseObject obj : responses) {
serializeResponseObjXML(sb, obj);
}
}
} else {
if (result instanceof CreateCmdResponse || result instanceof AsyncJobResponse) {
serializeResponseObjFieldsXML(sb, result);
} else {
serializeResponseObjXML(sb, result);
}
}
sb.append("</").append(result.getResponseName()).append(">");
return sb.toString();
}
private static void serializeResponseObjXML(StringBuilder sb, ResponseObject obj) {
if (!(obj instanceof SuccessResponse) && !(obj instanceof ExceptionResponse)) {
sb.append("<").append(obj.getObjectName()).append(">");
}
serializeResponseObjFieldsXML(sb, obj);
if (!(obj instanceof SuccessResponse) && !(obj instanceof ExceptionResponse)) {
sb.append("</").append(obj.getObjectName()).append(">");
}
}
public static Field[] getFlattenFields(Class<?> clz) {
List<Field> fields = new ArrayList<Field>();
fields.addAll(Arrays.asList(clz.getDeclaredFields()));
if (clz.getSuperclass() != null) {
fields.addAll(Arrays.asList(getFlattenFields(clz.getSuperclass())));
}
return fields.toArray(new Field[] {});
}
private static void serializeResponseObjFieldsXML(StringBuilder sb, ResponseObject obj) {
boolean isAsync = false;
if (obj instanceof AsyncJobResponse)
isAsync = true;
//Field[] fields = obj.getClass().getDeclaredFields();
Field[] fields = getFlattenFields(obj.getClass());
for (Field field : fields) {
if ((field.getModifiers() & Modifier.TRANSIENT) != 0) {
continue; // skip transient fields
}
SerializedName serializedName = field.getAnnotation(SerializedName.class);
if (serializedName == null) {
continue; // skip fields w/o serialized name
}
Param param = field.getAnnotation(Param.class);
if (param != null) {
RoleType[] allowedRoles = param.authorized();
if (allowedRoles.length > 0) {
boolean permittedParameter = false;
Account caller = CallContext.current().getCallingAccount();
for (RoleType allowedRole : allowedRoles) {
if (allowedRole.getValue() == caller.getType()) {
permittedParameter = true;
break;
}
}
if (!permittedParameter) {
s_logger.trace("Ignoring paremeter " + param.name() + " as the caller is not authorized to see it");
continue;
}
}
}
field.setAccessible(true);
Object fieldValue = null;
try {
fieldValue = field.get(obj);
} catch (IllegalArgumentException e) {
throw new CloudRuntimeException("how illegal is it?", e);
} catch (IllegalAccessException e) {
throw new CloudRuntimeException("come on...we set accessible already", e);
}
if (fieldValue != null) {
if (fieldValue instanceof ResponseObject) {
ResponseObject subObj = (ResponseObject)fieldValue;
if (isAsync) {
sb.append("<jobresult>");
}
serializeResponseObjXML(sb, subObj);
if (isAsync) {
sb.append("</jobresult>");
}
} else if (fieldValue instanceof Collection<?>) {
Collection<?> subResponseList = (Collection<?>)fieldValue;
boolean usedUuidList = false;
for (Object value : subResponseList) {
if (value instanceof ResponseObject) {
ResponseObject subObj = (ResponseObject)value;
if (serializedName != null) {
subObj.setObjectName(serializedName.value());
}
serializeResponseObjXML(sb, subObj);
} else if (value instanceof ExceptionProxyObject) {
// Only exception reponses carry a list of
// ExceptionProxyObject objects.
ExceptionProxyObject idProxy = (ExceptionProxyObject)value;
// If this is the first IdentityProxy field
// encountered, put in a uuidList tag.
if (!usedUuidList) {
sb.append("<" + serializedName.value() + ">");
usedUuidList = true;
}
sb.append("<" + "uuid" + ">" + idProxy.getUuid() + "</" + "uuid" + ">");
// Append the new descriptive property also.
String idFieldName = idProxy.getDescription();
if (idFieldName != null) {
sb.append("<" + "uuidProperty" + ">" + idFieldName + "</" + "uuidProperty" + ">");
}
} else if (value instanceof String) {
sb.append("<").append(serializedName.value()).append(">").append(value).append("</").append(serializedName.value()).append(">");
}
}
if (usedUuidList) {
// close the uuidList.
sb.append("</").append(serializedName.value()).append(">");
}
} else if (fieldValue instanceof Date) {
sb.append("<")
.append(serializedName.value())
.append(">")
.append(BaseCmd.getDateString((Date)fieldValue))
.append("</")
.append(serializedName.value())
.append(">");
} else {
String resultString = escapeSpecialXmlChars(fieldValue.toString());
if (!(obj instanceof ExceptionResponse)) {
resultString = encodeParam(resultString);
}
sb.append("<").append(serializedName.value()).append(">").append(resultString).append("</").append(serializedName.value()).append(">");
}
}
}
}
private static String escapeSpecialXmlChars(String originalString) {
char[] origChars = originalString.toCharArray();
StringBuilder resultString = new StringBuilder();
for (char singleChar : origChars) {
if (singleChar == '"') {
resultString.append(""");
} else if (singleChar == '\'') {
resultString.append("'");
} else if (singleChar == '<') {
resultString.append("<");
} else if (singleChar == '>') {
resultString.append(">");
} else if (singleChar == '&') {
resultString.append("&");
} else {
resultString.append(singleChar);
}
}
return resultString.toString();
}
private static String encodeParam(String value) {
if (!ApiServer.isEncodeApiResponse()) {
return value;
}
try {
return new URLEncoder().encode(value).replaceAll("\\+", "%20");
} catch (Exception e) {
s_logger.warn("Unable to encode: " + value, e);
}
return value;
}
}