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import com.google.common.base.Strings;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import io.swagger.annotations.Api;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.framework.AopProxyUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.ApplicationContext;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
@Controller
@RequestMapping("/backdoor")
@Api(value = "/backdoor")
public class BackdoorController {
private static final Logger LOGGER = LoggerFactory.getLogger(BackdoorController.class);
@Value("${mgk.backdoor.enabled:false}")
private boolean enable;
@Autowired
private ApplicationContext applicationContext;
private static final Pattern BEAN_METHOD = Pattern.compile("([a-zA-Z0-9_$.]+)[.#]([a-zA-Z0-9_$]+)[（(](.*)[)）](\\d*)", Pattern.DOTALL);
@RequestMapping
public ResponseEntity home(@RequestParam(value = "expression", required = false)
String expression) throws Exception {
if (!enable) {
return ResponseEntity.ok().body("Forbidden!");
}
String page = "<!DOCTYPE html>\n" +
"<html lang='en'>\n" +
"<head>\n" +
" <meta charset='UTF-8'>\n" +
" <title>在线调试</title>\n" +
"</head>\n" +
"<body>\n" +
"\n" +
"<form method='post' action=''>\n" +
" <label>在线调试</label>\n" +
" <br/>\n" +
" <textarea rows='10' cols='120' name='expression' placeholder='" +
"用 Spring bean name 调用：userServiceImpl.findUser({id:123})\n" +
"用 IDEA 右键复制方法引用：com.ewing.UserServiceImpl#findUser({id:123})\n" +
"静态方法或new一个新对象调用：ewing.common.TimeUtils.getDaysOfMonth(2018,5)\n" +
"方法参数为去掉中括号的JSON数组，多个方法匹配则在表达式最后加数字指定调用哪个方法'>";
page += expression == null ? "" : expression.trim();
page += "</textarea>\n" +
" <br/>\n" +
" <input type='submit' value='调用方法' style='width:863px'/>\n" +
"</form>\n" +
"<br/>\n" +
"<textarea rows='20' cols='120' placeholder='调用返回的结果'>";
try {
if (StringUtils.hasText(expression)) {
page += methodExecute(expression);
}
} catch (Throwable throwable) {
Throwable cause = throwable;
while (throwable != null) {
cause = throwable;
throwable = cause.getCause();
}
page += "调用异常：" + cause.getMessage();
}
page += "</textarea>\n" +
"</body>\n" +
"</html>";
return ResponseEntity.ok()
.contentType(MediaType.valueOf("text/html;charset=UTF-8"))
.body(page);
}
private String methodExecute(String expression) {
Assert.isTrue(!Strings.isNullOrEmpty(expression), "表达式不能为空");
Matcher matcher = BEAN_METHOD.matcher(expression);
Assert.isTrue(matcher.matches(), "表达式格式不正确");
String classOrBeanName = matcher.group(1);
String methodName = matcher.group(2);
JsonArray arguments = getJsonArray("[" + matcher.group(3) + "]");
String indexGroup = matcher.group(4);
boolean hasIndexGroup = StringUtils.hasText(indexGroup);
int methodIndex = hasIndexGroup ? Integer.valueOf(indexGroup) : 0;
TargetInstance targetInstance = getTargetInstance(classOrBeanName);
List<TargetInvoker> targetInvokers = getTargetInvokers(targetInstance, methodName, arguments);
if (targetInvokers.size() > 1 && !hasIndexGroup) {
StringBuilder resultBuilder = new StringBuilder("请在输入表达式之后加以下数字来选择调用的方法：");
for (int i = 0; i < targetInvokers.size(); i++) {
resultBuilder.append('\n').append(i).append(':').append(targetInvokers.get(i).method);
}
return resultBuilder.toString();
}
Assert.isTrue(!CollectionUtils.isEmpty(targetInvokers), "找不到满足参数的方法：" + methodName);
Assert.isTrue(targetInvokers.size() >= methodIndex + 1, "没有第 " + methodIndex + " 个可调用的方法");
Object result = targetInvokers.get(methodIndex).invoke();
try {
return result instanceof String ? (String) result : GsonUtils.toJson(result);
} catch (Exception e) {
return String.valueOf(result);
}
}
private static class TargetInstance {
Object originTarget;
Object advisedTarget;
Class originTargetClass;
Class advisedTargetClass;
}
private List<TargetInvoker> getTargetInvokers(TargetInstance targetInstance, String methodName, JsonArray arguments) {
List<TargetInvoker> targetInvokers = new ArrayList<>();
if (targetInstance == null) {
return targetInvokers;
}
Object[] targets = {targetInstance.advisedTarget, targetInstance.originTarget};
Class[] classes = {targetInstance.advisedTargetClass, targetInstance.originTargetClass};
for (int i = 0; i < classes.length && targetInvokers.isEmpty(); i++) {
Class clazz = classes[i];
if (clazz == null) {
continue;
}
for (Method method : clazz.getDeclaredMethods()) {
if (!method.getName().equals(methodName)) {
continue;
}
Type[] types = method.getGenericParameterTypes();
if (types.length != arguments.size()) {
continue;
}
Iterator<JsonElement> elementIterator = arguments.iterator();
try {
List<Object> args = new ArrayList<>(types.length);
for (Type type : types) {
Object arg = GsonUtils.getGson().fromJson(elementIterator.next(), type);
args.add(arg);
}
TargetInvoker targetInvoker = new TargetInvoker();
targetInvoker.arguments = args;
targetInvoker.method = method;
targetInvoker.target = targets[i];
targetInvokers.add(targetInvoker);
} catch (Exception e) {
}
}
}
return targetInvokers;
}
private static class TargetInvoker {
Method method;
Object target;
List<Object> arguments;
Object invoke() {
Method methodPresent = Objects.requireNonNull(this.method, "方法不能为空");
Object invokeTarget = this.target;
try {
if (Modifier.isStatic(methodPresent.getModifiers())) {
invokeTarget = methodPresent.getDeclaringClass();
} else if (invokeTarget == null) {
invokeTarget = methodPresent.getDeclaringClass().newInstance();
}
Object targetPresent = Objects.requireNonNull(invokeTarget, "实例不能为空");
methodPresent.setAccessible(true);
Object result = arguments == null || arguments.isEmpty() ?
methodPresent.invoke(targetPresent) :
methodPresent.invoke(targetPresent, arguments.toArray());
return methodPresent.getReturnType().equals(Void.TYPE) ? "调用成功，该方法无返回值" : result;
} catch (ReflectiveOperationException e) {
LOGGER.error("调用方法失败", e);
throw new RuntimeException(e);
}
}
}
private TargetInstance getTargetInstance(String classOrBeanName) {
TargetInstance targetInstance = new TargetInstance();
try {
targetInstance.advisedTarget = applicationContext.getBean(classOrBeanName);
} catch (Exception e) {
LOGGER.info("Get spring bean name {} error: {}", classOrBeanName, e.getMessage());
}
if (targetInstance.advisedTarget == null) {
try {
targetInstance.advisedTarget = applicationContext.getBean(Class.forName(classOrBeanName));
} catch (Exception e) {
LOGGER.info("Get spring bean class {} error: {}", classOrBeanName, e.getMessage());
}
}
if (targetInstance.advisedTarget == null) {
try {
targetInstance.originTargetClass = Class.forName(classOrBeanName);
} catch (Exception e) {
throw new RuntimeException("找不到类：" + classOrBeanName);
}
} else {
targetInstance.advisedTargetClass = targetInstance.advisedTarget.getClass();
targetInstance.originTarget = AopProxyUtils.getSingletonTarget(targetInstance.advisedTarget);
targetInstance.originTargetClass = AopProxyUtils.ultimateTargetClass(targetInstance.advisedTarget);
}
return targetInstance;
}
private JsonArray getJsonArray(String jsonParams) {
try {
return GsonUtils.toObject(jsonParams, JsonArray.class);
} catch (Exception e) {
throw new RuntimeException("方法参数格式不正确");
}
}
static class GsonUtils{
private static final Gson gson = new GsonBuilder()
.setLenient()
.enableComplexMapKeySerialization()
.serializeNulls()
.setDateFormat("yyyy-MM-dd HH:mm:ss")
.disableHtmlEscaping()
.create();
private GsonUtils() {
}
public static Gson getGson() {
return gson;
}
public static String toJson(Object object) {
return gson.toJson(object);
}
public static <T> T toObject(String json, Class<T> type) {
return gson.fromJson(json, type);
}
}
}
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