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/*Copyright (C) 2020 THL A29 Limited, a Tencent company. All rights reserved.
This source code is licensed under the Apache License Version 2.0.*/
package apijson.orm;
import java.io.FileReader;
import java.lang.invoke.WrongMethodTypeException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.activation.UnsupportedDataTypeException;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.util.TypeUtils;
import apijson.Log;
import apijson.NotNull;
import apijson.RequestMethod;
import apijson.StringUtil;
/**可远程调用的函数类
* @author Lemon
*/
public class AbstractFunctionParser implements FunctionParser {
private static final String TAG = "AbstractFunctionParser";
/**是否解析参数 key 的对应的值，不用手动编码 curObj.getString(key)
*/
public static boolean IS_PARSE_ARG_VALUE = false;
/**开启支持远程函数
*/
public static boolean ENABLE_REMOTE_FUNCTION = true;
/**开启支持远程函数中的 JavaScript 脚本形式
*/
public static boolean ENABLE_SCRIPT_FUNCTION = true;
public static final int TYPE_REMOTE_FUNCTION = 0;
//public static final int TYPE_SQL_FUNCTION = 1;
public static final int TYPE_SCRIPT_FUNCTION = 1;
// <methodName, JSONObject>
// <isContain, <arguments:"array,key", tag:null, methods:null>>
public static Map<String, JSONObject> FUNCTION_MAP;
public static Map<String, JSONObject> SCRIPT_MAP;
static {
FUNCTION_MAP = new HashMap<>();
SCRIPT_MAP = new HashMap<>();
}
private RequestMethod method;
private String tag;
private int version;
private JSONObject request;
public AbstractFunctionParser() {
this(null, null, 0, null);
}
public AbstractFunctionParser(RequestMethod method, String tag, int version, @NotNull JSONObject request) {
setMethod(method == null ? RequestMethod.GET : method);
setTag(tag);
setVersion(version);
setRequest(request);
}
@Override
public RequestMethod getMethod() {
return method;
}
@Override
public AbstractFunctionParser setMethod(RequestMethod method) {
this.method = method;
return this;
}
@Override
public String getTag() {
return tag;
}
@Override
public AbstractFunctionParser setTag(String tag) {
this.tag = tag;
return this;
}
@Override
public int getVersion() {
return version;
}
@Override
public AbstractFunctionParser setVersion(int version) {
this.version = version;
return this;
}
private String key;
@Override
public String getKey() {
return key;
}
@Override
public AbstractFunctionParser setKey(String key) {
this.key = key;
return this;
}
private String parentPath;
@Override
public String getParentPath() {
return parentPath;
}
@Override
public AbstractFunctionParser setParentPath(String parentPath) {
this.parentPath = parentPath;
return this;
}
private String currentName;
@Override
public String getCurrentName() {
return currentName;
}
@Override
public AbstractFunctionParser setCurrentName(String currentName) {
this.currentName = currentName;
return this;
}
@NotNull
@Override
public JSONObject getRequest() {
return request;
}
@Override
public AbstractFunctionParser setRequest(@NotNull JSONObject request) {
this.request = request;
return this;
}
private JSONObject currentObject;
@NotNull
@Override
public JSONObject getCurrentObject() {
return currentObject;
}
@Override
public AbstractFunctionParser setCurrentObject(@NotNull JSONObject currentObject) {
this.currentObject = currentObject;
return this;
}
/**反射调用
* @param function 例如get(object,key)，参数只允许引用，不能直接传值
* @param currentObject 不作为第一个参数，就不能远程调用invoke，避免死循环
* @return {@link #invoke(String, JSONObject, boolean)}
*/
@Override
public Object invoke(@NotNull String function, @NotNull JSONObject currentObject) throws Exception {
return invoke(function, currentObject, false);
}
/**反射调用
* @param function 例如get(object,key)，参数只允许引用，不能直接传值
* @param currentObject 不作为第一个参数，就不能远程调用invoke，避免死循环
* @param containRaw 包含原始 SQL 片段
* @return {@link #invoke(AbstractFunctionParser, String, JSONObject, boolean)}
*/
@Override
public Object invoke(@NotNull String function, @NotNull JSONObject currentObject, boolean containRaw) throws Exception {
return invoke(this, function, currentObject, containRaw);
}
/**反射调用
* @param parser
* @param function 例如get(Map:map,key)，参数只允许引用，不能直接传值
* @param currentObject
* @return {@link #invoke(AbstractFunctionParser, String, Class[], Object[])}
*/
public static Object invoke(@NotNull AbstractFunctionParser parser, @NotNull String function, @NotNull JSONObject currentObject, boolean containRaw) throws Exception {
if (ENABLE_REMOTE_FUNCTION == false) {
throw new UnsupportedOperationException("AbstractFunctionParser.ENABLE_REMOTE_FUNCTION" +
" == false 时不支持远程函数！如需支持则设置 AbstractFunctionParser.ENABLE_REMOTE_FUNCTION = true ！");
}
FunctionBean fb = parseFunction(function, currentObject, false, containRaw);
JSONObject row = FUNCTION_MAP.get(fb.getMethod());
if (row == null) {
throw new UnsupportedOperationException("不允许调用远程函数 " + fb.getMethod() + " !");
}
int type = row.getIntValue("type");
if (type < TYPE_REMOTE_FUNCTION || type > TYPE_SCRIPT_FUNCTION) {
throw new UnsupportedOperationException("type = " + type + " 不合法！必须是 [0, 1] 中的一个 !");
}
if (ENABLE_SCRIPT_FUNCTION == false && type == TYPE_SCRIPT_FUNCTION) {
throw new UnsupportedOperationException("type = " + type + " 不合法！AbstractFunctionParser.ENABLE_SCRIPT_FUNCTION" +
" == false 时不支持远程函数中的脚本形式！如需支持则设置 AbstractFunctionParser.ENABLE_SCRIPT_FUNCTION = true ！");
}
int version = row.getIntValue("version");
if (parser.getVersion() < version) {
throw new UnsupportedOperationException("不允许 version = " + parser.getVersion() + " 的请求调用远程函数 " + fb.getMethod() + " ! 必须满足 version >= " + version + " !");
}
String tag = row.getString("tag"); // TODO 改为 tags，类似 methods 支持多个 tag。或者干脆不要？因为目前非开放请求全都只能后端指定
if (tag != null && tag.equals(parser.getTag()) == false) {
throw new UnsupportedOperationException("不允许 tag = " + parser.getTag() + " 的请求调用远程函数 " + fb.getMethod() + " ! 必须满足 tag = " + tag + " !");
}
String[] methods = StringUtil.split(row.getString("methods"));
List<String> ml = methods == null || methods.length <= 0 ? null : Arrays.asList(methods);
if (ml != null && ml.contains(parser.getMethod().toString()) == false) {
throw new UnsupportedOperationException("不允许 method = " + parser.getMethod() + " 的请求调用远程函数 " + fb.getMethod() + " ! 必须满足 method 在 " + Arrays.toString(methods) + "内 !");
}
try {
return invoke(parser, fb.getMethod(), fb.getTypes(), fb.getValues(), row.getString("returnType"), currentObject, type);
} catch (Exception e) {
if (e instanceof NoSuchMethodException) {
throw new IllegalArgumentException("字符 " + function + " 对应的远程函数 " + getFunction(fb.getMethod(), fb.getKeys()) + " 不在后端工程的DemoFunction内！"
+ "\n请检查函数名和参数数量是否与已定义的函数一致！"
+ "\n且必须为 function(key0,key1,...) 这种单函数格式！"
+ "\nfunction必须符合Java函数命名，key是用于在request内取值的键！"
+ "\n调用时不要有空格！" + (Log.DEBUG ? e.getMessage() : ""));
}
if (e instanceof InvocationTargetException) {
Throwable te = ((InvocationTargetException) e).getTargetException();
if (StringUtil.isEmpty(te.getMessage(), true) == false) { //到处把函数声明throws Exception改成throws Throwable挺麻烦
throw te instanceof Exception ? (Exception) te : new Exception(te.getMessage());
}
throw new IllegalArgumentException("字符 " + function + " 对应的远程函数传参类型错误！"
+ "\n请检查 key:value 中value的类型是否满足已定义的函数 " + getFunction(fb.getMethod(), fb.getKeys()) + " 的要求！"
+ (Log.DEBUG ? e.getMessage() : ""));
}
throw e;
}
}
/**反射调用
* @param parser
* @param methodName
* @param parameterTypes
* @param args
* @return {@link #invoke(AbstractFunctionParser, String, Class[], Object[], String, JSONObject, int)}
* @throws Exception
*/
public static Object invoke(@NotNull AbstractFunctionParser parser, @NotNull String methodName
, @NotNull Class<?>[] parameterTypes, @NotNull Object[] args) throws Exception {
return invoke(parser, methodName, parameterTypes, args, null, null, TYPE_REMOTE_FUNCTION);
}
/**反射调用
* @param parser
* @param methodName
* @param parameterTypes
* @param args
* @param returnType
* @param currentObject
* @param type
* @return
* @throws Exception
*/
public static Object invoke(@NotNull AbstractFunctionParser parser, @NotNull String methodName
, @NotNull Class<?>[] parameterTypes, @NotNull Object[] args, String returnType
, JSONObject currentObject, int type) throws Exception {
if (type == TYPE_SCRIPT_FUNCTION) {
return invokeScript(parser, methodName, parameterTypes, args, returnType, currentObject);
}
Method m = parser.getClass().getMethod(methodName, parameterTypes); // 不用判空，拿不到就会抛异常
if (Log.DEBUG) {
String rt = Log.DEBUG && m.getReturnType() != null ? m.getReturnType().getSimpleName() : null;
if ("void".equals(rt)) {
rt = null;
}
if ("void".equals(returnType)) {
returnType = null;
}
if (rt != returnType && (rt == null || rt.equals(returnType) == false)) {
throw new WrongMethodTypeException("远程函数 " + methodName + " 的实际返回值类型 " + rt + " 与 Function 表中的配置的 " + returnType + " 不匹配！");
}
}
return m.invoke(parser, args);
}
public static Invocable INVOCABLE;
public static ScriptEngine SCRIPT_ENGINE;
static {
try {
System.setProperty("Dnashorn.args", "language=es6");
System.setProperty("Dnashorn.args", "--language=es6");
System.setProperty("-Dnashorn.args", "--language=es6");
/*获取执行JavaScript的执行引擎*/
SCRIPT_ENGINE = new ScriptEngineManager().getEngineByName("javascript");
INVOCABLE = (Invocable) SCRIPT_ENGINE;
}
catch (Exception e) {
e.printStackTrace();
}
}
/**Java 调用 JavaScript 函数
* @param parser
* @param methodName
* @param parameterTypes
* @param args
* @param returnType
* @param currentObject
* @return
* @throws Exception
*/
public static Object invokeScript(@NotNull AbstractFunctionParser parser, @NotNull String methodName
, @NotNull Class<?>[] parameterTypes, @NotNull Object[] args, String returnType, JSONObject currentObject) throws Exception {
JSONObject row = SCRIPT_MAP.get(methodName);
if (row == null) {
throw new UnsupportedOperationException("调用远程函数脚本 " + methodName + " 不存在!");
}
String script = row.getString("script");
SCRIPT_ENGINE.eval(script); // 必要，未执行导致下方 INVOCABLE.invokeFunction 报错 NoSuchMethod
//Object[] newArgs = args == null || args.length <= 0 ? null : new Object[args.length];
// APIJSON 远程函数不应该支持
//if (row.getBooleanValue("simple")) {
// return SCRIPT_ENGINE.eval(script);
//}
Object result;
if (args == null || args.length <= 0) {
result = INVOCABLE.invokeFunction(methodName);
}
else {
//args[0] = JSON.toJSONString(args[0]); // Java 调 js 函数只支持传基本类型，改用 invokeMethod ？
//for (int i = 0; i < args.length; i++) {
// Object a = currentObject == null ? null : currentObject.get(args[i]);
// newArgs[i] = a == null || apijson.JSON.isBooleanOrNumberOrString(a) ? a : JSON.toJSONString(a);
//}
// 支持 JSONObject
result = INVOCABLE.invokeFunction(methodName, args);
//result = INVOCABLE.invokeMethod(args[0], methodName, args);
//switch (newArgs.length) {
// case 1:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0]);
// break;
// case 2:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1]);
// break;
// case 3:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1], newArgs[2]);
// break;
// case 4:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1], newArgs[2], newArgs[3]);
// break;
// case 5:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1], newArgs[2], newArgs[3], newArgs[4]);
// break;
// case 6:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1], newArgs[2], newArgs[3], newArgs[4], newArgs[5]);
// break;
// case 7:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1], newArgs[2], newArgs[3], newArgs[4], newArgs[5], newArgs[6]);
// break;
// case 8:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1], newArgs[2], newArgs[3], newArgs[4], newArgs[5], newArgs[6], newArgs[7]);
// break;
// case 9:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1], newArgs[2], newArgs[3], newArgs[4], newArgs[5], newArgs[6], newArgs[7], newArgs[8]);
// break;
// case 10:
// result = INVOCABLE.invokeFunction(methodName, newArgs[0], newArgs[1], newArgs[2], newArgs[3], newArgs[4], newArgs[5], newArgs[6], newArgs[7], newArgs[8], newArgs[9]);
// break;
//}
}
if (Log.DEBUG && result != null) {
Class<?> rt = result.getClass(); // 作为远程函数的 js 类型应该只有 JSON 的几种类型
String fullReturnType = (StringUtil.isSmallName(returnType)
? returnType : (returnType.startsWith("JSON") ? "com.alibaba.fastjson." : "java.lang.") + returnType);
if ((rt == null && returnType != null) || (rt != null && returnType == null)) {
throw new WrongMethodTypeException("远程函数 " + methodName + " 的实际返回值类型 "
+ (rt == null ? null : rt.getName()) + " 与 Function 表中的配置的 " + fullReturnType + " 不匹配！");
}
Class<?> cls;
try {
cls = Class.forName(fullReturnType);
}
catch (Exception e) {
throw new WrongMethodTypeException("远程函数 " + methodName + " 在 Function 表中的配置的类型 "
+ returnType + " 对应的 " + fullReturnType + " 错误！在 Java 中 Class.forName 找不到这个类型！");
}
if (cls.isAssignableFrom(rt) == false) {
throw new WrongMethodTypeException("远程函数 " + methodName + " 的实际返回值类型 "
+ (rt == null ? null : rt.getName()) + " 与 Function 表中的配置的 "
+ returnType + " 对应的 " + fullReturnType + " 不匹配！");
}
}
Log.d(TAG, "invokeScript " + methodName + "(..) >> result = " + result);
return result;
}
/**解析函数
* @param function
* @param request
* @param isSQLFunction
* @return
* @throws Exception
*/
@NotNull
public static FunctionBean parseFunction(@NotNull String function, @NotNull JSONObject request, boolean isSQLFunction) throws Exception {
return parseFunction(function, request, isSQLFunction, false);
}
/**解析函数，自动解析的值类型只支持 Boolean, Number, String, Map, List
* @param function
* @param request
* @param isSQLFunction
* @param containRaw
* @return
* @throws Exception
*/
public static FunctionBean parseFunction(@NotNull String function, @NotNull JSONObject request, boolean isSQLFunction, boolean containRaw) throws Exception {
int start = function.indexOf("(");
int end = function.lastIndexOf(")");
String method = (start <= 0 || end != function.length() - 1) ? null : function.substring(0, start);
if (StringUtil.isEmpty(method, true)) {
throw new IllegalArgumentException("字符 " + function + " 不合法！函数的名称 function 不能为空，"
+ "且必须为 function(key0,key1,...) 这种单函数格式！"
+ "\nfunction必须符合 " + (isSQLFunction ? "SQL 函数/SQL 存储过程" : "Java 函数") + " 命名，key 是用于在 request 内取值的键！");
}
String[] keys = StringUtil.split(function.substring(start + 1, end));
int length = keys == null ? 0 : keys.length;
Class<?>[] types;
Object[] values;
if (isSQLFunction || IS_PARSE_ARG_VALUE) {
types = new Class<?>[length];
values = new Object[length];
//碰到null就挂了！！！Number还得各种转换不灵活！不如直接传request和对应的key到函数里，函数内实现时自己 getLongValue,getJSONObject ...
Object v;
for (int i = 0; i < length; i++) {
v = values[i] = getArgValue(request, keys[i], containRaw); // request.get(keys[i]);
if (v == null) {
types[i] = Object.class;
values[i] = null;
break;
}
if (v instanceof Boolean) {
types[i] = Boolean.class; //只支持JSON的几种类型
} // 怎么都有 bug，如果是引用的值，很多情况下无法指定 // 用 1L 指定为 Long ？ 其它的默认按长度分配为 Integer 或 Long？
//else if (v instanceof Long || v instanceof Integer || v instanceof Short) {
// types[i] = Long.class;
//}
else if (v instanceof Number) {
types[i] = Number.class;
}
else if (v instanceof String) {
types[i] = String.class;
}
else if (v instanceof Map) { // 泛型兼容？ // JSONObject
types[i] = Map.class;
//性能比较差
//values[i] = TypeUtils.cast(v, Map.class, ParserConfig.getGlobalInstance());
}
else if (v instanceof Collection) { // 泛型兼容？ // JSONArray
types[i] = List.class;
//性能比较差
values[i] = TypeUtils.cast(v, List.class, ParserConfig.getGlobalInstance());
}
else {
throw new UnsupportedDataTypeException(keys[i] + ":value 中value不合法！远程函数 key():"
+ function + " 中的 arg 对应的值类型只能是 [Boolean, Number, String, JSONObject, JSONArray] 中的一种！");
}
}
}
else {
types = new Class<?>[length + 1];
types[0] = JSONObject.class;
values = new Object[length + 1];
values[0] = request;
for (int i = 0; i < length; i++) {
types[i + 1] = String.class;
values[i + 1] = keys[i];
}
}
FunctionBean fb = new FunctionBean();
fb.setFunction(function);
fb.setMethod(method);
fb.setKeys(keys);
fb.setTypes(types);
fb.setValues(values);
return fb;
}
/**
* @param method
* @param keys
* @return
*/
public static String getFunction(String method, String[] keys) {
String f = method + "(JSONObject request";
if (keys != null) {
for (int i = 0; i < keys.length; i++) {
f += (", String " + keys[i]);
}
}
f += ")";
return f;
}
public static <T> T getArgValue(@NotNull JSONObject currentObject, String keyOrValue) {
return getArgValue(currentObject, keyOrValue, false);
}
public static <T> T getArgValue(@NotNull JSONObject currentObject, String keyOrValue, boolean containRaw) {
if (keyOrValue == null) {
return null;
}
if (keyOrValue.endsWith("`") && keyOrValue.lastIndexOf("`") == 0) {
return (T) currentObject.get(keyOrValue.substring(1, keyOrValue.length() - 1));
}
if (keyOrValue.endsWith("'") && keyOrValue.lastIndexOf("'") == 0) {
return (T) keyOrValue.substring(1, keyOrValue.length() - 1);
}
if (StringUtil.isName(keyOrValue.startsWith("@") ? keyOrValue.substring(1) : keyOrValue)) {
return (T) currentObject.get(keyOrValue);
}
// 传参加上 @raw:"key()" 避免意外情况
Object val = containRaw ? AbstractSQLConfig.RAW_MAP.get(keyOrValue) : null;
if (val != null) {
return (T) ("".equals(val) ? keyOrValue : val);
}
try {
val = JSON.parse(keyOrValue);
if (apijson.JSON.isBooleanOrNumberOrString(val)) {
return (T) val;
}
}
catch (Throwable e) {
Log.d(TAG, "getArgValue try {\n" +
" Object val = JSON.parse(keyOrValue);" +
"} catch (Throwable e) = " + e.getMessage());
}
return (T) currentObject.get(keyOrValue);
}
public static class FunctionBean {
private String function;
private String method;
private String[] keys;
private Class<?>[] types;
private Object[] values;
public String getFunction() {
return function;
}
public void setFunction(String function) {
this.function = function;
}
public String getMethod() {
return method;
}
public void setMethod(String method) {
this.method = method;
}
public String[] getKeys() {
return keys;
}
public void setKeys(String[] keys) {
this.keys = keys;
}
public Class<?>[] getTypes() {
return types;
}
public void setTypes(Class<?>[] types) {
this.types = types;
}
public Object[] getValues() {
return values;
}
public void setValues(Object[] values) {
this.values = values;
}
/**
* @param useValue
* @return
*/
public String toFunctionCallString(boolean useValue) {
return toFunctionCallString(useValue, null);
}
/**
* @param useValue
* @param quote
* @return
*/
public String toFunctionCallString(boolean useValue, String quote) {
String s = getMethod() + "(";
Object[] args = useValue ? getValues() : getKeys();
if (args != null && args.length > 0) {
if (quote == null) {
quote = "'";
}
Object arg;
for (int i = 0; i < args.length; i++) {
arg = args[i];
s += (i <= 0 ? "" : ",") + (arg instanceof Boolean || arg instanceof Number ? arg : quote + arg + quote);
}
}
return s + ")";
}
}
}