通用js函数

此处整理Frida的js中，通用的js方面的函数：

• 常用写法：
  • 判断key是否在字典dict中

      curKey in someDict
    

对象=Object: Dict/List/...

toJsonStr：转换成JSON字符串（用于打印js对象）

// convert Object(dict/list/...) to JSON string
function toJsonStr(curObj, singleLine=false, space=2){
  // console.log("toJsonStr: singleLine=" + singleLine)
  // var jsonStr = JSON.stringify(curObj, null, 2)
  var jsonStr = JSON.stringify(curObj, null, space)
  if(singleLine) {
    // jsonStr = jsonStr.replace(/\\n/g, '')
    jsonStr = jsonStr.replace(/\n/g, '')
  }
  return jsonStr
  // return curObj.toString()
}

用法举例：

console.log("Add: address=" + address + ", moduleInfoDict=" + toJsonStr(moduleInfoDict) + " into cache gAddrToModuleInfoDict")

输出：

[*] Add: address=0x1098ad910, moduleInfoDict={
  "fileName": "/private/var/containers/Bundle/Application/02BED373-87F5-4B48-9F4B-70E853B20267/WhatsApp.app/Frameworks/SharedModules.framework/SharedModules",
  "fileAddress": "0x108c84000",
  "symbolName": "WAGetWCIHttpImpl",
  "symbolAddress": "0x1098abad0"
} into cache gAddrToModuleInfoDict

String字符串

occurrences：字符串搜索

/** Function that count occurrences of a substring in a string;
 * @param {String} string               The string
 * @param {String} subString            The sub string to search for
 * @param {Boolean} [allowOverlapping]  Optional. (Default:false)
 *
 * @author Vitim.us https://gist.github.com/victornpb/7736865
 * @see Unit Test https://jsfiddle.net/Victornpb/5axuh96u/
 * @see https://stackoverflow.com/a/7924240/938822
 * @example occurrences("- setExportedObject:", ":") => 1
 */
function occurrences(string, subString, allowOverlapping) {
    // console.log("string=" + string + ",subString=" + subString + ", allowOverlapping=" + allowOverlapping)
    string += "";
    subString += "";
    if (subString.length <= 0) return (string.length + 1);

    var n = 0,
        pos = 0,
        step = allowOverlapping ? 1 : subString.length;

    while (true) {
        pos = string.indexOf(subString, pos);
        // console.log("pos=" + pos)
        if (pos >= 0) {
            ++n;
            pos += step;
        } else break;
    }

    return n;
}

用法举例：

const argSel = args[1];
console.log("argSel: ", argSel);
const argSelStr = ObjC.selectorAsString(argSel);
console.log("argSelStr: ", argSelStr);

const argCount = occurrences(argSelStr, ":");
console.log("argCount: ", argCount);

输出：

argSel:  0x19cf48d27
argSelStr:  fileURLWithPath:isDirectory:
argCount:  2

含义：

（iOS的ObjC中的SEL）字符串：fileURLWithPath:isDirectory: 中有2个冒号:

String - Log日志

// Generate single line log string
// input: logStr="Called: -[NSURLRequest initWithURL:]"
// output: "=============================== Called: -[NSURLRequest initWithURL:] ==============================="
// function generateLineStr(logStr, isWithSpace=true, paddingChar="=", lineWidth=80){
function generateLineStr(logStr, isWithSpace=true, paddingChar="=", lineWidth=100){
// function generateLineStr(logStr, isWithSpace=true, paddingChar="=", lineWidth=120){
    // console.log("logStr=" + logStr, ", isWithSpace=" + isWithSpace + ", paddingChar=" + paddingChar + ", lineWidth=" + lineWidth)
    var lineStr = ""

    var realLogStr = ""
    if (isWithSpace) {
        realLogStr = " " + logStr + " "
    } else {
        realLogStr = logStr
    }

    var realLogStrLen = realLogStr.length
    if ((realLogStrLen % 2) > 0){
        realLogStr += " "
        realLogStrLen = realLogStr.length
    }

    var leftRightPaddingStr = ""
    var paddingLen = lineWidth - realLogStrLen
    if (paddingLen > 0) {
        var leftRightPaddingLen = paddingLen / 2
        leftRightPaddingStr = times(paddingChar, leftRightPaddingLen)
    }

    lineStr = leftRightPaddingStr + realLogStr + leftRightPaddingStr

    // console.log("lineStr:\n" + lineStr)
    return lineStr
}

用法举例：

var logStr="Called: -[NSURLRequest initWithURL:]"
generateLineStr(logStr)

输出：

=============================== Called: -[NSURLRequest initWithURL:] ===============================

其他输出举例：

=========== Called: +[WARegistrationURLBuilder preChatdABPropURLWithPhoneNumber:abHash:] ===========

============================= Called: +[NSURLRequest requestWithURL:]  =============================

times：字符串相乘

代码：

// String multiple
// eg: str="=", num=5 => "====="
function times(str, num){
    return new Array(num + 1).join(str)
}

用法举例：

var paddingChar = "-"
var leftRightPaddingLen = 10
var leftRightPaddingStr = times(paddingChar, leftRightPaddingLen)
console.log(leftRightPaddingStr)

输出：

----------

List列表

isItemInList：判断元素是否在列表中

// check whether is item inside the list
// eg: curItem="abc", curList=["abc", "def"] => true
function isItemInList(curItem, curList){
    // method1:
    return curList.includes(curItem)
    // // method2:
    // return curList.indexOf(curItem) > -1
}

用法举例：

var iOSObjCallStr = "+[NSURLRequest requestWithURL:]"
let cfgPrintOnceStackExceptionList = [
    "+[NSURLRequest requestWithURL:]",
]

console.log(isItemInList(iOSObjCallStr, cfgPrintOnceStackExceptionList)))

输出：

true