tynder/bin/lib/protection.js

TypeScript friendly Data validator for JavaScript.

"use strict";
// Copyright (c) 2020 Shellyl_N and Authors
// license: ISC
// https://github.com/shellyln
var _a;
Object.defineProperty(exports, "__esModule", { value: true });
exports.isUnsafeVarNames = exports.funConstructor = exports.objConstructor = exports.globalObj = exports.dummyTargetObject = void 0;
// tslint:disable: no-shadowed-variable
// tslint:disable: function-constructor
exports.dummyTargetObject = {};
// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
_a = (() => {
    var _a, _b;
    let globalObj = null;
    try {
        // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment, @typescript-eslint/no-implied-eval
        globalObj = Function('return this')();
    }
    catch (e) {
        // Nothing to do.
    }
    if (!globalObj) {
        // Fall back (for CSP, etc...)
        if (typeof window === 'object' && window) {
            globalObj = window;
        }
        else if (typeof global === 'object' && global) {
            globalObj = global;
        }
        else if (typeof globalThis === 'object' && globalThis) {
            globalObj = globalThis;
        }
        else {
            globalObj = exports.dummyTargetObject;
        }
    }
    // NOTE: ({}).constructor === Object
    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
    let objConstructor = null;
    try {
        // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
        objConstructor = ((_a = ({}).constructor) !== null && _a !== void 0 ? _a : Object);
    }
    catch (e) {
        // Nothing to do.
    }
    if (!objConstructor) {
        // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
        objConstructor = exports.dummyTargetObject;
    }
    // NOTE: ({}).toString.constructor === Function
    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
    let funConstructor = null;
    try {
        // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
        funConstructor = ((_b = ({}).toString.constructor) !== null && _b !== void 0 ? _b : Function);
    }
    catch (e) {
        // Nothing to do.
    }
    if (!funConstructor) {
        // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
        funConstructor = exports.dummyTargetObject;
    }
    return ({
        // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
        g: globalObj, o: objConstructor, f: funConstructor
    });
})(), exports.globalObj = _a.g, exports.objConstructor = _a.o, exports.funConstructor = _a.f;
// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
function isUnsafeVarNames(target, varName) {
    if (target === exports.globalObj ||
        varName === '__proto__' ||
        varName === '__defineGetter__' || varName === '__defineSetter__' ||
        varName === '__lookupGetter__' || varName === '__lookupSetter__') {
        return true;
    }
    if (varName === 'prototype' || varName === 'constructor') {
        if (target === null || target === void 0 || typeof target === 'function') {
            return true;
        }
    }
    if (target === null || target === void 0 || target === exports.objConstructor) {
        if (Object.prototype.hasOwnProperty.call(exports.objConstructor, varName)) {
            return true;
        }
    }
    if (target === null || target === void 0 || target === exports.funConstructor) {
        // checking 'call', 'arguments', 'caller', ...
        let con = exports.funConstructor;
        while (con) {
            // eslint-disable-next-line @typescript-eslint/no-unsafe-call, @typescript-eslint/no-unsafe-member-access
            if (Object.prototype.hasOwnProperty.call(con, varName)) {
                return true;
            }
            // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment, @typescript-eslint/no-unsafe-member-access
            con = con.__proto__;
        }
    }
    if (typeof target === 'function') {
        // eslint-disable-next-line @typescript-eslint/no-unsafe-call, @typescript-eslint/no-unsafe-member-access
        if (!Object.prototype.hasOwnProperty.call(target, varName)) {
            // function's prototypes' members
            return true;
        }
    }
    return false;
}
exports.isUnsafeVarNames = isUnsafeVarNames;
//# sourceMappingURL=protection.js.map