javascript-obfuscator/dist/src/custom-nodes/unicode-array-nodes/UnicodeArrayDecodeNode.js

"use strict";
const esprima = require('esprima');
const JavaScriptObfuscator_1 = require('../../JavaScriptObfuscator');
const AppendState_1 = require("../../enums/AppendState");
const NoCustomNodesPreset_1 = require("../../preset-options/NoCustomNodesPreset");
const Node_1 = require('../Node');
const NodeUtils_1 = require("../../NodeUtils");
const Utils_1 = require("../../Utils");
class UnicodeArrayDecodeNode extends Node_1.Node {
    constructor(unicodeArrayName, unicodeArray) {
        super();
        this.appendState = AppendState_1.AppendState.AfterObfuscation;
        this.unicodeArrayName = unicodeArrayName;
        this.unicodeArray = unicodeArray;
        this.node = this.getNodeStructure();
    }
    appendNode(blockScopeNode) {
        NodeUtils_1.NodeUtils.insertNodeAtIndex(blockScopeNode.body, this.getNode(), 1);
    }
    getNode() {
        if (!this.unicodeArray.length) {
            return;
        }
        return super.getNode();
    }
    getNodeStructure() {
        const atobPolyfill = JavaScriptObfuscator_1.JavaScriptObfuscator.obfuscate(`
                var object = []['filter']['constructor']('return this')();
                var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
    
                object.atob || (
                    object.atob = function(input) {
                        var str = String(input).replace(/=+$/, '');
                        for (
                            var bc = 0, bs, buffer, idx = 0, output = '';
                            buffer = str.charAt(idx++);
                            ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
                                bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0
                        ) {
                            buffer = chars.indexOf(buffer);
                        }
                    return output;
                });
            `, NoCustomNodesPreset_1.NO_CUSTOM_NODES_PRESET), indexVariableName = Utils_1.Utils.getRandomVariableName(), tempArrayName = Utils_1.Utils.getRandomVariableName();
        let node = esprima.parse(`
            (function () {
                ${atobPolyfill}
              
                var ${tempArrayName} = [];
                
                for (var ${indexVariableName} in ${this.unicodeArrayName}) {
                    ${tempArrayName}[${Utils_1.Utils.stringToUnicode('push')}](decodeURI(atob(${this.unicodeArrayName}[${indexVariableName}])));
                }
                
                ${this.unicodeArrayName} = ${tempArrayName};
            })();
        `);
        NodeUtils_1.NodeUtils.addXVerbatimPropertyToLiterals(node);
        return NodeUtils_1.NodeUtils.getBlockScopeNodeByIndex(node);
    }
}
exports.UnicodeArrayDecodeNode = UnicodeArrayDecodeNode;