# All files / src/node-obfuscators/replacers StringLiteralReplacer.ts

94.59% Statements 35/37
87.5% Branches 14/16
100% Functions 1/1
94.59% Lines 35/37

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     import { TUnicodeArrayCallsWrapper } from '../../types/custom-nodes/TUnicodeArrayCallsWrapper';
    import { TUnicodeArrayNode } from '../../types/custom-nodes/TUnicodeArrayNode';

    import { UnicodeArrayEncoding } from '../../enums/UnicodeArrayEncoding';

    import { AbstractReplacer } from './AbstractReplacer';
    import { NumberLiteralReplacer } from './NumberLiteralReplacer';
    import { UnicodeArray } from '../../UnicodeArray';
    import { Utils } from '../../Utils';

    export class StringLiteralReplacer extends AbstractReplacer {
        /**
         * @type {number}
         */
        private static minimumLengthForUnicodeArray: number = 3;

        /**
         * @type {string[]}
         */
        private static rc4Keys: string[] = Utils.getRandomGenerator()
            .n(() => Utils.getRandomGenerator().string({length: 4}), 50);

        /**
         * @param nodeValue
         * @returns {string}
         */
        public replace (nodeValue: string): string {
            const replaceWithUnicodeArrayFlag: boolean = (
                nodeValue.length >= StringLiteralReplacer.minimumLengthForUnicodeArray
                && Math.random() <= this.options.unicodeArrayThreshold
            );

            if (this.options.unicodeArray && replaceWithUnicodeArrayFlag) {
                return this.replaceStringLiteralWithUnicodeArrayCall(nodeValue);
            }

            return Utils.stringToUnicode(nodeValue);
        }

        /**
         * @param value
         * @returns {string}
         */
        private replaceStringLiteralWithUnicodeArrayCall (value: string): string {
            const unicodeArrayNode: TUnicodeArrayNode = <TUnicodeArrayNode>this.nodes.get('unicodeArrayNode');

            Iif (!unicodeArrayNode) {
                throw new ReferenceError('`unicodeArrayNode` node is not found in Map with custom nodes.');
            }

            let rc4Key: string = '';

            switch (this.options.unicodeArrayEncoding) {
                case UnicodeArrayEncoding.base64:
                    value = Utils.btoa(value);

                    break;

                case UnicodeArrayEncoding.rc4:
                    rc4Key = Utils.getRandomGenerator().pickone(StringLiteralReplacer.rc4Keys);
                    value = Utils.btoa(Utils.rc4(value, rc4Key));

                    break;
            }

            value = Utils.stringToUnicode(value);

            let unicodeArray: UnicodeArray = unicodeArrayNode.getNodeData(),
                indexOfExistingValue: number = unicodeArray.getIndexOf(value),
                indexOfValue: number,
                hexadecimalIndex: string;

            if (indexOfExistingValue >= 0) {
                indexOfValue = indexOfExistingValue;
            } else {
                indexOfValue = unicodeArray.getLength();
                unicodeArrayNode.updateNodeData(value);
            }

            hexadecimalIndex = new NumberLiteralReplacer(this.nodes, this.options)
                .replace(indexOfValue);

            const unicodeArrayCallsWrapper: TUnicodeArrayCallsWrapper = <TUnicodeArrayCallsWrapper>this.nodes.get('unicodeArrayCallsWrapper');

            Iif (!unicodeArrayCallsWrapper) {
                throw new ReferenceError('`unicodeArrayCallsWrapper` node is not found in Map with custom nodes.');
            }

            if (this.options.unicodeArrayEncoding === UnicodeArrayEncoding.rc4) {
                return `${unicodeArrayCallsWrapper.getNodeIdentifier()}('${hexadecimalIndex}', ${Utils.stringToUnicode(rc4Key)})`;
            }

            return `${unicodeArrayCallsWrapper.getNodeIdentifier()}('${hexadecimalIndex}')`;
        }
    }