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fix: fix with protected string issue - visibility, concat expressions and escape sequences #710

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fix: fix with protected string issue - visibility, concat expressions and escape sequences #710

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60 changes: 49 additions & 11 deletions src/plugins/bytecode.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -161,13 +161,6 @@ export function bytecodePlugin(options: BytecodeOptions = {}): Plugin | null {

const filter = createFilter(/\.(m?[jt]s|[jt]sx)$/)

const escapeRegExpString = (str: string): string => {
return str
.replace(/\\/g, '\\\\\\\\')
.replace(/[|{}()[\]^$+*?.]/g, '\\$&')
.replace(/-/g, '\\u002d')
}

const transformAllChunks = _chunkAlias.length === 0
const isBytecodeChunk = (chunkName: string): boolean => {
return transformAllChunks || _chunkAlias.some(alias => alias === chunkName)
Expand Down Expand Up @@ -208,20 +201,65 @@ export function bytecodePlugin(options: BytecodeOptions = {}): Plugin | null {
let match: RegExpExecArray | null
let s: MagicString | undefined

function obfuscateString(input: string): string {
const key = Array.from({ length: 4 }, () => Math.floor(Math.random() * 256))
const hexArray = Array.from(input).map(
(c, i) => (c.charCodeAt(0) + key[i % key.length]) ^ key[(i + 1) % key.length]
)
return `(function(a,b){
return String.fromCharCode(...a.map((x,i) => (x ^ b[(i + 1) % b.length]) - b[i % b.length]));
})([${hexArray.join(',')}],[${key.join(',')}])`
}

function parseStringLiteral(literal: string): string {
try {
return new Function('return ' + literal)()
} catch {
return literal.slice(1, -1)
}
}

protectedStrings.forEach(str => {
const escapedStr = escapeRegExpString(str)
const escapedStr = str.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&')
const re = new RegExp(`\\u0027${escapedStr}\\u0027|\\u0022${escapedStr}\\u0022`, 'g')
const charCodes = Array.from(str).map(s => s.charCodeAt(0))
const replacement = `String.fromCharCode(${charCodes.toString()})`
const replacement = obfuscateString(str)

while ((match = re.exec(code))) {
s ||= new MagicString(code)
s = s || new MagicString(code)
const [full] = match
s.overwrite(match.index, match.index + full.length, replacement, {
contentOnly: true
})
}
})

const concatRegex = /((["'](?:(?=(\\?))\3.)*?["'])(?:\s*\+\s*(["'](?:(?=(\\?))\5.)*?["']))+)/g
while ((match = concatRegex.exec(code))) {
let evaluated: string
try {
evaluated = new Function('return ' + match[0])()
} catch {
continue
}
if (protectedStrings.includes(evaluated)) {
s = s || new MagicString(code)
s.overwrite(match.index, match.index + match[0].length, obfuscateString(evaluated), {
contentOnly: true
})
}
}

const stringLiteralRegex = /(["'])(?:(?=(\\?))\2.)*?\1/g
while ((match = stringLiteralRegex.exec(code))) {
const literalValue = parseStringLiteral(match[0])
if (protectedStrings.includes(literalValue)) {
s = s || new MagicString(code)
s.overwrite(match.index, match.index + match[0].length, obfuscateString(literalValue), {
contentOnly: true
})
}
}

if (s) {
return {
code: s.toString(),
Expand Down