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cd8bd0a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | /**
* Sensitive word obfuscation for Claude Code requests.
*
* Obfuscates configurable words in user messages to prevent detection
* by upstream content filters. Uses zero-width characters to break
* pattern matching while preserving readability.
*/
// Unicode zero-width joiner inserted between characters
const ZWJ = "\u200d";
const DEFAULT_SENSITIVE_WORDS = [
"opencode",
"open-code",
"cline",
"roo-cline",
"roo_cline",
"cursor",
"windsurf",
"aider",
"continue.dev",
"copilot",
"avante",
"codecompanion",
];
let sensitiveWords = [...DEFAULT_SENSITIVE_WORDS];
export function setSensitiveWords(words: string[]): void {
sensitiveWords = words.length > 0 ? words : [...DEFAULT_SENSITIVE_WORDS];
}
export function getSensitiveWords(): string[] {
return [...sensitiveWords];
}
function obfuscateWord(word: string): string {
if (word.length <= 1) return word;
// Insert ZWJ after first character
return word[0] + ZWJ + word.slice(1);
}
// Per-word regex cache — obfuscateSensitiveWords recompiles one RegExp per word on every
// request body otherwise. Bounded by distinct configured words; global regexes are safe to
// reuse because String.replace resets lastIndex.
const _obfuscationRegexCache = new Map<string, RegExp>();
function getObfuscationRegex(word: string): RegExp {
let regex = _obfuscationRegexCache.get(word);
if (!regex) {
if (_obfuscationRegexCache.size > 2000) _obfuscationRegexCache.clear();
regex = new RegExp(escapeRegex(word), "gi");
_obfuscationRegexCache.set(word, regex);
}
return regex;
}
export function obfuscateSensitiveWords(text: string): string {
if (!text || sensitiveWords.length === 0) return text;
let result = text;
for (const word of sensitiveWords) {
if (!word) continue;
// Case-insensitive replacement (cached: see getObfuscationRegex)
const regex = getObfuscationRegex(word);
result = result.replace(regex, (match) => obfuscateWord(match));
}
return result;
}
export function obfuscateInBody(body: Record<string, unknown>): void {
// System prompt (Claude format: string or array of blocks)
if (typeof body.system === "string") {
body.system = obfuscateSensitiveWords(body.system);
} else if (Array.isArray(body.system)) {
for (const block of body.system as Array<Record<string, unknown>>) {
if (typeof block.text === "string") {
block.text = obfuscateSensitiveWords(block.text);
}
}
}
// Messages (all roles, not just user — system/assistant may also contain sensitive words)
const messages = body.messages as Array<Record<string, unknown>> | undefined;
if (Array.isArray(messages)) {
for (const msg of messages) {
const content = msg.content;
if (typeof content === "string") {
msg.content = obfuscateSensitiveWords(content);
} else if (Array.isArray(content)) {
for (const block of content as Array<Record<string, unknown>>) {
if (typeof block.text === "string") {
block.text = obfuscateSensitiveWords(block.text);
}
}
}
}
}
// Tool descriptions (may contain URLs or names like "opencode")
const tools = body.tools as Array<Record<string, unknown>> | undefined;
if (Array.isArray(tools)) {
for (const tool of tools) {
if (typeof tool.description === "string") {
tool.description = obfuscateSensitiveWords(tool.description);
}
const fn = tool.function as Record<string, unknown> | undefined;
if (fn && typeof fn.description === "string") {
fn.description = obfuscateSensitiveWords(fn.description);
}
}
}
}
function escapeRegex(str: string): string {
return str.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
}
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