60 lines
2.1 KiB
JavaScript
60 lines
2.1 KiB
JavaScript
import { createHash, randomBytes } from "crypto";
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const CLAUDE_VERSION = "2.1.63";
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// Generate billing header matching real Claude Code format:
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// x-anthropic-billing-header: cc_version=<ver>.<build>; cc_entrypoint=cli; cch=<hash>;
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function generateBillingHeader(payload) {
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const content = JSON.stringify(payload);
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const cch = createHash("sha256").update(content).digest("hex").slice(0, 5);
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const buildHash = randomBytes(2).toString("hex").slice(0, 3);
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return `x-anthropic-billing-header: cc_version=${CLAUDE_VERSION}.${buildHash}; cc_entrypoint=cli; cch=${cch};`;
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}
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// Generate a random UUID v4
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function generateFakeUserID() {
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const bytes = randomBytes(16);
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bytes[6] = (bytes[6] & 0x0f) | 0x40;
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bytes[8] = (bytes[8] & 0x3f) | 0x80;
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const hex = bytes.toString("hex");
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return `${hex.slice(0,8)}-${hex.slice(8,12)}-${hex.slice(12,16)}-${hex.slice(16,20)}-${hex.slice(20)}`;
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}
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/**
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* Apply Claude cloaking to request body:
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* 1. Inject billing header as first system block
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* 2. Inject fake user ID into metadata
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*
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* Only applies when using OAuth token (sk-ant-oat).
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* @param {object} body - Claude API request body
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* @param {string} apiKey - API key or OAuth token
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* @returns {object} Modified body
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*/
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export function applyCloaking(body, apiKey) {
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if (!apiKey || !apiKey.includes("sk-ant-oat")) return body;
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const result = { ...body };
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// Inject billing header as system[0], preserve existing system blocks
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const billingText = generateBillingHeader(body);
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const billingBlock = { type: "text", text: billingText };
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if (Array.isArray(result.system)) {
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// Skip if already injected
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if (!result.system[0]?.text?.startsWith("x-anthropic-billing-header:")) {
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result.system = [billingBlock, ...result.system];
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}
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} else if (typeof result.system === "string") {
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result.system = [billingBlock, { type: "text", text: result.system }];
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} else {
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result.system = [billingBlock];
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}
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// Inject fake user ID into metadata
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const existingUserId = result.metadata?.user_id;
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if (!existingUserId) {
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result.metadata = { ...result.metadata, user_id: generateFakeUserID() };
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}
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return result;
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}
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