wehub-resource-sync
47 lines
1.4 KiB
TypeScript
47 lines
1.4 KiB
TypeScript
/**
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* Claude Code fingerprint computation.
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*
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* The billing header includes a 3-char fingerprint derived from:
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* SHA256(SALT + msg[4] + msg[7] + msg[20] + version)[:3]
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*
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* This fingerprint is computed from the first user message text and
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* included in cc_version=VERSION.FINGERPRINT in the billing header.
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*/
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import { createHash } from "node:crypto";
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const FINGERPRINT_SALT = "59cf53e54c78";
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export function computeFingerprint(firstUserMessageText: string, version: string): string {
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const indices = [4, 7, 20];
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const chars = indices.map((i) => firstUserMessageText[i] || "0").join("");
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const input = `${FINGERPRINT_SALT}${chars}${version}`;
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const hash = createHash("sha256").update(input).digest("hex");
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return hash.slice(0, 3);
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}
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export function extractFirstUserMessageText(
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messages: Array<{ role?: string; content?: unknown }> | undefined
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): string {
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if (!Array.isArray(messages)) return "";
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for (const msg of messages) {
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if (String(msg?.role).toLowerCase() !== "user") continue;
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const content = msg?.content;
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if (typeof content === "string") return content;
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if (Array.isArray(content)) {
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for (const block of content) {
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if (
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block &&
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typeof block === "object" &&
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"text" in block &&
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typeof (block as Record<string, unknown>).text === "string"
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) {
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return (block as Record<string, unknown>).text as string;
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}
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}
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}
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return "";
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}
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return "";
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}
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