export const REQUEST_HOP_BY_HOP_HEADERS = new Set([
    "connection",
    "keep-alive",
    "proxy-authenticate",
    "proxy-authorization",
    "te",
    "trailers",
    "transfer-encoding",
    "upgrade",
    "host",
]);
export const RESPONSE_HOP_BY_HOP_HEADERS = new Set([
    "connection",
    "keep-alive",
    "transfer-encoding",
    "content-encoding",
]);
export const readBearer = (req) => {
    const raw = req.headers.authorization ?? "";
    const m = /^Bearer\s+(.+)$/i.exec(raw);
    return m?.[1]?.trim() ?? null;
};
export const readBodyBuffer = async (req, maxBytes) => {
    const chunks = [];
    let total = 0;
    for await (const chunk of req) {
        const b = typeof chunk === "string" ? Buffer.from(chunk) : chunk;
        total += b.length;
        if (total > maxBytes) {
            throw new Error(`Request body exceeds ${maxBytes} bytes`);
        }
        chunks.push(b);
    }
    return Buffer.concat(chunks);
};
export const copyHeadersForProxy = (req, opts) => {
    const out = new Headers();
    for (const [k, v] of Object.entries(req.headers)) {
        if (!v) {
            continue;
        }
        const lk = k.toLowerCase();
        if (REQUEST_HOP_BY_HOP_HEADERS.has(lk)) {
            continue;
        }
        if (lk === "authorization") {
            continue;
        }
        if (opts?.skipLowercase?.has(lk)) {
            continue;
        }
        out.set(k, Array.isArray(v) ? v.join(", ") : v);
    }
    return out;
};
export const copyOutgoingHeadersForProxy = (req, opts) => {
    const out = {};
    for (const [k, v] of Object.entries(req.headers)) {
        if (v === undefined) {
            continue;
        }
        const lk = k.toLowerCase();
        if (REQUEST_HOP_BY_HOP_HEADERS.has(lk)) {
            continue;
        }
        if (lk === "authorization") {
            continue;
        }
        if (opts?.skipLowercase?.has(lk)) {
            continue;
        }
        out[k] = v;
    }
    return out;
};
export const isSafeProxyPath = (p) => {
    if (!p.startsWith("/")) {
        return false;
    }
    for (const rawSeg of p.split("/")) {
        if (rawSeg.length === 0) {
            continue;
        }
        if (rawSeg === "." || rawSeg === "..") {
            return false;
        }
        let seg;
        try {
            seg = decodeURIComponent(rawSeg);
        }
        catch {
            return false;
        }
        if (seg === "." || seg === "..") {
            return false;
        }
        if (seg.includes("/") || seg.includes("\\")) {
            return false;
        }
    }
    return true;
};