@x402-hpke/node/dist/extensions.js

Provider-agnostic HPKE envelope library for x402 (Node) — cross-language interop with Python

import { X402ExtensionUnapprovedError } from "./errors.js";
export let APPROVED_EXTENSION_HEADERS = [
    "X-402-Routing",
    "X-402-Limits",
    "X-402-Acceptable",
    "X-402-Metadata",
    "X-402-Security"
];
export function canonicalizeExtensionHeader(h) {
    const found = APPROVED_EXTENSION_HEADERS.find((ah) => ah.toLowerCase() === h.toLowerCase());
    if (!found)
        throw new X402ExtensionUnapprovedError("X402_EXTENSION_UNAPPROVED");
    return found;
}
export const isApprovedExtensionHeader = (h) => {
    return APPROVED_EXTENSION_HEADERS.some((ah) => ah.toLowerCase() === h.toLowerCase());
};
// Test-only helper to register additional approved headers at runtime
export function registerApprovedExtensionHeader(header) {
    const exists = APPROVED_EXTENSION_HEADERS.some((h) => h.toLowerCase() === String(header).toLowerCase());
    if (!exists) {
        APPROVED_EXTENSION_HEADERS.push(header);
    }
}