"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function getHeaderValueFromOptions({ action = "SAMEORIGIN", }) {
    action = String(action).toUpperCase();
    if (action === "SAME-ORIGIN") {
        return "SAMEORIGIN";
    }
    else if (action === "DENY" || action === "SAMEORIGIN") {
        return action;
    }
    else if (action === "ALLOW-FROM") {
        throw new Error("X-Frame-Options no longer supports `ALLOW-FROM` due to poor browser support. See <https://github.com/helmetjs/helmet/wiki/How-to-use-X%E2%80%93Frame%E2%80%93Options's-%60ALLOW%E2%80%93FROM%60-directive> for more info.");
    }
    else {
        throw new Error(`X-Frame-Options received an invalid action ${JSON.stringify(action)}`);
    }
}
function xFrameOptions(options = {}) {
    const headerValue = getHeaderValueFromOptions(options);
    return function xFrameOptionsMiddleware(_req, res, next) {
        res.setHeader("X-Frame-Options", headerValue);
        next();
    };
}
module.exports = xFrameOptions;
exports.default = xFrameOptions;