expect-ct/index.js

Middleware to set the Expect-CT header

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function parseMaxAge(value) {
    if (value === undefined) {
        return 0;
    }
    else if (typeof value === "number" &&
        value >= 0 &&
        Number.isFinite(value)) {
        return Math.floor(value);
    }
    else {
        throw new Error(`Expect-CT: ${JSON.stringify(value)} is not a valid value for maxAge. Please choose a positive integer.`);
    }
}
function getHeaderValueFromOptions(options) {
    const directives = [];
    if (options.enforce) {
        directives.push("enforce");
    }
    directives.push(`max-age=${parseMaxAge(options.maxAge)}`);
    if (options.reportUri) {
        directives.push(`report-uri="${options.reportUri}"`);
    }
    return directives.join(", ");
}
function expectCt(options = {}) {
    const headerValue = getHeaderValueFromOptions(options);
    return function expectCtMiddleware(_req, res, next) {
        res.setHeader("Expect-CT", headerValue);
        next();
    };
}
module.exports = expectCt;
exports.default = expectCt;