@nestjs/core/helpers/cookies/parse-cookie-header.js

Nest - modern, fast, powerful node.js web framework (@core)

/**
 * Parses a `Cookie` request header (RFC 6265, section 5.4) into a
 * prototype-less dictionary.
 *
 * - pairs are separated by `;`, and split on the first `=` only;
 * - names and values are trimmed, and a value wrapped in double quotes is
 *   unquoted;
 * - values are percent-decoded, falling back to the raw value when they are
 *   not valid percent-encoding;
 * - pairs without `=` or with an empty name are ignored;
 * - when a name occurs more than once, the first occurrence wins (browsers
 *   send the most specific path first).
 */
export function parseCookieHeader(header) {
    const cookies = Object.create(null);
    if (!header) {
        return cookies;
    }
    const source = Array.isArray(header) ? header.join('; ') : String(header);
    for (const pair of source.split(';')) {
        const eqIndex = pair.indexOf('=');
        if (eqIndex === -1) {
            continue;
        }
        const name = pair.slice(0, eqIndex).trim();
        if (!name || name in cookies) {
            continue;
        }
        let value = pair.slice(eqIndex + 1).trim();
        if (value.length >= 2 && value[0] === '"' && value.endsWith('"')) {
            value = value.slice(1, -1);
        }
        cookies[name] = safeDecode(value);
    }
    return cookies;
}
function safeDecode(value) {
    if (!value.includes('%')) {
        return value;
    }
    try {
        return decodeURIComponent(value);
    }
    catch {
        return value;
    }
}