@renyuneyun/parse-link-header-ts/dist/index.js

Parses a link header and returns information for each contained link.

const PARSE_LINK_HEADER_MAXLEN = 2000;
function hasRel(link) {
    if (link === null) {
        return false;
    }
    return link.rel != null;
}
function intoRels(acc, link) {
    function splitRel(rel) {
        if (!(rel in acc)) {
            acc[rel] = [];
        }
        acc[rel].push({ ...link, ...{ rel } });
    }
    link.rel.split(/\s+/).forEach(splitRel);
    return acc;
}
function createObjects(acc, p) {
    const m = p.match(/\s*(.+)\s*=\s*"?([^"]+)"?/);
    if (m)
        acc[m[1]] = m[2];
    return acc;
}
function parseLink(link, base) {
    const m = link.match(/<?([^>]*)>(.*)/);
    if (m === null) {
        throw new Error('Invalid link header');
    }
    const linkUrl = m[1];
    const parts = m[2].split(';');
    const parsedUrl = new URL(linkUrl, base);
    const qry = {};
    for (const [key, value] of parsedUrl.searchParams) {
        qry[key] = value;
    }
    parts.shift();
    let info = parts.reduce(createObjects, {});
    info = { ...qry, ...info, url: linkUrl };
    return info;
}
function checkHeader(linkHeader) {
    if (linkHeader.length > PARSE_LINK_HEADER_MAXLEN) {
        throw new Error(`Input string too long, it should be under ${PARSE_LINK_HEADER_MAXLEN} characters.`);
    }
}
export default function (linkHeader, base) {
    if (linkHeader === '') {
        throw new Error('linkHeader is empty');
    }
    checkHeader(linkHeader);
    return linkHeader
        .split(/,\s*</)
        .map((link) => parseLink(link, base))
        .filter(hasRel)
        .reduce(intoRels, {});
}