Keycloak

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export type Links = {
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  prev?: Record<string, string>;
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  next?: Record<string, string>;
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};
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export function parseLinks(response: Response): Links {
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  const linkHeader = response.headers.get("link");
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  if (!linkHeader) {
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    throw new Error("Attempted to parse links, but no header was found.");
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  }
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  const links = linkHeader.split(/,\s*</);
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  return links.reduce<Links>((acc: Links, link: string) => {
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    const matcher = link.match(/<?([^>]*)>(.*)/);
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    if (!matcher) return {};
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    const linkUrl = matcher[1];
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    const rel = matcher[2].match(/\s*(.+)\s*=\s*"?([^"]+)"?/);
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    if (rel) {
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      const link: Record<string, string> = {};
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      for (const [key, value] of new URL(linkUrl).searchParams.entries()) {
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        link[key] = value;
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      }
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      acc[rel[2] as keyof Links] = link;
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    }
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    return acc;
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  }, {});
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}
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