44 lines
1 KiB
TypeScript
44 lines
1 KiB
TypeScript
export type ChainResult = {
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is_chain: boolean;
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hops: number;
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final_url?: string;
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error?: string;
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};
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export async function checkRedirectChain(url: string): Promise<ChainResult> {
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let current = url;
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let hops = 0;
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const maxHops = 5;
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try {
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while (hops < maxHops) {
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const res = await fetch(current, {
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method: "HEAD",
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redirect: "manual",
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signal: AbortSignal.timeout(8_000),
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headers: { "User-Agent": "corex-nexredirect/chain-check" },
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});
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if (res.status >= 300 && res.status < 400) {
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const location = res.headers.get("location");
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if (!location) break;
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try {
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current = new URL(location, current).href;
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} catch {
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break;
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}
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hops++;
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} else {
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break;
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}
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}
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} catch (e) {
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return {
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is_chain: hops > 0,
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hops,
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final_url: hops > 0 ? current : undefined,
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error: e instanceof Error ? e.message : String(e),
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};
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}
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return { is_chain: hops > 0, hops, final_url: hops > 0 ? current : undefined };
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}
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