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@lacspace/unsubscribe

v1.0.0Mail Kit0 deps

Mailing-list unsubscribe for webmail: RFC 2369 List-* header parsing (List-Unsubscribe, List-Help, List-Subscribe, List-Post, List-Owner, List-Archive), RFC 2919 List-Id, and RFC 8058 one-click unsubscribe POST with an SSRF guard (private/loopback/link-local/CGNAT/ULA IPs, localhost, .local/.internal/.lan, userinfo), no cookies, https-only redirects. Picks the best method for an Unsubscribe button: one-click > mailto > https > none. Zero dependencies, isomorphic (global fetch).

npm i @lacspace/unsubscribe
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Usage

unsubscribe.ts
import { unsubscribeOptions, oneClickUnsubscribe, parseListUnsubscribe, parseListId } from "@lacspace/unsubscribe";

parseListUnsubscribe(
  "<mailto:leave@news.example.com?subject=unsubscribe>, <https://news.example.com/u/abc>",
  "List-Unsubscribe=One-Click",
);
// { https: ["https://news.example.com/u/abc"], http: [],
//   mailto: [{ to: "leave@news.example.com", subject: "unsubscribe" }], oneClick: true, raw: "…" }

parseListId("Weekly Digest <digest.example.com>"); // { name: "Weekly Digest", id: "digest.example.com" }

unsubscribeOptions(message.headers);
// { method: "one-click", url: "https://news.example.com/u/abc", listId: {…}, listUnsubscribe: {…} }

await oneClickUnsubscribe("https://news.example.com/u/abc"); // { ok: true, status: 200 }

Exports 16

ONE_CLICK_BODYdecodeEncodedWordsgetHeaderisOneClickPostisPrivateHostisPrivateIPv4isPrivateIPv6isPrivateIpmailtoUnsubscribeoneClickUnsubscribeparseListHeadersparseListIdparseListUnsubscribeparseListUrlsparseMailtounsubscribeOptions

Keywords

unsubscribelist-unsubscribeone-clickrfc8058rfc2369rfc2919

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