Violentmonkey script that scan magnet links and sends an RPC request to Transmission on click

violentmonkey.js

// ==UserScript==
// @name         Magnet link to Transmission
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Automatically send magnet link to Transmission for download
// @match        *://*/*
// @grant        GM_xmlhttpRequest
// ==/UserScript==

const transmissionUrl = "http://xxxx:9091/transmission/rpc";
const transmissionAuth = "";

(function () {
  'use strict';



  // Find all magnet links on the page
  const magnetLinks = document.querySelectorAll('a[href^="magnet:"]');

  // Loop through the magnet links
  magnetLinks.forEach((link) => {
    link.addEventListener('click', (event) => {

      event.preventDefault();

      // Get the magnet link
      const magnet = link.href;

      // Set up the RPC request to Transmission
      const request = {
        "method": "torrent-add",
        "arguments": {
          "paused": false,
          "filename": magnet
        }
      };


      GM_xmlhttpRequest({
        method: "POST",
        url: transmissionUrl,
        headers: {
          "Authorization": "Basic " + btoa(transmissionAuth),
          "Content-Type": "application/json"
        },
        onload: (response) => {
          if (response.status === 409) {
            // セッションIDの取得に失敗した場合、エラーメッセージからセッションIDを抜き出して、リクエストに再度付与して送信する
            const sessionId = response.responseText.match(/X-Transmission-Session-Id: ([a-zA-Z0-9]+)/)[1];
            GM_xmlhttpRequest({
              method: "POST",
              url: transmissionUrl,
              headers: {
                "Authorization": "Basic " + btoa(transmissionAuth),
                "X-Transmission-Session-Id": sessionId,
                "Content-Type": "application/json"
              },
              data: JSON.stringify(request),
              onload: (response) => {
                if (response.status === 200) {
                  console.log("Transmission RPC request succeeded:", response.responseText);
                } else {
                  console.error("Transmission RPC request failed:", response);
                }
              },
              onerror: (error) => {
                console.error("Transmission RPC request failed:", error);
              }
            });
          } else if (response.status === 200) {
            // セッション// IDを取得して、トレントを追加するリクエストを送信する
            const sessionId = response.responseHeaders.match(/X-Transmission-Session-Id: ([a-zA-Z0-9]+)/)[1];
            addTorrentRequest["arguments"]["filename"] = "magnet:?xt=urn:btih:トレントのハッシュ値";
            GM_xmlhttpRequest({
              method: "POST",
              url: transmissionUrl,
              headers: {
                "Authorization": "Basic " + btoa(transmissionAuth),
                "X-Transmission-Session-Id": sessionId,
                "Content-Type": "application/json"
              },
              data: JSON.stringify(addTorrentRequest),
              onload: (response) => {
                if (response.status === 200) {
                  console.log("Transmission RPC request succeeded:", response.responseText);
                } else {
                  console.error("Transmission RPC request failed:", response);
                }
              },
              onerror: (error) => {
                console.error("Transmission RPC request failed:", error);
              }
            });
          } else {
            console.error("Transmission RPC request failed:", response);
          }
        }

      });
    });
  });
})();