Twitter/X Max Image

Load max-res Twitter/X images, auto-hide when idle

您需要先安裝使用者腳本管理器擴展,如 TampermonkeyGreasemonkeyViolentmonkey 之後才能安裝該腳本。

You will need to install an extension such as Tampermonkey to install this script.

您需要先安裝使用者腳本管理器擴充功能,如 TampermonkeyViolentmonkey 後才能安裝該腳本。

您需要先安裝使用者腳本管理器擴充功能,如 TampermonkeyUserscripts 後才能安裝該腳本。

你需要先安裝一款使用者腳本管理器擴展,比如 Tampermonkey,才能安裝此腳本

您需要先安裝使用者腳本管理器擴充功能後才能安裝該腳本。

(我已經安裝了使用者腳本管理器,讓我安裝!)

你需要先安裝一款使用者樣式管理器擴展,比如 Stylus,才能安裝此樣式

你需要先安裝一款使用者樣式管理器擴展,比如 Stylus,才能安裝此樣式

你需要先安裝一款使用者樣式管理器擴展,比如 Stylus,才能安裝此樣式

你需要先安裝一款使用者樣式管理器擴展後才能安裝此樣式

你需要先安裝一款使用者樣式管理器擴展後才能安裝此樣式

你需要先安裝一款使用者樣式管理器擴展後才能安裝此樣式

(我已經安裝了使用者樣式管理器,讓我安裝!)

// ==UserScript==
// @name         Twitter/X Max Image
// @namespace    http://tampermonkey.net/
// @version      1.9
// @description  Load max-res Twitter/X images, auto-hide when idle
// @match        https://pbs.twimg.com/*
// @grant        GM_xmlhttpRequest
// @grant        GM_download
// @connect      pbs.twimg.com
// @run-at       document-start
// @author       nereids
// @icon         https://icons.duckduckgo.com/ip3/x.com.ico
// @license      MIT
// ==/UserScript==

(function () {
  'use strict';

  // --------- Redirect logic (loop-safe, try orig/original/no-name) ----------
  if (location.hostname === 'pbs.twimg.com') {
    const triedKey = 'pbs-max-redirected';
    if (sessionStorage.getItem(triedKey) !== '1') {
      const currentURL = new URL(location.href);
      const currName = currentURL.searchParams.get('name');
      if (!['orig', 'original', null].includes(currName)) {
        const candidates = ['orig', 'original', null];

        function head(url) {
          return new Promise(resolve => {
            try {
              GM_xmlhttpRequest({
                method: 'HEAD',
                url,
                headers: { 'Accept': 'image/*' },
                onload: (res) => resolve(res && res.status === 200),
                onerror: () => resolve(false),
                ontimeout: () => resolve(false)
              });
            } catch (e) { resolve(false); }
          });
        }

        (async () => {
          for (const name of candidates) {
            const u = new URL(location.href);
            if (name === null) u.searchParams.delete('name');
            else u.searchParams.set('name', name);
            if (u.href === location.href) continue;
            const ok = await head(u.href);
            if (ok) {
              sessionStorage.setItem(triedKey, '1');
              location.replace(u.href);
              return;
            }
          }
          sessionStorage.setItem(triedKey, '1');
        })();
      } else {
        sessionStorage.setItem(triedKey, '1');
      }
    }
  }

  // --------- Add SVG download button ----------
  function addDownloadButton() {
    if (location.hostname !== 'pbs.twimg.com') return;
    if (document.getElementById('pbs-svg-dl-btn')) return;

    const imageUrl = location.href;

    const btn = document.createElement('button');
    btn.id = 'pbs-svg-dl-btn';
    btn.type = 'button';
    btn.title = 'Download image';
    Object.assign(btn.style, {
      position: 'fixed',
      right: '22px',
      bottom: '22px',
      width: '48px',
      height: '48px',
      borderRadius: '50%',
      border: 'none',
      padding: '0',
      display: 'flex',
      alignItems: 'center',
      justifyContent: 'center',
      cursor: 'pointer',
      zIndex: 2147483647,
      boxShadow: '0 8px 18px rgba(2,6,23,0.35)',
      background: '#1d9bf0',
      backdropFilter: 'blur(4px)',
      transition: 'transform .12s ease, box-shadow .12s ease, opacity 0.4s ease',
    });

    // --- CHANGE THIS SVG TO YOUR OWN IF YOU WANT ---
    btn.innerHTML = `
      <svg xmlns="http://www.w3.org/2000/svg" height="36px" viewBox="0 -960 960 960" width="36px" fill="#e3e3e3">
        <path d="M433-398v-329q0-20 13.5-33.5T480-774q20 0 33.5 13.5T527-727v331l118-118q14-14 33-14t33 14q14 14 14 33t-14 33L513-250q-14 14-34 14t-34-14L247-448q-14-14-14-33t14-33q14-14 33.5-14.5T314-515l119 117Z"/>
      </svg>
    `;

    // Download logic
    btn.addEventListener('click', async (e) => {
      e.stopPropagation();
      e.preventDefault();

      try {
        const urlObj = new URL(imageUrl);
        let fmt = (urlObj.searchParams.get('format') || '').toLowerCase();
        if (fmt === 'jfif' || fmt === 'jpeg') fmt = 'jpg';
        if (!fmt) {
          const pathExtMatch = urlObj.pathname.match(/\.([a-zA-Z0-9]+)$/);
          if (pathExtMatch) fmt = pathExtMatch[1].toLowerCase();
        }
        if (!fmt) fmt = 'jpg';

        let base = urlObj.pathname.split('/').pop() || 'image';
        base = base.replace(/\.[^/.]+$/, '');
        let filename = `${base}.${fmt}`;

        if (typeof GM_download === 'function') {
          try {
            GM_download({
              url: imageUrl,
              name: filename,
              onerror: () => fetchAndSave(imageUrl, filename)
            });
            return;
          } catch (err) { /* fallback */ }
        }
        await fetchAndSave(imageUrl, filename);
      } catch (err) {
        console.error('Download failed', err);
      }
    });

    function fetchAndSave(url, filename) {
      return fetch(url, { mode: 'cors' })
        .then(resp => {
          if (!resp.ok) throw new Error('Network not ok');
          return resp.blob().then(blob => {
            const ct = resp.headers.get('content-type') || '';
            let ext = filename.split('.').pop().toLowerCase();
            if (ct.includes('jpeg')) ext = 'jpg';
            if (ct.includes('png')) ext = 'png';
            if (ct.includes('webp')) ext = 'webp';
            if (!filename.toLowerCase().endsWith('.' + ext)) {
              filename = filename.replace(/\.[^/.]+$/, '') + '.' + ext;
            }
            const blobUrl = URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = blobUrl;
            a.download = filename;
            document.body.appendChild(a);
            a.click();
            a.remove();
            setTimeout(() => URL.revokeObjectURL(blobUrl), 5000);
          });
        })
        .catch(err => {
          console.error('fetchAndSave failed', err);
          window.open(url, '_blank', 'noopener');
        });
    }

    // Append button
    const attach = () => { document.body && document.body.appendChild(btn); };
    if (document.body) attach();
    else document.addEventListener('DOMContentLoaded', attach);

    // --- Auto-hide logic ---
    let hideTimeout;
    function showButton() {
      btn.style.opacity = '1';
      btn.style.pointerEvents = 'auto';
      clearTimeout(hideTimeout);
      hideTimeout = setTimeout(hideButton, 1500); // hide after 1.5s
    }
    function hideButton() {
      btn.style.opacity = '0';
      btn.style.pointerEvents = 'none';
    }
    showButton();
    document.addEventListener('mousemove', showButton);
  }

  // Wait for DOM
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', addDownloadButton, { once: true });
  } else {
    setTimeout(addDownloadButton, 120);
  }

})();