// ==UserScript==
// @name        Imgur links rewriting on Ptt
// @namespace   https://github.com/gslin/imgur-links-rewriting-on-ptt
// @match       https://www.ptt.cc/bbs/*
// @match       https://www.ptt.cc/man/*
// @grant       GM_xmlhttpRequest
// @version     0.20240912.1
// @author      Gea-Suan Lin <gslin@gslin.com>
// @description Rewrite imgur links to bypass referrer check.
// @license     MIT
// ==/UserScript==
(() => {
'use strict';
const get_imgur_id_suffix = url => {
const a = url.match(/^https?:\/\/(i\.|m\.)?imgur\.com\/(\w+)\.?(\w+)?/);
return [a[2], a[3]];
};
const re_imgur_album = /^https?:\/\/imgur\.com\/(a|gallery)\//;
document.querySelectorAll('a[href*="//imgur.com/"], a[href*="//i.imgur.com/"], a[href*="//m.imgur.com/"]').forEach(async el => {
// Remove ".richcontent" if existing.
const next = el.nextElementSibling;
if (next && next.classList.contains('richcontent')) {
next.remove();
}
// Remove ".richcontent" if existing.
const next2 = el.parentElement.nextElementSibling;
if (next2 && next2.classList.contains('richcontent')) {
next2.remove();
}
// Remove ".richcontent" for ".push" case.
const el_p2 = el.parentElement.parentElement;
if (el_p2 && el_p2.classList.contains('push')) {
const el_p2_next = el_p2.nextElementSibling;
if (el_p2_next && el_p2_next.classList.contains('richcontent')) {
el_p2_next.remove();
}
}
const href = el.getAttribute('href');
let imgur_id = '';
let imgur_suffix = '';
if (href.match(re_imgur_album)) {
// album case.
const res = await new Promise(resolve => {
GM_xmlhttpRequest({
'anonymous': true,
'headers': {
'Referer': 'https://imgur.com/',
},
'method': 'GET',
'onload': res => {
resolve(res.responseText);
},
'url': href,
});
});
const parser = new DOMParser();
const doc = parser.parseFromString(res, 'text/html');
const og_image = doc.querySelector('meta[property="og:image"]');
const img_url = og_image.getAttribute('content');
[imgur_id, imgur_suffix] = get_imgur_id_suffix(img_url);
} else {
// image case.
[imgur_id, imgur_suffix] = get_imgur_id_suffix(href);
}
// Change to webp only if it's not gif.
if (imgur_suffix !== 'gif') {
imgur_suffix = 'webp';
}
const container = document.createElement('div');
container.setAttribute('style', 'margin-top:0.5em;text-align:center;');
const img = document.createElement('img');
img.setAttribute('referrerpolicy', 'no-referrer');
img.setAttribute('src', 'https://i.imgur.com/' + imgur_id + '.' + imgur_suffix);
container.appendChild(img);
el.insertAdjacentElement('afterend', container);
});
})();