[HFR] Links preview

Previsualise le contenu des liens dans les posts
当前为 2018-11-03 提交的版本，查看最新版本。
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// ==UserScript==
// @name         [HFR] Links preview
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Previsualise le contenu des liens dans les posts
// @icon         http://reho.st/self/40f387c9f48884a57e8bbe05e108ed4bd59b72ce.png
// @author       Garath_
// @include      https://forum.hardware.fr/forum2.php*
// @include      https://forum.hardware.fr/hfr/*
// @grant        GM_xmlhttpRequest
// ==/UserScript==


var auSurvol = true;

var links = document.querySelectorAll("td.messCase2 > div[id^='para'] > p > a.cLink, table.spoiler a.cLink");

function truncate(str, n)
{
    var isTooLong = str.length > n,
    s_ = isTooLong ? str.substr(0,n-1) : str;
    //s_ = isTooLong ? s_.substr(0,s_.lastIndexOf(' ')) : s_;
    return isTooLong ? s_ + '...' : s_;
}


function format(txt, href) {
    var parser = new DOMParser();
    var xmlDoc = parser.parseFromString(txt, 'text/html');

    const metas = xmlDoc.getElementsByTagName('meta');
    var des = "";
    var title = "";
    var image = "";
    var link = "";
    var url = "";
    var resolve = false;


    for (let i = 0; i < metas.length; i++) {
        if (metas[i].getAttribute('name') === "description") {
            des = metas[i].getAttribute('content');
        }
        if (metas[i].getAttribute('property') === "og:title") {
            title = metas[i].getAttribute('content');
        }
        if (metas[i].getAttribute('property') === "og:url") {
            link = metas[i].getAttribute('content');
        }
        if (metas[i].getAttribute('property') === "og:image") {
            image = metas[i].getAttribute('content');
        }
        if (metas[i].getAttribute('property') === "og:url") {
            url = metas[i].getAttribute('content');
        }
    }

    if (title === "") {
        var t = xmlDoc.getElementsByTagName('title')[0];
        if (t) {
            title = t.innerText;
        }
    }

    var newLink = document.createElement("div");
    newLink.style.cssText = "background-color: white; border:1px; border-style:solid; border-color:#808080; padding: 5px; overflow:hidden; max-width:500px; border-radius:10px;"

    if (image) {
        var img = document.createElement("img");
        img.setAttribute("src", image);
        img.style.cssText = "float:left; margin-right:3px; max-height:100px; max-width:100px";
        newLink.appendChild(img);

        resolve = true;
    }

    if (title) {
        var a = document.createElement("a");
        a.setAttribute("href", href);
        a.style.cssText = "color: black; font-weight: bold;";
        a.appendChild(document.createTextNode(truncate(title, 100)));
        newLink.appendChild(a);
    }

    if (url) {
        newLink.appendChild(document.createElement("br"));
        var s = document.createElement("a");
        s.setAttribute("href", url);
        s.style.cssText = "color: #808080; font-size: 0.8em;"
        s.appendChild(document.createTextNode(truncate(url, 50)));
        newLink.appendChild(s);

        resolve = true;
    }

    if (des) {
        if (des.localeCompare(title) != 0) {
            newLink.appendChild(document.createElement("br"));
            newLink.appendChild(document.createElement("br"));
            var desc = document.createElement("div");
            if (image) {
                desc.style.cssText = "margin-left: 103px;";
            }
            desc.appendChild(document.createTextNode(truncate(des, 150)));
            newLink.appendChild(desc);

            resolve = true;
        }
    }

    if (resolve) {
        return newLink;
    }
    else {
        return document.createElement("div");
    }
}

function requestContentOnMouse() {
    var target = this;
    GM_xmlhttpRequest({
            method: "GET",
            url: target.href,
            mozAnon: true,
            anonymous: true,
            onload: function(response) {
                var newLink = format(response.responseText, target.href);
                if (newLink.innerHTML != "") {
                    target.parentNode.replaceChild(newLink, target);
                }

            }
     });
}

function requestContent(link) {
    GM_xmlhttpRequest({
            method: "GET",
            url: link.href,
            mozAnon: true,
            anonymous: true,
            onload: function(response) {
                var newLink = format(response.responseText, link.href);
                if (newLink.innerHTML != "") {
                    link.parentNode.replaceChild(newLink, link);
                }
            }
     });
}

function replace(links) {
  for(let link of links) {
      if (auSurvol) {
          link.addEventListener("mouseover", requestContentOnMouse, false);
      }
      else {
          requestContent(link);
      }
  }
}

replace(links);
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