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Download arxiv pdf and rename it with title

下载并用文章标题命名arxiv的pdf，支持arxiv.org/pdf/xx.pdf 和 cn.arxiv.org/pdf/xx.pdf两种页面，按 Ctrl+S 触发下载。Automatially download an opened arxiv pdf file and rename it with its title. Work on pages like arxiv.org/pdf/xx.pdf or cn.arxiv.org/pdf/xx.pdf. Press Ctrl+S to trigger.

目前為 2018-07-19 提交的版本，檢視 最新版本。

// ==UserScript==
// @name         Download arxiv pdf and rename it with title
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  下载并用文章标题命名arxiv的pdf，支持arxiv.org/pdf/xx.pdf 和 cn.arxiv.org/pdf/xx.pdf两种页面，按 Ctrl+S 触发下载。Automatially download an opened arxiv pdf file and rename it with its title. Work on pages like arxiv.org/pdf/xx.pdf or cn.arxiv.org/pdf/xx.pdf. Press Ctrl+S to trigger. 
// @author       LTGuo
// @include      http://cn.arxiv.org/pdf/*
// @include      https://arxiv.org/pdf/*
// @grant        none
// ==/UserScript==

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function download(){
    var url = window.location.href
    if (/pdf/i.test(url.slice(-3))
        || document.querySelectorAll("embed")[0].type === "application/pdf") {
        var url_ = url.split('/');
        var abs_url = url.slice(0,-4).replace('pdf', 'abs')
        // var abs_url = "https://arxiv.org/abs/" + url_[url_.length-1].slice(0,-4);
        console.log("Abs url: " + abs_url)
        var xhr1 = new XMLHttpRequest();
        xhr1.open("GET", abs_url, true)
        xhr1.onload = function(e) {
          if (xhr1.status === 200) {
            var text = xhr1.response;
            text = text.replace(/(\r\n\t|\n|\r\t)/gm,"");
            // console.log(text);
            var regex = /Title:<\/span>(.*)<\/h1><div class="authors">/gm;
            var match = regex.exec(text);
            if (match != null){
              var title = match[1];
              title = title.replace(/[<>:"/\\|?*]/g, " ");
              console.log("title: "+title);


              var xhr2 = new XMLHttpRequest();
              // load `document` from `cache`
              xhr2.open("GET", "", true);
              xhr2.responseType = "blob";
              xhr2.onload = function (e) {
                  if (xhr2.status === 200) {
                      // `blob` response
                      var file = window.URL.createObjectURL(xhr2.response);
                      var a = document.createElement("a");
                      a.href = file;
                      a.download = title+'.pdf';
                      document.body.appendChild(a);
                      a.click();
                      // remove `a` following `Save As` dialog,
                      // `window` regains `focus`
                  };
              };
              xhr2.send();
            };
          };
        };
        xhr1.send();
        console.log("send");
    };
}

hotkeys('ctrl+s', function(event,handler) {

  switch(handler.key){
    case "ctrl+s": console.log('you pressed ctrl+s!'); event.preventDefault(); download(); break;
  }
});