ニコニコ動画ダウンロードブックマークレット

nicodownload.js

(function(){
  var http_get = function(url) {
    var async = false;
    var req = new XMLHttpRequest();
    req.open("GET", url, async);
    req.withCredentials = true;
    req.send();
    return req.responseText;
  };

  var http_post = function(url, params) {
    var s = encode_params(params);
    var async = false;
    var req = new XMLHttpRequest();
    req.open("POST", url, async);
    req.withCredentials = true;
    req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    req.setRequestHeader("Content-Length", s.length);
    req.send(s);
    return req.responseText;
  };

  var encode_params = function(params) {
    var s = "";
    for (var key in params) {
      s += encodeURIComponent(key) + "=" + encodeURIComponent(params[key]);
    }
    return s;
  };

  var decode_params = function(params) {
    var o = {};
    var a = params.split("&");
    for (var i = 0; i < a.length; i++) {
      var b = a[i].split("=");
      var key = decodeURIComponent(b[0]);
      var value = decodeURIComponent(b[1]);
      o[key] = value;
    }
    return o;
  };

  var download = function(url) {
    var div = document.createElement("div");
    div.innerHTML = '右クリックで保存 <a href="' + url + '">' + url + '</a>';
    document.body.insertBefore(div, document.body.firstChild);
  };

  var getflv = function(id) {
    var url = "http://flapi.nicovideo.jp/api/getflv?v=" + id;
    var t = http_get(url);
    var o = decode_params(t);
    download(o.url);
  };

  getflv(Video.v);

})()