Bookmarklet that generates download link for a Soundcloud upload

sc-dl-min.js

(function(a){function b(a){var b=$.helpers,f=b.getPlayerTrack(b.getPlayerNode(a)),g=a.find(".actionbar");if(!f){return}if(a.hasClass("player")){if(g.length){c(f,g)}else{d(f,a)}}else{e(f,a)}}function c(a,b){var c=b.find(".download, .mock-download");if(!c.length||c.hasClass("disabled")){var d=$('<a class="pl-button mock-download"><span>Download</span></a>').css({backgroundImage:"url(http://soundcloud.com/images/icons_mini.png?unicorn26)",backgroundRepeat:"no-repeat",backgroundPosition:"-77px -236px",paddingLeft:"18px"}).attr("download",a.title+".mp3");b.find(".primary").append(d);d.attr("href",a.streamUrl)}}function d(a,b){var d=null;if(b.hasClass("nano")){d=f(b.closest(".track-title").find(".track")).css({marginLeft:"18px"})}else if(b.hasClass("small")){d=f(b.find(".container"))}if(d){c(a,d)}}function e(a,b){var c=b.find(".actions"),d=c.find(".download");if(!d.length){c.prepend('<a href="'+a.streamUrl+'" class="download pl-button" download="'+a.title+'" title="'+a.title+'">Download track</a>')}}function f(a){var b=a.find(".actionbar");if(b.length){return b}else{return a.prepend('<div class="actionbar"><div class="actions"><div class="primary"></div></div></div>')}}var g,h,i=a.querySelectorAll("[data-sc-track]");for(g=0,h=i.length;g<h;g++){b($(i[g]))}})(document)

sc-dl.js

(function(document) {
  function extend(node) {
    var helpers   = $.helpers,
        trackData = helpers.getPlayerTrack(helpers.getPlayerNode(node)),
        actionbar = node.find(".actionbar");

    if (!trackData) { return; }

    if (node.hasClass("player")) {
      if (actionbar.length) {
        extendPlayerWithActionbar(trackData, actionbar);
      } else {
        extendPlayerWithoutActionbar(trackData, node);
      }
    } else {
      // Not a player, so must be a playlist entry
      extendPlaylistEntry(trackData, node);
    }
  }

  function extendPlayerWithActionbar(trackData, actionbar) {
    var downloadButton = actionbar.find(".download, .mock-download");

    // No need to add a button for players that already have one
    if ((!downloadButton.length) || (downloadButton.hasClass("disabled"))) {
      var link = $("<a class=\"pl-button mock-download\"><span>Download</span></a>").css({
        backgroundImage:    "url(http://soundcloud.com/images/icons_mini.png?unicorn26)",
        backgroundRepeat:   "no-repeat",
        backgroundPosition: "-77px -236px",
        paddingLeft:        "18px"
      }).attr("download", trackData.title + ".mp3");

      actionbar.find(".primary").append(link);

      link.attr("href", trackData.streamUrl);
    }
  }

  function extendPlayerWithoutActionbar(trackData, player) {
    var actionbar = null;

    if (player.hasClass("nano")) {
      actionbar = addActionbar(player.closest(".track-title").find(".track")).css({ marginLeft: "18px" });
    } else if (player.hasClass("small")) {
      actionbar = addActionbar(player.find(".container"));
    }

    if (actionbar) {
      extendPlayerWithActionbar(trackData, actionbar);
    }
  }

  function extendPlaylistEntry(trackData, node) {
    var actions = node.find(".actions"),
        downloadLink = actions.find(".download");

    if (!downloadLink.length) {
      actions.prepend("<a href=\"" + trackData.streamUrl + "\" class=\"download pl-button\" download=\"" + trackData.title + "\" title=\"" + trackData.title + "\">Download track</a>");
    }
  }

  function addActionbar(node) {
    var actionbar = node.find(".actionbar");

    if (actionbar.length) {
      return actionbar;
    } else {
      return node.prepend("<div class=\"actionbar\"><div class=\"actions\"><div class=\"primary\"></div></div></div>");
    }
  }

  var i, l, tracks = document.querySelectorAll("[data-sc-track]");

  for (i = 0, l = tracks.length; i < l; i++) {
    extend($(tracks[i]));
  }
})(document);

Fixed for tracks that have a download button but have reached the download limit (eg http://soundcloud.com/polarisatnoon/ko-ko-float-polaris-at-noon)