1 files changed, 56 insertions, 0 deletions

diff --git a/assets/js/watch.js b/assets/js/watch.js
index 99500686..81fa6288 100644
--- a/assets/js/watch.js
+++ b/assets/js/watch.js
@@ -50,3 +50,59 @@ function hide_youtube_replies(target) {
   target.innerHTML = "Show replies";
   target.setAttribute("onclick", "show_youtube_replies(this)");
 }
+
+function download_video(target) {
+  var title = target.getAttribute("data-title");
+  var children = document.getElementById("download_widget").children;
+  var progress = document.getElementById("download-progress");
+  var url = "";
+
+  document.getElementById("progress-container").style.display = "";
+
+  for (i = 0; i < children.length; i++) {
+    if (children[i].selected) {
+      url = children[i].getAttribute("data-url");
+    }
+  }
+
+  url = "/videoplayback" + url.split("/videoplayback")[1];
+
+  var xhr = new XMLHttpRequest();
+  xhr.open("GET", url);
+  xhr.responseType = "arraybuffer";
+  
+  xhr.onprogress = function(event) {
+    if (event.lengthComputable) {
+      progress.style.width = "" + (event.loaded / event.total)*100 + "%";
+    }
+  };
+
+  xhr.onload = function(event) {
+    if (event.currentTarget.status != 200) {
+      console.log("Downloading " + title + " failed.")
+      document.getElementById("progress-container").style.display = "none";
+      progress.style.width = "0%";
+
+      return;
+    }
+
+    var data = new Blob([xhr.response], {'type' : 'video/mp4'});
+    var videoFile = window.URL.createObjectURL(data);
+
+    var link = document.createElement('a');
+    link.href = videoFile;
+    link.setAttribute('download', title);
+    document.body.appendChild(link);
+
+    window.requestAnimationFrame(function() {
+      var event = new MouseEvent('click');
+      link.dispatchEvent(event);
+      document.body.removeChild(link);
+    });
+
+    document.getElementById("progress-container").style.display = "none";
+    progress.style.width = "0%";
+  };
+
+  xhr.send(null);
+}
\ No newline at end of file