Vulcan/packages/telescope-module-embedly/lib/server/get_thumbnail_url.js

getThumbnailUrl = function (url) {
  var extractBase = 'http://api.embed.ly/1/extract';
  var embedlyKey = getSetting('embedlyKey');

  try {
    
    if(!embedlyKey)
      throw new Error("Couldn't find an Embedly API key! Please add it to your Telescope settings.")

    var result = Meteor.http.get(extractBase, {
      params: {
        key: embedlyKey,
        url: url,
        image_width: 200
      }
    });

    if(!result.data.images.length)
      throw new Error("Couldn't find an image!");

    var thumbnailUrl = result.data.images[0].url;

    return thumbnailUrl;
  } catch (error) {
    console.log(error)
    return null;
  }
}

Meteor.methods({
  testGetThumbnailUrl: function (url) {
    console.log(getThumbnailUrl(url))
  }
});

var extendPost = function (post) {
  if(post.url){
    var thumbnailUrl = getThumbnailUrl(post.url);
    if(thumbnailUrl)
      post.thumbnailUrl = thumbnailUrl;
  }
  return post;
}

postSubmitServerCallbacks.push(extendPost);