Propane hack to expand spotify artist and album urls to embedded players.

caveatPatchor.js

// Display Spotify songs inline

if (displaySpotifySongs) {

  Campfire.SpotifyExpander = Class.create({
    initialize: function(chat) {
      this.chat = chat;
      var messages = this.chat.transcript.messages;
      for (var i = 0; i < messages.length; i++) {
        this.detectSpotifyURL(messages[i]);
      }
    },

    detectSpotifyURL: function(message) {
      if (!message.pending() && message.kind === 'text') {
        var links = message.bodyElement().select('a:not(image)');
        if (links.length != 1) {
          return;
        }
        var href = links[0].getAttribute('href');
        var match = href.match(/^(http:\/\/|spotify:).*(track|album)(\/|:)(.*)$/);
        if (!match) return;
        message.resize((function() {
          message.bodyCell.insert({bottom: '<iframe src="https://embed.spotify.com/?uri=spotify:' + match[2] + ':' + match[4] + '" width="300" height="80" frameborder="0" allowtransparency="true" ></iframe>'});
        }))
      }
    },

    onMessagesInsertedBeforeDisplay: function(messages) {
      for (var i = 0; i < messages.length; i++) {
        this.detectSpotifyURL(messages[i]);
      }
    },

    onMessageAccepted: function(message, messageID) {
      this.detectSpotifyURL(message);
    }
  });

  Campfire.Responders.push("SpotifyExpander");
  window.chat.installPropaneResponder("SpotifyExpander", "spotifyexpander");
}