Fix the size of the embed widget when embedding public recording via private URL

app/assets/javascripts/widget.js

@@ -70,9 +70,11 @@
 
     function receiveSize(e) {
       if (e.origin === apiHost) {
-        var event = e.data[0];
+        var name = e.data[0];
         var data  = e.data[1];
-        if (event == 'asciicast:size' && data.id == asciicastId) {
+        var iframeWindow = iframe.contentWindow || iframe;
+
+        if (e.source == iframeWindow && name == 'asciicast:size') {
           iframe.style.width  = '' + data.width + 'px';
           iframe.style.height = '' + data.height + 'px';
         }

app/presenters/bare_asciicast_page_presenter.rb

@@ -17,8 +17,4 @@ class BareAsciicastPagePresenter
     @playback_options = playback_options
   end
 
-  def asciicast_id
-    asciicast.to_param
-  end
-
 end

app/views/api/asciicasts/show.html.slim

@@ -9,7 +9,7 @@ javascript:
     if (typeof target != "undefined" && window !== window.parent) {
       var w = $('.asciinema-player').width();
       var h = $(document).height();
-      target.postMessage(['asciicast:size', { id: '#{page.asciicast_id}', width: w, height: h }], '*');
+      target.postMessage(['asciicast:size', { width: w, height: h }], '*');
     }
 
     function onMessage(e) {

app/views/asciicasts/example.html.slim

@@ -10,7 +10,7 @@ p
 p
   ' And now again. There should be an embedded player below this paragraph.
 
-= embed_script(@asciicast).html_safe
+= embed_script(Asciicast.where('id <> ?', @asciicast.id).first || @asciicast).html_safe
 
 p
   ' This is at the bottom of the page, below all players.

spec/presenters/bare_asciicast_page_presenter_spec.rb

@@ -19,13 +19,4 @@ describe BareAsciicastPagePresenter do
     end
   end
 
-  let(:presenter) { described_class.new(asciicast, nil) }
-  let(:asciicast) { stub_model(Asciicast, id: 123) }
-
-  describe '#asciicast_id' do
-    subject { presenter.asciicast_id }
-
-    it { should eq('123') }
-  end
-
 end