Displays a message when an unregistered user tries to annotate

app/assets/javascripts/annotatable.js.coffee

@@ -1,5 +1,20 @@
+_t = (key) -> new Gettext().gettext(key)
+
 App.Annotatable =
   initialize: ->
+    current_user_id = $('html').data('current-user-id')
+    if current_user_id == ""
+      annotator.ui.editor.Editor.template = [
+        '<div class="annotator-outer annotator-editor annotator-hide">',
+        '  <form class="annotator-widget">',
+        '    ' + _t('Unregistered'),
+        '    <div class="annotator-controls">',
+        '      <a href="#cancel" class="annotator-cancel">' + _t('Cancel') + '</a>',
+        '    </div>',
+        '  </form>',
+        '</div>'
+      ].join('\n')
+
     $("[data-annotatable-type]").each ->
       $this       = $(this)
       ann_type    = $this.data("annotatable-type")
@@ -16,7 +31,7 @@ App.Annotatable =
 
 
       app.start().then ->
-        app.ident.identity = $('html').data('current-user-id')
+        app.ident.identity = current_user_id
 
         options = {}
         options[ann_type + "_id"] = ann_id

app/assets/javascripts/gettext.js.coffee

@@ -3,11 +3,13 @@ i18n = {
     "Comments": "Comentarios",
     "Cancel": "Cancelar",
     "Save": "Guardar",
+    "Unregistered": "Necesitas <a href='/users/sign_in'>iniciar sesión</a> o <a href='/users/sign_up'>registratre</a> para continuar."
   },
   en: {
     "Comments": "Coments",
     "Cancel": "Cancel",
     "Save": "Save",
+    "Unregistered": "You need to <a href='/users/sign_in'>sign in</a> or <a href='/users/sign_up'>sign up</a> to continue."
   }
 }