if qrencode is available, display a QR code for the channel viewer

pyweb/mumble/templates/mumble/mumble.html

@@ -105,7 +105,13 @@
                     plugins: [ new Ext.ux.TabScrollerMenu() ],
                     items: [{
                         title: gettext("Server info"),
+                        {% if QRAvailable %}
+                            html:  ('<img src="{% url mumble.views.qrcode MumbleServer.id %}" ' +
+                                    'style="float: right" alt="QR Code for embedded view"/>' +
+                                    renderserverinfos( {{ ServerDict|safe }} ))
+                        {% else %}
                             html:  renderserverinfos( {{ ServerDict|safe }} )
+                        {% endif %}
                     }
                     {% if user.is_authenticated %},
                         {

pyweb/mumble/urls.py

@@ -38,6 +38,7 @@ urlpatterns = patterns(
     ( r'mobile/?$',                          'mobile_mumbles'  ),
 
     ( r'embed/(?P<server>\d+)/?$',           'embed'           ),
+    ( r'qrcode/(?P<server>\d+).png',        'qrcode'           ),
 
     ( r'(?P<server>\d+).json',               'cvp_json'        ),
     ( r'(?P<server>\d+).xml',                'cvp_xml'         ),

pyweb/mumble/views.py

@@ -168,12 +168,20 @@ def show( request, server ):
         regformname = "MumbleUserForm"
         EXT_FORMS_PROVIDER.register_form( MumbleUserForm )
 
+    try:
+        import qrencode
+    except ImportError:
+        qravail = False
+    else:
+        qravail = True
+
     return render_to_response( 'mumble/mumble.html', {
             'MumbleServer': srv,
             'ServerDict':   simplejson.dumps(serverinfo(request, server)),
             'RegForm':      regformname,
             'MumbleActive': True,
             'MumbleAccount':user,
+            'QRAvailable':  qravail,
             'IsAdmin':      isAdmin,
         }, context_instance = RequestContext(request) )
 
@@ -230,6 +238,24 @@ def showTexture( request, server, userid ):
         img.save( buf, "PNG" )
         return HttpResponse( buf.getvalue(), "image/png" )
 
+def qrcode( request, server ):
+    """ Show a QR Coce image that links to the server's embedded page. """
+
+    try:
+        import qrencode
+    except ImportError:
+        return HttpResponse( "oh noez" )
+    else:
+        from django.contrib.sites.models import Site
+        version, size, img = qrencode.encode_scaled( "%s://%s%s" % (
+            { False: "http", True: "https" }[request.is_secure()],
+            Site.objects.get_current().domain,
+            reverse( embed, kwargs={ 'server': server } )
+            ), 100 )
+        buf = StringIO()
+        img.save( buf, "PNG" )
+        return HttpResponse( buf.getvalue(), "image/png" )
+
 @EXT_DIRECT_PROVIDER.register_method( "Mumble" )
 def get_admin( request, server ):
     srv = get_object_or_404( Mumble, id=int(server) )