Create absmainurl template tag, use for session transfer link

doc/development/implementation/urlconfig.rst

@@ -90,6 +90,10 @@ as its first argument and can be used like this::
     <a href="{% eventurl request.event "presale:event.checkout" step="payment" %}">Pay</a>
     <a href="{% abseventurl request.event "presale:event.checkout" step="payment" %}">Pay</a>
 
+To generate absolute URLs on the main domain, you can use the ``absurl`` template tag::
+
+    {% load eventurl %}
+    <a href="{% absmainurl "control:event.settings" organizer=request.event.organizer event=request.event %}">Event settings</a>
 
 Implementation details
 ----------------------

src/pretix/multidomain/templatetags/eventurl.py

@@ -27,7 +27,7 @@ from django.urls import NoReverseMatch
 from django.utils.encoding import smart_str
 from django.utils.html import conditional_escape
 
-from pretix.multidomain.urlreverse import build_absolute_uri
+from pretix.multidomain.urlreverse import build_absolute_uri, mainreverse
 
 register = template.Library()
 
@@ -45,11 +45,13 @@ class EventURLNode(URLNode):
             for k, v in self.kwargs.items()
         }
         view_name = self.view_name.resolve(context)
-        event = self.event.resolve(context)
+        event = self.event.resolve(context) if self.event is not False else False
         url = ''
         try:
             if self.absolute:
                 url = build_absolute_uri(event, view_name, kwargs=kwargs)
+            elif self.event is False:
+                url = mainreverse(view_name, kwargs)
             else:
                 url = eventreverse(event, view_name, kwargs=kwargs)
         except NoReverseMatch:
@@ -65,21 +67,28 @@ class EventURLNode(URLNode):
             return url
 
 
-@register.tag
-def eventurl(parser, token, absolute=False):
+def multidomainurl(parser, token, has_event, absolute):
     """
     Similar to {% url %} in the same way that eventreverse() is similar to reverse().
 
     Takes an event or organizer object, an url name and optional keyword arguments
     """
     bits = token.split_contents()
-    if len(bits) < 3:
-        raise TemplateSyntaxError("'%s' takes at least two arguments, an event and the name of a url()." % bits[0])
-    viewname = parser.compile_filter(bits[2])
-    event = parser.compile_filter(bits[1])
+    tagname = bits[0]
+    if has_event:
+        if len(bits) < 3:
+            raise TemplateSyntaxError("'%s' takes at least two arguments, an event and the name of a url()." % tagname)
+        viewname = parser.compile_filter(bits[2])
+        event = parser.compile_filter(bits[1])
+        bits = bits[3:]
+    else:
+        if len(bits) < 2:
+            raise TemplateSyntaxError("'%s' takes at least one arguments, the name of a url()." % tagname)
+        viewname = parser.compile_filter(bits[1])
+        event = False
+        bits = bits[2:]
     kwargs = {}
     asvar = None
-    bits = bits[3:]
     if len(bits) >= 2 and bits[-2] == 'as':
         asvar = bits[-1]
         bits = bits[:-2]
@@ -88,16 +97,26 @@ def eventurl(parser, token, absolute=False):
         for bit in bits:
             match = kwarg_re.match(bit)
             if not match:
-                raise TemplateSyntaxError("Malformed arguments to eventurl tag")
+                raise TemplateSyntaxError("Malformed arguments to %s tag" % tagname)
             name, value = match.groups()
             if name:
                 kwargs[name] = parser.compile_filter(value)
             else:
-                raise TemplateSyntaxError('Event urls only have keyword arguments.')
+                raise TemplateSyntaxError('Multidomain urls only have keyword arguments.')
 
     return EventURLNode(event, viewname, kwargs, asvar, absolute)
 
 
+@register.tag
+def eventurl(parser, token):
+    """
+    Similar to {% url %} in the same way that eventreverse() is similar to reverse().
+
+    Takes an event or organizer object, an url name and optional keyword arguments
+    """
+    return multidomainurl(parser, token, has_event=True, absolute=False)
+
+
 @register.tag
 def abseventurl(parser, token):
     """
@@ -105,4 +124,12 @@ def abseventurl(parser, token):
 
     Returns an absolute URL.
     """
-    return eventurl(parser, token, absolute=True)
+    return multidomainurl(parser, token, has_event=True, absolute=True)
+
+
+@register.tag
+def absmainurl(parser, token):
+    """
+    Like {% url %}, but always returns an absolute URL on the main domain.
+    """
+    return multidomainurl(parser, token, has_event=False, absolute=True)

src/pretix/multidomain/urlreverse.py

@@ -180,7 +180,7 @@ def build_absolute_uri(obj, urlname, kwargs=None):
     """
     Works similar to ``eventreverse`` but always returns an absolute URL.
 
-    :param obj: An ``Event`` or ``Organizer`` object
+    :param obj: An ``Event`` or ``Organizer`` object, or ``False`` to generate main domain URLs
     :param name: The name of the URL route
     :type name: str
     :param kwargs: A dictionary of additional keyword arguments that should be used. You do not
@@ -188,7 +188,10 @@ def build_absolute_uri(obj, urlname, kwargs=None):
         needed.
     :returns: An absolute URL (including scheme and host) as a string
     """
-    reversedurl = eventreverse(obj, urlname, kwargs)
+    if obj is False:
+        reversedurl = mainreverse(urlname, kwargs)
+    else:
+        reversedurl = eventreverse(obj, urlname, kwargs)
     if '://' in reversedurl:
         return reversedurl
     return urljoin(settings.SITE_URL, reversedurl)

src/pretix/presale/templates/pretixpresale/event/base.html

@@ -137,6 +137,7 @@
                     <p>
                         {% url "control:event.transfer_session" event=event.slug organizer=event.organizer.slug as time_machine_link %}
                         {% blocktrans trimmed with time_machine_link=time_machine_link %}
+                        {% absmainurl "control:event.transfer_session" event=event.slug organizer=event.organizer.slug as time_machine_link %}
                             To view your shop at different points in time, you can enable
                             <a href="{{ time_machine_link }}"><span class="fa fa-clock-o" aria-hidden="true"></span>time machine</a>.
                         {% endblocktrans %}