Support HTTPS based redirects.

niche.py

@@ -77,7 +77,6 @@ DEFAULTS = [
     ('general', {
             'dateformat': '%B %d, %Y',
             'base': '/',
-            'domain': None,
             'has_https': False,
             'extra_tags': '',
             'limit': 20,
@@ -455,6 +454,9 @@ class Model:
 
         return first_or_none('user', 'userID', id)
 
+    def is_active(self):
+        return session.get('userID', None) is not None
+
     def paginate(self, offset, total, per_page):
         # TODO(michaelh): really a helper, not part of the model.
         page = 1 + offset // per_page
@@ -612,7 +614,17 @@ def url_validator(v):
 
 def redirect(url):
     """Bounce to a different site absolute URL."""
-    raise web.seeother(url)
+    has_https = config.get('general', 'has_https')
+    if has_https and model.is_active():
+        base = config.get('general', 'base')
+        if base.endswith('/') and url.startswith('/'):
+            path = base[:-1] + url
+        else:
+            path = base + url
+
+        raise web.seeother('https://{host}{path}'.format(host=web.ctx.host, path=path), absolute=True)
+    else:
+        raise web.seeother(url)
 
 
 def authenticate(msg=_("Login required")):