[extensions-web] Rewrite gravatar template tag to use Library.simple_tag and SSL

[Jasper St. Pierre <jstpierre src gnome org>]

commit baf3f21ac99a6894b591cce48e01d9a11d7bab8a
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Wed Oct 26 13:45:28 2011 -0400

    Rewrite gravatar template tag to use Library.simple_tag and SSL

 sweettooth/extensions/templatetags/gravatar.py |   43 +++--------------------
 1 files changed, 6 insertions(+), 37 deletions(-)
---
diff --git a/sweettooth/extensions/templatetags/gravatar.py b/sweettooth/extensions/templatetags/gravatar.py
index 71346b5..6014513 100644
--- a/sweettooth/extensions/templatetags/gravatar.py
+++ b/sweettooth/extensions/templatetags/gravatar.py
@@ -1,43 +1,12 @@
-### gravatar.py ###############
-### place inside a 'templatetags' directory inside the top level of a Django app (not project, must be inside an app)
-### at the top of your page template include this:
-### {% load gravatar %}
-### and to use the url do this:
-### <img src="{% gravatar_url someone somewhere com %}">
-### or
-### <img src="{% gravatar_url some_template_variable %}">
-### just make sure to update the "default" image path below
-
 from django import template
 import urllib, hashlib
 
 register = template.Library()
 
-class GravatarUrlNode(template.Node):
-    def __init__(self, email, size):
-        self.email = template.Variable(email)
-        self.size = size
-
-    def render(self, context):
-        try:
-            email = self.email.resolve(context)
-        except template.VariableDoesNotExist:
-            return ''
-
-        default = "http://planet.gnome.org/heads/nobody.png";
-
-        gravatar_url = "http://www.gravatar.com/avatar/"; + hashlib.md5(email.lower()).hexdigest() + "?"
-        gravatar_url += urllib.urlencode({'d':default, 's':str(self.size)})
-
-        return gravatar_url
-
- register tag
-def gravatar_url(parser, token):
-    try:
-        # Default of 70 px
-        tag_name, email, size = (token.split_contents() + [70])[:3]
-
-    except ValueError:
-        raise template.TemplateSyntaxError, "%r tag requires one or two arguments" % token.contents.split()[0]
+GRAVATAR_BASE = "https://secure.gravatar.com/avatar/%s?%s";
 
-    return GravatarUrlNode(email, size)
+ register simple_tag
+def gravatar_url(email, size=70, default="http://planet.gnome.org/heads/nobody.png";):
+    email_md5 = hashlib.md5(email.lower()).hexdigest()
+    options = urllib.urlencode(dict(d=default, s=size))
+    return GRAVATAR_BASE % (email_md5, options)