gregnewman / django-cachebuster
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Description: tag helpers to generate javascript and css tags with a cachebuster
Homepage: http://20seven.org/journal/2008/09/django-cachebuster.html
Clone URL: git://github.com/gregnewman/django-cachebuster.git
django-cachebuster / tag_helper.py
100755 56 lines (39 sloc) 1.31 kb
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""" 
This will return the filename with the cachebuster apppended 
 
Useage::
    {% js_tag 'test.js' %}
        or 
    {% js_tag 'test' %}
 
Returns::
    test.js?188a8a2c905fac2670ec4b254d40dadcc7f93f7a
 
    Author: Greg Newman > greg@20seven.org
"""
from django import template
from django.conf import settings
import hashlib
import time
import datetime
import os
from distutils.dir_util import mkpath
 
 
def _cleanfilename(filename):
    
    return os.path.splitext(filename)[0]
 
def _getfiletime(filename):
    basedir = "%s/" % (settings.MEDIA_ROOT)
    if os.path.exists(basedir + "/" + filename):
        return os.path.getmtime(basedir + "/" + filename)
    else:
        return ""
 
def _hashit(filename):
    cb = hashlib.sha1()
    cb.update(_cleanfilename(filename))
    cb.update(str(_getfiletime(filename)))
    
    return str(cb.hexdigest())
 
def js_tag(filename):
    tag = "<script src=\"%s%s\" type=\"text/javascript\"></script>" % (settings.MEDIA_URL, _cleanfilename(filename) + ".js?" + _hashit(filename))
    
    return tag 
 
def css_tag(filename):
    tag = "<link rel=\"stylesheet\" href=\"%s%s\" />" % (settings.MEDIA_URL, _cleanfilename(filename) + ".css?" + _hashit(filename))
 
    return tag
 
register = template.Library()
register.simple_tag(js_tag)
register.simple_tag(css_tag)