Ticket #1457: django_if_modified_since_svn.diff

File django_if_modified_since_svn.diff, 2.9 KB (added by jjinux@…, 20 years ago)

patch

  • static.py

     
    22import urllib
    33import posixpath
    44import mimetypes
     5import re
     6import rfc822
     7import stat
    58from django.core import template_loader
    69from django.core.exceptions import Http404, ImproperlyConfigured
    7 from django.utils.httpwrappers import HttpResponse, HttpResponseRedirect
     10from django.utils.httpwrappers import HttpResponse, HttpResponseRedirect, \
     11                                      HttpResponseNotModified
    812from django.core.template import Template, Context, TemplateDoesNotExist
    913
    1014def serve(request, path, document_root=None, show_indexes=False):
    … …  
    4145    if os.path.isdir(fullpath):
    4246        if show_indexes:
    4347            return directory_index(newpath, fullpath)
    44         else:
    45             raise Http404, "Directory indexes are not allowed here."
    46     elif not os.path.exists(fullpath):
     48        raise Http404, "Directory indexes are not allowed here."
     49    if not os.path.exists(fullpath):
    4750        raise Http404, '"%s" does not exist' % fullpath
    48     else:
    49         mimetype = mimetypes.guess_type(fullpath)[0]
    50         return HttpResponse(open(fullpath, 'rb').read(), mimetype=mimetype)
     51    # Respect the If-Modified-Since header.
     52    statobj = os.stat(fullpath)
     53    if not was_modified_since(request.META.get('HTTP_IF_MODIFIED_SINCE'),
     54                              statobj[stat.ST_MTIME], statobj[stat.ST_SIZE]):
     55        return HttpResponseNotModified()
     56    mimetype = mimetypes.guess_type(fullpath)[0]
     57    contents = open(fullpath, 'rb').read()
     58    response = HttpResponse(contents, mimetype=mimetype)
     59    response["Last-Modified"] = rfc822.formatdate(statobj[stat.ST_MTIME])
     60    return response
    5161
    5262DEFAULT_DIRECTORY_INDEX_TEMPLATE = """
    5363<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    … …  
    8595        'file_list' : files,
    8696    })
    8797    return HttpResponse(t.render(c))
     98
     99def was_modified_since(header=None, mtime=0, size=0):
     100    """
     101    Was something modified since the user last downloaded it?
     102
     103    header
     104      This is the value of the If-Modified-Since header.  If this is None,
     105      I'll just return True.
     106
     107    mtime
     108      This is the modification time of the item we're talking about.
     109
     110    size
     111      This is the size of the item we're talking about.
     112    """
     113    try:
     114        if header is None:
     115            raise ValueError
     116        matches = re.match(r"^([^;]+)(; length=([0-9]+))?$", header,
     117                           re.IGNORECASE)
     118        header_mtime = rfc822.mktime_tz(rfc822.parsedate_tz(
     119            matches.group(1)))
     120        header_len = matches.group(3)
     121        if header_len and int(header_len) != size:
     122            raise ValueError
     123        if mtime > header_mtime:
     124            raise ValueError
     125    except (AttributeError, ValueError):
     126        return True
     127    return False
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