app/django/views/static.py
author Matthew Wilkes <matthew@matthewwilkes.co.uk>
Fri, 15 May 2009 15:29:41 +0200
changeset 2314 0a0e603215d7
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Include required antl3 library and check if datastore is available The datastore is checked for availability before requesting it to be cleared. This is because gaeftest uses its own method for ensuring no leakage of data by providing a temporary file as the backend. Reviewed by: Sverre Rabbelier
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"""
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Views and functions for serving static files. These are only to be used
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during development, and SHOULD NOT be used in a production setting.
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"""
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import mimetypes
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import os
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import posixpath
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import re
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import stat
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import urllib
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from email.Utils import parsedate_tz, mktime_tz
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from django.template import loader
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from django.http import Http404, HttpResponse, HttpResponseRedirect, HttpResponseNotModified
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from django.template import Template, Context, TemplateDoesNotExist
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from django.utils.http import http_date
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def serve(request, path, document_root=None, show_indexes=False):
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    """
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    Serve static files below a given point in the directory structure.
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    To use, put a URL pattern such as::
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        (r'^(?P<path>.*)$', 'django.views.static.serve', {'document_root' : '/path/to/my/files/'})
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    in your URLconf. You must provide the ``document_root`` param. You may
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    also set ``show_indexes`` to ``True`` if you'd like to serve a basic index
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    of the directory.  This index view will use the template hardcoded below,
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    but if you'd like to override it, you can create a template called
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    ``static/directory_index``.
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    """
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    # Clean up given path to only allow serving files below document_root.
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    path = posixpath.normpath(urllib.unquote(path))
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    path = path.lstrip('/')
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    newpath = ''
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    for part in path.split('/'):
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        if not part:
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            # Strip empty path components.
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            continue
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        drive, part = os.path.splitdrive(part)
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        head, part = os.path.split(part)
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        if part in (os.curdir, os.pardir):
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            # Strip '.' and '..' in path.
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            continue
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        newpath = os.path.join(newpath, part).replace('\\', '/')
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    if newpath and path != newpath:
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        return HttpResponseRedirect(newpath)
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    fullpath = os.path.join(document_root, newpath)
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    if os.path.isdir(fullpath):
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        if show_indexes:
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            return directory_index(newpath, fullpath)
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        raise Http404, "Directory indexes are not allowed here."
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    if not os.path.exists(fullpath):
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        raise Http404, '"%s" does not exist' % fullpath
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    # Respect the If-Modified-Since header.
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    statobj = os.stat(fullpath)
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    if not was_modified_since(request.META.get('HTTP_IF_MODIFIED_SINCE'),
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                              statobj[stat.ST_MTIME], statobj[stat.ST_SIZE]):
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        return HttpResponseNotModified()
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    mimetype = mimetypes.guess_type(fullpath)[0] or 'application/octet-stream'
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    contents = open(fullpath, 'rb').read()
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    response = HttpResponse(contents, mimetype=mimetype)
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    response["Last-Modified"] = http_date(statobj[stat.ST_MTIME])
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    response["Content-Length"] = len(contents)
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    return response
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DEFAULT_DIRECTORY_INDEX_TEMPLATE = """
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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  <head>
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    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
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    <meta http-equiv="Content-Language" content="en-us" />
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    <meta name="robots" content="NONE,NOARCHIVE" />
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    <title>Index of {{ directory }}</title>
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  </head>
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  <body>
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    <h1>Index of {{ directory }}</h1>
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    <ul>
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      {% ifnotequal directory "/" %}
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      <li><a href="../">../</a></li>
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      {% endifnotequal %}
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      {% for f in file_list %}
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      <li><a href="{{ f|urlencode }}">{{ f }}</a></li>
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      {% endfor %}
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    </ul>
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  </body>
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</html>
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"""
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def directory_index(path, fullpath):
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    try:
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        t = loader.get_template('static/directory_index')
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    except TemplateDoesNotExist:
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        t = Template(DEFAULT_DIRECTORY_INDEX_TEMPLATE, name='Default directory index template')
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    files = []
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    for f in os.listdir(fullpath):
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        if not f.startswith('.'):
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            if os.path.isdir(os.path.join(fullpath, f)):
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                f += '/'
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            files.append(f)
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    c = Context({
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        'directory' : path + '/',
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        'file_list' : files,
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    })
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    return HttpResponse(t.render(c))
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def was_modified_since(header=None, mtime=0, size=0):
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    """
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    Was something modified since the user last downloaded it?
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    header
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      This is the value of the If-Modified-Since header.  If this is None,
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      I'll just return True.
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    mtime
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      This is the modification time of the item we're talking about.
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    size
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      This is the size of the item we're talking about.
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    """
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    try:
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        if header is None:
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            raise ValueError
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        matches = re.match(r"^([^;]+)(; length=([0-9]+))?$", header,
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                           re.IGNORECASE)
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        header_mtime = mktime_tz(parsedate_tz(matches.group(1)))
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        header_len = matches.group(3)
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        if header_len and int(header_len) != size:
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            raise ValueError
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        if mtime > header_mtime:
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            raise ValueError
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    except (AttributeError, ValueError):
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        return True
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    return False