app/django/views/static.py
author Sverre Rabbelier <srabbelier@gmail.com>
Mon, 02 Nov 2009 16:13:04 +0100
changeset 3071 d11bb8ba0d23
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Set new Melange version number to 0-5-20091102 in app.yaml.template.
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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