app/django/views/static.py
author Todd Larsen <tlarsen@google.com>
Mon, 27 Oct 2008 19:19:44 +0000
changeset 426 114fe0f840c8
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Add tooltips style display of help_text, instead of widening the form with another (often ridiculously large) column. Also, version the .css and .js files so that browsers won't display the wrong cached one when we change something. Patch by: Dmitri Gaskin, Todd Larsen Review by: Todd Larsen
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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