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1 """ |
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2 Views and functions for serving static files. These are only to be used |
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3 during development, and SHOULD NOT be used in a production setting. |
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4 """ |
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5 |
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6 import mimetypes |
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7 import os |
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8 import posixpath |
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9 import re |
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10 import stat |
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11 import urllib |
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12 from email.Utils import parsedate_tz, mktime_tz |
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13 |
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14 from django.template import loader |
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15 from django.http import Http404, HttpResponse, HttpResponseRedirect, HttpResponseNotModified |
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16 from django.template import Template, Context, TemplateDoesNotExist |
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17 from django.utils.http import http_date |
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18 |
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19 def serve(request, path, document_root=None, show_indexes=False): |
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20 """ |
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21 Serve static files below a given point in the directory structure. |
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22 |
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23 To use, put a URL pattern such as:: |
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24 |
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25 (r'^(?P<path>.*)$', 'django.views.static.serve', {'document_root' : '/path/to/my/files/'}) |
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26 |
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27 in your URLconf. You must provide the ``document_root`` param. You may |
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28 also set ``show_indexes`` to ``True`` if you'd like to serve a basic index |
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29 of the directory. This index view will use the template hardcoded below, |
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30 but if you'd like to override it, you can create a template called |
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31 ``static/directory_index.html``. |
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32 """ |
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33 |
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34 # Clean up given path to only allow serving files below document_root. |
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35 path = posixpath.normpath(urllib.unquote(path)) |
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36 path = path.lstrip('/') |
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37 newpath = '' |
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38 for part in path.split('/'): |
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39 if not part: |
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40 # Strip empty path components. |
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41 continue |
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42 drive, part = os.path.splitdrive(part) |
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43 head, part = os.path.split(part) |
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44 if part in (os.curdir, os.pardir): |
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45 # Strip '.' and '..' in path. |
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46 continue |
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47 newpath = os.path.join(newpath, part).replace('\\', '/') |
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48 if newpath and path != newpath: |
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49 return HttpResponseRedirect(newpath) |
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50 fullpath = os.path.join(document_root, newpath) |
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51 if os.path.isdir(fullpath): |
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52 if show_indexes: |
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53 return directory_index(newpath, fullpath) |
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54 raise Http404("Directory indexes are not allowed here.") |
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55 if not os.path.exists(fullpath): |
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56 raise Http404('"%s" does not exist' % fullpath) |
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57 # Respect the If-Modified-Since header. |
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58 statobj = os.stat(fullpath) |
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59 mimetype = mimetypes.guess_type(fullpath)[0] or 'application/octet-stream' |
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60 if not was_modified_since(request.META.get('HTTP_IF_MODIFIED_SINCE'), |
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61 statobj[stat.ST_MTIME], statobj[stat.ST_SIZE]): |
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62 return HttpResponseNotModified(mimetype=mimetype) |
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63 contents = open(fullpath, 'rb').read() |
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64 response = HttpResponse(contents, mimetype=mimetype) |
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65 response["Last-Modified"] = http_date(statobj[stat.ST_MTIME]) |
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66 response["Content-Length"] = len(contents) |
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67 return response |
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68 |
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69 DEFAULT_DIRECTORY_INDEX_TEMPLATE = """ |
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70 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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71 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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72 <head> |
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73 <meta http-equiv="Content-type" content="text/html; charset=utf-8" /> |
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74 <meta http-equiv="Content-Language" content="en-us" /> |
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75 <meta name="robots" content="NONE,NOARCHIVE" /> |
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76 <title>Index of {{ directory }}</title> |
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77 </head> |
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78 <body> |
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79 <h1>Index of {{ directory }}</h1> |
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80 <ul> |
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81 {% ifnotequal directory "/" %} |
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82 <li><a href="../">../</a></li> |
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83 {% endifnotequal %} |
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84 {% for f in file_list %} |
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85 <li><a href="{{ f|urlencode }}">{{ f }}</a></li> |
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86 {% endfor %} |
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87 </ul> |
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88 </body> |
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89 </html> |
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90 """ |
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91 |
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92 def directory_index(path, fullpath): |
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93 try: |
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94 t = loader.select_template(['static/directory_index.html', |
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95 'static/directory_index']) |
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96 except TemplateDoesNotExist: |
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97 t = Template(DEFAULT_DIRECTORY_INDEX_TEMPLATE, name='Default directory index template') |
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98 files = [] |
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99 for f in os.listdir(fullpath): |
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100 if not f.startswith('.'): |
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101 if os.path.isdir(os.path.join(fullpath, f)): |
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102 f += '/' |
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103 files.append(f) |
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104 c = Context({ |
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105 'directory' : path + '/', |
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106 'file_list' : files, |
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107 }) |
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108 return HttpResponse(t.render(c)) |
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109 |
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110 def was_modified_since(header=None, mtime=0, size=0): |
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111 """ |
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112 Was something modified since the user last downloaded it? |
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113 |
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114 header |
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115 This is the value of the If-Modified-Since header. If this is None, |
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116 I'll just return True. |
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117 |
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118 mtime |
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119 This is the modification time of the item we're talking about. |
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120 |
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121 size |
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122 This is the size of the item we're talking about. |
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123 """ |
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124 try: |
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125 if header is None: |
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126 raise ValueError |
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127 matches = re.match(r"^([^;]+)(; length=([0-9]+))?$", header, |
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128 re.IGNORECASE) |
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129 header_mtime = mktime_tz(parsedate_tz(matches.group(1))) |
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130 header_len = matches.group(3) |
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131 if header_len and int(header_len) != size: |
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132 raise ValueError |
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133 if mtime > header_mtime: |
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134 raise ValueError |
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135 except (AttributeError, ValueError): |
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136 return True |
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137 return False |