annotate MoinMoin/util/send_file.py @ 25:3e888522973b

fix module headers, add missing info, make formatting consistent
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Sun, 27 Feb 2011 16:58:22 +0100
parents 5568cf133caf
children 4cd8edde9e94
rev   line source
0
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1 """
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2 A better send_file
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3 ------------------
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4
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5 Initially, this was a modified implementation of flask 0.6.0's send_file(),
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6 trying to be as compatible as possible.
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7
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8 For details see: https://github.com/mitsuhiko/flask/issues/issue/104 and the
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9 history of this file in our repository. This code fixes all the issues
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10 described in the bug report.
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11
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12 As we forked send_file, we later modified it (without trying to stay
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13 compatible), because we can easily adapt anyway and the code can be much
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14 simpler without compatibility code.
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15
25
3e888522973b fix module headers, add missing info, make formatting consistent
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16 @copyright: 2010 by Armin Ronacher (initial implementation),
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17 2011 by MoinMoin:ThomasWaldmann (modifications)
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18 @license: BSD (see license of flask)
0
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19 """
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20
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21 import os
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22 import mimetypes
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23 from time import time
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24 from zlib import adler32
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25
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26 from werkzeug import Headers, wrap_file
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27 from flask import current_app, request
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28
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29
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30 def send_file(filename=None, file=None,
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31 mimetype=None,
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32 as_attachment=False, attachment_filename=None,
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33 mtime=None, cache_timeout=60 * 60 * 12,
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34 add_etags=True, etag=None, conditional=False):
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35 """Sends the contents of a file to the client.
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36
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37 A file can be either a filesystem file or a file-like object (this code
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38 is careful about not assuming that every file is a filesystem file).
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39
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40 This will use the most efficient method available, configured and possible
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41 (for filesystem files some more optimizations may be possible that for
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42 file-like objects not having a filesystem filename).
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43 By default it will try to use the WSGI server's file_wrapper support.
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44 Alternatively you can set the application's :attr:`~Flask.use_x_sendfile`
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45 attribute to ``True`` to directly emit an `X-Sendfile` header. This
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46 however requires support of the underlying webserver for `X-Sendfile`.
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47
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48 send_file will try to guess some stuff for you if you do not provide them:
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49
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50 * mimetype (based on filename / attachment_filename)
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51 * mtime (based on filesystem file's metadata)
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52 * etag (based on filename, mtime, filesystem file size)
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53
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54 If you do not provide enough information, send_file might raise a
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55 TypeError.
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56
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57 For extra security you probably want to sent certain files as attachment
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58 (HTML for instance).
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59
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60 Please never pass filenames to this function from user sources without
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61 checking them first. Something like this is usually sufficient to
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62 avoid security problems::
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63
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64 if '..' in filename or filename.startswith('/'):
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65 abort(404)
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66
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67 :param filename: the filesystem filename of the file to send (relative to
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68 the :attr:`~Flask.root_path` if a relative path is
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69 specified).
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70 If you just have an open filesystem file object f, give
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71 `f.name` here.
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72 If you don't have a filesystem file nor a filesystem file
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73 name, but just a file-like obj, don't use this argument.
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74 :param file: a file (or file-like) object, you may give it if you either do
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75 not have a filesystem filename or if you already have an open
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76 file anyway.
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77 :param mimetype: the mimetype of the file if provided, otherwise
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78 auto detection happens based on the filename or
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79 attachment_filename.
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80 :param as_attachment: set to `True` if you want to send this file with
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81 a ``Content-Disposition: attachment`` header.
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82 :param attachment_filename: the filename for the attachment if it
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83 differs from the filename argument.
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84 :param mtime: the modification time of the file if provided, otherwise
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85 it will be determined automatically for filesystem files
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86 :param cache_timeout: the timeout in seconds for the headers.
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87 :param conditional: set to `True` to enable conditional responses.
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88 :param add_etags: set to `False` to disable attaching of etags.
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89 :param etag: you can give an etag here, None means to try to compute the
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90 etag from the file's filesystem metadata (the latter of course
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91 only works for filesystem files). If you do not give a
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92 filename, but you use add_etags, you must explicitely provide
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93 the etag as it can't compute it for that case.
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94 """
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95 if filename and not os.path.isabs(filename):
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96 filename = os.path.join(current_app.root_path, filename)
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97
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98 if mimetype is None and (filename or attachment_filename):
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99 mimetype = mimetypes.guess_type(filename or attachment_filename)[0]
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100 if mimetype is None:
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101 mimetype = 'application/octet-stream'
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102
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103 headers = Headers()
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104 if as_attachment:
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105 if attachment_filename is None:
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106 if not filename:
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107 raise TypeError('filename unavailable, required for sending as attachment')
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108 attachment_filename = os.path.basename(filename)
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109 headers.add('Content-Disposition', 'attachment', filename=attachment_filename)
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110
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111 if current_app.use_x_sendfile and filename:
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112 if file:
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113 file.close()
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114 headers['X-Sendfile'] = filename
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115 data = None
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116 else:
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117 if filename:
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118 if not file:
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119 file = open(filename, 'rb')
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120 if mtime is None:
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121 mtime = os.path.getmtime(filename)
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122 data = wrap_file(request.environ, file)
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123
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124 rv = current_app.response_class(data, mimetype=mimetype, headers=headers, direct_passthrough=True)
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125
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126 # if we know the file modification date, we can store it as the
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127 # current time to better support conditional requests. Werkzeug
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128 # as of 0.6.1 will override this value however in the conditional
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129 # response with the current time. This will be fixed in Werkzeug
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130 # with a new release, however many WSGI servers will still emit
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131 # a separate date header.
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132 if mtime is not None:
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133 rv.date = int(mtime)
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134
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135 rv.cache_control.public = True
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136 if cache_timeout:
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137 rv.cache_control.max_age = cache_timeout
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138 rv.expires = int(time() + cache_timeout)
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139
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140 if add_etags:
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141 if etag is None and filename:
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142 etag = 'flask-%s-%s-%s' % (
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143 mtime or os.path.getmtime(filename),
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144 os.path.getsize(filename),
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145 adler32(filename) & 0xffffffff
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146 )
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147 if etag is None:
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148 raise TypeError("can't determine etag - please give etag or filename")
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149 rv.set_etag(etag)
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150 if conditional:
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151 rv = rv.make_conditional(request)
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152 # make sure we don't send x-sendfile for servers that
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153 # ignore the 304 status code for x-sendfile.
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154 if rv.status_code == 304:
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155 rv.headers.pop('x-sendfile', None)
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156 return rv
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157