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annotate mercurial/hgweb/common.py @ 31444:2daeab02b4b1

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hgweb: explicitly tests for None Changeset 7dafa8d0e006 removed the mutable default value, but did not explicitly tested for None. Such implicit testing can introduce semantic and performance issue. We move to an explicit testing for None as recommended by PEP8: https://www.python.org/dev/peps/pep-0008/#programming-recommendations
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
date Wed, 15 Mar 2017 15:11:04 -0700
parents 7dafa8d0e006
children 161a87ed456e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # hgweb/common.py - Utility functions needed by hgweb_mod and hgwebdir_mod
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2 #
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3 # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>
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4 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8
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9 from __future__ import absolute_import
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10
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11 import base64
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12 import errno
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13 import mimetypes
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14 import os
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15 import uuid
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16
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17 from .. import (
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18 encoding,
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19 pycompat,
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20 util,
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21 )
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23 httpserver = util.httpserver
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24
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25 HTTP_OK = 200
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26 HTTP_NOT_MODIFIED = 304
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27 HTTP_BAD_REQUEST = 400
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28 HTTP_UNAUTHORIZED = 401
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29 HTTP_FORBIDDEN = 403
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30 HTTP_NOT_FOUND = 404
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31 HTTP_METHOD_NOT_ALLOWED = 405
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32 HTTP_SERVER_ERROR = 500
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33
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34
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35 def ismember(ui, username, userlist):
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36 """Check if username is a member of userlist.
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37
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38 If userlist has a single '*' member, all users are considered members.
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39 Can be overridden by extensions to provide more complex authorization
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40 schemes.
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41 """
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42 return userlist == ['*'] or username in userlist
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43
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44 def checkauthz(hgweb, req, op):
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45 '''Check permission for operation based on request data (including
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46 authentication info). Return if op allowed, else raise an ErrorResponse
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47 exception.'''
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48
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49 user = req.env.get('REMOTE_USER')
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50
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51 deny_read = hgweb.configlist('web', 'deny_read')
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52 if deny_read and (not user or ismember(hgweb.repo.ui, user, deny_read)):
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53 raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized')
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54
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55 allow_read = hgweb.configlist('web', 'allow_read')
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56 if allow_read and (not ismember(hgweb.repo.ui, user, allow_read)):
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57 raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized')
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58
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59 if op == 'pull' and not hgweb.allowpull:
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60 raise ErrorResponse(HTTP_UNAUTHORIZED, 'pull not authorized')
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61 elif op == 'pull' or op is None: # op is None for interface requests
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62 return
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63
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64 # enforce that you can only push using POST requests
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65 if req.env['REQUEST_METHOD'] != 'POST':
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66 msg = 'push requires POST request'
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67 raise ErrorResponse(HTTP_METHOD_NOT_ALLOWED, msg)
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68
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69 # require ssl by default for pushing, auth info cannot be sniffed
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70 # and replayed
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71 scheme = req.env.get('wsgi.url_scheme')
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72 if hgweb.configbool('web', 'push_ssl', True) and scheme != 'https':
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73 raise ErrorResponse(HTTP_FORBIDDEN, 'ssl required')
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74
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75 deny = hgweb.configlist('web', 'deny_push')
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76 if deny and (not user or ismember(hgweb.repo.ui, user, deny)):
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77 raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized')
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78
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79 allow = hgweb.configlist('web', 'allow_push')
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80 if not (allow and ismember(hgweb.repo.ui, user, allow)):
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81 raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized')
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82
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83 # Hooks for hgweb permission checks; extensions can add hooks here.
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84 # Each hook is invoked like this: hook(hgweb, request, operation),
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85 # where operation is either read, pull or push. Hooks should either
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86 # raise an ErrorResponse exception, or just return.
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87 #
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88 # It is possible to do both authentication and authorization through
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89 # this.
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90 permhooks = [checkauthz]
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92
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93 class ErrorResponse(Exception):
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94 def __init__(self, code, message=None, headers=None):
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95 if message is None:
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96 message = _statusmessage(code)
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97 Exception.__init__(self, message)
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98 self.code = code
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99 if headers is None:
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100 headers = []
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101 self.headers = headers
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102
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103 class continuereader(object):
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104 def __init__(self, f, write):
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105 self.f = f
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106 self._write = write
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107 self.continued = False
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108
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109 def read(self, amt=-1):
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110 if not self.continued:
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111 self.continued = True
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112 self._write('HTTP/1.1 100 Continue\r\n\r\n')
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113 return self.f.read(amt)
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114
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115 def __getattr__(self, attr):
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116 if attr in ('close', 'readline', 'readlines', '__iter__'):
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117 return getattr(self.f, attr)
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118 raise AttributeError
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119
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120 def _statusmessage(code):
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121 responses = httpserver.basehttprequesthandler.responses
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122 return responses.get(code, ('Error', 'Unknown error'))[0]
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123
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124 def statusmessage(code, message=None):
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125 return '%d %s' % (code, message or _statusmessage(code))
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126
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127 def get_stat(spath, fn):
46e2c57026bc hgweb: drop the default argument for get_stat
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 25660
diff changeset
128 """stat fn if it exists, spath otherwise"""
22577
a111e460318a hgweb: refresh hgweb.repo on phase change (issue4061)
Anton Shestakov <engored@ya.ru>
parents: 19951
diff changeset
129 cl_path = os.path.join(spath, fn)
3853
c0b449154a90 switch to the .hg/store layout, fix the tests
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 3276
diff changeset
130 if os.path.exists(cl_path):
13958
71f51cc71652 hgweb: detect change based on changelog size too
Martin Geisler <mg@lazybytes.net>
parents: 13444
diff changeset
131 return os.stat(cl_path)
1418
68f81ba07b2a Make hgweb work when the repository is empty (no 00changelog.i)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 1416
diff changeset
132 else:
13958
71f51cc71652 hgweb: detect change based on changelog size too
Martin Geisler <mg@lazybytes.net>
parents: 13444
diff changeset
133 return os.stat(spath)
71f51cc71652 hgweb: detect change based on changelog size too
Martin Geisler <mg@lazybytes.net>
parents: 13444
diff changeset
134
71f51cc71652 hgweb: detect change based on changelog size too
Martin Geisler <mg@lazybytes.net>
parents: 13444
diff changeset
135 def get_mtime(spath):
25717
46e2c57026bc hgweb: drop the default argument for get_stat
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 25660
diff changeset
136 return get_stat(spath, "00changelog.i").st_mtime
1418
68f81ba07b2a Make hgweb work when the repository is empty (no 00changelog.i)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 1416
diff changeset
137
2514
419c42223bee Really fix http headers for web UI and issue 254.
Eric Hopper <hopper@omnifarious.org>
parents: 2391
diff changeset
138 def staticfile(directory, fname, req):
5930
c301f15c965a send conservatively capitalized HTTP headers
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 5779
diff changeset
139 """return a file inside directory with guessed Content-Type header
1825
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
140
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
141 fname always uses '/' as directory separator and isn't allowed to
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
142 contain unusual path components.
5930
c301f15c965a send conservatively capitalized HTTP headers
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 5779
diff changeset
143 Content-Type is guessed using the mimetypes module.
1825
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
144 Return an empty string if fname is illegal or file not found.
1793
83c6d8355909 Allow serving static files from hgwebdir to fix CSS and favicon.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1792
diff changeset
145
1825
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
146 """
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
147 parts = fname.split('/')
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
148 for part in parts:
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
149 if (part in ('', os.curdir, os.pardir) or
30620
bb77654dc7ae py3: replace os.sep with pycompat.ossep (part 3 of 4)
Pulkit Goyal <7895pulkit@gmail.com>
parents: 29566
diff changeset
150 pycompat.ossep in part or
30630
bcf4a975f93d py3: replace os.altsep with pycompat.altsep
Pulkit Goyal <7895pulkit@gmail.com>
parents: 30620
diff changeset
151 pycompat.osaltsep is not None and pycompat.osaltsep in part):
18645
76ff3a715cf2 hgweb: simplify internal staticfile return codes
Mads Kiilerich <mads@kiilerich.com>
parents: 18352
diff changeset
152 return
7288
9c399c53469d Allow per-file shadowing of static directory in templatepath
Brendan Cully <brendan@kublai.com>
parents: 7107
diff changeset
153 fpath = os.path.join(*parts)
9c399c53469d Allow per-file shadowing of static directory in templatepath
Brendan Cully <brendan@kublai.com>
parents: 7107
diff changeset
154 if isinstance(directory, str):
9c399c53469d Allow per-file shadowing of static directory in templatepath
Brendan Cully <brendan@kublai.com>
parents: 7107
diff changeset
155 directory = [directory]
9c399c53469d Allow per-file shadowing of static directory in templatepath
Brendan Cully <brendan@kublai.com>
parents: 7107
diff changeset
156 for d in directory:
9c399c53469d Allow per-file shadowing of static directory in templatepath
Brendan Cully <brendan@kublai.com>
parents: 7107
diff changeset
157 path = os.path.join(d, fpath)
9c399c53469d Allow per-file shadowing of static directory in templatepath
Brendan Cully <brendan@kublai.com>
parents: 7107
diff changeset
158 if os.path.exists(path):
9c399c53469d Allow per-file shadowing of static directory in templatepath
Brendan Cully <brendan@kublai.com>
parents: 7107
diff changeset
159 break
1793
83c6d8355909 Allow serving static files from hgwebdir to fix CSS and favicon.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1792
diff changeset
160 try:
1825
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
161 os.stat(path)
a9343f9d7365 Make hgweb.staticfile() more secure and portable.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 1796
diff changeset
162 ct = mimetypes.guess_type(path)[0] or "text/plain"
13400
14f3795a5ed7 explicitly close files
Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents: 12183
diff changeset
163 fp = open(path, 'rb')
14f3795a5ed7 explicitly close files
Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents: 12183
diff changeset
164 data = fp.read()
14f3795a5ed7 explicitly close files
Dan Villiom Podlaski Christiansen <danchr@gmail.com>
parents: 12183
diff changeset
165 fp.close()
18352
e33b9b92a200 hgweb: pass the actual response body to request.response, not just the length
Mads Kiilerich <mads@kiilerich.com>
parents: 17456
diff changeset
166 req.respond(HTTP_OK, ct, body=data)
5561
22713dce19f6 hgweb: return meaningful HTTP status codes instead of nonsense
Bryan O'Sullivan <bos@serpentine.com>
parents: 4462
diff changeset
167 except TypeError:
8761
0289f384e1e5 Generally replace "file name" with "filename" in help and comments.
timeless <timeless@gmail.com>
parents: 8225
diff changeset
168 raise ErrorResponse(HTTP_SERVER_ERROR, 'illegal filename')
25660
328739ea70c3 global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents: 22577
diff changeset
169 except OSError as err:
5561
22713dce19f6 hgweb: return meaningful HTTP status codes instead of nonsense
Bryan O'Sullivan <bos@serpentine.com>
parents: 4462
diff changeset
170 if err.errno == errno.ENOENT:
5993
948a41e77902 hgweb: explicit response status
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 5930
diff changeset
171 raise ErrorResponse(HTTP_NOT_FOUND)
5561
22713dce19f6 hgweb: return meaningful HTTP status codes instead of nonsense
Bryan O'Sullivan <bos@serpentine.com>
parents: 4462
diff changeset
172 else:
5993
948a41e77902 hgweb: explicit response status
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 5930
diff changeset
173 raise ErrorResponse(HTTP_SERVER_ERROR, err.strerror)
3276
db9d2a624521 hgweb: Search templates in templatepath/style/map, too, using a common function.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 3244
diff changeset
174
4462
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
175 def paritygen(stripecount, offset=0):
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
176 """count parity of horizontal stripes for easier reading"""
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
177 if stripecount and offset:
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
178 # account for offset, e.g. due to building the list in reverse
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
179 count = (stripecount + offset) % stripecount
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
180 parity = (stripecount + offset) / stripecount & 1
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
181 else:
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
182 count = 0
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
183 parity = 0
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
184 while True:
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
185 yield parity
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
186 count += 1
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
187 if stripecount and count >= stripecount:
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
188 parity = 1 - parity
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
189 count = 0
12e4d9524951 hgweb: use generator to count parity of horizontal stripes for easier reading.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 4038
diff changeset
190
5779
e9f68860d5ed Don't let ui.username override web.contact (issue900)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 5760
diff changeset
191 def get_contact(config):
e9f68860d5ed Don't let ui.username override web.contact (issue900)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 5760
diff changeset
192 """Return repo contact information or empty string.
e9f68860d5ed Don't let ui.username override web.contact (issue900)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 5760
diff changeset
193
e9f68860d5ed Don't let ui.username override web.contact (issue900)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 5760
diff changeset
194 web.contact is the primary source, but if that is not set, try
e9f68860d5ed Don't let ui.username override web.contact (issue900)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 5760
diff changeset
195 ui.username or $EMAIL as a fallback to display something useful.
e9f68860d5ed Don't let ui.username override web.contact (issue900)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 5760
diff changeset
196 """
e9f68860d5ed Don't let ui.username override web.contact (issue900)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 5760
diff changeset
197 return (config("web", "contact") or
e9f68860d5ed Don't let ui.username override web.contact (issue900)
Thomas Arendsen Hein <thomas@intevation.de>
parents: 5760
diff changeset
198 config("ui", "username") or
30641
f1c9fafcbf46 py3: replace os.environ with encoding.environ (part 3 of 5)
Pulkit Goyal <7895pulkit@gmail.com>
parents: 30630
diff changeset
199 encoding.environ.get("EMAIL") or "")
12183
f64b416b0ac8 hgweb: support very simple caching model (issue1845)
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10264
diff changeset
200
f64b416b0ac8 hgweb: support very simple caching model (issue1845)
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10264
diff changeset
201 def caching(web, req):
29491
7f0498bd284e hgweb: emit a valid, weak ETag
Anton Shestakov <av6@dwimlabs.net>
parents: 27046
diff changeset
202 tag = 'W/"%s"' % web.mtime
12183
f64b416b0ac8 hgweb: support very simple caching model (issue1845)
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10264
diff changeset
203 if req.env.get('HTTP_IF_NONE_MATCH') == tag:
f64b416b0ac8 hgweb: support very simple caching model (issue1845)
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10264
diff changeset
204 raise ErrorResponse(HTTP_NOT_MODIFIED)
f64b416b0ac8 hgweb: support very simple caching model (issue1845)
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10264
diff changeset
205 req.headers.append(('ETag', tag))
30766
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
206
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
207 def cspvalues(ui):
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
208 """Obtain the Content-Security-Policy header and nonce value.
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
209
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
210 Returns a 2-tuple of the CSP header value and the nonce value.
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
211
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
212 First value is ``None`` if CSP isn't enabled. Second value is ``None``
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
213 if CSP isn't enabled or if the CSP header doesn't need a nonce.
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
214 """
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
215 # Don't allow untrusted CSP setting since it be disable protections
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
216 # from a trusted/global source.
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
217 csp = ui.config('web', 'csp', untrusted=False)
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
218 nonce = None
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
219
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
220 if csp and '%nonce%' in csp:
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
221 nonce = base64.urlsafe_b64encode(uuid.uuid4().bytes).rstrip('=')
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
222 csp = csp.replace('%nonce%', nonce)
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
223
d7bf7d2bd5ab hgweb: support Content Security Policy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30641
diff changeset
224 return csp, nonce