Mercurial > hg
annotate mercurial/hgweb/common.py @ 35984:cdc93fe1da77
wireprotoserver: move protocol parsing and dispatch out of hgweb
Previously, hgweb_mod had code for detecting if the request
was for the wire protocol. It would then (eventually) call
wireprotoserver.callhttp() to dispatch the request handling.
Detection of wire protocol requests is not trivial. There's
currently a big gotcha in the handling of the "cmd" request
parameter, for example.
Furthermore, in the near future we will have a second HTTP
protocol handler. Its mechanism for calling commands will be
a bit different. And we don't want the low-level logic for
detecting protocol commands to live in hgweb.
We establish a new function in wireprotoserver for detecting
an HTTP protocol request and for giving the caller an easy-to-use
mechanism for dispatching requests to it.
Some wire protocol specific functionality still lives in hgweb.
This will be addressed in subsequent commits.
Differential Revision: https://phab.mercurial-scm.org/D2019
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 31 Jan 2018 16:21:43 -0800 |
parents | 6ef744a7df65 |
children | d18c0cf5f3ab |
rev | line source |
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1 # hgweb/common.py - Utility functions needed by hgweb_mod and hgwebdir_mod |
131 | 2 # |
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3 # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> |
2859 | 4 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
131 | 5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
131 | 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 |
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16 from .. import ( |
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17 encoding, |
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18 pycompat, |
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19 util, |
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20 ) |
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21 |
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22 httpserver = util.httpserver |
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23 |
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24 HTTP_OK = 200 |
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25 HTTP_NOT_MODIFIED = 304 |
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26 HTTP_BAD_REQUEST = 400 |
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27 HTTP_UNAUTHORIZED = 401 |
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28 HTTP_FORBIDDEN = 403 |
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29 HTTP_NOT_FOUND = 404 |
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30 HTTP_METHOD_NOT_ALLOWED = 405 |
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31 HTTP_SERVER_ERROR = 500 |
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32 |
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33 |
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34 def ismember(ui, username, userlist): |
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35 """Check if username is a member of userlist. |
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36 |
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37 If userlist has a single '*' member, all users are considered members. |
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38 Can be overridden by extensions to provide more complex authorization |
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39 schemes. |
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40 """ |
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41 return userlist == ['*'] or username in userlist |
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42 |
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43 def checkauthz(hgweb, req, op): |
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44 '''Check permission for operation based on request data (including |
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45 authentication info). Return if op allowed, else raise an ErrorResponse |
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46 exception.''' |
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47 |
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48 user = req.env.get('REMOTE_USER') |
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49 |
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50 deny_read = hgweb.configlist('web', 'deny_read') |
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51 if deny_read and (not user or ismember(hgweb.repo.ui, user, deny_read)): |
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52 raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized') |
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53 |
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54 allow_read = hgweb.configlist('web', 'allow_read') |
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55 if allow_read and (not ismember(hgweb.repo.ui, user, allow_read)): |
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56 raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized') |
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57 |
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58 if op == 'pull' and not hgweb.allowpull: |
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59 raise ErrorResponse(HTTP_UNAUTHORIZED, 'pull not authorized') |
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60 elif op == 'pull' or op is None: # op is None for interface requests |
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61 return |
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62 |
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63 # enforce that you can only push using POST requests |
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64 if req.env['REQUEST_METHOD'] != 'POST': |
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65 msg = 'push requires POST request' |
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66 raise ErrorResponse(HTTP_METHOD_NOT_ALLOWED, msg) |
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67 |
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68 # require ssl by default for pushing, auth info cannot be sniffed |
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69 # and replayed |
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70 scheme = req.env.get('wsgi.url_scheme') |
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71 if hgweb.configbool('web', 'push_ssl') and scheme != 'https': |
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72 raise ErrorResponse(HTTP_FORBIDDEN, 'ssl required') |
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73 |
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74 deny = hgweb.configlist('web', 'deny_push') |
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75 if deny and (not user or ismember(hgweb.repo.ui, user, deny)): |
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76 raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized') |
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77 |
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78 allow = hgweb.configlist('web', 'allow-push') |
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79 if not (allow and ismember(hgweb.repo.ui, user, allow)): |
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80 raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized') |
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81 |
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82 # Hooks for hgweb permission checks; extensions can add hooks here. |
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83 # Each hook is invoked like this: hook(hgweb, request, operation), |
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84 # where operation is either read, pull or push. Hooks should either |
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85 # raise an ErrorResponse exception, or just return. |
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86 # |
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87 # It is possible to do both authentication and authorization through |
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88 # this. |
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89 permhooks = [checkauthz] |
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90 |
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91 |
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92 class ErrorResponse(Exception): |
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93 def __init__(self, code, message=None, headers=None): |
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94 if message is None: |
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95 message = _statusmessage(code) |
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97 self.code = code |
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98 if headers is None: |
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99 headers = [] |
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100 self.headers = headers |
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101 |
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102 class continuereader(object): |
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103 def __init__(self, f, write): |
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104 self.f = f |
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105 self._write = write |
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106 self.continued = False |
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107 |
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108 def read(self, amt=-1): |
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109 if not self.continued: |
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110 self.continued = True |
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111 self._write('HTTP/1.1 100 Continue\r\n\r\n') |
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112 return self.f.read(amt) |
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113 |
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114 def __getattr__(self, attr): |
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115 if attr in ('close', 'readline', 'readlines', '__iter__'): |
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116 return getattr(self.f, attr) |
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117 raise AttributeError |
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118 |
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119 def _statusmessage(code): |
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120 responses = httpserver.basehttprequesthandler.responses |
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121 return responses.get(code, ('Error', 'Unknown error'))[0] |
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122 |
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123 def statusmessage(code, message=None): |
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124 return '%d %s' % (code, message or _statusmessage(code)) |
131 | 125 |
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126 def get_stat(spath, fn): |
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127 """stat fn if it exists, spath otherwise""" |
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128 cl_path = os.path.join(spath, fn) |
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129 if os.path.exists(cl_path): |
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130 return os.stat(cl_path) |
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131 else: |
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132 return os.stat(spath) |
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133 |
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134 def get_mtime(spath): |
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135 return get_stat(spath, "00changelog.i").st_mtime |
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136 |
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137 def ispathsafe(path): |
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138 """Determine if a path is safe to use for filesystem access.""" |
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139 parts = path.split('/') |
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140 for part in parts: |
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141 if (part in ('', os.curdir, os.pardir) or |
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142 pycompat.ossep in part or |
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143 pycompat.osaltsep is not None and pycompat.osaltsep in part): |
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144 return False |
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145 |
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146 return True |
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147 |
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148 def staticfile(directory, fname, req): |
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149 """return a file inside directory with guessed Content-Type header |
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150 |
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151 fname always uses '/' as directory separator and isn't allowed to |
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152 contain unusual path components. |
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153 Content-Type is guessed using the mimetypes module. |
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154 Return an empty string if fname is illegal or file not found. |
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155 |
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156 """ |
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157 if not ispathsafe(fname): |
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158 return |
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159 |
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160 fpath = os.path.join(*fname.split('/')) |
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161 if isinstance(directory, str): |
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162 directory = [directory] |
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163 for d in directory: |
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164 path = os.path.join(d, fpath) |
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165 if os.path.exists(path): |
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166 break |
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167 try: |
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168 os.stat(path) |
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169 ct = mimetypes.guess_type(pycompat.fsdecode(path))[0] or "text/plain" |
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170 with open(path, 'rb') as fh: |
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171 data = fh.read() |
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172 |
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173 req.respond(HTTP_OK, ct, body=data) |
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174 except TypeError: |
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175 raise ErrorResponse(HTTP_SERVER_ERROR, 'illegal filename') |
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176 except OSError as err: |
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177 if err.errno == errno.ENOENT: |
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178 raise ErrorResponse(HTTP_NOT_FOUND) |
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179 else: |
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180 raise ErrorResponse(HTTP_SERVER_ERROR, |
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181 encoding.strtolocal(err.strerror)) |
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182 |
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183 def paritygen(stripecount, offset=0): |
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184 """count parity of horizontal stripes for easier reading""" |
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185 if stripecount and offset: |
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186 # account for offset, e.g. due to building the list in reverse |
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187 count = (stripecount + offset) % stripecount |
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188 parity = (stripecount + offset) / stripecount & 1 |
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189 else: |
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190 count = 0 |
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191 parity = 0 |
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192 while True: |
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193 yield parity |
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194 count += 1 |
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195 if stripecount and count >= stripecount: |
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196 parity = 1 - parity |
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197 count = 0 |
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198 |
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199 def get_contact(config): |
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200 """Return repo contact information or empty string. |
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201 |
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202 web.contact is the primary source, but if that is not set, try |
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203 ui.username or $EMAIL as a fallback to display something useful. |
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204 """ |
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205 return (config("web", "contact") or |
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206 config("ui", "username") or |
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207 encoding.environ.get("EMAIL") or "") |
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208 |
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209 def caching(web, req): |
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210 tag = r'W/"%d"' % web.mtime |
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211 if req.env.get('HTTP_IF_NONE_MATCH') == tag: |
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212 raise ErrorResponse(HTTP_NOT_MODIFIED) |
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213 req.headers.append(('ETag', tag)) |
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214 |
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215 def cspvalues(ui): |
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216 """Obtain the Content-Security-Policy header and nonce value. |
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217 |
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218 Returns a 2-tuple of the CSP header value and the nonce value. |
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219 |
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220 First value is ``None`` if CSP isn't enabled. Second value is ``None`` |
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221 if CSP isn't enabled or if the CSP header doesn't need a nonce. |
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222 """ |
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223 # Without demandimport, "import uuid" could have an immediate side-effect |
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224 # running "ldconfig" on Linux trying to find libuuid. |
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225 # With Python <= 2.7.12, that "ldconfig" is run via a shell and the shell |
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226 # may pollute the terminal with: |
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227 # |
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228 # shell-init: error retrieving current directory: getcwd: cannot access |
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229 # parent directories: No such file or directory |
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230 # |
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231 # Python >= 2.7.13 has fixed it by running "ldconfig" directly without a |
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232 # shell (hg changeset a09ae70f3489). |
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233 # |
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234 # Moved "import uuid" from here so it's executed after we know we have |
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235 # a sane cwd (i.e. after dispatch.py cwd check). |
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236 # |
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237 # We can move it back once we no longer need Python <= 2.7.12 support. |
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238 import uuid |
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239 |
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240 # Don't allow untrusted CSP setting since it be disable protections |
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241 # from a trusted/global source. |
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242 csp = ui.config('web', 'csp', untrusted=False) |
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243 nonce = None |
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244 |
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245 if csp and '%nonce%' in csp: |
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246 nonce = base64.urlsafe_b64encode(uuid.uuid4().bytes).rstrip('=') |
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247 csp = csp.replace('%nonce%', nonce) |
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248 |
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249 return csp, nonce |