Mercurial > hg
annotate mercurial/wireprotoserver.py @ 48946:642e31cb55f0
py3: use class X: instead of class X(object):
The inheritance from object is implied in Python 3. So this should
be equivalent.
This change was generated via an automated search and replace. So there
may have been some accidental changes.
Differential Revision: https://phab.mercurial-scm.org/D12352
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 21 Feb 2022 13:08:28 -0700 |
parents | 6000f5b25c9b |
children | d44e3c45f0e4 |
rev | line source |
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1 # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> |
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2 # Copyright 2005-2007 Olivia Mackall <olivia@selenic.com> |
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3 # |
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4 # This software may be used and distributed according to the terms of the |
10263 | 5 # GNU General Public License version 2 or any later version. |
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6 |
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7 |
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8 import contextlib |
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9 import struct |
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10 import threading |
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11 |
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12 from .i18n import _ |
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13 from . import ( |
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14 encoding, |
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15 error, |
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16 pycompat, |
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17 util, |
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18 wireprototypes, |
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19 wireprotov1server, |
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20 ) |
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21 from .interfaces import util as interfaceutil |
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22 from .utils import ( |
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23 compression, |
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24 stringutil, |
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25 ) |
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26 |
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27 stringio = util.stringio |
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28 |
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29 urlerr = util.urlerr |
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30 urlreq = util.urlreq |
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31 |
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32 HTTP_OK = 200 |
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33 |
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34 HGTYPE = b'application/mercurial-0.1' |
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35 HGTYPE2 = b'application/mercurial-0.2' |
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36 HGERRTYPE = b'application/hg-error' |
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37 |
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38 SSHV1 = wireprototypes.SSHV1 |
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39 |
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40 |
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41 def decodevaluefromheaders(req, headerprefix): |
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42 """Decode a long value from multiple HTTP request headers. |
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43 |
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44 Returns the value as a bytes, not a str. |
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45 """ |
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46 chunks = [] |
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47 i = 1 |
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48 while True: |
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49 v = req.headers.get(b'%s-%d' % (headerprefix, i)) |
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50 if v is None: |
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51 break |
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52 chunks.append(pycompat.bytesurl(v)) |
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53 i += 1 |
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54 |
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55 return b''.join(chunks) |
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56 |
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57 |
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58 @interfaceutil.implementer(wireprototypes.baseprotocolhandler) |
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59 class httpv1protocolhandler: |
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60 def __init__(self, req, ui, checkperm): |
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61 self._req = req |
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62 self._ui = ui |
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63 self._checkperm = checkperm |
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64 self._protocaps = None |
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65 |
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66 @property |
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67 def name(self): |
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68 return b'http-v1' |
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69 |
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70 def getargs(self, args): |
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71 knownargs = self._args() |
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72 data = {} |
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73 keys = args.split() |
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74 for k in keys: |
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75 if k == b'*': |
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76 star = {} |
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77 for key in knownargs.keys(): |
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78 if key != b'cmd' and key not in keys: |
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79 star[key] = knownargs[key][0] |
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80 data[b'*'] = star |
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81 else: |
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82 data[k] = knownargs[k][0] |
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83 return [data[k] for k in keys] |
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84 |
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85 def _args(self): |
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86 args = self._req.qsparams.asdictoflists() |
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87 postlen = int(self._req.headers.get(b'X-HgArgs-Post', 0)) |
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88 if postlen: |
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89 args.update( |
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90 urlreq.parseqs( |
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91 self._req.bodyfh.read(postlen), keep_blank_values=True |
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92 ) |
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93 ) |
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94 return args |
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95 |
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96 argvalue = decodevaluefromheaders(self._req, b'X-HgArg') |
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97 args.update(urlreq.parseqs(argvalue, keep_blank_values=True)) |
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98 return args |
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99 |
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100 def getprotocaps(self): |
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101 if self._protocaps is None: |
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102 value = decodevaluefromheaders(self._req, b'X-HgProto') |
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103 self._protocaps = set(value.split(b' ')) |
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104 return self._protocaps |
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105 |
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106 def getpayload(self): |
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107 # Existing clients *always* send Content-Length. |
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108 length = int(self._req.headers[b'Content-Length']) |
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109 |
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110 # If httppostargs is used, we need to read Content-Length |
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111 # minus the amount that was consumed by args. |
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112 length -= int(self._req.headers.get(b'X-HgArgs-Post', 0)) |
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113 return util.filechunkiter(self._req.bodyfh, limit=length) |
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114 |
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115 @contextlib.contextmanager |
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116 def mayberedirectstdio(self): |
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117 oldout = self._ui.fout |
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118 olderr = self._ui.ferr |
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119 |
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120 out = util.stringio() |
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121 |
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122 try: |
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123 self._ui.fout = out |
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124 self._ui.ferr = out |
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125 yield out |
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126 finally: |
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127 self._ui.fout = oldout |
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128 self._ui.ferr = olderr |
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129 |
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130 def client(self): |
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131 return b'remote:%s:%s:%s' % ( |
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132 self._req.urlscheme, |
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133 urlreq.quote(self._req.remotehost or b''), |
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134 urlreq.quote(self._req.remoteuser or b''), |
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135 ) |
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136 |
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137 def addcapabilities(self, repo, caps): |
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138 caps.append(b'batch') |
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139 |
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140 caps.append( |
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141 b'httpheader=%d' % repo.ui.configint(b'server', b'maxhttpheaderlen') |
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142 ) |
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143 if repo.ui.configbool(b'experimental', b'httppostargs'): |
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144 caps.append(b'httppostargs') |
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145 |
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146 # FUTURE advertise 0.2rx once support is implemented |
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147 # FUTURE advertise minrx and mintx after consulting config option |
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148 caps.append(b'httpmediatype=0.1rx,0.1tx,0.2tx') |
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149 |
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150 compengines = wireprototypes.supportedcompengines( |
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151 repo.ui, compression.SERVERROLE |
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152 ) |
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153 if compengines: |
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154 comptypes = b','.join( |
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155 urlreq.quote(e.wireprotosupport().name) for e in compengines |
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156 ) |
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157 caps.append(b'compression=%s' % comptypes) |
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158 |
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159 return caps |
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160 |
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161 def checkperm(self, perm): |
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162 return self._checkperm(perm) |
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163 |
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164 |
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165 # This method exists mostly so that extensions like remotefilelog can |
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166 # disable a kludgey legacy method only over http. As of early 2018, |
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167 # there are no other known users, so with any luck we can discard this |
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168 # hook if remotefilelog becomes a first-party extension. |
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169 def iscmd(cmd): |
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170 return cmd in wireprotov1server.commands |
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171 |
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172 |
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173 def handlewsgirequest(rctx, req, res, checkperm): |
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174 """Possibly process a wire protocol request. |
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175 |
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176 If the current request is a wire protocol request, the request is |
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177 processed by this function. |
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178 |
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179 ``req`` is a ``parsedrequest`` instance. |
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180 ``res`` is a ``wsgiresponse`` instance. |
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181 |
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182 Returns a bool indicating if the request was serviced. If set, the caller |
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183 should stop processing the request, as a response has already been issued. |
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184 """ |
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185 # Avoid cycle involving hg module. |
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186 from .hgweb import common as hgwebcommon |
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187 |
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188 repo = rctx.repo |
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189 |
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190 # HTTP version 1 wire protocol requests are denoted by a "cmd" query |
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191 # string parameter. If it isn't present, this isn't a wire protocol |
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192 # request. |
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193 if b'cmd' not in req.qsparams: |
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194 return False |
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195 |
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196 cmd = req.qsparams[b'cmd'] |
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197 |
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198 # The "cmd" request parameter is used by both the wire protocol and hgweb. |
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199 # While not all wire protocol commands are available for all transports, |
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200 # if we see a "cmd" value that resembles a known wire protocol command, we |
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201 # route it to a protocol handler. This is better than routing possible |
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202 # wire protocol requests to hgweb because it prevents hgweb from using |
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203 # known wire protocol commands and it is less confusing for machine |
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204 # clients. |
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205 if not iscmd(cmd): |
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206 return False |
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207 |
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208 # The "cmd" query string argument is only valid on the root path of the |
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209 # repo. e.g. ``/?cmd=foo``, ``/repo?cmd=foo``. URL paths within the repo |
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210 # like ``/blah?cmd=foo`` are not allowed. So don't recognize the request |
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211 # in this case. We send an HTTP 404 for backwards compatibility reasons. |
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212 if req.dispatchpath: |
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213 res.status = hgwebcommon.statusmessage(404) |
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214 res.headers[b'Content-Type'] = HGTYPE |
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215 # TODO This is not a good response to issue for this request. This |
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216 # is mostly for BC for now. |
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217 res.setbodybytes(b'0\n%s\n' % b'Not Found') |
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218 return True |
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219 |
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220 proto = httpv1protocolhandler( |
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221 req, repo.ui, lambda perm: checkperm(rctx, req, perm) |
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222 ) |
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223 |
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224 # The permissions checker should be the only thing that can raise an |
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225 # ErrorResponse. It is kind of a layer violation to catch an hgweb |
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226 # exception here. So consider refactoring into a exception type that |
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227 # is associated with the wire protocol. |
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228 try: |
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229 _callhttp(repo, req, res, proto, cmd) |
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230 except hgwebcommon.ErrorResponse as e: |
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231 for k, v in e.headers: |
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232 res.headers[k] = v |
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233 res.status = hgwebcommon.statusmessage( |
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234 e.code, stringutil.forcebytestr(e) |
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235 ) |
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236 # TODO This response body assumes the failed command was |
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237 # "unbundle." That assumption is not always valid. |
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238 res.setbodybytes(b'0\n%s\n' % stringutil.forcebytestr(e)) |
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239 |
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240 return True |
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241 |
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242 |
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243 def _httpresponsetype(ui, proto, prefer_uncompressed): |
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244 """Determine the appropriate response type and compression settings. |
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245 |
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246 Returns a tuple of (mediatype, compengine, engineopts). |
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247 """ |
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248 # Determine the response media type and compression engine based |
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249 # on the request parameters. |
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250 |
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251 if b'0.2' in proto.getprotocaps(): |
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252 # All clients are expected to support uncompressed data. |
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253 if prefer_uncompressed: |
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254 return HGTYPE2, compression._noopengine(), {} |
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255 |
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256 # Now find an agreed upon compression format. |
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257 compformats = wireprotov1server.clientcompressionsupport(proto) |
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258 for engine in wireprototypes.supportedcompengines( |
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259 ui, compression.SERVERROLE |
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260 ): |
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261 if engine.wireprotosupport().name in compformats: |
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262 opts = {} |
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263 level = ui.configint(b'server', b'%slevel' % engine.name()) |
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264 if level is not None: |
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265 opts[b'level'] = level |
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266 |
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267 return HGTYPE2, engine, opts |
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268 |
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269 # No mutually supported compression format. Fall back to the |
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270 # legacy protocol. |
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271 |
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272 # Don't allow untrusted settings because disabling compression or |
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273 # setting a very high compression level could lead to flooding |
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274 # the server's network or CPU. |
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275 opts = {b'level': ui.configint(b'server', b'zliblevel')} |
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276 return HGTYPE, util.compengines[b'zlib'], opts |
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277 |
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278 |
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279 def _callhttp(repo, req, res, proto, cmd): |
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280 # Avoid cycle involving hg module. |
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281 from .hgweb import common as hgwebcommon |
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282 |
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283 def genversion2(gen, engine, engineopts): |
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284 # application/mercurial-0.2 always sends a payload header |
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285 # identifying the compression engine. |
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286 name = engine.wireprotosupport().name |
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287 assert 0 < len(name) < 256 |
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288 yield struct.pack(b'B', len(name)) |
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289 yield name |
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290 |
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291 for chunk in gen: |
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292 yield chunk |
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293 |
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294 def setresponse(code, contenttype, bodybytes=None, bodygen=None): |
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295 if code == HTTP_OK: |
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296 res.status = b'200 Script output follows' |
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297 else: |
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298 res.status = hgwebcommon.statusmessage(code) |
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299 |
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300 res.headers[b'Content-Type'] = contenttype |
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301 |
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302 if bodybytes is not None: |
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303 res.setbodybytes(bodybytes) |
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304 if bodygen is not None: |
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305 res.setbodygen(bodygen) |
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306 |
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307 if not wireprotov1server.commands.commandavailable(cmd, proto): |
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308 setresponse( |
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309 HTTP_OK, |
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310 HGERRTYPE, |
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311 _( |
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312 b'requested wire protocol command is not available over ' |
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313 b'HTTP' |
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314 ), |
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315 ) |
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316 return |
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317 |
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318 proto.checkperm(wireprotov1server.commands[cmd].permission) |
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319 |
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320 rsp = wireprotov1server.dispatch(repo, proto, cmd) |
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321 |
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322 if isinstance(rsp, bytes): |
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323 setresponse(HTTP_OK, HGTYPE, bodybytes=rsp) |
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324 elif isinstance(rsp, wireprototypes.bytesresponse): |
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325 setresponse(HTTP_OK, HGTYPE, bodybytes=rsp.data) |
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326 elif isinstance(rsp, wireprototypes.streamreslegacy): |
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327 setresponse(HTTP_OK, HGTYPE, bodygen=rsp.gen) |
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328 elif isinstance(rsp, wireprototypes.streamres): |
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329 gen = rsp.gen |
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330 |
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331 # This code for compression should not be streamres specific. It |
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332 # is here because we only compress streamres at the moment. |
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333 mediatype, engine, engineopts = _httpresponsetype( |
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334 repo.ui, proto, rsp.prefer_uncompressed |
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335 ) |
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336 gen = engine.compressstream(gen, engineopts) |
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337 |
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338 if mediatype == HGTYPE2: |
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339 gen = genversion2(gen, engine, engineopts) |
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340 |
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341 setresponse(HTTP_OK, mediatype, bodygen=gen) |
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342 elif isinstance(rsp, wireprototypes.pushres): |
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343 rsp = b'%d\n%s' % (rsp.res, rsp.output) |
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344 setresponse(HTTP_OK, HGTYPE, bodybytes=rsp) |
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345 elif isinstance(rsp, wireprototypes.pusherr): |
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346 rsp = b'0\n%s\n' % rsp.res |
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347 res.drain = True |
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348 setresponse(HTTP_OK, HGTYPE, bodybytes=rsp) |
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349 elif isinstance(rsp, wireprototypes.ooberror): |
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350 setresponse(HTTP_OK, HGERRTYPE, bodybytes=rsp.message) |
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351 else: |
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352 raise error.ProgrammingError(b'hgweb.protocol internal failure', rsp) |
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353 |
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354 |
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355 def _sshv1respondbytes(fout, value): |
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356 """Send a bytes response for protocol version 1.""" |
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357 fout.write(b'%d\n' % len(value)) |
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358 fout.write(value) |
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359 fout.flush() |
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360 |
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361 |
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362 def _sshv1respondstream(fout, source): |
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363 write = fout.write |
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364 for chunk in source.gen: |
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365 write(chunk) |
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366 fout.flush() |
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367 |
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368 |
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369 def _sshv1respondooberror(fout, ferr, rsp): |
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370 ferr.write(b'%s\n-\n' % rsp) |
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371 ferr.flush() |
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372 fout.write(b'\n') |
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373 fout.flush() |
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374 |
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375 |
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376 @interfaceutil.implementer(wireprototypes.baseprotocolhandler) |
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377 class sshv1protocolhandler: |
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378 """Handler for requests services via version 1 of SSH protocol.""" |
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379 |
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380 def __init__(self, ui, fin, fout): |
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381 self._ui = ui |
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382 self._fin = fin |
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383 self._fout = fout |
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384 self._protocaps = set() |
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385 |
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386 @property |
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387 def name(self): |
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388 return wireprototypes.SSHV1 |
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389 |
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390 def getargs(self, args): |
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391 data = {} |
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392 keys = args.split() |
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393 for n in pycompat.xrange(len(keys)): |
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394 argline = self._fin.readline()[:-1] |
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395 arg, l = argline.split() |
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396 if arg not in keys: |
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397 raise error.Abort(_(b"unexpected parameter %r") % arg) |
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398 if arg == b'*': |
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399 star = {} |
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400 for k in pycompat.xrange(int(l)): |
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401 argline = self._fin.readline()[:-1] |
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402 arg, l = argline.split() |
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403 val = self._fin.read(int(l)) |
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404 star[arg] = val |
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405 data[b'*'] = star |
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406 else: |
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407 val = self._fin.read(int(l)) |
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408 data[arg] = val |
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409 return [data[k] for k in keys] |
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410 |
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411 def getprotocaps(self): |
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412 return self._protocaps |
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413 |
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414 def getpayload(self): |
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415 # We initially send an empty response. This tells the client it is |
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416 # OK to start sending data. If a client sees any other response, it |
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417 # interprets it as an error. |
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418 _sshv1respondbytes(self._fout, b'') |
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419 |
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420 # The file is in the form: |
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421 # |
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422 # <chunk size>\n<chunk> |
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423 # ... |
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424 # 0\n |
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425 count = int(self._fin.readline()) |
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426 while count: |
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427 yield self._fin.read(count) |
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428 count = int(self._fin.readline()) |
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429 |
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430 @contextlib.contextmanager |
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431 def mayberedirectstdio(self): |
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432 yield None |
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433 |
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434 def client(self): |
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435 client = encoding.environ.get(b'SSH_CLIENT', b'').split(b' ', 1)[0] |
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436 return b'remote:ssh:' + client |
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437 |
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438 def addcapabilities(self, repo, caps): |
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439 if self.name == wireprototypes.SSHV1: |
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440 caps.append(b'protocaps') |
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441 caps.append(b'batch') |
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442 return caps |
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443 |
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444 def checkperm(self, perm): |
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445 pass |
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446 |
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447 |
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448 def _runsshserver(ui, repo, fin, fout, ev): |
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449 # This function operates like a state machine of sorts. The following |
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450 # states are defined: |
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451 # |
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452 # protov1-serving |
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453 # Server is in protocol version 1 serving mode. Commands arrive on |
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454 # new lines. These commands are processed in this state, one command |
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455 # after the other. |
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456 # |
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457 # shutdown |
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458 # The server is shutting down, possibly in reaction to a client event. |
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459 # |
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460 # And here are their transitions: |
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461 # |
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462 # protov1-serving -> shutdown |
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463 # When server receives an empty request or encounters another |
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464 # error. |
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465 |
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466 state = b'protov1-serving' |
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467 proto = sshv1protocolhandler(ui, fin, fout) |
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468 |
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469 while not ev.is_set(): |
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470 if state == b'protov1-serving': |
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471 # Commands are issued on new lines. |
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472 request = fin.readline()[:-1] |
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473 |
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474 # Empty lines signal to terminate the connection. |
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475 if not request: |
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476 state = b'shutdown' |
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477 continue |
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478 |
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479 available = wireprotov1server.commands.commandavailable( |
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480 request, proto |
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481 ) |
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482 |
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483 # This command isn't available. Send an empty response and go |
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484 # back to waiting for a new command. |
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485 if not available: |
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486 _sshv1respondbytes(fout, b'') |
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487 continue |
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488 |
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489 rsp = wireprotov1server.dispatch(repo, proto, request) |
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490 repo.ui.fout.flush() |
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491 repo.ui.ferr.flush() |
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492 |
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493 if isinstance(rsp, bytes): |
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494 _sshv1respondbytes(fout, rsp) |
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495 elif isinstance(rsp, wireprototypes.bytesresponse): |
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496 _sshv1respondbytes(fout, rsp.data) |
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497 elif isinstance(rsp, wireprototypes.streamres): |
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498 _sshv1respondstream(fout, rsp) |
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499 elif isinstance(rsp, wireprototypes.streamreslegacy): |
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500 _sshv1respondstream(fout, rsp) |
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501 elif isinstance(rsp, wireprototypes.pushres): |
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502 _sshv1respondbytes(fout, b'') |
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503 _sshv1respondbytes(fout, b'%d' % rsp.res) |
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504 elif isinstance(rsp, wireprototypes.pusherr): |
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505 _sshv1respondbytes(fout, rsp.res) |
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506 elif isinstance(rsp, wireprototypes.ooberror): |
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507 _sshv1respondooberror(fout, ui.ferr, rsp.message) |
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508 else: |
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509 raise error.ProgrammingError( |
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510 b'unhandled response type from ' |
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511 b'wire protocol command: %s' % rsp |
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512 ) |
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513 |
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514 elif state == b'shutdown': |
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515 break |
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516 |
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517 else: |
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518 raise error.ProgrammingError( |
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519 b'unhandled ssh server state: %s' % state |
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520 ) |
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521 |
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522 |
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523 class sshserver: |
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524 def __init__(self, ui, repo, logfh=None): |
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525 self._ui = ui |
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526 self._repo = repo |
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527 self._fin, self._fout = ui.protectfinout() |
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528 |
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529 # Log write I/O to stdout and stderr if configured. |
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530 if logfh: |
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531 self._fout = util.makeloggingfileobject( |
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532 logfh, self._fout, b'o', logdata=True |
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533 ) |
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534 ui.ferr = util.makeloggingfileobject( |
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535 logfh, ui.ferr, b'e', logdata=True |
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536 ) |
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537 |
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538 def serve_forever(self): |
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539 self.serveuntil(threading.Event()) |
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540 self._ui.restorefinout(self._fin, self._fout) |
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541 |
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542 def serveuntil(self, ev): |
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543 """Serve until a threading.Event is set.""" |
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544 _runsshserver(self._ui, self._repo, self._fin, self._fout, ev) |