Mercurial > hg
annotate mercurial/wireprotoserver.py @ 48875:6000f5b25c9b
py2: remove simple from __future__ statements
These were needed for Python 2 support. Now that our linter no longer
mandates these, we can start deleting them.
Differential Revision: https://phab.mercurial-scm.org/D12254
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 03 Mar 2022 17:34:00 +0100 |
parents | 04688c51f81f |
children | 642e31cb55f0 |
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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(object): |
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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(object): |
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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(object): |
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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) |