Mercurial > hg
annotate mercurial/wireprotoserver.py @ 45726:d1072cba8aff
pycompat: update comment about unnamedtempfile
I found the comment clearer. I end up having to think about this for
`TemporaryFile` and I update that one in the process.
Differential Revision: https://phab.mercurial-scm.org/D9210
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 14 Oct 2020 21:47:14 +0200 |
parents | 8ff1ecfadcd1 |
children | b7b8a1538161 |
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 Matt Mackall <mpm@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 from __future__ import absolute_import |
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8 |
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9 import contextlib |
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10 import struct |
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11 import sys |
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12 import threading |
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13 |
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14 from .i18n import _ |
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15 from . import ( |
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16 encoding, |
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17 error, |
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18 pycompat, |
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19 util, |
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20 wireprototypes, |
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21 wireprotov1server, |
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22 wireprotov2server, |
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23 ) |
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24 from .interfaces import util as interfaceutil |
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25 from .utils import ( |
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26 cborutil, |
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27 compression, |
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28 ) |
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29 |
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30 stringio = util.stringio |
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31 |
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32 urlerr = util.urlerr |
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33 urlreq = util.urlreq |
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34 |
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35 HTTP_OK = 200 |
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36 |
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37 HGTYPE = b'application/mercurial-0.1' |
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38 HGTYPE2 = b'application/mercurial-0.2' |
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39 HGERRTYPE = b'application/hg-error' |
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40 |
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41 SSHV1 = wireprototypes.SSHV1 |
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42 SSHV2 = wireprototypes.SSHV2 |
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43 |
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44 |
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45 def decodevaluefromheaders(req, headerprefix): |
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46 """Decode a long value from multiple HTTP request headers. |
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47 |
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48 Returns the value as a bytes, not a str. |
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49 """ |
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50 chunks = [] |
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51 i = 1 |
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52 while True: |
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53 v = req.headers.get(b'%s-%d' % (headerprefix, i)) |
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54 if v is None: |
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55 break |
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56 chunks.append(pycompat.bytesurl(v)) |
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57 i += 1 |
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58 |
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59 return b''.join(chunks) |
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60 |
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61 |
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62 @interfaceutil.implementer(wireprototypes.baseprotocolhandler) |
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63 class httpv1protocolhandler(object): |
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64 def __init__(self, req, ui, checkperm): |
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65 self._req = req |
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66 self._ui = ui |
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67 self._checkperm = checkperm |
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68 self._protocaps = None |
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69 |
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70 @property |
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71 def name(self): |
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72 return b'http-v1' |
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73 |
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74 def getargs(self, args): |
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75 knownargs = self._args() |
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76 data = {} |
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77 keys = args.split() |
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78 for k in keys: |
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79 if k == b'*': |
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80 star = {} |
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81 for key in knownargs.keys(): |
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82 if key != b'cmd' and key not in keys: |
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83 star[key] = knownargs[key][0] |
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84 data[b'*'] = star |
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85 else: |
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86 data[k] = knownargs[k][0] |
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87 return [data[k] for k in keys] |
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88 |
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89 def _args(self): |
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90 args = self._req.qsparams.asdictoflists() |
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91 postlen = int(self._req.headers.get(b'X-HgArgs-Post', 0)) |
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92 if postlen: |
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93 args.update( |
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94 urlreq.parseqs( |
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95 self._req.bodyfh.read(postlen), keep_blank_values=True |
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96 ) |
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97 ) |
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98 return args |
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99 |
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100 argvalue = decodevaluefromheaders(self._req, b'X-HgArg') |
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101 args.update(urlreq.parseqs(argvalue, keep_blank_values=True)) |
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102 return args |
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103 |
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104 def getprotocaps(self): |
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105 if self._protocaps is None: |
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106 value = decodevaluefromheaders(self._req, b'X-HgProto') |
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107 self._protocaps = set(value.split(b' ')) |
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108 return self._protocaps |
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109 |
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110 def getpayload(self): |
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111 # Existing clients *always* send Content-Length. |
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112 length = int(self._req.headers[b'Content-Length']) |
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113 |
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114 # If httppostargs is used, we need to read Content-Length |
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115 # minus the amount that was consumed by args. |
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116 length -= int(self._req.headers.get(b'X-HgArgs-Post', 0)) |
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117 return util.filechunkiter(self._req.bodyfh, limit=length) |
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118 |
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119 @contextlib.contextmanager |
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120 def mayberedirectstdio(self): |
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121 oldout = self._ui.fout |
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122 olderr = self._ui.ferr |
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123 |
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124 out = util.stringio() |
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125 |
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126 try: |
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127 self._ui.fout = out |
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128 self._ui.ferr = out |
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129 yield out |
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130 finally: |
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131 self._ui.fout = oldout |
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132 self._ui.ferr = olderr |
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133 |
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134 def client(self): |
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135 return b'remote:%s:%s:%s' % ( |
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136 self._req.urlscheme, |
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137 urlreq.quote(self._req.remotehost or b''), |
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138 urlreq.quote(self._req.remoteuser or b''), |
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139 ) |
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140 |
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141 def addcapabilities(self, repo, caps): |
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142 caps.append(b'batch') |
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143 |
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144 caps.append( |
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145 b'httpheader=%d' % repo.ui.configint(b'server', b'maxhttpheaderlen') |
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146 ) |
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147 if repo.ui.configbool(b'experimental', b'httppostargs'): |
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148 caps.append(b'httppostargs') |
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149 |
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150 # FUTURE advertise 0.2rx once support is implemented |
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151 # FUTURE advertise minrx and mintx after consulting config option |
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152 caps.append(b'httpmediatype=0.1rx,0.1tx,0.2tx') |
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153 |
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154 compengines = wireprototypes.supportedcompengines( |
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155 repo.ui, compression.SERVERROLE |
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156 ) |
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157 if compengines: |
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158 comptypes = b','.join( |
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159 urlreq.quote(e.wireprotosupport().name) for e in compengines |
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160 ) |
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161 caps.append(b'compression=%s' % comptypes) |
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162 |
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163 return caps |
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164 |
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165 def checkperm(self, perm): |
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166 return self._checkperm(perm) |
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167 |
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168 |
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169 # This method exists mostly so that extensions like remotefilelog can |
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170 # disable a kludgey legacy method only over http. As of early 2018, |
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171 # there are no other known users, so with any luck we can discard this |
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172 # hook if remotefilelog becomes a first-party extension. |
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173 def iscmd(cmd): |
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174 return cmd in wireprotov1server.commands |
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175 |
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176 |
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177 def handlewsgirequest(rctx, req, res, checkperm): |
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178 """Possibly process a wire protocol request. |
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179 |
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180 If the current request is a wire protocol request, the request is |
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181 processed by this function. |
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182 |
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183 ``req`` is a ``parsedrequest`` instance. |
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184 ``res`` is a ``wsgiresponse`` instance. |
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185 |
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186 Returns a bool indicating if the request was serviced. If set, the caller |
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187 should stop processing the request, as a response has already been issued. |
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188 """ |
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189 # Avoid cycle involving hg module. |
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190 from .hgweb import common as hgwebcommon |
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191 |
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192 repo = rctx.repo |
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193 |
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194 # HTTP version 1 wire protocol requests are denoted by a "cmd" query |
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195 # string parameter. If it isn't present, this isn't a wire protocol |
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196 # request. |
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197 if b'cmd' not in req.qsparams: |
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198 return False |
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199 |
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200 cmd = req.qsparams[b'cmd'] |
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201 |
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202 # The "cmd" request parameter is used by both the wire protocol and hgweb. |
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203 # While not all wire protocol commands are available for all transports, |
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204 # if we see a "cmd" value that resembles a known wire protocol command, we |
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205 # route it to a protocol handler. This is better than routing possible |
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206 # wire protocol requests to hgweb because it prevents hgweb from using |
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207 # known wire protocol commands and it is less confusing for machine |
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208 # clients. |
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209 if not iscmd(cmd): |
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210 return False |
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211 |
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212 # The "cmd" query string argument is only valid on the root path of the |
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213 # repo. e.g. ``/?cmd=foo``, ``/repo?cmd=foo``. URL paths within the repo |
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214 # like ``/blah?cmd=foo`` are not allowed. So don't recognize the request |
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215 # in this case. We send an HTTP 404 for backwards compatibility reasons. |
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216 if req.dispatchpath: |
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217 res.status = hgwebcommon.statusmessage(404) |
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218 res.headers[b'Content-Type'] = HGTYPE |
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219 # TODO This is not a good response to issue for this request. This |
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220 # is mostly for BC for now. |
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221 res.setbodybytes(b'0\n%s\n' % b'Not Found') |
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222 return True |
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223 |
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224 proto = httpv1protocolhandler( |
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225 req, repo.ui, lambda perm: checkperm(rctx, req, perm) |
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226 ) |
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227 |
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228 # The permissions checker should be the only thing that can raise an |
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229 # ErrorResponse. It is kind of a layer violation to catch an hgweb |
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230 # exception here. So consider refactoring into a exception type that |
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231 # is associated with the wire protocol. |
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232 try: |
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233 _callhttp(repo, req, res, proto, cmd) |
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234 except hgwebcommon.ErrorResponse as e: |
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235 for k, v in e.headers: |
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236 res.headers[k] = v |
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237 res.status = hgwebcommon.statusmessage(e.code, pycompat.bytestr(e)) |
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238 # TODO This response body assumes the failed command was |
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239 # "unbundle." That assumption is not always valid. |
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240 res.setbodybytes(b'0\n%s\n' % pycompat.bytestr(e)) |
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241 |
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242 return True |
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243 |
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244 |
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245 def _availableapis(repo): |
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246 apis = set() |
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247 |
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248 # Registered APIs are made available via config options of the name of |
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249 # the protocol. |
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250 for k, v in API_HANDLERS.items(): |
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251 section, option = v[b'config'] |
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252 if repo.ui.configbool(section, option): |
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253 apis.add(k) |
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254 |
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255 return apis |
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256 |
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257 |
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258 def handlewsgiapirequest(rctx, req, res, checkperm): |
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259 """Handle requests to /api/*.""" |
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260 assert req.dispatchparts[0] == b'api' |
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261 |
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262 repo = rctx.repo |
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263 |
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264 # This whole URL space is experimental for now. But we want to |
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265 # reserve the URL space. So, 404 all URLs if the feature isn't enabled. |
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266 if not repo.ui.configbool(b'experimental', b'web.apiserver'): |
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267 res.status = b'404 Not Found' |
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268 res.headers[b'Content-Type'] = b'text/plain' |
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269 res.setbodybytes(_(b'Experimental API server endpoint not enabled')) |
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270 return |
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271 |
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272 # The URL space is /api/<protocol>/*. The structure of URLs under varies |
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273 # by <protocol>. |
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274 |
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275 availableapis = _availableapis(repo) |
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276 |
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277 # Requests to /api/ list available APIs. |
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278 if req.dispatchparts == [b'api']: |
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279 res.status = b'200 OK' |
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280 res.headers[b'Content-Type'] = b'text/plain' |
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281 lines = [ |
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282 _( |
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283 b'APIs can be accessed at /api/<name>, where <name> can be ' |
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284 b'one of the following:\n' |
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285 ) |
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286 ] |
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287 if availableapis: |
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288 lines.extend(sorted(availableapis)) |
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289 else: |
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290 lines.append(_(b'(no available APIs)\n')) |
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291 res.setbodybytes(b'\n'.join(lines)) |
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292 return |
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293 |
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294 proto = req.dispatchparts[1] |
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295 |
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296 if proto not in API_HANDLERS: |
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297 res.status = b'404 Not Found' |
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298 res.headers[b'Content-Type'] = b'text/plain' |
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299 res.setbodybytes( |
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300 _(b'Unknown API: %s\nKnown APIs: %s') |
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301 % (proto, b', '.join(sorted(availableapis))) |
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302 ) |
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303 return |
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304 |
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305 if proto not in availableapis: |
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306 res.status = b'404 Not Found' |
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307 res.headers[b'Content-Type'] = b'text/plain' |
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308 res.setbodybytes(_(b'API %s not enabled\n') % proto) |
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309 return |
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310 |
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311 API_HANDLERS[proto][b'handler']( |
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312 rctx, req, res, checkperm, req.dispatchparts[2:] |
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313 ) |
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314 |
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315 |
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316 # Maps API name to metadata so custom API can be registered. |
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317 # Keys are: |
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318 # |
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319 # config |
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320 # Config option that controls whether service is enabled. |
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321 # handler |
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322 # Callable receiving (rctx, req, res, checkperm, urlparts) that is called |
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323 # when a request to this API is received. |
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324 # apidescriptor |
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325 # Callable receiving (req, repo) that is called to obtain an API |
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326 # descriptor for this service. The response must be serializable to CBOR. |
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327 API_HANDLERS = { |
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328 wireprotov2server.HTTP_WIREPROTO_V2: { |
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329 b'config': (b'experimental', b'web.api.http-v2'), |
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330 b'handler': wireprotov2server.handlehttpv2request, |
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331 b'apidescriptor': wireprotov2server.httpv2apidescriptor, |
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332 }, |
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333 } |
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334 |
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335 |
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336 def _httpresponsetype(ui, proto, prefer_uncompressed): |
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337 """Determine the appropriate response type and compression settings. |
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338 |
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339 Returns a tuple of (mediatype, compengine, engineopts). |
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340 """ |
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341 # Determine the response media type and compression engine based |
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342 # on the request parameters. |
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343 |
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344 if b'0.2' in proto.getprotocaps(): |
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345 # All clients are expected to support uncompressed data. |
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346 if prefer_uncompressed: |
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347 return HGTYPE2, compression._noopengine(), {} |
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348 |
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349 # Now find an agreed upon compression format. |
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350 compformats = wireprotov1server.clientcompressionsupport(proto) |
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351 for engine in wireprototypes.supportedcompengines( |
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352 ui, compression.SERVERROLE |
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353 ): |
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354 if engine.wireprotosupport().name in compformats: |
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355 opts = {} |
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356 level = ui.configint(b'server', b'%slevel' % engine.name()) |
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357 if level is not None: |
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358 opts[b'level'] = level |
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359 |
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360 return HGTYPE2, engine, opts |
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361 |
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362 # No mutually supported compression format. Fall back to the |
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363 # legacy protocol. |
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364 |
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365 # Don't allow untrusted settings because disabling compression or |
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366 # setting a very high compression level could lead to flooding |
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367 # the server's network or CPU. |
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368 opts = {b'level': ui.configint(b'server', b'zliblevel')} |
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369 return HGTYPE, util.compengines[b'zlib'], opts |
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370 |
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371 |
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372 def processcapabilitieshandshake(repo, req, res, proto): |
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373 """Called during a ?cmd=capabilities request. |
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374 |
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375 If the client is advertising support for a newer protocol, we send |
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376 a CBOR response with information about available services. If no |
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377 advertised services are available, we don't handle the request. |
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378 """ |
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379 # Fall back to old behavior unless the API server is enabled. |
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380 if not repo.ui.configbool(b'experimental', b'web.apiserver'): |
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381 return False |
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382 |
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383 clientapis = decodevaluefromheaders(req, b'X-HgUpgrade') |
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384 protocaps = decodevaluefromheaders(req, b'X-HgProto') |
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385 if not clientapis or not protocaps: |
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386 return False |
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387 |
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388 # We currently only support CBOR responses. |
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389 protocaps = set(protocaps.split(b' ')) |
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390 if b'cbor' not in protocaps: |
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391 return False |
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392 |
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393 descriptors = {} |
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394 |
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395 for api in sorted(set(clientapis.split()) & _availableapis(repo)): |
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396 handler = API_HANDLERS[api] |
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397 |
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398 descriptorfn = handler.get(b'apidescriptor') |
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399 if not descriptorfn: |
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400 continue |
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401 |
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402 descriptors[api] = descriptorfn(req, repo) |
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403 |
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404 v1caps = wireprotov1server.dispatch(repo, proto, b'capabilities') |
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405 assert isinstance(v1caps, wireprototypes.bytesresponse) |
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406 |
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407 m = { |
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408 # TODO allow this to be configurable. |
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409 b'apibase': b'api/', |
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410 b'apis': descriptors, |
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411 b'v1capabilities': v1caps.data, |
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412 } |
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413 |
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414 res.status = b'200 OK' |
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415 res.headers[b'Content-Type'] = b'application/mercurial-cbor' |
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416 res.setbodybytes(b''.join(cborutil.streamencode(m))) |
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417 |
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418 return True |
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419 |
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420 |
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421 def _callhttp(repo, req, res, proto, cmd): |
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422 # Avoid cycle involving hg module. |
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423 from .hgweb import common as hgwebcommon |
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424 |
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425 def genversion2(gen, engine, engineopts): |
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426 # application/mercurial-0.2 always sends a payload header |
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427 # identifying the compression engine. |
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428 name = engine.wireprotosupport().name |
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429 assert 0 < len(name) < 256 |
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430 yield struct.pack(b'B', len(name)) |
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431 yield name |
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432 |
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433 for chunk in gen: |
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434 yield chunk |
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435 |
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436 def setresponse(code, contenttype, bodybytes=None, bodygen=None): |
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437 if code == HTTP_OK: |
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438 res.status = b'200 Script output follows' |
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439 else: |
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440 res.status = hgwebcommon.statusmessage(code) |
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441 |
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442 res.headers[b'Content-Type'] = contenttype |
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443 |
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444 if bodybytes is not None: |
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445 res.setbodybytes(bodybytes) |
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446 if bodygen is not None: |
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447 res.setbodygen(bodygen) |
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448 |
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449 if not wireprotov1server.commands.commandavailable(cmd, proto): |
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450 setresponse( |
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451 HTTP_OK, |
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452 HGERRTYPE, |
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453 _( |
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454 b'requested wire protocol command is not available over ' |
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455 b'HTTP' |
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456 ), |
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457 ) |
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458 return |
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459 |
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460 proto.checkperm(wireprotov1server.commands[cmd].permission) |
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461 |
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462 # Possibly handle a modern client wanting to switch protocols. |
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463 if cmd == b'capabilities' and processcapabilitieshandshake( |
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464 repo, req, res, proto |
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465 ): |
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466 |
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467 return |
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468 |
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469 rsp = wireprotov1server.dispatch(repo, proto, cmd) |
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470 |
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471 if isinstance(rsp, bytes): |
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472 setresponse(HTTP_OK, HGTYPE, bodybytes=rsp) |
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473 elif isinstance(rsp, wireprototypes.bytesresponse): |
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474 setresponse(HTTP_OK, HGTYPE, bodybytes=rsp.data) |
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475 elif isinstance(rsp, wireprototypes.streamreslegacy): |
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476 setresponse(HTTP_OK, HGTYPE, bodygen=rsp.gen) |
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477 elif isinstance(rsp, wireprototypes.streamres): |
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478 gen = rsp.gen |
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479 |
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480 # This code for compression should not be streamres specific. It |
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481 # is here because we only compress streamres at the moment. |
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482 mediatype, engine, engineopts = _httpresponsetype( |
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483 repo.ui, proto, rsp.prefer_uncompressed |
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484 ) |
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485 gen = engine.compressstream(gen, engineopts) |
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486 |
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487 if mediatype == HGTYPE2: |
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488 gen = genversion2(gen, engine, engineopts) |
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489 |
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490 setresponse(HTTP_OK, mediatype, bodygen=gen) |
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491 elif isinstance(rsp, wireprototypes.pushres): |
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492 rsp = b'%d\n%s' % (rsp.res, rsp.output) |
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493 setresponse(HTTP_OK, HGTYPE, bodybytes=rsp) |
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494 elif isinstance(rsp, wireprototypes.pusherr): |
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495 rsp = b'0\n%s\n' % rsp.res |
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496 res.drain = True |
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497 setresponse(HTTP_OK, HGTYPE, bodybytes=rsp) |
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498 elif isinstance(rsp, wireprototypes.ooberror): |
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499 setresponse(HTTP_OK, HGERRTYPE, bodybytes=rsp.message) |
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500 else: |
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501 raise error.ProgrammingError(b'hgweb.protocol internal failure', rsp) |
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502 |
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503 |
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504 def _sshv1respondbytes(fout, value): |
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505 """Send a bytes response for protocol version 1.""" |
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506 fout.write(b'%d\n' % len(value)) |
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507 fout.write(value) |
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508 fout.flush() |
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509 |
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510 |
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511 def _sshv1respondstream(fout, source): |
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512 write = fout.write |
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513 for chunk in source.gen: |
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514 write(chunk) |
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515 fout.flush() |
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516 |
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517 |
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518 def _sshv1respondooberror(fout, ferr, rsp): |
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519 ferr.write(b'%s\n-\n' % rsp) |
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520 ferr.flush() |
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521 fout.write(b'\n') |
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522 fout.flush() |
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523 |
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524 |
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525 @interfaceutil.implementer(wireprototypes.baseprotocolhandler) |
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|
526 class sshv1protocolhandler(object): |
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527 """Handler for requests services via version 1 of SSH protocol.""" |
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528 |
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529 def __init__(self, ui, fin, fout): |
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530 self._ui = ui |
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531 self._fin = fin |
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|
532 self._fout = fout |
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533 self._protocaps = set() |
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|
534 |
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535 @property |
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536 def name(self): |
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537 return wireprototypes.SSHV1 |
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538 |
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539 def getargs(self, args): |
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540 data = {} |
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|
541 keys = args.split() |
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|
542 for n in pycompat.xrange(len(keys)): |
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543 argline = self._fin.readline()[:-1] |
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544 arg, l = argline.split() |
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|
545 if arg not in keys: |
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546 raise error.Abort(_(b"unexpected parameter %r") % arg) |
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547 if arg == b'*': |
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|
548 star = {} |
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549 for k in pycompat.xrange(int(l)): |
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550 argline = self._fin.readline()[:-1] |
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551 arg, l = argline.split() |
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552 val = self._fin.read(int(l)) |
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553 star[arg] = val |
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554 data[b'*'] = star |
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555 else: |
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556 val = self._fin.read(int(l)) |
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557 data[arg] = val |
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558 return [data[k] for k in keys] |
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559 |
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560 def getprotocaps(self): |
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561 return self._protocaps |
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562 |
37414
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563 def getpayload(self): |
36372
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564 # We initially send an empty response. This tells the client it is |
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565 # OK to start sending data. If a client sees any other response, it |
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566 # interprets it as an error. |
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567 _sshv1respondbytes(self._fout, b'') |
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568 |
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569 # The file is in the form: |
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570 # |
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571 # <chunk size>\n<chunk> |
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572 # ... |
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573 # 0\n |
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574 count = int(self._fin.readline()) |
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575 while count: |
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576 yield self._fin.read(count) |
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577 count = int(self._fin.readline()) |
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578 |
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579 @contextlib.contextmanager |
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580 def mayberedirectstdio(self): |
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581 yield None |
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582 |
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583 def client(self): |
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584 client = encoding.environ.get(b'SSH_CLIENT', b'').split(b' ', 1)[0] |
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585 return b'remote:ssh:' + client |
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586 |
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587 def addcapabilities(self, repo, caps): |
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588 if self.name == wireprototypes.SSHV1: |
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589 caps.append(b'protocaps') |
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590 caps.append(b'batch') |
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591 return caps |
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592 |
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593 def checkperm(self, perm): |
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594 pass |
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595 |
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596 |
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597 class sshv2protocolhandler(sshv1protocolhandler): |
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598 """Protocol handler for version 2 of the SSH protocol.""" |
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599 |
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600 @property |
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601 def name(self): |
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602 return wireprototypes.SSHV2 |
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603 |
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604 def addcapabilities(self, repo, caps): |
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605 return caps |
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606 |
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607 |
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608 def _runsshserver(ui, repo, fin, fout, ev): |
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609 # This function operates like a state machine of sorts. The following |
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610 # states are defined: |
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611 # |
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612 # protov1-serving |
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613 # Server is in protocol version 1 serving mode. Commands arrive on |
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614 # new lines. These commands are processed in this state, one command |
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615 # after the other. |
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616 # |
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617 # protov2-serving |
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618 # Server is in protocol version 2 serving mode. |
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619 # |
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620 # upgrade-initial |
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621 # The server is going to process an upgrade request. |
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622 # |
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623 # upgrade-v2-filter-legacy-handshake |
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624 # The protocol is being upgraded to version 2. The server is expecting |
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625 # the legacy handshake from version 1. |
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626 # |
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627 # upgrade-v2-finish |
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628 # The upgrade to version 2 of the protocol is imminent. |
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629 # |
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630 # shutdown |
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631 # The server is shutting down, possibly in reaction to a client event. |
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632 # |
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633 # And here are their transitions: |
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634 # |
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635 # protov1-serving -> shutdown |
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636 # When server receives an empty request or encounters another |
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637 # error. |
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638 # |
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639 # protov1-serving -> upgrade-initial |
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640 # An upgrade request line was seen. |
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|
641 # |
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642 # upgrade-initial -> upgrade-v2-filter-legacy-handshake |
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643 # Upgrade to version 2 in progress. Server is expecting to |
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644 # process a legacy handshake. |
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645 # |
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646 # upgrade-v2-filter-legacy-handshake -> shutdown |
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647 # Client did not fulfill upgrade handshake requirements. |
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648 # |
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649 # upgrade-v2-filter-legacy-handshake -> upgrade-v2-finish |
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|
650 # Client fulfilled version 2 upgrade requirements. Finishing that |
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651 # upgrade. |
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|
652 # |
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|
653 # upgrade-v2-finish -> protov2-serving |
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654 # Protocol upgrade to version 2 complete. Server can now speak protocol |
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655 # version 2. |
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656 # |
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657 # protov2-serving -> protov1-serving |
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658 # Ths happens by default since protocol version 2 is the same as |
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659 # version 1 except for the handshake. |
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660 |
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661 state = b'protov1-serving' |
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662 proto = sshv1protocolhandler(ui, fin, fout) |
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663 protoswitched = False |
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664 |
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|
665 while not ev.is_set(): |
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666 if state == b'protov1-serving': |
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667 # Commands are issued on new lines. |
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668 request = fin.readline()[:-1] |
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669 |
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|
670 # Empty lines signal to terminate the connection. |
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671 if not request: |
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672 state = b'shutdown' |
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673 continue |
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674 |
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675 # It looks like a protocol upgrade request. Transition state to |
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676 # handle it. |
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677 if request.startswith(b'upgrade '): |
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678 if protoswitched: |
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679 _sshv1respondooberror( |
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680 fout, |
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681 ui.ferr, |
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682 b'cannot upgrade protocols multiple times', |
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|
683 ) |
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684 state = b'shutdown' |
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|
685 continue |
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|
686 |
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687 state = b'upgrade-initial' |
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|
688 continue |
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|
689 |
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690 available = wireprotov1server.commands.commandavailable( |
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|
691 request, proto |
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|
692 ) |
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|
693 |
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|
694 # This command isn't available. Send an empty response and go |
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|
695 # back to waiting for a new command. |
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|
696 if not available: |
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|
697 _sshv1respondbytes(fout, b'') |
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|
698 continue |
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|
699 |
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|
700 rsp = wireprotov1server.dispatch(repo, proto, request) |
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diff
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|
701 repo.ui.fout.flush() |
7e19b640c53e
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|
702 repo.ui.ferr.flush() |
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|
703 |
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|
704 if isinstance(rsp, bytes): |
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|
705 _sshv1respondbytes(fout, rsp) |
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|
706 elif isinstance(rsp, wireprototypes.bytesresponse): |
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|
707 _sshv1respondbytes(fout, rsp.data) |
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|
708 elif isinstance(rsp, wireprototypes.streamres): |
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|
709 _sshv1respondstream(fout, rsp) |
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|
710 elif isinstance(rsp, wireprototypes.streamreslegacy): |
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|
711 _sshv1respondstream(fout, rsp) |
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|
712 elif isinstance(rsp, wireprototypes.pushres): |
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|
713 _sshv1respondbytes(fout, b'') |
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|
714 _sshv1respondbytes(fout, b'%d' % rsp.res) |
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|
715 elif isinstance(rsp, wireprototypes.pusherr): |
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|
716 _sshv1respondbytes(fout, rsp.res) |
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|
717 elif isinstance(rsp, wireprototypes.ooberror): |
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|
718 _sshv1respondooberror(fout, ui.ferr, rsp.message) |
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|
719 else: |
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|
720 raise error.ProgrammingError( |
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|
721 b'unhandled response type from ' |
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|
722 b'wire protocol command: %s' % rsp |
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|
723 ) |
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|
724 |
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|
725 # For now, protocol version 2 serving just goes back to version 1. |
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|
726 elif state == b'protov2-serving': |
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|
727 state = b'protov1-serving' |
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diff
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|
728 continue |
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changeset
|
729 |
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changeset
|
730 elif state == b'upgrade-initial': |
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|
731 # We should never transition into this state if we've switched |
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|
732 # protocols. |
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|
733 assert not protoswitched |
36536
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wireprotoserver: move SSHV1 and SSHV2 constants to wireprototypes
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parents:
36526
diff
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|
734 assert proto.name == wireprototypes.SSHV1 |
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|
735 |
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|
736 # Expected: upgrade <token> <capabilities> |
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diff
changeset
|
737 # If we get something else, the request is malformed. It could be |
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|
738 # from a future client that has altered the upgrade line content. |
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|
739 # We treat this as an unknown command. |
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changeset
|
740 try: |
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changeset
|
741 token, caps = request.split(b' ')[1:] |
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diff
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|
742 except ValueError: |
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|
743 _sshv1respondbytes(fout, b'') |
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|
744 state = b'protov1-serving' |
36215
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diff
changeset
|
745 continue |
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parents:
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diff
changeset
|
746 |
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changeset
|
747 # Send empty response if we don't support upgrading protocols. |
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changeset
|
748 if not ui.configbool(b'experimental', b'sshserver.support-v2'): |
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parents:
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diff
changeset
|
749 _sshv1respondbytes(fout, b'') |
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changeset
|
750 state = b'protov1-serving' |
36215
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parents:
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diff
changeset
|
751 continue |
464bedc0fdb4
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parents:
36214
diff
changeset
|
752 |
464bedc0fdb4
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parents:
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diff
changeset
|
753 try: |
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parents:
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diff
changeset
|
754 caps = urlreq.parseqs(caps) |
464bedc0fdb4
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diff
changeset
|
755 except ValueError: |
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parents:
36214
diff
changeset
|
756 _sshv1respondbytes(fout, b'') |
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diff
changeset
|
757 state = b'protov1-serving' |
36215
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diff
changeset
|
758 continue |
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parents:
36214
diff
changeset
|
759 |
464bedc0fdb4
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parents:
36214
diff
changeset
|
760 # We don't see an upgrade request to protocol version 2. Ignore |
464bedc0fdb4
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
761 # the upgrade request. |
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|
762 wantedprotos = caps.get(b'proto', [b''])[0] |
464bedc0fdb4
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diff
changeset
|
763 if SSHV2 not in wantedprotos: |
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parents:
36214
diff
changeset
|
764 _sshv1respondbytes(fout, b'') |
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changeset
|
765 state = b'protov1-serving' |
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changeset
|
766 continue |
464bedc0fdb4
wireprotoserver: handle SSH protocol version 2 upgrade requests
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36214
diff
changeset
|
767 |
464bedc0fdb4
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parents:
36214
diff
changeset
|
768 # It looks like we can honor this upgrade request to protocol 2. |
464bedc0fdb4
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diff
changeset
|
769 # Filter the rest of the handshake protocol request lines. |
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changeset
|
770 state = b'upgrade-v2-filter-legacy-handshake' |
36215
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parents:
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diff
changeset
|
771 continue |
464bedc0fdb4
wireprotoserver: handle SSH protocol version 2 upgrade requests
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parents:
36214
diff
changeset
|
772 |
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43076
diff
changeset
|
773 elif state == b'upgrade-v2-filter-legacy-handshake': |
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parents:
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diff
changeset
|
774 # Client should have sent legacy handshake after an ``upgrade`` |
464bedc0fdb4
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
36214
diff
changeset
|
775 # request. Expected lines: |
464bedc0fdb4
wireprotoserver: handle SSH protocol version 2 upgrade requests
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36214
diff
changeset
|
776 # |
464bedc0fdb4
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parents:
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diff
changeset
|
777 # hello |
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parents:
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diff
changeset
|
778 # between |
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diff
changeset
|
779 # pairs 81 |
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changeset
|
780 # 0000...-0000... |
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diff
changeset
|
781 |
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diff
changeset
|
782 ok = True |
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parents:
36214
diff
changeset
|
783 for line in (b'hello', b'between', b'pairs 81'): |
464bedc0fdb4
wireprotoserver: handle SSH protocol version 2 upgrade requests
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parents:
36214
diff
changeset
|
784 request = fin.readline()[:-1] |
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parents:
36214
diff
changeset
|
785 |
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parents:
36214
diff
changeset
|
786 if request != line: |
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diff
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|
787 _sshv1respondooberror( |
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diff
changeset
|
788 fout, |
2372284d9457
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parents:
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diff
changeset
|
789 ui.ferr, |
43117
8ff1ecfadcd1
cleanup: join string literals that are already on one line
Martin von Zweigbergk <martinvonz@google.com>
parents:
43077
diff
changeset
|
790 b'malformed handshake protocol: missing %s' % line, |
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parents:
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diff
changeset
|
791 ) |
36215
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changeset
|
792 ok = False |
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diff
changeset
|
793 state = b'shutdown' |
36215
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parents:
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diff
changeset
|
794 break |
464bedc0fdb4
wireprotoserver: handle SSH protocol version 2 upgrade requests
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parents:
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diff
changeset
|
795 |
464bedc0fdb4
wireprotoserver: handle SSH protocol version 2 upgrade requests
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parents:
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diff
changeset
|
796 if not ok: |
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797 continue |
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798 |
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799 request = fin.read(81) |
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800 if request != b'%s-%s' % (b'0' * 40, b'0' * 40): |
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801 _sshv1respondooberror( |
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802 fout, |
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803 ui.ferr, |
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804 b'malformed handshake protocol: ' |
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805 b'missing between argument value', |
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806 ) |
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807 state = b'shutdown' |
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808 continue |
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809 |
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810 state = b'upgrade-v2-finish' |
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811 continue |
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812 |
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813 elif state == b'upgrade-v2-finish': |
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814 # Send the upgrade response. |
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815 fout.write(b'upgraded %s %s\n' % (token, SSHV2)) |
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816 servercaps = wireprotov1server.capabilities(repo, proto) |
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817 rsp = b'capabilities: %s' % servercaps.data |
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818 fout.write(b'%d\n%s\n' % (len(rsp), rsp)) |
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819 fout.flush() |
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820 |
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821 proto = sshv2protocolhandler(ui, fin, fout) |
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822 protoswitched = True |
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823 |
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824 state = b'protov2-serving' |
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825 continue |
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826 |
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827 elif state == b'shutdown': |
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828 break |
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829 |
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830 else: |
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831 raise error.ProgrammingError( |
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832 b'unhandled ssh server state: %s' % state |
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833 ) |
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834 |
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835 |
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836 class sshserver(object): |
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837 def __init__(self, ui, repo, logfh=None): |
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838 self._ui = ui |
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839 self._repo = repo |
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840 self._fin, self._fout = ui.protectfinout() |
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841 |
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842 # Log write I/O to stdout and stderr if configured. |
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843 if logfh: |
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844 self._fout = util.makeloggingfileobject( |
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845 logfh, self._fout, b'o', logdata=True |
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846 ) |
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847 ui.ferr = util.makeloggingfileobject( |
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848 logfh, ui.ferr, b'e', logdata=True |
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849 ) |
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850 |
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851 def serve_forever(self): |
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852 self.serveuntil(threading.Event()) |
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853 self._ui.restorefinout(self._fin, self._fout) |
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854 sys.exit(0) |
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855 |
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856 def serveuntil(self, ev): |
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857 """Serve until a threading.Event is set.""" |
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858 _runsshserver(self._ui, self._repo, self._fin, self._fout, ev) |