Mercurial > public > mercurial-scm > hg-stable

annotate hgext/lfs/wireprotolfsserver.py @ 37251:fe061e47a2cf

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lfs: avoid an improper usage of os.path.basename() to parse a URI
author Matt Harbison <matt_harbison@yahoo.com>
date Sat, 31 Mar 2018 23:47:56 -0400
parents dfb38c4850a9
children 9640ccf44ac0
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1 # wireprotolfsserver.py - lfs protocol server side implementation
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2 #
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3 # Copyright 2018 Matt Harbison <matt_harbison@yahoo.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import datetime
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11 import errno
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12 import json
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13
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14 from mercurial.hgweb import (
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15 common as hgwebcommon,
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16 )
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17
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18 from mercurial import (
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19 pycompat,
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20 )
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21
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22 HTTP_OK = hgwebcommon.HTTP_OK
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23 HTTP_CREATED = hgwebcommon.HTTP_CREATED
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24 HTTP_BAD_REQUEST = hgwebcommon.HTTP_BAD_REQUEST
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25
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26 def handlewsgirequest(orig, rctx, req, res, checkperm):
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27 """Wrap wireprotoserver.handlewsgirequest() to possibly process an LFS
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28 request if it is left unprocessed by the wrapped method.
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29 """
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30 if orig(rctx, req, res, checkperm):
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31 return True
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32
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33 if not rctx.repo.ui.configbool('experimental', 'lfs.serve'):
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34 return False
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35
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36 if not req.dispatchpath:
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37 return False
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38
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39 try:
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40 if req.dispatchpath == b'.git/info/lfs/objects/batch':
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41 checkperm(rctx, req, 'pull')
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42 return _processbatchrequest(rctx.repo, req, res)
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43 # TODO: reserve and use a path in the proposed http wireprotocol /api/
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44 # namespace?
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45 elif req.dispatchpath.startswith(b'.hg/lfs/objects'):
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46 return _processbasictransfer(rctx.repo, req, res,
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47 lambda perm:
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48 checkperm(rctx, req, perm))
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49 return False
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50 except hgwebcommon.ErrorResponse as e:
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51 # XXX: copied from the handler surrounding wireprotoserver._callhttp()
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52 # in the wrapped function. Should this be moved back to hgweb to
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53 # be a common handler?
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54 for k, v in e.headers:
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55 res.headers[k] = v
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56 res.status = hgwebcommon.statusmessage(e.code, pycompat.bytestr(e))
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57 res.setbodybytes(b'0\n%s\n' % pycompat.bytestr(e))
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58 return True
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59
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60 def _sethttperror(res, code, message=None):
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61 res.status = hgwebcommon.statusmessage(code, message=message)
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62 res.headers[b'Content-Type'] = b'text/plain; charset=utf-8'
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63 res.setbodybytes(b'')
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64
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65 def _processbatchrequest(repo, req, res):
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66 """Handle a request for the Batch API, which is the gateway to granting file
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67 access.
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68
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69 https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
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70 """
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71
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72 # Mercurial client request:
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73 #
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74 # HOST: localhost:$HGPORT
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75 # ACCEPT: application/vnd.git-lfs+json
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76 # ACCEPT-ENCODING: identity
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77 # USER-AGENT: git-lfs/2.3.4 (Mercurial 4.5.2+1114-f48b9754f04c+20180316)
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78 # Content-Length: 125
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79 # Content-Type: application/vnd.git-lfs+json
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80 #
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81 # {
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82 # "objects": [
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83 # {
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84 # "oid": "31cf...8e5b"
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85 # "size": 12
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86 # }
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87 # ]
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88 # "operation": "upload"
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89 # }
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90
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91 if (req.method != b'POST'
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92 or req.headers[b'Content-Type'] != b'application/vnd.git-lfs+json'
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93 or req.headers[b'Accept'] != b'application/vnd.git-lfs+json'):
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94 # TODO: figure out what the proper handling for a bad request to the
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95 # Batch API is.
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96 _sethttperror(res, HTTP_BAD_REQUEST, b'Invalid Batch API request')
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97 return True
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98
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99 # XXX: specify an encoding?
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100 lfsreq = json.loads(req.bodyfh.read())
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101
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102 # If no transfer handlers are explicitly requested, 'basic' is assumed.
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103 if 'basic' not in lfsreq.get('transfers', ['basic']):
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104 _sethttperror(res, HTTP_BAD_REQUEST,
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105 b'Only the basic LFS transfer handler is supported')
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106 return True
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107
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108 operation = lfsreq.get('operation')
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109 if operation not in ('upload', 'download'):
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110 _sethttperror(res, HTTP_BAD_REQUEST,
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111 b'Unsupported LFS transfer operation: %s' % operation)
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112 return True
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113
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114 localstore = repo.svfs.lfslocalblobstore
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115
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116 objects = [p for p in _batchresponseobjects(req, lfsreq.get('objects', []),
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117 operation, localstore)]
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118
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119 rsp = {
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120 'transfer': 'basic',
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121 'objects': objects,
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122 }
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123
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124 res.status = hgwebcommon.statusmessage(HTTP_OK)
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125 res.headers[b'Content-Type'] = b'application/vnd.git-lfs+json'
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126 res.setbodybytes(pycompat.bytestr(json.dumps(rsp)))
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127
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128 return True
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129
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130 def _batchresponseobjects(req, objects, action, store):
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131 """Yield one dictionary of attributes for the Batch API response for each
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132 object in the list.
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133
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134 req: The parsedrequest for the Batch API request
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135 objects: The list of objects in the Batch API object request list
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136 action: 'upload' or 'download'
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137 store: The local blob store for servicing requests"""
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138
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139 # Successful lfs-test-server response to solict an upload:
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140 # {
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141 # u'objects': [{
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142 # u'size': 12,
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143 # u'oid': u'31cf...8e5b',
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144 # u'actions': {
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145 # u'upload': {
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146 # u'href': u'http://localhost:$HGPORT/objects/31cf...8e5b',
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147 # u'expires_at': u'0001-01-01T00:00:00Z',
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148 # u'header': {
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149 # u'Accept': u'application/vnd.git-lfs'
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150 # }
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151 # }
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152 # }
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153 # }]
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154 # }
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155
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156 # TODO: Sort out the expires_at/expires_in/authenticated keys.
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157
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158 for obj in objects:
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159 # Convert unicode to ASCII to create a filesystem path
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160 oid = obj.get('oid').encode('ascii')
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161 rsp = {
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162 'oid': oid,
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163 'size': obj.get('size'), # XXX: should this check the local size?
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164 #'authenticated': True,
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165 }
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166
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167 exists = True
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168 verifies = False
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169
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170 # Verify an existing file on the upload request, so that the client is
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171 # solicited to re-upload if it corrupt locally. Download requests are
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172 # also verified, so the error can be flagged in the Batch API response.
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173 # (Maybe we can use this to short circuit the download for `hg verify`,
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174 # IFF the client can assert that the remote end is an hg server.)
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175 # Otherwise, it's potentially overkill on download, since it is also
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176 # verified as the file is streamed to the caller.
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177 try:
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178 verifies = store.verify(oid)
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179 except IOError as inst:
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180 if inst.errno != errno.ENOENT:
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181 rsp['error'] = {
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182 'code': 500,
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183 'message': inst.strerror or 'Internal Server Server'
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184 }
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185 yield rsp
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186 continue
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187
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188 exists = False
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189
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190 # Items are always listed for downloads. They are dropped for uploads
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191 # IFF they already exist locally.
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192 if action == 'download':
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193 if not exists:
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194 rsp['error'] = {
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195 'code': 404,
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196 'message': "The object does not exist"
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197 }
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198 yield rsp
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199 continue
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200
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201 elif not verifies:
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202 rsp['error'] = {
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203 'code': 422, # XXX: is this the right code?
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204 'message': "The object is corrupt"
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205 }
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206 yield rsp
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207 continue
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208
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209 elif verifies:
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210 yield rsp # Skip 'actions': already uploaded
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211 continue
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212
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diff changeset
213 expiresat = datetime.datetime.now() + datetime.timedelta(minutes=10)
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214
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215 rsp['actions'] = {
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216 '%s' % action: {
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217 # TODO: Account for the --prefix, if any.
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diff changeset
218 'href': '%s/.hg/lfs/objects/%s' % (req.baseurl, oid),
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diff changeset
219 # datetime.isoformat() doesn't include the 'Z' suffix
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diff changeset
220 "expires_at": expiresat.strftime('%Y-%m-%dT%H:%M:%SZ'),
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diff changeset
221 'header': {
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diff changeset
222 # The spec doesn't mention the Accept header here, but avoid
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diff changeset
223 # a gratuitous deviation from lfs-test-server in the test
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224 # output.
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diff changeset
225 'Accept': 'application/vnd.git-lfs'
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226 }
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diff changeset
227 }
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228 }
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diff changeset
229
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diff changeset
230 yield rsp
37150
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parents:
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231
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parents:
diff changeset
232 def _processbasictransfer(repo, req, res, checkperm):
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parents:
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233 """Handle a single file upload (PUT) or download (GET) action for the Basic
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parents:
diff changeset
234 Transfer Adapter.
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parents:
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235
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parents:
diff changeset
236 After determining if the request is for an upload or download, the access
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parents:
diff changeset
237 must be checked by calling ``checkperm()`` with either 'pull' or 'upload'
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parents:
diff changeset
238 before accessing the files.
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parents:
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239
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parents:
diff changeset
240 https://github.com/git-lfs/git-lfs/blob/master/docs/api/basic-transfers.md
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parents:
diff changeset
241 """
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parents:
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242
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parents:
diff changeset
243 method = req.method
37251
fe061e47a2cf lfs: avoid an improper usage of os.path.basename() to parse a URI
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diff changeset
244 oid = req.dispatchparts[-1]
37152
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diff changeset
245 localstore = repo.svfs.lfslocalblobstore
37150
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parents:
diff changeset
246
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parents:
diff changeset
247 if method == b'PUT':
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parents:
diff changeset
248 checkperm('upload')
37152
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diff changeset
249
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diff changeset
250 # TODO: verify Content-Type?
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diff changeset
251
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diff changeset
252 existed = localstore.has(oid)
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diff changeset
253
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diff changeset
254 # TODO: how to handle timeouts? The body proxy handles limiting to
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diff changeset
255 # Content-Length, but what happens if a client sends less than it
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diff changeset
256 # says it will?
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diff changeset
257
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diff changeset
258 # TODO: download() will abort if the checksum fails. It should raise
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diff changeset
259 # something checksum specific that can be caught here, and turned
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diff changeset
260 # into an http code.
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diff changeset
261 localstore.download(oid, req.bodyfh)
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diff changeset
262
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diff changeset
263 statusmessage = hgwebcommon.statusmessage
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diff changeset
264 res.status = statusmessage(HTTP_OK if existed else HTTP_CREATED)
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parents: 37151
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265
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266 # There's no payload here, but this is the header that lfs-test-server
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267 # sends back. This eliminates some gratuitous test output conditionals.
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268 res.headers[b'Content-Type'] = b'text/plain; charset=utf-8'
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269 res.setbodybytes(b'')
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270
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271 return True
37150
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272 elif method == b'GET':
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273 checkperm('pull')
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274
37152
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275 res.status = hgwebcommon.statusmessage(HTTP_OK)
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276 res.headers[b'Content-Type'] = b'application/octet-stream'
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277
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278 # TODO: figure out how to send back the file in chunks, instead of
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279 # reading the whole thing.
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280 res.setbodybytes(localstore.read(oid))
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281
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282 return True
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283 else:
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284 _sethttperror(res, HTTP_BAD_REQUEST,
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285 message=b'Unsupported LFS transfer method: %s' % method)
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286 return True