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annotate hgext/lfs/wireprotolfsserver.py @ 37152:cc0a6ea95d98

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lfs: add support for serving blob files
author Matt Harbison <matt_harbison@yahoo.com>
date Sat, 17 Mar 2018 01:53:44 -0400
parents ea6fc58524d7
children dfb38c4850a9
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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 import os
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14
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15 from mercurial.hgweb import (
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16 common as hgwebcommon,
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17 )
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18
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19 from mercurial import (
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20 pycompat,
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21 )
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22
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23 HTTP_OK = hgwebcommon.HTTP_OK
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24 HTTP_CREATED = hgwebcommon.HTTP_CREATED
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25 HTTP_BAD_REQUEST = hgwebcommon.HTTP_BAD_REQUEST
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26
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27 def handlewsgirequest(orig, rctx, req, res, checkperm):
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28 """Wrap wireprotoserver.handlewsgirequest() to possibly process an LFS
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29 request if it is left unprocessed by the wrapped method.
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30 """
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31 if orig(rctx, req, res, checkperm):
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32 return True
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33
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34 if not req.dispatchpath:
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35 return False
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36
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37 try:
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38 if req.dispatchpath == b'.git/info/lfs/objects/batch':
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39 checkperm(rctx, req, 'pull')
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40 return _processbatchrequest(rctx.repo, req, res)
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41 # TODO: reserve and use a path in the proposed http wireprotocol /api/
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42 # namespace?
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43 elif req.dispatchpath.startswith(b'.hg/lfs/objects'):
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44 return _processbasictransfer(rctx.repo, req, res,
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45 lambda perm:
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46 checkperm(rctx, req, perm))
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47 return False
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48 except hgwebcommon.ErrorResponse as e:
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49 # XXX: copied from the handler surrounding wireprotoserver._callhttp()
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50 # in the wrapped function. Should this be moved back to hgweb to
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51 # be a common handler?
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52 for k, v in e.headers:
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53 res.headers[k] = v
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54 res.status = hgwebcommon.statusmessage(e.code, pycompat.bytestr(e))
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55 res.setbodybytes(b'0\n%s\n' % pycompat.bytestr(e))
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56 return True
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57
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58 def _sethttperror(res, code, message=None):
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59 res.status = hgwebcommon.statusmessage(code, message=message)
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60 res.headers[b'Content-Type'] = b'text/plain; charset=utf-8'
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61 res.setbodybytes(b'')
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62
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63 def _processbatchrequest(repo, req, res):
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64 """Handle a request for the Batch API, which is the gateway to granting file
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65 access.
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66
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67 https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
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68 """
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69
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70 # Mercurial client request:
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71 #
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72 # HOST: localhost:$HGPORT
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73 # ACCEPT: application/vnd.git-lfs+json
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74 # ACCEPT-ENCODING: identity
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75 # USER-AGENT: git-lfs/2.3.4 (Mercurial 4.5.2+1114-f48b9754f04c+20180316)
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76 # Content-Length: 125
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77 # Content-Type: application/vnd.git-lfs+json
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78 #
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79 # {
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80 # "objects": [
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81 # {
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82 # "oid": "31cf...8e5b"
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83 # "size": 12
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84 # }
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85 # ]
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86 # "operation": "upload"
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87 # }
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88
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89 if (req.method != b'POST'
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90 or req.headers[b'Content-Type'] != b'application/vnd.git-lfs+json'
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91 or req.headers[b'Accept'] != b'application/vnd.git-lfs+json'):
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92 # TODO: figure out what the proper handling for a bad request to the
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93 # Batch API is.
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94 _sethttperror(res, HTTP_BAD_REQUEST, b'Invalid Batch API request')
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95 return True
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96
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97 # XXX: specify an encoding?
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98 lfsreq = json.loads(req.bodyfh.read())
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99
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100 # If no transfer handlers are explicitly requested, 'basic' is assumed.
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101 if 'basic' not in lfsreq.get('transfers', ['basic']):
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102 _sethttperror(res, HTTP_BAD_REQUEST,
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103 b'Only the basic LFS transfer handler is supported')
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104 return True
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105
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106 operation = lfsreq.get('operation')
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107 if operation not in ('upload', 'download'):
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108 _sethttperror(res, HTTP_BAD_REQUEST,
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109 b'Unsupported LFS transfer operation: %s' % operation)
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110 return True
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111
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112 localstore = repo.svfs.lfslocalblobstore
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113
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114 objects = [p for p in _batchresponseobjects(req, lfsreq.get('objects', []),
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115 operation, localstore)]
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116
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117 rsp = {
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118 'transfer': 'basic',
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119 'objects': objects,
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120 }
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121
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122 res.status = hgwebcommon.statusmessage(HTTP_OK)
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123 res.headers[b'Content-Type'] = b'application/vnd.git-lfs+json'
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124 res.setbodybytes(pycompat.bytestr(json.dumps(rsp)))
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125
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126 return True
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127
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128 def _batchresponseobjects(req, objects, action, store):
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129 """Yield one dictionary of attributes for the Batch API response for each
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130 object in the list.
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131
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132 req: The parsedrequest for the Batch API request
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133 objects: The list of objects in the Batch API object request list
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134 action: 'upload' or 'download'
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135 store: The local blob store for servicing requests"""
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136
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137 # Successful lfs-test-server response to solict an upload:
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138 # {
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139 # u'objects': [{
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140 # u'size': 12,
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141 # u'oid': u'31cf...8e5b',
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142 # u'actions': {
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143 # u'upload': {
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144 # u'href': u'http://localhost:$HGPORT/objects/31cf...8e5b',
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145 # u'expires_at': u'0001-01-01T00:00:00Z',
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146 # u'header': {
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147 # u'Accept': u'application/vnd.git-lfs'
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148 # }
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149 # }
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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 # TODO: Sort out the expires_at/expires_in/authenticated keys.
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155
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156 for obj in objects:
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157 # Convert unicode to ASCII to create a filesystem path
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158 oid = obj.get('oid').encode('ascii')
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159 rsp = {
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160 'oid': oid,
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161 'size': obj.get('size'), # XXX: should this check the local size?
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162 #'authenticated': True,
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163 }
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164
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165 exists = True
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166 verifies = False
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167
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168 # Verify an existing file on the upload request, so that the client is
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169 # solicited to re-upload if it corrupt locally. Download requests are
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170 # also verified, so the error can be flagged in the Batch API response.
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171 # (Maybe we can use this to short circuit the download for `hg verify`,
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172 # IFF the client can assert that the remote end is an hg server.)
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173 # Otherwise, it's potentially overkill on download, since it is also
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174 # verified as the file is streamed to the caller.
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175 try:
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176 verifies = store.verify(oid)
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177 except IOError as inst:
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178 if inst.errno != errno.ENOENT:
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179 rsp['error'] = {
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180 'code': 500,
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181 'message': inst.strerror or 'Internal Server Server'
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182 }
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183 yield rsp
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184 continue
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185
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186 exists = False
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187
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188 # Items are always listed for downloads. They are dropped for uploads
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189 # IFF they already exist locally.
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190 if action == 'download':
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191 if not exists:
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192 rsp['error'] = {
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193 'code': 404,
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194 'message': "The object does not exist"
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195 }
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196 yield rsp
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197 continue
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198
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199 elif not verifies:
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200 rsp['error'] = {
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201 'code': 422, # XXX: is this the right code?
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202 'message': "The object is corrupt"
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203 }
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204 yield rsp
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205 continue
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206
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207 elif verifies:
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208 yield rsp # Skip 'actions': already uploaded
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209 continue
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210
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diff changeset
211 expiresat = datetime.datetime.now() + datetime.timedelta(minutes=10)
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diff changeset
212
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213 rsp['actions'] = {
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diff changeset
214 '%s' % action: {
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215 # TODO: Account for the --prefix, if any.
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216 'href': '%s/.hg/lfs/objects/%s' % (req.baseurl, oid),
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diff changeset
217 # datetime.isoformat() doesn't include the 'Z' suffix
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diff changeset
218 "expires_at": expiresat.strftime('%Y-%m-%dT%H:%M:%SZ'),
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diff changeset
219 'header': {
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diff changeset
220 # The spec doesn't mention the Accept header here, but avoid
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diff changeset
221 # a gratuitous deviation from lfs-test-server in the test
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222 # output.
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diff changeset
223 'Accept': 'application/vnd.git-lfs'
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224 }
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parents: 37150
diff changeset
225 }
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diff changeset
226 }
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diff changeset
227
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diff changeset
228 yield rsp
37150
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parents:
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229
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parents:
diff changeset
230 def _processbasictransfer(repo, req, res, checkperm):
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parents:
diff changeset
231 """Handle a single file upload (PUT) or download (GET) action for the Basic
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parents:
diff changeset
232 Transfer Adapter.
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parents:
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233
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parents:
diff changeset
234 After determining if the request is for an upload or download, the access
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parents:
diff changeset
235 must be checked by calling ``checkperm()`` with either 'pull' or 'upload'
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parents:
diff changeset
236 before accessing the files.
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parents:
diff changeset
237
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parents:
diff changeset
238 https://github.com/git-lfs/git-lfs/blob/master/docs/api/basic-transfers.md
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parents:
diff changeset
239 """
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parents:
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240
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parents:
diff changeset
241 method = req.method
37152
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diff changeset
242 oid = os.path.basename(req.dispatchpath)
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parents: 37151
diff changeset
243 localstore = repo.svfs.lfslocalblobstore
37150
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parents:
diff changeset
244
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parents:
diff changeset
245 if method == b'PUT':
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parents:
diff changeset
246 checkperm('upload')
37152
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diff changeset
247
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diff changeset
248 # TODO: verify Content-Type?
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diff changeset
249
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diff changeset
250 existed = localstore.has(oid)
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diff changeset
251
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diff changeset
252 # TODO: how to handle timeouts? The body proxy handles limiting to
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diff changeset
253 # Content-Length, but what happens if a client sends less than it
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diff changeset
254 # says it will?
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diff changeset
255
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parents: 37151
diff changeset
256 # TODO: download() will abort if the checksum fails. It should raise
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diff changeset
257 # something checksum specific that can be caught here, and turned
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diff changeset
258 # into an http code.
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diff changeset
259 localstore.download(oid, req.bodyfh)
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diff changeset
260
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diff changeset
261 statusmessage = hgwebcommon.statusmessage
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diff changeset
262 res.status = statusmessage(HTTP_OK if existed else HTTP_CREATED)
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diff changeset
263
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diff changeset
264 # There's no payload here, but this is the header that lfs-test-server
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diff changeset
265 # sends back. This eliminates some gratuitous test output conditionals.
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266 res.headers[b'Content-Type'] = b'text/plain; charset=utf-8'
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267 res.setbodybytes(b'')
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268
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269 return True
37150
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270 elif method == b'GET':
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271 checkperm('pull')
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272
37152
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273 res.status = hgwebcommon.statusmessage(HTTP_OK)
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274 res.headers[b'Content-Type'] = b'application/octet-stream'
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275
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276 # TODO: figure out how to send back the file in chunks, instead of
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277 # reading the whole thing.
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278 res.setbodybytes(localstore.read(oid))
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279
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280 return True
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281 else:
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282 _sethttperror(res, HTTP_BAD_REQUEST,
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283 message=b'Unsupported LFS transfer method: %s' % method)
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284 return True