def handlewsgirequest(orig, rctx, req, res, checkperm):
"""Wrap wireprotoserver.handlewsgirequest() to possibly process an LFS
request if it is left unprocessed by the wrapped method.
"""
if orig(rctx, req, res, checkperm):
return True
if not rctx.repo.ui.configbool(b'experimental', b'lfs.serve'):
return False
if not util.safehasattr(rctx.repo.svfs, 'lfslocalblobstore'):
return False
if not req.dispatchpath:
return False
try:
if req.dispatchpath == b'.git/info/lfs/objects/batch':
checkperm(rctx, req, b'pull')
return _processbatchrequest(rctx.repo, req, res)
# TODO: reserve and use a path in the proposed http wireprotocol /api/
# namespace?
elif req.dispatchpath.startswith(b'.hg/lfs/objects'):
return _processbasictransfer(
rctx.repo, req, res, lambda perm: checkperm(rctx, req, perm))
return False
except hgwebcommon.ErrorResponse as e:
# XXX: copied from the handler surrounding wireprotoserver._callhttp()
# in the wrapped function. Should this be moved back to hgweb to
# be a common handler?
for k, v in e.headers:
res.headers[k] = v
res.status = hgwebcommon.statusmessage(e.code, pycompat.bytestr(e))
res.setbodybytes(b'0\n%s\n' % pycompat.bytestr(e))
return True
def _runwsgi(self, req, res, repo):
cmd = req.qsparams.get('cmd', '')
if not mercurial.wireprotoserver.iscmd(cmd):
# NOTE(marcink): for unsupported commands, we return bad request
# internally from HG
from mercurial.hgweb.common import statusmessage
res.status = statusmessage(mercurial.hgweb.common.HTTP_BAD_REQUEST)
res.setbodybytes('')
return res.sendresponse()
return super(HgWeb, self)._runwsgi(req, res, repo)
def _processbatchrequest(repo, req, res):
"""Handle a request for the Batch API, which is the gateway to granting file
access.
https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
"""
# Mercurial client request:
#
# HOST: localhost:$HGPORT
# ACCEPT: application/vnd.git-lfs+json
# ACCEPT-ENCODING: identity
# USER-AGENT: git-lfs/2.3.4 (Mercurial 4.5.2+1114-f48b9754f04c+20180316)
# Content-Length: 125
# Content-Type: application/vnd.git-lfs+json
#
# {
# "objects": [
# {
# "oid": "31cf...8e5b"
# "size": 12
# }
# ]
# "operation": "upload"
# }
if req.method != b'POST':
_sethttperror(res, HTTP_METHOD_NOT_ALLOWED)
return True
if req.headers[b'Content-Type'] != b'application/vnd.git-lfs+json':
_sethttperror(res, HTTP_UNSUPPORTED_MEDIA_TYPE)
return True
if req.headers[b'Accept'] != b'application/vnd.git-lfs+json':
_sethttperror(res, HTTP_NOT_ACCEPTABLE)
return True
# XXX: specify an encoding?
lfsreq = pycompat.json_loads(req.bodyfh.read())
# If no transfer handlers are explicitly requested, 'basic' is assumed.
if r'basic' not in lfsreq.get(r'transfers', [r'basic']):
_sethttperror(
res,
HTTP_BAD_REQUEST,
b'Only the basic LFS transfer handler is supported',
)
return True
operation = lfsreq.get(r'operation')
operation = pycompat.bytestr(operation)
if operation not in (b'upload', b'download'):
_sethttperror(
res,
HTTP_BAD_REQUEST,
b'Unsupported LFS transfer operation: %s' % operation,
)
return True
localstore = repo.svfs.lfslocalblobstore
objects = [
p for p in _batchresponseobjects(req, lfsreq.get(r'objects', []),
operation, localstore)
]
rsp = {
r'transfer': r'basic',
r'objects': objects,
}
res.status = hgwebcommon.statusmessage(HTTP_OK)
res.headers[b'Content-Type'] = b'application/vnd.git-lfs+json'
res.setbodybytes(pycompat.bytestr(json.dumps(rsp)))
return True
def _sethttperror(res, code, message=None):
res.status = hgwebcommon.statusmessage(code, message=message)
res.headers[b'Content-Type'] = b'text/plain; charset=utf-8'
res.setbodybytes(b'')
def _processbasictransfer(repo, req, res, checkperm):
"""Handle a single file upload (PUT) or download (GET) action for the Basic
Transfer Adapter.
After determining if the request is for an upload or download, the access
must be checked by calling ``checkperm()`` with either 'pull' or 'upload'
before accessing the files.
https://github.com/git-lfs/git-lfs/blob/master/docs/api/basic-transfers.md
"""
method = req.method
oid = req.dispatchparts[-1]
localstore = repo.svfs.lfslocalblobstore
if len(req.dispatchparts) != 4:
_sethttperror(res, HTTP_NOT_FOUND)
return True
if method == b'PUT':
checkperm(b'upload')
# TODO: verify Content-Type?
existed = localstore.has(oid)
# TODO: how to handle timeouts? The body proxy handles limiting to
# Content-Length, but what happens if a client sends less than it
# says it will?
statusmessage = hgwebcommon.statusmessage
try:
localstore.download(oid, req.bodyfh)
res.status = statusmessage(HTTP_OK if existed else HTTP_CREATED)
except blobstore.LfsCorruptionError:
_logexception(req)
# XXX: Is this the right code?
res.status = statusmessage(422, b'corrupt blob')
# There's no payload here, but this is the header that lfs-test-server
# sends back. This eliminates some gratuitous test output conditionals.
res.headers[b'Content-Type'] = b'text/plain; charset=utf-8'
res.setbodybytes(b'')
return True
elif method == b'GET':
checkperm(b'pull')
res.status = hgwebcommon.statusmessage(HTTP_OK)
res.headers[b'Content-Type'] = b'application/octet-stream'
try:
# TODO: figure out how to send back the file in chunks, instead of
# reading the whole thing. (Also figure out how to send back
# an error status if an IOError occurs after a partial write
# in that case. Here, everything is read before starting.)
res.setbodybytes(localstore.read(oid))
except blobstore.LfsCorruptionError:
_logexception(req)
# XXX: Is this the right code?
res.status = hgwebcommon.statusmessage(422, b'corrupt blob')
res.setbodybytes(b'')
return True
else:
_sethttperror(
res,
HTTP_METHOD_NOT_ALLOWED,
message=b'Unsupported LFS transfer method: %s' % method,
)
return True
