rhodecode/lib/middleware/simplegit.py

# -*- coding: utf-8 -*-

# Copyright (C) 2010-2017 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

"""
SimpleGit middleware for handling git protocol request (push/clone etc.)
It's implemented with basic auth function
"""
import os
import re
import logging
import urlparse

import rhodecode
from rhodecode.lib import utils2
from rhodecode.lib.middleware import simplevcs

log = logging.getLogger(__name__)


GIT_PROTO_PAT = re.compile(
    r'^/(.+)/(info/refs|info/lfs/(.+)|git-upload-pack|git-receive-pack)')
GIT_LFS_PROTO_PAT = re.compile(r'^/(.+)/(info/lfs/(.+))')


def default_lfs_store():
    """
    Default lfs store location, it's consistent with Mercurials large file
    store which is in .cache/largefiles
    """
    from rhodecode.lib.vcs.backends.git import lfs_store
    user_home = os.path.expanduser("~")
    return lfs_store(user_home)


class SimpleGit(simplevcs.SimpleVCS):

    SCM = 'git'

    def _get_repository_name(self, environ):
        """
        Gets repository name out of PATH_INFO header

        :param environ: environ where PATH_INFO is stored
        """
        repo_name = GIT_PROTO_PAT.match(environ['PATH_INFO']).group(1)
        # for GIT LFS, and bare format strip .git suffix from names
        if repo_name.endswith('.git'):
            repo_name = repo_name[:-4]
        return repo_name

    def _get_lfs_action(self, path, request_method):
        """
        return an action based on LFS requests type.
        Those routes are handled inside vcsserver app.

        batch           -> POST to /info/lfs/objects/batch  => PUSH/PULL
                        batch is based on the `operation.
                        that could be download or upload, but those are only
                        instructions to fetch so we return pull always

        download        -> GET  to /info/lfs/{oid}          => PULL
        upload          -> PUT  to /info/lfs/{oid}          => PUSH

        verification    -> POST to /info/lfs/verify         => PULL

        """

        match_obj = GIT_LFS_PROTO_PAT.match(path)
        _parts = match_obj.groups()
        repo_name, path, operation = _parts
        log.debug(
            'LFS: detecting operation based on following '
            'data: %s, req_method:%s', _parts, request_method)

        if operation == 'verify':
            return 'pull'
        elif operation == 'objects/batch':
            # batch sends back instructions for API to dl/upl we report it
            # as pull
            if request_method == 'POST':
                return 'pull'

        elif operation:
            # probably a OID, upload  is PUT, download a GET
            if request_method == 'GET':
                return 'pull'
            else:
                return 'push'

        # if default not found require push, as action
        return 'push'

    _ACTION_MAPPING = {
        'git-receive-pack': 'push',
        'git-upload-pack': 'pull',
    }

    def _get_action(self, environ):
        """
        Maps git request commands into a pull or push command.
        In case of unknown/unexpected data, it returns 'pull' to be safe.

        :param environ:
        """
        path = environ['PATH_INFO']

        if path.endswith('/info/refs'):
            query = urlparse.parse_qs(environ['QUERY_STRING'])
            service_cmd = query.get('service', [''])[0]
            return self._ACTION_MAPPING.get(service_cmd, 'pull')

        elif GIT_LFS_PROTO_PAT.match(environ['PATH_INFO']):
            return self._get_lfs_action(
                environ['PATH_INFO'], environ['REQUEST_METHOD'])

        elif path.endswith('/git-receive-pack'):
            return 'push'
        elif path.endswith('/git-upload-pack'):
            return 'pull'

        return 'pull'

    def _create_wsgi_app(self, repo_path, repo_name, config):
        return self.scm_app.create_git_wsgi_app(
            repo_path, repo_name, config)

    def _create_config(self, extras, repo_name):
        extras['git_update_server_info'] = utils2.str2bool(
            rhodecode.CONFIG.get('git_update_server_info'))

        # TODO(marcink): controll this via DB settings, store and enabled-per
        # repo settings

        extras['git_lfs_enabled'] = True
        extras['git_lfs_store_path'] = default_lfs_store()
        return extras