/brz/remove-bazaar

# Copyright (C) 2018 Breezy Developers

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# 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 General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Support for GitLab."""

from __future__ import absolute_import

from ... import (

    branch as _mod_branch,

    controldir,

    errors,

    urlutils,

    )

from ...config import AuthenticationConfig

from ...git.urls import git_url_to_bzr_url

from ...sixish import PY3

from .propose import (

    Hoster,

    MergeProposal,

    MergeProposalBuilder,

    MergeProposalExists,

    NoSuchProject,

    PrerequisiteBranchUnsupported,

    UnsupportedHoster,

    )

def mp_status_to_status(status):

    return {

        'all': 'all',

        'open': 'opened',

        'merged': 'merged',

        'closed': 'closed'}[status]

class NotGitLabUrl(errors.BzrError):

    _fmt = "Not a GitLab URL: %(url)s"

    def __init__(self, url):

        errors.BzrError.__init__(self)

        self.url = url

class DifferentGitLabInstances(errors.BzrError):

    _fmt = ("Can't create merge proposals across GitLab instances: "

            "%(source_host)s and %(target_host)s")

    def __init__(self, source_host, target_host):

        self.source_host = source_host

        self.target_host = target_host

class GitLabLoginMissing(errors.BzrError):

    _fmt = ("Please log into GitLab")

def default_config_path():

    from breezy.config import config_dir

    import os

    return os.path.join(config_dir(), 'gitlab.conf')

def store_gitlab_token(name, url, private_token):

    """Store a GitLab token in a configuration file."""

    import configparser

    config = configparser.ConfigParser()

    path = default_config_path()

    config.read([path])

    config.add_section(name)

    config[name]['url'] = url

    config[name]['private_token'] = private_token

    with open(path, 'w') as f:

        config.write(f)

def iter_tokens():

    import configparser

    from gitlab.config import _DEFAULT_FILES

    config = configparser.ConfigParser()

    config.read(_DEFAULT_FILES + [default_config_path()])

    for name, section in config.items():

        yield name, section

def connect_gitlab(host):

    from gitlab import Gitlab, GitlabGetError

    auth = AuthenticationConfig()

    url = 'https://%s' % host

    credentials = auth.get_credentials('https', host)

    if credentials is None:

        for name, section in iter_tokens():

            if section.get('url') == url:

                credentials = section

                break

        else:

            try:

                return Gitlab(url)

            except GitlabGetError:

                raise GitLabLoginMissing()

    else:

        credentials['url'] = url

    return Gitlab(**credentials)

def parse_gitlab_url(branch):

    url = urlutils.split_segment_parameters(branch.user_url)[0]

    (scheme, user, password, host, port, path) = urlutils.parse_url(

        url)

    if scheme not in ('git+ssh', 'https', 'http'):

        raise NotGitLabUrl(branch.user_url)

    if not host:

        raise NotGitLabUrl(branch.user_url)

    path = path.strip('/')

    if path.endswith('.git'):

        path = path[:-4]

    return host, path, branch.name

class GitLabMergeProposal(MergeProposal):

    def __init__(self, mr):

        self._mr = mr

    @property

    def url(self):

        return self._mr.web_url

    def get_description(self):

        return self._mr.description

    def set_description(self, description):

        self._mr.description = description

        self._mr.save()

    def _branch_url_from_project(self, project_id, branch_name):

        project = self._mr.manager.gitlab.projects.get(project_id)

        return gitlab_url_to_bzr_url(project.http_url_to_repo, branch_name)

    def get_source_branch_url(self):

        return self._branch_url_from_project(

            self._mr.source_project_id, self._mr.source_branch)

    def get_target_branch_url(self):

        return self._branch_url_from_project(

            self._mr.target_project_id, self._mr.target_branch)

    def is_merged(self):

        return (self._mr.state == 'merged')

    def close(self):

        self._mr.state_event = 'close'

        self._mr.save()

def gitlab_url_to_bzr_url(url, name):

    if not PY3:

        name = name.encode('utf-8')

    return urlutils.join_segment_parameters(

        git_url_to_bzr_url(url), {"branch": name})

class GitLab(Hoster):

    """GitLab hoster implementation."""

    supports_merge_proposal_labels = True

    def __repr__(self):

        return "<GitLab(%r)>" % self.gl.url

    @property

    def base_url(self):

        return self.gl.url

    def __init__(self, gl):

        self.gl = gl

    def get_push_url(self, branch):

        (host, project_name, branch_name) = parse_gitlab_url(branch)

        project = self.gl.projects.get(project_name)

        return gitlab_url_to_bzr_url(

            project.ssh_url_to_repo, branch_name)

    def publish_derived(self, local_branch, base_branch, name, project=None,

                        owner=None, revision_id=None, overwrite=False,

                        allow_lossy=True):

        import gitlab

        (host, base_project, base_branch_name) = parse_gitlab_url(base_branch)

        self.gl.auth()

        try:

            base_project = self.gl.projects.get(base_project)

        except gitlab.GitlabGetError as e:

            if e.response_code == 404:

                raise NoSuchProject(base_project)

            else:

                raise

        if owner is None:

            owner = self.gl.user.username

        if project is None:

            project = base_project.path

        try:

            target_project = self.gl.projects.get('%s/%s' % (owner, project))

        except gitlab.GitlabGetError as e:

            if e.response_code == 404:

                target_project = base_project.forks.create({})

            else:

                raise

        remote_repo_url = git_url_to_bzr_url(target_project.ssh_url_to_repo)

        remote_dir = controldir.ControlDir.open(remote_repo_url)

        try:

            push_result = remote_dir.push_branch(

                local_branch, revision_id=revision_id, overwrite=overwrite,

                name=name)

        except errors.NoRoundtrippingSupport:

            if not allow_lossy:

                raise

            push_result = remote_dir.push_branch(

                local_branch, revision_id=revision_id, overwrite=overwrite,

                name=name, lossy=True)

        public_url = gitlab_url_to_bzr_url(

            target_project.http_url_to_repo, name)

        return push_result.target_branch, public_url

    def get_derived_branch(self, base_branch, name, project=None, owner=None):

        import gitlab

        (host, base_project, base_branch_name) = parse_gitlab_url(base_branch)

        self.gl.auth()

        try:

            base_project = self.gl.projects.get(base_project)

        except gitlab.GitlabGetError as e:

            if e.response_code == 404:

                raise NoSuchProject(base_project)

            else:

                raise

        if owner is None:

            owner = self.gl.user.username

        if project is None:

            project = base_project.path

        try:

            target_project = self.gl.projects.get('%s/%s' % (owner, project))

        except gitlab.GitlabGetError as e:

            if e.response_code == 404:

                raise errors.NotBranchError('%s/%s/%s' % (self.gl.url, owner, project))

            raise

        return _mod_branch.Branch.open(gitlab_url_to_bzr_url(

            target_project.ssh_url_to_repo, name))

    def get_proposer(self, source_branch, target_branch):

        return GitlabMergeProposalBuilder(self.gl, source_branch, target_branch)

    def iter_proposals(self, source_branch, target_branch, status):

        import gitlab

        (source_host, source_project_name, source_branch_name) = (

            parse_gitlab_url(source_branch))

        (target_host, target_project_name, target_branch_name) = (

            parse_gitlab_url(target_branch))

        if source_host != target_host:

            raise DifferentGitLabInstances(source_host, target_host)

        self.gl.auth()

        source_project = self.gl.projects.get(source_project_name)

        target_project = self.gl.projects.get(target_project_name)

        state = mp_status_to_status(status)

        try:

            for mr in target_project.mergerequests.list(state=state):

                if (mr.source_project_id != source_project.id or

                        mr.source_branch != source_branch_name or

                        mr.target_project_id != target_project.id or

                        mr.target_branch != target_branch_name):

                    continue

                yield GitLabMergeProposal(mr)

        except gitlab.GitlabListError as e:

            if e.response_code == 403:

                raise errors.PermissionDenied(e.error_message)

    def hosts(self, branch):

        try:

            (host, project, branch_name) = parse_gitlab_url(branch)

        except NotGitLabUrl:

            return False

        return (self.gl.url == ('https://%s' % host))

    @classmethod

    def probe(cls, branch):

        try:

            (host, project, branch_name) = parse_gitlab_url(branch)

        except NotGitLabUrl:

            raise UnsupportedHoster(branch)

        import gitlab

        import requests.exceptions

        try:

            gl = connect_gitlab(host)

            gl.auth()

        except requests.exceptions.SSLError:

            # Well, I guess it could be..

            raise UnsupportedHoster(branch)

        except gitlab.GitlabGetError:

            raise UnsupportedHoster(branch)

        except gitlab.GitlabHttpError as e:

            if e.response_code in (404, 405, 503):

                raise UnsupportedHoster(branch)

            else:

                raise

        return cls(gl)

    @classmethod

    def iter_instances(cls):

        from gitlab import Gitlab

        for name, credentials in iter_tokens():

            if 'url' not in credentials:

                continue

            gl = Gitlab(**credentials)

            yield cls(gl)

    def iter_my_proposals(self, status='open'):

        state = mp_status_to_status(status)

        self.gl.auth()

        for mp in self.gl.mergerequests.list(

                owner=self.gl.user.username, state=state):

            yield GitLabMergeProposal(mp)

class GitlabMergeProposalBuilder(MergeProposalBuilder):

    def __init__(self, gl, source_branch, target_branch):

        self.gl = gl

        self.source_branch = source_branch

        (self.source_host, self.source_project_name, self.source_branch_name) = (

            parse_gitlab_url(source_branch))

        self.target_branch = target_branch

        (self.target_host, self.target_project_name, self.target_branch_name) = (

            parse_gitlab_url(target_branch))

        if self.source_host != self.target_host:

            raise DifferentGitLabInstances(self.source_host, self.target_host)

    def get_infotext(self):

        """Determine the initial comment for the merge proposal."""

        info = []

        info.append("Gitlab instance: %s\n" % self.target_host)

        info.append("Source: %s\n" % self.source_branch.user_url)

        info.append("Target: %s\n" % self.target_branch.user_url)

        return ''.join(info)

    def get_initial_body(self):

        """Get a body for the proposal for the user to modify.

        :return: a str or None.

        """

        return None

    def create_proposal(self, description, reviewers=None, labels=None,

                        prerequisite_branch=None):

        """Perform the submission."""

        if prerequisite_branch is not None:

            raise PrerequisiteBranchUnsupported(self)

        import gitlab

        # TODO(jelmer): Support reviewers

        self.gl.auth()

        source_project = self.gl.projects.get(self.source_project_name)

        target_project = self.gl.projects.get(self.target_project_name)

        # TODO(jelmer): Allow setting title explicitly

        title = description.splitlines()[0]

        # TODO(jelmer): Allow setting allow_collaboration field

        # TODO(jelmer): Allow setting milestone field

        # TODO(jelmer): Allow setting squash field

        kwargs = {

            'title': title,

            'target_project_id': target_project.id,

            'source_branch': self.source_branch_name,

            'target_branch': self.target_branch_name,

            'description': description}

        if labels:

            kwargs['labels'] = ','.join(labels)

        try:

            merge_request = source_project.mergerequests.create(kwargs)

        except gitlab.GitlabCreateError as e:

            if e.response_code == 403:

                raise errors.PermissionDenied(e.error_message)

            if e.response_code == 409:

                raise MergeProposalExists(self.source_branch.user_url)

            raise

        return GitLabMergeProposal(merge_request)

def register_gitlab_instance(shortname, url):

    """Register a gitlab instance.

    :param shortname: Short name (e.g. "gitlab")

    :param url: URL to the gitlab instance

    """

    from breezy.bugtracker import (

        tracker_registry,

        ProjectIntegerBugTracker,

        )

    tracker_registry.register(

        shortname, ProjectIntegerBugTracker(

            shortname, url + '/{project}/issues/{id}'))