/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."""

import json

import os

import time

from ... import (

    bedding,

    branch as _mod_branch,

    controldir,

    errors,

    urlutils,

    )

from ...git.urls import git_url_to_bzr_url

from ...trace import mutter

from ...transport import get_transport

from ...propose import (

    determine_title,

    Hoster,

    MergeProposal,

    MergeProposalBuilder,

    MergeProposalExists,

    NoSuchProject,

    PrerequisiteBranchUnsupported,

    UnsupportedHoster,

    )

_DEFAULT_FILES = ['/etc/python-gitlab.cfg', '~/.python-gitlab.cfg']

DEFAULT_PAGE_SIZE = 50

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 NotMergeRequestUrl(errors.BzrError):

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

    def __init__(self, host, url):

        errors.BzrError.__init__(self)

        self.host = host

        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")

class GitlabLoginError(errors.BzrError):

    _fmt = ("Error logging in: %(error)s")

    def __init__(self, error):

        self.error = error

class GitLabConflict(errors.BzrError):

    _fmt = "Conflict during operation: %(reason)s"

    def __init__(self, reason):

        errors.BzrError(self, reason=reason)

class ForkingDisabled(errors.BzrError):

    _fmt = ("Forking on project %(project)s is disabled.")

    def __init__(self, project):

        self.project = project

class MergeRequestExists(Exception):

    """Raised when a merge requests already exists."""

def default_config_path():

    return os.path.join(bedding.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

    config = configparser.ConfigParser()

    config.read(

        [os.path.expanduser(p) for p in _DEFAULT_FILES] +

        [default_config_path()])

    for name, section in config.items():

        yield name, section

def get_credentials_by_url(url):

    for name, credentials in iter_tokens():

        if 'url' not in credentials:

            continue

        if credentials['url'].rstrip('/') == url.rstrip('/'):

            return credentials

    else:

        return None

def parse_gitlab_url(url):

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

        url)

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

        raise NotGitLabUrl(url)

    if not host:

        raise NotGitLabUrl(url)

    path = path.strip('/')

    if path.endswith('.git'):

        path = path[:-4]

    return host, path

def parse_gitlab_branch_url(branch):

    url = urlutils.strip_segment_parameters(branch.user_url)

    host, path = parse_gitlab_url(url)

    return host, path, branch.name

def parse_gitlab_merge_request_url(url):

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

        url)

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

        raise NotGitLabUrl(url)

    if not host:

        raise NotGitLabUrl(url)

    path = path.strip('/')

    parts = path.split('/')

    if len(parts) < 2:

        raise NotMergeRequestUrl(host, url)

    if parts[-2] != 'merge_requests':

        raise NotMergeRequestUrl(host, url)

    if parts[-3] == '-':

        project_name = '/'.join(parts[:-3])

    else:

        project_name = '/'.join(parts[:-2])

    return host, project_name, int(parts[-1])

class GitLabMergeProposal(MergeProposal):

    def __init__(self, gl, mr):

        self.gl = gl

        self._mr = mr

    def _update(self, **kwargs):

        self.gl._update_merge_request(self._mr['project_id'], self._mr['iid'], kwargs)

    def __repr__(self):

        return "<%s at %r>" % (type(self).__name__, self._mr['web_url'])

    @property

    def url(self):

        return self._mr['web_url']

    def get_description(self):

        return self._mr['description']

    def set_description(self, description):

        self._update(description=description, title=determine_title(description))

    def get_commit_message(self):

        return self._mr.get('merge_commit_message')

    def set_commit_message(self, message):

        raise errors.UnsupportedOperation(self.set_commit_message, self)

    def _branch_url_from_project(self, project_id, branch_name):

        if project_id is None:

            return None

        project = self.gl._get_project(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_source_revision(self):

        from breezy.git.mapping import default_mapping

        sha = self._mr['sha']

        if sha is None:

            return None

        return default_mapping.revision_id_foreign_to_bzr(sha.encode('ascii'))

    def get_target_branch_url(self):

        return self._branch_url_from_project(

            self._mr['target_project_id'], self._mr['target_branch'])

    def _get_project_name(self, project_id):

        source_project = self.gl._get_project(project_id)

        return source_project['path_with_namespace']

    def get_source_project(self):

        return self._get_project_name(self._mr['source_project_id'])

    def get_target_project(self):

        return self._get_project_name(self._mr['target_project_id'])

    def is_merged(self):

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

    def is_closed(self):

        return (self._mr['state'] == 'closed')

    def reopen(self):

        return self._update(state_event='reopen')

    def close(self):

        self._update(state_event='close')

    def merge(self, commit_message=None):

        # https://docs.gitlab.com/ee/api/merge_requests.html#accept-mr

        self._mr.merge(merge_commit_message=commit_message)

    def can_be_merged(self):

        if self._mr['merge_status'] == 'cannot_be_merged':

            return False

        elif self._mr['merge_status'] == 'can_be_merged':

            return True

        elif self._mr['merge_status'] in (

                'unchecked', 'cannot_be_merged_recheck'):

            # See https://gitlab.com/gitlab-org/gitlab/-/commit/7517105303c for

            # an explanation of the distinction between unchecked and

            # cannot_be_merged_recheck

            return None

        else:

            raise ValueError(self._mr['merge_status'])

    def get_merged_by(self):

        user = self._mr.get('merged_by')

        if user is None:

            return None

        return user['username']

    def get_merged_at(self):

        merged_at = self._mr.get('merged_at')

        if merged_at is None:

            return None

        import iso8601

        return iso8601.parse_date(merged_at)

    def post_comment(self, body):

        kwargs = {'body': body}

        self.gl._post_merge_request_note(

            self._mr['project_id'], self._mr['iid'], kwargs)

def gitlab_url_to_bzr_url(url, name):

    return git_url_to_bzr_url(url, branch=name)

class GitLab(Hoster):

    """GitLab hoster implementation."""

    supports_merge_proposal_labels = True

    supports_merge_proposal_commit_message = False

    supports_allow_collaboration = True

    merge_proposal_description_format = 'markdown'

    def __repr__(self):

        return "<GitLab(%r)>" % self.base_url

    @property

    def base_url(self):

        return self.transport.base

    @property

    def base_hostname(self):

        return urlutils.parse_url(self.base_url)[3]

    def _api_request(self, method, path, fields=None, body=None):

        return self.transport.request(

            method, urlutils.join(self.base_url, 'api', 'v4', path),

            headers=self.headers, fields=fields, body=body)

    def __init__(self, transport, private_token):

        self.transport = transport

        self.headers = {"Private-Token": private_token}

        self.check()

    def _get_user(self, username):

        path = 'users/%s' % urlutils.quote(str(username), '')

        response = self._api_request('GET', path)

        if response.status == 404:

            raise KeyError('no such user %s' % username)

        if response.status == 200:

            return json.loads(response.data)

        raise errors.UnexpectedHttpStatus(path, response.status)

    def _get_user_by_email(self, email):

        path = 'users?search=%s' % urlutils.quote(str(email), '')

        response = self._api_request('GET', path)

        if response.status == 404:

            raise KeyError('no such user %s' % email)

        if response.status == 200:

            ret = json.loads(response.data)

            if len(ret) != 1:

                raise ValueError('unexpected number of results; %r' % ret)

            return ret[0]

        raise errors.UnexpectedHttpStatus(path, response.status)

    def _get_project(self, project_name):

        path = 'projects/%s' % urlutils.quote(str(project_name), '')

        response = self._api_request('GET', path)

        if response.status == 404:

            raise NoSuchProject(project_name)

        if response.status == 200:

            return json.loads(response.data)

        raise errors.UnexpectedHttpStatus(path, response.status)

    def _fork_project(self, project_name, timeout=50, interval=5, owner=None):

        path = 'projects/%s/fork' % urlutils.quote(str(project_name), '')

        fields = {}

        if owner is not None:

            fields['namespace'] = owner

        response = self._api_request('POST', path, fields=fields)

        if response.status == 404:

            raise ForkingDisabled(project_name)

        if response.status == 409:

            resp = json.loads(response.data)

            raise GitLabConflict(resp.get('message'))

        if response.status not in (200, 201):

            raise errors.UnexpectedHttpStatus(path, response.status)

        # The response should be valid JSON, but let's ignore it

        project = json.loads(response.data)

        # Spin and wait until import_status for new project

        # is complete.

        deadline = time.time() + timeout

        while project['import_status'] not in ('finished', 'none'):

            mutter('import status is %s', project['import_status'])

            if time.time() > deadline:

                raise Exception('timeout waiting for project to become available')

            time.sleep(interval)

            project = self._get_project(project['path_with_namespace'])

        return project

    def get_current_user(self):

        return self._current_user['username']

    def get_user_url(self, username):

        return urlutils.join(self.base_url, username)

    def _list_paged(self, path, parameters=None, per_page=None):

        if parameters is None:

            parameters = {}

        else:

            parameters = dict(parameters.items())

        if per_page:

            parameters['per_page'] = str(per_page)

        page = "1"

        while page:

            parameters['page'] = page

            response = self._api_request(

                'GET', path + '?' +

                ';'.join(['%s=%s' % item for item in parameters.items()]))

            if response.status == 403:

                raise errors.PermissionDenied(response.text)

            if response.status != 200:

                raise errors.UnexpectedHttpStatus(path, response.status)

            page = response.getheader("X-Next-Page")

            for entry in json.loads(response.data):

                yield entry

    def _list_merge_requests(self, owner=None, project=None, state=None):

        if project is not None:

            path = 'projects/%s/merge_requests' % urlutils.quote(str(project), '')

        else:

            path = 'merge_requests'

        parameters = {}

        if state:

            parameters['state'] = state

        if owner:

            parameters['owner_id'] = urlutils.quote(owner, '')

        return self._list_paged(path, parameters, per_page=DEFAULT_PAGE_SIZE)

    def _get_merge_request(self, project, merge_id):

        path = 'projects/%s/merge_requests/%d' % (urlutils.quote(str(project), ''), merge_id)

        response = self._api_request('GET', path)

        if response.status == 403:

            raise errors.PermissionDenied(response.text)

        if response.status != 200:

            raise errors.UnexpectedHttpStatus(path, response.status)

        return json.loads(response.data)

    def _list_projects(self, owner):

        path = 'users/%s/projects' % urlutils.quote(str(owner), '')

        parameters = {}

        return self._list_paged(path, parameters, per_page=DEFAULT_PAGE_SIZE)

    def _update_merge_request(self, project_id, iid, mr):

        path = 'projects/%s/merge_requests/%s' % (

            urlutils.quote(str(project_id), ''), iid)

        response = self._api_request('PUT', path, fields=mr)

        if response.status == 200:

            return json.loads(response.data)

        raise errors.UnexpectedHttpStatus(path, response.status)

    def _post_merge_request_note(self, project_id, iid, kwargs):

        path = 'projects/%s/merge_requests/%s/notes' % (

            urlutils.quote(str(project_id), ''), iid)

        response = self._api_request('POST', path, fields=kwargs)

        if response.status == 201:

            json.loads(response.data)

            return

        raise errors.UnexpectedHttpStatus(path, response.status)

    def _create_mergerequest(

            self, title, source_project_id, target_project_id,

            source_branch_name, target_branch_name, description,

            labels=None, allow_collaboration=False):

        path = 'projects/%s/merge_requests' % source_project_id

        fields = {

            'title': title,

            'source_branch': source_branch_name,

            'target_branch': target_branch_name,

            'target_project_id': target_project_id,

            'description': description,

            'allow_collaboration': allow_collaboration,

            }

        if labels:

            fields['labels'] = labels

        response = self._api_request('POST', path, fields=fields)

        if response.status == 403:

            raise errors.PermissionDenied(response.text)

        if response.status == 409:

            raise MergeRequestExists()

        if response.status != 201:

            raise errors.UnexpectedHttpStatus(path, response.status)

        return json.loads(response.data)

    def get_push_url(self, branch):

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

        project = self._get_project(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, tag_selector=None):

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

        if owner is None:

            owner = self.get_current_user()

        if project is None:

            project = self._get_project(base_project)['path']

        try:

            target_project = self._get_project('%s/%s' % (owner, project))

        except NoSuchProject:

            target_project = self._fork_project(base_project, owner=owner)

        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, tag_selector=tag_selector)

        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, tag_selector=tag_selector)

        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):

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

        if owner is None:

            owner = self.get_current_user()

        if project is None:

            project = self._get_project(base_project)['path']

        try:

            target_project = self._get_project('%s/%s' % (owner, project))

        except NoSuchProject:

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

        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, source_branch, target_branch)

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

        (source_host, source_project_name, source_branch_name) = (

            parse_gitlab_branch_url(source_branch))

        (target_host, target_project_name, target_branch_name) = (

            parse_gitlab_branch_url(target_branch))

        if source_host != target_host:

            raise DifferentGitLabInstances(source_host, target_host)

        source_project = self._get_project(source_project_name)

        target_project = self._get_project(target_project_name)

        state = mp_status_to_status(status)

        for mr in self._list_merge_requests(

                project=target_project['id'], 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(self, mr)

    def hosts(self, branch):

        try:

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

        except NotGitLabUrl:

            return False

        return self.base_hostname == host

    def check(self):

        response = self._api_request('GET', 'user')

        if response.status == 200:

            self._current_user = json.loads(response.data)

            return

        if response == 401:

            if json.loads(response.data) == {"message": "401 Unauthorized"}:

                raise GitLabLoginMissing()

            else:

                raise GitlabLoginError(response.text)