# phabricator.py - simple Phabricator integration

#

# Copyright 2017 Facebook, Inc.

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

"""simple Phabricator integration

Config::

    [phabricator]

    # Phabricator URL

    url = https://phab.example.com/

    # API token. Get it from https://$HOST/conduit/login/

    token = cli-xxxxxxxxxxxxxxxxxxxxxxxxxxxx

"""

from __future__ import absolute_import

import json

from mercurial.i18n import _

from mercurial import (

    error,

    registrar,

    url as urlmod,

    util,

)

cmdtable = {}

command = registrar.command(cmdtable)

def urlencodenested(params):

    """like urlencode, but works with nested parameters.

    For example, if params is {'a': ['b', 'c'], 'd': {'e': 'f'}}, it will be

    flattened to {'a[0]': 'b', 'a[1]': 'c', 'd[e]': 'f'} and then passed to

    urlencode. Note: the encoding is consistent with PHP's http_build_query.

    """

    flatparams = util.sortdict()

    def process(prefix, obj):

        items = {list: enumerate, dict: lambda x: x.items()}.get(type(obj))

        if items is None:

            flatparams[prefix] = obj

        else:

            for k, v in items(obj):

                if prefix:

                    process('%s[%s]' % (prefix, k), v)

                else:

                    process(k, v)

    process('', params)

    return util.urlreq.urlencode(flatparams)

def readurltoken(repo):

    """return conduit url, token and make sure they exist

    Currently read from [phabricator] config section. In the future, it might

    make sense to read from .arcconfig and .arcrc as well.

    """

    values = []

    section = 'phabricator'

    for name in ['url', 'token']:

        value = repo.ui.config(section, name)

        if not value:

            raise error.Abort(_('config %s.%s is required') % (section, name))

        values.append(value)

    return values

def callconduit(repo, name, params):

    """call Conduit API, params is a dict. return json.loads result, or None"""

    host, token = readurltoken(repo)

    url, authinfo = util.url('/'.join([host, 'api', name])).authinfo()

    urlopener = urlmod.opener(repo.ui, authinfo)

    repo.ui.debug('Conduit Call: %s %s\n' % (url, params))

    params = params.copy()

    params['api.token'] = token

    request = util.urlreq.request(url, data=urlencodenested(params))

    body = urlopener.open(request).read()

    repo.ui.debug('Conduit Response: %s\n' % body)

    parsed = json.loads(body)

    if parsed.get(r'error_code'):

        msg = (_('Conduit Error (%s): %s')

               % (parsed[r'error_code'], parsed[r'error_info']))

        raise error.Abort(msg)

    return parsed[r'result']

@command('debugcallconduit', [], _('METHOD'))

def debugcallconduit(ui, repo, name):

    """call Conduit API

    Call parameters are read from stdin as a JSON blob. Result will be written

    to stdout as a JSON blob.

    """

    params = json.loads(ui.fin.read())

    result = callconduit(repo, name, params)

    s = json.dumps(result, sort_keys=True, indent=2, separators=(',', ': '))

    ui.write('%s\n' % s)