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# -*- coding: utf-8 -*-
'''
An engine that reads messages from Hipchat and sends them to the Salt
event bus.  Alternatively Salt commands can be sent to the Salt master
via Hipchat by setting the control parameter to ``True`` and using command
prefaced with a ``!``. Only token key is required, but room and control
keys make the engine interactive.

.. versionadded: 2016.11.0

:depends: hypchat
:configuration: Example configuration

    .. code-block:: yaml

        engines:
            - hipchat:
                api_url: http://api.hipchat.myteam.com
                token: 'XXXXXX'
                room: 'salt'
                control: True
                valid_users:
                    - SomeUser
                valid_commands:
                    - test.ping
                    - cmd.run
                    - list_jobs
                    - list_commands
                aliases:
                    list_jobs:
                        cmd: jobs.list_jobs
                    list_commands:
                        cmd: pillar.get salt:engines:hipchat:valid_commands target=saltmaster
                max_rooms: 0
                wait_time: 1
'''

from __future__ import absolute_import, print_function, unicode_literals
import logging
import time
import os


try:
    import hypchat
except ImportError:
    hypchat = None

import salt.utils.args
import salt.utils.event
import salt.utils.files
import salt.utils.http
import salt.utils.json
import salt.utils.stringutils
import salt.runner
import salt.client
import salt.loader
import salt.output
from salt.ext import six

log = logging.getLogger(__name__)

_DEFAULT_API_URL = 'https://api.hipchat.com'
_DEFAULT_SLEEP = 5
_DEFAULT_MAX_ROOMS = 1000

__virtualname__ = 'hipchat'


def __virtual__():
    return __virtualname__ if hypchat is not None \
        else (False, 'hypchat is not installed')


def _publish_file(token, room, filepath, message='', outputter=None, api_url=None):
    '''
    Send file to a HipChat room via API version 2

    Parameters
    ----------
    token : str
        HipChat API version 2 compatible token - must be token for active user
    room: str
        Name or API ID of the room to notify
    filepath: str
        Full path of file to be sent
    message: str, optional
        Message to send to room
    api_url: str, optional
        Hipchat API URL to use, defaults to http://api.hipchat.com
    '''

    if not os.path.isfile(filepath):
        raise ValueError("File '{0}' does not exist".format(filepath))
    if len(message) > 1000:
        raise ValueError('Message too long')

    url = "{0}/v2/room/{1}/share/file".format(api_url, room)
    headers = {'Content-type': 'multipart/related; boundary=boundary123456'}
    headers['Authorization'] = "Bearer " + token
    msg = salt.utils.json.dumps({'message': message})

    # future lint: disable=blacklisted-function
    with salt.utils.files.fopen(filepath, 'rb') as rfh:
        payload = str('''\
--boundary123456
Content-Type: application/json; charset=UTF-8
Content-Disposition: attachment; name="metadata"

{0}

--boundary123456
Content-Disposition: attachment; name="file"; filename="{1}"

{2}

--boundary123456--\
''').format(msg,
            os.path.basename(salt.utils.stringutils.to_str(filepath)),
            salt.utils.stringutils.to_str(rfh.read()))
    # future lint: enable=blacklisted-function

    salt.utils.http.query(url, method='POST', header_dict=headers, data=payload)


def _publish_html_message(token, room, data, message='', outputter='nested', api_url=None):
    '''
    Publishes the HTML-formatted message.
    '''
    url = "{0}/v2/room/{1}/notification".format(api_url, room)
    headers = {
        'Content-type': 'text/plain'
    }
    headers['Authorization'] = 'Bearer ' + token
    salt.utils.http.query(
        url,
        'POST',
        data=message,
        decode=True,
        status=True,
        header_dict=headers,
        opts=__opts__,
    )
    headers['Content-type'] = 'text/html'
    message = salt.output.html_format(data, outputter, opts=__opts__)
    salt.utils.http.query(
        url,
        'POST',
        data=message,
        decode=True,
        status=True,
        header_dict=headers,
        opts=__opts__,
    )


def _publish_code_message(token, room, data, message='', outputter='nested', api_url=None):
    '''
    Publishes the output format as code.
    '''
    url = "{0}/v2/room/{1}/notification".format(api_url, room)
    headers = {
        'Content-type': 'text/plain'
    }
    headers['Authorization'] = 'Bearer ' + token
    salt.utils.http.query(
        url,
        'POST',
        data=message,
        decode=True,
        status=True,
        header_dict=headers,
        opts=__opts__,
    )
    message = '/code '
    message += salt.output.string_format(data, outputter, opts=__opts__)
    salt.utils.http.query(
        url,
        'POST',
        data=message,
        decode=True,
        status=True,
        header_dict=headers,
        opts=__opts__,
    )


def start(token,
          room='salt',
          aliases=None,
          valid_users=None,
          valid_commands=None,
          control=False,
          trigger="!",
          tag='salt/engines/hipchat/incoming',
          api_key=None,
          api_url=None,
          max_rooms=None,
          wait_time=None,
          output_type='file',
          outputter='nested'):
    '''
    Listen to Hipchat messages and forward them to Salt.

    token
        The HipChat API key. It requires a key for global usgae,
        assigned per user, rather than room.

    room
        The HipChat room name.

    aliases
        Define custom aliases.

    valid_users
        Restrict access only to certain users.

    valid_commands
        Restrict the execution to a limited set of commands.

    control
        Send commands to the master.

    trigger: ``!``
        Special character that triggers the execution of salt commands.

    tag: ``salt/engines/hipchat/incoming``
        The event tag on the Salt bus.

    api_url: ``https://api.hipchat.com``
        The URL to the HipChat API.

        .. versionadded:: 2017.7.0

    max_rooms: ``1000``
        Maximum number of rooms allowed to fetch. If set to 0,
        it is able to retrieve the entire list of rooms.

    wait_time: ``5``
        Maximum wait time, in seconds.

    output_type: ``file``
        The type of the output. Choose bewteen:

            - ``file``: save the output into a temporary file and upload
            - ``html``: send the output as HTML
            - ``code``: send the output as code

        This can be overridden when executing a command, using the ``--out-type`` argument.

        .. versionadded:: 2017.7.0

    outputter: ``nested``
        The format to display the data, using the outputters available on the CLI.
        This argument can also be overridden when executing a command, using the ``--out`` option.

        .. versionadded:: 2017.7.0

    HipChat Example:

    .. code-block:: text

        ! test.ping
        ! test.ping target=minion1
        ! test.ping --out=nested
        ! test.ping --out-type=code --out=table
    '''
    target_room = None

    if __opts__.get('__role') == 'master':
        fire_master = salt.utils.event.get_master_event(
            __opts__,
            __opts__['sock_dir']).fire_event
    else:
        fire_master = None

    def fire(tag, msg):
        '''
        fire event to salt bus
        '''

        if fire_master:
            fire_master(msg, tag)
        else:
            __salt__['event.send'](tag, msg)

    def _eval_bot_mentions(all_messages, trigger):
        ''' yield partner message '''
        for message in all_messages:
            message_text = message['message']
            if message_text.startswith(trigger):
                fire(tag, message)
                text = message_text.replace(trigger, '').strip()
                yield message['from']['mention_name'], text

    token = token or api_key
    if not token:
        raise UserWarning("Hipchat token not found")

    runner_functions = sorted(salt.runner.Runner(__opts__).functions)

    if not api_url:
        api_url = _DEFAULT_API_URL
    hipc = hypchat.HypChat(token, endpoint=api_url)
    if not hipc:
        raise UserWarning("Unable to connect to hipchat")

    log.debug('Connected to Hipchat')
    rooms_kwargs = {}
    if max_rooms is None:
        max_rooms = _DEFAULT_MAX_ROOMS
        rooms_kwargs['max_results'] = max_rooms
    elif max_rooms > 0:
        rooms_kwargs['max_results'] = max_rooms
    # if max_rooms is 0 => retrieve all (rooms_kwargs is empty dict)
    all_rooms = hipc.rooms(**rooms_kwargs)['items']
    for a_room in all_rooms:
        if a_room['name'] == room:
            target_room = a_room
    if not target_room:
        log.debug("Unable to connect to room %s", room)
        # wait for a bit as to not burn through api calls
        time.sleep(30)
        raise UserWarning("Unable to connect to room {0}".format(room))

    after_message_id = target_room.latest(maxResults=1)['items'][0]['id']

    while True:
        try:
            new_messages = target_room.latest(
                not_before=after_message_id)['items']
        except hypchat.requests.HttpServiceUnavailable:
            time.sleep(15)
            continue

        after_message_id = new_messages[-1]['id']
        for partner, text in _eval_bot_mentions(new_messages[1:], trigger):
            # bot summoned by partner

            if not control:
                log.debug("Engine not configured for control")
                return

            # Ensure the user is allowed to run commands
            if valid_users:
                if partner not in valid_users:
                    target_room.message('{0} not authorized to run Salt commands'.format(partner))
                    return

            args = []
            kwargs = {}

            cmdline = salt.utils.args.shlex_split(text)
            cmd = cmdline[0]

            # Evaluate aliases
            if aliases and isinstance(aliases, dict) and cmd in aliases.keys():
                cmdline = aliases[cmd].get('cmd')
                cmdline = salt.utils.args.shlex_split(cmdline)
                cmd = cmdline[0]

            # Parse args and kwargs
            if len(cmdline) > 1:
                for item in cmdline[1:]:
                    if '=' in item:
                        (key, value) = item.split('=', 1)
                        kwargs[key] = value
                    else:
                        args.append(item)

            # Check for target. Otherwise assume *
            if 'target' not in kwargs:
                target = '*'
            else:
                target = kwargs['target']
                del kwargs['target']

            # Check for tgt_type. Otherwise assume glob
            if 'tgt_type' not in kwargs:
                tgt_type = 'glob'
            else:
                tgt_type = kwargs['tgt_type']
                del kwargs['tgt_type']

            # Check for outputter. Otherwise assume nested
            if '--out' in kwargs:
                outputter = kwargs['--out']
                del kwargs['--out']

            # Check for outputter. Otherwise assume nested
            if '--out-type' in kwargs:
                output_type = kwargs['--out-type']
                del kwargs['--out-type']

            # Ensure the command is allowed
            if valid_commands:
                if cmd not in valid_commands:
                    target_room.message('Using {0} is not allowed.'.format(cmd))
                    return

            ret = {}
            if cmd in runner_functions:
                runner = salt.runner.RunnerClient(__opts__)
                ret = runner.cmd(cmd, arg=args, kwarg=kwargs)

            # Default to trying to run as a client module.
            else:
                local = salt.client.LocalClient()
                ret = local.cmd('{0}'.format(target), cmd, args, kwargs, tgt_type='{0}'.format(tgt_type))

            nice_args = (' ' + ' '.join(args)) if args else ''
            nice_kwargs = (' ' + ' '.join('{0}={1}'.format(key, value) for (key, value) in six.iteritems(kwargs))) \
                          if kwargs else ''
            message_string = '@{0} Results for: {1}{2}{3} on {4}'.format(partner,
                                                                         cmd,
                                                                         nice_args,
                                                                         nice_kwargs,
                                                                         target)
            if output_type == 'html':
                _publish_html_message(token, room, ret, message=message_string, outputter=outputter, api_url=api_url)
            elif output_type == 'code':
                _publish_code_message(token, room, ret, message=message_string, outputter=outputter, api_url=api_url)
            else:
                tmp_path_fn = salt.utils.files.mkstemp()
                with salt.utils.files.fopen(tmp_path_fn, 'w+') as fp_:
                    salt.utils.json.dump(ret, fp_, sort_keys=True, indent=4)
                _publish_file(token, room, tmp_path_fn, message=message_string, api_url=api_url)
                salt.utils.files.safe_rm(tmp_path_fn)
        time.sleep(wait_time or _DEFAULT_SLEEP)

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