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

# 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 3 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, see <http://www.gnu.org/licenses/>.

"""

vcs.backends.ssh

~~~~~~~~~~~~~~~~~

SSH backend for all available SCMs

"""

import sys

import logging

from kallithea.lib.auth import HasPermissionAnyMiddleware, AuthUser

from kallithea.lib.utils2 import safe_str, set_hook_environment

log = logging.getLogger(__name__)

class BaseSshHandler(object):

    # Protocol for setting properties:

    # Set by sub class:

    #   vcs_type: 'hg' or 'git'

    # Set by make() / __init__():

    #   repo_name: requested repo name - only validated by serve()

    # Set by serve() - must not be accessed before:

    #   db_repo: repository db object

    #   authuser: user that has been authenticated - like request.authuser ... which isn't used here

    #   allow_push: false for read-only access to the repo

    # Set defaults, in case .exit should be called early

    vcs_type = None

    repo_name = None

    @staticmethod

    def make(ssh_command):

        """Factory function. Given a command as invoked over SSH (and preserved

        in SSH_ORIGINAL_COMMAND when run as authorized_keys command), return a

        handler if the command looks ok, else return None.

        """

        raise NotImplementedError

    def serve(self, user_id, key_id, client_ip):

        """Verify basic sanity of the repository, and that the user is

        valid and has access - then serve the native VCS protocol for

        repository access."""

        dbuser = User.get(user_id)

        if dbuser is None:

            self.exit('User %r not found' % user_id)

        self.authuser = AuthUser.make(dbuser=dbuser, ip_addr=client_ip)

        log.info('Authorized user %s from SSH %s trusting user id %s and key id %s for %r', dbuser, client_ip, user_id, key_id, self.repo_name)

        if self.authuser is None: # not ok ... but already kind of authenticated by SSH ... but not really not authorized ...

            self.exit('User %s from %s cannot be authorized' % (dbuser.username, client_ip))

        if HasPermissionAnyMiddleware('repository.write',

                                      'repository.admin')(self.authuser, self.repo_name):

            self.allow_push = True

        elif HasPermissionAnyMiddleware('repository.read')(self.authuser, self.repo_name):

            self.allow_push = False

        else:

            self.exit('Access to %r denied' % safe_str(self.repo_name))

        self.db_repo = Repository.get_by_repo_name(self.repo_name)

        if self.db_repo is None:

            self.exit("Repository '%s' not found" % self.repo_name)

        assert self.db_repo.repo_name == self.repo_name

        # Set global hook environment up for 'push' actions.

        # If pull actions should be served, the actual hook invocation will be

        # hardcoded to 'pull' when log_pull_action is invoked (directly on Git,

        # or through the Mercurial 'outgoing' hook).

        # For push actions, the action in global hook environment is used (in

        # handle_git_post_receive when it is called as Git post-receive hook,

        # or in log_push_action through the Mercurial 'changegroup' hook).

        set_hook_environment(self.authuser.username, client_ip, self.repo_name, self.vcs_type, 'push')

        return self._serve()

    def _serve(self):

<table class="table">

    %if c.user_ssh_keys:

        <tr>

            <th>${_('Fingerprint')}</th>

            <th>${_('Description')}</th>

            <th>${_('Action')}</th>

        </tr>

        %for ssh_key in c.user_ssh_keys:

          <tr>

            <td>

                ${ssh_key.fingerprint}

            </td>

            <td>

                ${ssh_key.description}

            </td>

            <td>

                ${h.form(url('my_account_ssh_keys_delete'))}

                    ${h.hidden('del_public_key', ssh_key.public_key)}

                    <button class="btn btn-danger btn-xs" type="submit"

                            onclick="return confirm('${_('Confirm to remove this SSH key: %s') % ssh_key.fingerprint}');">

                        <i class="icon-trashcan"></i>

                        ${_('Remove')}

                    </button>

                ${h.end_form()}

            </td>

          </tr>

        %endfor

    %else:

        <tr>

            <td>

                <div class="ip">${_('No SSH keys have been added')}</div>

            </td>

        </tr>

    %endif

</table>

<div>

    ${h.form(url('my_account_ssh_keys'))}

    <div class="form">

            <div class="form-group">

<table class="table">

    %if c.user_ssh_keys:

        <tr>

            <th>${_('Fingerprint')}</th>

            <th>${_('Description')}</th>

            <th>${_('Action')}</th>

        </tr>

        %for ssh_key in c.user_ssh_keys:

          <tr>

            <td>

                ${ssh_key.fingerprint}

            </td>

            <td>

                ${ssh_key.description}

            </td>

            <td>

                ${h.form(url('edit_user_ssh_keys_delete', id=c.user.user_id))}

                    ${h.hidden('del_public_key', ssh_key.public_key)}

                    <button class="btn btn-danger btn-xs" type="submit"

                            onclick="return confirm('${_('Confirm to remove this SSH key: %s') % ssh_key.fingerprint}');">

                        <i class="icon-trashcan"></i>

                        ${_('Remove')}

                    </button>

                ${h.end_form()}

            </td>

          </tr>

        %endfor

    %else:

        <tr>

            <td>

                <div class="ip">${_('No SSH keys have been added')}</div>

            </td>

        </tr>

    %endif

</table>

<div>

    ${h.form(url('edit_user_ssh_keys', id=c.user.user_id))}

    <div class="form">

            <div class="form-group">