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

"""

 (c) 2014-2015 - Copyright Red Hat Inc

 Authors:

   Pierre-Yves Chibon <pingou@pingoured.fr></pingou@pingoured.fr>

"""

# These two lines are needed to run on EL6

__requires__ = ['SQLAlchemy >= 0.8', 'jinja2 >= 2.4']

import pkg_resources

__version__ = '0.0'

__api_version__ = '0'

import logging

import os

import subprocess

import urlparse

from logging.handlers import SMTPHandler

import flask

import pygit2

from flask_fas_openid import FAS

from functools import wraps

from sqlalchemy.exc import SQLAlchemyError

import progit.lib

import progit.mail_logging

import progit.doc_utils

import progit.login_forms

from pygments import highlight

from pygments.lexers.text import DiffLexer

from pygments.formatters import HtmlFormatter

# Create the application.

APP = flask.Flask(__name__)

APP.jinja_env.trim_blocks = True

APP.jinja_env.lstrip_blocks = True

# set up FAS

APP.config.from_object('progit.default_config')

if 'PROGIT_CONFIG' in os.environ:

    APP.config.from_envvar('PROGIT_CONFIG')

FAS = FAS(APP)

SESSION = progit.lib.create_session(APP.config['DB_URL'])

if not APP.debug:

    APP.logger.addHandler(progit.mail_logging.get_mail_handler(

        smtp_server=APP.config.get('SMTP_SERVER', '127.0.0.1'),

        mail_admin=APP.config.get('MAIL_ADMIN', APP.config['EMAIL_ERROR'])

    ))

# Send classic logs into syslog

handler = logging.StreamHandler()

handler.setLevel(APP.config.get('log_level', 'INFO'))

APP.logger.addHandler(handler)

LOG = APP.logger

def authenticated():

    return hasattr(flask.g, 'fas_user') and flask.g.fas_user

def is_safe_url(target):

    """ Checks that the target url is safe and sending to the current

    website not some other malicious one.

    """

    ref_url = urlparse.urlparse(flask.request.host_url)

    test_url = urlparse.urlparse(

        urlparse.urljoin(flask.request.host_url, target))

    return test_url.scheme in ('http', 'https') and \

        ref_url.netloc == test_url.netloc

def is_admin():

    """ Return whether the user is admin for this application or not. """

    if not authenticated():

        return False

    user = flask.g.fas_user

    auth_method = APP.config.get('PROGIT_AUTH', None)

    if auth_method == 'fas':

        if not user.cla_done or len(user.groups) < 1:

            return False

    admins = APP.config['ADMIN_GROUP']

    if isinstance(admins, basestring):

        admins = [admins]

    admins = set(admins)

    groups = set(flask.g.fas_user.groups)

    return not groups.isdisjoint(admins)

def is_repo_admin(repo_obj):

    """ Return whether the user is an admin of the provided repo. """

    if not authenticated():

        return False

    user = flask.g.fas_user.username

    return user == repo_obj.user.user or (

        user in [user.user for user in repo_obj.users])

def generate_gitolite_acls():

    """ Generate the gitolite configuration file for all repos

    """

    progit.lib.git.write_gitolite_acls(

        SESSION, APP.config['GITOLITE_CONFIG'])

    gitolite_folder = APP.config.get('GITOLITE_HOME', None)

    if gitolite_folder:

        cmd = 'GL_RC=%s GL_BINDIR=%s gl-compile-conf' % (

            APP.config.get('GL_RC'), APP.config.get('GL_BINDIR')

        )

        output = subprocess.Popen(

            cmd,

            shell=True,

            stdout=subprocess.PIPE,

            stderr=subprocess.PIPE,

            cwd=gitolite_folder

        )

def generate_gitolite_key(user, key):

    """ Generate the gitolite ssh key file for the specified user

    """

    gitolite_keydir = APP.config.get('GITOLITE_KEYDIR', None)

    if gitolite_keydir:

        keyfile = os.path.join(gitolite_keydir, '%s.pub' % user)

        with open(keyfile, 'w') as stream:

            stream.write(key + '\n')

def generate_authorized_key_file():

    """ Regenerate the `authorized_keys` file used by gitolite.

    """

    gitolite_home = APP.config.get('GITOLITE_HOME', None)

    if gitolite_home:

        users = progit.lib.search_user(SESSION)

        authorized_file = os.path.join(

            gitolite_home, '.ssh', 'authorized_keys')

        with open(authorized_file, 'w') as stream:

            stream.write('# gitolite start\n')

            for user in users:

                if not user.public_ssh_key:

                    continue

                row = 'command="/usr/bin/gl-auth-command %s",' \

                      'no-port-forwarding,no-X11-forwarding,'\

                      'no-agent-forwarding,no-pty %s' % (

                          user.user, user.public_ssh_key)

                stream.write(row + '\n')

            stream.write('# gitolite end\n')

def cla_required(function):

    """ Flask decorator to retrict access to CLA signed user.

To use this decorator you need to have a function named 'auth_login'.

Without that function the redirect if the user is not logged in will not

work.

"""

    auth_method = APP.config.get('PROGIT_AUTH', None)

    @wraps(function)

    def decorated_function(*args, **kwargs):

        """ Decorated function, actually does the work. """

        if not authenticated():

            return flask.redirect(

                flask.url_for('auth_login', next=flask.request.url))

        elif auth_method == 'fas' and not flask.g.fas_user.cla_done:

            flask.flash('You must sign the FPCA (Fedora Project Contributor '

                        'Agreement to use progit', 'errors')

            return flask.redirect(flask.url_for('.index'))

        return function(*args, **kwargs)

    return decorated_function

@APP.context_processor

def inject_variables():

    """ With this decorator we can set some variables to all templates.

    """

    user_admin = is_admin()

    return dict(

        version=__version__,

        admin=user_admin,

        authenticated=authenticated(),

    )

# pylint: disable=W0613

@APP.before_request

def set_session():

    """ Set the flask session as permanent. """

    flask.session.permanent = True

@FAS.postlogin

def set_user(return_url):

    ''' After login method. '''

    try:

        progit.lib.set_up_user(

            session=SESSION,

            username=flask.g.fas_user.username,

            fullname=flask.g.fas_user.fullname,

            user_email=flask.g.fas_user.email,

        )

        SESSION.commit()

    except SQLAlchemyError, err:

        SESSION.rollback()

        LOG.debug(err)

        LOG.exception(err)

        flask.flash(

            'Could not set up you as a user properly, please contact '

            'an admin', 'error')

    return flask.redirect(return_url)

@APP.errorhandler(404)

def not_found(error):

    """404 Not Found page"""

    return flask.render_template('not_found.html'), 404

@APP.errorhandler(500)

def fatal_error(error):

    """500 Fatal Error page"""

    return flask.render_template('fatal_error.html'), 500

@APP.errorhandler(401)

def unauthorized(error):

    """401 Unauthorized page"""

    return flask.render_template('unauthorized.html'), 401

@APP.route('/login/', methods=('GET', 'POST'))

def auth_login():

    """ Method to log into the application using FAS OpenID. """

    return_point = flask.url_for('index')

    if 'next' in flask.request.args:

        if is_safe_url(flask.request.args['next']):

            return_point = flask.request.args['next']

    if authenticated():

        return flask.redirect(return_point)

    admins = APP.config['ADMIN_GROUP']

    if isinstance(admins, basestring):

        admins = set([admins])

    else:  # pragma: no cover

        admins = set(admins)

    if APP.config.get('PROGIT_AUTH', None) == 'fas':

        return FAS.login(return_url=return_point, groups=admins)

    elif APP.config.get('PROGIT_AUTH', None) == 'local':

        form = progit.login_forms.LoginForm()

        return flask.render_template(

            'login/login.html',

            next_url=return_point,

            form=form,

        )

@APP.route('/logout/')

def auth_logout():

    """ Method to log out from the application. """

    return_point = flask.url_for('index')

    if 'next' in flask.request.args:

        if is_safe_url(flask.request.args['next']):

            return_point = flask.request.args['next']

    if not authenticated():

        return flask.redirect(return_point)

    if APP.config.get('PROGIT_AUTH', None) == 'fas':

        if hasattr(flask.g, 'fas_user') and flask.g.fas_user is not None:

            FAS.logout()

            flask.flash("You are no longer logged-in")

    elif APP.config.get('PROGIT_AUTH', None) == 'local':

        login.logout()

    return flask.redirect(return_point)

def __get_file_in_tree(repo_obj, tree, filepath):

    ''' Retrieve the entry corresponding to the provided filename in a

    given tree.

    '''

    filename = filepath[0]

    if isinstance(tree, pygit2.Blob):

        return

    for el in tree:

        if el.name == filename:

            if len(filepath) == 1:

                return repo_obj[el.oid]

            else:

                return __get_file_in_tree(

                    repo_obj, repo_obj[el.oid], filepath[1:])

def get_repo_path(repo):

    """ Return the pat of the git repository corresponding to the provided

    Repository object from the DB.

    """

    if repo.is_fork:

        repopath = os.path.join(APP.config['FORK_FOLDER'], repo.path)

    else:

        repopath = os.path.join(APP.config['GIT_FOLDER'], repo.path)

    if not os.path.exists(repopath):

        flask.abort(404, 'No git repo found')

    return repopath

# Import the application

import progit.ui.app

import progit.ui.admin

import progit.ui.docs

import progit.ui.fork

import progit.ui.issues

import progit.ui.plugins

import progit.ui.repo

import progit.api

APP.register_blueprint(progit.api.API)

# Only import the login controller if the app is set up for local login

if APP.config.get('PROGIT_AUTH', None) == 'local':

    import progit.ui.login as login

    APP.before_request(login._check_session_cookie)

    APP.after_request(login._send_session_cookie)