Synnefo

# Copyright 2011, 2012, 2013 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import logging

import socket

from django.utils.translation import ugettext as _

from django.template.loader import render_to_string

from django.core.mail import send_mail, get_connection

from django.core.urlresolvers import reverse

from django.template import Context, loader

from django.contrib.auth import (

    login as auth_login,

    logout as auth_logout)

from django.contrib.auth.models import AnonymousUser

from django.core.exceptions import PermissionDenied

from django.db import IntegrityError

from django.http import Http404

from urllib import quote

from smtplib import SMTPException

from datetime import datetime

from functools import wraps

from synnefo.lib import join_urls

from astakos.im.settings import (

    CONTACT_EMAIL, SITENAME, BASEURL, LOGGING_LEVEL,

    VERIFICATION_EMAIL_SUBJECT, ACCOUNT_CREATION_SUBJECT,

    GROUP_CREATION_SUBJECT, HELPDESK_NOTIFICATION_EMAIL_SUBJECT,

    INVITATION_EMAIL_SUBJECT, GREETING_EMAIL_SUBJECT, FEEDBACK_EMAIL_SUBJECT,

    EMAIL_CHANGE_EMAIL_SUBJECT,

    PROJECT_CREATION_SUBJECT, PROJECT_APPROVED_SUBJECT,

    PROJECT_TERMINATION_SUBJECT, PROJECT_SUSPENSION_SUBJECT,

    PROJECT_MEMBERSHIP_CHANGE_SUBJECT)

from astakos.im.notifications import build_notification, NotificationError

from astakos.im.models import (

    AstakosUser, Invitation, ProjectMembership, ProjectApplication, Project,

    UserSetting,

    get_resource_names, new_chain)

from astakos.im.quotas import (qh_sync_user, qh_sync_users,

                               register_pending_apps, qh_sync_project)

from astakos.im.project_notif import (

    membership_change_notify, membership_enroll_notify,

    membership_request_notify, membership_leave_request_notify,

    application_submit_notify, application_approve_notify,

    application_deny_notify,

    project_termination_notify, project_suspension_notify)

from astakos.im import settings

import astakos.im.messages as astakos_messages

logger = logging.getLogger(__name__)

def login(request, user):

    auth_login(request, user)

    from astakos.im.models import SessionCatalog

    SessionCatalog(

        session_key=request.session.session_key,

        user=user

    ).save()

    logger.info('%s logged in.', user.log_display)

def logout(request, *args, **kwargs):

    user = request.user

    auth_logout(request, *args, **kwargs)

    logger.info('%s logged out.', user.log_display)

def send_verification(user, template_name='im/activation_email.txt'):

    """

    Send email to user to verify his/her email and activate his/her account.

    """

    url = join_urls(BASEURL, user.get_activation_url(nxt=reverse('index')))

    message = render_to_string(template_name, {

                               'user': user,

                               'url': url,

                               'baseurl': BASEURL,

                               'site_name': SITENAME,

                               'support': CONTACT_EMAIL})

    sender = settings.SERVER_EMAIL

    send_mail(_(VERIFICATION_EMAIL_SUBJECT), message, sender, [user.email],

              connection=get_connection())

    logger.info("Sent user verirfication email: %s", user.log_display)

def _send_admin_notification(template_name,

                             context=None,

                             user=None,

                             msg="",

                             subject='alpha2 testing notification',):

    """

    Send notification email to settings.HELPDESK + settings.MANAGERS +

    settings.ADMINS.

    """

    if context is None:

        context = {}

    if not 'user' in context:

        context['user'] = user

    message = render_to_string(template_name, context)

    sender = settings.SERVER_EMAIL

    recipient_list = [e[1] for e in settings.HELPDESK +

                      settings.MANAGERS + settings.ADMINS]

    send_mail(subject, message, sender, recipient_list,

              connection=get_connection())

    if user:

        msg = 'Sent admin notification (%s) for user %s' % (msg,

                                                            user.log_display)

    else:

        msg = 'Sent admin notification (%s)' % msg

    logger.log(LOGGING_LEVEL, msg)

def send_account_pending_moderation_notification(

        user,

        template_name='im/account_pending_moderation_notification.txt'):

    """

    Notify admins that a new user has verified his email address and moderation

    step is required to activate his account.

    """

    subject = _(ACCOUNT_CREATION_SUBJECT) % {'user': user.email}

    return _send_admin_notification(template_name, {}, subject=subject,

                                    user=user, msg="account creation")

def send_account_activated_notification(

        user,

        template_name='im/account_activated_notification.txt'):

    """

    Send email to settings.HELPDESK + settings.MANAGERES + settings.ADMINS

    lists to notify that a new account has been accepted and activated.

    """

    message = render_to_string(

        template_name,

        {'user': user}

    )

    sender = settings.SERVER_EMAIL

    recipient_list = [e[1] for e in settings.HELPDESK +

                      settings.MANAGERS + settings.ADMINS]

    send_mail(_(HELPDESK_NOTIFICATION_EMAIL_SUBJECT) % {'user': user.email},

              message, sender, recipient_list, connection=get_connection())

    msg = 'Sent helpdesk admin notification for %s' % user.email

    logger.log(LOGGING_LEVEL, msg)

def send_invitation(invitation, template_name='im/invitation.txt'):

    """

    Send invitation email.

    """

    subject = _(INVITATION_EMAIL_SUBJECT)

    url = '%s?code=%d' % (join_urls(BASEURL, reverse('index')), invitation.code)

    message = render_to_string(template_name, {

                               'invitation': invitation,

                               'url': url,

                               'baseurl': BASEURL,

                               'site_name': SITENAME,

                               'support': CONTACT_EMAIL})

    sender = settings.SERVER_EMAIL

    send_mail(subject, message, sender, [invitation.username],

              connection=get_connection())

    msg = 'Sent invitation %s' % invitation

    logger.log(LOGGING_LEVEL, msg)

    inviter_invitations = invitation.inviter.invitations

    invitation.inviter.invitations = max(0, inviter_invitations - 1)

    invitation.inviter.save()

def send_greeting(user, email_template_name='im/welcome_email.txt'):

    """

    Send welcome email to an accepted/activated user.

    Raises SMTPException, socket.error

    """

    subject = _(GREETING_EMAIL_SUBJECT)

    message = render_to_string(email_template_name, {

                               'user': user,

                               'url': join_urls(BASEURL, reverse('index')),

                               'baseurl': BASEURL,

                               'site_name': SITENAME,

                               'support': CONTACT_EMAIL})

    sender = settings.SERVER_EMAIL

    send_mail(subject, message, sender, [user.email],

              connection=get_connection())

    msg = 'Sent greeting %s' % user.log_display

    logger.log(LOGGING_LEVEL, msg)

def send_feedback(msg, data, user, email_template_name='im/feedback_mail.txt'):

    subject = _(FEEDBACK_EMAIL_SUBJECT)

    from_email = settings.SERVER_EMAIL

    recipient_list = [e[1] for e in settings.HELPDESK]

    content = render_to_string(email_template_name, {

        'message': msg,

        'data': data,

        'user': user})

    try:

        send_mail(subject, content, from_email, recipient_list,

                  connection=get_connection())

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendFeedbackError()

    else:

        msg = 'Sent feedback from %s' % user.log_display

        logger.log(LOGGING_LEVEL, msg)

def send_change_email(

    ec, request, email_template_name='registration/email_change_email.txt'):

    try:

        url = ec.get_url()

        url = request.build_absolute_uri(url)

        t = loader.get_template(email_template_name)

        c = {'url': url, 'site_name': SITENAME,

             'support': CONTACT_EMAIL, 'ec': ec}

        from_email = settings.SERVER_EMAIL

        send_mail(_(EMAIL_CHANGE_EMAIL_SUBJECT), t.render(Context(c)),

                  from_email, [ec.new_email_address],

                  connection=get_connection())

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise ChangeEmailError()

    else:

        msg = 'Sent change email for %s' % ec.user.log_display

        logger.log(LOGGING_LEVEL, msg)

def invite(inviter, email, realname):

    inv = Invitation(inviter=inviter, username=email, realname=realname)

    inv.save()

    send_invitation(inv)

    inviter.invitations = max(0, inviter.invitations - 1)

    inviter.save()

### PROJECT FUNCTIONS ###

AUTO_ACCEPT_POLICY = 1

MODERATED_POLICY = 2

CLOSED_POLICY = 3

POLICIES = [AUTO_ACCEPT_POLICY, MODERATED_POLICY, CLOSED_POLICY]

def get_project_by_application_id(project_application_id):

    try:

        return Project.objects.get(application__id=project_application_id)

    except Project.DoesNotExist:

        m = (_(astakos_messages.UNKNOWN_PROJECT_APPLICATION_ID) %

             project_application_id)

        raise IOError(m)

def get_related_project_id(application_id):

    try:

        app = ProjectApplication.objects.get(id=application_id)

        chain = app.chain

        Project.objects.get(id=chain)

        return chain

    except (ProjectApplication.DoesNotExist, Project.DoesNotExist):

        return None

def get_chain_of_application_id(application_id):

    try:

        app = ProjectApplication.objects.get(id=application_id)

        chain = app.chain

        return chain.chain

    except ProjectApplication.DoesNotExist:

        return None

def get_project_by_id(project_id):

    try:

        return Project.objects.get(id=project_id)

    except Project.DoesNotExist:

        m = _(astakos_messages.UNKNOWN_PROJECT_ID) % project_id

        raise IOError(m)

def get_project_by_name(name):

    try:

        return Project.objects.get(name=name)

    except Project.DoesNotExist:

        m = _(astakos_messages.UNKNOWN_PROJECT_ID) % name

        raise IOError(m)

def get_project_for_update(project_id):

    try:

        return Project.objects.get_for_update(id=project_id)

    except Project.DoesNotExist:

        m = _(astakos_messages.UNKNOWN_PROJECT_ID) % project_id

        raise IOError(m)

def get_application_for_update(application_id):

    try:

        return ProjectApplication.objects.get_for_update(id=application_id)

    except ProjectApplication.DoesNotExist:

        m = _(astakos_messages.UNKNOWN_PROJECT_APPLICATION_ID) % application_id

        raise IOError(m)

def get_user_by_id(user_id):

    try:

        return AstakosUser.objects.get(id=user_id)

    except AstakosUser.DoesNotExist:

        m = _(astakos_messages.UNKNOWN_USER_ID) % user_id

        raise IOError(m)

def get_user_by_uuid(uuid):

    try:

        return AstakosUser.objects.get(uuid=uuid)

    except AstakosUser.DoesNotExist:

        m = _(astakos_messages.UNKNOWN_USER_ID) % uuid

        raise IOError(m)

def get_membership_for_update(project_id, user_id):

    try:

        objs = ProjectMembership.objects

        return objs.get_for_update(project__id=project_id,

                                   person__id=user_id)

    except ProjectMembership.DoesNotExist:

        m = _(astakos_messages.NOT_MEMBERSHIP_REQUEST)

        raise IOError(m)

def get_membership_for_update_by_id(project_id, memb_id):

    try:

        objs = ProjectMembership.objects

        return objs.get_for_update(project__id=project_id,

                                   id=memb_id)

    except ProjectMembership.DoesNotExist:

        m = _(astakos_messages.NOT_MEMBERSHIP_REQUEST)

        raise IOError(m)

def checkAllowed(entity, request_user, admin_only=False):

    if isinstance(entity, Project):

        application = entity.application

    elif isinstance(entity, ProjectApplication):

        application = entity

    else:

        m = "%s not a Project nor a ProjectApplication" % (entity,)

        raise ValueError(m)

    if not request_user or request_user.is_project_admin():

        return

    if not admin_only and application.owner == request_user:

        return

    m = _(astakos_messages.NOT_ALLOWED)

    raise PermissionDenied(m)

def checkAlive(project):

    if not project.is_alive:

        m = _(astakos_messages.NOT_ALIVE_PROJECT) % project.__dict__

        raise PermissionDenied(m)

def accept_membership_checks(project, request_user):

    checkAllowed(project, request_user)

    checkAlive(project)

    join_policy = project.application.member_join_policy

    if join_policy == CLOSED_POLICY:

        m = _(astakos_messages.MEMBER_JOIN_POLICY_CLOSED)

        raise PermissionDenied(m)

    if project.violates_members_limit(adding=1):

        m = _(astakos_messages.MEMBER_NUMBER_LIMIT_REACHED)

        raise PermissionDenied(m)

def accept_membership(project_id, memb_id, request_user=None):

    project = get_project_for_update(project_id)

    accept_membership_checks(project, request_user)

    membership = get_membership_for_update_by_id(project_id, memb_id)

    if not membership.can_accept():

        m = _(astakos_messages.NOT_MEMBERSHIP_REQUEST)

        raise PermissionDenied(m)

    user = membership.person

    membership.accept()

    qh_sync_user(user)

    logger.info("User %s has been accepted in %s." %

                (user.log_display, project))

    membership_change_notify(project, user, 'accepted')

    return membership

def reject_membership_checks(project, request_user):

    checkAllowed(project, request_user)

    checkAlive(project)

def reject_membership(project_id, memb_id, request_user=None):

    project = get_project_for_update(project_id)

    reject_membership_checks(project, request_user)

    membership = get_membership_for_update_by_id(project_id, memb_id)

    if not membership.can_reject():

        m = _(astakos_messages.NOT_MEMBERSHIP_REQUEST)

        raise PermissionDenied(m)

    user = membership.person

    membership.reject()

    logger.info("Request of user %s for %s has been rejected." %

                (user.log_display, project))

    membership_change_notify(project, user, 'rejected')

    return membership

def cancel_membership_checks(project):

    checkAlive(project)

def cancel_membership(project_id, request_user):

    project = get_project_for_update(project_id)

    cancel_membership_checks(project)

    membership = get_membership_for_update(project_id, request_user.id)

    if not membership.can_cancel():

        m = _(astakos_messages.NOT_MEMBERSHIP_REQUEST)

        raise PermissionDenied(m)

    membership.cancel()

    logger.info("Request of user %s for %s has been cancelled." %

                (membership.person.log_display, project))

def remove_membership_checks(project, request_user=None):

    checkAllowed(project, request_user)

    checkAlive(project)

    leave_policy = project.application.member_leave_policy

    if leave_policy == CLOSED_POLICY:

        m = _(astakos_messages.MEMBER_LEAVE_POLICY_CLOSED)

        raise PermissionDenied(m)

def remove_membership(project_id, memb_id, request_user=None):

    project = get_project_for_update(project_id)

    remove_membership_checks(project, request_user)

    membership = get_membership_for_update_by_id(project_id, memb_id)

    if not membership.can_remove():

        m = _(astakos_messages.NOT_ACCEPTED_MEMBERSHIP)

        raise PermissionDenied(m)

    user = membership.person

    membership.remove()

    qh_sync_user(user)

    logger.info("User %s has been removed from %s." %

                (user.log_display, project))

    membership_change_notify(project, user, 'removed')

    return membership

def enroll_member(project_id, user, request_user=None):

    project = get_project_for_update(project_id)

    accept_membership_checks(project, request_user)

    membership, created = ProjectMembership.objects.get_or_create(

        project=project,

        person=user)

    if not membership.can_accept():

        m = _(astakos_messages.NOT_MEMBERSHIP_REQUEST)

        raise PermissionDenied(m)

    membership.accept()

    qh_sync_user(user)

    logger.info("User %s has been enrolled in %s." %

                (membership.person.log_display, project))

    membership_enroll_notify(project, membership.person)

    return membership

def leave_project_checks(project):

    checkAlive(project)

    leave_policy = project.application.member_leave_policy

    if leave_policy == CLOSED_POLICY:

        m = _(astakos_messages.MEMBER_LEAVE_POLICY_CLOSED)

        raise PermissionDenied(m)

def can_leave_request(project, user):

    leave_policy = project.application.member_leave_policy

    if leave_policy == CLOSED_POLICY:

        return False

    m = user.get_membership(project)

    if m is None:

        return False

    if m.state != ProjectMembership.ACCEPTED:

        return False

    return True

def leave_project(project_id, request_user):

    project = get_project_for_update(project_id)

    leave_project_checks(project)

    membership = get_membership_for_update(project_id, request_user.id)

    if not membership.can_leave():

        m = _(astakos_messages.NOT_ACCEPTED_MEMBERSHIP)

        raise PermissionDenied(m)

    auto_accepted = False

    leave_policy = project.application.member_leave_policy

    if leave_policy == AUTO_ACCEPT_POLICY:

        membership.remove()

        qh_sync_user(request_user)

        logger.info("User %s has left %s." %

                    (membership.person.log_display, project))

        auto_accepted = True

    else:

        membership.leave_request()

        logger.info("User %s requested to leave %s." %

                    (membership.person.log_display, project))

        membership_leave_request_notify(project, membership.person)

    return auto_accepted

def join_project_checks(project):

    checkAlive(project)

    join_policy = project.application.member_join_policy

    if join_policy == CLOSED_POLICY:

        m = _(astakos_messages.MEMBER_JOIN_POLICY_CLOSED)

        raise PermissionDenied(m)

def can_join_request(project, user):

    join_policy = project.application.member_join_policy

    if join_policy == CLOSED_POLICY:

        return False

    m = user.get_membership(project)

    if m:

        return False

    return True

def join_project(project_id, request_user):

    project = get_project_for_update(project_id)

    join_project_checks(project)

    membership, created = ProjectMembership.objects.get_or_create(

        project=project,

        person=request_user)

    if not created:

        msg = _(astakos_messages.MEMBERSHIP_REQUEST_EXISTS)

        raise PermissionDenied(msg)

    auto_accepted = False

    join_policy = project.application.member_join_policy

    if (join_policy == AUTO_ACCEPT_POLICY and (

            not project.violates_members_limit(adding=1))):

        membership.accept()

        qh_sync_user(request_user)

        logger.info("User %s joined %s." %

                    (membership.person.log_display, project))

        auto_accepted = True

    else:

        membership_request_notify(project, membership.person)

        logger.info("User %s requested to join %s." %

                    (membership.person.log_display, project))

    return auto_accepted

def submit_application(owner=None,

                       name=None,

                       precursor_id=None,

                       homepage=None,

                       description=None,

                       start_date=None,

                       end_date=None,

                       member_join_policy=None,

                       member_leave_policy=None,

                       limit_on_members_number=None,

                       comments=None,

                       resource_policies=None,

                       request_user=None):

    precursor = None

    if precursor_id is not None:

        objs = ProjectApplication.objects

        precursor = objs.get_for_update(id=precursor_id)

        if (request_user and

            (not precursor.owner == request_user and

             not request_user.is_superuser

             and not request_user.is_project_admin())):

            m = _(astakos_messages.NOT_ALLOWED)

            raise PermissionDenied(m)

    force = request_user.is_project_admin()

    ok, limit = qh_add_pending_app(owner, precursor, force)

    if not ok:

        m = _(astakos_messages.REACHED_PENDING_APPLICATION_LIMIT) % limit

        raise PermissionDenied(m)

    application = ProjectApplication(

        applicant=request_user,

        owner=owner,

        name=name,

        precursor_application_id=precursor_id,

        homepage=homepage,

        description=description,

        start_date=start_date,

        end_date=end_date,

        member_join_policy=member_join_policy,

        member_leave_policy=member_leave_policy,

        limit_on_members_number=limit_on_members_number,

        comments=comments)

    if precursor is None:

        application.chain = new_chain()

    else:

        chain = precursor.chain

        application.chain = chain

        objs = ProjectApplication.objects

        q = objs.filter(chain=chain, state=ProjectApplication.PENDING)

        pending = q.select_for_update()

        for app in pending:

            app.state = ProjectApplication.REPLACED

            app.save()

    application.save()

    application.set_resource_policies(resource_policies)

    logger.info("User %s submitted %s." %

                (request_user.log_display, application.log_display))

    application_submit_notify(application)

    return application

def cancel_application(application_id, request_user=None, reason=""):

    application = get_application_for_update(application_id)

    checkAllowed(application, request_user)

    if not application.can_cancel():

        m = _(astakos_messages.APPLICATION_CANNOT_CANCEL %

              (application.id, application.state_display()))

        raise PermissionDenied(m)

    qh_release_pending_app(application.owner)

    application.cancel()

    logger.info("%s has been cancelled." % (application.log_display))

def dismiss_application(application_id, request_user=None, reason=""):

    application = get_application_for_update(application_id)

    checkAllowed(application, request_user)

    if not application.can_dismiss():

        m = _(astakos_messages.APPLICATION_CANNOT_DISMISS %

              (application.id, application.state_display()))

        raise PermissionDenied(m)

    application.dismiss()

    logger.info("%s has been dismissed." % (application.log_display))

def deny_application(application_id, request_user=None, reason=""):

    application = get_application_for_update(application_id)

    checkAllowed(application, request_user, admin_only=True)

    if not application.can_deny():

        m = _(astakos_messages.APPLICATION_CANNOT_DENY %

              (application.id, application.state_display()))

        raise PermissionDenied(m)

    qh_release_pending_app(application.owner)

    application.deny(reason)

    logger.info("%s has been denied with reason \"%s\"." %

                (application.log_display, reason))

    application_deny_notify(application)

def approve_application(app_id, request_user=None, reason=""):

    try:

        objects = ProjectApplication.objects

        application = objects.get_for_update(id=app_id)

    except ProjectApplication.DoesNotExist:

        m = _(astakos_messages.UNKNOWN_PROJECT_APPLICATION_ID % (app_id,))

        raise PermissionDenied(m)

    checkAllowed(application, request_user, admin_only=True)

    if not application.can_approve():

        m = _(astakos_messages.APPLICATION_CANNOT_APPROVE %

              (application.id, application.state_display()))

        raise PermissionDenied(m)

    qh_release_pending_app(application.owner)

    project = application.approve(reason)

    qh_sync_project(project)

    logger.info("%s has been approved." % (application.log_display))

    application_approve_notify(application)

def check_expiration(execute=False):

    objects = Project.objects

    expired = objects.expired_projects()

    if execute:

        for project in expired:

            terminate(project.id)

    return [project.expiration_info() for project in expired]

def terminate(project_id, request_user=None):

    project = get_project_for_update(project_id)

    checkAllowed(project, request_user, admin_only=True)

    checkAlive(project)

    project.terminate()

    qh_sync_project(project)

    logger.info("%s has been terminated." % (project))

    project_termination_notify(project)

def suspend(project_id, request_user=None):

    project = get_project_for_update(project_id)

    checkAllowed(project, request_user, admin_only=True)

    checkAlive(project)

    project.suspend()

    qh_sync_project(project)

    logger.info("%s has been suspended." % (project))

    project_suspension_notify(project)

def resume(project_id, request_user=None):

    project = get_project_for_update(project_id)

    checkAllowed(project, request_user, admin_only=True)

    if not project.is_suspended:

        m = _(astakos_messages.NOT_SUSPENDED_PROJECT) % project.__dict__

        raise PermissionDenied(m)

    project.resume()

    qh_sync_project(project)

    logger.info("%s has been unsuspended." % (project))

def get_by_chain_or_404(chain_id):

    try:

        project = Project.objects.get(id=chain_id)

        application = project.application

        return project, application

    except:

        application = ProjectApplication.objects.latest_of_chain(chain_id)

        if application is None:

            raise Http404

        else:

            return None, application

def get_user_setting(user_id, key):

    try:

        setting = UserSetting.objects.get(

            user=user_id, setting=key)

        return setting.value

    except UserSetting.DoesNotExist:

        return getattr(settings, key)

def set_user_setting(user_id, key, value):

    try:

        setting = UserSetting.objects.get_for_update(

            user=user_id, setting=key)

    except UserSetting.DoesNotExist:

        setting = UserSetting(user_id=user_id, setting=key)

    setting.value = value

    setting.save()

def unset_user_setting(user_id, key):

    UserSetting.objects.filter(user=user_id, setting=key).delete()

def _partition_by(f, l):

    d = {}

    for x in l:

        group = f(x)

        group_l = d.get(group, [])

        group_l.append(x)

        d[group] = group_l

    return d

def count_pending_app(users):

    users = list(users)

    apps = ProjectApplication.objects.filter(state=ProjectApplication.PENDING,

                                             owner__in=users)

    apps_d = _partition_by(lambda a: a.owner.uuid, apps)

    usage = {}

    for user in users:

        uuid = user.uuid

        usage[uuid] = len(apps_d.get(uuid, []))

    return usage

def qh_add_pending_app(user, precursor=None, force=False, dry_run=False):

    if precursor is None:

        diff = 1

    else:

        chain = precursor.chain

        objs = ProjectApplication.objects

        q = objs.filter(chain=chain, state=ProjectApplication.PENDING)

        count = q.count()

        diff = 1 - count

    return register_pending_apps(user, diff, force, dry_run)

def qh_release_pending_app(user):

    register_pending_apps(user, -1)