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

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

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# The views and conclusions contained in the software and

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# 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 urlparse import urljoin

from smtplib import SMTPException

from datetime import datetime

from functools import wraps

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,

    PROJECT_MEMBER_JOIN_POLICIES, PROJECT_MEMBER_LEAVE_POLICIES)

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)

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.

    Raises SendVerificationError

    """

    url = '%s?auth=%s&next=%s' % (urljoin(BASEURL, reverse('activate')),

                                  quote(user.auth_token),

                                  quote(urljoin(BASEURL, reverse('index'))))

    message = render_to_string(template_name, {

                               'user': user,

                               'url': url,

                               'baseurl': BASEURL,

                               'site_name': SITENAME,

                               'support': CONTACT_EMAIL})

    sender = settings.SERVER_EMAIL

    try:

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

                  connection=get_connection())

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendVerificationError()

    else:

        msg = 'Sent activation %s' % user.email

        logger.log(LOGGING_LEVEL, msg)

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

    send_verification(user, template_name)

    user.activation_sent = datetime.now()

    user.save()

def _send_admin_notification(template_name,

                             dictionary=None,

                             subject='alpha2 testing notification',):

    """

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

    Raises SendNotificationError

    """

    dictionary = dictionary or {}

    message = render_to_string(template_name, dictionary)

    sender = settings.SERVER_EMAIL

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

    try:

        send_mail(subject, message, sender, recipient_list,

                  connection=get_connection())

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendNotificationError()

    else:

        user = dictionary.get('user')

        msg = 'Sent admin notification for user %s' % user.log_display

        logger.log(LOGGING_LEVEL, msg)

def send_account_creation_notification(template_name, dictionary=None):

    user = dictionary.get('user')

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

    return _send_admin_notification(template_name, dictionary, subject=subject)

def send_helpdesk_notification(user, template_name='im/helpdesk_notification.txt'):

    """

    Send email to settings.HELPDESK list to notify for a new user activation.

    Raises SendNotificationError

    """

    message = render_to_string(

        template_name,

        {'user': user}

    )

    sender = settings.SERVER_EMAIL

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

    try:

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

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

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendNotificationError()

    else:

        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.

    Raises SendInvitationError

    """

    subject = _(INVITATION_EMAIL_SUBJECT)

    url = '%s?code=%d' % (urljoin(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

    try:

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

                  connection=get_connection())

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendInvitationError()

    else:

        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.

    Raises SMTPException, socket.error

    """

    subject = _(GREETING_EMAIL_SUBJECT)

    message = render_to_string(email_template_name, {

                               'user': user,

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

                               'baseurl': BASEURL,

                               'site_name': SITENAME,

                               'support': CONTACT_EMAIL})

    sender = settings.SERVER_EMAIL

    try:

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

                  connection=get_connection())

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendGreetingError()

    else:

        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 activate(

    user,

    email_template_name='im/welcome_email.txt',

    helpdesk_email_template_name='im/helpdesk_notification.txt',

    verify_email=False):

    """

    Activates the specific user and sends email.

    Raises SendGreetingError, ValidationError

    """

    user.is_active = True

    user.email_verified = True

    if not user.activation_sent:

        user.activation_sent = datetime.now()

    user.save()

    qh_sync_user(user.id)

    send_helpdesk_notification(user, helpdesk_email_template_name)

    send_greeting(user, email_template_name)

def deactivate(user):

    user.is_active = False

    user.save()

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()

def switch_account_to_shibboleth(user, local_user,

                                 greeting_template_name='im/welcome_email.txt'):

    try:

        provider = user.provider

    except AttributeError:

        return

    else:

        if not provider == 'shibboleth':

            return

        user.delete()

        local_user.provider = 'shibboleth'

        local_user.third_party_identifier = user.third_party_identifier

        local_user.save()

        send_greeting(local_user, greeting_template_name)

        return local_user

class SendMailError(Exception):

    pass

class SendAdminNotificationError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.ADMIN_NOTIFICATION_SEND_ERR)

        super(SendAdminNotificationError, self).__init__()

class SendVerificationError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.VERIFICATION_SEND_ERR)

        super(SendVerificationError, self).__init__()

class SendInvitationError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.INVITATION_SEND_ERR)

        super(SendInvitationError, self).__init__()

class SendGreetingError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.GREETING_SEND_ERR)

        super(SendGreetingError, self).__init__()

class SendFeedbackError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.FEEDBACK_SEND_ERR)

        super(SendFeedbackError, self).__init__()

class ChangeEmailError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.CHANGE_EMAIL_SEND_ERR)

        super(ChangeEmailError, self).__init__()

class SendNotificationError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.NOTIFICATION_SEND_ERR)

        super(SendNotificationError, self).__init__()

def get_quota(users):

    pass

### 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 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, user_id, request_user=None):

    project = get_project_for_update(project_id)

    accept_membership_checks(project, request_user)

    membership = get_membership_for_update(project_id, user_id)

    if not membership.can_accept():

        m = _(astakos_messages.NOT_MEMBERSHIP_REQUEST)

        raise PermissionDenied(m)

    membership.accept()

    qh_sync_user(user_id)

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

                (membership.person.log_display, project))

    membership_change_notify(project, membership.person, 'accepted')

    return membership

def reject_membership_checks(project, request_user):

    checkAllowed(project, request_user)

    checkAlive(project)

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

    project = get_project_for_update(project_id)

    reject_membership_checks(project, request_user)

    membership = get_membership_for_update(project_id, user_id)

    if not membership.can_reject():

        m = _(astakos_messages.NOT_MEMBERSHIP_REQUEST)

        raise PermissionDenied(m)

    membership.reject()

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

                (membership.person.log_display, project))

    membership_change_notify(project, membership.person, '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, user_id, request_user=None):

    project = get_project_for_update(project_id)

    remove_membership_checks(project, request_user)

    membership = get_membership_for_update(project_id, user_id)

    if not membership.can_remove():

        m = _(astakos_messages.NOT_ACCEPTED_MEMBERSHIP)

        raise PermissionDenied(m)

    membership.remove()

    qh_sync_user(user_id)

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

                (membership.person.log_display, project))

    membership_change_notify(project, membership.person, '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.id)

    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.id)

        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.id)

        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(kw, request_user=None):

    kw['applicant'] = request_user

    resource_policies = kw.pop('resource_policies', None)

    precursor = None

    precursor_id = kw.get('precursor_application', None)

    if precursor_id is not None:

        objs = ProjectApplication.objects

        precursor = objs.get_for_update(id=precursor_id)

        kw['precursor_application'] = precursor

        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)

    owner = kw['owner']

    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(**kw)

    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):

    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):

    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=None):

    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)

    if reason is None:

        reason = ""

    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):

    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()

    qh_sync_projects([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_projects([project])

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

    project_termination_notify(project)

def suspend(project_id, request_user=None):

    project = get_project_by_id(project_id)

    checkAllowed(project, request_user, admin_only=True)

    checkAlive(project)

    project.suspend()

    qh_sync_projects([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_projects([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):

    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)

def qh_sync_projects(projects):

    memberships = ProjectMembership.objects.filter(project__in=projects)

    user_ids = set(m.person_id for m in memberships)

    qh_sync_users(user_ids)