Synnefo

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

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import uuid

from django.core.validators import validate_email

from django.contrib.auth.models import Permission

from django.contrib.contenttypes.models import ContentType

from django.core.management import CommandError

from synnefo.util import units

from astakos.im.models import AstakosUser

from astakos.im.register import get_resources

import sys

DEFAULT_CONTENT_TYPE = None

def read_from_file(f_name):

    if f_name == '-':

        return sys.stdin.read()

    else:

        try:

            with open(f_name) as file_desc:

                return file_desc.read()

        except IOError as e:

            raise CommandError(e)

def get_user(email_or_id, **kwargs):

    try:

        if email_or_id.isdigit():

            return AstakosUser.objects.get(id=int(email_or_id))

        else:

            return AstakosUser.objects.get(email__iexact=email_or_id, **kwargs)

    except (AstakosUser.DoesNotExist, AstakosUser.MultipleObjectsReturned):

        return None

def get_astakosuser_content_type():

    try:

        return ContentType.objects.get(app_label='im',

                                       model='astakosuser')

    except:

        return DEFAULT_CONTENT_TYPE

def add_user_permission(user, pname):

    content_type = get_astakosuser_content_type()

    if user.has_perm(pname):

        return 0, None

    p, created = Permission.objects.get_or_create(codename=pname,

                                                  name=pname.capitalize(),

                                                  content_type=content_type)

    user.user_permissions.add(p)

    return 1, created

def add_group_permission(group, pname):

    content_type = get_astakosuser_content_type()

    if pname in [p.codename for p in group.permissions.all()]:

        return 0, None

    content_type = ContentType.objects.get(app_label='im',

                                           model='astakosuser')

    p, created = Permission.objects.get_or_create(codename=pname,

                                                  name=pname.capitalize(),

                                                  content_type=content_type)

    group.permissions.add(p)

    return 1, created

def remove_user_permission(user, pname):

    content_type = get_astakosuser_content_type()

    if user.has_perm(pname):

        return 0

    try:

        p = Permission.objects.get(codename=pname,

                                   content_type=content_type)

        user.user_permissions.remove(p)

        return 1

    except Permission.DoesNotExist:

        return -1

def remove_group_permission(group, pname):

    content_type = get_astakosuser_content_type()

    if pname not in [p.codename for p in group.permissions.all()]:

        return 0

    try:

        p = Permission.objects.get(codename=pname,

                                   content_type=content_type)

        group.permissions.remove(p)

        return 1

    except Permission.DoesNotExist:

        return -1

def is_uuid(s):

    if s is None:

        return False

    try:

        uuid.UUID(s)

    except ValueError:

        return False

    else:

        return True

def is_email(s):

    if s is None:

        return False

    try:

        validate_email(s)

    except:

        return False

    else:

        return True

style_options = ', '.join(units.STYLES)

def check_style(style):

    if style not in units.STYLES:

        m = "Invalid unit style. Valid ones are %s." % style_options

        raise CommandError(m)

class ResourceDict(object):

    _object = None

    @classmethod

    def get(cls):

        if cls._object is None:

            cls._object = get_resources()

        return cls._object

def show_resource_value(number, resource, style):

    resources = ResourceDict.get()

    resource_dict = resources.get(resource)

    unit = resource_dict.get('unit') if resource_dict else None

    return units.show(number, unit, style)

def show_quotas(qh_quotas, astakos_initial, info=None, style=None):

    labels = ('source', 'resource', 'base quota', 'total quota', 'usage')

    if info is not None:

        labels = ('uuid', 'email') + labels

    print_data = []

    for holder, holder_quotas in qh_quotas.iteritems():

        h_initial = astakos_initial.get(holder)

        if info is not None:

            email = info.get(holder, "")

        for source, source_quotas in holder_quotas.iteritems():

            s_initial = h_initial.get(source) if h_initial else None

            for resource, values in source_quotas.iteritems():

                initial = s_initial.get(resource) if s_initial else None

                initial = show_resource_value(initial, resource, style)

                limit = show_resource_value(values['limit'], resource, style)

                usage = show_resource_value(values['usage'], resource, style)

                fields = (source, resource, initial, limit, usage)

                if info is not None:

                    fields = (holder, email) + fields

                print_data.append(fields)

    return print_data, labels