Ozwillo » Modules CKAN Ozwillo

from hashlib import sha1

import hmac

import requests

import logging

import ckan.plugins as plugins

import ckan.plugins.toolkit as toolkit

import ckan.logic as logic

from pylons import config

from ckan.common import request, _

from ckan.logic.action.create import _group_or_org_create as group_or_org_create

from ckan.logic.action.create import user_create

from ckan.logic.action.delete import _group_or_org_purge

plugin_config_prefix = 'ckanext.ozwillo_organization_api.'

log = logging.getLogger(__name__)

def valid_signature_required(func):

    signature_header_name = config.get(plugin_config_prefix + 'signature_header_name',

                                       'X-Hub-Signature')

    instantiated_secret = config.get(plugin_config_prefix + 'instantiation_secret',

                                     'secret')

    def wrapper(context, data):

        if signature_header_name in request.headers:

            if request.headers[signature_header_name].startswith('sha1='):

                algo, received_hmac = request.headers[signature_header_name].rsplit('=')

                computed_hmac = hmac.new(instantiated_secret, request.body, sha1).hexdigest()

                # the received hmac is uppercase according to

                # http://doc.ozwillo.com/#ref-3-2-1

                if received_hmac != computed_hmac.upper():

                    raise logic.NotAuthorized(_('Invalid HMAC'))

            else:

                raise logic.ValidationError(_('Invalid HMAC algo'))

        else:

            raise logic.NotAuthorized(_("No HMAC in the header"))

        return func(context, data)

    return wrapper

@valid_signature_required

def create_organization(context, data_dict):

    context['ignore_auth'] = True

    model = context['model']

    destruction_secret = config.get(plugin_config_prefix + 'destruction_secret',

                                       'changeme')

    client_id = data_dict.pop('client_id')

    client_secret = data_dict.pop('client_secret')

    instance_id = data_dict.pop('instance_id')

    # re-mapping received dict

    registration_uri = data_dict.pop('instance_registration_uri')

    organization = data_dict['organization']

    user = data_dict['user']

    org_dict = {

        'type': 'organization',

        'name': organization['name'].lower(),

        'id': instance_id,

        'title': organization['name'],

        'description': organization['type'],

        'user': user['name']

    }

    user_dict = {

        'name': user['name'],

        'email': user['email_address'],

        'password': user['id']

    }

    user_obj = model.User.get(user_dict['name'])

    if not user_obj:

        user_create(context, user_dict)

    context['user'] = user_dict['name']

    try:

        delete_uri = toolkit.url_for(controller='api', action='action',

                                     logic_function="delete-organization",

                                     ver=context['api_version'],

                                     qualified=True)

        organization_uri = toolkit.url_for(host=request.host,

                                           controller='organization',

                                           action='read',

                                           id=org_dict['name'],

                                           qualified=True)

        group_or_org_create(context, org_dict, is_org=True)

        # setting organization as active explicitely

        group = model.Group.get(org_dict['name'])

        group.state = 'active'

        group.save()

        # notify about organization creation

        services = {'services': [{

            'local_id': 'organization',

            'name': 'Organization ' + org_dict['name'] + ' on CKAN',

            'service_uri': organization_uri,

            'visible': True}],

            'instance_id': instance_id,

            'destruction_uri': delete_uri,

            'destruction_secret': destruction_secret,

            'needed_scopes': [{

                'scope_id': 'profile',

                'motivation': 'Used to link user to the organization'

            }]

        }

        requests.post(registration_uri,

                      data = services,

                      auth=(client_id, client_secret)

                  )

    except Exception, e:

        log.debug('Exception "%s" occured while creating organization' % e)

        requests.delete(registration_uri)

@valid_signature_required

def delete_organization(context, data_dict):

    data_dict['id'] = data_dict.pop('instance_id')

    context['ignore_auth'] = True

    _group_or_org_purge(context, data_dict, is_org=True)

class OzwilloOrganizationApiPlugin(plugins.SingletonPlugin):

    """

    API for OASIS to create and delete an organization

    """

    plugins.implements(plugins.IActions)

    def get_actions(self):

        return {

            'create-ozwillo-organization': create_organization,

            'delete-ozwillo-organization': delete_organization

        }