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import os
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import json
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import glob
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from django.conf import settings, UserSettingsHolder
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from tenant_schemas.middleware import TenantMiddleware
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from django.db import connection
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from django.http import Http404
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from django.contrib.contenttypes.models import ContentType
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from tenant_schemas.utils import get_tenant_model, remove_www_and_dev, get_public_schema_name
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SENTINEL = object()
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class EOTenantMiddleware(TenantMiddleware):
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def __init__(self, *args, **kwargs):
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self.wrapped = settings._wrapped
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class TenantNotFound(RuntimeError):
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pass
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class TenantMiddleware(object):
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"""
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This middleware should be placed at the very top of the middleware stack.
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Selects the proper database schema using the request host. Can fail in
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various ways which is better than corrupting or revealing data...
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"""
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@classmethod
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def base(cls):
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return settings.TENANT_BASE
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@classmethod
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def hostname2schema(cls, hostname):
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'''Convert hostname to PostgreSQL schema name'''
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if hostname in getattr(settings, 'TENANT_MAPPING', {}):
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return settings.TENANT_MAPPING[hostname]
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return hostname.replace('.', '_').replace('-', '_')
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@classmethod
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def get_tenant_by_hostname(cls, hostname):
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'''Retrieve a tenant object for this hostname'''
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schema = cls.hostname2schema(hostname)
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p = os.path.join(cls.base(), schema)
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if not os.path.exists(p):
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raise TenantNotFound
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return get_tenant_model()(schema_name=schema, domain_url=hostname)
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@classmethod
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def get_tenants(cls):
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self = cls()
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for path in glob.glob(os.path.join(cls.base(), '*')):
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hostname = os.path.basename(path)
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yield get_tenant_model()(
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schema_name=self.hostname2schema(hostname),
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domain_url=hostname)
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def process_request(self, request):
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super(EOTenantMiddleware, self).process_request(request)
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override = UserSettingsHolder(self.wrapped)
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for client_settings in request.tenant.clientsetting_set.all():
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setattr(override, client_settings.name, client_settings.json)
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settings._wrapped = override
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# connection needs first to be at the public schema, as this is where the
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# tenant informations are saved
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connection.set_schema_to_public()
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hostname_without_port = remove_www_and_dev(request.get_host().split(':')[0])
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try:
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request.tenant = self.get_tenant_by_hostname(hostname_without_port)
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except TenantNotFound:
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raise Http404
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connection.set_tenant(request.tenant)
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# content type can no longer be cached as public and tenant schemas have different
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# models. if someone wants to change this, the cache needs to be separated between
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# public and shared schemas. if this cache isn't cleared, this can cause permission
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# problems. for example, on public, a particular model has id 14, but on the tenants
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# it has the id 15. if 14 is cached instead of 15, the permissions for the wrong
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# model will be fetched.
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ContentType.objects.clear_cache()
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# do we have a public-specific token?
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if hasattr(settings, 'PUBLIC_SCHEMA_URLCONF') and request.tenant.schema_name == get_public_schema_name():
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request.urlconf = settings.PUBLIC_SCHEMA_URLCONF
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def process_response(self, request, response):
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settings._wrapped = self.wrapped
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return response
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class DictAdapter(dict):
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def __init__(self, wrapped):
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