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from typing import cast
from channels.db import database_sync_to_async
from channels.middleware import BaseMiddleware
from channels.routing import URLRouter
from django.conf import settings
from django.db.models import Q
from django.urls import URLResolver, path
from django.utils.encoding import force_bytes, force_str
from django.utils.module_loading import import_string
from django_pgschemas.models import TenantModel as TenantModelBase
from django_pgschemas.routing.info import DomainInfo, HeadersInfo
from django_pgschemas.routing.urlresolvers import get_ws_urlconf_from_schema
from django_pgschemas.schema import Schema
from django_pgschemas.settings import get_tenant_header
from django_pgschemas.utils import get_domain_model, get_tenant_model, remove_www
def TenantURLRouter():
async def router(scope, receive, send):
schema: Schema | None = scope.get("tenant")
routes = []
if schema is not None:
ws_urlconf = get_ws_urlconf_from_schema(schema) if schema else None
if ws_urlconf:
routes = import_string(ws_urlconf + ".urlpatterns")
match (routes, schema.routing):
case ([URLResolver()], DomainInfo(_, folder)) if folder:
routes = [path(f"{folder}/", URLRouter(routes[0].url_patterns))]
case _:
pass
_router = URLRouter(routes)
return await _router(scope, receive, send)
return router
class BaseRoutingMiddleware(BaseMiddleware):
@database_sync_to_async
def get_scope_tenant(self, scope):
raise NotImplementedError
async def __call__(self, scope, receive, send):
scope = dict(scope)
scope["tenant"] = await self.get_scope_tenant(scope)
return await super().__call__(scope, receive, send)
class DomainRoutingMiddleware(BaseRoutingMiddleware):
@database_sync_to_async
def get_scope_tenant(self, scope) -> Schema | None:
hostname = force_str(dict(scope["headers"]).get(b"host", b""))
hostname = remove_www(hostname.split(":")[0])
tenant: Schema | None = None
# Checking for static tenants
for schema, data in settings.TENANTS.items():
if schema in ["public", "default"]:
continue
if hostname in data.get("DOMAINS", []):
tenant = Schema.create(
schema_name=schema,
routing=DomainInfo(domain=hostname),
)
break
# Checking for dynamic tenants
else:
DomainModel = get_domain_model()
prefix = scope["path"].split("/")[1]
domain = None
if DomainModel is not None:
try:
domain = DomainModel.objects.select_related("tenant").get(
domain=hostname, folder=prefix
)
except DomainModel.DoesNotExist:
try:
domain = DomainModel.objects.select_related("tenant").get(
domain=hostname, folder=""
)
except DomainModel.DoesNotExist:
pass
if domain is not None:
tenant = cast(TenantModelBase, domain.tenant)
tenant.routing = DomainInfo(domain=hostname)
if prefix and domain.folder == prefix:
tenant.routing = DomainInfo(domain=hostname, folder=prefix)
# Checking fallback domains
if not tenant:
for schema, data in settings.TENANTS.items():
if schema in ["public", "default"]:
continue
if hostname in data.get("FALLBACK_DOMAINS", []):
tenant = Schema.create(
schema_name=schema,
routing=DomainInfo(domain=hostname),
)
break
return tenant
class HeadersRoutingMiddleware(BaseRoutingMiddleware):
@database_sync_to_async
def get_scope_tenant(self, scope) -> Schema | None:
tenant_header = get_tenant_header()
tenant_ref = force_str(dict(scope["headers"]).get(force_bytes(tenant_header), b""))
if not tenant_ref:
return None
tenant: Schema | None = None
# Checking for static tenants
for schema, data in settings.TENANTS.items():
if schema in ["public", "default"]:
continue
if tenant_ref == schema or tenant_ref == data.get("HEADER"):
tenant = Schema.create(
schema_name=schema, routing=HeadersInfo(reference=tenant_ref)
)
break
# Checking for dynamic tenants
else:
if (TenantModel := get_tenant_model()) is not None:
tenant = TenantModel._default_manager.filter(
Q(pk__iexact=tenant_ref) | Q(schema_name=tenant_ref)
).first()
if tenant is not None:
tenant.routing = HeadersInfo(reference=tenant_ref)
return tenant
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