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import re
from typing import Callable, TypeAlias, cast
from asgiref.sync import iscoroutinefunction, sync_to_async
from django.conf import settings
from django.db.models import Q
from django.http import Http404, HttpRequest, HttpResponse
from django.shortcuts import redirect
from django.urls import clear_url_caches, set_urlconf
from django.utils.decorators import sync_and_async_middleware
from django_pgschemas.models import TenantModel as TenantModelBase
from django_pgschemas.routing.info import DomainInfo, HeadersInfo, SessionInfo
from django_pgschemas.routing.models import get_primary_domain_for_tenant
from django_pgschemas.routing.urlresolvers import get_urlconf_from_schema
from django_pgschemas.schema import Schema, activate, activate_public
from django_pgschemas.settings import get_tenant_header, get_tenant_session_key
from django_pgschemas.utils import get_domain_model, get_tenant_model, remove_www
def strip_tenant_from_path_factory(prefix: str) -> Callable[[str], str]:
def strip_tenant_from_path(path: str) -> str:
return re.sub(r"^/{}/".format(prefix), "/", path)
return strip_tenant_from_path
ResponseHandler: TypeAlias = Callable[[HttpRequest], HttpResponse]
def route_domain(request: HttpRequest) -> HttpResponse | None:
hostname = remove_www(request.get_host().split(":")[0])
activate_public()
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 = request.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)
request.strip_tenant_from_path = lambda x: x
if prefix and domain.folder == prefix:
tenant.routing = DomainInfo(domain=hostname, folder=prefix)
request.strip_tenant_from_path = strip_tenant_from_path_factory(prefix)
clear_url_caches() # Required to remove previous tenant prefix from cache (#8)
if domain.redirect_to_primary:
primary_domain = get_primary_domain_for_tenant(tenant)
if primary_domain:
path = request.strip_tenant_from_path(request.path)
return redirect(primary_domain.absolute_url(path), permanent=True)
# 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
# No tenant found from domain / folder
if not tenant:
raise Http404("No tenant for hostname '%s'" % hostname)
urlconf = get_urlconf_from_schema(tenant)
request.tenant = tenant
request.urlconf = urlconf
set_urlconf(urlconf)
activate(tenant)
return None
def route_session(request: HttpRequest) -> HttpResponse | None:
tenant_session_key = get_tenant_session_key()
if not hasattr(request, "session") or not (
tenant_ref := request.session.get(tenant_session_key)
):
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("SESSION_KEY"):
tenant = Schema.create(schema_name=schema)
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 = SessionInfo(reference=tenant_ref)
request.tenant = tenant
activate(tenant)
return None
def route_headers(request: HttpRequest) -> HttpResponse | None:
tenant_header = get_tenant_header()
if not (tenant_ref := request.headers.get(tenant_header)):
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)
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)
request.tenant = tenant
activate(tenant)
return None
def middleware_factory(
handler: Callable[[HttpRequest], HttpResponse | None],
) -> Callable[[ResponseHandler], ResponseHandler]:
@sync_and_async_middleware
def middleware(get_response: ResponseHandler) -> ResponseHandler:
if iscoroutinefunction(get_response):
async_base_middleware = sync_to_async(handler)
async def sync_middleware(request: HttpRequest) -> HttpResponse | None:
if response := await async_base_middleware(request):
return response
return await get_response(request)
return sync_middleware
else:
def async_middleware(request: HttpRequest) -> HttpResponse | None:
if response := handler(request):
return response
return get_response(request)
return async_middleware
return middleware
DomainRoutingMiddleware = middleware_factory(route_domain)
SessionRoutingMiddleware = middleware_factory(route_session)
HeadersRoutingMiddleware = middleware_factory(route_headers)
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