do no rely on pkg_resources to get loaded (#48762)

README

@@ -9,8 +9,13 @@ The django-kerberos_ project is used as a basis for this plugin.
 Install
 -------
 
-You just have to install the package in your virtualenv and relaunch, it will
-be automatically loaded by authentic2.
+You just have to install the package in your virtualenv and register the plugin :
+
+  import authentic2_auth_kerberos
+
+  INSTALLED_APPS, TENANT_APPS, AUTHENTICATION_BACKENDS, AUTH_FRONTENDS = authentic2_auth_kerberos.register(
+      INSTALLED_APPS, TENANT_APPS, AUTHENTICATION_BACKENDS, AUTH_FRONTENDS
+  )
 
 You must define the KRB5_KTNAME environment to the path of a keytab file
 containing the key for your service principal. See django-kerberos_

setup.py

@@ -73,9 +73,4 @@ setup(
         'authentic2',
         'django-kerberos',
     ],
-    entry_points={
-        'authentic2.plugin': [
-            'authentic2-auth-kerberos = authentic2_auth_kerberos:Plugin',
-        ],
-    },
     cmdclass={'sdist': version_sdist})

src/authentic2_auth_kerberos/__init__.py

@@ -1,17 +1,22 @@
 default_app_config = 'authentic2_auth_kerberos.apps.Authentic2AuthKerberosConfig'
 
 
-class Plugin(object):
-    def get_before_urls(self):
-        from . import urls
-        return urls.urlpatterns
+def register(installed_apps, tenant_apps, authentication_backends, auth_frontends):
+    apps = []
+    for app in ('authentic2_auth_kerberos', 'django_kerberos'):
+        if app not in installed_apps:
+            apps.append(app)
+    if apps:
+        installed_apps += tuple(apps)
+        tenant_apps += tuple(apps)
 
-    def get_apps(self):
-        return [__name__, 'django_kerberos']
+    for backend in [
+            'authentic2_auth_kerberos.backends.A2LdapKerberosBackend',
+            'authentic2_auth_kerberos.backends.A2KerberosBackend']:
+        if backend not in authentication_backends:
+            authentication_backends += (backend,)
 
-    def get_authentication_backends(self):
-        return ['authentic2_auth_kerberos.backends.A2LdapKerberosBackend',
-                'authentic2_auth_kerberos.backends.A2KerberosBackend']
+    if 'authentic2_auth_kerberos.authenticators.KerberosAuthenticator' not in auth_frontends:
+        auth_frontends += ('authentic2_auth_kerberos.authenticators.KerberosAuthenticator',)
 
-    def get_authenticators(self):
-        return ['authentic2_auth_kerberos.authenticators.KerberosAuthenticator']
+    return installed_apps, tenant_apps, authentication_backends, auth_frontends

src/authentic2_auth_kerberos/apps.py

@@ -8,3 +8,12 @@ class Authentic2AuthKerberosConfig(AppConfig):
     def ready(self):
         # patch authentic2.backends.ldap_backend.LDAPBackend for keys specific to Kerberos support
         from . import backends
+
+    def get_a2_plugin(self):
+        return Plugin()
+
+
+class Plugin(object):
+    def get_before_urls(self):
+        from . import urls
+        return urls.urlpatterns

tests/settings.py

@@ -1,4 +1,6 @@
 import os
+import authentic2_auth_kerberos
+
 
 LANGUAGE_CODE = 'en'
 DATABASES = {
@@ -17,3 +19,9 @@ if 'postgres' in DATABASES['default']['ENGINE']:
 
 ALLOWED_HOSTS = ['localhost']
 A2_AUTH_KERBEROS_ENABLE = True
+
+TENANT_APPS = []
+
+INSTALLED_APPS, TENANT_APPS, AUTHENTICATION_BACKENDS, AUTH_FRONTENDS = authentic2_auth_kerberos.register(
+    INSTALLED_APPS, TENANT_APPS, AUTHENTICATION_BACKENDS, AUTH_FRONTENDS
+)