filter/domain_redirect_mappings: add auto_build_alias parameter

- Extend filter signature with auto_build_alias flag to control automatic
  default→canonical alias creation
- group_vars/all: introduce AUTO_BUILD_ALIASES variable for global toggle
- Update unit tests: adjust calls to new signature and add dedicated
  test cases for auto_build_aliases=False

Ref: conversation https://chatgpt.com/share/68cd512c-c878-800f-bdf2-81737adf7e0e

filter_plugins/domain_redirect_mappings.py

@@ -7,7 +7,7 @@ class FilterModule(object):
     def filters(self):
         return {'domain_mappings': self.domain_mappings}
 
-    def domain_mappings(self, apps, PRIMARY_DOMAIN):
+    def domain_mappings(self, apps, primary_domain, auto_build_alias):
         """
         Build a flat list of redirect mappings for all apps:
           - source: each alias domain
@@ -43,7 +43,7 @@ class FilterModule(object):
             domains_cfg = cfg.get('server',{}).get('domains',{})
             entry = domains_cfg.get('canonical')
             if entry is None:
-                canonical_map[app_id] = [default_domain(app_id, PRIMARY_DOMAIN)]
+                canonical_map[app_id] = [default_domain(app_id, primary_domain)]
             elif isinstance(entry, dict):
                 canonical_map[app_id] = list(entry.values())
             elif isinstance(entry, list):
@@ -61,11 +61,11 @@ class FilterModule(object):
                 alias_map[app_id] = []
                 continue
             if isinstance(domains_cfg, dict) and not domains_cfg:
-                alias_map[app_id] = [default_domain(app_id, PRIMARY_DOMAIN)]
+                alias_map[app_id] = [default_domain(app_id, primary_domain)]
                 continue
 
             aliases = parse_entry(domains_cfg, 'aliases', app_id) or []
-            default = default_domain(app_id, PRIMARY_DOMAIN)
+            default = default_domain(app_id, primary_domain)
             has_aliases = 'aliases' in domains_cfg
             has_canonical = 'canonical' in domains_cfg
 
@@ -74,7 +74,7 @@ class FilterModule(object):
                     aliases.append(default)
             elif has_canonical:
                 canon = canonical_map.get(app_id, [])
-                if default not in canon and default not in aliases:
+                if default not in canon and default not in aliases and auto_build_alias:
                     aliases.append(default)
 
             alias_map[app_id] = aliases
@@ -84,7 +84,7 @@ class FilterModule(object):
         mappings = []
         for app_id, sources in alias_map.items():
             canon_list = canonical_map.get(app_id, [])
-            target = canon_list[0] if canon_list else default_domain(app_id, PRIMARY_DOMAIN)
+            target = canon_list[0] if canon_list else default_domain(app_id, primary_domain)
             for src in sources:
                 if src == target:
                     # skip self-redirects

group_vars/all/00_general.yml

@@ -32,6 +32,8 @@ WEBSOCKET_PROTOCOL:     "{{ 'wss' if WEB_PROTOCOL == 'https' else 'ws' }}"
 # WWW-Redirect to None WWW-Domains enabled
 WWW_REDIRECT_ENABLED:   "{{ ('web-opt-rdr-www' in group_names) | bool }}"
 
+AUTO_BUILD_ALIASES:     False # If enabled it creates an alias domain for each web application by the entity name, recommended to set to false to safge domain space
+
 # Domain
 PRIMARY_DOMAIN:                           "localhost" # Primary Domain of the server
 

tests/unit/filter_plugins/test_domain_mappings.py

@@ -18,20 +18,20 @@ class TestDomainMappings(unittest.TestCase):
 
     def test_empty_apps(self):
         apps = {}
-        result = self.filter.domain_mappings(apps, self.primary)
+        result = self.filter.domain_mappings(apps, self.primary, True)
         self.assertEqual(result, [])
 
     def test_app_without_domains(self):
         apps = {'web-app-desktop': {}}
         # no domains key → no mappings
-        result = self.filter.domain_mappings(apps, self.primary)
+        result = self.filter.domain_mappings(apps, self.primary, True)
         self.assertEqual(result, [])
 
     def test_empty_domains_cfg(self):
         apps = {'web-app-desktop': {'domains': {}}}
         default = 'desktop.example.com'
         expected = []
-        result = self.filter.domain_mappings(apps, self.primary)
+        result = self.filter.domain_mappings(apps, self.primary, True)
         self.assertEqual(result, expected)
 
     def test_explicit_aliases(self):
@@ -46,7 +46,7 @@ class TestDomainMappings(unittest.TestCase):
         expected = [
             {'source': 'alias.com',    'target': default},
         ]
-        result = self.filter.domain_mappings(apps, self.primary)
+        result = self.filter.domain_mappings(apps, self.primary, True)
         # order not important
         self.assertCountEqual(result, expected)
 
@@ -61,7 +61,7 @@ class TestDomainMappings(unittest.TestCase):
         expected = [
             {'source': 'desktop.example.com', 'target': 'foo.com'}
         ]
-        result = self.filter.domain_mappings(apps, self.primary)
+        result = self.filter.domain_mappings(apps, self.primary, True)
         self.assertEqual(result, expected)
 
     def test_canonical_dict(self):
@@ -78,7 +78,7 @@ class TestDomainMappings(unittest.TestCase):
         expected = [
             {'source': 'desktop.example.com', 'target': 'one.com'}
         ]
-        result = self.filter.domain_mappings(apps, self.primary)
+        result = self.filter.domain_mappings(apps, self.primary, True)
         self.assertEqual(result, expected)
 
     def test_multiple_apps(self):
@@ -94,7 +94,7 @@ class TestDomainMappings(unittest.TestCase):
             {'source': 'a1.com',              'target': 'desktop.example.com'},
             {'source': 'mastodon.example.com',    'target': 'c2.com'},
         ]
-        result = self.filter.domain_mappings(apps, self.primary)
+        result = self.filter.domain_mappings(apps, self.primary, True)
         self.assertCountEqual(result, expected)
         
     def test_multiple_aliases(self):
@@ -108,7 +108,7 @@ class TestDomainMappings(unittest.TestCase):
             {'source': 'a1.com', 'target': 'desktop.example.com'},
             {'source': 'a2.com', 'target': 'desktop.example.com'}
         ]
-        result = self.filter.domain_mappings(apps, self.primary)
+        result = self.filter.domain_mappings(apps, self.primary, True)
         self.assertCountEqual(result, expected)
 
     def test_invalid_aliases_type(self):
@@ -116,8 +116,77 @@ class TestDomainMappings(unittest.TestCase):
             'web-app-desktop': {'server':{'domains': {'aliases': 123}}}
         }
         with self.assertRaises(AnsibleFilterError):
-            self.filter.domain_mappings(apps, self.primary)
+            self.filter.domain_mappings(apps, self.primary, True)
 
+    def test_canonical_not_default_no_autobuild(self):
+        """
+        When only a canonical different from the default exists and auto_build_aliases is False,
+        we should NOT auto-generate a default alias -> canonical mapping.
+        """
+        apps = {
+            'web-app-desktop': {
+                'server': {
+                    'domains': {'canonical': ['foo.com']}
+                }
+            }
+        }
+        result = self.filter.domain_mappings(apps, self.primary, False)
+        self.assertEqual(result, [])  # no auto-added default alias
+
+    def test_aliases_and_canonical_no_autobuild_still_adds_default(self):
+        """
+        If explicit aliases are present, the filter always appends the default domain
+        to the alias list (to cover 'www'/'root' style defaults), regardless of auto_build_aliases.
+        With a canonical set, both the explicit alias and the default should point to the canonical.
+        """
+        apps = {
+            'web-app-desktop': {
+                'server': {
+                    'domains': {
+                        'aliases': ['alias.com'],
+                        'canonical': ['foo.com']
+                    }
+                }
+            }
+        }
+        expected = [
+            {'source': 'alias.com',           'target': 'foo.com'},
+            {'source': 'desktop.example.com', 'target': 'foo.com'},
+        ]
+        result = self.filter.domain_mappings(apps, self.primary, False)
+        self.assertCountEqual(result, expected)
+
+    def test_mixed_apps_no_autobuild(self):
+        """
+        One app with only canonical (no aliases) and one app with only aliases:
+        - The canonical-only app produces no mappings when auto_build_aliases is False.
+        - The alias-only app maps its aliases to its default domain; default self-mapping is skipped.
+        """
+        apps = {
+            'web-app-desktop': {
+                'server': {'domains': {'canonical': ['c1.com']}}
+            },
+            'web-app-mastodon': {
+                'server': {'domains': {'aliases': ['m1.com']}}
+            },
+        }
+        expected = [
+            {'source': 'm1.com', 'target': 'mastodon.example.com'},
+        ]
+        result = self.filter.domain_mappings(apps, self.primary, False)
+        self.assertCountEqual(result, expected)
+
+    def test_no_domains_key_no_autobuild(self):
+        """
+        App ohne 'server.domains' erzeugt keine Mappings, unabhängig von auto_build_aliases.
+        """
+        apps = {
+            'web-app-desktop': {
+                # no 'server' or 'domains'
+            }
+        }
+        result = self.filter.domain_mappings(apps, self.primary, False)
+        self.assertEqual(result, [])
 
 if __name__ == "__main__":
     unittest.main()