Require direct references to configuration variables. (#10985)

This removes the magic allowing accessing configurable
variables directly from the config object. It is now required
that a specific configuration class is used (e.g. `config.foo`
must be replaced with `config.server.foo`).

11 files changed, 33 insertions, 73 deletions

diff --git a/synapse/config/_base.py b/synapse/config/_base.py
index 26152b0924..7c4428a138 100644
--- a/synapse/config/_base.py
+++ b/synapse/config/_base.py
@@ -118,21 +118,6 @@ class Config:
             "synapse", "res/templates"
         )
 
-    def __getattr__(self, item: str) -> Any:
-        """
-        Try and fetch a configuration option that does not exist on this class.
-
-        This is so that existing configs that rely on `self.value`, where value
-        is actually from a different config section, continue to work.
-        """
-        if item in ["generate_config_section", "read_config"]:
-            raise AttributeError(item)
-
-        if self.root is None:
-            raise AttributeError(item)
-        else:
-            return self.root._get_unclassed_config(self.section, item)
-
     @staticmethod
     def parse_size(value):
         if isinstance(value, int):
@@ -289,7 +274,9 @@ class Config:
         env.filters.update(
             {
                 "format_ts": _format_ts_filter,
-                "mxc_to_http": _create_mxc_to_http_filter(self.public_baseurl),
+                "mxc_to_http": _create_mxc_to_http_filter(
+                    self.root.server.public_baseurl
+                ),
             }
         )
 
@@ -311,8 +298,6 @@ class RootConfig:
     config_classes = []
 
     def __init__(self):
-        self._configs = OrderedDict()
-
         for config_class in self.config_classes:
             if config_class.section is None:
                 raise ValueError("%r requires a section name" % (config_class,))
@@ -321,42 +306,7 @@ class RootConfig:
                 conf = config_class(self)
             except Exception as e:
                 raise Exception("Failed making %s: %r" % (config_class.section, e))
-            self._configs[config_class.section] = conf
-
-    def __getattr__(self, item: str) -> Any:
-        """
-        Redirect lookups on this object either to config objects, or values on
-        config objects, so that `config.tls.blah` works, as well as legacy uses
-        of things like `config.server.server_name`. It will first look up the config
-        section name, and then values on those config classes.
-        """
-        if item in self._configs.keys():
-            return self._configs[item]
-
-        return self._get_unclassed_config(None, item)
-
-    def _get_unclassed_config(self, asking_section: Optional[str], item: str):
-        """
-        Fetch a config value from one of the instantiated config classes that
-        has not been fetched directly.
-
-        Args:
-            asking_section: If this check is coming from a Config child, which
-                one? This section will not be asked if it has the value.
-            item: The configuration value key.
-
-        Raises:
-            AttributeError if no config classes have the config key. The body
-                will contain what sections were checked.
-        """
-        for key, val in self._configs.items():
-            if key == asking_section:
-                continue
-
-            if item in dir(val):
-                return getattr(val, item)
-
-        raise AttributeError(item, "not found in %s" % (list(self._configs.keys()),))
+            setattr(self, config_class.section, conf)
 
     def invoke_all(self, func_name: str, *args, **kwargs) -> MutableMapping[str, Any]:
         """
@@ -373,9 +323,11 @@ class RootConfig:
         """
         res = OrderedDict()
 
-        for name, config in self._configs.items():
+        for config_class in self.config_classes:
+            config = getattr(self, config_class.section)
+
             if hasattr(config, func_name):
-                res[name] = getattr(config, func_name)(*args, **kwargs)
+                res[config_class.section] = getattr(config, func_name)(*args, **kwargs)
 
         return res
 
diff --git a/synapse/config/account_validity.py b/synapse/config/account_validity.py
index ffaffc4931..b56c2a24df 100644
--- a/synapse/config/account_validity.py
+++ b/synapse/config/account_validity.py
@@ -76,7 +76,7 @@ class AccountValidityConfig(Config):
             )
 
         if self.account_validity_renew_by_email_enabled:
-            if not self.public_baseurl:
+            if not self.root.server.public_baseurl:
                 raise ConfigError("Can't send renewal emails without 'public_baseurl'")
 
         # Load account validity templates.
diff --git a/synapse/config/cas.py b/synapse/config/cas.py
index 901f4123e1..9b58ecf3d8 100644
--- a/synapse/config/cas.py
+++ b/synapse/config/cas.py
@@ -37,7 +37,7 @@ class CasConfig(Config):
 
             # The public baseurl is required because it is used by the redirect
             # template.
-            public_baseurl = self.public_baseurl
+            public_baseurl = self.root.server.public_baseurl
             if not public_baseurl:
                 raise ConfigError("cas_config requires a public_baseurl to be set")
 
diff --git a/synapse/config/emailconfig.py b/synapse/config/emailconfig.py
index 936abe6178..8ff59aa2f8 100644
--- a/synapse/config/emailconfig.py
+++ b/synapse/config/emailconfig.py
@@ -19,7 +19,6 @@ import email.utils
 import logging
 import os
 from enum import Enum
-from typing import Optional
 
 import attr
 
@@ -135,7 +134,7 @@ class EmailConfig(Config):
             # msisdn is currently always remote while Synapse does not support any method of
             # sending SMS messages
             ThreepidBehaviour.REMOTE
-            if self.account_threepid_delegate_email
+            if self.root.registration.account_threepid_delegate_email
             else ThreepidBehaviour.LOCAL
         )
         # Prior to Synapse v1.4.0, there was another option that defined whether Synapse would
@@ -144,7 +143,7 @@ class EmailConfig(Config):
         # identity server in the process.
         self.using_identity_server_from_trusted_list = False
         if (
-            not self.account_threepid_delegate_email
+            not self.root.registration.account_threepid_delegate_email
             and config.get("trust_identity_server_for_password_resets", False) is True
         ):
             # Use the first entry in self.trusted_third_party_id_servers instead
@@ -156,7 +155,7 @@ class EmailConfig(Config):
 
                 # trusted_third_party_id_servers does not contain a scheme whereas
                 # account_threepid_delegate_email is expected to. Presume https
-                self.account_threepid_delegate_email: Optional[str] = (
+                self.root.registration.account_threepid_delegate_email = (
                     "https://" + first_trusted_identity_server
                 )
                 self.using_identity_server_from_trusted_list = True
@@ -335,7 +334,7 @@ class EmailConfig(Config):
                 "client_base_url", email_config.get("riot_base_url", None)
             )
 
-        if self.account_validity_renew_by_email_enabled:
+        if self.root.account_validity.account_validity_renew_by_email_enabled:
             expiry_template_html = email_config.get(
                 "expiry_template_html", "notice_expiry.html"
             )
diff --git a/synapse/config/key.py b/synapse/config/key.py
index 94a9063043..015dbb8a67 100644
--- a/synapse/config/key.py
+++ b/synapse/config/key.py
@@ -145,11 +145,13 @@ class KeyConfig(Config):
 
         # list of TrustedKeyServer objects
         self.key_servers = list(
-            _parse_key_servers(key_servers, self.federation_verify_certificates)
+            _parse_key_servers(
+                key_servers, self.root.tls.federation_verify_certificates
+            )
         )
 
         self.macaroon_secret_key = config.get(
-            "macaroon_secret_key", self.registration_shared_secret
+            "macaroon_secret_key", self.root.registration.registration_shared_secret
         )
 
         if not self.macaroon_secret_key:
diff --git a/synapse/config/oidc.py b/synapse/config/oidc.py
index 7e67fbada1..10f5796330 100644
--- a/synapse/config/oidc.py
+++ b/synapse/config/oidc.py
@@ -58,7 +58,7 @@ class OIDCConfig(Config):
                     "Multiple OIDC providers have the idp_id %r." % idp_id
                 )
 
-        public_baseurl = self.public_baseurl
+        public_baseurl = self.root.server.public_baseurl
         if public_baseurl is None:
             raise ConfigError("oidc_config requires a public_baseurl to be set")
         self.oidc_callback_url = public_baseurl + "_synapse/client/oidc/callback"
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 7cffdacfa5..a3d2a38c4c 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -45,7 +45,10 @@ class RegistrationConfig(Config):
         account_threepid_delegates = config.get("account_threepid_delegates") or {}
         self.account_threepid_delegate_email = account_threepid_delegates.get("email")
         self.account_threepid_delegate_msisdn = account_threepid_delegates.get("msisdn")
-        if self.account_threepid_delegate_msisdn and not self.public_baseurl:
+        if (
+            self.account_threepid_delegate_msisdn
+            and not self.root.server.public_baseurl
+        ):
             raise ConfigError(
                 "The configuration option `public_baseurl` is required if "
                 "`account_threepid_delegate.msisdn` is set, such that "
@@ -85,7 +88,7 @@ class RegistrationConfig(Config):
         if mxid_localpart:
             # Convert the localpart to a full mxid.
             self.auto_join_user_id = UserID(
-                mxid_localpart, self.server_name
+                mxid_localpart, self.root.server.server_name
             ).to_string()
 
         if self.autocreate_auto_join_rooms:
diff --git a/synapse/config/repository.py b/synapse/config/repository.py
index 7481f3bf5f..69906a98d4 100644
--- a/synapse/config/repository.py
+++ b/synapse/config/repository.py
@@ -94,7 +94,7 @@ class ContentRepositoryConfig(Config):
         # Only enable the media repo if either the media repo is enabled or the
         # current worker app is the media repo.
         if (
-            self.enable_media_repo is False
+            self.root.server.enable_media_repo is False
             and config.get("worker_app") != "synapse.app.media_repository"
         ):
             self.can_load_media_repo = False
diff --git a/synapse/config/saml2.py b/synapse/config/saml2.py
index 05e983625d..9c51b6a25a 100644
--- a/synapse/config/saml2.py
+++ b/synapse/config/saml2.py
@@ -199,7 +199,7 @@ class SAML2Config(Config):
         """
         import saml2
 
-        public_baseurl = self.public_baseurl
+        public_baseurl = self.root.server.public_baseurl
         if public_baseurl is None:
             raise ConfigError("saml2_config requires a public_baseurl to be set")
 
diff --git a/synapse/config/server_notices.py b/synapse/config/server_notices.py
index 48bf3241b6..bde4e879d9 100644
--- a/synapse/config/server_notices.py
+++ b/synapse/config/server_notices.py
@@ -73,7 +73,9 @@ class ServerNoticesConfig(Config):
             return
 
         mxid_localpart = c["system_mxid_localpart"]
-        self.server_notices_mxid = UserID(mxid_localpart, self.server_name).to_string()
+        self.server_notices_mxid = UserID(
+            mxid_localpart, self.root.server.server_name
+        ).to_string()
         self.server_notices_mxid_display_name = c.get("system_mxid_display_name", None)
         self.server_notices_mxid_avatar_url = c.get("system_mxid_avatar_url", None)
         # todo: i18n
diff --git a/synapse/config/sso.py b/synapse/config/sso.py
index 524a7ff3aa..11a9b76aa0 100644
--- a/synapse/config/sso.py
+++ b/synapse/config/sso.py
@@ -103,8 +103,10 @@ class SSOConfig(Config):
         # the client's.
         # public_baseurl is an optional setting, so we only add the fallback's URL to the
         # list if it's provided (because we can't figure out what that URL is otherwise).
-        if self.public_baseurl:
-            login_fallback_url = self.public_baseurl + "_matrix/static/client/login"
+        if self.root.server.public_baseurl:
+            login_fallback_url = (
+                self.root.server.public_baseurl + "_matrix/static/client/login"
+            )
             self.sso_client_whitelist.append(login_fallback_url)
 
     def generate_config_section(self, **kwargs):