Configurable limits on avatars

changelog.d/11846.feature

@@ -0,0 +1 @@
+Allow configuring a maximum file size as well as a list of allowed content types for avatars.

docs/sample_config.yaml

@@ -484,68 +484,19 @@ limit_remote_rooms:
 #
 #show_users_in_user_directory: false
 
-# Message retention policy at the server level.
-#
-# Room admins and mods can define a retention period for their rooms using the
-# 'm.room.retention' state event, and server admins can cap this period by setting
-# the 'allowed_lifetime_min' and 'allowed_lifetime_max' config options.
+# The largest allowed file size for a user avatar. Defaults to no restriction.
 #
-# If this feature is enabled, Synapse will regularly look for and purge events
-# which are older than the room's maximum retention period. Synapse will also
-# filter events received over federation so that events that should have been
-# purged are ignored and not stored again.
+# Note that user avatar changes will not work if this is set without
+# using Synapse's media repository.
 #
-retention:
-  # The message retention policies feature is disabled by default. Uncomment the
-  # following line to enable it.
-  #
-  #enabled: true
-
-  # Default retention policy. If set, Synapse will apply it to rooms that lack the
-  # 'm.room.retention' state event. Currently, the value of 'min_lifetime' doesn't
-  # matter much because Synapse doesn't take it into account yet.
-  #
-  #default_policy:
-  #  min_lifetime: 1d
-  #  max_lifetime: 1y
-
-  # Retention policy limits. If set, a user won't be able to send a
-  # 'm.room.retention' event which features a 'min_lifetime' or a 'max_lifetime'
-  # that's not within this range. This is especially useful in closed federations,
-  # in which server admins can make sure every federating server applies the same
-  # rules.
-  #
-  #allowed_lifetime_min: 1d
-  #allowed_lifetime_max: 1y
+#max_avatar_size: 10M
 
-  # Server admins can define the settings of the background jobs purging the
-  # events which lifetime has expired under the 'purge_jobs' section.
-  #
-  # If no configuration is provided, a single job will be set up to delete expired
-  # events in every room daily.
-  #
-  # Each job's configuration defines which range of message lifetimes the job
-  # takes care of. For example, if 'shortest_max_lifetime' is '2d' and
-  # 'longest_max_lifetime' is '3d', the job will handle purging expired events in
-  # rooms whose state defines a 'max_lifetime' that's both higher than 2 days, and
-  # lower than or equal to 3 days. Both the minimum and the maximum value of a
-  # range are optional, e.g. a job with no 'shortest_max_lifetime' and a
-  # 'longest_max_lifetime' of '3d' will handle every room with a retention policy
-  # which 'max_lifetime' is lower than or equal to three days.
-  #
-  # The rationale for this per-job configuration is that some rooms might have a
-  # retention policy with a low 'max_lifetime', where history needs to be purged
-  # of outdated messages on a very frequent basis (e.g. every 5min), but not want
-  # that purge to be performed by a job that's iterating over every room it knows,
-  # which would be quite heavy on the server.
-  #
-  #purge_jobs:
-  #  - shortest_max_lifetime: 1d
-  #    longest_max_lifetime: 3d
-  #    interval: 5m:
-  #  - shortest_max_lifetime: 3d
-  #    longest_max_lifetime: 1y
-  #    interval: 24h
+# The MIME types allowed for user avatars. Defaults to no restriction.
+#
+# Note that user avatar changes will not work if this is set without
+# using Synapse's media repository.
+#
+#allowed_avatar_mimetypes: ["image/png", "image/jpeg", "image/gif"]
 
 # How long to keep redacted events in unredacted form in the database. After
 # this period redacted events get replaced with their redacted form in the DB.
@@ -1040,30 +991,6 @@ media_store_path: "DATADIR/media_store"
 #
 #max_upload_size: 50M
 
-# The largest allowed size for a user avatar. If not defined, no
-# restriction will be imposed.
-#
-# Note that this only applies when an avatar is changed globally.
-# Per-room avatar changes are not affected. See allow_per_room_profiles
-# for disabling that functionality.
-#
-# Note that user avatar changes will not work if this is set without
-# using Synapse's local media repo.
-#
-#max_avatar_size: 10M
-
-# Allow mimetypes for a user avatar. If not defined, no restriction will
-# be imposed.
-#
-# Note that this only applies when an avatar is changed globally.
-# Per-room avatar changes are not affected. See allow_per_room_profiles
-# for disabling that functionality.
-#
-# Note that user avatar changes will not work if this is set without
-# using Synapse's local media repo.
-#
-#allowed_avatar_mimetypes: ["image/png", "image/jpeg", "image/gif"]
-
 # Maximum number of pixels that will be thumbnailed
 #
 #max_image_pixels: 32M

synapse/config/repository.py

@@ -112,12 +112,6 @@ def read_config(self, config, **kwargs):
         self.max_image_pixels = self.parse_size(config.get("max_image_pixels", "32M"))
         self.max_spider_size = self.parse_size(config.get("max_spider_size", "10M"))
 
-        self.max_avatar_size = config.get("max_avatar_size")
-        if self.max_avatar_size:
-            self.max_avatar_size = self.parse_size(self.max_avatar_size)
-
-        self.allowed_avatar_mimetypes = config.get("allowed_avatar_mimetypes", [])
-
         self.media_store_path = self.ensure_directory(
             config.get("media_store_path", "media_store")
         )
@@ -272,30 +266,6 @@ def generate_config_section(self, data_dir_path, **kwargs):
         #
         #max_upload_size: 50M
 
-        # The largest allowed size for a user avatar. If not defined, no
-        # restriction will be imposed.
-        #
-        # Note that this only applies when an avatar is changed globally.
-        # Per-room avatar changes are not affected. See allow_per_room_profiles
-        # for disabling that functionality.
-        #
-        # Note that user avatar changes will not work if this is set without
-        # using Synapse's local media repo.
-        #
-        #max_avatar_size: 10M
-
-        # Allow mimetypes for a user avatar. If not defined, no restriction will
-        # be imposed.
-        #
-        # Note that this only applies when an avatar is changed globally.
-        # Per-room avatar changes are not affected. See allow_per_room_profiles
-        # for disabling that functionality.
-        #
-        # Note that user avatar changes will not work if this is set without
-        # using Synapse's local media repo.
-        #
-        #allowed_avatar_mimetypes: ["image/png", "image/jpeg", "image/gif"]
-
         # Maximum number of pixels that will be thumbnailed
         #
         #max_image_pixels: 32M

synapse/config/server.py

@@ -488,6 +488,19 @@ def read_config(self, config, **kwargs):
         # events with profile information that differ from the target's global profile.
         self.allow_per_room_profiles = config.get("allow_per_room_profiles", True)
 
+        # The maximum size an avatar can have, in bytes.
+        self.max_avatar_size = config.get("max_avatar_size")
+        if self.max_avatar_size is not None:
+            self.max_avatar_size = self.parse_size(self.max_avatar_size)
+
+        # The MIME types allowed for an avatar.
+        self.allowed_avatar_mimetypes = config.get("allowed_avatar_mimetypes")
+        if self.allowed_avatar_mimetypes and not isinstance(
+            self.allowed_avatar_mimetypes,
+            list,
+        ):
+            raise ConfigError("allowed_avatar_mimetypes must be a list")
+
         # Whether to show the users on this homeserver in the user directory. Defaults to
         # True.
         self.show_users_in_user_directory = config.get(
@@ -1177,68 +1190,19 @@ def generate_config_section(
         #
         #show_users_in_user_directory: false
 
-        # Message retention policy at the server level.
+        # The largest allowed file size for a user avatar. Defaults to no restriction.
         #
-        # Room admins and mods can define a retention period for their rooms using the
-        # 'm.room.retention' state event, and server admins can cap this period by setting
-        # the 'allowed_lifetime_min' and 'allowed_lifetime_max' config options.
+        # Note that user avatar changes will not work if this is set without
+        # using Synapse's media repository.
         #
-        # If this feature is enabled, Synapse will regularly look for and purge events
-        # which are older than the room's maximum retention period. Synapse will also
-        # filter events received over federation so that events that should have been
-        # purged are ignored and not stored again.
-        #
-        retention:
-          # The message retention policies feature is disabled by default. Uncomment the
-          # following line to enable it.
-          #
-          #enabled: true
-
-          # Default retention policy. If set, Synapse will apply it to rooms that lack the
-          # 'm.room.retention' state event. Currently, the value of 'min_lifetime' doesn't
-          # matter much because Synapse doesn't take it into account yet.
-          #
-          #default_policy:
-          #  min_lifetime: 1d
-          #  max_lifetime: 1y
-
-          # Retention policy limits. If set, a user won't be able to send a
-          # 'm.room.retention' event which features a 'min_lifetime' or a 'max_lifetime'
-          # that's not within this range. This is especially useful in closed federations,
-          # in which server admins can make sure every federating server applies the same
-          # rules.
-          #
-          #allowed_lifetime_min: 1d
-          #allowed_lifetime_max: 1y
+        #max_avatar_size: 10M
 
-          # Server admins can define the settings of the background jobs purging the
-          # events which lifetime has expired under the 'purge_jobs' section.
-          #
-          # If no configuration is provided, a single job will be set up to delete expired
-          # events in every room daily.
-          #
-          # Each job's configuration defines which range of message lifetimes the job
-          # takes care of. For example, if 'shortest_max_lifetime' is '2d' and
-          # 'longest_max_lifetime' is '3d', the job will handle purging expired events in
-          # rooms whose state defines a 'max_lifetime' that's both higher than 2 days, and
-          # lower than or equal to 3 days. Both the minimum and the maximum value of a
-          # range are optional, e.g. a job with no 'shortest_max_lifetime' and a
-          # 'longest_max_lifetime' of '3d' will handle every room with a retention policy
-          # which 'max_lifetime' is lower than or equal to three days.
-          #
-          # The rationale for this per-job configuration is that some rooms might have a
-          # retention policy with a low 'max_lifetime', where history needs to be purged
-          # of outdated messages on a very frequent basis (e.g. every 5min), but not want
-          # that purge to be performed by a job that's iterating over every room it knows,
-          # which would be quite heavy on the server.
-          #
-          #purge_jobs:
-          #  - shortest_max_lifetime: 1d
-          #    longest_max_lifetime: 3d
-          #    interval: 5m:
-          #  - shortest_max_lifetime: 3d
-          #    longest_max_lifetime: 1y
-          #    interval: 24h
+        # The MIME types allowed for user avatars. Defaults to no restriction.
+        #
+        # Note that user avatar changes will not work if this is set without
+        # using Synapse's media repository.
+        #
+        #allowed_avatar_mimetypes: ["image/png", "image/jpeg", "image/gif"]
 
         # How long to keep redacted events in unredacted form in the database. After
         # this period redacted events get replaced with their redacted form in the DB.