config: add member list and max member count options

Signed-off-by: Sumner Evans <sumner.evans@automattic.com>

pkg/connector/config.go

@@ -21,6 +21,14 @@ type TelegramConfig struct {
 	SetPrivateChatPortalMeta bool `yaml:"set_private_chat_portal_meta"`
 
 	AnimatedSticker media.AnimatedStickerConfig `yaml:"animated_sticker"`
+
+	MemberList struct {
+		MaxInitialSync int  `yaml:"max_initial_sync"`
+		SyncChannels   bool `yaml:"sync_channels"`
+		SkipDeleted    bool `yaml:"skip_deleted"`
+	} `yaml:"member_list"`
+
+	MaxMemberCount int `yaml:"max_member_count"`
 }
 
 //go:embed example-config.yaml
@@ -35,6 +43,10 @@ func upgradeConfig(helper up.Helper) {
 	helper.Copy(up.Int, "animated_sticker", "args", "width")
 	helper.Copy(up.Int, "animated_sticker", "args", "height")
 	helper.Copy(up.Int, "animated_sticker", "args", "fps")
+	helper.Copy(up.Int, "member_list", "max_initial_sync")
+	helper.Copy(up.Bool, "member_list", "sync_channels")
+	helper.Copy(up.Bool, "member_list", "skip_deleted")
+	helper.Copy(up.Int, "max_member_count")
 }
 
 func (tg *TelegramConnector) GetConfig() (example string, data any, upgrader up.Upgrader) {

pkg/connector/example-config.yaml

@@ -25,3 +25,29 @@ animated_sticker:
         width: 256
         height: 256
         fps: 25 # only for webm, webp and gif (2, 5, 10, 20 or 25 recommended)
+
+# Settings for syncing the member list for portals.
+member_list:
+    # Maximum number of members to sync per portal when starting up. Other
+    # members will be synced when they send messages. The maximum is 10000,
+    # after which the Telegram server will not send any more members.
+    #
+    # -1 means no limit (which means it's limited to 10000 by the server)
+    max_initial_sync: 100
+
+    # Whether or not to sync the member list in channels. If disabled, members
+    # will still be synced when they send messages.
+    #
+    # If no channel admins have logged into the bridge, the bridge won't be
+    # able to sync the member list regardless of this setting.
+    sync_channels: false
+
+    # Whether or not to skip deleted members when syncing members.
+    skip_deleted: true
+
+# Maximum number of participants in chats to bridge. Only applies when the
+# portal is being created. If there are more members when trying to create a
+# room, the room creation will be cancelled.
+#
+# -1 means no limit (which means all chats can be bridged)
+max_member_count: -1