fix: emit channel avatar service messages

internal/domain/channel.go

@@ -509,11 +509,13 @@ type ChannelDialog struct {
 type ChannelMessageActionType string
 
 const (
-	ChannelActionNone        ChannelMessageActionType = ""
-	ChannelActionCreate      ChannelMessageActionType = "channel_create"
-	ChannelActionChatAddUser ChannelMessageActionType = "chat_add_user"
-	ChannelActionChatDelete  ChannelMessageActionType = "chat_delete_user"
-	ChannelActionChatJoined  ChannelMessageActionType = "chat_joined"
+	ChannelActionNone            ChannelMessageActionType = ""
+	ChannelActionCreate          ChannelMessageActionType = "channel_create"
+	ChannelActionChatAddUser     ChannelMessageActionType = "chat_add_user"
+	ChannelActionChatDelete      ChannelMessageActionType = "chat_delete_user"
+	ChannelActionChatEditPhoto   ChannelMessageActionType = "chat_edit_photo"
+	ChannelActionChatDeletePhoto ChannelMessageActionType = "chat_delete_photo"
+	ChannelActionChatJoined      ChannelMessageActionType = "chat_joined"
 	// ChannelActionChatJoinedByLink 是经邀请链接加入的服务消息，
 	// 渲染为 "X joined the group via invite link"。
 	ChannelActionChatJoinedByLink ChannelMessageActionType = "chat_joined_by_link"
@@ -572,6 +574,8 @@ type ChannelMessageAction struct {
 	StarGift *MessageStarGiftAction
 	// Wallpaper 仅 set_chat_wallpaper 服务消息使用。
 	Wallpaper *Wallpaper
+	// Photo 仅 chat_edit_photo 服务消息使用。
+	Photo *Photo
 }
 
 // ChannelMessage is a single stored message in a channel/supergroup.
@@ -1341,6 +1345,16 @@ type UpdateChannelUsernameRequest struct {
 	Username  string
 }
 
+// SetChannelPhotoResult describes a channel avatar mutation and its durable
+// service message.
+type SetChannelPhotoResult struct {
+	Channel    Channel
+	Message    ChannelMessage
+	Event      ChannelUpdateEvent
+	Recipients []int64
+	Changed    bool
+}
+
 // DeleteChannelResult describes a deleted channel.
 type DeleteChannelResult struct {
 	Channel    Channel

internal/domain/media.go

@@ -349,6 +349,21 @@ type Photo struct {
 	Sizes         []PhotoSize `json:"sizes,omitempty"`
 }
 
+func ClonePhotoPtr(photo *Photo) *Photo {
+	if photo == nil {
+		return nil
+	}
+	clone := *photo
+	clone.FileReference = append([]byte(nil), photo.FileReference...)
+	clone.Sizes = append([]PhotoSize(nil), photo.Sizes...)
+	for i := range clone.Sizes {
+		clone.Sizes[i].Bytes = append([]byte(nil), photo.Sizes[i].Bytes...)
+		clone.Sizes[i].Sizes = append([]int(nil), photo.Sizes[i].Sizes...)
+		clone.Sizes[i].BackgroundColors = append([]int(nil), photo.Sizes[i].BackgroundColors...)
+	}
+	return &clone
+}
+
 // MessageMediaKind 枚举消息可挂载的媒体载荷。
 type MessageMediaKind string