feat: add public media copy

bot/handle_link.go

@@ -1,6 +1,7 @@
 package bot
 
 import (
+	"fmt"
 	"regexp"
 	"strconv"
 	"strings"
@@ -18,47 +19,47 @@ var (
 	linkRegex       = regexp.MustCompile(linkRegexString)
 )
 
+func parseLink(ctx *ext.Context, link string) (chatID int64, messageID int, err error) {
+	strSlice := strings.Split(link, "/")
+	if len(strSlice) < 3 {
+		return 0, 0, fmt.Errorf("链接格式错误: %s", link)
+	}
+	messageID, err = strconv.Atoi(strSlice[len(strSlice)-1])
+	if err != nil {
+		return 0, 0, fmt.Errorf("无法解析消息 ID: %s", err)
+	}
+	if len(strSlice) == 3 {
+		chatUsername := strSlice[1]
+		linkChat, err := ctx.ResolveUsername(chatUsername)
+		if err != nil {
+			return 0, 0, fmt.Errorf("解析用户名失败: %s", err)
+		}
+		if linkChat == nil {
+			return 0, 0, fmt.Errorf("找不到该聊天: %s", chatUsername)
+		}
+		chatID = linkChat.GetID()
+	} else if len(strSlice) == 4 {
+		chatIDInt, err := strconv.Atoi(strSlice[2])
+		if err != nil {
+			return 0, 0, fmt.Errorf("无法解析 Chat ID: %s", err)
+		}
+		chatID = int64(chatIDInt)
+	} else {
+		return 0, 0, fmt.Errorf("无效的链接: %s", link)
+	}
+	return chatID, messageID, nil
+}
+
 func handleLinkMessage(ctx *ext.Context, update *ext.Update) error {
 	common.Log.Trace("Got link message")
 	link := linkRegex.FindString(update.EffectiveMessage.Text)
 	if link == "" {
 		return dispatcher.ContinueGroups
 	}
-	strSlice := strings.Split(link, "/")
-	if len(strSlice) < 3 {
-		return dispatcher.ContinueGroups
-	}
-	messageID, err := strconv.Atoi(strSlice[len(strSlice)-1])
+	linkChatID, messageID, err := parseLink(ctx, link)
 	if err != nil {
-		common.Log.Errorf("解析消息 ID 失败: %s", err)
-		ctx.Reply(update, ext.ReplyTextString("无法解析消息 ID"), nil)
-		return dispatcher.EndGroups
-	}
-	var linkChatID int64
-	if len(strSlice) == 3 {
-		chatUsername := strSlice[1]
-		linkChat, err := ctx.ResolveUsername(chatUsername)
-		if err != nil {
-			common.Log.Errorf("解析用户名失败: %s", err)
-			ctx.Reply(update, ext.ReplyTextString("解析用户名失败"), nil)
-			return dispatcher.EndGroups
-		}
-		if linkChat == nil {
-			common.Log.Errorf("无法找到聊天: %s", chatUsername)
-			ctx.Reply(update, ext.ReplyTextString("无法找到聊天"), nil)
-			return dispatcher.EndGroups
-		}
-		linkChatID = linkChat.GetID()
-	} else if len(strSlice) == 4 {
-		chatID, err := strconv.Atoi(strSlice[2])
-		if err != nil {
-			common.Log.Errorf("解析 Chat ID 失败: %s", err)
-			ctx.Reply(update, ext.ReplyTextString("解析 Chat ID 失败"), nil)
-			return dispatcher.EndGroups
-		}
-		linkChatID = int64(chatID)
-	} else {
-		ctx.Reply(update, ext.ReplyTextString("无法解析链接"), nil)
+		common.Log.Errorf("解析链接失败: %s", err)
+		ctx.Reply(update, ext.ReplyTextString("解析链接失败: "+err.Error()), nil)
 		return dispatcher.EndGroups
 	}
 

bot/middlewares.go

@@ -9,6 +9,7 @@ import (
 	"github.com/gotd/contrib/middleware/floodwait"
 	"github.com/gotd/contrib/middleware/ratelimit"
 	"github.com/gotd/td/telegram"
+	"github.com/krau/SaveAny-Bot/common"
 	"github.com/krau/SaveAny-Bot/config"
 	"golang.org/x/time/rate"
 )
@@ -30,8 +31,38 @@ const noPermissionText string = `
 func checkPermission(ctx *ext.Context, update *ext.Update) error {
 	userID := update.GetUserChat().GetID()
 	if !slice.Contain(config.Cfg.GetUsersID(), userID) {
+		if config.Cfg.AsPublicCopyMediaBot {
+			tryCopyMedia(ctx, update)
+			return dispatcher.EndGroups
+		}
 		ctx.Reply(update, ext.ReplyTextString(noPermissionText), nil)
 		return dispatcher.EndGroups
 	}
 	return dispatcher.ContinueGroups
 }
+
+func tryCopyMedia(ctx *ext.Context, update *ext.Update) {
+	if !config.Cfg.AsPublicCopyMediaBot {
+		return
+	}
+	if update.EffectiveMessage == nil || update.EffectiveMessage.Message == nil || update.EffectiveMessage.Media == nil {
+		return
+	}
+	common.Log.Tracef("Got media from %d: %s", update.EffectiveChat().GetID(), update.EffectiveMessage.Media.TypeName())
+	msg := update.EffectiveMessage.Message
+	if link := linkRegex.FindString(update.EffectiveMessage.Text); link != "" {
+		linkChatID, messageID, err := parseLink(ctx, link)
+		if err != nil {
+			return
+		}
+		fileMessage, err := GetTGMessage(ctx, linkChatID, messageID)
+		if err != nil {
+			return
+		}
+		if fileMessage == nil || fileMessage.Media == nil {
+			return
+		}
+		msg = fileMessage
+	}
+	copyMediaToChat(ctx, msg, update.EffectiveChat().GetID())
+}

bot/utils.go

@@ -216,7 +216,7 @@ func GetTGMessage(ctx *ext.Context, chatId int64, messageID int) (*tg.Message, e
 	if err == nil {
 		return cacheMessage, nil
 	}
-	common.Log.Debugf("Fetching message: %d", messageID)
+	common.Log.Debugf("Fetching message: %d:%d", chatId, messageID)
 	messages, err := ctx.GetMessages(chatId, []tg.InputMessageClass{&tg.InputMessageID{ID: messageID}})
 	if err != nil {
 		return nil, err

config/viper.go

@@ -17,6 +17,9 @@ type Config struct {
 	Threads      int  `toml:"threads" mapstructure:"threads" json:"threads"`
 	Stream       bool `toml:"stream" mapstructure:"stream" json:"stream"`
 
+	// Experimental: 将拷贝媒体文件的功能设为公开可用
+	AsPublicCopyMediaBot bool `toml:"as_public_copy_media_bot" mapstructure:"as_public_copy_media_bot" json:"as_public_copy_media_bot"`
+
 	Users []userConfig `toml:"users" mapstructure:"users" json:"users"`
 
 	Temp     tempConfig              `toml:"temp" mapstructure:"temp"`