fix: api descript

app/objectstory/rpc/internal/logic/getFileUrlLogic.go

@@ -2,10 +2,13 @@ package logic
 
 import (
 	"context"
+	"errors"
+	"time"
 
 	"juwan-backend/app/objectstory/rpc/internal/svc"
 	"juwan-backend/app/objectstory/rpc/pb"
 
+	"github.com/aws/aws-sdk-go-v2/service/s3"
 	"github.com/zeromicro/go-zero/core/logx"
 )
 
@@ -25,7 +28,26 @@ func NewGetFileUrlLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetFil
 
 // 获取文件访问链接（处理私有文件的鉴权）
 func (l *GetFileUrlLogic) GetFileUrl(in *pb.GetFileUrlReq) (*pb.GetFileUrlResp, error) {
-	// todo: add your logic here and delete this line
+	if in == nil || in.GetFileId() == "" {
+		return nil, errors.New("file id is required")
+	}
 
-	return &pb.GetFileUrlResp{}, nil
+	_, err := l.svcCtx.S3.HeadObject(l.ctx, &s3.HeadObjectInput{
+		Bucket: &l.svcCtx.Config.S3Conf.Bucket,
+		Key:    &in.FileId,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	presignClient := s3.NewPresignClient(l.svcCtx.S3)
+	presigned, err := presignClient.PresignGetObject(l.ctx, &s3.GetObjectInput{
+		Bucket: &l.svcCtx.Config.S3Conf.Bucket,
+		Key:    &in.FileId,
+	}, s3.WithPresignExpires(15*time.Minute))
+	if err != nil {
+		return nil, err
+	}
+
+	return &pb.GetFileUrlResp{Url: presigned.URL}, nil
 }