import { CallHandler, ExecutionContext, NestInterceptor } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { Observable } from 'rxjs';
import { IFileProcessor } from '../interfaces/file-processor.interface';
import { FileService } from '../services/file.service';
import { FileSignatureValidator } from '../services/file-signature-validator.service';
import { MaliciousFileDetector } from '../services/malicious-file-detector.service';
import { MimeRegistryService } from '../services/mime-registry.service';
/**
 * 文件上传拦截器（优化版）
 * 负责创建文件记录、执行钩子、处理器等后置逻辑
 */
export declare class FileUploadInterceptor implements NestInterceptor {
    private readonly reflector;
    private readonly mimeRegistry;
    private readonly processors?;
    private readonly fileService?;
    private readonly signatureValidator?;
    private readonly maliciousDetector?;
    private readonly moduleOptions?;
    private readonly logger;
    constructor(reflector: Reflector, mimeRegistry: MimeRegistryService, processors?: Map<string, IFileProcessor>, fileService?: FileService, signatureValidator?: FileSignatureValidator, maliciousDetector?: MaliciousFileDetector, moduleOptions?: any);
    intercept(context: ExecutionContext, next: CallHandler): Promise<Observable<any>>;
    /**
     * 判断是否应该跳过验证
     */
    private shouldSkipValidation;
    /**
     * 验证文件
     */
    private validateFile;
    /**
     * 批量验证文件类型和扩展名
     */
    private validateFileTypeAndExtension;
    /**
     * 判断是否需要执行文件签名验证
     */
    private shouldPerformSignatureValidation;
    /**
     * 验证文件签名
     */
    private validateFileSignature;
    /**
     * 判断是否需要执行恶意文件检测
     */
    private shouldPerformMaliciousCheck;
    /**
     * 检测恶意文件
     */
    private checkMaliciousFile;
    /**
     * 处理文件
     */
    private processFile;
    /**
     * 创建文件实体
     */
    private createFileEntity;
    /**
     * 执行处理器
     */
    private executeProcessors;
    /**
     * 转换为 FileEntity
     */
    private convertToFileEntity;
    /**
     * 更新成功状态
     */
    private updateFileEntityOnSuccess;
    /**
     * 清理失败的文件
     */
    private cleanupOnFailure;
    /**
     * 创建上传上下文
     */
    private createUploadContext;
    /**
     * 获取处理器
     */
    private getProcessor;
    /**
     * 生成uploadId
     */
    private generateUploadId;
    /**
     * 判断是否应该在处理后删除原文件
     */
    private shouldDeleteAfterProcess;
    /**
     * 将处理器结果保存到 file_metadata 表
     * 处理器可以通过返回结果中的 metadata 字段来指定要保存的内容
     */
    private saveProcessorResultToMetadata;
    /**
     * 删除原文件
     */
    private deleteOriginalFile;
}