import { OnModuleInit } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { StorageProvider } from '../entities/file.entity';
export interface PresignedUrlOptions {
    bucket: string;
    key: string;
    contentType: string;
    contentLength: number;
    expiresIn?: number;
    metadata?: Record<string, string>;
}
export interface PresignedUrlResult {
    url: string;
    expiresAt: Date;
}
export declare class S3Provider implements OnModuleInit {
    private configService;
    private readonly logger;
    private client;
    private bucket;
    private provider;
    private configured;
    constructor(configService: ConfigService);
    onModuleInit(): void;
    isConfigured(): boolean;
    getBucket(): string;
    getProvider(): StorageProvider;
    getUploadUrl(options: PresignedUrlOptions): Promise<PresignedUrlResult>;
    getDownloadUrl(key: string, expiresIn?: number): Promise<PresignedUrlResult>;
    deleteObject(key: string): Promise<void>;
    headObject(key: string): Promise<{
        contentLength: number;
        contentType: string;
    } | null>;
    generatePath(tenantId: string, folder: string, uploadId: string, filename: string): string;
}