import { VoidUploadResult } from "./index";
import { AuthHandler } from "./api";
/**
 * Generic upload state
 */
export declare enum UploadState {
    NotStarted = 0,
    Starting = 1,
    Hashing = 2,
    Uploading = 3,
    Done = 4,
    Failed = 5,
    Challenge = 6
}
export type StateChangeHandler = (s: UploadState) => void;
export type ProgressHandler = (loaded: number) => void;
export type ProxyChallengeHandler = (html: string) => void;
/**
 * Base file uploader class
 */
export declare abstract class VoidUploader {
    protected uri: string;
    protected file: File | Blob;
    protected auth?: AuthHandler;
    protected maxChunkSize: number;
    protected onStateChange?: StateChangeHandler;
    protected onProgress?: ProgressHandler;
    protected onProxyChallenge?: ProxyChallengeHandler;
    constructor(uri: string, file: File | Blob, stateChange?: StateChangeHandler, progress?: ProgressHandler, proxyChallenge?: ProxyChallengeHandler, auth?: AuthHandler, chunkSize?: number);
    /**
     * SHA-256 hash the entire blob
     * @param file
     * @protected
     */
    protected digest(file: Blob): Promise<string>;
    /**
     * Upload a file to the API
     * @param headers any additional headers to send with the request
     */
    abstract upload(headers?: HeadersInit): Promise<VoidUploadResult>;
    /**
     * Can we use local encryption
     */
    abstract canEncrypt(): boolean;
    /**
     * Enable/Disable encryption, file will be encrypted on the fly locally before uploading
     */
    abstract setEncryption(s: boolean): void;
    /**
     * Get the encryption key, should be called after enableEncryption()
     */
    abstract getEncryptionKey(): string | undefined;
}
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