/**
 * S3 Uploader - Handles uploading audio files to S3 using pre-signed URLs
 */
import { Buffer } from 'buffer';
/**
 * Upload progress callback
 */
export type UploadProgressCallback = (progress: number) => void;
/**
 * Upload options
 */
export interface UploadOptions {
    /** Content type (default: audio/opus) */
    contentType?: string;
    /** Progress callback */
    onProgress?: UploadProgressCallback;
    /** Abort signal for cancellation */
    abortSignal?: AbortSignal;
}
/**
 * S3 Uploader class
 */
export declare class S3Uploader {
    /**
     * Upload a file to S3 using a pre-signed URL
     */
    upload(data: Buffer, uploadUrl: string, options?: UploadOptions): Promise<void>;
    /**
     * P10: Upload a BLE-e2e ciphertext blob via the backend relay endpoint.
     *
     * Used on the BLE sync path when the device encrypted audio chunks for the
     * project's X25519 backend pubkey before transferring. The SDK never holds
     * plaintext — the bytes received from the device are opaque ciphertext,
     * POSTed here for server-side decryption + S3 write.
     *
     * The endpoint is `POST /v1/recordings/{id}/upload-relay` and expects
     * `Content-Type: application/octet-stream`. Auth is a standard Bearer
     * token (project secret/restricted key, or a device token).
     */
    relayUpload(ciphertext: Buffer, relayUrl: string, bearerToken: string, options?: UploadOptions): Promise<void>;
    /**
     * Upload a file in chunks (for larger files)
     * Note: This requires multipart upload support from the pre-signed URL
     */
    uploadChunked(data: Buffer, uploadUrl: string, options?: UploadOptions): Promise<void>;
    /**
     * Notify the backend that upload is complete
     */
    notifyCompletion(completeUrl: string, recordingId: string, uploadToken: string, contentSha256?: string): Promise<void>;
}
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