import type { NotificationPayload, NotificationRecipient } from '../../notifications.types.js';
import type { NotificationChannel } from '../channel.interface.js';
import { ChannelType, type ChannelContent, type ChannelSendResult, type ChannelHealth, type WebhookContent } from '../channel.interface.js';
export interface WebhookChannelOptions {
    timeout?: number;
    retries?: number;
    retryDelay?: number;
    headers?: Record<string, string>;
    signatureSecret?: string;
    signatureHeader?: string;
    signatureAlgorithm?: 'sha1' | 'sha256' | 'sha512';
    includeTimestamp?: boolean;
    timestampHeader?: string;
    validateSSL?: boolean;
    userAgent?: string;
}
export declare class WebhookChannel implements NotificationChannel {
    readonly name = "webhook";
    readonly type = ChannelType.Webhook;
    private readonly options;
    private healthCheckUrl?;
    constructor(options?: WebhookChannelOptions);
    configure(options: WebhookChannelOptions): void;
    setHealthCheckUrl(url: string): void;
    initialize(): Promise<void>;
    shutdown(): Promise<void>;
    isAvailable(): Promise<boolean>;
    healthCheck(): Promise<ChannelHealth>;
    validateRecipient(recipient: NotificationRecipient): boolean;
    formatContent(notification: NotificationPayload): WebhookContent;
    send(recipient: NotificationRecipient, content: ChannelContent): Promise<ChannelSendResult>;
    private sendRequest;
    private buildHeaders;
    private generateSignature;
    private isValidUrl;
    private delay;
}
export declare function verifyWebhookSignature(body: string, signature: string, secret: string, algorithm?: 'sha1' | 'sha256' | 'sha512'): boolean;
//# sourceMappingURL=webhook.channel.d.ts.map