smartproxy/ts/certificate/acme/challenge-handler.ts

import * as plugins from '../../plugins.js';
import type { AcmeOptions, CertificateData } from '../models/certificate-types.js';
import { CertificateEvents } from '../events/certificate-events.js';

/**
 * Manages ACME challenges and certificate validation
 */
export class AcmeChallengeHandler extends plugins.EventEmitter {
  private options: AcmeOptions;
  private client: any; // ACME client from plugins
  private pendingChallenges: Map<string, any>;

  /**
   * Creates a new ACME challenge handler
   * @param options ACME configuration options
   */
  constructor(options: AcmeOptions) {
    super();
    this.options = options;
    this.pendingChallenges = new Map();

    // Initialize ACME client if needed
    // This is just a placeholder implementation since we don't use the actual
    // client directly in this implementation - it's handled by Port80Handler
    this.client = null;
    console.log('Created challenge handler with options:',
      options.accountEmail,
      options.useProduction ? 'production' : 'staging'
    );
  }

  /**
   * Gets or creates the ACME account key
   */
  private getAccountKey(): Buffer {
    // Implementation details would depend on plugin requirements
    // This is a simplified version
    if (!this.options.certificateStore) {
      throw new Error('Certificate store is required for ACME challenges');
    }
    
    // This is just a placeholder - actual implementation would check for
    // existing account key and create one if needed
    return Buffer.from('account-key-placeholder');
  }

  /**
   * Validates a domain using HTTP-01 challenge
   * @param domain Domain to validate
   * @param challengeToken ACME challenge token
   * @param keyAuthorization Key authorization for the challenge
   */
  public async handleHttpChallenge(
    domain: string,
    challengeToken: string,
    keyAuthorization: string
  ): Promise<void> {
    // Store challenge for response
    this.pendingChallenges.set(challengeToken, keyAuthorization);
    
    try {
      // Wait for challenge validation - this would normally be handled by the ACME client
      await new Promise(resolve => setTimeout(resolve, 1000));
      this.emit(CertificateEvents.CERTIFICATE_ISSUED, {
        domain,
        success: true
      });
    } catch (error) {
      this.emit(CertificateEvents.CERTIFICATE_FAILED, {
        domain,
        error: error instanceof Error ? error.message : String(error),
        isRenewal: false
      });
      throw error;
    } finally {
      // Clean up the challenge
      this.pendingChallenges.delete(challengeToken);
    }
  }

  /**
   * Responds to an HTTP-01 challenge request
   * @param token Challenge token from the request path
   * @returns The key authorization if found
   */
  public getChallengeResponse(token: string): string | null {
    return this.pendingChallenges.get(token) || null;
  }

  /**
   * Checks if a request path is an ACME challenge
   * @param path Request path
   * @returns True if this is an ACME challenge request
   */
  public isAcmeChallenge(path: string): boolean {
    return path.startsWith('/.well-known/acme-challenge/');
  }

  /**
   * Extracts the challenge token from an ACME challenge path
   * @param path Request path
   * @returns The challenge token if valid
   */
  public extractChallengeToken(path: string): string | null {
    if (!this.isAcmeChallenge(path)) return null;
    
    const parts = path.split('/');
    return parts[parts.length - 1] || null;
  }
}