TrustPinDioInterceptor class

A certificate pinning interceptor for the Dio HTTP client.

This interceptor adds TrustPin certificate validation to all HTTPS requests made through Dio. It validates certificates in two phases:

1. Standard TLS validation (handled by the OS)
2. TrustPin certificate pinning validation

Certificates are cached to avoid repeated socket connections to the same host. The cache stores certificates but not validation results, so TrustPin verification is performed on every request.

Usage

final dio = Dio();
dio.interceptors.add(TrustPinDioInterceptor());

// Now all HTTPS requests will have certificate pinning
final response = await dio.get('https://api.example.com/data');

Important Notes

• TrustPin must be initialized with TrustPin.setup before using this interceptor
• Only HTTPS requests are validated; HTTP requests pass through unchanged
• Certificate validation happens before the actual HTTP request is sent
• Failed validation prevents the request from being sent