A certificate pool in Go to verify server certificates from clients

cert_pool.go

func getCertPool(fileName string) *x509.CertPool {
	// Load the server certificate from a file
	certBytes, err := os.ReadFile(fileName)
	if err != nil {
		fmt.Println("Error reading certificate file:", err)
		return nil
	}

	// Decode the PEM-encoded certificate
	pemBlock, _ := pem.Decode(certBytes)
	if pemBlock == nil {
		fmt.Println("Failed to decode PEM block")
		return nil
	}

	// Parse the certificate data
	cert, err := x509.ParseCertificate(pemBlock.Bytes)
	if err != nil {
		fmt.Println("Error parsing certificate:", err)
		return nil
	}

	// Create a certificate pool and add the server certificate to it
	pool := x509.NewCertPool()
	pool.AddCert(cert)

	return pool
}