Zoraxy/mod/certvalidate/certvalidate.go

package certvalidate

import (
	"crypto/x509"
	"encoding/pem"
	"io"
	"mime/multipart"
	"strings"
)

func isValidTLSFile(file multipart.File) bool {
	// Read the contents of the uploaded file
	contents, err := io.ReadAll(file)
	if err != nil {
		// Handle the error
		return false
	}

	// Parse the contents of the file as a PEM-encoded certificate or key
	block, _ := pem.Decode(contents)
	if block == nil {
		// The file is not a valid PEM-encoded certificate or key
		return false
	}

	// Parse the certificate or key
	if strings.Contains(block.Type, "CERTIFICATE") {
		// The file contains a certificate
		cert, err := x509.ParseCertificate(block.Bytes)
		if err != nil {
			// Handle the error
			return false
		}
		// Check if the certificate is a valid TLS/SSL certificate
		return cert.IsCA == false && cert.KeyUsage&x509.KeyUsageDigitalSignature != 0 && cert.KeyUsage&x509.KeyUsageKeyEncipherment != 0
	} else if strings.Contains(block.Type, "PRIVATE KEY") {
		// The file contains a private key
		_, err := x509.ParsePKCS1PrivateKey(block.Bytes)
		if err != nil {
			// Handle the error
			return false
		}
		return true
	} else {
		return false
	}

}