fix: certificate output when reading certificate from stdin or file (#9)

* remove character device checker
* fix certificate info output

Author: nothinux

.gitignore

@@ -0,0 +1 @@
+*.pem

certify

@@ -147,22 +147,24 @@ func CertInfo(cert *x509.Certificate) string {
 	}
 
 	buf.WriteString(fmt.Sprintf("%8sX509v3 extensions:\n", ""))
-	buf.WriteString(fmt.Sprintf("%12sX509v3 Extended Key Usage:\n", ""))
-	buf.WriteString(fmt.Sprintf("%16s%v\n", "", parseExtKeyUsage(cert.ExtKeyUsage)))
-	buf.WriteString(fmt.Sprintf("%8sX509v3 Basic Constraints:\n", ""))
-	buf.WriteString(fmt.Sprintf("%12sCA: %v\n", "", cert.IsCA))
+	if len(parseExtKeyUsage(cert.ExtKeyUsage)) != 0 {
+		buf.WriteString(fmt.Sprintf("%12sX509v3 Extended Key Usage:\n", ""))
+		buf.WriteString(fmt.Sprintf("%16s%v\n", "", parseExtKeyUsage(cert.ExtKeyUsage)))
+	}
+	buf.WriteString(fmt.Sprintf("%12sX509v3 Basic Constraints:\n", ""))
+	buf.WriteString(fmt.Sprintf("%16sCA: %v\n", "", cert.IsCA))
 
 	if len(cert.IPAddresses) != 0 || len(cert.DNSNames) != 0 {
-		buf.WriteString(fmt.Sprintf("%8sX509v3 Subject Alternative Name:\n", ""))
+		buf.WriteString(fmt.Sprintf("%12sX509v3 Subject Alternative Name:\n", ""))
 		if len(cert.IPAddresses) != 0 {
 			var ips []string
 			for _, ip := range cert.IPAddresses {
 				ips = append(ips, ip.String())
 			}
-			buf.WriteString(fmt.Sprintf("%12sIP Address: %v\n", "", strings.Join(ips, ", ")))
+			buf.WriteString(fmt.Sprintf("%16sIP Address: %v\n", "", strings.Join(ips, ", ")))
 		}
 		if len(cert.DNSNames) != 0 {
-			buf.WriteString(fmt.Sprintf("%12sDNS: %v\n", "", strings.Join(cert.DNSNames, ", ")))
+			buf.WriteString(fmt.Sprintf("%16sDNS: %v\n", "", strings.Join(cert.DNSNames, ", ")))
 		}
 	}
 

certify.go

@@ -30,10 +30,6 @@ func readCertificate(args []string, stdin *os.File) (string, error) {
 	var err error
 
 	if len(args) < 3 {
-		if err := isPipe(stdin); err != nil {
-			return "", err
-		}
-
 		certByte, err = io.ReadAll(stdin)
 		if err != nil {
 			return "", err

cmd/certify/command.go

@@ -428,19 +428,6 @@ func isExist(path string) bool {
 	return !errors.Is(err, os.ErrNotExist)
 }
 
-func isPipe(stdin *os.File) error {
-	info, err := stdin.Stat()
-	if err != nil {
-		return err
-	}
-
-	if info.Mode()&os.ModeCharDevice != 0 || info.Size() != 0 {
-		return errors.New("can't read certificate, please provide certificate path or certificate content from stdin")
-	}
-
-	return nil
-}
-
 func parseTLSVersion(args []string) *tls.Config {
 	for _, arg := range args[1:] {
 		if strings.Contains(arg, "tlsver:") {