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main.go
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main.go
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package main
import (
"crypto/x509"
"encoding/pem"
"flag"
"fmt"
"os"
"path/filepath"
"github.com/esachser/obbsubjectextractor"
)
func main() {
flag.Usage = func() {
cmdName := filepath.Base(os.Args[0])
fmt.Printf("Usage:\n%s <path-of-pem>\n", cmdName)
flag.PrintDefaults()
}
flag.Parse()
if flag.NArg() < 1 {
flag.Usage()
os.Exit(1)
}
filename := flag.Arg(0)
pemFile, err := os.ReadFile(filename)
if err != nil {
fmt.Printf("Error reading file %s: %v", filename, err)
os.Exit(1)
}
pemBlock, _ := pem.Decode(pemFile)
cert, err := x509.ParseCertificate(pemBlock.Bytes)
if err != nil {
fmt.Printf("Error parsing certificate: %v", err)
os.Exit(1)
}
subjectDN, err := obbsubjectextractor.ExtractSubject(cert)
if err != nil {
fmt.Printf("Error parsing subject DN: %v", err)
os.Exit(1)
}
fmt.Println(subjectDN)
}