Add -cert-file, -key-file and -p12-file (#77)

cert.go

@@ -12,6 +12,7 @@ import (
 	"crypto/x509/pkix"
 	"encoding/asn1"
 	"encoding/pem"
+	"errors"
 	"io/ioutil"
 	"log"
 	"math/big"
@@ -39,6 +40,34 @@ func init() {
 	userAndHostname += strings.TrimSpace(string(out))
 }
 
+// getFileName generate file name according to flags
+func (m *mkcert) getFileName(w string, args []string) (name string, err error) {
+	filename := strings.Replace(args[0], ":", "_", -1)
+	filename = strings.Replace(filename, "*", "_wildcard", -1)
+	if len(args) > 1 {
+		filename += "+" + strconv.Itoa(len(args)-1)
+	}
+	switch w {
+	case "key":
+		if m.keyFileFlag != "" {
+			return m.keyFileFlag, nil
+		}
+		return filename + "-key.pem", nil
+	case "cert":
+		if m.certFileFlag != "" {
+			return m.certFileFlag, nil
+		}
+		return filename + ".pem", nil
+	case "p12":
+		if m.p12FileFlag != "" {
+			return m.p12FileFlag, nil
+		}
+		return filename + ".p12", nil
+	default:
+		return "", errors.New("failed to generate file name")
+	}
+}
+
 func (m *mkcert) makeCert(hosts []string) {
 	if m.caKey == nil {
 		log.Fatalln("ERROR: can't create new certificates because the CA key (rootCA-key.pem) is missing")
@@ -76,28 +105,28 @@ func (m *mkcert) makeCert(hosts []string) {
 	pub := priv.PublicKey
 	cert, err := x509.CreateCertificate(rand.Reader, tpl, m.caCert, &pub, m.caKey)
 	fatalIfErr(err, "failed to generate certificate")
-
+	var keyname, certname, p12name string
-	filename := strings.Replace(hosts[0], ":", "_", -1)
-	filename = strings.Replace(filename, "*", "_wildcard", -1)
-	if len(hosts) > 1 {
-		filename += "+" + strconv.Itoa(len(hosts)-1)
-	}
-
 	if !m.pkcs12 {
 		privDER, err := x509.MarshalPKCS8PrivateKey(priv)
 		fatalIfErr(err, "failed to encode certificate key")
-		err = ioutil.WriteFile(filename+"-key.pem", pem.EncodeToMemory(
+		keyname, err = m.getFileName("key", hosts)
+		fatalIfErr(err, "failed to generate key file name")
+		err = ioutil.WriteFile(keyname, pem.EncodeToMemory(
 			&pem.Block{Type: "PRIVATE KEY", Bytes: privDER}), 0600)
 		fatalIfErr(err, "failed to save certificate key")
 
-		err = ioutil.WriteFile(filename+".pem", pem.EncodeToMemory(
+		certname, err = m.getFileName("cert", hosts)
+		fatalIfErr(err, "failed to generate cert file name")
+		err = ioutil.WriteFile(certname, pem.EncodeToMemory(
 			&pem.Block{Type: "CERTIFICATE", Bytes: cert}), 0644)
 		fatalIfErr(err, "failed to save certificate key")
 	} else {
 		domainCert, _ := x509.ParseCertificate(cert)
 		pfxData, err := pkcs12.Encode(rand.Reader, priv, domainCert, []*x509.Certificate{m.caCert}, "changeit")
 		fatalIfErr(err, "failed to generate PKCS#12")
-		err = ioutil.WriteFile(filename+".p12", pfxData, 0644)
+		p12name, err = m.getFileName("p12", hosts)
+		fatalIfErr(err, "failed to generate cert PKCS#12 file name")
+		err = ioutil.WriteFile(p12name, pfxData, 0644)
 		fatalIfErr(err, "failed to save PKCS#12")
 	}
 
@@ -118,9 +147,9 @@ func (m *mkcert) makeCert(hosts []string) {
 	}
 
 	if !m.pkcs12 {
-		log.Printf("\nThe certificate is at \"./%s.pem\" and the key at \"./%s-key.pem\" ✅\n\n", filename, filename)
+		log.Printf("\nThe certificate is at \"./%s\" and the key at \"./%s\" ✅\n\n", certname, keyname)
 	} else {
-		log.Printf("\nThe PKCS#12 bundle is at \"./%s.p12\" ✅\n", filename)
+		log.Printf("\nThe PKCS#12 bundle is at \"./%s\" ✅\n", p12name)
 		log.Printf("\nThe legacy PKCS#12 encryption password is the often hardcoded default \"changeit\" ℹ️\n\n")
 	}
 }

cert_test.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"testing"
+)
+
+// TestGetFileName test func getFileName
+func TestGetFileName(t *testing.T) {
+	// all flags are added
+	mk := &mkcert{
+		keyFileFlag:  "test-key-name.pem",
+		certFileFlag: "test-cert-name.pem",
+		p12FileFlag:  "test.p12",
+	}
+	// check keyname, the result should be customized
+	keyname, err := mk.getFileName("key", []string{"example.com"})
+	if err != nil {
+		t.Error("failed to get customized key file name")
+	}
+	if keyname != "test-key-name.pem" {
+		t.Error("keyname check failed")
+	}
+
+	// check certname, the result should be customized
+	certname, err := mk.getFileName("cert", []string{"example.com"})
+	if err != nil {
+		t.Error("failed to get customized cert file name")
+	}
+	if certname != "test-cert-name.pem" {
+		t.Error("certname check failed")
+	}
+
+	// check p12name, the result should be customized
+	p12name, err := mk.getFileName("p12", []string{"example.com"})
+	if err != nil {
+		t.Error("failed to get customized p12 file name")
+	}
+	if p12name != "test.p12" {
+		t.Error("p12 check failed")
+	}
+
+	// default name will be generated if no flags passed
+	mk = &mkcert{
+		keyFileFlag: "test-key-name.pem",
+	}
+	// check keyname again, the result should be custoomized due to keyFileFlag
+	keyname, err = mk.getFileName("key", []string{"example.com", "localhost"})
+	if err != nil {
+		t.Error("failed to get customized key file name")
+	}
+	if keyname != "test-key-name.pem" {
+		t.Error("keyname check failed")
+	}
+
+	// check default certname, the result should be default file name generated by original principle
+	certname, err = mk.getFileName("cert", []string{"*.example.com", "localhost"})
+	if err != nil {
+		t.Error("failed to get default cert file name")
+	}
+	if certname != "_wildcard.example.com+1.pem" {
+		t.Error("certname check failed")
+	}
+
+	// check default p12name,  the result should be default file name generated by original principle
+	p12name, err = mk.getFileName("p12", []string{"x.co:y.com"})
+	if err != nil {
+		t.Error("failed to get default p12 file name")
+	}
+	if p12name != "x.co_y.com.p12" {
+		t.Error("p12 check failed")
+	}
+}

main.go

@@ -50,6 +50,10 @@ func main() {
 	var uninstallFlag = flag.Bool("uninstall", false, "uninstall the local root CA from the system trust store")
 	var pkcs12Flag = flag.Bool("pkcs12", false, "generate PKCS#12 instead of PEM")
 	var carootFlag = flag.Bool("CAROOT", false, "print the CAROOT path")
+	// customize file name according to issue#72
+	var keyFileFlag = flag.String("key-file", "", "customlize your key file name")
+	var certFileFlag = flag.String("cert-file", "", "customlize your cert file name")
+	var p12FileFlag = flag.String("p12-file", "", "customlize your p12 file name")
 	flag.Usage = func() { fmt.Fprintf(flag.CommandLine.Output(), usage) }
 	flag.Parse()
 	if *carootFlag {
@@ -64,6 +68,9 @@ func main() {
 	}
 	(&mkcert{
 		installMode: *installFlag, uninstallMode: *uninstallFlag, pkcs12: *pkcs12Flag,
+		keyFileFlag:  *keyFileFlag,
+		certFileFlag: *certFileFlag,
+		p12FileFlag:  *p12FileFlag,
 	}).Run(flag.Args())
 }
 
@@ -73,6 +80,7 @@ const keyName = "rootCA-key.pem"
 type mkcert struct {
 	installMode, uninstallMode             bool
 	pkcs12                                 bool
+	keyFileFlag, certFileFlag, p12FileFlag string
 
 	CAROOT string
 	caCert *x509.Certificate