feat: embed optional apps in player server

pkg/selfsigned/cert.go

@@ -0,0 +1,120 @@
+package selfsigned
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/ed25519"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"math/big"
+	"net"
+	"time"
+
+	"forge.cadoles.com/arcad/arcast/pkg/network"
+	"github.com/pkg/errors"
+)
+
+func NewLANCert() (*tls.Certificate, error) {
+	hosts, err := network.GetLANIPv4Addrs()
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	hosts = append(hosts, "127.0.0.1")
+
+	rawCert, rawKey, err := NewCertKeyPair(hosts...)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	cert, err := tls.X509KeyPair(rawCert, rawKey)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	return &cert, nil
+}
+
+func NewCertKeyPair(hosts ...string) ([]byte, []byte, error) {
+	priv, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
+	if err != nil {
+		return nil, nil, errors.WithStack(err)
+	}
+
+	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
+	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
+	if err != nil {
+		return nil, nil, errors.WithStack(err)
+	}
+
+	keyUsage := x509.KeyUsageDigitalSignature
+
+	notBefore := time.Now()
+	notAfter := notBefore.Add(365 * 24 * time.Hour)
+
+	template := x509.Certificate{
+		SerialNumber: serialNumber,
+		Subject: pkix.Name{
+			Organization: []string{"Arcast Org"},
+		},
+		NotBefore: notBefore,
+		NotAfter:  notAfter,
+
+		KeyUsage:              keyUsage,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+	}
+
+	for _, h := range hosts {
+		if ip := net.ParseIP(h); ip != nil {
+			template.IPAddresses = append(template.IPAddresses, ip)
+		} else {
+			template.DNSNames = append(template.DNSNames, h)
+		}
+	}
+
+	template.IsCA = true
+	template.KeyUsage |= x509.KeyUsageCertSign
+
+	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
+	if err != nil {
+		return nil, nil, errors.WithStack(err)
+	}
+
+	var cert bytes.Buffer
+
+	if err := pem.Encode(&cert, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
+		return nil, nil, errors.WithStack(err)
+	}
+
+	var key bytes.Buffer
+
+	privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
+	if err != nil {
+		return nil, nil, errors.WithStack(err)
+	}
+
+	if err := pem.Encode(&key, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
+		return nil, nil, errors.WithStack(err)
+	}
+
+	return cert.Bytes(), key.Bytes(), nil
+}
+
+func publicKey(priv any) any {
+	switch k := priv.(type) {
+	case *rsa.PrivateKey:
+		return &k.PublicKey
+	case *ecdsa.PrivateKey:
+		return &k.PublicKey
+	case ed25519.PrivateKey:
+		return k.Public().(ed25519.PublicKey)
+	default:
+		return nil
+	}
+}