V2 alpha - initial version (#172)

Initial alpha codebase for version 2 of WireGuard Portal.
This version is considered unstable and incomplete (for example, no public REST API)! 
Use with care!


Fixes/Implements the following issues:
 - OAuth support #154, #1 
 - New Web UI with internationalisation support #98, #107, #89, #62
 - Postgres Support #49 
 - Improved Email handling #47, #119 
 - DNS Search Domain support #46 
 - Bugfixes #94, #48 

---------

Co-authored-by: Fabian Wechselberger <wechselbergerf@hotmail.com>

internal/domain/crypto.go

@@ -0,0 +1,67 @@
+package domain
+
+import (
+	"encoding/base64"
+
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+type KeyPair struct {
+	PrivateKey string
+	PublicKey  string
+}
+
+func (p KeyPair) GetPrivateKeyBytes() []byte {
+	data, _ := base64.StdEncoding.DecodeString(p.PrivateKey)
+	return data
+}
+
+func (p KeyPair) GetPublicKeyBytes() []byte {
+	data, _ := base64.StdEncoding.DecodeString(p.PublicKey)
+	return data
+}
+
+func (p KeyPair) GetPrivateKey() wgtypes.Key {
+	key, _ := wgtypes.ParseKey(p.PrivateKey)
+	return key
+}
+
+func (p KeyPair) GetPublicKey() wgtypes.Key {
+	key, _ := wgtypes.ParseKey(p.PublicKey)
+	return key
+}
+
+type PreSharedKey string
+
+func NewFreshKeypair() (KeyPair, error) {
+	privateKey, err := wgtypes.GeneratePrivateKey()
+	if err != nil {
+		return KeyPair{}, err
+	}
+
+	return KeyPair{
+		PrivateKey: privateKey.String(),
+		PublicKey:  privateKey.PublicKey().String(),
+	}, nil
+}
+
+func NewPreSharedKey() (PreSharedKey, error) {
+	preSharedKey, err := wgtypes.GenerateKey()
+	if err != nil {
+		return "", err
+	}
+
+	return PreSharedKey(preSharedKey.String()), nil
+}
+
+func KeyBytesToString(key []byte) string {
+	return base64.StdEncoding.EncodeToString(key)
+}
+
+func PublicKeyFromPrivateKey(key string) string {
+	privKey, err := wgtypes.ParseKey(key)
+	if err != nil {
+		return ""
+	}
+	return privKey.PublicKey().String()
+}