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/statistics.go

@@ -0,0 +1,37 @@
+package domain
+
+import "time"
+
+type PeerStatus struct {
+	PeerId    PeerIdentifier `gorm:"primaryKey;column:identifier"`
+	UpdatedAt time.Time      `gorm:"column:updated_at"`
+
+	IsPingable bool       `gorm:"column:pingable"`
+	LastPing   *time.Time `gorm:"column:last_ping"`
+
+	BytesReceived    uint64 `gorm:"column:received"`
+	BytesTransmitted uint64 `gorm:"column:transmitted"`
+
+	LastHandshake    *time.Time `gorm:"column:last_handshake"`
+	Endpoint         string     `gorm:"column:endpoint"`
+	LastSessionStart *time.Time `gorm:"column:last_session_start"`
+}
+
+func (s PeerStatus) IsConnected() bool {
+	oldestHandshakeTime := time.Now().Add(-2 * time.Minute) // if a handshake is older than 2 minutes, the peer is no longer connected
+
+	handshakeValid := false
+	if s.LastHandshake != nil {
+		handshakeValid = !s.LastHandshake.Before(oldestHandshakeTime)
+	}
+
+	return s.IsPingable || handshakeValid
+}
+
+type InterfaceStatus struct {
+	InterfaceId InterfaceIdentifier `gorm:"primaryKey;column:identifier"`
+	UpdatedAt   time.Time           `gorm:"column:updated_at"`
+
+	BytesReceived    uint64 `gorm:"column:received"`
+	BytesTransmitted uint64 `gorm:"column:transmitted"`
+}