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/context.go

@@ -0,0 +1,74 @@
+package domain
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/gin-gonic/gin"
+)
+
+const CtxUserInfo = "userInfo"
+
+const (
+	CtxSystemAdminId = "_WG_SYS_ADMIN_"
+	CtxUnknownUserId = "_WG_SYS_UNKNOWN_"
+)
+
+type ContextUserInfo struct {
+	Id      UserIdentifier
+	IsAdmin bool
+}
+
+func (u *ContextUserInfo) String() string {
+	return fmt.Sprintf("%s|%t", u.Id, u.IsAdmin)
+}
+
+func (u *ContextUserInfo) UserId() string {
+	return string(u.Id)
+}
+
+func DefaultContextUserInfo() *ContextUserInfo {
+	return &ContextUserInfo{
+		Id:      CtxUnknownUserId,
+		IsAdmin: false,
+	}
+}
+
+func SystemAdminContextUserInfo() *ContextUserInfo {
+	return &ContextUserInfo{
+		Id:      CtxSystemAdminId,
+		IsAdmin: true,
+	}
+}
+
+func SetUserInfoFromGin(c *gin.Context) context.Context {
+	ginUserInfo, exists := c.Get(CtxUserInfo)
+
+	info := DefaultContextUserInfo()
+	if exists {
+		if ginInfo, ok := ginUserInfo.(*ContextUserInfo); ok {
+			info = ginInfo
+		}
+	}
+
+	ctx := SetUserInfo(c.Request.Context(), info)
+	return ctx
+}
+
+func SetUserInfo(ctx context.Context, info *ContextUserInfo) context.Context {
+	ctx = context.WithValue(ctx, CtxUserInfo, info)
+	return ctx
+}
+
+func GetUserInfo(ctx context.Context) *ContextUserInfo {
+	rawInfo := ctx.Value(CtxUserInfo)
+	if rawInfo == nil {
+		return DefaultContextUserInfo()
+	}
+
+	if info, ok := rawInfo.(*ContextUserInfo); ok {
+		return info
+	}
+
+	return DefaultContextUserInfo()
+}