Adding models, DB access, signup, login

* Created Base, Auth, User and Admin models
* Added skeleton API structure containing: User signup, User & Admin
login, authorized zones, ping tests
* Simple user signup functional
* Skeleton user login functional, no means to verify as of yet
* Added POSTMAN file

models/auth.go

@@ -0,0 +1,43 @@
+package models
+
+import (
+	"errors"
+	"time"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+type Auth struct {
+	Base
+	PasswordHash      string
+	TwoFactorSecret   string
+	TwoFactorRecovery string
+	Verified          bool
+}
+
+func (a *Auth) SetPassword(pass string) error {
+	passHash, _ := bcrypt.GenerateFromPassword([]byte(pass), bcrypt.DefaultCost)
+	a.PasswordHash = string(passHash)
+	return nil
+}
+
+func (a *Auth) CheckPassword(pass string) error {
+	return bcrypt.CompareHashAndPassword([]byte(a.PasswordHash), []byte(pass))
+}
+
+func (a *Auth) ValidateTwoFactor(tfCode string, stamp time.Time) error {
+	if tfCode == "" && a.TwoFactorSecret != "" {
+		return errors.New("requires 2FA")
+	} else if tfCode == "" && a.TwoFactorSecret == "" {
+		return nil
+	}
+
+	//TODO two factor
+	if len(tfCode) == 6 {
+		// Test 2FA
+		return errors.New("2FA invalid")
+	} else {
+		// May be a renewal code
+		return errors.New("unlock invalid")
+	}
+}