add: Login system

internal/models/user.go

@@ -2,20 +2,21 @@ package models
 
 import (
 	"GoMembership/internal/constants"
-	"gorm.io/gorm"
 	"time"
+
+	"github.com/alexedwards/argon2id"
+	"gorm.io/gorm"
 )
 
 type User struct {
 	UpdatedAt      time.Time
 	DateOfBirth    time.Time `gorm:"not null" json:"date_of_birth" validate:"required,age"`
 	CreatedAt      time.Time
-	Salt           *string      `json:"-"`
 	Company        string       `json:"company" validate:"omitempty,omitnil"`
 	Phone          string       `json:"phone" validate:"omitempty,omitnil"`
 	Notes          *string      `json:"notes"`
 	FirstName      string       `gorm:"not null" json:"first_name" validate:"required"`
-	Password       string       `json:"password"`
+	Password       string       `json:"password" required_unless=RoleID 0`
 	Email          string       `gorm:"unique;not null" json:"email" validate:"required,email"`
 	LastName       string       `gorm:"not null" json:"last_name" validate:"required"`
 	ProfilePicture string       `json:"profile_picture" validate:"omitempty,omitnil,image"`
@@ -40,3 +41,12 @@ func (u *User) BeforeCreate(tx *gorm.DB) (err error) {
 	}
 	return
 }
+
+func (u *User) PasswordMatches(plaintextPassword string) (bool, error) {
+	match, err := argon2id.ComparePasswordAndHash(plaintextPassword, u.Password)
+	if err != nil {
+		return false, err
+	}
+
+	return match, nil
+}