chore: introduce user email addresses (resolve #132)

models/user.go

@@ -1,8 +1,23 @@
 package models
 
+import "regexp"
+
+const (
+	MailPattern = "[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+"
+)
+
+var (
+	mailRegex *regexp.Regexp
+)
+
+func init() {
+	mailRegex = regexp.MustCompile(MailPattern)
+}
+
 type User struct {
 	ID               string     `json:"id" gorm:"primary_key"`
 	ApiKey           string     `json:"api_key" gorm:"unique"`
+	Email            string     `json:"email"`
 	Password         string     `json:"-"`
 	CreatedAt        CustomTime `gorm:"type:timestamp; default:CURRENT_TIMESTAMP" swaggertype:"string" format:"date" example:"2006-01-02 15:04:05.000"`
 	LastLoggedInAt   CustomTime `gorm:"type:timestamp; default:CURRENT_TIMESTAMP" swaggertype:"string" format:"date" example:"2006-01-02 15:04:05.000"`
@@ -24,6 +39,7 @@ type Login struct {
 
 type Signup struct {
 	Username       string `schema:"username"`
+	Email          string `schema:"email"`
 	Password       string `schema:"password"`
 	PasswordRepeat string `schema:"password_repeat"`
 }
@@ -34,6 +50,10 @@ type CredentialsReset struct {
 	PasswordRepeat string `schema:"password_repeat"`
 }
 
+type UserDataUpdate struct {
+	Email string `schema:"email"`
+}
+
 type TimeByUser struct {
 	User string
 	Time CustomTime
@@ -45,20 +65,29 @@ type CountByUser struct {
 }
 
 func (c *CredentialsReset) IsValid() bool {
-	return validatePassword(c.PasswordNew) &&
+	return ValidatePassword(c.PasswordNew) &&
 		c.PasswordNew == c.PasswordRepeat
 }
 
 func (s *Signup) IsValid() bool {
-	return validateUsername(s.Username) &&
-		validatePassword(s.Password) &&
+	return ValidateUsername(s.Username) &&
+		ValidateEmail(s.Email) &&
+		ValidatePassword(s.Password) &&
 		s.Password == s.PasswordRepeat
 }
 
-func validateUsername(username string) bool {
+func (r *UserDataUpdate) IsValid() bool {
+	return ValidateEmail(r.Email)
+}
+
+func ValidateUsername(username string) bool {
 	return len(username) >= 1 && username != "current"
 }
 
-func validatePassword(password string) bool {
+func ValidatePassword(password string) bool {
 	return len(password) >= 6
 }
+
+func ValidateEmail(email string) bool {
+	return email == "" || mailRegex.Match([]byte(email))
+}