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validator.go
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/
validator.go
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package val
import (
"errors"
"fmt"
"net/mail"
"regexp"
)
var (
isValidUsername = regexp.MustCompile(`^[a-zA-Z0-9_]+$`).MatchString
isValidFullName = regexp.MustCompile(`^[a-zA-Z]+([\s]?[a-zA-Z]*)*$`).MatchString
)
func ValidateString(str string, minLen int, maxLen int) error {
if len(str) > maxLen ||
len(str) < minLen {
return fmt.Errorf("must contain %d-%d characters", minLen, maxLen)
}
return nil
}
func ValidateUsername(username string) error {
if err := ValidateString(username, 3, 100); err != nil {
return err
}
if !isValidUsername(username) {
return errors.New("username must contain only small/big case letters, digits and underscore")
}
return nil
}
func ValidatePassword(password string) error {
if err := ValidateString(password, 6, 100); err != nil {
return err
}
return nil
}
func ValidateEmail(email string) error {
if err := ValidateString(email, 6, 100); err != nil {
return err
}
if _, err := mail.ParseAddress(email); err != nil {
return errors.New("invalid email format")
}
return nil
}
func ValidateFullName(fullName string) error {
if err := ValidateString(fullName, 3, 100); err != nil {
return err
}
if !isValidFullName(fullName) {
return errors.New("full name must contain only small/big case letters and spaces")
}
return nil
}