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validator.go
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validator.go
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package val
import (
"fmt"
"net/mail"
"regexp"
)
var (
isValidUsername = regexp.MustCompile(`^[a-z0-9_]+$`).MatchString
isValidFullName = regexp.MustCompile(`^[a-zA-Z\s]+$`).MatchString
)
func ValidateString(value string, minLength int, maxLength int) error {
n := len(value)
if n < minLength || n > maxLength {
return fmt.Errorf("must contain from %d-%d characters", minLength, maxLength)
}
return nil
}
func ValidateUsername(value string) error {
if err := ValidateString(value, 3, 100); err != nil {
return err
}
if !isValidUsername(value) {
return fmt.Errorf("must contain only lowercase letters, digits, or underscore")
}
return nil
}
func ValidateFullName(value string) error {
if err := ValidateString(value, 3, 100); err != nil {
return err
}
if !isValidFullName(value) {
return fmt.Errorf("must contain only letters or spaces")
}
return nil
}
func ValidatePassword(value string) error {
return ValidateString(value, 6, 100)
}
func ValidateEmail(value string) error {
if err := ValidateString(value, 3, 200); err != nil {
return err
}
if _, err := mail.ParseAddress(value); err != nil {
return fmt.Errorf("is not a valid email address")
}
return nil
}