61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
package forms
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import (
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"fmt"
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"net/mail"
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"reflect"
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"strconv"
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)
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type Validator func(fieldName string, value any, param string) error
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var Validators = map[string]Validator{
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"nonzero": nonzero,
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"minlen": minlen,
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"email": email,
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}
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func nonzero(field string, value any, _ string) error {
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v := reflect.ValueOf(value)
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if v.Kind() == reflect.String && v.Len() == 0 {
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return fmt.Errorf("field '%s' must not be empty", field)
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}
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if v.Kind() == reflect.Slice && v.Len() == 0 {
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return fmt.Errorf("field '%s' must not be empty", field)
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}
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if v.Kind() >= reflect.Int && v.Kind() <= reflect.Float64 && v.IsZero() {
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return fmt.Errorf("field '%s' must be non-zero", field)
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}
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return nil
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}
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func minlen(field string, value any, param string) error {
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min, err := strconv.Atoi(param)
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if err != nil {
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return fmt.Errorf("invalid minlen param for field '%s'", field)
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}
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if str, ok := value.(string); ok && len(str) < min {
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return fmt.Errorf("field '%s' must be at least %d characters", field, min)
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}
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return nil
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}
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func email(field string, value any, _ string) error {
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str, ok := value.(string)
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if !ok {
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return fmt.Errorf("field '%s' must be a valid email address", field)
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}
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_, err := mail.ParseAddress(str)
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if err != nil {
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return fmt.Errorf("invalid email address: %v", err)
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}
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return nil
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}
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