72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package validator
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import (
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"reflect"
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"strings"
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)
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// Required validates that a field has a value.
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// For strings, it also checks that the value is not empty or just whitespace.
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// For slices, it checks that the slice is not empty.
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func Required() ValidatorFunc {
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return func(value any) *ValidationError {
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actualValue, isNil := dereferenceValue(value)
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if isNil {
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return newValidationError(ErrorCodeRequired, "field is required")
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}
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switch v := actualValue.(type) {
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case string:
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if strings.TrimSpace(v) == "" {
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return newValidationError(ErrorCodeRequired, "field is required")
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}
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default:
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rv := reflect.ValueOf(actualValue)
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if rv.Kind() == reflect.Slice && rv.Len() == 0 {
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return newValidationError(ErrorCodeRequired, "field is required")
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}
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}
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return nil
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}
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}
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// NotEmpty validates that a field is not empty.
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// Similar to Required, but can be used independently.
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func NotEmpty() ValidatorFunc {
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return func(value any) *ValidationError {
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actualValue, isNil := dereferenceValue(value)
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if isNil {
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return nil
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}
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switch v := actualValue.(type) {
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case string:
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if strings.TrimSpace(v) == "" {
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return newValidationError(ErrorCodeRequired, "field cannot be empty")
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}
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default:
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rv := reflect.ValueOf(actualValue)
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if rv.Kind() == reflect.Slice && rv.Len() == 0 {
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return newValidationError(ErrorCodeRequired, "field cannot be empty")
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}
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}
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return nil
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}
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}
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