Эти кастомные валидаторы предназначены для проверок, которые можно выполнить, имея **только** те же **данные**, что пришли в запросе.

///

### Понимание этого кода { #understand-that-code }

Важный момент — это использовать **`AfterValidator` с функцией внутри `Annotated`**. Смело пропускайте эту часть. 🤸

---

Но если вам любопытен именно этот пример и всё ещё интересно, вот немного подробностей.

func (a adminAPIHandlers) AddServiceAccountLDAP(w http.ResponseWriter, r *http.Request) {
	ctx, cred, opts, createReq, targetUser, APIError := commonAddServiceAccount(r, true)
	if APIError.Code != "" {
		writeErrorResponseJSON(ctx, w, APIError, r.URL)
		return
	}

	// fail if ldap is not enabled
	if !globalIAMSys.LDAPConfig.Enabled() {

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package bufio

import (
	"bytes"
	"errors"
	"io"
	"unicode/utf8"
)

// Scanner provides a convenient interface for reading data such as
// a file of newline-delimited lines of text. Successive calls to
// the [Scanner.Scan] method will step through the 'tokens' of a file, skipping

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package bytes_test

import (
	"bytes"
	"encoding/base64"
	"fmt"
	"io"
	"os"
	"slices"
	"strconv"
	"unicode"
)

func ExampleBuffer() {
	var b bytes.Buffer // A Buffer needs no initialization.
	b.Write([]byte("Hello "))
	fmt.Fprintf(&b, "world!")

// Code generated by avx512test. DO NOT EDIT.

#include "../../../../../../runtime/textflag.h"

TEXT asmtest_gfni_avx512f(SB), NOSPLIT, $0
	VGF2P8AFFINEINVQB $64, X8, X31, K3, X26            // 62438503cfd040
	VGF2P8AFFINEINVQB $64, X1, X31, K3, X26            // 62638503cfd140
	VGF2P8AFFINEINVQB $64, X0, X31, K3, X26            // 62638503cfd040
	VGF2P8AFFINEINVQB $64, -17(BP), X31, K3, X26       // 62638503cf95efffffff40

/*!
 * Font Awesome Free 5.12.0 by @fontawesome - https://fontawesome.com
 * License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)
 */

        return "index.jsp";
    }

    /**
     * Constructs a localized page path with language and country.
     *
     * @param page the page name
     * @param lang the language code
     * @param country the country code
     * @return the localized page path
     */
    private String getLocalizedPagePath(final String page, final String lang, final String country) {

// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

/*
Package zip provides support for reading and writing ZIP archives.

See the [ZIP specification] for details.

This package does not support disk spanning.

A note about ZIP64:

To be backwards compatible the FileHeader has both 32 and 64 bit Size

if [ $ATTEMPTS -gt $LIMIT ]; then exit 1 ; fi ; sleep 2 ; # 1 second intervals between attempts $MC_COMMAND ; STATUS=$? ; done ; set -e ; # reset `e` as active return 0 } # checkBucketExists ($bucket) # Check if the bucket exists, by using the exit code of `mc ls` checkBucketExists() { BUCKET=$1 CMD=$(${MC} stat myminio/$BUCKET > /dev/null 2>&1) return $? } # createBucket ($bucket, $policy, $purge) # Ensure bucket exists, purging if asked to createBucket() { BUCKET=$1 POLICY=$2 PURGE=$3 VERSIONING=$4...

if [ $ATTEMPTS -gt $LIMIT ]; then exit 1 ; fi ; sleep 2 ; # 1 second intervals between attempts $MC_COMMAND ; STATUS=$? ; done ; set -e ; # reset `e` as active return 0 } # checkBucketExists ($bucket) # Check if the bucket exists, by using the exit code of `mc ls` checkBucketExists() { BUCKET=$1 CMD=$(${MC} stat myminio/$BUCKET > /dev/null 2>&1) return $? } # createBucket ($bucket, $policy, $purge) # Ensure bucket exists, purging if asked to createBucket() { BUCKET=$1 POLICY=$2 PURGE=$3 VERSIONING=$4...