Source of CApiInputValidator.php - Zabbix

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                                ['if' => ['field' => '2', 'in' => implode(',', [ZBX_PREPROC_PROMETHEUS_FUNCTION])], 'type' => API_STRING_UTF8, 'flags' => API_REQUIRED, 'in' => implode(',', [ZBX_PREPROC_PROMETHEUS_SUM, ZBX_PREPROC_PROMETHEUS_MIN, ZBX_PREPROC_PROMETHEUS_MAX, ZBX_PREPROC_PROMETHEUS_AVG, ZBX_PREPROC_PROMETHEUS_COUNT])]
 
<?php
/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/
​
​
/**
 * API validator
 */
class CApiInputValidator {
​
    /**
     * Base validation function.
     *
     * @param array  $rule  validation rule
     * @param mixed  $data  import data
     * @param string $path  data path (for error reporting)
     * @param string $error
     *
     * @return bool
     */
    public static function validate(array $rule, &$data, $path, &$error) {
        $error = '';
​
        return self::validateData($rule, $data, $path, $error)
            && self::validateDataUniqueness($rule, $data, $path, $error);
    }
​
    /**
     * Base uniqueness validation function.
     *
     * @param array  $rule  validation rule
     * @param mixed  $data  import data
     * @param string $path  data path (for error reporting)
     * @param string $error
     *
     * @return bool
     */
    public static function validateUniqueness(array $rule, $data, $path, &$error) {
        $error = '';
​
        return self::validateDataUniqueness($rule, $data, $path, $error);
    }
​
    /**
     * Base data validation function.
     *
     * @param array  $rule
     * @param mixed  $data
     * @param string $path
     * @param string $error
     *
     * @return bool
     */
    private static function validateData($rule, &$data, $path, &$error) {
        switch ($rule['type']) {
            case API_CALC_FORMULA:
                return self::validateCalcFormula($rule, $data, $path, $error);
​
            case API_COLOR:
                return self::validateColor($rule, $data, $path, $error);
​
            case API_COLORS:
                return self::validateColors($rule, $data, $path, $error);
​
            case API_COND_FORMULA:
                return self::validateCondFormula($rule, $data, $path, $error);
​
            case API_COND_FORMULAID:
                return self::validateCondFormulaId($rule, $data, $path, $error);
​
            case API_STRING_UTF8:
                return self::validateStringUtf8($rule, $data, $path, $error);
​
            case API_ESCAPED_STRING_UTF8:
                return self::validateEscapedStringUtf8($rule, $data, $path, $error);
​
            case API_STRINGS_UTF8:
                return self::validateStringsUtf8($rule, $data, $path, $error);
​
            case API_INT32: