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<?php declare(strict_types = 0);
/*
** 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/>.
**/
/**
* Class to normalize incoming data.
*/
class CImportDataNormalizer {
protected $rules;
private $preview = false;
public const EOL_LF = 0x01;
public const LOWERCASE = 0x02;
public function __construct(array $schema) {
$this->rules = $schema;
}
/**
* On import preview validation should not change content.
*
* @return bool
*/
public function isPreview(): bool {
return $this->preview;
}
/**
* On import preview validation should not change content.
*
* @param bool $preview
*
* @return self
*/
public function setPreview(bool $preview): self {
$this->preview = $preview;
return $this;
}
public function normalize(array $data): array {
$data['zabbix_export'] = $this->convert($data['zabbix_export'], $this->rules);
return $data;
}
/**
* Convert array keys to numeric and normalize strings.
*
* @param mixed $data Import data.
* @param array $rules Schema rules.
*
* @return mixed
*/
protected function convert($data, array $rules) {
if (!is_array($data)) {
if ($rules['type'] & XML_STRING) {
$data = $this->normalizeStrings($data, $rules);
if (array_key_exists('flags', $rules) && $rules['flags'] & self::LOWERCASE) {
$data = mb_strtolower($data);
}
}
return $data;
}
if ($rules['type'] & XML_ARRAY) {
if (!$data) {
return $data;
}
foreach ($rules['rules'] as $tag => $tag_rules) {
$tag_rules = $this->getResultRule($tag_rules, $data, $rules['rules']);
if ($tag_rules['type'] & XML_IGNORE_TAG) {
continue;
}
if (array_key_exists('ex_rules', $tag_rules)) {
$tag_rules = call_user_func($tag_rules['ex_rules'], $data);
}
if (array_key_exists($tag, $data)) {
$data[$tag] = $this->convert($data[$tag], $tag_rules);
}
}
}
elseif ($rules['type'] & XML_INDEXED_ARRAY) {
$prefix = $rules['prefix'];
foreach ($data as $tag => $value) {
$data[$tag] = $this->convert($value, $rules['rules'][$prefix]);
}
$data = array_values($data);
}
return $data;
}
/**
* Add CR to string type fields.
*
* @param string $data Import data.
* @param array $rules Schema rules.
*
* @return string
*/
protected function normalizeStrings(string $data, array $rules): string {
$data = str_replace("\r\n", "\n", $data);
$data = (array_key_exists('flags', $rules) && $rules['flags'] & self::EOL_LF)
? $data
: str_replace("\n", "\r\n", $data);
return $data;
}
private function getResultRule(array $tag_rules, array $data, array $parent_rules): array {
while ($tag_rules['type'] & XML_MULTIPLE) {
$matched_multiple_rule = null;
foreach ($tag_rules['rules'] as $multiple_rule) {
if ($this->multipleRuleMatched($multiple_rule, $data, $parent_rules)) {
$multiple_rule['type'] = ($tag_rules['type'] & XML_REQUIRED) | $multiple_rule['type'];
$matched_multiple_rule =
$multiple_rule + array_intersect_key($tag_rules, array_flip(['default']));
break;
}
}
if ($matched_multiple_rule === null) {
// For use by developers. Do not translate.
throw new Exception('Incorrect XML_MULTIPLE validation rules.');
}
$tag_rules = $matched_multiple_rule;
}
return $tag_rules;
}
private function multipleRuleMatched(array $multiple_rule, array $data, array $rules): bool {
if (array_key_exists('else', $multiple_rule)) {
return true;
}
elseif (is_array($multiple_rule['if'])) {
$field_name = $multiple_rule['if']['tag'];
if ($this->isPreview()) {
if (array_key_exists($field_name, $data)) {
return in_array($data[$field_name], $multiple_rule['if']['in']);
}
else {
$tag_rules = self::getResultRule($rules[$field_name], $data, $rules);
return array_key_exists($tag_rules['default'], $multiple_rule['if']['in']);
}
}
else {
return array_key_exists($data[$field_name], $multiple_rule['if']['in']);
}
}
elseif ($multiple_rule['if'] instanceof Closure) {
return call_user_func($multiple_rule['if'], $data);
}
return false;
}
}
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