84 lines
2.6 KiB
PHP
84 lines
2.6 KiB
PHP
<?php
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namespace urlManipulator;
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class UrlManipulator extends AbstractUrlManipulator
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{
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private $paramsArray = ['param1', 'param2', 'param3', 'param4'];
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public function manipulateUrl($url): array
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{
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// Using Session to store the original URL and used parameters
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session_start();
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// Check if the original URL is stored in the session
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if (!isset($_SESSION['originalUrl'])) {
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// Store the original URL in the session
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$_SESSION['originalUrl'] = $url;
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// Initialize the used parameters array in the session
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$_SESSION['usedParams'] = [];
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}
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$originalUrl = $_SESSION['originalUrl'];
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$usedParams = $_SESSION['usedParams'];
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// Get a new parameter to add to the URL from the predefined array and existing parameters
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$newParam = $this->getNewParam($usedParams, $originalUrl);
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// If no new parameter is found, return an error
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if (!$newParam) {
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return ['error' => 'Unable to find a unique parameter to add', 'input' => $url];
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}
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$randomValue = $this->generateRandomValue();
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$modifiedUrl = $this->addParamToUrl($originalUrl, $newParam, $randomValue);
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// Store the used parameter in the session
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$usedParams[] = $newParam;
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$_SESSION['usedParams'] = $usedParams;
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return [
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'before' => $originalUrl,
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'after' => $modifiedUrl,
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];
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}
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protected function addParamToUrl(string $url, string $param, string $value): string
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{
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$separator = (parse_url($url, PHP_URL_QUERY) == null) ? '?' : '&';
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if (strpos($url, $param . '=') !== false) {
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$modifiedUrl = preg_replace('/(' . $param . '=)[^&]+/', '$1' . urlencode($value), $url);
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} else {
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$modifiedUrl = $url . $separator . urlencode($param) . '=' . urlencode($value);
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}
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return $modifiedUrl;
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}
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protected function generateRandomValue(): string
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{
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return uniqid();
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}
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protected function getNewParam(array $usedParams, string $originalUrl)
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{
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$parsedUrl = parse_url($originalUrl);
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$existingParams = [];
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// Extract existing params from the original URL
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if (isset($parsedUrl['query'])) {
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parse_str($parsedUrl['query'], $existingParams);
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}
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// Find the first unused parameter from the predefined array and existing parameters
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foreach ($this->paramsArray as $param) {
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if (!in_array($param, $usedParams) && !array_key_exists($param, $existingParams)) {
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return $param;
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}
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}
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return null;
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}
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}
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