mirror of
https://github.com/hakasenyang/php-shortlink
synced 2026-08-22 07:03:08 +09:00
131 lines
4.9 KiB
PHP
131 lines
4.9 KiB
PHP
<?php
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class ShortLink {
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/**
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* Please enter the correct DB information.
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* @var string
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*/
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private $db_ip = '127.0.0.1';
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private $db_id = 'hakase';
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private $db_pw = 'hakase';
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private $db_name = 'hakase';
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/**
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* mysqli Connect data.
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* @var class
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*/
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private $mysqli;
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/**
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* Connect DB
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*/
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public function __construct() {
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$this->mysqli = @new mysqli($this->db_ip, $this->db_id, $this->db_pw, $this->db_name);
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if ($this->mysqli->connect_errno) die('DB Connect ERROR!!!');
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}
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/**
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* Generate a random string, using a cryptographically secure
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* pseudorandom number generator (random_int)
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*
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* For PHP 7, random_int is a PHP core function
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* For PHP 5.x, depends on https://github.com/paragonie/random_compat
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*
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* @param int $length How many characters do we want?
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* @param string $keyspace A string of all possible characters
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* to select from
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* @return string
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*/
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private function random_str($length, $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
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{
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$pieces = [];
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$max = mb_strlen($keyspace, '8bit') - 1;
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for ($i = 0; $i < $length; ++$i) {
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$pieces []= $keyspace[random_int(0, $max)];
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}
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return implode('', $pieces);
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}
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/**
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* DB Select Function
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* @param string $text Short URL data
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* @param string $url URL data (optional)
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* @return array Output DB data
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*/
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private function Select($text, $url = NULL) {
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if (!is_null($text)) $text = htmlspecialchars($text);
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if (!is_null($url)) $url = htmlspecialchars($url);
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return $this->mysqli->query('select randstr, url from shortlink where url = \'' . $url . '\' or randstr = \'' . $text . '\';')->fetch_array(MYSQLI_ASSOC);
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}
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/**
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* Create a short URL address.
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* @param string $url URL data
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* @param string $text Short URL data (optional)
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* @return array/null When a valid value comes in,
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* it returns the source address and the short URL.
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* If it is not a valid value, it returns NULL.
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*/
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public function Make($url, $text = NULL) {
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if (!is_NULL($text) &&
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(strlen($text) > 16 || strlen($text < 3))) return NULL;
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$select = $this->Select($text, $url);
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$url = htmlspecialchars($url);
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if ($text === NULL)
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$text = $this->random_str(rand(3, 16));
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if (!is_null($select['url']) &&
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$url === $select['url']) {
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return array('randstr' => $select['randstr'], 'url' => $select['url']);
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}
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if (!is_null($select['randstr']) &&
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$select['randstr'] === $text &&
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$select['url'] !== $url)
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return NULL;
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if (!is_null($select['randstr']))
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return $this->Make($url);
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$text = htmlspecialchars($text);
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return ($this->mysqli->query('INSERT INTO shortlink(randstr, url) VALUES (\'' . $text . '\', \'' . $url . '\');')) ? array('randstr' => $text, 'url' => $url) : 0;
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}
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/**
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* Returns the short URL as the source URL.
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* @param string $text Short URL
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* @return string/null Returns the source URL,
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* if there is a source URL, or NULL if there is no source URL.
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*/
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public function LinkCheck($text) {
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$data = $this->Select($text);
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return (!is_null($data['url']) && !is_null($data['randstr'])) ? $data['url'] : NULL;
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}
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/**
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* Move the source URL to the page.
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* @param string Short URL
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* @return null
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*/
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public function move_header($text) {
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$data = $this->LinkCheck($text);
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if (!is_null($data)) {
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header($_SERVER['SERVER_PROTOCOL'] . ' 301 Moved Permanently');
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header('Location: ' . $data);
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die('<!doctype html><html><head><title>Move</title></head><body><a href="' . $data . '">Move</a></body></html>');
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}
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return NULL;
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}
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}
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$short = new ShortLink();
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if ($_POST['url']) {
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$data = $short->Make($_POST['url'], $_POST['str']);
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if (!is_null($_POST['str']) &&
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(strlen($_POST['str']) > 16 || strlen($_POST['str']) < 3)) die('Short URL must be between 3 and 16 characters long.');
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else if ($data['randstr'] !== $_POST['str'] &&
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!is_null($_POST['str']) &&
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$data['url'] === $_POST['url']) die('Already registered - https://' . $_SERVER['HTTP_HOST'] . '/' . $data['randstr']);
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else if (!is_null($data['url'])) die('https://' . $_SERVER['HTTP_HOST'] . '/' . $data['randstr']);
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else die('Already registered short URL.');
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}
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if (strlen($_SERVER['QUERY_STRING']) >= 1)
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$short->move_header($_SERVER['QUERY_STRING']);
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?>
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<form method="post">
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<input type="text" name="url" id="url" value="https://hakase.io/">
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<input type="submit">
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</form>
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Hakase's Short Link Service
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