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91 lines
1.8 KiB
91 lines
1.8 KiB
<?php
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class LtCaptcha
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{
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public $configHandle;
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public $storeHandle;
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public $imageEngine;
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public function __construct()
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{
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if (! $this->configHandle instanceof LtConfig)
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{
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if (class_exists("LtObjectUtil", false))
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{
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$this->configHandle = LtObjectUtil::singleton("LtConfig");
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}
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else
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{
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$this->configHandle = new LtConfig;
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}
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}
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}
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public function init()
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{
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if (!is_object($this->storeHandle))
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{
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$this->storeHandle = new LtStoreFile;
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$this->storeHandle->prefix = 'LtCaptcha-seed-';
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$this->storeHandle->init();
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}
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}
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public function getImageResource($seed)
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{
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if (empty($seed))
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{
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trigger_error("empty seed");
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return false;
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}
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if (!is_object($this->imageEngine))
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{
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if ($imageEngine = $this->configHandle->get("captcha.image_engine"))
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{
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if (class_exists($imageEngine))
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{
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$this->imageEngine = new $imageEngine;
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$this->imageEngine->conf = $this->configHandle->get("captcha.image_engine_conf");
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}
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else
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{
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trigger_error("captcha.image_engine : $imageEngine not exists");
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}
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}
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else
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{
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trigger_error("empty captcha.image_engine");
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return false;
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}
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}
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$word = $this->generateRandCaptchaWord($seed);
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$this->storeHandle->add($seed, $word);
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return $this->imageEngine->drawImage($word);
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}
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public function verify($seed, $userInput)
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{
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if ($word = $this->storeHandle->get($seed))
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{
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$this->storeHandle->del($seed);
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return $userInput === $word;
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}
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else
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{
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return false;
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}
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}
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protected function generateRandCaptchaWord()
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{
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$allowChars = $this->configHandle->get("captcha.allow_chars");
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$length = $this->configHandle->get("captcha.length");
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$allowedSymbolsLength = strlen($allowChars) - 1;
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$captchaWord = "";
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for ($i = 0; $i < $length; $i ++)
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{
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$captchaWord .= $allowChars[mt_rand(0, $allowedSymbolsLength)];
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}
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return $captchaWord;
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}
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}
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