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extend/app_alipay/lotusphp_runtime/Captcha/Captcha.php

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