增加图形验证码服务

composer.json

@@ -23,7 +23,8 @@
     "php": ">=7.1.0",
     "topthink/framework": "^6.0.0",
     "topthink/think-orm": "^2.0",
-    "liguangchun/ip": "^1.1"
+    "liguangchun/ip": "^1.1",
+    "ext-gd": "*"
   },
   "autoload": {
     "files": [

src/service/CaptchaService.php

@@ -0,0 +1,177 @@
+<?php
+
+// +----------------------------------------------------------------------
+// | ThinkLibrary 6.0 for ThinkPhP 6.0
+// +----------------------------------------------------------------------
+// | 版权所有 2017~2020 [ https://www.dtapp.net ]
+// +----------------------------------------------------------------------
+// | 官方网站: https://gitee.com/liguangchun/ThinkLibrary
+// +----------------------------------------------------------------------
+// | 开源协议 ( https://mit-license.org )
+// +----------------------------------------------------------------------
+// | gitee 仓库地址 ：https://gitee.com/liguangchun/ThinkLibrary
+// | github 仓库地址 ：https://github.com/GC0202/ThinkLibrary
+// | Packagist 地址 ：https://packagist.org/packages/liguangchun/think-library
+// +----------------------------------------------------------------------
+
+namespace DtApp\ThinkLibrary\service;
+
+use DtApp\ThinkLibrary\Service;
+
+/**
+ * 图形验证码服务
+ * Class CaptchaService
+ * @package DtApp\ThinkLibrary\service
+ */
+class CaptchaService extends Service
+{
+    private $code; // 验证码
+    private $uniqid; // 唯一序号
+    private $charset = 'ABCDEFGHKMNPRSTUVWXYZ23456789'; // 随机因子
+    private $codelen = 4; // 验证码长度
+    private $width = 130; // 宽度
+    private $height = 50; // 高度
+    private $img; // 图形资源句柄
+    private $font; // 指定的字体
+    private $fontsize = 20; // 指定字体大小
+    private $fontcolor; // 指定字体颜色
+
+    /**
+     * 服务初始化
+     * @param array $config
+     * @return CaptchaService
+     */
+    protected function initialize($config = [])
+    {
+        // 动态配置属性
+        foreach ($config as $k => $v) if (isset($this->$k)) $this->$k = $v;
+        // 生成验证码序号
+        $this->uniqid = uniqid('captcha') . mt_rand(1000, 9999);
+        // 生成验证码字符串
+        $length = strlen($this->charset) - 1;
+        for ($i = 0; $i < $this->codelen; $i++) {
+            $this->code .= $this->charset[mt_rand(0, $length)];
+        }
+        // 设置字体文件路径
+        $this->font = __DIR__ . '/bin/font.ttf';
+        // 缓存验证码字符串
+        $this->app->cache->set($this->uniqid, $this->code, 360);
+        // 返回当前对象
+        return $this;
+    }
+
+    /**
+     * 动态切换配置
+     * @param array $config
+     * @return $this
+     */
+    public function config($config = [])
+    {
+        return $this->initialize($config);
+    }
+
+    /**
+     * 获取验证码值
+     * @return string
+     */
+    public function getCode()
+    {
+        return $this->code;
+    }
+
+    /**
+     * 获取图片内容
+     * @return string
+     */
+    public function getData()
+    {
+        return "data:image/png;base64,{$this->createImage()}";
+    }
+
+    /**
+     * 获取验证码编号
+     * @return string
+     */
+    public function getUniqid()
+    {
+        return $this->uniqid;
+    }
+
+    /**
+     * 获取验证码数据
+     * @return array
+     */
+    public function getAttrs()
+    {
+        return [
+            'code'   => $this->getCode(),
+            'data'   => $this->getData(),
+            'uniqid' => $this->getUniqid(),
+        ];
+    }
+
+    /**
+     * 检查验证码是否正确
+     * @param string $code 需要验证的值
+     * @param string $uniqid 验证码编号
+     * @return boolean
+     */
+    public function check($code, $uniqid = null)
+    {
+        $_uni = is_string($uniqid) ? $uniqid : input('uniqid', '-');
+        $_val = $this->app->cache->get($_uni, '');
+        if (is_string($_val) && strtolower($_val) === strtolower($code)) {
+            $this->app->cache->delete($_uni);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * 输出图形验证码
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->getData();
+    }
+
+    /**
+     * 创建验证码图片
+     * @return string
+     */
+    private function createImage()
+    {
+        // 生成背景
+        $this->img = imagecreatetruecolor($this->width, $this->height);
+        $color = imagecolorallocate($this->img, mt_rand(220, 255), mt_rand(220, 255), mt_rand(220, 255));
+        imagefilledrectangle($this->img, 0, $this->height, $this->width, 0, $color);
+        // 生成线条
+        for ($i = 0; $i < 6; $i++) {
+            $color = imagecolorallocate($this->img, mt_rand(0, 50), mt_rand(0, 50), mt_rand(0, 50));
+            imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $color);
+        }
+        // 生成雪花
+        for ($i = 0; $i < 100; $i++) {
+            $color = imagecolorallocate($this->img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
+            imagestring($this->img, mt_rand(1, 5), mt_rand(0, $this->width), mt_rand(0, $this->height), '*', $color);
+        }
+        // 生成文字
+        $_x = $this->width / $this->codelen;
+        for ($i = 0; $i < $this->codelen; $i++) {
+            $this->fontcolor = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
+            if (function_exists('imagettftext')) {
+                imagettftext($this->img, $this->fontsize, mt_rand(-30, 30), $_x * $i + mt_rand(1, 5), $this->height / 1.4, $this->fontcolor, $this->font, $this->code[$i]);
+            } else {
+                imagestring($this->img, 15, $_x * $i + mt_rand(10, 15), mt_rand(10, 30), $this->code[$i], $this->fontcolor);
+            }
+        }
+        ob_start();
+        imagepng($this->img);
+        $data = ob_get_contents();
+        ob_end_clean();
+        imagedestroy($this->img);
+        return base64_encode($data);
+    }
+}