init

Captcha.php

@@ -0,0 +1,20 @@
+<?php
+namespace daimakuai\captcha;
+use Yii;
+use daimakuai\captcha\yii2CaptchaAsset;
+
+class Captcha extends \yii\captcha\Captcha
+{
+    public $template = '<div class="daimakuai-captcha">{image} {input}</div>';
+    public function run()
+    {
+        $this->registerClientScript();
+        parent::run();
+    }
+
+    public function registerClientScript()
+    {
+        yii2CaptchaAsset::register(Yii::$app->getView());
+        parent::registerClientScript();
+    }
+}

CaptchaAction.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace daimakuai\captcha;
+use Yii;
+use yii\helpers\Url;
+use yii\web\Response;
+
+class CaptchaAction extends \yii\captcha\CaptchaAction
+{
+    public $fontFile = '@daimakuai/captcha/font/LithosPro-Regular.otf';
+    public $foreColor = 0x999999;
+    public $type = 'default'; // numbers & letters
+    public $offset = -2;
+
+    public function run()
+    {
+        if($this->type == 'numbers')
+        {
+            $this->offset = -10;
+        }
+        if (Yii::$app->request->getQueryParam(self::REFRESH_GET_VAR) !== null) {
+            // AJAX request for regenerating code
+            $code = $this->getVerifyCode(true);
+            Yii::$app->response->format = Response::FORMAT_JSON;
+            return [
+                'hash1' => $this->generateValidationHash($code),
+                'hash2' => $this->generateValidationHash(strtolower($code)),
+                // we add a random 'v' parameter so that FireFox can refresh the image
+                // when src attribute of image tag is changed
+                'url' => Url::to([$this->id, 'v' => uniqid()]),
+            ];
+        } else {
+            $this->setHttpHeaders();
+            Yii::$app->response->format = Response::FORMAT_RAW;
+            return $this->renderImage($this->getVerifyCode());
+        }
+//        $view->registerJs('yii.captcha.validation.js');
+    }
+
+    protected function generateVerifyCode()
+    {
+        if ($this->minLength > $this->maxLength) {
+            $this->maxLength = $this->minLength;
+        }
+        if ($this->minLength < 4) {
+            $this->minLength = 4;
+        }
+        if ($this->maxLength > 9) {
+            $this->maxLength = 9;
+        }
+        $length = mt_rand($this->minLength, $this->maxLength);
+
+        $str = '0123456789bcdfghjklmnpqrstvwxyz';
+        $code = '';
+        for ($i = 0; $i < $length; $i++) {
+            switch ($this->type)
+            {
+                case 'numbers':
+                    $code .= $str[mt_rand(0, 9)];
+                    break;
+                case 'letters':
+                    $code .= $str[mt_rand(10, 30)];
+                    break;
+                default:
+                    $code .= $str[mt_rand(0, 30)];
+            }
+        }
+
+        return $code;
+    }
+
+    public function validate($input, $caseSensitive)
+    {
+        $input = $this->_changeInvalidNumbers($input);
+        $code = $this->getVerifyCode();
+        $valid = $caseSensitive ? ($input === $code) : strcasecmp($input, $code) === 0;
+        $session = Yii::$app->getSession();
+        $session->open();
+        $name = $this->getSessionKey() . 'count';
+        $session[$name] = $session[$name] + 1;
+        if ($valid || $session[$name] > $this->testLimit && $this->testLimit > 0) {
+            $this->getVerifyCode(true);
+        }
+
+        return $valid;
+    }
+
+    private function _changeInvalidNumbers($input)
+    {
+        $enNumbers = ['0','1','2','3','4','5','6','7','8','9'];
+        $faNumbers = ['۰','۱','۲','۳','۴','۵','۶','۷','۸','۹'];
+        $arNumbers = ['٠','١','٢','٣','٤','٥','٦','٧','٨','٩'];
+        $input = str_replace($faNumbers,$enNumbers,$input);
+        $input = str_replace($arNumbers,$enNumbers,$input);
+
+        return $input;
+    }
+}