<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\captcha;

use Yii;
use yii\base\Action;
use yii\base\InvalidConfigException;
use yii\helpers\Url;

/**
 * CaptchaAction renders a CAPTCHA image.
 *
 * CaptchaAction is used together with [[Captcha]] and [[\yii\captcha\CaptchaValidator]]
 * to provide the [CAPTCHA](http://en.wikipedia.org/wiki/Captcha) feature.
 *
 * By configuring the properties of CaptchaAction, you may customize the appearance of
 * the generated CAPTCHA images, such as the font color, the background color, etc.
 *
 * Note that CaptchaAction requires either GD2 extension or ImageMagick PHP extension.
 *
 * Using CAPTCHA involves the following steps:
 *
 * 1. Override [[\yii\web\Controller::actions()]] and register an action of class CaptchaAction with ID 'captcha'
 * 2. In the form model, declare an attribute to store user-entered verification code, and declare the attribute
 *    to be validated by the 'captcha' validator.
 * 3. In the controller view, insert a [[Captcha]] widget in the form.
 *
 * @property string $verifyCode The verification code. This property is read-only.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class CaptchaAction extends Action
{
    /**
     * The name of the GET parameter indicating whether the CAPTCHA image should be regenerated.
     */
    const REFRESH_GET_VAR = 'refresh';
    /**
     * @var integer how many times should the same CAPTCHA be displayed. Defaults to 3.
     * A value less than or equal to 0 means the test is unlimited (available since version 1.1.2).
     */
    public $testLimit = 3;
    /**
     * @var integer the width of the generated CAPTCHA image. Defaults to 120.
     */
    public $width = 120;
    /**
     * @var integer the height of the generated CAPTCHA image. Defaults to 50.
     */
    public $height = 50;
    /**
     * @var integer padding around the text. Defaults to 2.
     */
    public $padding = 2;
    /**
     * @var integer the background color. For example, 0x55FF00.
     * Defaults to 0xFFFFFF, meaning white color.
     */
    public $backColor = 0xFFFFFF;
    /**
     * @var integer the font color. For example, 0x55FF00. Defaults to 0x2040A0 (blue color).
     */
    public $foreColor = 0x2040A0;
    /**
     * @var boolean whether to use transparent background. Defaults to false.
     */
    public $transparent = false;
    /**
     * @var integer the minimum length for randomly generated word. Defaults to 6.
     */
    public $minLength = 6;
    /**
     * @var integer the maximum length for randomly generated word. Defaults to 7.
     */
    public $maxLength = 7;
    /**
     * @var integer the offset between characters. Defaults to -2. You can adjust this property
     * in order to decrease or increase the readability of the captcha.
     **/
    public $offset = -2;
    /**
     * @var string the TrueType font file. This can be either a file path or path alias.
     */
    public $fontFile = '@yii/captcha/SpicyRice.ttf';
    /**
     * @var string the fixed verification code. When this property is set,
     * [[getVerifyCode()]] will always return the value of this property.
     * This is mainly used in automated tests where we want to be able to reproduce
     * the same verification code each time we run the tests.
     * If not set, it means the verification code will be randomly generated.
     */
    public $fixedVerifyCode;

    /**
     * Initializes the action.
     * @throws InvalidConfigException if the font file does not exist.
     */
    public function init()
    {
        $this->fontFile = Yii::getAlias($this->fontFile);
        if (!is_file($this->fontFile)) {
            throw new InvalidConfigException("The font file does not exist: {$this->fontFile}");
        }
    }

    /**
     * Runs the action.
     */
    public function run()
    {
        if (Yii::$app->request->getQueryParam(self::REFRESH_GET_VAR) !== null) {
            // AJAX request for regenerating code
            $code = $this->getVerifyCode(true);

            return json_encode([
                '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();

            return $this->renderImage($this->getVerifyCode());
        }
    }

    /**
     * Generates a hash code that can be used for client side validation.
     * @param  string $code the CAPTCHA code
     * @return string a hash code generated from the CAPTCHA code
     */
    public function generateValidationHash($code)
    {
        for ($h = 0, $i = strlen($code) - 1; $i >= 0; --$i) {
            $h += ord($code[$i]);
        }

        return $h;
    }

    /**
     * Gets the verification code.
     * @param  boolean $regenerate whether the verification code should be regenerated.
     * @return string  the verification code.
     */
    public function getVerifyCode($regenerate = false)
    {
        if ($this->fixedVerifyCode !== null) {
            return $this->fixedVerifyCode;
        }

        $session = Yii::$app->getSession();
        $session->open();
        $name = $this->getSessionKey();
        if ($session[$name] === null || $regenerate) {
            $session[$name] = $this->generateVerifyCode();
            $session[$name . 'count'] = 1;
        }

        return $session[$name];
    }

    /**
     * Validates the input to see if it matches the generated code.
     * @param  string  $input         user input
     * @param  boolean $caseSensitive whether the comparison should be case-sensitive
     * @return boolean whether the input is valid
     */
    public function validate($input, $caseSensitive)
    {
        $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;
    }

    /**
     * Generates a new verification code.
     * @return string the generated verification code
     */
    protected function generateVerifyCode()
    {
        if ($this->minLength > $this->maxLength) {
            $this->maxLength = $this->minLength;
        }
        if ($this->minLength < 3) {
            $this->minLength = 3;
        }
        if ($this->maxLength > 20) {
            $this->maxLength = 20;
        }
        $length = mt_rand($this->minLength, $this->maxLength);

        $letters = 'bcdfghjklmnpqrstvwxyz';
        $vowels = 'aeiou';
        $code = '';
        for ($i = 0; $i < $length; ++$i) {
            if ($i % 2 && mt_rand(0, 10) > 2 || !($i % 2) && mt_rand(0, 10) > 9) {
                $code .= $vowels[mt_rand(0, 4)];
            } else {
                $code .= $letters[mt_rand(0, 20)];
            }
        }

        return $code;
    }

    /**
     * Returns the session variable name used to store verification code.
     * @return string the session variable name
     */
    protected function getSessionKey()
    {
        return '__captcha/' . $this->getUniqueId();
    }

    /**
     * Renders the CAPTCHA image.
     * @param  string $code the verification code
     * @return string image contents
     */
    protected function renderImage($code)
    {
        if (Captcha::checkRequirements() === 'gd') {
            return $this->renderImageByGD($code);
        } else {
            return $this->renderImageByImagick($code);
        }
    }

    /**
     * Renders the CAPTCHA image based on the code using GD library.
     * @param  string $code the verification code
     * @return string image contents
     */
    protected function renderImageByGD($code)
    {
        $image = imagecreatetruecolor($this->width, $this->height);

        $backColor = imagecolorallocate($image,
            (int) ($this->backColor % 0x1000000 / 0x10000),
            (int) ($this->backColor % 0x10000 / 0x100),
            $this->backColor % 0x100);
        imagefilledrectangle($image, 0, 0, $this->width, $this->height, $backColor);
        imagecolordeallocate($image, $backColor);

        if ($this->transparent) {
            imagecolortransparent($image, $backColor);
        }

        $foreColor = imagecolorallocate($image,
            (int) ($this->foreColor % 0x1000000 / 0x10000),
            (int) ($this->foreColor % 0x10000 / 0x100),
            $this->foreColor % 0x100);

        $length = strlen($code);
        $box = imagettfbbox(30, 0, $this->fontFile, $code);
        $w = $box[4] - $box[0] + $this->offset * ($length - 1);
        $h = $box[1] - $box[5];
        $scale = min(($this->width - $this->padding * 2) / $w, ($this->height - $this->padding * 2) / $h);
        $x = 10;
        $y = round($this->height * 27 / 40);
        for ($i = 0; $i < $length; ++$i) {
            $fontSize = (int) (rand(26, 32) * $scale * 0.8);
            $angle = rand(-10, 10);
            $letter = $code[$i];
            $box = imagettftext($image, $fontSize, $angle, $x, $y, $foreColor, $this->fontFile, $letter);
            $x = $box[2] + $this->offset;
        }

        imagecolordeallocate($image, $foreColor);

        ob_start();
        imagepng($image);
        imagedestroy($image);

        return ob_get_clean();
    }

    /**
     * Renders the CAPTCHA image based on the code using ImageMagick library.
     * @param  string   $code the verification code
     * @return \Imagick image instance. Can be used as string. In this case it will contain image contents.
     */
    protected function renderImageByImagick($code)
    {
        $backColor = $this->transparent ? new \ImagickPixel('transparent') : new \ImagickPixel('#' . dechex($this->backColor));
        $foreColor = new \ImagickPixel('#' . dechex($this->foreColor));

        $image = new \Imagick();
        $image->newImage($this->width, $this->height, $backColor);

        $draw = new \ImagickDraw();
        $draw->setFont($this->fontFile);
        $draw->setFontSize(30);
        $fontMetrics = $image->queryFontMetrics($draw, $code);

        $length = strlen($code);
        $w = (int) ($fontMetrics['textWidth']) - 8 + $this->offset * ($length - 1);
        $h = (int) ($fontMetrics['textHeight']) - 8;
        $scale = min(($this->width - $this->padding * 2) / $w, ($this->height - $this->padding * 2) / $h);
        $x = 10;
        $y = round($this->height * 27 / 40);
        for ($i = 0; $i < $length; ++$i) {
            $draw = new \ImagickDraw();
            $draw->setFont($this->fontFile);
            $draw->setFontSize((int) (rand(26, 32) * $scale * 0.8));
            $draw->setFillColor($foreColor);
            $image->annotateImage($draw, $x, $y, rand(-10, 10), $code[$i]);
            $fontMetrics = $image->queryFontMetrics($draw, $code[$i]);
            $x += (int) ($fontMetrics['textWidth']) + $this->offset;
        }

        $image->setImageFormat('png');

        return $image;
    }

    /**
     * Sets the HTTP headers needed by image response.
     */
    protected function setHttpHeaders()
    {
        Yii::$app->getResponse()->getHeaders()
            ->set('Pragma', 'public')
            ->set('Expires', '0')
            ->set('Cache-Control', 'must-revalidate, post-check=0, pre-check=0')
            ->set('Content-Transfer-Encoding', 'binary')
            ->set('Content-type', 'image/png');
    }
}
