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components/artboximage/ArtboxImageHelper.php 5.93 KB
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  <?php
      
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      namespace artweb\artbox\components\artboximage;
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      use Yii;
      use yii\base\Object;
      use yii\helpers\Html;
      
      class ArtboxImageHelper extends Object
      {
          
          /**
           * @var  ArtboxImage $imageDriver
           */
          private static $imageDriver;
          
          /**
           * @var array $presets
           */
          private static $presets;
          
          /**
           * Get image manipulation driver
           *
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           * @return \artweb\artbox\components\artboximage\ArtboxImage
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           */
          public static function getDriver()
          {
              if (empty( self::$imageDriver )) {
                  self::$imageDriver = Yii::$app->get('artboximage');
              }
              return self::$imageDriver;
          }
          
          /**
           * Get named preset from driver preset list.
           *
           * @param string $preset
           *
           * @return array|null
           */
          public static function getPreset($preset)
          {
              if (empty( self::$presets )) {
                  self::$presets = self::getDriver()->presets;
              }
              return empty( self::$presets[ $preset ] ) ? null : self::$presets[ $preset ];
          }
          
          /**
           * Get image HTML for image
           *
           * @param string       $file
           * @param array|string $preset
           * @param array        $imgOptions
           *
           * @see Html::img()
           * @return string
           */
          public static function getImage($file, $preset, $imgOptions = [])
          {
              $preset_alias = is_array($preset) ? array_keys($preset)[ 0 ] : null;
              return Html::img(self::getImageSrc($file, $preset, $preset_alias), $imgOptions);
          }
          
          /**
           * Get src for image
           *
           * @param string      $file
           * @param string      $preset
           * @param null|string $preset_alias
           *
           * @return bool|string
           */
          public static function getImageSrc($file, $preset, $preset_alias = null)
          {
              if (is_string($preset)) {
                  $preset_alias = $preset;
                  $preset = self::getPreset($preset);
              }
              if (empty( $preset ) || empty( $preset_alias )) {
                  return $file;
              }
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              $filePath = self::getPathFromUrl($file);
              if (!file_exists($filePath) || !preg_match(
                      '#^(.*)\.(' . self::getExtensionsRegexp() . ')$#',
                      $file,
                      $matches
                  )
              ) {
                  return $file;
              }
              return self::getPresetUrl($filePath, $preset, $preset_alias);
          }
          
          /**
           * Replace web path with file path
           *
           * @param string $url
           *
           * @return string
           */
          private static function getPathFromUrl($url)
          {
              return substr_replace($url, self::getDriver()->rootPath, 0, strlen(self::getDriver()->rootUrl));
          }
          
          /**
           * Replace file path with web path
           *
           * @param string $path
           *
           * @return string
           */
          private static function getUrlFromPath($path)
          {
              return substr_replace($path, self::getDriver()->rootUrl, 0, strlen(self::getDriver()->rootPath));
          }
          
          /**
           * Get formatted file url or create it if not exist
           *
           * @param string $filePath
           * @param array  $preset
           * @param string $preset_alias
           *
           * @return bool|string
           */
          private static function getPresetUrl($filePath, $preset, $preset_alias)
          {
              $pathinfo = pathinfo($filePath);
              $presetPath = $pathinfo[ 'dirname' ] . '/styles/' . strtolower($preset_alias);
              $presetFilePath = $presetPath . '/' . $pathinfo[ 'basename' ];
              $presetUrl = self::getUrlFromPath($presetFilePath);
              if (file_exists($presetFilePath)) {
                  return $presetUrl;
              }
              if (!file_exists($presetPath)) {
                  @mkdir($presetPath, 0777, true);
              }
              $output = self::createPresetImage($filePath, $preset, $preset_alias);
              if (!empty( $output )) {
                  $f = fopen($presetFilePath, 'w');
                  fwrite($f, $output);
                  fclose($f);
                  return $presetUrl;
              }
              return false;
          }
          
          /**
           * Create formatted image.
           * Available manipulations:
           * * resize
           * * flip
           *
           * @param string $filePath
           * @param array  $preset
           * @param string $preset_alias
           *
           * @return string
           */
          private static function createPresetImage($filePath, $preset, $preset_alias)
          {
              $image = self::getDriver()
                           ->load($filePath);
              foreach ($preset as $action => $data) {
                  switch ($action) {
                      case 'resize':
                          $width = empty( $data[ 'width' ] ) ? null : $data[ 'width' ];
                          $height = empty( $data[ 'height' ] ) ? null : $data[ 'height' ];
                          $master = empty( $data[ 'master' ] ) ? null : $data[ 'master' ];
                          $image->resize($width, $height, $master);
                          break;
                      case 'flip':
                          $image->flip(@$data[ 'direction' ]);
                          break;
                      default:
                          break;
                  }
              }
              return $image->render();
          }
          
          /**
           * Get extensions regexp
           *
           * @return string regexp
           */
          private static function getExtensionsRegexp()
          {
              $keys = array_keys(self::getDriver()->extensions);
              return '(?i)' . join('|', $keys);
          }
      }