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Current File : /srv/wp/nallaram.agtdemo.in/www/wp-content/plugins/envira-gallery-lite/includes/admin/media.php
<?php
/**
 * Media class.
 *
 * @since 1.0.0
 *
 * @package Envira_Gallery
 * @author  Envira Gallery Team
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Media Helper Class
 *
 * @since 1.0.0
 */
class Envira_Gallery_Media {

	/**
	 * Holds the class object.
	 *
	 * @since 1.0.0
	 *
	 * @var object
	 */
	public static $instance;

	/**
	 * Path to the file.
	 *
	 * @since 1.0.0
	 *
	 * @var string
	 */
	public $file = __FILE__;

	/**
	 * Holds the base class object.
	 *
	 * @since 1.0.0
	 *
	 * @var object
	 */
	public $base;

	/**
	 * Primary class constructor.
	 *
	 * @since 1.0.0
	 */
	public function __construct() {

		// Load the base class object.
		$this->base = Envira_Gallery_Lite::get_instance();

		add_filter( 'wp_handle_upload', [ $this, 'fix_image_orientation' ] );
	}

	/**
	 * Check if the EXIF orientation flag matches one of the values we're looking for
	 * http://www.impulseadventure.com/photo/exif-orientation.html
	 *
	 * If it does, this means we need to rotate the image based on the orientation flag and then remove the flag.
	 * This will ensure the image has the correct orientation, regardless of where it's displayed.
	 *
	 * Whilst most browsers and applications will read this flag to perform the rotation on displaying just the image, it's
	 * not possible to do this in some situations e.g. displaying an image within a lightbox, or when the image is
	 * within HTML markup.
	 *
	 * Orientation flags we're looking for:
	 * 8: We need to rotate the image 90 degrees counter-clockwise
	 * 3: We need to rotate the image 180 degrees
	 * 6: We need to rotate the image 90 degrees clockwise (270 degrees counter-clockwise)
	 *
	 * @since 1.3.8.2
	 *
	 * @param array $file    Uploaded File.
	 * @return array         Uploaded File.
	 */
	public function fix_image_orientation( $file ) {

		// Check we have a file.
		if ( ! file_exists( $file['file'] ) ) {
			return $file;
		}

		// Check we have a JPEG.
		if ( 'image/jpg' !== $file['type'] && 'image/jpeg' !== $file['type'] ) {
			return $file;
		}

		// Attempt to read EXIF data from the image.
		$exif_data = wp_read_image_metadata( $file['file'] );
		if ( ! $exif_data ) {
			return $file;
		}

		// Check if an orientation flag exists.
		if ( ! isset( $exif_data['orientation'] ) ) {
			return $file;
		}

		// Check if the orientation flag matches one we're looking for.
		$required_orientations = [ 8, 3, 6 ];
		if ( ! in_array( $exif_data['orientation'], $required_orientations, true ) ) {
			return $file;
		}

		// If here, the orientation flag matches one we're looking for.
		// Load the WordPress Image Editor class.
		$image = wp_get_image_editor( $file['file'] );
		if ( is_wp_error( $image ) ) {
			// Something went wrong - abort.
			return $file;
		}

		// Store the source image EXIF and IPTC data in a variable, which we'll write.
		// back to the image once its orientation has changed.
		// This is required because when we save an image, it'll lose its metadata.
		$source_size = getimagesize( $file['file'], $image_info );

		// Depending on the orientation flag, rotate the image.
		switch ( $exif_data['orientation'] ) {

			/**
			* Rotate 90 degrees counter-clockwise.
			*/
			case 8:
				$image->rotate( 90 );
				break;

			/**
			* Rotate 180 degrees.
			*/
			case 3:
				$image->rotate( 180 );
				break;

			/**
			* Rotate 270 degrees counter-clockwise ($image->rotate always works counter-clockwise).
			*/
			case 6:
				$image->rotate( 270 );
				break;

		}

		// Save the image, overwriting the existing image.
		// This will discard the EXIF and IPTC data.
		$image->save( $file['file'] );

		// Drop the EXIF orientation flag, otherwise applications will try to rotate the image.
		// before display it, and we don't need that to happen as we've corrected the orientation.

		// Write the EXIF and IPTC metadata to the revised image.
		$result = $this->transfer_iptc_exif_to_image( $image_info, $file['file'], $exif_data['orientation'] );
		if ( ! $result ) {
			return $file;
		}

		// Read the image again to see if the EXIF data was preserved.
		$exif_data = wp_read_image_metadata( $file['file'] );

		// Finally, return the data that's expected.
		return $file;
	}

	/**
	 * Transfers IPTC and EXIF data from a source image which contains either/both,
	 * and saves it into a destination image's headers that might not have this IPTC
	 * or EXIF data
	 *
	 * Useful for when you edit an image through PHP and need to preserve IPTC and EXIF
	 * data
	 *
	 * @since 1.3.8.2
	 *
	 * @source http://php.net/iptcembed - ebashkoff at gmail dot com
	 *
	 * @param string $image_info             EXIF and IPTC image information from the source image, using getimagesize().
	 * @param string $destination_image      Path and File of Destination Image, which needs IPTC and EXIF data.
	 * @param int    $original_orientation   The image's original orientation, before we changed it.
	 *                                       Used when we replace this orientation in the EXIF data.
	 * @return bool                          Success
	 */
	private function transfer_iptc_exif_to_image( $image_info, $destination_image, $original_orientation ) {

		// Check destination exists.
		if ( ! file_exists( $destination_image ) ) {
			return false;
		}

		// Get EXIF data from the image info, and create the IPTC segment.
		$exif_data = ( ( is_array( $image_info ) && key_exists( 'APP1', $image_info ) ) ? $image_info['APP1'] : null );
		if ( $exif_data ) {
			// Find the image's original orientation flag, and change it to 1.
			// This prevents applications and browsers re-rotating the image, when we've already performed that function.
			$exif_data = str_replace( chr( dechex( $original_orientation ) ), chr( 0x1 ), $exif_data );

			$exif_length = strlen( $exif_data ) + 2;
			if ( $exif_length > 0xFFFF ) {
				return false;
			}

			// Construct EXIF segment.
			$exif_data = chr( 0xFF ) . chr( 0xE1 ) . chr( ( $exif_length >> 8 ) & 0xFF ) . chr( $exif_length & 0xFF ) . $exif_data;
		}

		// Get IPTC data from the source image, and create the IPTC segment.
		$iptc_data = ( ( is_array( $image_info ) && key_exists( 'APP13', $image_info ) ) ? $image_info['APP13'] : null );
		if ( $iptc_data ) {
			$iptc_length = strlen( $iptc_data ) + 2;
			if ( $iptc_length > 0xFFFF ) {
				return false;
			}

			// Construct IPTC segment.
			$iptc_data = chr( 0xFF ) . chr( 0xED ) . chr( ( $iptc_length >> 8 ) & 0xFF ) . chr( $iptc_length & 0xFF ) . $iptc_data;
		}

		// Get the contents of the destination image.
		$destination_image_contents = file_get_contents( $destination_image );
		if ( ! $destination_image_contents ) {
			return false;
		}
		if ( strlen( $destination_image_contents ) === 0 ) {
			return false;
		}

		// Build the EXIF and IPTC data headers.
		$destination_image_contents = substr( $destination_image_contents, 2 );
		$portion_to_add             = chr( 0xFF ) . chr( 0xD8 ); // Variable accumulates new & original IPTC application segments.
		$exif_added                 = ! $exif_data;
		$iptc_added                 = ! $iptc_data;

		while ( ( substr( $destination_image_contents, 0, 2 ) && 0xFFF0 ) === 0xFFE0 ) {
			$segment_length      = ( substr( $destination_image_contents, 2, 2 ) & 0xFFFF );
			$iptc_segment_number = ( substr( $destination_image_contents, 1, 1 ) & 0x0F );   // Last 4 bits of second byte is IPTC segment #.
			if ( $segment_length <= 2 ) {
				return false;
			}

			$thisexistingsegment = substr( $destination_image_contents, 0, $segment_length + 2 );
			if ( ( 1 <= $iptc_segment_number ) && ( ! $exif_added ) ) {
				$portion_to_add .= $exif_data;
				$exif_added      = true;
				if ( 1 === $iptc_segment_number ) {
					$thisexistingsegment = '';
				}
			}

			if ( ( 13 <= $iptc_segment_number ) && ( ! $iptc_added ) ) {
				$portion_to_add .= $iptc_data;
				$iptc_added      = true;
				if ( 13 === $iptc_segment_number ) {
					$thisexistingsegment = '';
				}
			}

			$portion_to_add            .= $thisexistingsegment;
			$destination_image_contents = substr( $destination_image_contents, $segment_length + 2 );
		}

		// Write the EXIF and IPTC data to the new file.
		if ( ! $exif_added ) {
			$portion_to_add .= $exif_data;
		}
		if ( ! $iptc_added ) {
			$portion_to_add .= $iptc_data;
		}

		$output_file = fopen( $destination_image, 'w' ); // @codingStandardsIgnoreLine - !!! TODO migrate to WP filesystem
		if ( $output_file ) {
			return fwrite( $output_file, $portion_to_add . $destination_image_contents ); // @codingStandardsIgnoreLine - !!! TODO migrate to WP filesystem
		}

		return false;
	}

	/**
	 * Returns the singleton instance of the class.
	 *
	 * @since 1.0.0
	 *
	 * @return object The Envira_Gallery_Media object.
	 */
	public static function get_instance() {

		if ( ! isset( self::$instance ) && ! ( self::$instance instanceof Envira_Gallery_Media ) ) {
			self::$instance = new Envira_Gallery_Media();
		}

		return self::$instance;
	}
}

// Load the media class.
$envira_gallery_media = Envira_Gallery_Media::get_instance();

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