add image metadata filter (1cf1f89f) · Commits · singing-chimes.co.uk / S3-Uploads

inc/class-s3-uploads.php

+111 −14

Original line number	Diff line number	Diff line
		@@ -47,6 +47,7 @@ class S3_Uploads {
		add_filter( 'upload_dir', array( $this, 'filter_upload_dir' ) );
		add_filter( 'wp_image_editors', array( $this, 'filter_editors' ), 9 );
		add_filter( 'wp_delete_file', array( $this, 'wp_filter_delete_file' ) );
		add_filter( 'wp_read_image_metadata', array( $this, 'wp_filter_read_image_metadata' ), 10, 2 );
		remove_filter( 'admin_notices', 'wpthumb_errors' );

		add_action( 'wp_handle_sideload_prefilter', array( $this, 'filter_sideload_move_temp_file_to_s3' ) );
		@@ -216,4 +217,100 @@ class S3_Uploads {

		return $file;
		}

		/**
		* Filters wp_read_image_metadata. exif_read_data() doesn't work on
		* file streams so we need to make a temporary local copy to extract
		* exif data from.
		*
		* @param array $meta Array of metadata
		* @param string $file File name on S3
		* @return array
		*/
		public function wp_filter_read_image_metadata( $meta, $file ) {

		// Get a local copy of the file
		$temp_filename = wp_tempnam( $file, 's3-uploads' );
		@ copy( $file, $temp_filename );

		$exif = @exif_read_data( $temp_filename );

		// Clean up
		@ unlink( $temp_filename );

		// Bail if the copy and exif read failed
		if ( ! $exif ) {
		return $meta;
		}

		if ( ! empty( $exif['ImageDescription'] ) ) {
		mbstring_binary_safe_encoding();
		$description_length = strlen( $exif['ImageDescription'] );
		reset_mbstring_encoding();

		if ( empty( $meta['title'] ) && $description_length < 80 ) {
		// Assume the title is stored in ImageDescription
		$meta['title'] = trim( $exif['ImageDescription'] );
		}

		if ( empty( $meta['caption'] ) && ! empty( $exif['COMPUTED']['UserComment'] ) ) {
		$meta['caption'] = trim( $exif['COMPUTED']['UserComment'] );
		}

		if ( empty( $meta['caption'] ) ) {
		$meta['caption'] = trim( $exif['ImageDescription'] );
		}
		} elseif ( empty( $meta['caption'] ) && ! empty( $exif['Comments'] ) ) {
		$meta['caption'] = trim( $exif['Comments'] );
		}

		if ( empty( $meta['credit'] ) ) {
		if ( ! empty( $exif['Artist'] ) ) {
		$meta['credit'] = trim( $exif['Artist'] );
		} elseif ( ! empty( $exif['Author'] ) ) {
		$meta['credit'] = trim( $exif['Author'] );
		}
		}

		if ( empty( $meta['copyright'] ) && ! empty( $exif['Copyright'] ) ) {
		$meta['copyright'] = trim( $exif['Copyright'] );
		}
		if ( ! empty( $exif['FNumber'] ) ) {
		$meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
		}
		if ( ! empty( $exif['Model'] ) ) {
		$meta['camera'] = trim( $exif['Model'] );
		}
		if ( empty( $meta['created_timestamp'] ) && ! empty( $exif['DateTimeDigitized'] ) ) {
		$meta['created_timestamp'] = wp_exif_date2ts( $exif['DateTimeDigitized'] );
		}
		if ( ! empty( $exif['FocalLength'] ) ) {
		$meta['focal_length'] = (string) wp_exif_frac2dec( $exif['FocalLength'] );
		}
		if ( ! empty( $exif['ISOSpeedRatings'] ) ) {
		$meta['iso'] = is_array( $exif['ISOSpeedRatings'] ) ? reset( $exif['ISOSpeedRatings'] ) : $exif['ISOSpeedRatings'];
		$meta['iso'] = trim( $meta['iso'] );
		}
		if ( ! empty( $exif['ExposureTime'] ) ) {
		$meta['shutter_speed'] = (string) wp_exif_frac2dec( $exif['ExposureTime'] );
		}
		if ( ! empty( $exif['Orientation'] ) ) {
		$meta['orientation'] = $exif['Orientation'];
		}


		foreach ( array( 'title', 'caption', 'credit', 'copyright', 'camera', 'iso' ) as $key ) {
		if ( $meta[ $key ] && ! seems_utf8( $meta[ $key ] ) ) {
		$meta[ $key ] = utf8_encode( $meta[ $key ] );
		}
		}

		foreach ( $meta['keywords'] as $key => $keyword ) {
		if ( ! seems_utf8( $keyword ) ) {
		$meta['keywords'][ $key ] = utf8_encode( $keyword );
		}
		}

		return $meta;
		}
		}