File Manager

<?php

use Imagely\NGG\DataStorage\Manager as StorageManager;

use Imagely\NGG\Util\URL;

class nggPostThumbnail {

	/**
	 * Main constructor - Add filter and action hooks
	 */
	function __construct() {

		add_filter( 'admin_post_thumbnail_html', array( $this, 'admin_post_thumbnail' ), 10, 2 );
		add_action( 'wp_ajax_ngg_set_post_thumbnail', array( $this, 'ajax_set_post_thumbnail' ) );

		// Adding filter for the new post_thumbnail
		add_filter( 'post_thumbnail_html', array( $this, 'ngg_post_thumbnail' ), 10, 5 );
	}

	/**
	 * Filter for the post meta box. look for a NGG image if the ID is "ngg-<imageID>"
	 *
	 * @param string $content
	 * @return string html output
	 */
	function admin_post_thumbnail( $content, $post_id = null ) {
		if ($post_id == null) {
			global $post;

			if ( !is_object( $post ) ) {
				return $content;
			}

			$post_id = $post->ID;
		}

		$thumbnail_id = get_post_meta( $post_id, '_thumbnail_id', true );

		// in the case it's a ngg image it return ngg-<imageID>
		if ( strpos( $thumbnail_id, 'ngg-' ) === false) {
			global $wp_version;

			if (version_compare( $wp_version, '3.5', '>=' ) && $thumbnail_id <= 0) {
				$iframe_src = get_upload_iframe_src( 'image', $post_id );
				$iframe_src = remove_query_arg( 'TB_iframe', $iframe_src );
				$iframe_src = add_query_arg( 'tab', 'nextgen', $iframe_src );
				$iframe_src = add_query_arg( 'chromeless', '1', $iframe_src );
				$iframe_src = add_query_arg( 'TB_iframe', '1', $iframe_src );

				$set_thumbnail_link = '<p class="hide-if-no-js"><a title="' . esc_attr__( 'Set NextGEN featured image', 'nggallery' ) . '" href="' . \Imagely\NGG\Util\Router::esc_url( $iframe_src ) . '" id="set-ngg-post-thumbnail" class="thickbox">%s</a></p>';
				$content           .= sprintf( $set_thumbnail_link, esc_html__( 'Set NextGEN featured image', 'nggallery' ) );
			}

			return $content;
		}

		// cut off the 'ngg-'
		$thumbnail_id = substr( $thumbnail_id, 4 );

		return $this->_wp_post_thumbnail_html( $thumbnail_id );
	}

	/**
	 * Filter for the post content
	 *
	 * @param string       $html
	 * @param int          $post_id
	 * @param int          $post_thumbnail_id
	 * @param string|array $size Optional. Image size.  Defaults to 'thumbnail'.
	 * @param string|array $attr Optional. Query string or array of attributes.
	 * @return string html output
	 */
	function ngg_post_thumbnail( $html, $post_id, $post_thumbnail_id, $size = 'post-thumbnail', $attr = '' ) {

		global $post, $_wp_additional_image_sizes;

		// in the case it's a ngg image it return ngg-<imageID>
		if ( strpos( $post_thumbnail_id, 'ngg-' ) === false) {
			return $html;
		}

		// cut off the 'ngg-'
		$post_thumbnail_id = substr( $post_thumbnail_id, 4 );

		// get the options
		$ngg_options = nggGallery::get_option( 'ngg_options' );

		// get the image data
		$image = nggdb::find_image( $post_thumbnail_id );

		if (!$image) {
			return $html;
		}

		$img_src = false;
		$class   = 'wp-post-image ngg-image-' . $image->pid . ' ';

		if (is_array( $size ) || is_array( $_wp_additional_image_sizes ) && isset( $_wp_additional_image_sizes[$size] )) {
			$class .= isset( $attr['class'] ) ? esc_attr( $attr['class'] ) : '';

			if ( is_array( $size )) {
				// the parameters is given as an array rather than a predfined image
				$width  = absint( $size[0] );
				$height = absint( $size[1] );
				if (isset( $size[2] ) && $size[2] === true) {
					$mode = 'crop';
				} elseif (isset( $size[2] )) {
					$mode = $size[2];
				} else {
					$mode = '';
				}
			} else {
				$width  = absint( $_wp_additional_image_sizes[$size]['width'] );
				$height = absint( $_wp_additional_image_sizes[$size]['height'] );
				$mode   = ( $_wp_additional_image_sizes[$size]['crop'] ) ? 'crop' : '';
			}

			// check fo cached picture
			if ( $post->post_status == 'publish' ) {
				$img_src = $image->cached_singlepic_file( $width, $height, $mode );
			}

			// if we didn't use a cached image then we take the on-the-fly mode
			if ($img_src ==  false) {
				$img_src = trailingslashit( home_url() ) . 'index.php?callback=image&amp;pid=' . $image->pid . '&amp;width=' . $width . '&amp;height=' . $height . '&amp;mode=crop';
			}

		} else {
			$img_src = $image->thumbURL;
		}

		$alttext   = isset( $attr['alt'] ) ? $attr['alt'] : $image->alttext;
		$titletext = isset( $attr['title'] ) ? $attr['title'] : $image->title;

		$html = '<img src="' . esc_attr( $img_src ) . '" alt="' . esc_attr( $alttext ) . '" title="' . esc_attr( $titletext ) . '" class="' . $class . '" />';

		return $html;
	}

	/**
	 * nggPostThumbnail::ajax_set_post_thumbnail()
	 *
	 * @return void
	 */
	function ajax_set_post_thumbnail() {
		// This function does the following:
		// 1) Check if the user is logged in and has permission to edit the post
		// 2) Get the thumbnail id from the POST request. The thumbnail id is actually the NGG image id
		// 3)]

		global $post_ID;

		// check for correct capability
		if ( ! is_user_logged_in() ) {
			die( '-1' );
		}

		if ( ! isset( $_REQUEST['nonce'] ) || ! wp_verify_nonce( $_REQUEST['nonce'], 'ngg_set_post_thumbnails' ) ) {
			die( '-1' );
		}

		// get the post id as global variable, otherwise the ajax_nonce failed later
		$post_ID = intval( $_REQUEST['post_id'] );

		if ( ! current_user_can( 'edit_post', $post_ID ) ) {
			die( '-1' );
		}

		$thumbnail_id = intval( $_REQUEST['thumbnail_id'] );

		// delete the image
		if ( $thumbnail_id == '-1' ) {
			delete_post_meta( $post_ID, '_thumbnail_id' );
			die( '1' );
		}

		if ( ( $attachment_id = StorageManager::get_instance()->set_post_thumbnail( $post_ID, $thumbnail_id, TRUE ) ) ) {
			die( strval( $attachment_id ) );
		}
		die( strval( 0 ) );
	}

	/**
	 * Output HTML for the post thumbnail meta-box.
	 *
	 * @see wp-admin\includes\post.php
	 * @param int $thumbnail_id ID of the image used for thumbnail
	 * @return string html output
	 */
	function _wp_post_thumbnail_html( $thumbnail_id = null ) {

		global $_wp_additional_image_sizes, $post_ID;

		$set_thumbnail_link = '<p class="hide-if-no-js"><a title="' . esc_attr__( 'Set featured image', 'nggallery' ) . '" href="' . \Imagely\NGG\Util\Router::esc_url( get_upload_iframe_src( 'image' ) ) . '" id="set-post-thumbnail" class="thickbox">%s</a></p>';
		$content            = sprintf( $set_thumbnail_link, esc_html__( 'Set featured image', 'nggallery' ) );

		$image   = nggdb::find_image( $thumbnail_id );
		$img_src = false;

		// get the options
		$ngg_options = nggGallery::get_option( 'ngg_options' );

		if ( $image ) {
			if ( is_array( $_wp_additional_image_sizes ) && isset( $_wp_additional_image_sizes['post-thumbnail'] ) ) {
				// Use post thumbnail settings if defined
				$width  = absint( $_wp_additional_image_sizes['post-thumbnail']['width'] );
				$height = absint( $_wp_additional_image_sizes['post-thumbnail']['height'] );
				$mode   = $_wp_additional_image_sizes['post-thumbnail']['crop'] ? 'crop' : '';
				// check fo cached picture
				$img_src = $image->cached_singlepic_file( $width, $height, $mode );
			}

			// if we didn't use a cached image then we take the on-the-fly mode
			if ( $img_src == false ) {
				$img_src = trailingslashit( home_url() ) . 'index.php?callback=image&amp;pid=' . $image->pid . '&amp;width=' . $width . '&amp;height=' . $height . '&amp;mode=crop';
			}

			$thumbnail_html = '<img width="266" src="' . $img_src . '" alt="' . $image->alttext . '" title="' . $image->alttext . '" />';

			if ( !empty( $thumbnail_html ) ) {
				$ajax_nonce = wp_create_nonce( "set_post_thumbnail-$post_ID" );
				$content    = sprintf( $set_thumbnail_link, $thumbnail_html );
				$content   .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail" onclick="WPRemoveThumbnail(\'' . $ajax_nonce . '\');return false;">' . esc_html__( 'Remove featured image' ) . '</a></p>';
			}
		}

		return $content;
	}
}

$nggPostThumbnail = new nggPostThumbnail();