roi-theme/wp-content/plugins/PDFEmbedder-premium-secure/secure_pdf_embedder.php

<?php
/**
 * Plugin Name: PDF Embedder Premium Secure
 * Plugin URI: http://wp-pdf.com/
 * Description: Embed secure undownloadable PDFs straight into your posts and pages, with flexible width and height. No third-party services required.
 * Version: 5.1.4
 * Author: PDF Embedder Team
 * Author URI: http://wp-pdf.com/
 * Text Domain: pdf-embedder
 * License: Premium Paid per WordPress site
 *
 * Do not copy, modify, or redistribute without authorization from author Lesterland Ltd (contact@wp-pdf.com)
 *
 * You need to have purchased a license to install this software on each website.
 *
 * You are not authorized to use, modify, or distribute this software beyond the single site license(s) that you
 * have purchased.
 *
 * You must not remove or alter any copyright notices on any and all copies of this software.
 *
 * This software is NOT licensed under one of the public "open source" licenses you may be used to on the web.
 *
 * For full license details, and to understand your rights, please refer to the agreement you made when you purchased it
 * from our website at https://wp-pdf.com/
 *
 * THIS SOFTWARE IS SUPPLIED "AS-IS" AND THE LIABILITY OF THE AUTHOR IS STRICTLY LIMITED TO THE PURCHASE PRICE YOU PAID
 * FOR YOUR LICENSE.
 *
 * Please report violations to contact@wp-pdf.com
 *
 * Copyright LionShare Technologies, registered company in the United States of America
 *
 * @since 1.0.0
 *
 * @package WP-PDF-Secure
 */

require_once plugin_dir_path( __FILE__ ) . '/core/commercial_pdf_embedder.php';

if ( class_exists( 'WP_PDF_Commercial' ) ) {

	/**
	 * PDFEmb Secure Core Class.
	 *
	 * @since 5.1.0
	 */
	final class WP_PDF_Secure extends WP_PDF_Commercial {

		/**
		 * Singleton Instance
		 *
		 * @var object
		 */
		private static $instance = null;

		/**
		 * Plugin Version
		 *
		 * @var string
		 */
		protected $plugin_version = '5.1.4';

		/**
		 * Store Url
		 *
		 * @var string
		 */
		protected $wppdf_store_url = 'http://wp-pdf.com/';

		/**
		 * Item Name
		 *
		 * @var string
		 */
		protected $wppdf_item_name = 'PDF Embedder Secure';

		/**
		 * WP PDF Item
		 *
		 * @var int
		 */
		protected $wppdf_item_id = 17;

		/**
		 * Secure Uploader
		 *
		 * @var [type]
		 */
		protected $secure_uploader = null;

		/**
		 * Undocumented variable
		 *
		 * @var string
		 */
		protected static $poweredby_optionname = 'poweredby';

		/**
		 * Activation Hook
		 *
		 * @param bool $network_wide Network wide check.
		 * @return void
		 */
		public function pdfemb_activation_hook( $network_wide ) {

			$su = $this->get_SecureUploader();
			$su->create_protection_files( true );
			parent::pdfemb_activation_hook( $network_wide );

			$old_options = get_site_option( self::self_option_name() );

			if ( ! $old_options ) {
				update_site_option( self::$poweredby_optionname, 'off' );
			}

			$activation_time = get_option( 'wppdf_emb_activation', false );

			if ( ! $activation_time ) {
				update_option( 'wppdf_emb_activation', time() );
			}

		}

		/**
		 * Helper Method to get translations array
		 *
		 * @return array
		 */
		protected function get_translation_array() {

			$su = $this->get_SecureUploader();

			$options = $this->get_option_pdfemb();

			return array_merge(
				parent::get_translation_array(),
				array(
					'k'                       => $su->get_secret_key(),
					'is_admin'                => ( current_user_can( 'manage_options' ) ),
					'ajaxurl'                 => admin_url( 'admin-ajax.php' ),
					'watermark_map'           => apply_filters( 'pdfemb_watermark_map', $this->calculate_watermark_map() ),
					'watermark_evenpagesonly' => $options['pdfemb_wm_evenpages'],
				)
			);
		}

		/**
		 * Watermark Map Calculator
		 *
		 * @return array
		 */
		protected function calculate_watermark_map() {
			$options = $this->get_option_pdfemb();

			$text_array = preg_split( '/(\r\n|\n\r|\n|\r)/', $options['pdfemb_wm_text'], -1 );

			if ( count( $text_array ) === 0 ) {
				return array();
			}

			$notloggedin_text = __( 'Not logged in', 'pdf-embedder' );
			$var_names        = array( '{fullname}', '{username}', '{email}' );
			$var_values       = array( $notloggedin_text, $notloggedin_text, $notloggedin_text );

			$current_user = wp_get_current_user();
			if ( ( $current_user instanceof WP_User ) && $current_user->ID ) {
				$var_values = array(
					$current_user->first_name . ' ' . $current_user->last_name,
					$current_user->user_login,
					$current_user->user_email,
				);
			}

			$var_names  = apply_filters( 'pdfemb_watermark_var_names', $var_names );
			$var_values = apply_filters( 'pdfemb_watermark_var_values', $var_values );

			$watermark_map = array();
			$fontsize      = $this->int_or_default( $options['pdfemb_wm_fontsize'], 20 );

			$voffset   = $this->int_or_default( $options['pdfemb_wm_voffset'], 30 );
			$cssstyles = array(
				'globalAlpha' => $this->int_or_default( $options['pdfemb_wm_opacity'], 20 ) / 100,
			);
			foreach ( $text_array as $text ) {
				$watermark_map[] = array(
					str_replace( $var_names, $var_values, $text ),
					5,
					$voffset,
					$options['pdfemb_wm_halign'],
					$options['pdfemb_wm_rotate'],
					$fontsize,
					$cssstyles,
				);

				$voffset += $fontsize / 6.5;
			}

			return $watermark_map;
		}

		/**
		 * Int or Default.
		 *
		 * @param mixed $val Value.
		 * @param mixed $default Default Option.
		 * @return mixed
		 */
		protected function int_or_default( $val, $default ) {
			if ( is_numeric( $val ) ) {
				return intval( $val );
			}
			return $default;
		}

		/**
		 * Modify PDF Url.
		 *
		 * @param string $url Url.
		 * @return string
		 */
		protected function modify_pdfurl( $url ) {

			$su = $this->get_SecureUploader();

			$securepdfpath = $su->get_secure_path( $url );

			if ( '' !== $securepdfpath ) {
				// Turn into a secure version of the URL.
				$url = wp_parse_url( home_url( '/' ), PHP_URL_PATH ) . '?pdfemb-serveurl=' . rawurlencode( $url );
			}

			return parent::modify_pdfurl( $url );
		}

		/**
		 * Admin Init.
		 *
		 * @return void
		 */
		public function pdfemb_admin_init() {
			parent::pdfemb_admin_init();
			$su = $this->get_SecureUploader();
			$su->intercept_uploads();
			$su->create_protection_files( false );

			// For PDF Thumbnails mainly.
			add_filter( 'pdfth_pdf_direct_download_url', array( $this, 'pdfth_pdf_direct_download_url' ), 1, 10 );
			add_filter( 'pdfth_pdf_is_secure', array( $this, 'pdfth_pdf_is_secure' ), 2, 10 );
		}

		/**
		 * Init.
		 *
		 * @return void
		 */
		public function pdfemb_init() {
			$su = $this->get_SecureUploader();
			$su->handle_downloads();
			parent::pdfemb_init();
		}

		/**
		 * Undocumented function
		 *
		 * @return object
		 */
		public function get_SecureUploader() {
			if ( is_null( $this->secure_uploader ) ) {
				include_once dirname( __FILE__ ) . '/core/secure/uploads.php';
					$options           = $this->get_option_pdfemb();
				$this->secure_uploader = new WP_PDF_Secure_Uploader( $options['pdfemb_secure'], $options['pdfemb_cacheencrypted'] );
			}
			return $this->secure_uploader;
		}

		/**
		 * Extra Shortcode Atts
		 *
		 * @param array  $atts Shortcode atts.
		 * @param string $content Content.
		 * @return string
		 */
		protected function extra_shortcode_attrs( $atts, $content = null ) {

			$options = $this->get_option_pdfemb();

			$securemore             = '';
			$disablerightclick_html = '';

			if ( isset( $atts['url'] ) ) {

				$su = $this->get_SecureUploader();

				$securepdfpath = $su->get_secure_path( $atts['url'] );

				if ( '' !== $securepdfpath ) {
					// Is a secure PDF.
					$download = isset( $atts['download'] ) ? $atts['download'] : ( isset( $options['pdfemb_download'] ) && $options['pdfemb_download'] ? 'on' : 'off' );
					if ( ! in_array( $download, array( 'on', 'off' ), true ) ) {
						$download = 'off';
					}

					if ( 'on' === $download ) {
							$securemore = ' data-download-nonce="' . wp_create_nonce( 'pdfemb-secure-download-' . $atts['url'] ) . '"';
					}

					$disablerightclick = isset( $atts['disablerightclick'] ) ? $atts['disablerightclick'] : ( isset( $options['pdfemb_disablerightclick'] ) && $options['pdfemb_disablerightclick'] ? 'on' : 'off' );
					if ( ! in_array( $disablerightclick, array( 'on', 'off' ), true ) ) {
						$disablerightclick = 'off';
					}

					if ( 'on' === $disablerightclick ) {
						$disablerightclick_html = ' data-disablerightclick="on"';
					}
				}
			}

			return parent::extra_shortcode_attrs( $atts, $content ) . $securemore . $disablerightclick_html;
		}

		/**
		 * Helper method for output content.
		 *
		 * @param string $pdfurl PDF Url.
		 * @return string
		 */
		protected function output_the_content( $pdfurl ) {
			$options = $this->get_option_pdfemb();
			if ( ! $options['pdfemb_secureattpages'] && $this->is_secure( $pdfurl ) ) {
				$content = '<p>' . esc_html__( 'Attachment Pages are disabled for secure PDFs (your admin can enable them in the Secure tab of PDF Embedder settings).', 'pdf-embedder' ) . '</p>';
			} else {
				$content = parent::output_the_content( $pdfurl );
			}
			return $content;
		}

		/**
		 * Is url Secure
		 *
		 * @param string $pdfurl PDF Url.
		 * @return bool
		 */
		protected function is_secure( $pdfurl ) {
			$su            = $this->get_SecureUploader();
			$securepdfpath = $su->get_secure_path( $pdfurl );
			return '' !== $securepdfpath;
		}

		/**
		 * Direct downloaad URl.
		 *
		 * @param string $pdfurl PDF Url.
		 * @return string
		 */
		public function pdfth_pdf_direct_download_url( $pdfurl ) {

			$su            = $this->get_SecureUploader();
			$securepdfpath = $su->get_secure_path( $pdfurl );

			if ( '' !== $securepdfpath ) {
				$pdfurl = wp_parse_url( home_url( '/' ), PHP_URL_PATH ) . '?pdfemb-serveurl=' . rawurlencode( $pdfurl ) . '&pdfemb-nonce=' . wp_create_nonce( 'pdfemb-secure-download-' . $pdfurl );
			}

			return $pdfurl;
		}

		/**
		 * Undocumented function
		 *
		 * @param string $pdfurl PDF url.
		 * @return boolean
		 */
		public function pdfth_pdf_is_secure( $pdfurl ) {

			$su            = $this->get_SecureUploader();
			$securepdfpath = $su->get_secure_path( $pdfurl );

			return '' !== $securepdfpath;

		}

		/**
		 * Undocumented function
		 *
		 * @return void
		 */
		protected function pdfemb_securesection_text() {
			$options = $this->get_option_pdfemb();
			?>

			<h2><?php esc_html_e( 'Secure PDFs', 'pdf-embedder' ); ?></h2>

			<p><?php esc_html_e( 'Your server must be running Apache and supporting .htaccess rules to restrict access to files.', 'pdf-embedder' ); ?></p>

			<label for="pdfemb_secure" class="textinput"><?php esc_html_e( 'Secure PDFs', 'pdf-embedder' ); ?></label>

			<span>
					<input type="checkbox" name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_secure]' id='pdfemb_secure' class='checkbox' <?php checked( boolval( $options['pdfemb_secure'] ), 1 ); ?> />
					<label for="pdfemb_secure" class="checkbox plain"><?php esc_html_e( "Send new PDF media uploads to 'securepdfs' folder", 'pdf-embedder' ); ?></label>
			</span>

			<br class="clear" />


			<label for="pdfemb_disablerightclick" class="textinput"><?php esc_html_e( 'Disable Right Click', 'pdf-embedder' ); ?></label>
			<span>
					<input type="checkbox" name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_disablerightclick]' id='pdfemb_disablerightclick' class='checkbox' <?php checked( boolval( $options['pdfemb_disablerightclick'] ), 1 ); ?> />
					<label for="pdfemb_disablerightclick" class="checkbox plain"><?php esc_html_e( 'Disable right-click mouse menu (affects secure PDFs only)', 'pdf-embedder' ); ?></label>
			</span>

			<br class="clear" />

			<label for="pdfemb_cacheencrypted" class="textinput"><?php esc_html_e( 'Cache Encrypted PDFs', 'pdf-embedder' ); ?></label>
			<span>
					<input type="checkbox" name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_cacheencrypted]' id='pdfemb_cacheencrypted' class='checkbox' <?php checked( boolval( $options['pdfemb_cacheencrypted'] ), 1 ); ?> />
					<label for="pdfemb_cacheencrypted" class="checkbox plain"><?php esc_html_e( 'Cache encrypted versions of secure PDFs on the server (increase download speed)', 'pdf-embedder' ); ?></label>
			</span>

			<br class="clear" />

			<label for="pdfemb_secureattpages" class="textinput"><?php esc_html_e( 'Attachment Pages', 'pdf-embedder' ); ?></label>
			<span>
					<input type="checkbox" name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_secureattpages]' id='pdfemb_secureattpages' class='checkbox' <?php checked( boolval( $options['pdfemb_secureattpages'] ), 1 ); ?> />
					<label for="pdfemb_secureattpages" class="checkbox plain"><?php esc_html_e( 'Auto-generate Attachment Pages for Secure PDFs', 'pdf-embedder' ); ?></label>
			</span>

			<br class="clear" />
			<br class="clear" />

			<h2><?php esc_html_e( 'Watermark', 'pdf-embedder' ); ?></h2>

			<label for="pdfemb_wm_text" class="textinput"><?php esc_html_e( 'Text to display on secure PDFs', 'pdf-embedder' ); ?></label>
			<textarea id='pdfemb_wm_text' class='textinput' name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_wm_text]'><?php echo wp_kses_post( htmlentities( $options['pdfemb_wm_text'] ) ); ?></textarea>
			<br class="clear"/>

			<p class="desc big"><i><?php esc_html_e( 'Leave blank for no watermark on secure PDFs.', 'pdf-embedder' ); ?>
			<br /><?php esc_html_e( 'Variables you can use in the text (from a logged in user, otherwise will be blank): {fullname}, {username}, {email}', 'pdf-embedder' ); ?></i></p>

			<label for="pdfemb_wm_halign" class="textinput"><?php esc_html_e( 'Horizontal alignment', 'pdf-embedder' ); ?></label>
			<select name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_wm_halign]' id='pdfemb_wm_halign' class='select'>
				<option value="left" <?php echo 'left' === $options['pdfemb_wm_halign'] ? 'selected' : ''; ?>><?php esc_html_e( 'Left', 'pdf-embedder' ); ?></option>
				<option value="center" <?php echo 'center' === $options['pdfemb_wm_halign'] ? 'selected' : ''; ?>><?php esc_html_e( 'Center', 'pdf-embedder' ); ?></option>
				<option value="right" <?php echo 'right' === $options['pdfemb_wm_halign'] ? 'selected' : ''; ?>><?php esc_html_e( 'Right', 'pdf-embedder' ); ?></option>
			</select>

			<br class="clear"/>

			<label for="pdfemb_wm_voffset" class="textinput"><?php esc_html_e( 'Vertical offset (%)', 'pdf-embedder' ); ?></label>
			<input id='pdfemb_wm_voffset' class='textinput' name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_wm_voffset]' size='10' type='text' value='<?php echo esc_attr( $options['pdfemb_wm_voffset'] ); ?>' />

			<br class="clear"/>

			<label for="pdfemb_wm_fontsize" class="textinput"><?php esc_html_e( 'Font Size (pt)', 'pdf-embedder' ); ?></label>
			<input id='pdfemb_wm_fontsize' class='textinput' name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_wm_fontsize]' size='10' type='text' value='<?php echo esc_attr( $options['pdfemb_wm_fontsize'] ); ?>' />

			<br class="clear"/>

			<label for="pdfemb_wm_opacity" class="textinput"><?php esc_html_e( 'Opacity (%)', 'pdf-embedder' ); ?></label>
			<input id='pdfemb_wm_opacity' class='textinput' name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_wm_opacity]' size='10' type='text' value='<?php echo esc_attr( $options['pdfemb_wm_opacity'] ); ?>' />

			<br class="clear"/>

			<label for="pdfemb_wm_rotate" class="textinput"><?php esc_html_e( 'Rotation (degrees)', 'pdf-embedder' ); ?></label>
			<input id='pdfemb_wm_rotate' class='textinput' name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_wm_rotate]' size='10' type='text' value='<?php echo esc_attr( $options['pdfemb_wm_rotate'] ); ?>' />

			<br class="clear"/>

			<label for="pdfemb_wm_evenpages" class="textinput"><?php esc_html_e( 'Page Display', 'pdf-embedder' ); ?></label>
			<span>
					<input type="checkbox" name='<?php echo esc_attr( $this->get_options_name() ); ?>[pdfemb_wm_evenpages]' id='pdfemb_wm_evenpages' class='checkbox' <?php echo $options['pdfemb_wm_evenpages'] ? 'checked' : ''; ?> />
					<label for="pdfemb_wm_evenpages" class="checkbox plain"><?php esc_html_e( 'Show only on even page numbers', 'pdf-embedder' ); ?></label>
			</span>

			<br class="clear"/>
			<br class="clear"/>

			<hr />

			<p>
			<?php
			esc_html_e(
				"If 'Secure PDFs' is checked above, your PDF uploads will be 'secure' by default.
               That is, they should be uploaded to a 'securepdfs' sub-folder of your uploads area. These files should not be accessible directly,
               and the plugin provides a backdoor method for the embedded viewer to obtain the file contents.",
				'pdf-embedder'
			);
			?>
				</p>

			<p>
			<?php
			esc_html_e(
				'This means that your PDF is unlikely to be shared outside your site where you have no control over who views, prints, or shares it.
               Please note that it is still always possible for a determined user to obtain the original file. Sensitive information should never be presented to viewers in any form.',
				'pdf-embedder'
			);
			?>
				</p>

			<p><?php esc_html_e( 'See <a href="http://wp-pdf.com/secure-instructions/?utm_source=PDF%20Settings%20Secure&utm_medium=premium&utm_campaign=Premium" target="_blank">Instructions</a> for more details.', 'pdf-embedder' ); ?></p>

			<?php
		}

		/**
		 * Helper method to get eddsl option name.
		 *
		 * @return string
		 */
		protected function get_eddsl_optname() {
			return 'eddsl_pdfemb_secure_ls';
		}

		/**
		 * Hellper Method to get default options.
		 *
		 * @return array
		 */
		protected function get_default_options() {
			return array_merge(
				parent::get_default_options(),
				array(
					'pdfemb_download'          => 'off',
					'pdfemb_secure'            => true,
					'pdfemb_disablerightclick' => 'off',
					'pdfemb_secureattpages'    => false,
					'pdfemb_cacheencrypted'    => true,
					'pdfemb_wm_text'           => '',
					'pdfemb_wm_halign'         => 'center',
					'pdfemb_wm_voffset'        => '30',
					'pdfemb_wm_fontsize'       => '20',
					'pdfemb_wm_opacity'        => '20',
					'pdfemb_wm_rotate'         => '35',
					'pdfemb_wm_evenpages'      => false,
				)
			);
		}

		/**
		 * Helper Method ti vakudate iotuib
		 *
		 * @param mixed $input Option input.
		 * @return array
		 */
		public function pdfemb_options_validate( $input ) {
			$newinput = parent::pdfemb_options_validate( $input );

			$newinput['pdfemb_secure']            = isset( $input['pdfemb_secure'] ) && ( true === $input['pdfemb_secure'] || 'on' === $input['pdfemb_secure'] );
			$newinput['pdfemb_disablerightclick'] = isset( $input['pdfemb_disablerightclick'] ) && ( true === $input['pdfemb_disablerightclick'] || 'on' === $input['pdfemb_disablerightclick'] );

			$newinput['pdfemb_cacheencrypted'] = isset( $input['pdfemb_cacheencrypted'] ) && ( true === $input['pdfemb_cacheencrypted'] || 'on' === $input['pdfemb_cacheencrypted'] );

			$newinput['pdfemb_secureattpages'] = isset( $input['pdfemb_secureattpages'] ) && ( true === $input['pdfemb_secureattpages'] || 'on' === $input['pdfemb_secureattpages'] );

			$newinput['pdfemb_wm_text'] = isset( $input['pdfemb_wm_text'] ) && ! preg_match( '/^[\n\r ]+$/', $input['pdfemb_wm_text'] ) ? $input['pdfemb_wm_text'] : '';

			if ( isset( $input['pdfemb_wm_halign'] ) && in_array( $input['pdfemb_wm_halign'], array( 'left', 'center', 'right' ), true ) ) {
				$newinput['pdfemb_wm_halign'] = $input['pdfemb_wm_halign'];
			} else {
				$newinput['pdfemb_wm_halign'] = 'center';
			}

			$newinput['pdfemb_wm_voffset'] = isset( $input['pdfemb_wm_voffset'] ) ? $input['pdfemb_wm_voffset'] : '5';
			if ( ! is_numeric( $newinput['pdfemb_wm_voffset'] ) ) {
				add_settings_error(
					'pdfemb_wm_voffset',
					'notnumeric',
					self::get_error_string( 'pdfemb_wm_voffset|notnumeric' ),
					'error'
				);
			}

			$newinput['pdfemb_wm_fontsize'] = isset( $input['pdfemb_wm_fontsize'] ) ? $input['pdfemb_wm_fontsize'] : '20';
			if ( ! is_numeric( $newinput['pdfemb_wm_fontsize'] ) ) {
				add_settings_error(
					'pdfemb_wm_fontsize',
					'notnumeric',
					self::get_error_string( 'pdfemb_wm_fontsize|notnumeric' ),
					'error'
				);
			}

			$newinput['pdfemb_wm_opacity'] = isset( $input['pdfemb_wm_opacity'] ) ? $input['pdfemb_wm_opacity'] : '20';
			if ( ! is_numeric( $newinput['pdfemb_wm_opacity'] ) ) {
				add_settings_error(
					'pdfemb_wm_opacity',
					'notnumeric',
					self::get_error_string( 'pdfemb_wm_opacity|notnumeric' ),
					'error'
				);
			}

			$newinput['pdfemb_wm_rotate'] = isset( $input['pdfemb_wm_rotate'] ) ? $input['pdfemb_wm_rotate'] : '35';
			if ( ! is_numeric( $newinput['pdfemb_wm_rotate'] ) ) {
				add_settings_error(
					'pdfemb_wm_rotate',
					'notnumeric',
					self::get_error_string( 'pdfemb_wm_rotate|notnumeric' ),
					'error'
				);
			}

			$newinput['pdfemb_wm_evenpages'] = isset( $input['pdfemb_wm_evenpages'] ) && ( true === $input['pdfemb_wm_evenpages'] || 'on' === $input['pdfemb_wm_evenpages'] );

			return $newinput;
		}

		/**
		 * Helper Method to get string errods
		 *
		 * @param string $fielderror Field Error.
		 * @return string
		 */
		protected function get_error_string( $fielderror ) {
			$secure_local_error_strings = array(
				'pdfemb_wm_voffset|notnumeric'  => __( 'Watermark Vertical offset should be a numerical value between 0 and 100', 'pdf-embedder' ),
				'pdfemb_wm_fontsize|notnumeric' => __( 'Font Size should be a numerical value', 'pdf-embedder' ),
				'pdfemb_wm_opacity|notnumeric'  => __( 'Watermark Opacity should be a numerical value between 0 and 100', 'pdf-embedder' ),
				'pdfemb_wm_rotate|notnumeric'   => __( 'Watermark Rotation should be a numerical value in degrees (0 to 360)', 'pdf-embedder' ),
			);
			if ( isset( $secure_local_error_strings[ $fielderror ] ) ) {
				return $secure_local_error_strings[ $fielderror ];
			}
			return parent::get_error_string( $fielderror );
		}

		/**
		 * Helper Method to get direct link
		 *
		 * @param array  $atts Attributes.
		 * @param string $content Content.
		 * @return string
		 */
		public function pdfemb_shortcode_direct_link( $atts, $content = null ) {
			if ( ! isset( $atts['url'] ) ) {
				return '<b>pdf-direct-link requires a url attribute</b>';
			}

			$url = $this->pdfth_pdf_direct_download_url( set_url_scheme( $atts['url'] ) );

			$innerhtml = '';
			if ( ! empty( $content ) ) {
				$innerhtml = do_shortcode( $content );
			}

			if ( strlen( $innerhtml ) === 0 ) {
				$innerhtml = isset( $atts['text'] ) ? $atts['text'] : $atts['url'];
			}

			$returnhtml = '<a href="' . esc_attr( $url ) . '">' . $innerhtml . '</a>';

			return $returnhtml;
		}
		/**
		 * Undocumented function
		 *
		 * @return void
		 */
		protected function add_actions() {
			parent::add_actions();

			add_shortcode( 'pdf-direct-link', array( $this, 'pdfemb_shortcode_direct_link' ) );
		}

		/**
		 * Helper Method to get basename
		 *
		 * @return string
		 */
		protected function pdf_plugin_basename() {
			$basename = plugin_basename( __FILE__ );
			if ( __FILE__ === '/' . $basename ) { // Maybe due to symlink.
				$basename = basename( dirname( __FILE__ ) ) . '/' . basename( __FILE__ );
			}
			return $basename;
		}
		/**
		 * Helper Method to get plugin url
		 *
		 * @return string
		 */
		protected function pdf_plugin_url() {
			$basename = plugin_basename( __FILE__ );

			if ( __FILE__ === '/' . $basename ) { // Maybe due to symlink.
				return plugins_url() . '/' . basename( dirname( __FILE__ ) ) . '/';
			}

			// Normal case (non symlink).
			return plugin_dir_url( __FILE__ );
		}

		/**
		 * Helper method to include files.
		 *
		 * @since 4.6.5
		 *
		 * @return void
		 */
		public function includes() {
			require_once plugin_dir_path( __FILE__ ) . '/core/review.php';
		}

		/**
		 * Helper to define
		 *
		 * @param string $name Define Name.
		 * @param mixed  $value Value.
		 * @return void
		 */
		public function define( $name, $value ) {

			if ( ! defined( $name ) ) {
				define( $name, $value );
			}
		}

		/**
		 * Setup Globals.
		 *
		 * @return void
		 */
		public function setup_globals() {
			$this->define( 'WP_PDF_VERSION', $this->plugin_version );
			$this->define( 'WP_PDF_SECURE_FILE', $this->file );
			$this->define( 'WP_PDF_SECURE_DIR', plugin_dir_path( __FILE__ ) );
			$this->define( 'WP_PDF_SECURE_URL', plugin_dir_url( __FILE__ ) );
		}

		/**
		 * Undocumented function
		 *
		 * @return object
		 */
		public static function get_instance() {
			if ( null === self::$instance ) {
				self::$instance = new self();
				self::$instance->setup_globals();
				self::$instance->includes();
			}

			return self::$instance;
		}
	}

	/**
	 * Singleton Instance
	 *
	 * @return WP_PDF_Secure
	 */
	function init_pdf_emb_secure() {
		return WP_PDF_Secure::get_instance();
	}

	// Initialise at least once.
	init_pdf_emb_secure();

}