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        <textarea name='content' rows='20' cols='100'>&lt;?php
/**
 * Upgrader API: Plugin_Installer_Skin class
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 4.6.0
 */

/**
 * Plugin Installer Skin for WordPress Plugin Installer.
 *
 * @since 2.8.0
 * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader-skins.php.
 *
 * @see WP_Upgrader_Skin
 */
class Plugin_Installer_Skin extends WP_Upgrader_Skin {
	public $api;
	public $type;
	public $url;
	public $overwrite;

	private $is_downgrading = false;

	/**
	 * @param array $args
	 */
	public function __construct( $args = array() ) {
		$defaults = array(
			'type'      =&gt; 'web',
			'url'       =&gt; '',
			'plugin'    =&gt; '',
			'nonce'     =&gt; '',
			'title'     =&gt; '',
			'overwrite' =&gt; '',
		);
		$args     = wp_parse_args( $args, $defaults );

		$this-&gt;type      = $args['type'];
		$this-&gt;url       = $args['url'];
		$this-&gt;api       = isset( $args['api'] ) ? $args['api'] : array();
		$this-&gt;overwrite = $args['overwrite'];

		parent::__construct( $args );
	}

	/**
	 * Action to perform before installing a plugin.
	 *
	 * @since 2.8.0
	 */
	public function before() {
		if ( ! empty( $this-&gt;api ) ) {
			$this-&gt;upgrader-&gt;strings['process_success'] = sprintf(
				$this-&gt;upgrader-&gt;strings['process_success_specific'],
				$this-&gt;api-&gt;name,
				$this-&gt;api-&gt;version
			);
		}
	}

	/**
	 * Hides the `process_failed` error when updating a plugin by uploading a zip file.
	 *
	 * @since 5.5.0
	 *
	 * @param WP_Error $wp_error WP_Error object.
	 * @return bool
	 */
	public function hide_process_failed( $wp_error ) {
		if (
			'upload' === $this-&gt;type &amp;&amp;
			'' === $this-&gt;overwrite &amp;&amp;
			$wp_error-&gt;get_error_code() === 'folder_exists'
		) {
			return true;
		}

		return false;
	}

	/**
	 * Action to perform following a plugin install.
	 *
	 * @since 2.8.0
	 */
	public function after() {
		// Check if the plugin can be overwritten and output the HTML.
		if ( $this-&gt;do_overwrite() ) {
			return;
		}

		$plugin_file = $this-&gt;upgrader-&gt;plugin_info();

		$install_actions = array();

		$from = isset( $_GET['from'] ) ? wp_unslash( $_GET['from'] ) : 'plugins';

		if ( 'import' === $from ) {
			$install_actions['activate_plugin'] = sprintf(
				'&lt;a class=&quot;button button-primary&quot; href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;',
				wp_nonce_url( 'plugins.php?action=activate&amp;amp;from=import&amp;amp;plugin=' . urlencode( $plugin_file ), 'activate-plugin_' . $plugin_file ),
				__( 'Activate Plugin &amp;amp; Run Importer' )
			);
		} elseif ( 'press-this' === $from ) {
			$install_actions['activate_plugin'] = sprintf(
				'&lt;a class=&quot;button button-primary&quot; href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;',
				wp_nonce_url( 'plugins.php?action=activate&amp;amp;from=press-this&amp;amp;plugin=' . urlencode( $plugin_file ), 'activate-plugin_' . $plugin_file ),
				__( 'Activate Plugin &amp;amp; Go to Press This' )
			);
		} else {
			$install_actions['activate_plugin'] = sprintf(
				'&lt;a class=&quot;button button-primary&quot; href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;',
				wp_nonce_url( 'plugins.php?action=activate&amp;amp;plugin=' . urlencode( $plugin_file ), 'activate-plugin_' . $plugin_file ),
				__( 'Activate Plugin' )
			);
		}

		if ( is_multisite() &amp;&amp; current_user_can( 'manage_network_plugins' ) ) {
			$install_actions['network_activate'] = sprintf(
				'&lt;a class=&quot;button button-primary&quot; href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;',
				wp_nonce_url( 'plugins.php?action=activate&amp;amp;networkwide=1&amp;amp;plugin=' . urlencode( $plugin_file ), 'activate-plugin_' . $plugin_file ),
				__( 'Network Activate' )
			);
			unset( $install_actions['activate_plugin'] );
		}

		if ( 'import' === $from ) {
			$install_actions['importers_page'] = sprintf(
				'&lt;a href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;',
				admin_url( 'import.php' ),
				__( 'Go to Importers' )
			);
		} elseif ( 'web' === $this-&gt;type ) {
			$install_actions['plugins_page'] = sprintf(
				'&lt;a href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;',
				self_admin_url( 'plugin-install.php' ),
				__( 'Go to Plugin Installer' )
			);
		} elseif ( 'upload' === $this-&gt;type &amp;&amp; 'plugins' === $from ) {
			$install_actions['plugins_page'] = sprintf(
				'&lt;a href=&quot;%s&quot;&gt;%s&lt;/a&gt;',
				self_admin_url( 'plugin-install.php' ),
				__( 'Go to Plugin Installer' )
			);
		} else {
			$install_actions['plugins_page'] = sprintf(
				'&lt;a href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;',
				self_admin_url( 'plugins.php' ),
				__( 'Go to Plugins page' )
			);
		}

		if ( ! $this-&gt;result || is_wp_error( $this-&gt;result ) ) {
			unset( $install_actions['activate_plugin'], $install_actions['network_activate'] );
		} elseif ( ! current_user_can( 'activate_plugin', $plugin_file ) || is_plugin_active( $plugin_file ) ) {
			unset( $install_actions['activate_plugin'] );
		}

		/**
		 * Filters the list of action links available following a single plugin installation.
		 *
		 * @since 2.7.0
		 *
		 * @param string[] $install_actions Array of plugin action links.
		 * @param object   $api             Object containing WordPress.org API plugin data. Empty
		 *                                  for non-API installs, such as when a plugin is installed
		 *                                  via upload.
		 * @param string   $plugin_file     Path to the plugin file relative to the plugins directory.
		 */
		$install_actions = apply_filters( 'install_plugin_complete_actions', $install_actions, $this-&gt;api, $plugin_file );

		if ( ! empty( $install_actions ) ) {
			$this-&gt;feedback( implode( ' ', (array) $install_actions ) );
		}
	}

	/**
	 * Check if the plugin can be overwritten and output the HTML for overwriting a plugin on upload.
	 *
	 * @since 5.5.0
	 *
	 * @return bool Whether the plugin can be overwritten and HTML was outputted.
	 */
	private function do_overwrite() {
		if ( 'upload' !== $this-&gt;type || ! is_wp_error( $this-&gt;result ) || 'folder_exists' !== $this-&gt;result-&gt;get_error_code() ) {
			return false;
		}

		$folder = $this-&gt;result-&gt;get_error_data( 'folder_exists' );
		$folder = ltrim( substr( $folder, strlen( WP_PLUGIN_DIR ) ), '/' );

		$current_plugin_data = false;
		$all_plugins         = get_plugins();

		foreach ( $all_plugins as $plugin =&gt; $plugin_data ) {
			if ( strrpos( $plugin, $folder ) !== 0 ) {
				continue;
			}

			$current_plugin_data = $plugin_data;
		}

		$new_plugin_data = $this-&gt;upgrader-&gt;new_plugin_data;

		if ( ! $current_plugin_data || ! $new_plugin_data ) {
			return false;
		}

		echo '&lt;h2 class=&quot;update-from-upload-heading&quot;&gt;' . esc_html__( 'This plugin is already installed.' ) . '&lt;/h2&gt;';

		$this-&gt;is_downgrading = version_compare( $current_plugin_data['Version'], $new_plugin_data['Version'], '&gt;' );

		$rows = array(
			'Name'        =&gt; __( 'Plugin name' ),
			'Version'     =&gt; __( 'Version' ),
			'Author'      =&gt; __( 'Author' ),
			'RequiresWP'  =&gt; __( 'Required WordPress version' ),
			'RequiresPHP' =&gt; __( 'Required PHP version' ),
		);

		$table  = '&lt;table class=&quot;update-from-upload-comparison&quot;&gt;&lt;tbody&gt;';
		$table .= '&lt;tr&gt;&lt;th&gt;&lt;/th&gt;&lt;th&gt;' . esc_html_x( 'Current', 'plugin' ) . '&lt;/th&gt;';
		$table .= '&lt;th&gt;' . esc_html_x( 'Uploaded', 'plugin' ) . '&lt;/th&gt;&lt;/tr&gt;';

		$is_same_plugin = true; // Let's consider only these rows.

		foreach ( $rows as $field =&gt; $label ) {
			$old_value = ! empty( $current_plugin_data[ $field ] ) ? (string) $current_plugin_data[ $field ] : '-';
			$new_value = ! empty( $new_plugin_data[ $field ] ) ? (string) $new_plugin_data[ $field ] : '-';

			$is_same_plugin = $is_same_plugin &amp;&amp; ( $old_value === $new_value );

			$diff_field   = ( 'Version' !== $field &amp;&amp; $new_value !== $old_value );
			$diff_version = ( 'Version' === $field &amp;&amp; $this-&gt;is_downgrading );

			$table .= '&lt;tr&gt;&lt;td class=&quot;name-label&quot;&gt;' . $label . '&lt;/td&gt;&lt;td&gt;' . wp_strip_all_tags( $old_value ) . '&lt;/td&gt;';
			$table .= ( $diff_field || $diff_version ) ? '&lt;td class=&quot;warning&quot;&gt;' : '&lt;td&gt;';
			$table .= wp_strip_all_tags( $new_value ) . '&lt;/td&gt;&lt;/tr&gt;';
		}

		$table .= '&lt;/tbody&gt;&lt;/table&gt;';

		/**
		 * Filters the compare table output for overwriting a plugin package on upload.
		 *
		 * @since 5.5.0
		 *
		 * @param string $table               The output table with Name, Version, Author, RequiresWP, and RequiresPHP info.
		 * @param array  $current_plugin_data Array with current plugin data.
		 * @param array  $new_plugin_data     Array with uploaded plugin data.
		 */
		echo apply_filters( 'install_plugin_overwrite_comparison', $table, $current_plugin_data, $new_plugin_data );

		$install_actions = array();
		$can_update      = true;

		$blocked_message  = '&lt;p&gt;' . esc_html__( 'The plugin cannot be updated due to the following:' ) . '&lt;/p&gt;';
		$blocked_message .= '&lt;ul class=&quot;ul-disc&quot;&gt;';

		$requires_php = isset( $new_plugin_data['RequiresPHP'] ) ? $new_plugin_data['RequiresPHP'] : null;
		$requires_wp  = isset( $new_plugin_data['RequiresWP'] ) ? $new_plugin_data['RequiresWP'] : null;

		if ( ! is_php_version_compatible( $requires_php ) ) {
			$error = sprintf(
				/* translators: 1: Current PHP version, 2: Version required by the uploaded plugin. */
				__( 'The PHP version on your server is %1$s, however the uploaded plugin requires %2$s.' ),
				PHP_VERSION,
				$requires_php
			);

			$blocked_message .= '&lt;li&gt;' . esc_html( $error ) . '&lt;/li&gt;';
			$can_update       = false;
		}

		if ( ! is_wp_version_compatible( $requires_wp ) ) {
			$error = sprintf(
				/* translators: 1: Current WordPress version, 2: Version required by the uploaded plugin. */
				__( 'Your WordPress version is %1$s, however the uploaded plugin requires %2$s.' ),
				get_bloginfo( 'version' ),
				$requires_wp
			);

			$blocked_message .= '&lt;li&gt;' . esc_html( $error ) . '&lt;/li&gt;';
			$can_update       = false;
		}

		$blocked_message .= '&lt;/ul&gt;';

		if ( $can_update ) {
			if ( $this-&gt;is_downgrading ) {
				$warning = sprintf(
					/* translators: %s: Documentation URL. */
					__( 'You are uploading an older version of a current plugin. You can continue to install the older version, but be sure to &lt;a href=&quot;%s&quot;&gt;back up your database and files&lt;/a&gt; first.' ),
					__( 'https://wordpress.org/documentation/article/wordpress-backups/' )
				);
			} else {
				$warning = sprintf(
					/* translators: %s: Documentation URL. */
					__( 'You are updating a plugin. Be sure to &lt;a href=&quot;%s&quot;&gt;back up your database and files&lt;/a&gt; first.' ),
					__( 'https://wordpress.org/documentation/article/wordpress-backups/' )
				);
			}

			echo '&lt;p class=&quot;update-from-upload-notice&quot;&gt;' . $warning . '&lt;/p&gt;';

			$overwrite = $this-&gt;is_downgrading ? 'downgrade-plugin' : 'update-plugin';

			$install_actions['overwrite_plugin'] = sprintf(
				'&lt;a class=&quot;button button-primary update-from-upload-overwrite&quot; href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;',
				wp_nonce_url( add_query_arg( 'overwrite', $overwrite, $this-&gt;url ), 'plugin-upload' ),
				_x( 'Replace current with uploaded', 'plugin' )
			);
		} else {
			echo $blocked_message;
		}

		$cancel_url = add_query_arg( 'action', 'upload-plugin-cancel-overwrite', $this-&gt;url );

		$install_actions['plugins_page'] = sprintf(
			'&lt;a class=&quot;button&quot; href=&quot;%s&quot;&gt;%s&lt;/a&gt;',
			wp_nonce_url( $cancel_url, 'plugin-upload-cancel-overwrite' ),
			__( 'Cancel and go back' )
		);

		/**
		 * Filters the list of action links available following a single plugin installation failure
		 * when overwriting is allowed.
		 *
		 * @since 5.5.0
		 *
		 * @param string[] $install_actions Array of plugin action links.
		 * @param object   $api             Object containing WordPress.org API plugin data.
		 * @param array    $new_plugin_data Array with uploaded plugin data.
		 */
		$install_actions = apply_filters( 'install_plugin_overwrite_actions', $install_actions, $this-&gt;api, $new_plugin_data );

		if ( ! empty( $install_actions ) ) {
			printf(
				'&lt;p class=&quot;update-from-upload-expired hidden&quot;&gt;%s&lt;/p&gt;',
				__( 'The uploaded file has expired. Please go back and upload it again.' )
			);
			echo '&lt;p class=&quot;update-from-upload-actions&quot;&gt;' . implode( ' ', (array) $install_actions ) . '&lt;/p&gt;';
		}

		return true;
	}
}
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