<h3>Düzenle: class-theme-installer-skin.php</h3>
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/**
 * Upgrader API: Theme_Installer_Skin class
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 4.6.0
 */

/**
 * Theme Installer Skin for the WordPress Theme 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 Theme_Installer_Skin extends WP_Upgrader_Skin {
	public $api;
	public $type;
	public $url;
	public $overwrite;

	private $is_downgrading = false;

	/**
	 * Constructor.
	 *
	 * Sets up the theme installer skin.
	 *
	 * @since 2.8.0
	 *
	 * @param array $args
	 */
	public function __construct( $args = array() ) {
		$defaults = array(
			&#039;type&#039;      =&gt; &#039;web&#039;,
			&#039;url&#039;       =&gt; &#039;&#039;,
			&#039;theme&#039;     =&gt; &#039;&#039;,
			&#039;nonce&#039;     =&gt; &#039;&#039;,
			&#039;title&#039;     =&gt; &#039;&#039;,
			&#039;overwrite&#039; =&gt; &#039;&#039;,
		);
		$args     = wp_parse_args( $args, $defaults );

		$this-&gt;type      = $args[&#039;type&#039;];
		$this-&gt;url       = $args[&#039;url&#039;];
		$this-&gt;api       = isset( $args[&#039;api&#039;] ) ? $args[&#039;api&#039;] : array();
		$this-&gt;overwrite = $args[&#039;overwrite&#039;];

		parent::__construct( $args );
	}

	/**
	 * Performs an action before installing a theme.
	 *
	 * @since 2.8.0
	 */
	public function before() {
		if ( ! empty( $this-&gt;api ) ) {
			$this-&gt;upgrader-&gt;strings[&#039;process_success&#039;] = sprintf(
				$this-&gt;upgrader-&gt;strings[&#039;process_success_specific&#039;],
				$this-&gt;api-&gt;name,
				$this-&gt;api-&gt;version
			);
		}
	}

	/**
	 * Hides the `process_failed` error when updating a theme by uploading a zip file.
	 *
	 * @since 5.5.0
	 *
	 * @param WP_Error $wp_error WP_Error object.
	 * @return bool True if the error should be hidden, false otherwise.
	 */
	public function hide_process_failed( $wp_error ) {
		if (
			&#039;upload&#039; === $this-&gt;type &amp;&amp;
			&#039;&#039; === $this-&gt;overwrite &amp;&amp;
			$wp_error-&gt;get_error_code() === &#039;folder_exists&#039;
		) {
			return true;
		}

		return false;
	}

	/**
	 * Performs an action following a single theme install.
	 *
	 * @since 2.8.0
	 */
	public function after() {
		if ( $this-&gt;do_overwrite() ) {
			return;
		}

		if ( empty( $this-&gt;upgrader-&gt;result[&#039;destination_name&#039;] ) ) {
			return;
		}

		$theme_info = $this-&gt;upgrader-&gt;theme_info();
		if ( empty( $theme_info ) ) {
			return;
		}

		$name       = $theme_info-&gt;display( &#039;Name&#039; );
		$stylesheet = $this-&gt;upgrader-&gt;result[&#039;destination_name&#039;];
		$template   = $theme_info-&gt;get_template();

		$activate_link = add_query_arg(
			array(
				&#039;action&#039;     =&gt; &#039;activate&#039;,
				&#039;template&#039;   =&gt; urlencode( $template ),
				&#039;stylesheet&#039; =&gt; urlencode( $stylesheet ),
			),
			admin_url( &#039;themes.php&#039; )
		);
		$activate_link = wp_nonce_url( $activate_link, &#039;switch-theme_&#039; . $stylesheet );

		$install_actions = array();

		if ( current_user_can( &#039;edit_theme_options&#039; ) &amp;&amp; ( $theme_info-&gt;is_block_theme() || current_user_can( &#039;customize&#039; ) ) ) {
			if ( $theme_info-&gt;is_block_theme() ) {
				$customize_url = add_query_arg(
					array(
						&#039;wp_theme_preview&#039; =&gt; urlencode( $stylesheet ),
						&#039;return&#039;           =&gt; urlencode( admin_url( &#039;web&#039; === $this-&gt;type ? &#039;theme-install.php&#039; : &#039;themes.php&#039; ) ),
					),
					admin_url( &#039;site-editor.php&#039; )
				);
			} else {
				$customize_url = add_query_arg(
					array(
						&#039;theme&#039;  =&gt; urlencode( $stylesheet ),
						&#039;return&#039; =&gt; urlencode( admin_url( &#039;web&#039; === $this-&gt;type ? &#039;theme-install.php&#039; : &#039;themes.php&#039; ) ),
					),
					admin_url( &#039;customize.php&#039; )
				);
			}

			$install_actions[&#039;preview&#039;] = sprintf(
				&#039;&lt;a href=&quot;%s&quot; class=&quot;hide-if-no-customize load-customize&quot;&gt;&#039; .
				&#039;&lt;span aria-hidden=&quot;true&quot;&gt;%s&lt;/span&gt;&lt;span class=&quot;screen-reader-text&quot;&gt;%s&lt;/span&gt;&lt;/a&gt;&#039;,
				esc_url( $customize_url ),
				__( &#039;Live Preview&#039; ),
				/* translators: Hidden accessibility text. %s: Theme name. */
				sprintf( __( &#039;Live Preview &amp;#8220;%s&amp;#8221;&#039; ), $name )
			);
		}

		$install_actions[&#039;activate&#039;] = sprintf(
			&#039;&lt;a href=&quot;%s&quot; class=&quot;activatelink&quot;&gt;&#039; .
			&#039;&lt;span aria-hidden=&quot;true&quot;&gt;%s&lt;/span&gt;&lt;span class=&quot;screen-reader-text&quot;&gt;%s&lt;/span&gt;&lt;/a&gt;&#039;,
			esc_url( $activate_link ),
			_x( &#039;Activate&#039;, &#039;theme&#039; ),
			/* translators: Hidden accessibility text. %s: Theme name. */
			sprintf( _x( &#039;Activate &amp;#8220;%s&amp;#8221;&#039;, &#039;theme&#039; ), $name )
		);

		if ( is_network_admin() &amp;&amp; current_user_can( &#039;manage_network_themes&#039; ) ) {
			$install_actions[&#039;network_enable&#039;] = sprintf(
				&#039;&lt;a href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;&#039;,
				esc_url( wp_nonce_url( &#039;themes.php?action=enable&amp;amp;theme=&#039; . urlencode( $stylesheet ), &#039;enable-theme_&#039; . $stylesheet ) ),
				__( &#039;Network Enable&#039; )
			);
		}

		if ( &#039;web&#039; === $this-&gt;type ) {
			$install_actions[&#039;themes_page&#039;] = sprintf(
				&#039;&lt;a href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;&#039;,
				self_admin_url( &#039;theme-install.php&#039; ),
				__( &#039;Go to Theme Installer&#039; )
			);
		} elseif ( current_user_can( &#039;switch_themes&#039; ) || current_user_can( &#039;edit_theme_options&#039; ) ) {
			$install_actions[&#039;themes_page&#039;] = sprintf(
				&#039;&lt;a href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;&#039;,
				self_admin_url( &#039;themes.php&#039; ),
				__( &#039;Go to Themes page&#039; )
			);
		}

		if ( ! $this-&gt;result || is_wp_error( $this-&gt;result ) || is_network_admin() || ! current_user_can( &#039;switch_themes&#039; ) ) {
			unset( $install_actions[&#039;activate&#039;], $install_actions[&#039;preview&#039;] );
		} elseif ( get_option( &#039;template&#039; ) === $stylesheet ) {
			unset( $install_actions[&#039;activate&#039;] );
		}

		/**
		 * Filters the list of action links available following a single theme installation.
		 *
		 * @since 2.8.0
		 *
		 * @param string[] $install_actions Array of theme action links.
		 * @param object   $api             Object containing WordPress.org API theme data.
		 * @param string   $stylesheet      Theme directory name.
		 * @param WP_Theme $theme_info      Theme object.
		 */
		$install_actions = apply_filters( &#039;install_theme_complete_actions&#039;, $install_actions, $this-&gt;api, $stylesheet, $theme_info );
		if ( ! empty( $install_actions ) ) {
			$this-&gt;feedback( implode( &#039; | &#039;, (array) $install_actions ) );
		}
	}

	/**
	 * Checks if the theme can be overwritten and outputs the HTML for overwriting a theme on upload.
	 *
	 * @since 5.5.0
	 *
	 * @return bool Whether the theme can be overwritten and HTML was outputted.
	 */
	private function do_overwrite() {
		if ( &#039;upload&#039; !== $this-&gt;type || ! is_wp_error( $this-&gt;result ) || &#039;folder_exists&#039; !== $this-&gt;result-&gt;get_error_code() ) {
			return false;
		}

		$folder = $this-&gt;result-&gt;get_error_data( &#039;folder_exists&#039; );
		$folder = rtrim( $folder, &#039;/&#039; );

		$current_theme_data = false;
		$all_themes         = wp_get_themes( array( &#039;errors&#039; =&gt; null ) );

		foreach ( $all_themes as $theme ) {
			$stylesheet_dir = wp_normalize_path( $theme-&gt;get_stylesheet_directory() );

			if ( rtrim( $stylesheet_dir, &#039;/&#039; ) !== $folder ) {
				continue;
			}

			$current_theme_data = $theme;
		}

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

		if ( ! $current_theme_data || ! $new_theme_data ) {
			return false;
		}

		echo &#039;&lt;h2 class=&quot;update-from-upload-heading&quot;&gt;&#039; . esc_html__( &#039;This theme is already installed.&#039; ) . &#039;&lt;/h2&gt;&#039;;

		// Check errors for active theme.
		if ( is_wp_error( $current_theme_data-&gt;errors() ) ) {
			$this-&gt;feedback( &#039;current_theme_has_errors&#039;, $current_theme_data-&gt;errors()-&gt;get_error_message() );
		}

		$this-&gt;is_downgrading = version_compare( $current_theme_data[&#039;Version&#039;], $new_theme_data[&#039;Version&#039;], &#039;&gt;&#039; );

		$is_invalid_parent = false;
		if ( ! empty( $new_theme_data[&#039;Template&#039;] ) ) {
			$is_invalid_parent = ! in_array( $new_theme_data[&#039;Template&#039;], array_keys( $all_themes ), true );
		}

		$rows = array(
			&#039;Name&#039;        =&gt; __( &#039;Theme name&#039; ),
			&#039;Version&#039;     =&gt; __( &#039;Version&#039; ),
			&#039;Author&#039;      =&gt; __( &#039;Author&#039; ),
			&#039;RequiresWP&#039;  =&gt; __( &#039;Required WordPress version&#039; ),
			&#039;RequiresPHP&#039; =&gt; __( &#039;Required PHP version&#039; ),
			&#039;Template&#039;    =&gt; __( &#039;Parent theme&#039; ),
		);

		$table  = &#039;&lt;table class=&quot;update-from-upload-comparison&quot;&gt;&lt;tbody&gt;&#039;;
		$table .= &#039;&lt;tr&gt;&lt;th&gt;&lt;/th&gt;&lt;th&gt;&#039; . esc_html_x( &#039;Installed&#039;, &#039;theme&#039; ) . &#039;&lt;/th&gt;&lt;th&gt;&#039; . esc_html_x( &#039;Uploaded&#039;, &#039;theme&#039; ) . &#039;&lt;/th&gt;&lt;/tr&gt;&#039;;

		$is_same_theme = true; // Let&#039;s consider only these rows.

		foreach ( $rows as $field =&gt; $label ) {
			$old_value = $current_theme_data-&gt;display( $field, false );
			$old_value = $old_value ? (string) $old_value : &#039;-&#039;;

			$new_value = ! empty( $new_theme_data[ $field ] ) ? (string) $new_theme_data[ $field ] : &#039;-&#039;;

			if ( $old_value === $new_value &amp;&amp; &#039;-&#039; === $new_value &amp;&amp; &#039;Template&#039; === $field ) {
				continue;
			}

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

			$diff_field     = ( &#039;Version&#039; !== $field &amp;&amp; $new_value !== $old_value );
			$diff_version   = ( &#039;Version&#039; === $field &amp;&amp; $this-&gt;is_downgrading );
			$invalid_parent = false;

			if ( &#039;Template&#039; === $field &amp;&amp; $is_invalid_parent ) {
				$invalid_parent = true;
				$new_value     .= &#039; &#039; . __( &#039;(not found)&#039; );
			}

			$table .= &#039;&lt;tr&gt;&lt;td class=&quot;name-label&quot;&gt;&#039; . $label . &#039;&lt;/td&gt;&lt;td&gt;&#039; . wp_strip_all_tags( $old_value ) . &#039;&lt;/td&gt;&#039;;
			$table .= ( $diff_field || $diff_version || $invalid_parent ) ? &#039;&lt;td class=&quot;warning&quot;&gt;&#039; : &#039;&lt;td&gt;&#039;;
			$table .= wp_strip_all_tags( $new_value ) . &#039;&lt;/td&gt;&lt;/tr&gt;&#039;;
		}

		$table .= &#039;&lt;/tbody&gt;&lt;/table&gt;&#039;;

		/**
		 * Filters the compare table output for overwriting a theme package on upload.
		 *
		 * @since 5.5.0
		 *
		 * @param string   $table              The output table with Name, Version, Author, RequiresWP, and RequiresPHP info.
		 * @param WP_Theme $current_theme_data Active theme data.
		 * @param array    $new_theme_data     Array with uploaded theme data.
		 */
		echo apply_filters( &#039;install_theme_overwrite_comparison&#039;, $table, $current_theme_data, $new_theme_data );

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

		$blocked_message  = &#039;&lt;p&gt;&#039; . esc_html__( &#039;The theme cannot be updated due to the following:&#039; ) . &#039;&lt;/p&gt;&#039;;
		$blocked_message .= &#039;&lt;ul class=&quot;ul-disc&quot;&gt;&#039;;

		$requires_php = isset( $new_theme_data[&#039;RequiresPHP&#039;] ) ? $new_theme_data[&#039;RequiresPHP&#039;] : null;
		$requires_wp  = isset( $new_theme_data[&#039;RequiresWP&#039;] ) ? $new_theme_data[&#039;RequiresWP&#039;] : null;

		if ( ! is_php_version_compatible( $requires_php ) ) {
			$error = sprintf(
				/* translators: 1: Current PHP version, 2: Version required by the uploaded theme. */
				__( &#039;The PHP version on your server is %1$s, however the uploaded theme requires %2$s.&#039; ),
				PHP_VERSION,
				$requires_php
			);

			$blocked_message .= &#039;&lt;li&gt;&#039; . esc_html( $error ) . &#039;&lt;/li&gt;&#039;;
			$can_update       = false;
		}

		if ( ! is_wp_version_compatible( $requires_wp ) ) {
			$error = sprintf(
				/* translators: 1: Current WordPress version, 2: Version required by the uploaded theme. */
				__( &#039;Your WordPress version is %1$s, however the uploaded theme requires %2$s.&#039; ),
				esc_html( wp_get_wp_version() ),
				$requires_wp
			);

			$blocked_message .= &#039;&lt;li&gt;&#039; . esc_html( $error ) . &#039;&lt;/li&gt;&#039;;
			$can_update       = false;
		}

		$blocked_message .= &#039;&lt;/ul&gt;&#039;;

		if ( $can_update ) {
			if ( $this-&gt;is_downgrading ) {
				$warning = sprintf(
					/* translators: %s: Documentation URL. */
					__( &#039;You are uploading an older version of the installed theme. 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.&#039; ),
					__( &#039;https://developer.wordpress.org/advanced-administration/security/backup/&#039; )
				);
			} else {
				$warning = sprintf(
					/* translators: %s: Documentation URL. */
					__( &#039;You are updating a theme. Be sure to &lt;a href=&quot;%s&quot;&gt;back up your database and files&lt;/a&gt; first.&#039; ),
					__( &#039;https://developer.wordpress.org/advanced-administration/security/backup/&#039; )
				);
			}

			echo &#039;&lt;p class=&quot;update-from-upload-notice&quot;&gt;&#039; . $warning . &#039;&lt;/p&gt;&#039;;

			$overwrite = $this-&gt;is_downgrading ? &#039;downgrade-theme&#039; : &#039;update-theme&#039;;

			$install_actions[&#039;overwrite_theme&#039;] = sprintf(
				&#039;&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;&#039;,
				wp_nonce_url( add_query_arg( &#039;overwrite&#039;, $overwrite, $this-&gt;url ), &#039;theme-upload&#039; ),
				_x( &#039;Replace installed with uploaded&#039;, &#039;theme&#039; )
			);
		} else {
			echo $blocked_message;
		}

		$cancel_url = add_query_arg( &#039;action&#039;, &#039;upload-theme-cancel-overwrite&#039;, $this-&gt;url );

		$install_actions[&#039;themes_page&#039;] = sprintf(
			&#039;&lt;a class=&quot;button&quot; href=&quot;%s&quot; target=&quot;_parent&quot;&gt;%s&lt;/a&gt;&#039;,
			wp_nonce_url( $cancel_url, &#039;theme-upload-cancel-overwrite&#039; ),
			__( &#039;Cancel and go back&#039; )
		);

		/**
		 * Filters the list of action links available following a single theme installation failure
		 * when overwriting is allowed.
		 *
		 * @since 5.5.0
		 *
		 * @param string[] $install_actions Array of theme action links.
		 * @param object   $api             Object containing WordPress.org API theme data.
		 * @param array    $new_theme_data  Array with uploaded theme data.
		 */
		$install_actions = apply_filters( &#039;install_theme_overwrite_actions&#039;, $install_actions, $this-&gt;api, $new_theme_data );

		if ( ! empty( $install_actions ) ) {
			printf(
				&#039;&lt;p class=&quot;update-from-upload-expired hidden&quot;&gt;%s&lt;/p&gt;&#039;,
				__( &#039;The uploaded file has expired. Please go back and upload it again.&#039; )
			);
			echo &#039;&lt;p class=&quot;update-from-upload-actions&quot;&gt;&#039; . implode( &#039; &#039;, (array) $install_actions ) . &#039;&lt;/p&gt;&#039;;
		}

		return true;
	}
}
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