WP_REST_Plugins_Controller::create_item() WordPress Method

	public function create_item( $request ) {
		global $wp_filesystem;

		require_once ABSPATH . 'wp-admin/includes/file.php';
		require_once ABSPATH . 'wp-admin/includes/plugin.php';
		require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
		require_once ABSPATH . 'wp-admin/includes/plugin-install.php';

		$slug = $request['slug'];

		// Verify filesystem is accessible first.
		$filesystem_available = $this->is_filesystem_available();
		if ( is_wp_error( $filesystem_available ) ) {
			return $filesystem_available;
		}

		$api = plugins_api(
			'plugin_information',
			array(
				'slug'   => $slug,
				'fields' => array(
					'sections'       => false,
					'language_packs' => true,
				),
			)
		);

		if ( is_wp_error( $api ) ) {
			if ( false !== strpos( $api->get_error_message(), 'Plugin not found.' ) ) {
				$api->add_data( array( 'status' => 404 ) );
			} else {
				$api->add_data( array( 'status' => 500 ) );
			}

			return $api;
		}

		$skin     = new WP_Ajax_Upgrader_Skin();
		$upgrader = new Plugin_Upgrader( $skin );

		$result = $upgrader->install( $api->download_link );

		if ( is_wp_error( $result ) ) {
			$result->add_data( array( 'status' => 500 ) );

			return $result;
		}

		// This should be the same as $result above.
		if ( is_wp_error( $skin->result ) ) {
			$skin->result->add_data( array( 'status' => 500 ) );

			return $skin->result;
		}

		if ( $skin->get_errors()->has_errors() ) {
			$error = $skin->get_errors();
			$error->add_data( array( 'status' => 500 ) );

			return $error;
		}

		if ( is_null( $result ) ) {
			// Pass through the error from WP_Filesystem if one was raised.
			if ( $wp_filesystem instanceof WP_Filesystem_Base
				&& is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors()
			) {
				return new WP_Error(
					'unable_to_connect_to_filesystem',
					$wp_filesystem->errors->get_error_message(),
					array( 'status' => 500 )
				);
			}

			return new WP_Error(
				'unable_to_connect_to_filesystem',
				__( 'Unable to connect to the filesystem. Please confirm your credentials.' ),
				array( 'status' => 500 )
			);
		}

		$file = $upgrader->plugin_info();

		if ( ! $file ) {
			return new WP_Error(
				'unable_to_determine_installed_plugin',
				__( 'Unable to determine what plugin was installed.' ),
				array( 'status' => 500 )
			);
		}

		if ( 'inactive' !== $request['status'] ) {
			$can_change_status = $this->plugin_status_permission_check( $file, $request['status'], 'inactive' );

			if ( is_wp_error( $can_change_status ) ) {
				return $can_change_status;
			}

			$changed_status = $this->handle_plugin_status( $file, $request['status'], 'inactive' );

			if ( is_wp_error( $changed_status ) ) {
				return $changed_status;
			}
		}

		// Install translations.
		$installed_locales = array_values( get_available_languages() );
		/** This filter is documented in wp-includes/update.php */
		$installed_locales = apply_filters( 'plugins_update_check_locales', $installed_locales );

		$language_packs = array_map(
			static function( $item ) {
				return (object) $item;
			},
			$api->language_packs
		);

		$language_packs = array_filter(
			$language_packs,
			static function( $pack ) use ( $installed_locales ) {
				return in_array( $pack->language, $installed_locales, true );
			}
		);

		if ( $language_packs ) {
			$lp_upgrader = new Language_Pack_Upgrader( $skin );

			// Install all applicable language packs for the plugin.
			$lp_upgrader->bulk_upgrade( $language_packs );
		}

		$path          = WP_PLUGIN_DIR . '/' . $file;
		$data          = get_plugin_data( $path, false, false );
		$data['_file'] = $file;

		$response = $this->prepare_item_for_response( $data, $request );
		$response->set_status( 201 );
		$response->header( 'Location', rest_url( sprintf( '%s/%s/%s', $this->namespace, $this->rest_base, substr( $file, 0, - 4 ) ) ) );

		return $response;
	}