Add to Dependencies tab via Git Updater PRO REST API

add-plugin-dependency-api.php

<?php
/**
 * Add Plugin Dependency via REST API.
 *
 * @package Fragen\Plugin_Dependency_API
 *
 * Plugin Name:       Add Plugin Dependency via  REST API
 * Plugin URI:        https://gist.github.com/afragen/ba3fc125fb0ecd242b1b162153d6adf9
 * Description:       Add plugin dependency data to Dependencies tab via REST API endpoint and allow for Install Now button to function.
 * Version:           0.11.3
 * Author:            Andy Fragen
 * License:           MIT
 * Requires at least: 6.0
 * Requires PHP:      7.1
 * Gist Plugin URI:   https://gist.github.com/afragen/ba3fc125fb0ecd242b1b162153d6adf9
 *
 * An example plugins_api(), response https://git-updater.com/wp-json/git-updater/v1/plugins-api/?slug=git-updater
 */

namespace Fragen\Plugin_Dependency_API;

/*
 * Exit if called directly.
 * PHP version check and exit.
 */
if ( ! defined( 'WPINC' ) ) {
	die;
}

// Add the sites with REST enpoints that return plugins_api() data when passed `slug` query arg.
add_filter(
	'plugin_dependency_endpoints',
	function () {
		return [
			'https://git-updater.com/wp-json/git-updater/v1/plugins-api/',
		];
	}
);

/**
 * Class for integration of non-dot org plugin dependencies and WP core.
 */
class REST_Endpoints {

	/**
	 * Load hooks, let's get going.
	 *
	 * @return void
	 */
	public function load_hooks() {
		add_filter( 'plugins_api_result', [ $this, 'plugins_api_result' ], 10, 3 );
		add_filter( 'upgrader_post_install', [ $this, 'upgrader_post_install' ], 10, 3 );
	}

	/**
	 * Filter `plugins_api_result` for adding plugin dependencies.
	 *
	 * @param \stdClass $response Response from `plugins_api()`.
	 * @param string    $action   Action type.
	 * @param \stdClass $args     Array of data from hook.
	 *
	 * @return void|\WP_Error
	 */
	public function plugins_api_result( $response, $action, $args ) {
		if ( is_wp_error( $response ) ) {
			/**
			 * Filter the REST enpoints used for lookup of plugins API data.
			 *
			 * @param array
			 */
			$rest_endpoints = apply_filters( 'plugin_dependency_endpoints', [] );

			foreach ( $rest_endpoints as $endpoint ) {
				$url      = add_query_arg( 'slug', $args->slug, trailingslashit( $endpoint ) );
				$response = wp_remote_get( $url );
				$response = json_decode( wp_remote_retrieve_body( $response ), true );
				if ( null === $response || isset( $response->error ) || isset( $response->code ) ) {
					$message = isset( $response->error ) ? $response->error : null;
					return new \WP_Error( 'error', 'Error retrieving plugin data.', $message );
				}
				break;
			}

			// Add slug to hook_extra.
			add_filter(
				'upgrader_package_options',
				function ( $options ) use ( $args ) {
					$options['hook_extra']['slug'] = $args->slug;

					return $options;
				},
				10,
				1
			);
		}

		return (object) $response;
	}

	/**
	 * Filter `upgrader_post_install` for plugin dependencies.
	 *
	 * @uses Git Updater PRO REST API.
	 *
	 * @param bool  $true       Default is true.
	 * @param array $hook_extra Array of data from hook.
	 * @param array $result     Array of data for installation.
	 *
	 * @return bool
	 */
	public function upgrader_post_install( $true, $hook_extra, $result ) {
		global $wp_filesystem;

		if ( ! isset( $hook_extra['slug'] ) ) {
			return $true;
		}

		$from = untrailingslashit( $result['destination'] );
		$to   = trailingslashit( $result['local_destination'] ) . $hook_extra['slug'];

		if ( $from !== $to ) {
			// TODO: use move_dir().
			if ( ! rename( $from, $to ) ) {
				$wp_filesystem->mkdir( $to );
				copy_dir( $from, $to, [ basename( $to ) ] );
				$wp_filesystem->delete( $from, true );
			}
		}

		return $true;
	}
}

( new REST_Endpoints() )->load_hooks();