pla-version/app/Http/Controllers/VersionController.php

<?php

namespace App\Http\Controllers;

use GuzzleHttp\Client;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

class VersionController extends Controller
{
    const CACHE_TIME = 10;                          // Time to cache version

    const GL_PROJECT = 2;                           // Gitlab project number
    const GL_URL = 'https://dev.dege.au/api/v4';    // Gitlab URL

    const VERSION_REGEX = '/^v([0-9]+\.[0-9]+\.[0-9]+(\.[0-9]+)?)-([a-z]{3})-([a-z0-9]{8})$/';

    public function main(Request $request,string $version=NULL) {
        // Our version is in the format of either:
        // v1.2.3-xxx-abcdef01
        Log::info(sprintf('Connection from [%s] reporting version [%s]',$this->getUserIpAddr(),$version));

        $matches = [];
        if (preg_match(self::VERSION_REGEX,$version,$matches)) {
            // If xxx is "dev" we are a development version
            switch($matches[3]) {
                case 'dev':
                    $current = Cache::remember('dev',self::CACHE_TIME,function() {
                        $client = new Client;
                        $url = sprintf('%s/projects/%d/repository/commits',self::GL_URL,self::GL_PROJECT);

                        $response = $client->request('GET',$url,['form_params'=>['ref_name'=>'BRANCH-2.0','order'=>'default']]);

                        if ($response->getStatusCode() === 200) {
                            $result = collect(json_decode($response->getBody()));

                            return $result->first();
                        }

                        return NULL;
                    });

                    if ($current) {
                        $repository = sprintf('v%s-rel-%s',$matches[1],$current->short_id);

                        // Find the tag associated with version $matches[1] and see if it is more recent than $matches[4]
                        return ($matches[4] === $current->short_id) ? ['current'=>$repository] : ['upgrade'=>sprintf('v%s-%s-%s',$matches[1],$matches[3],$current->short_id)];

                    } else
                        return ['unknown'=>'vn.n.n-dev-hhhhhhhh'];

                case 'rel':
                    $current = Cache::remember('dev',self::CACHE_TIME,function() {
                        $client = new Client;
                        $url = sprintf('%s/projects/%d/repository/tags',self::GL_URL,self::GL_PROJECT);

                        // Find the tag associated with version $matches[1] and see if there is a more recent version number
                        $response = $client->request('GET',$url,['form_params'=>['ref_name'=>'master','sort'=>'desc']]);

                        if ($response->getStatusCode() === 200) {
                            $result = collect(json_decode($response->getBody()));

                            return $result->first();
                        }

                        return NULL;
                    });

                    if ($current) {
                        $repository = sprintf('v%s-rel-%s',$current->name,$current->commit->short_id);

                        // If $matches[1] is smaller, "upgrade available"
                        if ($matches[1] < $current->name)
                            return ['upgrade'=>$repository];

                        // If $matches[1] is the same, validate that $matches[4] is current and the same and if not, error
                        elseif ($matches[1] === $current->name)
                            return ($matches[4] === $current->commit->short_id) ? ['current'=>$repository] : ['mismatch'=>$repository];

                        // if $matches[1] is higher, abort
                        else
                            return ['unknown'=>$repository];

                    } else
                        return ['unknown'=>'vn.n.n-rel-hhhhhhhh'];
            }
        }

        // Return the current version
        return ['unknown'=>'vn.n.n-xxxx-hhhhhhhh'];
    }

    public function getUserIpAddr(){
        $ipaddress = '';
        if (isset($_SERVER['HTTP_CLIENT_IP']))
            $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
        else if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
            $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
        else if(isset($_SERVER['HTTP_X_FORWARDED']))
            $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
        else if(isset($_SERVER['HTTP_FORWARDED_FOR']))
            $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
        else if(isset($_SERVER['HTTP_FORWARDED']))
            $ipaddress = $_SERVER['HTTP_FORWARDED'];
        else if(isset($_SERVER['REMOTE_ADDR']))
            $ipaddress = $_SERVER['REMOTE_ADDR'];
        else
            $ipaddress = 'UNKNOWN';
        return $ipaddress;
     }
}