Generate Open Graph Images for Blog Posts

OpenGraphImageController.php

<?php

namespace App\Http\Controllers;

use GDText\Box;
use GDText\Color;
use App\Models\Post;
use Illuminate\Support\Facades\Cache;

class OpenGraphImageController extends Controller
{
    /**
     * Display the specified resource.
     *
     * @param  \App\Models\Post  $post
     * @return \Illuminate\Http\Response
     */
    public function show(Post $post, $domain = null)
    {
        $blog = $user->setting('title', $user->username);
        $title = $post->title;
        $time = $post->readingTime;
        $key = md5("opengraph.{$blog}.{$title}.{$time}");

        $image = Cache::remember($key, now()->addDays(1), function () use ($blog, $title, $time) {
            $image = imagecreatetruecolor(1200, 630);
            $backgroundColor = imagecolorallocate($image, 0, 0, 0);
            imagefill($image, 0, 0, $backgroundColor);

            $box = new Box($image);
            $box->setTextAlign('left', 'top');

            $border = 40;

            // user
            $box->setFontFace(
                resource_path('fonts/Inter-Regular.otf')
            );
            $box->setFontColor(new Color(102, 102, 102));
            $box->setFontSize(38);
            $box->setBox($border, $border, 1200 - $border - $border, 630 - $border - $border);
            $box->draw($blog);

            // title
            $box->setFontFace(
                resource_path('fonts/Inter-Medium.otf')
            );
            $box->setFontColor(new Color(255, 255, 255));
            $box->setFontSize(64);
            $box->setBox($border, $border + 80, 1200 - $border - $border, 630 - 120 - $border);
            $box->draw($title);

            // reading time
            $box->setFontFace(
                resource_path('fonts/Inter-Regular.otf')
            );
            $box->setFontColor(new Color(102, 102, 102));
            $box->setFontSize(38);
            $box->setBox($border, 630 - $border - 38*1.3, 1200 - $border - $border, 630 - $border - $border);
            $box->draw($time);

            ob_start();
            imagepng($image);
            return ob_get_clean();
        });

        return response($image, 200)
            ->header('Content-Type', 'image/png');
    }
}

Post.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    public function getWordCountAttribute()
    {
        return str_word_count($this->bodyAsPlainText);
    }

    public function getReadingTimeAttribute()
    {
        $minutes = ceil($this->wordCount / 225);

        return $minutes . ' minute' . ($minutes == 1 ? '' : 's');
    }
}