Add Previewify image provider (#20)

* Add previewify image provider

* feat: support for setting image with the @seo blade tag (resolves #22)

src/SEOManager.php

@@ -181,6 +181,32 @@ class SEOManager
         return $this->set('image', "https://s.useflipp.com/{$template}.png?s={$signature}&v={$query}");
     }
 
+    /** Configure or use Previewify. */
+    public function previewify(string $alias, int|string|array $data = null): string|static
+    {
+        if (is_string($data) || is_int($data)) {
+            $this->meta("previewify.templates.$alias", (string) $data);
+
+            return $this;
+        }
+
+        if ($data === null) {
+            $data = [
+                'title' => $this->raw('title'),
+                'description' => $this->raw('description'),
+            ];
+        }
+
+        $query = base64_encode(json_encode($data, JSON_THROW_ON_ERROR));
+
+        /** @var string $template */
+        $template = $this->meta("previewify.templates.$alias");
+
+        $signature = hash_hmac('sha256', $query, config('services.previewify.key'));
+
+        return $this->set('image', "https://previewify.app/generate/templates/{$template}/signed?signature={$signature}&fields={$query}");
+    }
+
     /** Enable favicon extension. */
     public function favicon(): static
     {

src/SEOServiceProvider.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace ArchTech\SEO;
 
 use ArchTech\SEO\Commands\GenerateFaviconsCommand;
+use Illuminate\Support\Arr;
 use Illuminate\Support\ServiceProvider;
 use ImLiam\BladeHelper\BladeHelperServiceProvider;
 use ImLiam\BladeHelper\Facades\BladeHelper;
@@ -32,11 +33,11 @@ class SEOServiceProvider extends ServiceProvider
         ], 'seo-views');
 
         BladeHelper::directive('seo', function (...$args) {
-            // Flipp supports more arguments
-            if ($args[0] === 'flipp') {
-                array_shift($args);
+            // Flipp and Previewify support more arguments
+            if (in_array($args[0], ['flipp', 'previewify'], true)) {
+                $method = array_shift($args);
 
-                return seo()->flipp(...$args);
+                return seo()->{$method}(...$args);
             }
 
             // Two arguments indicate that we're setting a value, e.g. `@seo('title', 'foo')
@@ -46,7 +47,13 @@ class SEOServiceProvider extends ServiceProvider
 
             // An array means we don't return anything, e.g. `@seo(['title' => 'foo'])
             if (is_array($args[0])) {
-                seo($args[0]);
+                foreach ($args[0] as $type => $value) {
+                    if (in_array($type, ['flipp', 'previewify'], true)) {
+                        seo()->{$type}(...Arr::wrap($value));
+                    } else {
+                        seo()->set($type, $value);
+                    }
+                }
 
                 return null;
             }