Add Previewify image provider (#20)

* Add previewify image provider

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

README.md

@@ -7,7 +7,7 @@ By default, it uses `<title>` and OpenGraph tags. It also ships with a Twitter e
 **Features**:
 - Setting SEO tags from PHP
 - Setting SEO tags from Blade
-- Integration with [Flipp](https://useflipp.com), to automatically generate cover images
+- Integration with [Flipp](https://useflipp.com) and [Previewify](https://previewify.app), to automatically generate cover images
 - Custom extension support
 - Expressive & simple API
 - Customizable views
@@ -216,6 +216,43 @@ The `flipp()` method also returns a signed URL to the image, which lets you use
 <img alt="@seo('title')" src="@seo('flipp', 'blog')">
 ```
 
+### Previewify integration
+
+First, you need to add your Previewify API keys:
+1. Add your API key to the `PREVIEWIFY_KEY` environment variable. You can get the key [here](https://previewify.app/app/account).
+2. Go to `config/services.php` and add:
+    ```php
+    'previewify' => [
+        'key' => env('PREVIEWIFY_KEY'),
+    ],
+    ```
+
+Then, register your templates, for example in `AppServiceProvider`:
+```php
+seo()->previewify('blog', 24);
+seo()->previewify('page', 83);
+```
+
+After that, you can use the templates by calling `seo()->previewify()` like this:
+```php
+seo()->previewify('blog', ['title' => 'Foo', 'content' => 'bar'])`
+```
+
+The call will set the generated image as the OpenGraph and Twitter card images. The generated URLs are signed.
+
+If no data array is provided, the method will use the `title` and `description` from the current SEO config:
+
+```php
+seo()->title($post->title);
+seo()->description($post->excerpt);
+seo()->previewify('blog');
+```
+
+The `previewify()` method also returns a signed URL to the image, which lets you use it in other places, such as blog cover images.
+```php
+<img alt="@seo('title')" src="@seo('previewify', 'blog')">
+```
+
 ## Examples
 
 ### Service Provider

phpstan.neon

@@ -14,5 +14,6 @@ parameters:
 
     ignoreErrors:
         # Waiting for https://github.com/phpstan/phpstan/issues/5706
-        - '#^Cannot call method (flipp|get|set)\(\) on ArchTech\\SEO\\SEOManager\|array\|string\|null\.$#'
+        - '#^Cannot call method (flipp|previewify|get|set)\(\) on ArchTech\\SEO\\SEOManager\|array\|string\|null\.$#'
         - '#^Method ArchTech\\SEO\\SEOManager::flipp\(\) should return static\(ArchTech\\SEO\\SEOManager\)\|string but returns array\|string\|null\.$#'
+        - '#^Method ArchTech\\SEO\\SEOManager::previewify\(\) should return static\(ArchTech\\SEO\\SEOManager\)\|string but returns array\|string\|null\.$#'

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 (...$args) {
-            // Flipp supports more arguments
+            // Flipp and Previewify support more arguments
-            if ($args[0] === 'flipp') {
+            if (in_array($args[0], ['flipp', 'previewify'], true)) {
-                array_shift($args);
+                $method = array_shift($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;
             }

tests/Pest/FlippTest.php

@@ -68,3 +68,10 @@ test('flipp uses the raw title and description', function () {
         ->toContain('s.useflipp.com/abcdefg')
         ->toContain(base64_encode(json_encode(['title' => 'foo', 'description' => 'bar'])));
 });
+
+test('the @seo helper can be used for setting a flipp image', function () {
+	seo()->flipp('blog', 'abcdefg');
+	blade("@seo(['flipp' => ['blog', ['title' => 'abc', 'excerpt' => 'def']]])");
+
+	expect(seo('image'))->toContain('s.useflipp.com/abcdefg');
+});

tests/Pest/PreviewifyTest.php

@@ -0,0 +1,77 @@
+<?php
+
+beforeEach(fn () => config(['services.previewify.key' => 'abc']));
+
+test('previewify templates can be set', function () {
+    seo()->previewify('blog', 1);
+
+    expect(seo()->meta('previewify.templates'))
+        ->toHaveCount(1)
+        ->toHaveKey('blog', '1');
+});
+
+test('previewify makes a request to the template not the alias', function () {
+    seo()->previewify('blog', 1);
+    expect(seo()->previewify('blog'))
+        ->toContain('previewify.app/generate/templates/1');
+});
+
+test('previewify templates can be given data', function () {
+    seo()->previewify('blog', 1);
+    expect(seo()->previewify('blog', ['title' => 'abc', 'excerpt' => 'def']))
+        ->toContain('previewify.app/generate/templates/1')
+        ->toContain(base64_encode(json_encode(['title' => 'abc', 'excerpt' => 'def'])));
+});
+
+test('the previewify method returns a link to a signed url', function () {
+    seo()->previewify('blog', 1);
+
+    expect(seo()->previewify('blog', ['title' => 'abc']))
+        ->toContain('?signature=' . hash_hmac('sha256', base64_encode(json_encode(['title' => 'abc'])), config('services.previewify.key')));
+});
+
+test("previewify templates use default data when they're not passed any data explicitly", function () {
+    seo()->previewify('blog', 1);
+
+    seo()->title('foo')->description('bar');
+
+    expect(seo()->previewify('blog'))
+        ->toContain('previewify.app/generate/templates/1')
+        ->toContain(base64_encode(json_encode(['title' => 'foo', 'description' => 'bar'])));
+});
+
+test('previewify images are used as the cover images', function () {
+    seo()->previewify('blog', 1);
+
+    seo()->title('foo')->description('bar');
+
+    expect(seo()->previewify('blog'))
+        ->toBe(seo('image'));
+});
+
+test('the blade directive can be used with previewify', function () {
+    seo()->previewify('blog', 1);
+
+    seo()->title('foo')->description('bar');
+
+    expect(blade("@seo('previewify', 'blog')"))->toBe(seo()->previewify('blog'));
+    expect(blade("@seo('previewify', 'blog', ['title' => 'abc'])"))->toBe(seo()->previewify('blog', ['title' => 'abc']));
+});
+
+test('previewify uses the raw title and description', function () {
+    seo()->previewify('blog', 1);
+
+    seo()->title(modify: fn (string $title) => $title . ' - modified');
+    seo()->title('foo')->description('bar');
+
+    expect(seo()->previewify('blog'))
+        ->toContain('previewify.app/generate/templates/1')
+        ->toContain(base64_encode(json_encode(['title' => 'foo', 'description' => 'bar'])));
+});
+
+test('the @seo helper can be used for setting a previewify image', function () {
+	seo()->previewify('blog', 1);
+	blade("@seo(['previewify' => ['blog', ['title' => 'abc', 'excerpt' => 'def']]])");
+
+	expect(seo('image'))->toContain('previewify.app/generate/templates/1');
+});