Add Previewify image provider (#20)

* Add previewify image provider

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

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');
+});