Created PreviewGenerator module

module/PreviewGenerator/src/ConfigProvider.php

@@ -0,0 +1,15 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\PreviewGenerator;
+
+use function Shlinkio\Shlink\Common\loadConfigFromGlob;
+
+/** @deprecated */
+class ConfigProvider
+{
+    public function __invoke(): array
+    {
+        return loadConfigFromGlob(__DIR__ . '/../config/{,*.}config.php');
+    }
+}

module/PreviewGenerator/src/Image/ImageBuilder.php

@@ -0,0 +1,13 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\PreviewGenerator\Image;
+
+use mikehaertl\wkhtmlto\Image;
+use Zend\ServiceManager\AbstractPluginManager;
+
+/** @deprecated  */
+class ImageBuilder extends AbstractPluginManager implements ImageBuilderInterface
+{
+    protected $instanceOf = Image::class;
+}

module/PreviewGenerator/src/Image/ImageBuilderFactory.php

@@ -0,0 +1,34 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\PreviewGenerator\Image;
+
+use Interop\Container\ContainerInterface;
+use Interop\Container\Exception\ContainerException;
+use mikehaertl\wkhtmlto\Image;
+use Zend\ServiceManager\Exception\ServiceNotCreatedException;
+use Zend\ServiceManager\Exception\ServiceNotFoundException;
+use Zend\ServiceManager\Factory\FactoryInterface;
+
+/** @deprecated  */
+class ImageBuilderFactory implements FactoryInterface
+{
+    /**
+     * Create an object
+     *
+     * @param  ContainerInterface $container
+     * @param  string $requestedName
+     * @param  null|array $options
+     * @return object
+     * @throws ServiceNotFoundException if unable to resolve the service.
+     * @throws ServiceNotCreatedException if an exception is raised when
+     *     creating a service.
+     * @throws ContainerException if any other error occurs
+     */
+    public function __invoke(ContainerInterface $container, $requestedName, ?array $options = null)
+    {
+        return new ImageBuilder($container, ['factories' => [
+            Image::class => ImageFactory::class,
+        ]]);
+    }
+}

module/PreviewGenerator/src/Image/ImageBuilderInterface.php

@@ -0,0 +1,11 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\PreviewGenerator\Image;
+
+use Zend\ServiceManager\ServiceLocatorInterface;
+
+/** @deprecated  */
+interface ImageBuilderInterface extends ServiceLocatorInterface
+{
+}

module/PreviewGenerator/src/Image/ImageFactory.php

@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\PreviewGenerator\Image;
+
+use Interop\Container\ContainerInterface;
+use Interop\Container\Exception\ContainerException;
+use mikehaertl\wkhtmlto\Image;
+use Zend\ServiceManager\Exception\ServiceNotCreatedException;
+use Zend\ServiceManager\Exception\ServiceNotFoundException;
+use Zend\ServiceManager\Factory\FactoryInterface;
+
+/** @deprecated  */
+class ImageFactory implements FactoryInterface
+{
+    /**
+     * Create an object
+     *
+     * @param  ContainerInterface $container
+     * @param  string $requestedName
+     * @param  null|array $options
+     * @return object
+     * @throws ServiceNotFoundException if unable to resolve the service.
+     * @throws ServiceNotCreatedException if an exception is raised when
+     *     creating a service.
+     * @throws ContainerException if any other error occurs
+     */
+    public function __invoke(ContainerInterface $container, $requestedName, ?array $options = null)
+    {
+        $config = $container->get('config')['wkhtmltopdf'];
+        $image = new Image($config['images'] ?? null);
+
+        if ($options['url'] ?? null) {
+            $image->setPage($options['url']);
+        }
+
+        return $image;
+    }
+}

module/PreviewGenerator/src/Service/PreviewGenerator.php

@@ -0,0 +1,57 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\PreviewGenerator\Service;
+
+use mikehaertl\wkhtmlto\Image;
+use Shlinkio\Shlink\Common\Exception\PreviewGenerationException;
+use Shlinkio\Shlink\PreviewGenerator\Image\ImageBuilderInterface;
+use Symfony\Component\Filesystem\Filesystem;
+
+use function sprintf;
+use function urlencode;
+
+/** @deprecated */
+class PreviewGenerator implements PreviewGeneratorInterface
+{
+    /** @var string */
+    private $location;
+    /** @var ImageBuilderInterface */
+    private $imageBuilder;
+    /** @var Filesystem */
+    private $filesystem;
+
+    public function __construct(ImageBuilderInterface $imageBuilder, Filesystem $filesystem, string $location)
+    {
+        $this->location = $location;
+        $this->imageBuilder = $imageBuilder;
+        $this->filesystem = $filesystem;
+    }
+
+    /**
+     * Generates and stores preview for provided website and returns the path to the image file
+     *
+     * @throws PreviewGenerationException
+     */
+    public function generatePreview(string $url): string
+    {
+        $image = $this->imageBuilder->build(Image::class, ['url' => $url]);
+
+        // If the file already exists, return its path
+        $cacheId = sprintf('preview_%s.%s', urlencode($url), $image->type);
+        $path = $this->location . '/' . $cacheId;
+        if ($this->filesystem->exists($path)) {
+            return $path;
+        }
+
+        // Save and check if an error occurred
+        $image->saveAs($path);
+        $error = $image->getError();
+        if (! empty($error)) {
+            throw PreviewGenerationException::fromImageError($error);
+        }
+
+        // Cache the path and return it
+        return $path;
+    }
+}

module/PreviewGenerator/src/Service/PreviewGeneratorInterface.php

@@ -0,0 +1,17 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\PreviewGenerator\Service;
+
+use Shlinkio\Shlink\Common\Exception\PreviewGenerationException;
+
+/** @deprecated */
+interface PreviewGeneratorInterface
+{
+    /**
+     * Generates and stores preview for provided website and returns the path to the image file
+     *
+     * @throws PreviewGenerationException
+     */
+    public function generatePreview(string $url): string;
+}