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Thumbnails.php
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Thumbnails.php
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<?php
namespace Tatter\Thumbnails;
use CodeIgniter\Files\Exceptions\FileNotFoundException;
use CodeIgniter\Files\File;
use Tatter\Handlers\Handlers;
use Tatter\Thumbnails\Config\Thumbnails as ThumbnailsConfig;
use Tatter\Thumbnails\Exceptions\ThumbnailsException;
use Tatter\Thumbnails\Interfaces\ThumbnailInterface;
class Thumbnails
{
/**
* The configuration instance.
*
* @var ThumbnailsConfig
*/
protected $config;
/**
* Output width.
*
* @var int
*/
protected $width;
/**
* Output height.
*
* @var int
*/
protected $height;
/**
* The image type constant.
*
* @var int
*
* @see https://www.php.net/manual/en/function.image-type-to-mime-type.php
*/
protected $imageType;
/**
* Overriding name of a handler to use.
*
* @var string|null
*/
protected $handler;
/**
* The library for handler discovery.
*
* @var Handlers
*/
protected $handlers;
/**
* Initializes the library with its configuration.
*/
public function __construct(?ThumbnailsConfig $config = null)
{
$this->setConfig($config);
$this->handlers = new Handlers('Thumbnails');
}
/**
* Resets library state to the provided configuration.
* Called between each create()
*
* @return $this
*/
public function reset(): self
{
foreach (['width', 'height', 'imageType'] as $key) {
$this->{$key} = $this->config->{$key};
}
$this->handler = null;
return $this;
}
/**
* Sets the configuration to use.
*
* @return $this
*/
public function setConfig(?ThumbnailsConfig $config = null): self
{
$this->config = $config ?? config('Thumbnails');
$this->reset();
return $this;
}
/**
* Sets the output image type.
*
* @return $this
*/
public function setImageType(int $imageType): self
{
$this->imageType = $imageType;
return $this;
}
/**
* Sets the output image width.
*
* @return $this
*/
public function setWidth(int $width): self
{
$this->width = $width;
return $this;
}
/**
* Sets the output image height.
*
* @return $this
*/
public function setHeight(int $height): self
{
$this->height = $height;
return $this;
}
//--------------------------------------------------------------------
/**
* Specifies the handler to use instead of matching it automatically.
*
* @param string|ThumbnailInterface|null $handler
*
* @return $this
*/
public function setHandler($handler = null): self
{
if (is_string($handler) && $class = $this->handlers->find($handler)) {
$handler = new $class();
}
$this->handler = $handler;
return $this;
}
/**
* Gets all handlers that support a certain file extension.
*
* @param string $extension The file extension to match
*
* @return ThumbnailInterface[]
*/
public function matchHandlers(string $extension): array
{
$handlers = [];
// Check all handlers so we can parse the extensions attribute properly
foreach ($this->handlers->findAll() as $class) {
$instance = new $class();
if ($instance->extensions === '*') {
$handlers[] = $instance;
} elseif (stripos($instance->extensions, $extension) !== false) {
// Make sure actual matches get preference over generic ones
array_unshift($handlers, $instance);
}
}
return $handlers;
}
//--------------------------------------------------------------------
/**
* Reads and verifies the file then passes to a supported handler to
* create the thumbnail.
*
* @param string $input Path to the input file
* @param string $output Path to the output file
*
* @throws FileNotFoundException
* @throws ThumbnailsException
*
* @return $this
*/
public function create(string $input, string $output): self
{
// Validate the file
$file = new File($input);
if (! $file->isFile()) {
throw FileNotFoundException::forFileNotFound($input);
}
// Get the file extension
if (! $extension = $file->guessExtension() ?? pathinfo($input, PATHINFO_EXTENSION)) {
throw new ThumbnailsException(lang('Thumbnails.noExtension'));
}
// Determine which handlers to use
$handlers = $this->handler ? [$this->handler] : $this->matchHandlers($extension);
// No handlers matched?
if (empty($handlers)) {
throw new ThumbnailsException(lang('Thumbnails.noHandler', [$extension]));
}
// Try each handler until one succeeds
$result = false;
foreach ($handlers as $handler) {
if (! $handler->create($file, $output, $this->imageType, $this->width, $this->height)) {
continue;
}
// Verify the output file
if (exif_imagetype($output) !== $this->imageType) {
continue;
}
$result = true;
break;
}
$this->reset();
if (! $result) {
throw new ThumbnailsException(lang('Thumbnails.createFailed', [$input]));
}
return $this;
}
}