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403<?php
namespace Directus\Filesystem;
use Directus\Util\ArrayUtils;
use Intervention\Image\ImageManagerStatic as Image;
use Exception;
class Thumbnailer {
/**
* Thumbnail params extracted from url
*
* @var array
*/
private $thumbnailParams = [];
/**
* Files instance
*
* @var Directus\Filesystem\Files
*/
private $files;
/**
* Thumbnailer config
*
* @var array
*/
private $config = [];
/**
* Constructor
*
* @param Directus\Filesystem\Files $files
* @param Array $config
* @param string $thumbnailUrlPath
* in the form '100\100\crop\good\some-image.jpg'
*/
public function __construct(\Directus\Filesystem\Files $files, Array $thumbnailerConfig, $thumbnailUrlPath = '')
{
try {
$this->files = $files;
$this->config = $thumbnailerConfig;
$this->thumbnailParams = $this->extractThumbnailParams($thumbnailUrlPath);
// check if the original file exists in storage
if (! $this->files->exists($this->fileName)) {
throw new Exception($this->fileName . ' does not exist.'); // original file doesn't exist
}
// check if dimensions are supported
if (! $this->isSupportedThumbnailDimension($this->width, $this->height)) {
throw new Exception('Invalid dimensions.');
}
// check if action is supported
if ( $this->action && ! $this->isSupportedAction($this->action)) {
throw new Exception('Invalid action.');
}
// check if quality is supported
if ( $this->quality && ! $this->isSupportedQualityTag($this->quality)) {
throw new Exception('Invalid quality.');
}
// relative to configuration['filesystem']['root']
$this->thumbnailDir = 'thumbs/' . $this->width . '/' . $this->height . ($this->action ? '/' . $this->action : '') . ($this->quality ? '/' . $this->quality : '');
}
catch (Exception $e) {
throw $e;
}
}
/**
* Magic getter for thumbnailParams
*
* @param string $key
* @return string|int
*/
public function __get($key)
{
return ArrayUtils::get($this->thumbnailParams, $key, null);
}
/**
* Return thumbnail as data
*
* @throws Exception
* @return string|null
*/
public function get()
{
try {
if( $this->files->exists($this->thumbnailDir . '/' . $this->fileName) ) {
$img = $this->files->read($this->thumbnailDir . '/' . $this->fileName);
}
return isset($img) && $img ? $img : null;
}
catch (Exception $e) {
throw $e;
}
}
/**
* Get thumbnail mime type
*
* @throws Exception
* @return string
*/
public function getThumbnailMimeType()
{
try {
if( $this->files->exists($this->thumbnailDir . '/' . $this->fileName) ) {
$img = Image::make($this->files->read($this->thumbnailDir . '/' . $this->fileName));
return $img->mime();
}
return 'application/octet-stream';
}
catch (Exception $e) {
throw $e;
}
}
/**
* Create thumbnail from image and `contain`
* http://image.intervention.io/api/resize
* https://css-tricks.com/almanac/properties/o/object-fit/
*
* @throws Exception
* @return string
*/
public function contain()
{
try {
// action options
$options = $this->getSupportedActionOptions($this->action);
// open file image resource
$img = Image::make($this->files->read($this->fileName));
// crop image
$img->resize($this->width, $this->height, function ($constraint) {
$constraint->aspectRatio();
});
if( ArrayUtils::get($options, 'resizeCanvas')) {
$img->resizeCanvas($this->width, $this->height, ArrayUtils::get($options, 'position', 'center'), ArrayUtils::get($options, 'resizeRelative', false), ArrayUtils::get($options, 'canvasBackground', [255, 255, 255, 0]));
}
$encodedImg = (string) $img->encode(ArrayUtils::get($this->thumbnailParams, 'fileExt'), ($this->quality ? $this->translateQuality($this->quality) : null));
$this->files->write($this->thumbnailDir . '/' . $this->fileName, $encodedImg);
return $encodedImg;
}
catch (Exception $e) {
throw $e;
}
}
/**
* Create thumbnail from image and `crop`
* http://image.intervention.io/api/fit
* https://css-tricks.com/almanac/properties/o/object-fit/
*
* @throws Exception
* @return string
*/
public function crop()
{
try {
// action options
$options = $this->getSupportedActionOptions($this->action);
// open file image resource
$img = Image::make($this->files->read($this->fileName));
// resize/crop image
$img->fit($this->width, $this->height, function($constraint){}, ArrayUtils::get($options, 'position', 'center'));
$encodedImg = (string) $img->encode(ArrayUtils::get($this->thumbnailParams, 'fileExt'), ($this->quality ? $this->translateQuality($this->quality) : null));
$this->files->write($this->thumbnailDir . '/' . $this->fileName, $encodedImg);
return $encodedImg;
}
catch (Exception $e) {
throw $e;
}
}
/**
* Parse url and extract thumbnail params
*
* @param string $thumbnailUrlPath
* @throws Exception
* @return array
*/
public function extractThumbnailParams($thumbnailUrlPath)
{
try {
if ($this->thumbnailParams) {
return $this->thumbnailParams;
}
$urlSegments = explode('/', $thumbnailUrlPath);
if (! $urlSegments) {
throw new Exception('Invalid thumbnailUrlPath.');
}
// pop off the filename
$fileName = ArrayUtils::pop($urlSegments);
// make sure filename is valid
$info = pathinfo($fileName);
if (!$this->isSupportedFileExtension(ArrayUtils::get($info, 'extension'))) {
throw new Exception('Invalid file extension.');
}
$thumbnailParams = [
'fileName' => $fileName,
'fileExt' => ArrayUtils::get($info, 'extension')
];
foreach ($urlSegments as $segment) {
if (! $segment) continue;
// extract width and height
if (is_numeric($segment)) {
if (! ArrayUtils::get($thumbnailParams, 'width')) {
ArrayUtils::set($thumbnailParams, 'width', $segment);
} else if (! ArrayUtils::get($thumbnailParams, 'height')) {
ArrayUtils::set($thumbnailParams, 'height', $segment);
}
}
// extract action and quality
else {
if (! ArrayUtils::get($thumbnailParams, 'action')) {
ArrayUtils::set($thumbnailParams, 'action', $segment);
} else if (! ArrayUtils::get($thumbnailParams, 'quality')) {
ArrayUtils::set($thumbnailParams, 'quality', $segment);
}
}
}
// validate
if (! ArrayUtils::contains($thumbnailParams, [
'width',
'height'
])) {
throw new Exception('No height or width provided.');
}
// set default action, if needed
if (! ArrayUtils::exists($thumbnailParams, 'action')) {
ArrayUtils::set($thumbnailParams, 'action', null);
}
// set quality to null, if needed
if (! ArrayUtils::exists($thumbnailParams, 'quality')) {
ArrayUtils::set($thumbnailParams, 'quality', null);
}
return $thumbnailParams;
}
catch (Exception $e) {
throw $e;
}
}
/**
* Translate quality text to number and return
*
* @param string $qualityText
* @return number
*/
public function translateQuality($qualityText)
{
return ArrayUtils::get($this->getSupportedQualityTags(), $qualityText, 50);
}
/**
* Check if given file extension is supported
*
* @param int $ext
* @return boolean
*/
public function isSupportedFileExtension($ext)
{
return in_array(strtolower($ext), $this->getSupportedFileExtensions());
}
/**
* Return supported image file types
*
* @return array
*/
public function getSupportedFileExtensions()
{
return Thumbnail::getFormatsSupported();
}
/**
* Check if given dimension is supported
*
* @param int $width
* @param int $height
* @return boolean
*/
public function isSupportedThumbnailDimension($width, $height)
{
return in_array($width . 'x' . $height, $this->getSupportedThumbnailDimensions());
}
/**
* Return supported thumbnail file dimesions
*
* @return array
*/
public function getSupportedThumbnailDimensions()
{
return ArrayUtils::get($this->getConfig(), 'supportedThumbnailDimensions');
}
/**
* Check if given action is supported
*
* @param int $action
* @return boolean
*/
public function isSupportedAction($action)
{
return ArrayUtils::has($this->getSupportedActions(), $action);
}
/**
* Return supported actions
*
* @return array
*/
public function getSupportedActions()
{
return ArrayUtils::get($this->getConfig(), 'supportedActions');
}
/**
* Check if given quality is supported
*
* @param int $action
* @return boolean
*/
public function isSupportedQualityTag($qualityTag)
{
return ArrayUtils::has($this->getSupportedQualityTags(), $qualityTag);
}
/**
* Return supported thumbnail qualities
*
* @return array
*/
public function getSupportedQualityTags()
{
return ArrayUtils::get($this->getConfig(), 'supportedQualityTags');
}
/**
* Return supported action options as set in config
*
* @param string $action
*
* @return array
*/
public function getSupportedActionOptions($action)
{
$options = ArrayUtils::get($this->getConfig(), 'supportedActions.' . $action . '.options', []);
return is_array($options) ? $options : [];
}
/**
* Merge file and thumbnailer config settings and return
*
* @throws Exception
* @return array
*/
public function getConfig()
{
return $this->config;
}
}