gnahotelsolutions / image-cacher

src/Cacher.php

<?php

namespace GNAHotelSolutions\ImageCacher;

use Exception;

class Cacher
{
    /** @var string  */
    protected $cachePath;

    /** @var string  */
    protected $cacheRootPath;

    /** @var string */
    protected $imagesRootPath;

    /** @var string */
    protected $outputFormat = null;

    const SUPPORTED_OUTPUT_FORMATS = [Format::WEBP];

    public function __construct(
        string $cachePath = 'cache/images',
        string $cacheRootPath = '',
        string $imagesRootPath = '',
        ?string $outputFormat = null
    ) {
        $this->cachePath = $cachePath;
        $this->cacheRootPath = rtrim($cacheRootPath, '/');
        $this->imagesRootPath = rtrim($imagesRootPath, '/');
        $this->outputFormat = $outputFormat;
    }

    public function setOutputFormat(string $format): self
    {
        if (! in_array($format, self::SUPPORTED_OUTPUT_FORMATS)) {
            throw new Exception("Cannot transform files into `{$format}` because is not a supported format.");
        }

        $this->outputFormat = $format;

        return $this;
    }

    public function resize($image, $width = null, $height = null): Image
    {
        return $this->manipulate($image, $width, $height, false);
    }

    public function crop($image, $width = null, $height = null): Image
    {
        return $this->manipulate($image, $width, $height, true);
    }

    protected function manipulate($image, $width = null, $height = null, bool $cropImage = false): Image
    {
        if (is_string($image)) {
            $image = new Image($image, $this->imagesRootPath);
        }

        if ($this->isSmallerThanRequested($image, $width, $height)) {
            return $image;
        }

        $resizedWidth = $width ?? round($height * $image->getAspectRatio());
        $resizedHeight = $height ?? round($width / $image->getAspectRatio());

        if ($this->outputFormat !== null && $this->outputFormat !== $image->getOutputFormat()) {
            $image->setOutputFormat($this->outputFormat);
        }

        if ($this->isAlreadyCached($image, $resizedWidth, $resizedHeight)) {
            return new Image($this->getCachedImagePathName($image, $resizedWidth, $resizedHeight), $this->cacheRootPath);
        }

        $layout = imagecreatetruecolor($resizedWidth, $resizedHeight);

        if ($this->isAlpha($image)) {
            imagealphablending($layout, false);
            imagesavealpha($layout, true);
        }

        if ($cropImage) {
            [$cutWidth, $cutHeight] = $this->getCutEdges($image, $resizedWidth, $resizedHeight);

The variable $cutWidth seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition?

The variable $cutHeight seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition?

            $cutX = ($image->getWidth() - $cutWidth) / 2;

The variable $cutWidth seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition?

            $cutY = ($image->getHeight() - $cutHeight) / 2;

The variable $cutHeight seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition?

        } else {
            $cutWidth = $image->getWidth();
            $cutHeight = $image->getHeight();
            $cutX = 0;
            $cutY = 0;
        }

        imagecopyresampled($layout, $this->getImageResource($image), 0, 0, $cutX, $cutY, $resizedWidth, $resizedHeight, $cutWidth, $cutHeight);

The variable $cutWidth does not seem to be defined for all execution paths leading up to this point.

The variable $cutHeight does not seem to be defined for all execution paths leading up to this point.

        $this->saveImage($image, $layout, $resizedWidth, $resizedHeight);

        return new Image($this->getCachedImagePathName($image, $resizedWidth, $resizedHeight), $this->cacheRootPath);
    }

    protected function isSmallerThanRequested(Image $image, $width, $height): bool
    {
        return (! $width && ! $height) || $image->isSmallerThan($width, $height);
    }

    protected function isAlreadyCached(Image $image, $width, $height): bool
    {
        return file_exists($this->getCachedImageFullName($image, $width, $height))
            && $this->cachedImageIsTheSame($image, $width, $height);
    }

    protected function cachedImageIsTheSame(Image $image, $width, $height): bool
    {
        $cachedImageUpdatedAt = filemtime($this->getCachedImageFullName($image, $width, $height));
        $imageUpdatedAt = filemtime($image->getOriginalFullPath());

        return $cachedImageUpdatedAt >= $imageUpdatedAt;
    }

    protected function getCachedImageFullName(Image $image, $width, $height): string
    {
        if ($this->cacheRootPath === '') {
            return $this->getCachedImagePathName($image, $width, $height);
        }

        return "{$this->cacheRootPath}/{$this->getCachedImagePathName($image, $width, $height)}";
    }

    protected function getCachedImagePathName(Image $image, $width, $height): string
    {
        return "{$this->cachePath}/{$this->getCachedImageName($image, $width, $height)}";
    }

    protected function getCachedImageName(Image $image, $width, $height): string
    {
        return "{$this->getCacheImagePath($image->getPath(), $width, $height)}/{$image->getName()}";
    }

    protected function getCacheImagePath(string $path, $width, $height): string
    {
        return ltrim("{$path}/{$width}x{$height}", '/');
    }

    protected function isAlpha(Image $image): bool
    {
        return in_array($image->getType(), [Format::GIF, Format::PNG]);
    }

    protected function getImageResource(Image $image)
    {
        return Manipulator::create($image->getOutputFormat(), $image->getOriginalFullPath());
    }

    protected function getCutEdges(Image $image, int $width, int $height): array
    {
        $aspectRatio = $width / $height;

        $cutEdgeWidth = round($image->getHeight() * $aspectRatio);

        if ($cutEdgeWidth > $image->getWidth()) {
            $cutEdgeWidth = $image->getWidth();
        }

        $cutEdgeHeight = round($cutEdgeWidth / $aspectRatio);

        return [$cutEdgeWidth, $cutEdgeHeight];
    }

    protected function saveImage(Image $image, $layout, $width, $height): string
    {
        $this->createCacheDirectoryIfNotExists($image, $width, $height);

        return Manipulator::save($image->getOutputFormat(), $layout, $this->getCachedImageFullName($image, $width, $height));
    }

    protected function createCacheDirectoryIfNotExists(Image $image, $width, $height): void
    {
        $cachePath = "{$this->cacheRootPath}/{$this->cachePath}/{$this->getCacheImagePath($image->getPath(), $width, $height)}";

        if (! in_array(substr($cachePath, 0, 1), ['', '/'])) {
            $cachePath = "/{$cachePath}";
        }

        if (! file_exists($cachePath)) {
            mkdir($cachePath, 0777, true);
        }
    }
}