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<?php namespace YOOtheme; class ImageProvider { public const IMAGE = '/<(?:div\|img)\s+[^>]?((\w+-)?src=((["\'])[^\'"]+?\.(?:gif\|png\|jpe?g\|webp\|avif)#[^\'"]+?\4))[^>]>/i'; public const VERSION = '2'; /** * @var string / public $cache; /* * @var string / public $route; /* * @var string / protected $secret; /* * @var array / protected $params = []; /* * @var array / protected $loaders = []; /* * Constructor. * * @param string $cache * @param array $config / public function __construct($cache, array $config = []) { $this->cache = Path::resolve($cache); $this->route = $config['route'] ?? '@image'; $this->secret = $config['secret'] ?? filemtime(__FILE__); $this->params = $config['params'] ?? []; } /* * Adds a loader callback. * * @param callable $loader * * @return static / public function addLoader(callable $loader) { $this->loaders[] = $loader; return $this; } /* * Creates an Image object from src attribute's relative URL. * * @param string $src * @param bool $resource * * @return Image\|void / public function create($src, $resource = true) { [$file, $params] = $this->parse($src); if (Path::isAbsolute($file) \|\| str_ends_with(strtolower($file), '.svg')) { return; } $image = new Image($file, $resource); $image->setAttribute('src', $src); if ($image->getType()) { $image = $image->setAttribute('params', $params); foreach ($this->loaders as $loader) { $image = $loader($image, $this) ?: $image; } return $image; } } /* * Parse image url. * * @param string $url * * @return array / public function parse($url) { $url = urldecode($url); $file = parse_url($url, PHP_URL_PATH); $data = parse_url($url, PHP_URL_FRAGMENT) ?: ''; // replace params if ($this->params) { $data = strtr($data, $this->params); } // parse params parse_str($data, $params); return [$file, $params]; } /* * Replace images in HTML. * * @param string $text * * @return string / public function replace($text) { if (stripos($text, '<div') !== false \|\| stripos($text, '<img') !== false) { return preg_replace_callback(static::IMAGE, [$this, 'replaceCallback'], $text); } return $text; } /* * Replace image callback. * * @param array $matches * * @return string / public function replaceCallback($matches) { [$element, $src, $prefix, $source] = $matches; $url = html_entity_decode(trim($source, "\"'")); if ($image = $this->create($url, false)) { // load sources $sources = $this->getSources($image); // apply params $attrs = $this->getSrcsetAttrs($image, $prefix); $image = $image->apply($image->getAttribute('params')); // skip srcset and sizes attributes if additional sources are found if ($sources) { $attrs = array_slice($attrs, 0, 1); } // add sources to attrs for none image tags if ($isImage = str_starts_with($element, '<img')) { $sources = static::getSourceElements($sources, $prefix); // set width if (!str_contains($element, 'width=')) { $attrs['width'] = $image->width; } // set height if (!str_contains($element, 'height=')) { $attrs['height'] = $image->height; } } else { $attrs["{$prefix}sources"] = json_encode($sources); } // add image $image = str_replace($src, static::getAttrs($attrs), $element); // use picture? if ($sources && $isImage) { return join("\n", array_merge(['<picture>'], $sources, [$image, '</picture>'])); } return $image; } return $element; } /* * Gets the image hash. * * @param string $data * * @return string / public function getHash($data) { return hash('fnv132', hash_hmac('sha1', static::VERSION . '-' . $data, $this->secret)); } /* * Gets the image URL. * * @param string\|Image $image * * @return string\|null / public function getUrl($image) { $cached = null; if (is_string($image)) { if (!($image = $this->create($src = $image, false))) { return Url::to($src); } $image = $image->apply($image->getAttribute('params')); } if ($hash = $image->getHash()) { $cached = $image->getFilename(Path::join($this->cache, substr($hash, 0, 2))); } // url to source if (is_null($cached)) { return Url::to($image->getFile()); } // url to cached image if (is_file($cached)) { return Url::to($cached); } return Url::route($this->route, [ 'src' => ($src = strval($image)), 'hash' => $this->getHash($src), ]); } /* * Gets the image sources (webp, ...). * * @param Image $image * @param int $minWidth * * @return string[][] / public function getSources(Image $image, $minWidth = 0) { $sources = []; foreach ($image->getAttribute('types', []) as $mime => $type) { $image = $image->apply(['type' => $type]); $attrs = array_slice($this->getSrcsetAttrs($image, '', $minWidth), 1); $sources[] = ['type' => $mime] + $attrs; } return $sources; } /* * Gets the image source set. * * @param Image $image * * @return array / public function getSrcset(Image $image) { $params = $image->getAttribute('params'); if (!isset($params['srcset'])) { return []; } $imageDst = $image->apply($params); $maxWidth = min(max($image->width, $imageDst->width), $imageDst->width 2); $maxHeight = min(max($image->height, $imageDst->height), $imageDst->height * 2); if (!$maxWidth \|\| !$maxHeight) { return []; } foreach (explode(',', $params['srcset']) as $value) { $resized = $imageDst->resize($value); // if oversized, use original image sizes if (1 < ($scale = max($resized->width / $maxWidth, $resized->height / $maxHeight))) { $sizes = [round($resized->width / $scale), round($resized->height / $scale)]; } else { $sizes = [$resized->width, $resized->height]; } // set image parameters $parameters = array_map( fn($val) => join(',', $sizes + explode(',', $val)), static::filterParams($params), ); $resized = $image->apply($parameters); $images[$resized->width] = $resized; } $images[$imageDst->width] = $imageDst; ksort($images); return $images; } public function getSrcsetAttrs(Image $image, $prefix = '', $minWidth = 0) { $images = $this->getSrcset($image); $params = $image->getAttribute('params'); $image = $image->apply($params); $attrs = ["{$prefix}src" => $this->getUrl($image)]; foreach ($images as $img) { if ($minWidth && $img->width < $minWidth) { continue; } $srcset[] = "{$this->getUrl($img)} {$img->width}w"; } if (isset($srcset)) { // merge default sizes $params = array_merge( [ 'sizes' => "(min-width: {$image->width}px) {$image->width}px", ], $params, ); // set image srcset/sizes $attrs["{$prefix}srcset"] = join(', ', $srcset); $attrs["{$prefix}sizes"] = $params['sizes']; } return $attrs; } /** * Gets the image info. * * @param string $file * * @return array\|void / public static function getInfo($file) { static $cache = []; if (isset($cache[$file])) { return $cache[$file]; } if ($data = @getimagesize($file, $info)) { return $cache[$file] = [$data[0], $data[1], substr($data['mime'], 6), $info]; } } /* * Gets the image attributes. * * @param array $attributes * * @return string / public static function getAttrs(array $attributes) { $attrs = []; foreach ($attributes as $key => $value) { $attrs[] = sprintf('%1$s="%2$s"', $key, htmlspecialchars($value)); } return join(' ', $attrs); } /* * @param array $sources * @param string $prefix * * @return array / protected static function getSourceElements($sources, $prefix) { $elements = []; foreach ($sources as $source) { if ($prefix) { $source["{$prefix}srcset"] = $source['srcset']; unset($source['srcset']); } $elements[] = '<source ' . static::getAttrs($source) . '>'; } return $elements; } /* * Filter image parameters. */ protected static function filterParams($params) { return array_intersect_key($params, array_flip(['crop', 'resize', 'thumbnail'])); } }

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