229 lines
7.4 KiB
PHP
229 lines
7.4 KiB
PHP
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<?php
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namespace Grav\Plugin;
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use Grav\Common\Plugin;
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use Grav\Common\Page\Page;
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use Grav\Common\Flex\Types\Pages\PageObject;
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use RocketTheme\Toolbox\Event\Event;
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use Grav\Common\Data;
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use Grav\Common\Grav;
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use PHPHtmlParser\Dom;
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use PHPHtmlParser\Options;
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require_once 'adapters/imagick.php';
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require_once 'adapters/gd.php';
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/**
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* Class AutomagicImagesPlugin
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* @package Grav\Plugin
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*/
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class AutomagicImagesPlugin extends Plugin
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{
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/**
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* @var string
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*/
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protected $adapter;
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/**
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* @var array
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*/
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protected $sizes;
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/**
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* @return array
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*/
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public static function getSubscribedEvents()
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{
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return [
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'onAdminSave' => ['onAdminSave', 0],
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'onOutputGenerated' => ['onOutputGenerated', 0]
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];
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}
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/**
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* Determine whether a particular dependency is installed.
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* @param string $adapter Either 'gd' or 'imagick'
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* @return bool
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*/
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protected function dependencyCheck($adapter = 'gd')
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{
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if ($adapter === 'gd') {
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return extension_loaded('gd');
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}
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if ($adapter === 'imagick') {
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return class_exists('\Imagick');
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}
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}
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/**
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* Determine which adapter is preferred and whether or not it's available.
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* Construct an instance of that adapter and return it.
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* @param string $source - Source image path
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* @return mixed - Either an instance of ImagickAdapter, GDAdapter or false if none of the extensions were available
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*/
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protected function getImageAdapter($source)
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{
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$imagick_exists = $this->dependencyCheck('imagick');
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$gd_exists = $this->dependencyCheck('gd');
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if ($this->adapter === 'imagick') {
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if ($imagick_exists) {
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return new ImagickAdapter($source);
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} else if ($gd_exists) {
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return new GDAdapter($source);
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}
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} else if ($this->adapter === 'gd') {
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if ($gd_exists) {
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return new GDAdapter($source);
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} else if ($imagick_exists) {
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return new ImagickAdapter($source);
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}
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}
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}
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/**
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* Resizes an image using either Imagick or GD
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* @param string $source - Source image path
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* @param string $target - Target image path
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* @param float $width - Target width
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* @param float $height - Target height
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* @param int [$quality=95] - Compression quality for target image
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* @return bool - Returns true on success, otherwise false
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*/
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protected function resizeImage($source, $target, $width, $height, $quality = 95)
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{
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$adapter = $this->getImageAdapter($source);
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$adapter->resize($width, $height);
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$adapter->setQuality($quality);
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return $adapter->save($target);
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}
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/**
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* Called when a page is saved from the admin plugin. Will generate
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* responsive image alternatives for images that don't have any.
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*/
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public function onAdminSave($event)
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{
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$page = $event['object'];
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if (!($page instanceof Page || $page instanceof PageObject)) {
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return false;
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}
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if (!$this->dependencyCheck('imagick') && !$this->dependencyCheck('gd')) {
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$this->grav['admin']->setMessage('Neither Imagick nor GD seem to be installed. Automagic Images needs one of them to work.', 'warning');
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return;
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}
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$this->sizes = (array) $this->config->get('plugins.automagic-images.sizes');
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$this->adapter = $this->config->get('plugins.automagic-images.adapter', 'imagick');
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foreach ($page->media()->images() as $filename => $medium) {
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$srcset = $medium->srcset(false);
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if ($srcset != '') {
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continue;
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}
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// We can't rely on the path returned from the image's own path
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// method, since it points to the directory where the image is saved
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// rather than where the original is stored. This means it could
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// point to the global image cache directory.
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$page_path = $page->path();
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$source_path = "$page_path/$filename";
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$info = pathinfo($source_path);
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$count = 0;
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foreach ($this->sizes as $i => $size) {
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if ($size['width'] >= $medium->width) {
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continue;
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}
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$count++;
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$basename = str_replace(" ", "-", $info['filename']);
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$ext = strtolower($info['extension']);
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$dest_path = "{$info['dirname']}/{$basename}@{$count}x.{$ext}";
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$width = $size['width'];
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$quality = $size['quality'];
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$height = ($width / $medium->width) * $medium->height;
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$this->resizeImage($source_path, $dest_path, $width, $height, $quality, $medium->width, $medium->height);
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}
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$remove_original = $this->config->get('plugins.automagic-images.remove_original');
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if ($count > 0) {
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$original_index = $count + 1;
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if ($remove_original) {
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unlink($source_path);
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} else {
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rename($source_path, "{$info['dirname']}/{$basename}@{$original_index}x.{$ext}");
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}
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$fixed_source = str_replace($info['filename'], $basename, $source_path);
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$fixed_source = str_replace($info['extension'], $ext, $fixed_source);
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rename("{$info['dirname']}/{$basename}@1x.{$ext}", $fixed_source);
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}
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$message = "Resized $filename $count times";
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if ($remove_original) {
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$message .= ' (and removed the original image)';
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}
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$this->grav['admin']->setMessage($message, 'info');
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}
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}
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/**
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* Iterates over images in page content that was generated via twig and adds
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* sizes attribute (not cacheable)
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*
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* @return void
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*/
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public function onOutputGenerated()
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{
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if ($this->isAdmin()) {
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return;
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}
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$config = (array) $this->config->get('plugins.automagic-images');
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$page = $this->grav['page'];
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// dump($this->grav->output); exit;
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$config = $this->mergeConfig($page);
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if ($config['enabled']) {
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include __DIR__ . '/vendor/autoload.php';
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$dom = new Dom;
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$dom->loadStr($this->grav->output,
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(new Options())->setCleanupInput(false)
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);
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$images = $dom->find('img');
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$arrClasses = [];
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foreach ($config['sizesattr'] as $array) {
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$arrClasses[$array['class']] = $array['directive'];
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}
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foreach ($images as $image) {
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$sizesattr = "";
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$classes = explode(" ", $image->getAttribute('class'));
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foreach ($classes as $class) {
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if (array_key_exists($class, $arrClasses)) {
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$sizesattr = $arrClasses[$class];
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}
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}
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if ($sizesattr == "") {
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if (array_key_exists('default', $arrClasses)) {
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$sizesattr = $arrClasses['default'];
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}
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}
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if ($sizesattr != "") {
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$image->setAttribute('sizes', $sizesattr);
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}
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}
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$this->grav->output = $dom->outerHtml;
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}
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}
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}
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