140 lines
4.2 KiB
PHP
140 lines
4.2 KiB
PHP
<?php
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/*
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* Name: Handle SVG
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* Author: Shish <webmaster@shishnet.org>
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* Link: http://code.shishnet.org/shimmie2/
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* Description: Handle static SVG files. (No thumbnail is generated for SVG files)
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*/
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use enshrined\svgSanitize\Sanitizer;
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class SVGFileHandler extends Extension
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{
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public function onDataUpload(DataUploadEvent $event)
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{
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if ($this->supported_ext($event->type) && $this->check_contents($event->tmpname)) {
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$hash = $event->hash;
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$sanitizer = new Sanitizer();
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$sanitizer->removeRemoteReferences(true);
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$dirtySVG = file_get_contents($event->tmpname);
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$cleanSVG = $sanitizer->sanitize($dirtySVG);
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file_put_contents(warehouse_path("images", $hash), $cleanSVG);
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send_event(new ThumbnailGenerationEvent($event->hash, $event->type));
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$image = $this->create_image_from_data(warehouse_path("images", $hash), $event->metadata);
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if (is_null($image)) {
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throw new UploadException("SVG handler failed to create image object from data");
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}
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$iae = new ImageAdditionEvent($image);
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send_event($iae);
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$event->image_id = $iae->image->id;
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}
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}
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public function onThumbnailGeneration(ThumbnailGenerationEvent $event)
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{
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if ($this->supported_ext($event->type)) {
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$hash = $event->hash;
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copy("ext/handle_svg/thumb.jpg", warehouse_path("thumbs", $hash));
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}
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}
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public function onDisplayingImage(DisplayingImageEvent $event)
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{
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global $page;
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if ($this->supported_ext($event->image->ext)) {
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$this->theme->display_image($page, $event->image);
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}
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}
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public function onPageRequest(PageRequestEvent $event)
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{
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global $page;
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if ($event->page_matches("get_svg")) {
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$id = int_escape($event->get_arg(0));
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$image = Image::by_id($id);
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$hash = $image->hash;
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$page->set_type("image/svg+xml");
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$page->set_mode("data");
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$sanitizer = new Sanitizer();
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$sanitizer->removeRemoteReferences(true);
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$dirtySVG = file_get_contents(warehouse_path("images", $hash));
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$cleanSVG = $sanitizer->sanitize($dirtySVG);
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$page->set_data($cleanSVG);
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}
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}
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private function supported_ext(string $ext): bool
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{
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$exts = ["svg"];
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return in_array(strtolower($ext), $exts);
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}
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private function create_image_from_data(string $filename, array $metadata): Image
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{
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$image = new Image();
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$msp = new MiniSVGParser($filename);
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$image->width = $msp->width;
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$image->height = $msp->height;
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$image->filesize = $metadata['size'];
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$image->hash = $metadata['hash'];
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$image->filename = $metadata['filename'];
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$image->ext = $metadata['extension'];
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$image->tag_array = is_array($metadata['tags']) ? $metadata['tags'] : Tag::explode($metadata['tags']);
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$image->source = $metadata['source'];
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return $image;
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}
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private function check_contents(string $file): bool
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{
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if (!file_exists($file)) {
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return false;
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}
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$msp = new MiniSVGParser($file);
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return bool_escape($msp->valid);
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}
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}
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class MiniSVGParser
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{
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/** @var bool */
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public $valid=false;
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/** @var int */
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public $width=0;
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/** @var int */
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public $height=0;
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/** @var int */
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private $xml_depth=0;
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public function __construct(string $file)
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{
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$xml_parser = xml_parser_create();
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xml_set_element_handler($xml_parser, [$this, "startElement"], [$this, "endElement"]);
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$this->valid = bool_escape(xml_parse($xml_parser, file_get_contents($file), true));
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xml_parser_free($xml_parser);
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}
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public function startElement($parser, $name, $attrs)
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{
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if ($name == "SVG" && $this->xml_depth == 0) {
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$this->width = int_escape($attrs["WIDTH"]);
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$this->height = int_escape($attrs["HEIGHT"]);
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}
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$this->xml_depth++;
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}
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public function endElement($parser, $name)
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{
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$this->xml_depth--;
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}
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}
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