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Added image proxy extension

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This commit is contained in:
Frans de Jonge 2016-05-12 21:37:15 +02:00
parent 6c7a506f7b
commit e0def49cef
5 changed files with 772 additions and 0 deletions
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68
xExtension-ImageProxy/extension.php Normal file
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<?php
class ImageProxyExtension extends Minz_Extension {
public function init() {
$this->registerHook('entry_before_display',
array('ImageProxyExtension', 'setImageProxyHook'));
if (FreshRSS_Context::$user_conf->image_proxy_url != '') {
self::$proxy_url = FreshRSS_Context::$user_conf->image_proxy_url;
}
}
public static $proxy_url = 'https://images.weserv.nl/?url=';
public function handleConfigureAction() {
$this->registerTranslates();
if (Minz_Request::isPost()) {
FreshRSS_Context::$user_conf->image_proxy_url = Minz_Request::param('image_proxy_url', '');
FreshRSS_Context::$user_conf->save();
}
}
public static function getProxyImageUri($url) {
$parsed_url = parse_url($url);
if (isset($parsed_url['scheme']) && $parsed_url['scheme'] === 'http') {
$url = self::$proxy_url . rawurlencode(substr($url, strlen('http://')));
}
// oddly enough there are protocol-less IMG SRC attributes that don't actually work with HTTPS
// so I guess we should just run 'em all through the proxy
else if (empty($parsed_url['scheme'])) {
$url = self::$proxy_url . rawurlencode($url);
}
return $url;
}
public static function getSrcSetUris($matches) {
return str_replace($matches[1], self::getProxyImageUri($matches[1]), $matches[0]);
}
public static function swapUris($content) {
$doc = new DOMDocument();
libxml_use_internal_errors(true); // prevent tag soup errors from showing
$doc->loadHTML(mb_convert_encoding($content, 'HTML-ENTITIES', 'UTF-8'));
$imgs = $doc->getElementsByTagName('img');
foreach ($imgs as $img) {
if ($img->hasAttribute('src')) {
$newSrc = self::getProxyImageUri($img->getAttribute('src'));
$img->setAttribute('src', $newSrc);
}
if ($img->hasAttribute('srcset')) {
$newSrcSet = preg_replace_callback('/(?:([^\s,]+)(\s*(?:\s+\d+[wx])(?:,\s*)?))/', 'self::getSrcSetUris', $img->getAttribute('srcset'));
$img->setAttribute('srcset', $newSrcSet);
}
}
return $doc->saveHTML();
}
public static function setImageProxyHook($entry) {
$entry->_content(
self::swapUris($entry->content())
);
return $entry;
}
}