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extension.php
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extension.php
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<?php
declare(strict_types=1);
final class ImageProxyExtension extends Minz_Extension {
// Defaults
private const PROXY_URL = 'https://wsrv.nl/?url=';
private const SCHEME_HTTP = '1';
private const SCHEME_HTTPS = '';
private const SCHEME_DEFAULT = 'auto';
private const SCHEME_INCLUDE = '';
private const URL_ENCODE = '1';
public function init(): void {
if (!FreshRSS_Context::hasSystemConf()) {
throw new FreshRSS_Context_Exception('System configuration not initialised!');
}
$this->registerHook(
'entry_before_display',
array('ImageProxyExtension', 'setImageProxyHook')
);
// Defaults
$save = false;
if (is_null(FreshRSS_Context::userConf()->image_proxy_url)) {
FreshRSS_Context::userConf()->image_proxy_url = self::PROXY_URL;
$save = true;
}
if (is_null(FreshRSS_Context::userConf()->image_proxy_scheme_http)) {
FreshRSS_Context::userConf()->image_proxy_scheme_http = self::SCHEME_HTTP;
$save = true;
}
if (is_null(FreshRSS_Context::userConf()->image_proxy_scheme_https)) {
FreshRSS_Context::userConf()->image_proxy_scheme_https = self::SCHEME_HTTPS;
// Legacy
if (!is_null(FreshRSS_Context::userConf()->image_proxy_force)) {
FreshRSS_Context::userConf()->image_proxy_scheme_https = FreshRSS_Context::userConf()->image_proxy_force;
FreshRSS_Context::userConf()->image_proxy_force = null; // Minz -> unset
}
$save = true;
}
if (is_null(FreshRSS_Context::userConf()->image_proxy_scheme_default)) {
FreshRSS_Context::userConf()->image_proxy_scheme_default = self::SCHEME_DEFAULT;
$save = true;
}
if (is_null(FreshRSS_Context::userConf()->image_proxy_scheme_include)) {
FreshRSS_Context::userConf()->image_proxy_scheme_include = self::SCHEME_INCLUDE;
$save = true;
}
if (is_null(FreshRSS_Context::userConf()->image_proxy_url_encode)) {
FreshRSS_Context::userConf()->image_proxy_url_encode = self::URL_ENCODE;
$save = true;
}
if ($save) {
FreshRSS_Context::userConf()->save();
}
}
public function handleConfigureAction(): void {
$this->registerTranslates();
if (Minz_Request::isPost()) {
FreshRSS_Context::userConf()->image_proxy_url = Minz_Request::paramString('image_proxy_url', true) ?: self::PROXY_URL;
FreshRSS_Context::userConf()->image_proxy_scheme_http = Minz_Request::paramString('image_proxy_scheme_http');
FreshRSS_Context::userConf()->image_proxy_scheme_https = Minz_Request::paramString('image_proxy_scheme_https');
FreshRSS_Context::userConf()->image_proxy_scheme_default = Minz_Request::paramString('image_proxy_scheme_default') ?: self::SCHEME_DEFAULT;
FreshRSS_Context::userConf()->image_proxy_scheme_include = Minz_Request::paramString('image_proxy_scheme_include');
FreshRSS_Context::userConf()->image_proxy_url_encode = Minz_Request::paramString('image_proxy_url_encode');
FreshRSS_Context::userConf()->save();
}
}
public static function getProxyImageUri(string $url): string {
$parsed_url = parse_url($url);
$scheme = isset($parsed_url['scheme']) ? $parsed_url['scheme'] : null;
if ($scheme === 'http') {
if (!FreshRSS_Context::userConf()->image_proxy_scheme_http) {
return $url;
}
if (!FreshRSS_Context::userConf()->image_proxy_scheme_include) {
$url = substr($url, 7); // http://
}
} elseif ($scheme === 'https') {
if (!FreshRSS_Context::userConf()->image_proxy_scheme_https) {
return $url;
}
if (!FreshRSS_Context::userConf()->image_proxy_scheme_include) {
$url = substr($url, 8); // https://
}
} elseif (empty($scheme)) {
if (FreshRSS_Context::userConf()->image_proxy_scheme_default === 'auto') {
if (FreshRSS_Context::userConf()->image_proxy_scheme_include) {
$url = ((!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') ? 'https:' : 'http:') . $url;
}
} elseif (substr(FreshRSS_Context::userConf()->image_proxy_scheme_default, 0, 4) === 'http') {
if (FreshRSS_Context::userConf()->image_proxy_scheme_include) {
$url = FreshRSS_Context::userConf()->image_proxy_scheme_default . ':' . $url;
}
} else { // do not proxy unschemed ("//path/...") URLs
return $url;
}
} else { // unknown/unsupported (non-http) scheme
return $url;
}
if (FreshRSS_Context::userConf()->image_proxy_url_encode) {
$url = rawurlencode($url);
}
return FreshRSS_Context::userConf()->image_proxy_url . $url;
}
/**
* @param array<string> $matches
*/
public static function getSrcSetUris(array $matches): string {
return str_replace($matches[1], self::getProxyImageUri($matches[1]), $matches[0]);
}
public static function swapUris(string $content): string {
if (empty($content)) {
return $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*)?))/', fn (array $matches) => self::getSrcSetUris($matches), $img->getAttribute('srcset'));
if ($newSrcSet != null) {
$img->setAttribute('srcset', $newSrcSet);
}
}
}
return $doc->saveHTML() ?: '';
}
public static function setImageProxyHook(FreshRSS_Entry $entry): FreshRSS_Entry {
$entry->_content(
self::swapUris($entry->content())
);
return $entry;
}
}