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<?php
class Af_Zz_ImgProxy extends Plugin {
private $host;
function about() {
return array(1.0,
"Load insecure images via built-in proxy",
"fox");
}
function init($host) {
$this->host = $host;
$host->add_hook($host::HOOK_RENDER_ARTICLE, $this);
$host->add_hook($host::HOOK_RENDER_ARTICLE_CDM, $this);
$host->add_hook($host::HOOK_RENDER_ARTICLE_API, $this);
$host->add_hook($host::HOOK_PREFS_TAB, $this);
}
function hook_render_article($article) {
return $this->hook_render_article_cdm($article);
}
function hook_render_article_api($headline) {
return $this->hook_render_article_cdm($headline["headline"], true);
}
public function imgproxy() {
$url = rewrite_relative_url(SELF_URL_PATH, $_REQUEST["url"]);
$kind = (int) $_REQUEST["kind"]; // 1 = video
$extension = $kind == 1 ? '.mp4' : '.png';
$local_filename = CACHE_DIR . "/images/" . sha1($url) . $extension;
//if ($_REQUEST["debug"] == "1") { print $local_filename; die; }
header("Content-Disposition: inline; filename=\"".basename($local_filename)."\"");
if (file_exists($local_filename)) {
$mimetype = mime_content_type($local_filename);
header("Content-type: $mimetype");
$stamp = gmdate("D, d M Y H:i:s", filemtime($local_filename)). " GMT";
header("Last-Modified: $stamp", true);
readfile($local_filename);
} else {
$data = fetch_file_contents(array("url" => $url));
if ($data) {
if (file_put_contents($local_filename, $data)) {
$mimetype = mime_content_type($local_filename);
header("Content-type: $mimetype");
}
print $data;
}
}
}
function rewrite_url_if_needed($url, $kind, $all_remote = false) {
$scheme = parse_url($url, PHP_URL_SCHEME);
if ($all_remote) {
$host = parse_url($url, PHP_URL_HOST);
$self_host = parse_url(SELF_URL_PATH, PHP_URL_HOST);
$is_remote = $host != $self_host;
} else {
$is_remote = false;
}
if (($scheme != 'https' && $scheme != "") || $is_remote) {
if (strpos($url, "data:") !== 0) {
$url = "backend.php?op=pluginhandler&plugin=af_zz_imgproxy&method=imgproxy&kind=$kind&url=" .
htmlspecialchars($url);
}
}
return $url;
}
function hook_render_article_cdm($article, $api_mode = false) {
$need_saving = false;
$proxy_all = $this->host->get($this, "proxy_all");
$doc = new DOMDocument();
if (@$doc->loadHTML($article["content"])) {
$xpath = new DOMXPath($doc);
$imgs = $xpath->query("//img[@src]");
foreach ($imgs as $img) {
$new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), 0, $proxy_all);
if ($new_src != $img->getAttribute("src")) {
$img->setAttribute("src", $new_src);
$need_saving = true;
}
}
$vids = $xpath->query("//video");
foreach ($vids as $vid) {
if ($vid->hasAttribute("poster")) {
$new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), 0, $proxy_all);
if ($new_src != $vid->getAttribute("poster")) {
$vid->setAttribute("poster", $new_src);
$need_saving = true;
}
}
$vsrcs = $xpath->query("source", $vid);
foreach ($vsrcs as $vsrc) {
$new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), 1, $proxy_all);
if ($new_src != $vsrc->getAttribute("src")) {
$vid->setAttribute("src", $new_src);
$need_saving = true;
}
}
}
}
if ($need_saving) $article["content"] = $doc->saveXML();
return $article;
}
function hook_prefs_tab($args) {
if ($args != "prefFeeds") return;
print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('af_zz_imgproxy Settings')."\">";
print "<form dojoType=\"dijit.form.Form\">";
print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
evt.preventDefault();
if (this.validate()) {
console.log(dojo.objectToQuery(this.getValues()));
new Ajax.Request('backend.php', {
parameters: dojo.objectToQuery(this.getValues()),
onComplete: function(transport) {
notify_info(transport.responseText);
}
});
//this.reset();
}
</script>";
print_hidden("op", "pluginhandler");
print_hidden("method", "save");
print_hidden("plugin", "af_zz_imgproxy");
$proxy_all = $this->host->get($this, "proxy_all");
print_checkbox("proxy_all", $proxy_all);
print " <label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label>";
print "<p>"; print_button("submit", __("Save"));
print "</form>";
print "</div>";
}
function save() {
$proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]) == "true";
$this->host->set($this, "proxy_all", $proxy_all);
echo __("Configuration saved");
}
function api_version() {
return 2;
}
}
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