164 lines
4.7 KiB
PHP
164 lines
4.7 KiB
PHP
<?php
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class Cacher extends Modules {
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private $lastmod = 0;
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private $excluded = false;
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private $modified = false;
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public function __init(): void {
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$config = Config::current();
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$this->lastmod = $config->module_cacher["cache_lastmod"];
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$this->prepare_cache_triggers();
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$this->setPriority("route_init", 5);
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$this->setPriority("route_done", 5);
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}
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public static function __install(): void {
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Config::current()->set(
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"module_cacher",
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array("cache_lastmod" => time())
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);
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}
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public static function __uninstall(): void {
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Config::current()->remove("module_cacher");
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}
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public function route_init($route): void {
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if (!$this->eligible())
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return;
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if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
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$lastmod = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
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if ($lastmod >= $this->lastmod) {
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header_remove();
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header($_SERVER['SERVER_PROTOCOL']." 304 Not Modified");
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header("Cache-Control: no-cache, private");
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header("Pragma: no-cache");
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header("Expires: ".date("r", now("+30 days")));
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header("Vary: Accept-Encoding, Cookie, Save-Data");
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exit;
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}
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}
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}
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public function route_done($route): void {
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# Prevent erroneous redirections.
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unset($_SESSION['redirect_to']);
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unset($_SESSION['post_redirect']);
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unset($_SESSION['page_redirect']);
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if (!$this->eligible())
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return;
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if (!$route->success)
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return;
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if (!headers_sent()) {
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header("Last-Modified: ".date("r", $this->lastmod));
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header("Cache-Control: no-cache, private");
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header("Pragma: no-cache");
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header("Expires: ".date("r", now("+30 days")));
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header("X-Chyrp-Cacher-Hint: ".$this->generate_hint());
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}
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}
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private function eligible(): bool {
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if (PREVIEWING)
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return false;
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if (!empty($_POST))
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return false;
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if (Flash::exists())
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return false;
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if ($this->excluded)
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return false;
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return true;
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}
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private function generate_hint(): string {
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$items = array(
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Visitor::current()->group->id,
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get_class(Route::current()->controller)
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);
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return token($items);
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}
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private function prepare_cache_triggers(): void {
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$trigger = Trigger::current();
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$regenerate = array(
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"add_post",
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"add_page",
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"update_post",
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"update_page",
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"update_user",
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"update_group",
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"delete_post",
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"delete_page",
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"delete_user",
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"delete_upload",
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"publish_post",
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"import",
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"user_logged_in",
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"user_logged_out",
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"change_setting",
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# Categorize module:
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"add_category",
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"update_category",
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"delete_category",
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# Comments module:
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"add_comment",
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"update_comment",
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"delete_comment",
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# Likes module:
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"add_like",
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"delete_like",
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# Pingable module:
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"add_pingback",
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"update_pingback",
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"delete_pingback"
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);
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$trigger->filter($regenerate, "cache_regenerate_triggers");
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foreach ($regenerate as $action)
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$this->addAlias($action, "cache_regenerate");
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$exclude = array(
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"user_login",
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"before_generate_captcha"
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);
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$trigger->filter($exclude, "cache_exclude_triggers");
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foreach ($exclude as $action)
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$this->addAlias($action, "cache_exclude");
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}
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public function cache_regenerate(): void {
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if ($this->modified)
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return;
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$this->modified = true;
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$config = Config::current();
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$settings = $config->module_cacher;
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$settings["cache_lastmod"] = time();
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$config->set("module_cacher", $settings);
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}
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public function cache_exclude(): void {
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$this->excluded = true;
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}
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}
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