97 lines
2.7 KiB
PHP
97 lines
2.7 KiB
PHP
<?php
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/**
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* Class: Update
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* Informs the user if a newer version of Chyrp Lite is available.
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*/
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class Update {
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/**
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* Function: check
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* Checks the update channel.
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*/
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public static function check(): void {
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$config = Config::current();
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$visitor = Visitor::current();
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if (!$config->check_updates)
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return;
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if (!$visitor->group->can("change_settings"))
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return;
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# Return unless elapsed time is greater than the update interval.
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if (!((time() - $config->check_updates_last) > UPDATE_INTERVAL))
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return;
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$config->set("check_updates_last", time());
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$rss = get_remote(UPDATE_XML, 3);
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if ($rss === false) {
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self::warning();
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return;
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}
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$xml = @simplexml_load_string($rss);
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if (!self::validate($xml)) {
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self::warning();
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return;
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}
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foreach ($xml->channel->item as $item)
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if (version_compare(CHYRP_VERSION, $item->guid, "<")) {
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self::message($item);
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return;
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}
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}
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/**
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* Function: validate
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* Validates the XML dataset.
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*/
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private static function validate($xml): bool {
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if (!$xml instanceof SimpleXMLElement)
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return false;
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if (!isset($xml->channel->item))
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return false;
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foreach ($xml->channel->item as $item)
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if (
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!isset($item->guid) or
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!isset($item->title) or
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!isset($item->link)
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)
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return false;
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if (!is_url($item->link))
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return false;
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return true;
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}
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/**
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* Function: message
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* Flash the user about the newer version.
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*/
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private static function message($item): void {
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Flash::message(
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_f("Chyrp Lite “%s” is available.", fix($item->title)).
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' <a href="'.fix($item->link, true).'" target="_blank">'.
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__("Go to GitHub!").'</a>'
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);
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}
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/**
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* Function: warning
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* Flash the user about the failed check.
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*/
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private static function warning(): void {
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Flash::warning(
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__("Unable to check for new Chyrp Lite versions.").
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' <a href="'.fix(UPDATE_PAGE, true).'" target="_blank">'.
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__("Go to GitHub!").'</a>'
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);
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}
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}
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