Extension Manager: set a larger timeout

When loading large plugins, like the dw2pdf plugin, a timout of 25
seconds may not be enough on slow connections. This increases the limit
to 5 second short of 4 minutes.

On CLI this should not be an issue at all, on web SAPIs we need to
increase the execution time first, only if that succeeds (might be
disabled on some hosts) the limit is increased.

This replaces PR dokuwiki#4377

Author: splitbrain

lib/plugins/extension/Installer.php

@@ -288,10 +288,17 @@ public function downloadArchive($url)
         // download
         $http = new DokuHTTPClient();
         $http->max_bodysize = 0;
-        $http->timeout = 25; //max. 25 sec
         $http->keep_alive = false; // we do single ops here, no need for keep-alive
         $http->agent = 'DokuWiki HTTP Client (Extension Manager)';
 
+        // large downloads may take a while on slow connections, so we try to extend the timeout to 4 minutes
+        // 4 minutes was chosen, because HTTP servers and proxies often have a 5 minute timeout
+        if (php_sapi_name() === 'cli' || @set_time_limit(60 * 4)) {
+            $http->timeout = 60 * 4 - 5; // nearly 4 minutes
+        } else {
+            $http->timeout = 25; // max. 25 sec (a bit less than default execution time)
+        }
+
         $data = $http->get($url);
         if ($data === false) throw new Exception('error_download', [$url, $http->error, $http->status]);