core: Display optional administrator email (#896)

config.default.ini.php

@@ -11,6 +11,12 @@
 ; false = disabled (default)
 custom_timeout = false
 
+[admin]
+; Advertise an email address where people can reach the administrator.
+; This address is displayed on the main page, visible to everyone!
+; ""    = Disabled (default)
+email = ""
+
 [proxy]
 
 ; Sets the proxy url (i.e. "tcp://192.168.0.0:32")

lib/BridgeList.php

@@ -96,6 +96,18 @@ EOD;
 	private static function getFooter($totalBridges, $totalActiveBridges, $showInactive) {
 		$version = Configuration::getVersion();
 
+		$email = Configuration::getConfig('admin', 'email');
+		$admininfo = '';
+		if (!empty($email)) {
+			$admininfo = <<<EOD
+<br />
+<span>
+   You may email the administrator of this RSS-Bridge instance
+   at <a href="mailto:{$email}">{$email}</a>
+</span>
+EOD;
+		}
+
 		$inactive = '';
 
 		if($totalActiveBridges !== $totalBridges) {
@@ -114,6 +126,7 @@ EOD;
 	<p class="version">{$version}</p>
 	{$totalActiveBridges}/{$totalBridges} active bridges.<br>
 	{$inactive}
+	{$admininfo}
 </section>
 EOD;
 	}