OS X Server: Allowing custom URL protocols in links via wiki service

By default, links in a wiki page that use common URL protocols such as http, ftp, and so forth are already clickable.

If you wish to create links containing a custom protocol, such as irc or scp, follow the directions below.

1. Create whitelist_file per the version of OS X Server you're using.
   On Lion Server, whitelist_file refers to /etc/collabd/filter_whitelist.plist.
   On OS X Server (Mountain Lion), whitelist_file refers to /Library/Server/Wiki/Config/whitelist.plist.
    
2. Use the guidelines in How to edit configuration files to add this content to the file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>protocols</key>
	<array>
		<string>irc</string>
		<string>scp</string>
	</array>
</dict>
</plist>

3. Verify that the file's syntax is correct. An easy way to do so is by using the plutil(1) command:

plutil whitelist_file

4. Ensure that the permissions on the file are such that it will be accessible to the wiki service:

sudo chown _teamsserver:_teamsserver whitelist_file
sudo chmod 644 whitelist_file