This is a Limesurvey plugin. Using this piece of software, you can convert HTML links into plain text URLs, inside the body of messages sent by Limesurvey Surveys Administrators.
There is no interface or configuration, it acts silently when mails are sent, replacing all links with textual rapresentations.
This Limesurvey plugin leverages Yii framework using CHTMLPurifier class. That library is configured for securing non-ascii codes and converting href HTML attributes into plain texts URLs.
For additional security, in second instance we run a custom crafted functionality based on PHP DOM Extension.
When the survey is configured for sending plain-text mails instead of HTML, the plugin simply skips running.
Just checkout this repository inside the plugins directory of your Limesurvey installation, or just download it as a zip file, then extract in the same place.
Then login into your Limesurvey administration panel and visit "Plugin Configuration" page to enable.
More informations on changelog