You can use Apex to customize the behavior of files upon attempted download. These
examples assume that only one file is being downloaded. File download customization is
available in API version 39.0 and later.
Example
This example demonstrates a system that requires downloads to go through IRM
control for some users. For a Modify All Data (MAD) user who’s allowed to download
files, and whose user ID is
005xx:
To
refer to a MAD user profile, you can use UserInfo.getProfileId() instead of UserInfo.getUserId().
In this example, IRMControl is a Visualforce page created for
displaying a link to download a file from the IRM system. You need a controller for
this page that calls your IRM system. As it’s processing the file, it gives an
endpoint to download the file when it’s controlled. Your IRM system uses the sObject
API to get the VersionData of this ContentVersion. Therefore, the IRM system needs
the VersionID and must retrieve the VersionData using the MAD user.
Your IRM
system is at http://irmsystem and is expecting the VersionID as
a query parameter. The IRM system returns a JSON response with the download endpoint
in a downloadEndpoint
value.
Example
The following example creates a class that implements the
ContentDownloadHandlerFactory interface and returns
a download handler that prevents downloading a file to a mobile
device.
Example
You can also prevent downloading a file from a mobile device and require that a
file must go through IRM
control.
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