| File Pre- and Post-Processing (Prepost) | 90
• as_dbg2
• as_dbg3
• as_dbg4
To use the ascp log functions in your Lua script, replace as with lua.
Miscellaneous Lua Interfaces
•
lua_override_ear_secret("secret")
Override the server-side encryption-at-rest (EAR) secret that is set in aspera.conf with the specified secret.
File Pre- and Post-Processing (Prepost)
HST Server can run file processing scripts that run before or after a transfer session or file transfer.
Setting Up Pre/Post Processing
HST Server can be configured to run scripts that are triggered by session start, session stop, file start, and file stop.
Important: The "File Pre- and Post-Processing (Prepost)" feature is deprecated and will be removed from HST
Server and HST Endpoint for versions 4.0 and onward. Customers should use Inline File validation with Lua (Inline
File Validation with Lua Script on page 87) or an External URL validator (Out-of-Transfer File Validation on
page 80) for pre-post processing features.
Your Aspera server can automatically execute a shell script from a pre-defined location:
/opt/aspera/var/
The script is executed as a result of four transfer events:
• Session start
• Session end
• Start of each individual file transfer in the session
• End of each individual file transfer in the session
The aspera-prepost script can also execute additional shell scripts, Perl scripts, native executables, and Java
programs.
Environment Variables: Aspera has several environment variables for aspera-prepost that you can use in
your own custom scripts. These environment variables are described in detail in Pre/Post Variables on page 91.
Depending on usage, pre- and post-processing may consume a large amount of system resources. Be sure to evaluate
your system performance and apply this feature appropriately.
CAUTION: When creating pre- and post-processing scripts, unsafe scripts can compromise a server. As with
CGI scripts, you should take precautions in testing a pre/post script before placing it into use (such as taint
checking and ensuring proper quotes). You should also be aware of user permissions; pre/post scripts run as
the user who authenticates the transfer. To prevent a pre/post script from performing an action with elevated
or special user permissions, the script needs to check the $USER variable.
To set up pre/post processing for your Aspera transfer product:
1.
Set up the shell script file.
Locate the following file:
/opt/aspera/var/aspera-prepost.disable
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