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Access uploaded file in Groovy Script

jvaidya

I'm trying to Base64 encode a file that a user uploads in an Activiti form, and then save the resulting encoding as a string to be accessed by other parts of the business process. I thought a Groovy Script in a Script task would be the best way to do this. How do I access the file in the script?

Would something like:

execution.getVariable('file');

give me access to the raw file?

Thanks!

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Alfresco Process Services

Accepted answers

jvaidya

Managed to solve this issue! We had to change the activiti-app.properties configuration file to set:

# Beans whitelisting
beans.whitelisting.enabled=false

# EL whitelisting
el.whitelisting.enabled=false

All comments

gdharley

Nope, When you upload a file it is registered as related content (Enterprise Edition) or as an attachment (Community Edition).

You will need to use the relatedContentService to retrieve the uploaded files for the process instance (Enterprise Edition).
More details here:

if using Community Edition you can get to the attachments you use taskService.getTaskAttachments(taskid).

This will return a list of atachments from which you can retrieve the content.

Greg

‌

jvaidya

Thanks Greg! Very helpful! I tried calling the API from a Script Task, but I can't use jQuery or vanilla JavaScript AJAX calls. The error I get from Activiti is:

Caused by: <eval>:5 ReferenceError: "XMLHttpRequest" is not defined

How do I access this API if I can't use XML Http Requests?

EDIT: I tried following this : What is the best way to call REST API from Activiti? Can I use JavaScript's URL redirection? but I get an "'importPackage' is not defined" error.

gdharley

Hi Jay,

Script tasks actually run on the server side, even though they use Javascript (via embedded Nashorn/Rhino engine) or groovy.

Therefore you dont need to access the Ajax request.

Look up script tasks here: Activiti User Guide - Script Task

jvaidya

How do I access the file using relatedContentService? The link you pointed me to in the original answer uses REST API calls, so I got a little confused! Sorry about that.

Can you point me to the documentation for relatedContentService?