AEM 6.5.19 On-Prem Restrict DAM Upload Size (not by mime type)

Hi @this-that-the-otter 

We have done it for one of the client but can not share more details of it 

To limit the size of individual files being uploaded to the AEM DAM, you can create a custom workflow model that includes a process step to validate the size of the asset. Here's a high-level overview of how you can do this:

1. Create a custom workflow model: In AEM, navigate to Tools -> Workflow -> Models. Click on "Create", give your workflow a title and name, and then click on "Done".

2. Add a process step to the workflow: Drag and drop a "Process Step" from the side panel onto the workflow model. This step will contain the custom code that validates the size of the asset.

3. Create a custom workflow process step: This is a Java class that implements the WorkflowProcess interface. In the execute method of this class, you can access the asset, check its size, and if it exceeds the limit, terminate the workflow with an error message.

Here is a example 

@Override
public void execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap args) throws WorkflowException {
Asset asset = workflowSession.getSession().getAsset(workItem.getWorkflowData().getPayload().toString());

if (asset != null) {
long size = asset.getOriginal().getSize();
long maxSize = 10485760; // 10MB

if (size > maxSize) {
throw new WorkflowException("File size exceeds the limit of 10MB");
}
}
}

4. Configure the process step in the workflow model: In the workflow model, click on the process step to configure it. In the "Process" field, select your custom workflow process step.

5. Apply the workflow model to DAM Update Asset workflow: In the DAM Update Asset workflow, replace the existing process step with your new workflow model.

 this is a high-level overview and the actual implementation may vary based on your specific requirements and AEM setup.