We are running on Jira 4.4. I need to know what is the allowable maximum file attachment size in Jira that wont impact the performance.
Also attachments of type jpeg,bitmap and png is allowed ; how to customize and restrict from users uploading file attachment to a jira issue to only jpeg and png?
I don't think there's much of a maximum size internally. There are two performance impacts to uploading large files
To prevent uploads of the "wrong" file type is more problematic. You'll need to amend the core of Jira so that it checks the type of file by reading it's header and throws back an error to block incorrect types. I've used a number of systems that try to be "clever" and stop people uploading files by checking the file extension alone, which is utterly useless because people simply change it, and it's become an even worse idea as most software now reads the headers anyway. So a bitmap saved as .jpg is opened, read and displayed fine, because the extension is irrelevant.
I'd suggest the most simple solution is to set a relatively low attachment size on your system, and then people trying to upload uncompressed images will simply find them to be too large.
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