IBX-11681: Added filename validation in DownloadController and corresponding tests#756

wiewiurdp wants to merge 2 commits into

4.6ibexa/core:4.6from

IBX-11681-Possibility-to-download-all-files-using-a-loop-which-may-cause-DDoSibexa/core:IBX-11681-Possibility-to-download-all-files-using-a-loop-which-may-cause-DDoSCopy head branch name to clipboard