[Bug] File observables with special character in name can not be downloaded

[KaanSK]

Work Environment

Question	Answer
OS version (server)	Ubuntu docker base image
OS version (client)	All ...
TheHive version / git hash	4.0.5
Package Type	DEB
Browser type & version	All

Problem Description

File observables with special characters in filenames can not be downloaded. "Invalid filename" error is shown. File can be found in server filesystem.

Steps to Reproduce

1. Create a file observable with example name: "Re: Re: malicious mail.eml"
2. Try to download zipped file from TheHive UI
3. Observe the error

Possible Solutions

1. Filenaming logic (mapping filename to file) may be investigated
2. Validations could be added on frontend and backend
3. Special chars and whitespace could be stripped

[To-om]

Some characters are prohibited