Check if invalid filepath specified then raise Exception

[keigohtr]

What is this PR for?

The current process allows to save files to the system file location when user specify the relative path via API. This PR checks the filename includes filepath or not.

This PR includes

• Add filename checker
• Add unittest

What type of PR is it?

Bugfix

What is the issue?

#16

How should this be tested?

client = DruckerDashClient(logger=logger, host=host)
response = client.run_upload("../../../../../../../tmp/NEW_FILE", bytes('uploaded!!!!\n', 'utf-8'))
print(response)

[yuki-mt]

LGTM.

(As for readability, method name is_valid_upload_filename or something might be better than check_... because it explicitly describes return True is the file name is valid . very trivial, though)

[keigohtr]

@yuki-mt Thank you for the review.
I agree with you. I have updated, could you check it again?

[codecov-io]

Codecov Report

Merging #17 into master will increase coverage by 0.69%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   85.87%   86.57%   +0.69%     
==========================================
  Files          16       16              
  Lines         885      931      +46     
==========================================
+ Hits          760      806      +46     
  Misses        125      125

Impacted Files	Coverage Δ
drucker/drucker_dashboard_servicer.py	98.92% <100%> (+0.14%)	⬆️
drucker/test/test_dashboard_servicer.py	100% <100%> (ø)	⬆️

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[yuki-mt]

LGTM