Implement session cognito token expiry

[jpl-btlunsfo]

Purpose

• Implements the cognito token expiration checking

Proposed Changes

• CHANGE cognito token fetching to store expiry date
• CHANGE _is_expired method to actually validate something

Issues

• none

Testing

• Tested with:

process_service = unity.client(UnityServices.PROCESS_SERVICE)
process_service.endpoint = "https://api.dev.mdps.mcp.nasa.gov/unity/dev/ogc/api"

processes = process_service.get_processes()
print(process_service._session.get_auth()._token)
print(process_service._session.get_auth()._token_expiration)

for process in processes:
    print("Process ID: {}\n".format(process.id))

time.sleep(3601)

print("retrying with same client")

processes = process_service.get_processes()
print(process_service._session.get_auth()._token)
print(process_service._session.get_auth()._token_expiration)

for process in processes:
    print("Process ID: {}\n".format(process.id))

Successfully showed key re-fetching.

[coveralls]

Pull Request Test Coverage Report for Build 15542829983

Details

• 16 of 23 (69.57%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.002%) to 50.887%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
libs/unity-py/unity_sds_client/unity_session.py	16	23	69.57%

Files with Coverage Reduction	New Missed Lines	%
libs/unity-py/unity_sds_client/unity_session.py	1	79.75%

Totals
Change from base Build 15125113440:	-0.002%
Covered Lines:	861
Relevant Lines:	1692

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💛 - Coveralls