Fix detach&attach not to create new COSEMessage instance

[kentakayama]

No description provided.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (753d090) 97.24% compared to head (659da4b) 97.24%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #447   +/-   ##
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  Coverage   97.24%   97.24%           
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  Files          32       32           
  Lines        3261     3262    +1     
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+ Hits         3171     3172    +1     
  Misses         90       90           

Files	Coverage Δ
cwt/cose_message.py	96.17% <100.00%> (+0.01%)	⬆️

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[kentakayama]

I noticed that dumps() method includes the payload even after detach_payload() is done.
Let me give some time to fix it.

[kentakayama]

@dajiaji
Thank you for your review, now it works.
I have to note that

COSEMessage.loads() on detached content message works fine

This code below prints like this, and it outputs what I expected.

18([<< {1: -7, 3: 0} >>, {4: << -18, -18 >>}, null, h'6520BBAF2081D7E0ED0F95F76EB0733D667005F7467CEC4B87B9381A6BA1EDE8E00DF29F32A37230F39A842A54821FDD223092819D7728EFB9D3A0080B75380B'])

import sys
import subprocess
from cwt import COSEMessage
"""
18([
  / protected: / h'A201260300',
  / unprotected: / {4: h'3131'},
  / payload: / null / detached /,
  / signature: / h'6520BBAF2081D7E0ED0F95F76EB0733D667005F7467CEC4B87B9381A6BA1EDE8E00DF29F32A37230F39A842A54821FDD223092819D7728EFB9D3A0080B75380B'
])
"""
expected_detached_cose_message = COSEMessage.loads(
    bytes.fromhex(
        "D28445A201260300A104423131F658406520BBAF2081D7E0ED0F95F76EB0733D667005F7467CEC4B87B9381A6BA1EDE8E00DF29F32A37230F39A842A54821FDD223092819D7728EFB9D3A0080B75380B"
    )
)
output = subprocess.check_output(f"echo {expected_detached_cose_message.dumps().hex().upper()} | pretty2diag.rb -e", shell=True).decode(sys.stdout.encoding).rstrip("\n")
print(output)

on the other hand,

I expect that countersign on this instance would produce we don't expect

because both self._payload and self._msg[2] is None .
Could you fix it in the future?

[dajiaji]

Could you fix it in the future?

Yes, I understand this negative side-effect. I can fix it on my next PR.