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fix: decode_session_id: detect compression #561

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Merged
faretek1 merged 3 commits into from
Jan 23, 2026
Merged

fix: decode_session_id: detect compression #561

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d9b48b6
fix: decode_session_id: detect compression
faretek1 Jan 23, 2026
5f52d9d
fix: incorrect zlib check
faretek1 Jan 23, 2026
1c6b6b8
fix: cat ear detection
faretek1 Jan 23, 2026
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9 changes: 6 additions & 3 deletions scratchattach/site/session.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1133,7 +1133,7 @@ def decode_session_id(session_id: str) -> tuple[dict[str, str], datetime.datetim
Session id is in the format:
<p1: long base64 string>:<p2: short base64 string>:<p3: medium base64 string>

p1 contains a base64-zlib compressed JSON string
p1 contains a base64 JSON string (if it starts with `.`, then it is zlib compressed)
p2 is a base 62 encoded timestamp
p3 might be a `synchronous signature` for the first 2 parts (might be useless for us)

Expand All @@ -1148,10 +1148,13 @@ def decode_session_id(session_id: str) -> tuple[dict[str, str], datetime.datetim
- django_timezone
- _auth_user_hash
"""
p1, p2, p3 = session_id.split(':')
p1, p2, _ = session_id.split(':')
p1_bytes = base64.urlsafe_b64decode(p1 + "==")
if p1.startswith('".'):
p1_bytes = zlib.decompress(p1_bytes)

return (
json.loads(zlib.decompress(base64.urlsafe_b64decode(p1 + "=="))),
json.loads(p1_bytes),
datetime.datetime.fromtimestamp(commons.b62_decode(p2))
)

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