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Support duplicated SignedMessages in Cdm.set_service_certificate

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Fixes #41

Seems some services like TF1 (France) returns a SignedMessage twice in one response body by mistake, resulting in a partial parse decoding error as pywidevine doesn't expect the parsed-then-serialized data to differ from the received data.

This workaround checks if the parsed-then-serialized data is in the received data multiple times without any leftover data. If there's no leftover data it considers it safe to continue.
This commit is contained in:
rlaphoenix 2023-12-06 15:36:27 +00:00
parent 17cefbf1d8
commit a04e751aa1
1 changed files with 8 additions and 1 deletions
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9
pywidevine/cdm.py
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@ -222,7 +222,14 @@ class Cdm:
try:
signed_message.ParseFromString(certificate)
if signed_message.SerializeToString() == certificate:
if (
signed_message.SerializeToString() == certificate or
# See https://github.com/devine-dl/pywidevine/issues/41
all(
bytes(chunk) == signed_message.SerializeToString()
for chunk in zip(*[iter(certificate)] * len(signed_message.SerializeToString()))
)
):
signed_drm_certificate.ParseFromString(signed_message.msg)
else:
signed_drm_certificate.ParseFromString(certificate)