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PSSH: Rework get_key_ids as key_ids property

This commit is contained in:
rlaphoenix 2022-08-06 13:44:00 +01:00
parent 1064c7953c
commit 0d13d4184b
1 changed files with 44 additions and 43 deletions
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87
pywidevine/pssh.py
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@ -182,6 +182,50 @@ class PSSH:
return pssh
@property
def key_ids(self) -> list[UUID]:
"""
Get all Key IDs from within the Box or Init Data, wherever possible.
Supports:
- Version 1 Boxes
- Widevine Headers
- PlayReady Headers (4.0.0.0->4.3.0.0)
"""
if self.version == 1 and self.__key_ids:
return self.__key_ids
if self.system_id == PSSH.SystemId.Widevine:
# TODO: What if its not a Widevine Cenc Header but the System ID is set as Widevine?
cenc_header = WidevinePsshData()
cenc_header.ParseFromString(self.init_data)
return [
# the key_ids value may or may not be hex underlying
UUID(bytes=key_id) if len(key_id) == 16 else UUID(hex=key_id.decode())
for key_id in cenc_header.key_ids
]
if self.system_id == PSSH.SystemId.PlayReady:
xml_string = self.init_data.decode("utf-16-le")
# some of these init data has garbage(?) in front of it
xml_string = xml_string[xml_string.index("<"):]
xml = etree.fromstring(xml_string)
header_version = xml.attrib["version"]
if header_version == "4.0.0.0":
key_ids = xml.xpath("DATA/KID/text()")
elif header_version == "4.1.0.0":
key_ids = xml.xpath("DATA/PROTECTINFO/KID/@VALUE")
elif header_version in ("4.2.0.0", "4.3.0.0"):
key_ids = xml.xpath("DATA/PROTECTINFO/KIDS/KID/@VALUE")
else:
raise ValueError(f"Unsupported PlayReady header version {header_version}")
return [
UUID(bytes=base64.b64decode(key_id))
for key_id in key_ids
]
raise ValueError(f"This PSSH is not supported by key_ids() property, {self.dumps()}")
@classmethod
def from_playready_pssh(cls, box: Container) -> PSSH:
"""
@ -231,49 +275,6 @@ class PSSH:
"""Export the PSSH object as a full PSSH box in base64 form."""
return base64.b64encode(self.dump()).decode()
@staticmethod
def get_key_ids(box: Container) -> list[UUID]:
"""
Get Key IDs from a PSSH Box from within the Box or Init Data where possible.
Supports:
- Version 1 Boxes
- Widevine Headers
- PlayReady Headers (4.0.0.0->4.3.0.0)
"""
if box.version == 1 and box.key_IDs:
return box.key_IDs
if box.system_ID == PSSH.SystemId.Widevine:
init = WidevinePsshData()
init.ParseFromString(box.init_data)
return [
# the key_ids value may or may not be hex underlying
UUID(bytes=key_id) if len(key_id) == 16 else UUID(hex=key_id.decode())
for key_id in init.key_ids
]
if box.system_ID == PSSH.SystemId.PlayReady:
xml_string = box.init_data.decode("utf-16-le")
# some of these init data has garbage(?) in front of it
xml_string = xml_string[xml_string.index("<"):]
xml = etree.fromstring(xml_string)
header_version = xml.attrib["version"]
if header_version == "4.0.0.0":
key_ids = xml.xpath("DATA/KID/text()")
elif header_version == "4.1.0.0":
key_ids = xml.xpath("DATA/PROTECTINFO/KID/@VALUE")
elif header_version in ("4.2.0.0", "4.3.0.0"):
key_ids = xml.xpath("DATA/PROTECTINFO/KIDS/KID/@VALUE")
else:
raise ValueError(f"Unsupported PlayReady header version {header_version}")
return [
UUID(bytes=base64.b64decode(key_id))
for key_id in key_ids
]
raise ValueError(f"Unsupported Box {box!r}")
def set_key_ids(self, key_ids: list[UUID]) -> None:
"""Overwrite all Key IDs with the specified Key IDs."""
if self.system_id != PSSH.SystemId.Widevine: