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Use std-lib xml instead of lxml (#35) 

Allows for support on ARM devices and reduces dependencies.

---------

Co-authored-by: rlaphoenix <rlaphoenix@pm.me>
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mediaminister 2023-10-17 21:40:47 +02:00 committed by GitHub
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commit c71f867a72
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4 changed files with 29 additions and 162 deletions
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@ -1,10 +1,9 @@
# This file is automatically @generated by Poetry 1.4.1 and should not be changed by hand. # This file is automatically @generated by Poetry 1.6.1 and should not be changed by hand.
[[package]] [[package]]
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@ -115,7 +114,6 @@ speedups = ["Brotli", "aiodns", "cchardet"]
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@ -130,7 +128,6 @@ frozenlist = ">=1.1.0"
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@ -145,7 +142,6 @@ typing-extensions = {version = ">=3.6.5", markers = "python_version < \"3.8\""}
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@ -157,7 +153,6 @@ files = [
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@ -179,7 +174,6 @@ tests-no-zope = ["cloudpickle", "hypothesis", "mypy (>=1.1.1)", "pympler", "pyte
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@ -276,7 +269,6 @@ files = [
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@ -399,7 +388,6 @@ files = [
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{file = "PyYAML-6.0.1-cp39-cp39-win_amd64.whl", hash = "sha256:510c9deebc5c0225e8c96813043e62b680ba2f9c50a08d3724c7f28a747d1486"}, {file = "PyYAML-6.0.1-cp39-cp39-win_amd64.whl", hash = "sha256:510c9deebc5c0225e8c96813043e62b680ba2f9c50a08d3724c7f28a747d1486"},
{file = "PyYAML-6.0.1.tar.gz", hash = "sha256:bfdf460b1736c775f2ba9f6a92bca30bc2095067b8a9d77876d1fad6cc3b4a43"}, {file = "PyYAML-6.0.1.tar.gz", hash = "sha256:bfdf460b1736c775f2ba9f6a92bca30bc2095067b8a9d77876d1fad6cc3b4a43"},
@ -752,7 +638,6 @@ files = [
name = "requests" name = "requests"
version = "2.31.0" version = "2.31.0"
description = "Python HTTP for Humans." description = "Python HTTP for Humans."
category = "main"
optional = false optional = false
python-versions = ">=3.7" python-versions = ">=3.7"
files = [ files = [
@ -774,7 +659,6 @@ use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
name = "typing-extensions" name = "typing-extensions"
version = "4.7.1" version = "4.7.1"
description = "Backported and Experimental Type Hints for Python 3.7+" description = "Backported and Experimental Type Hints for Python 3.7+"
category = "main"
optional = false optional = false
python-versions = ">=3.7" python-versions = ">=3.7"
files = [ files = [
@ -786,7 +670,6 @@ files = [
name = "unidecode" name = "unidecode"
version = "1.3.6" version = "1.3.6"
description = "ASCII transliterations of Unicode text" description = "ASCII transliterations of Unicode text"
category = "main"
optional = false optional = false
python-versions = ">=3.5" python-versions = ">=3.5"
files = [ files = [
@ -798,7 +681,6 @@ files = [
name = "urllib3" name = "urllib3"
version = "2.0.4" version = "2.0.4"
description = "HTTP library with thread-safe connection pooling, file post, and more." description = "HTTP library with thread-safe connection pooling, file post, and more."
category = "main"
optional = false optional = false
python-versions = ">=3.7" python-versions = ">=3.7"
files = [ files = [
@ -816,7 +698,6 @@ zstd = ["zstandard (>=0.18.0)"]
name = "yarl" name = "yarl"
version = "1.9.2" version = "1.9.2"
description = "Yet another URL library" description = "Yet another URL library"
category = "main"
optional = true optional = true
python-versions = ">=3.7" python-versions = ">=3.7"
files = [ files = [
@ -905,7 +786,6 @@ typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
name = "zipp" name = "zipp"
version = "3.15.0" version = "3.15.0"
description = "Backport of pathlib-compatible object wrapper for zip files" description = "Backport of pathlib-compatible object wrapper for zip files"
category = "main"
optional = false optional = false
python-versions = ">=3.7" python-versions = ">=3.7"
files = [ files = [
@ -923,4 +803,4 @@ serve = ["PyYAML", "aiohttp"]
[metadata] [metadata]
lock-version = "2.0" lock-version = "2.0"
python-versions = ">=3.7,<3.12" python-versions = ">=3.7,<3.12"
content-hash = "8522ea9bcabac4ceacd17b29816f1185ad753dec6720a4924002af950f6f596e" content-hash = "6ffa18d45b263f74f743670f06d8fc09c0f9dbcab22a335cd6f4eac34cfd9bca"

1
pyproject.toml
View File

@ -33,7 +33,6 @@ pymp4 = "^1.4.0"
pycryptodome = "^3.19.0" pycryptodome = "^3.19.0"
click = "^8.1.7" click = "^8.1.7"
requests = "^2.31.0" requests = "^2.31.0"
lxml = ">=4.9.3"
Unidecode = "^1.3.6" Unidecode = "^1.3.6"
PyYAML = "^6.0.1" PyYAML = "^6.0.1"
aiohttp = {version = "^3.8.5", optional = true} aiohttp = {version = "^3.8.5", optional = true}

23
pywidevine/pssh.py
View File

@ -6,6 +6,7 @@ import string
from io import BytesIO from io import BytesIO
from typing import Optional, Union from typing import Optional, Union
from uuid import UUID from uuid import UUID
from xml.etree.ElementTree import XML
import construct import construct
from construct import Container from construct import Container
@ -13,7 +14,6 @@ from google.protobuf.message import DecodeError
from pymp4.parser import Box from pymp4.parser import Box
from pywidevine.license_protocol_pb2 import WidevinePsshData from pywidevine.license_protocol_pb2 import WidevinePsshData
from pywidevine.utils import load_xml
class PSSH: class PSSH:
@ -266,19 +266,30 @@ class PSSH:
# TODO: Add support for Embedded License Stores (0x03) # TODO: Add support for Embedded License Stores (0x03)
continue continue
prr_header = load_xml(prr_value.decode("utf-16-le")) wrm_ns = {"wrm": "http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader"}
prr_header_version = prr_header.attrib["version"] prr_header = XML(prr_value.decode("utf-16-le"))
prr_header_version = prr_header.get("version")
if prr_header_version == "4.0.0.0": if prr_header_version == "4.0.0.0":
key_ids = prr_header.xpath("DATA/KID/text()") key_ids = [
x.text
for x in prr_header.findall("./wrm:DATA/wrm:KID", wrm_ns)
]
elif prr_header_version == "4.1.0.0": elif prr_header_version == "4.1.0.0":
key_ids = prr_header.xpath("DATA/PROTECTINFO/KID/@VALUE") key_ids = [
x.get("VALUE")
for x in prr_header.findall("./wrm:DATA/wrm:PROTECTINFO/wrm:KID", wrm_ns)
]
elif prr_header_version in ("4.2.0.0", "4.3.0.0"): elif prr_header_version in ("4.2.0.0", "4.3.0.0"):
# TODO: Retain the Encryption Scheme information in v4.3.0.0 # TODO: Retain the Encryption Scheme information in v4.3.0.0
# This is because some Key IDs can be AES-CTR while some are AES-CBC. # This is because some Key IDs can be AES-CTR while some are AES-CBC.
# Conversion to WidevineCencHeader could use this information. # Conversion to WidevineCencHeader could use this information.
key_ids = prr_header.xpath("DATA/PROTECTINFO/KIDS/KID/@VALUE") key_ids = [
x.get("VALUE")
for x in prr_header.findall("./wrm:DATA/wrm:PROTECTINFO/wrm:KIDS/wrm:KID", wrm_ns)
]
else: else:
raise ValueError(f"Unsupported PlayReadyHeader version {prr_header_version}") raise ValueError(f"Unsupported PlayReadyHeader version {prr_header_version}")
return [ return [
UUID(bytes=base64.b64decode(key_id)) UUID(bytes=base64.b64decode(key_id))
for key_id in key_ids for key_id in key_ids

23
pywidevine/utils.py
View File

@ -2,9 +2,6 @@ import shutil
from pathlib import Path from pathlib import Path
from typing import Optional, Union from typing import Optional, Union
from lxml import etree
from lxml.etree import ElementTree
def get_binary_path(*names: str) -> Optional[Path]: def get_binary_path(*names: str) -> Optional[Path]:
"""Get the path of the first found binary name.""" """Get the path of the first found binary name."""
@ -13,23 +10,3 @@ def get_binary_path(*names: str) -> Optional[Path]:
if path: if path:
return Path(path) return Path(path)
return None return None
def load_xml(xml: Union[str, bytes]) -> ElementTree:
"""Parse XML data to an ElementTree, without namespaces anywhere."""
if not isinstance(xml, bytes):
xml = xml.encode("utf8")
root = etree.fromstring(xml)
for elem in root.getiterator():
if not hasattr(elem.tag, "find"):
# e.g. comment elements
continue
elem.tag = etree.QName(elem).localname
for name, value in elem.attrib.items():
local_name = etree.QName(name).localname
if local_name == name:
continue
del elem.attrib[name]
elem.attrib[local_name] = value
etree.cleanup_namespaces(root)
return root