mirror of
https://github.com/l1ving/youtube-dl
synced 2024-12-31 00:02:57 +08:00
[youtube] Add support for classes in swf parser
This commit is contained in:
Philipp Hagemeister
parent
3fbd27f73e
commit
5dc3552d85
@ -507,6 +507,12 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
v = - ((v ^ 0xffffffff) + 1)
|
||||
return v
|
||||
|
||||
def s24(reader):
|
||||
bs = reader.read(3)
|
||||
assert len(bs) == 3
|
||||
first_byte = b'\xff' if (ord(bs[0:1]) >= 0x80) else b'\x00'
|
||||
return struct.unpack('!i', first_byte + bs)
|
||||
|
||||
def read_string(reader=None):
|
||||
if reader is None:
|
||||
reader = code_reader
|
||||
@ -647,16 +653,25 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
|
||||
return methods
|
||||
|
||||
class AVMClass(object):
|
||||
def __init__(self, name_idx):
|
||||
self.name_idx = name_idx
|
||||
self.method_names = {}
|
||||
self.method_idxs = {}
|
||||
self.methods = {}
|
||||
self.method_pyfunctions = {}
|
||||
self.variables = {}
|
||||
|
||||
@property
|
||||
def name(self):
|
||||
return multinames[self.name_idx]
|
||||
|
||||
# Classes
|
||||
TARGET_CLASSNAME = u'SignatureDecipher'
|
||||
searched_idx = multinames.index(TARGET_CLASSNAME)
|
||||
searched_class_id = None
|
||||
class_count = u30()
|
||||
classes = []
|
||||
for class_id in range(class_count):
|
||||
name_idx = u30()
|
||||
if name_idx == searched_idx:
|
||||
# We found the class we're looking for!
|
||||
searched_class_id = class_id
|
||||
classes.append(AVMClass(name_idx))
|
||||
u30() # super_name idx
|
||||
flags = read_byte()
|
||||
if flags & 0x08 != 0: # Protected namespace is present
|
||||
@ -668,21 +683,22 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
parse_traits_info()
|
||||
assert len(classes) == class_count
|
||||
|
||||
if searched_class_id is None:
|
||||
TARGET_CLASSNAME = u'SignatureDecipher'
|
||||
searched_class = next(
|
||||
c for c in classes if c.name == TARGET_CLASSNAME)
|
||||
if searched_class is None:
|
||||
raise ExtractorError(u'Target class %r not found' %
|
||||
TARGET_CLASSNAME)
|
||||
|
||||
method_names = {}
|
||||
method_idxs = {}
|
||||
for class_id in range(class_count):
|
||||
for avm_class in classes:
|
||||
u30() # cinit
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
trait_methods = parse_traits_info()
|
||||
if class_id == searched_class_id:
|
||||
method_names.update(trait_methods.items())
|
||||
method_idxs.update(dict(
|
||||
avm_class.method_names.update(trait_methods.items())
|
||||
avm_class.method_idxs.update(dict(
|
||||
(idx, name)
|
||||
for name, idx in trait_methods.items()))
|
||||
|
||||
@ -697,7 +713,6 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
# Method bodies
|
||||
method_body_count = u30()
|
||||
Method = collections.namedtuple('Method', ['code', 'local_count'])
|
||||
methods = {}
|
||||
for _c in range(method_body_count):
|
||||
method_idx = u30()
|
||||
u30() # max_stack
|
||||
@ -706,9 +721,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
u30() # max_scope_depth
|
||||
code_length = u30()
|
||||
code = read_bytes(code_length)
|
||||
if method_idx in method_idxs:
|
||||
for avm_class in classes:
|
||||
if method_idx in avm_class.method_idxs:
|
||||
m = Method(code, local_count)
|
||||
methods[method_idxs[method_idx]] = m
|
||||
avm_class.methods[avm_class.method_idxs[method_idx]] = m
|
||||
exception_count = u30()
|
||||
for _c2 in range(exception_count):
|
||||
u30() # from
|
||||
@ -721,16 +737,13 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
parse_traits_info()
|
||||
|
||||
assert p + code_reader.tell() == len(code_tag)
|
||||
assert len(methods) == len(method_idxs)
|
||||
|
||||
method_pyfunctions = {}
|
||||
|
||||
def extract_function(func_name):
|
||||
if func_name in method_pyfunctions:
|
||||
return method_pyfunctions[func_name]
|
||||
if func_name not in methods:
|
||||
def extract_function(avm_class, func_name):
|
||||
if func_name in avm_class.method_pyfunctions:
|
||||
return avm_class.method_pyfunctions[func_name]
|
||||
if func_name not in avm_class.methods:
|
||||
raise ExtractorError(u'Cannot find function %r' % func_name)
|
||||
m = methods[func_name]
|
||||
m = avm_class.methods[func_name]
|
||||
|
||||
def resfunc(args):
|
||||
registers = ['(this)'] + list(args) + [None] * m.local_count
|
||||
@ -738,7 +751,12 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
coder = io.BytesIO(m.code)
|
||||
while True:
|
||||
opcode = struct.unpack('!B', coder.read(1))[0]
|
||||
if opcode == 36: # pushbyte
|
||||
if opcode == 17: # iftrue
|
||||
offset = s24(coder)
|
||||
value = stack.pop()
|
||||
if value:
|
||||
coder.seek(coder.tell() + offset)
|
||||
elif opcode == 36: # pushbyte
|
||||
v = struct.unpack('!B', coder.read(1))[0]
|
||||
stack.append(v)
|
||||
elif opcode == 44: # pushstring
|
||||
@ -776,8 +794,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
assert isinstance(obj, list)
|
||||
res = args[0].join(obj)
|
||||
stack.append(res)
|
||||
elif mname in method_pyfunctions:
|
||||
stack.append(method_pyfunctions[mname](args))
|
||||
elif mname in avm_class.method_pyfunctions:
|
||||
stack.append(avm_class.method_pyfunctions[mname](args))
|
||||
else:
|
||||
raise NotImplementedError(
|
||||
u'Unsupported property %r on %r'
|
||||
@ -809,7 +827,17 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
elif opcode == 93: # findpropstrict
|
||||
index = u30(coder)
|
||||
mname = multinames[index]
|
||||
res = extract_function(mname)
|
||||
res = extract_function(avm_class, mname)
|
||||
stack.append(res)
|
||||
elif opcode == 94: # findproperty
|
||||
index = u30(coder)
|
||||
mname = multinames[index]
|
||||
res = avm_class.variables.get(mname)
|
||||
stack.append(res)
|
||||
elif opcode == 96: # getlex
|
||||
index = u30(coder)
|
||||
mname = multinames[index]
|
||||
res = avm_class.variables.get(mname)
|
||||
stack.append(res)
|
||||
elif opcode == 97: # setproperty
|
||||
index = u30(coder)
|
||||
@ -848,6 +876,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
value1 = stack.pop()
|
||||
res = value1 % value2
|
||||
stack.append(res)
|
||||
elif opcode == 175: # greaterequals
|
||||
value2 = stack.pop()
|
||||
value1 = stack.pop()
|
||||
result = value1 >= value2
|
||||
stack.append(result)
|
||||
elif opcode == 208: # getlocal_0
|
||||
stack.append(registers[0])
|
||||
elif opcode == 209: # getlocal_1
|
||||
@ -864,10 +897,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
raise NotImplementedError(
|
||||
u'Unsupported opcode %d' % opcode)
|
||||
|
||||
method_pyfunctions[func_name] = resfunc
|
||||
avm_class.method_pyfunctions[func_name] = resfunc
|
||||
return resfunc
|
||||
|
||||
initial_function = extract_function(u'decipher')
|
||||
initial_function = extract_function(searched_class, u'decipher')
|
||||
return lambda s: initial_function([s])
|
||||
|
||||
def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
|
||||
|
||||
Loading…
Reference in New Issue
Block a user