mirror of
https://github.com/ytdl-org/youtube-dl
synced 2024-11-27 10:56:48 +01:00
[youtube] Move swfinterp into its own file
This commit is contained in:
Philipp Hagemeister
parent
5dc3552d85
commit
5425626790
@ -45,6 +45,12 @@ _TESTS = [
|
||||
u'2ACFC7A61CA478CD21425E5A57EBD73DDC78E22A.2094302436B2D377D14A3BBA23022D023B8BC25AA',
|
||||
u'A52CB8B320D22032ABB3A41D773D2B6342034902.A22E87CDD37DBE75A5E52412DC874AC16A7CFCA2',
|
||||
),
|
||||
(
|
||||
u'http://s.ytimg.com/yts/swfbin/player-vfl5vIhK2/watch_as3.swf',
|
||||
u'swf',
|
||||
86,
|
||||
u'23456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!?#$%&\'()*+,-./:;<=>"'
|
||||
),
|
||||
]
|
||||
|
||||
|
||||
@ -57,12 +63,12 @@ class TestSignature(unittest.TestCase):
|
||||
|
||||
|
||||
def make_tfunc(url, stype, sig_input, expected_sig):
|
||||
basename = url.rpartition('/')[2]
|
||||
m = re.match(r'.*-([a-zA-Z0-9_-]+)\.[a-z]+$', basename)
|
||||
assert m, '%r should follow URL format' % basename
|
||||
m = re.match(r'.*-([a-zA-Z0-9_-]+)(?:/watch_as3)?\.[a-z]+$', url)
|
||||
assert m, '%r should follow URL format' % url
|
||||
test_id = m.group(1)
|
||||
|
||||
def test_func(self):
|
||||
basename = 'player-%s.%s' % (test_id, stype)
|
||||
fn = os.path.join(self.TESTDATA_DIR, basename)
|
||||
|
||||
if not os.path.exists(fn):
|
||||
|
||||
@ -14,6 +14,7 @@ import zlib
|
||||
from .common import InfoExtractor, SearchInfoExtractor
|
||||
from .subtitles import SubtitlesInfoExtractor
|
||||
from ..jsinterp import JSInterpreter
|
||||
from ..swfinterp import SWFInterpreter
|
||||
from ..utils import (
|
||||
compat_chr,
|
||||
compat_parse_qs,
|
||||
@ -450,457 +451,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
|
||||
return lambda s: initial_function([s])
|
||||
|
||||
def _parse_sig_swf(self, file_contents):
|
||||
if file_contents[1:3] != b'WS':
|
||||
raise ExtractorError(
|
||||
u'Not an SWF file; header is %r' % file_contents[:3])
|
||||
if file_contents[:1] == b'C':
|
||||
content = zlib.decompress(file_contents[8:])
|
||||
else:
|
||||
raise NotImplementedError(u'Unsupported compression format %r' %
|
||||
file_contents[:1])
|
||||
|
||||
def extract_tags(content):
|
||||
pos = 0
|
||||
while pos < len(content):
|
||||
header16 = struct.unpack('<H', content[pos:pos+2])[0]
|
||||
pos += 2
|
||||
tag_code = header16 >> 6
|
||||
tag_len = header16 & 0x3f
|
||||
if tag_len == 0x3f:
|
||||
tag_len = struct.unpack('<I', content[pos:pos+4])[0]
|
||||
pos += 4
|
||||
assert pos+tag_len <= len(content)
|
||||
yield (tag_code, content[pos:pos+tag_len])
|
||||
pos += tag_len
|
||||
|
||||
code_tag = next(tag
|
||||
for tag_code, tag in extract_tags(content)
|
||||
if tag_code == 82)
|
||||
p = code_tag.index(b'\0', 4) + 1
|
||||
code_reader = io.BytesIO(code_tag[p:])
|
||||
|
||||
# Parse ABC (AVM2 ByteCode)
|
||||
def read_int(reader=None):
|
||||
if reader is None:
|
||||
reader = code_reader
|
||||
res = 0
|
||||
shift = 0
|
||||
for _ in range(5):
|
||||
buf = reader.read(1)
|
||||
assert len(buf) == 1
|
||||
b = struct.unpack('<B', buf)[0]
|
||||
res = res | ((b & 0x7f) << shift)
|
||||
if b & 0x80 == 0:
|
||||
break
|
||||
shift += 7
|
||||
return res
|
||||
|
||||
def u30(reader=None):
|
||||
res = read_int(reader)
|
||||
assert res & 0xf0000000 == 0
|
||||
return res
|
||||
u32 = read_int
|
||||
|
||||
def s32(reader=None):
|
||||
v = read_int(reader)
|
||||
if v & 0x80000000 != 0:
|
||||
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
|
||||
slen = u30(reader)
|
||||
resb = reader.read(slen)
|
||||
assert len(resb) == slen
|
||||
return resb.decode('utf-8')
|
||||
|
||||
def read_bytes(count, reader=None):
|
||||
if reader is None:
|
||||
reader = code_reader
|
||||
resb = reader.read(count)
|
||||
assert len(resb) == count
|
||||
return resb
|
||||
|
||||
def read_byte(reader=None):
|
||||
resb = read_bytes(1, reader=reader)
|
||||
res = struct.unpack('<B', resb)[0]
|
||||
return res
|
||||
|
||||
# minor_version + major_version
|
||||
read_bytes(2 + 2)
|
||||
|
||||
# Constant pool
|
||||
int_count = u30()
|
||||
for _c in range(1, int_count):
|
||||
s32()
|
||||
uint_count = u30()
|
||||
for _c in range(1, uint_count):
|
||||
u32()
|
||||
double_count = u30()
|
||||
read_bytes((double_count-1) * 8)
|
||||
string_count = u30()
|
||||
constant_strings = [u'']
|
||||
for _c in range(1, string_count):
|
||||
s = read_string()
|
||||
constant_strings.append(s)
|
||||
namespace_count = u30()
|
||||
for _c in range(1, namespace_count):
|
||||
read_bytes(1) # kind
|
||||
u30() # name
|
||||
ns_set_count = u30()
|
||||
for _c in range(1, ns_set_count):
|
||||
count = u30()
|
||||
for _c2 in range(count):
|
||||
u30()
|
||||
multiname_count = u30()
|
||||
MULTINAME_SIZES = {
|
||||
0x07: 2, # QName
|
||||
0x0d: 2, # QNameA
|
||||
0x0f: 1, # RTQName
|
||||
0x10: 1, # RTQNameA
|
||||
0x11: 0, # RTQNameL
|
||||
0x12: 0, # RTQNameLA
|
||||
0x09: 2, # Multiname
|
||||
0x0e: 2, # MultinameA
|
||||
0x1b: 1, # MultinameL
|
||||
0x1c: 1, # MultinameLA
|
||||
}
|
||||
multinames = [u'']
|
||||
for _c in range(1, multiname_count):
|
||||
kind = u30()
|
||||
assert kind in MULTINAME_SIZES, u'Invalid multiname kind %r' % kind
|
||||
if kind == 0x07:
|
||||
u30() # namespace_idx
|
||||
name_idx = u30()
|
||||
multinames.append(constant_strings[name_idx])
|
||||
else:
|
||||
multinames.append('[MULTINAME kind: %d]' % kind)
|
||||
for _c2 in range(MULTINAME_SIZES[kind]):
|
||||
u30()
|
||||
|
||||
# Methods
|
||||
method_count = u30()
|
||||
MethodInfo = collections.namedtuple(
|
||||
'MethodInfo',
|
||||
['NEED_ARGUMENTS', 'NEED_REST'])
|
||||
method_infos = []
|
||||
for method_id in range(method_count):
|
||||
param_count = u30()
|
||||
u30() # return type
|
||||
for _ in range(param_count):
|
||||
u30() # param type
|
||||
u30() # name index (always 0 for youtube)
|
||||
flags = read_byte()
|
||||
if flags & 0x08 != 0:
|
||||
# Options present
|
||||
option_count = u30()
|
||||
for c in range(option_count):
|
||||
u30() # val
|
||||
read_bytes(1) # kind
|
||||
if flags & 0x80 != 0:
|
||||
# Param names present
|
||||
for _ in range(param_count):
|
||||
u30() # param name
|
||||
mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
|
||||
method_infos.append(mi)
|
||||
|
||||
# Metadata
|
||||
metadata_count = u30()
|
||||
for _c in range(metadata_count):
|
||||
u30() # name
|
||||
item_count = u30()
|
||||
for _c2 in range(item_count):
|
||||
u30() # key
|
||||
u30() # value
|
||||
|
||||
def parse_traits_info():
|
||||
trait_name_idx = u30()
|
||||
kind_full = read_byte()
|
||||
kind = kind_full & 0x0f
|
||||
attrs = kind_full >> 4
|
||||
methods = {}
|
||||
if kind in [0x00, 0x06]: # Slot or Const
|
||||
u30() # Slot id
|
||||
u30() # type_name_idx
|
||||
vindex = u30()
|
||||
if vindex != 0:
|
||||
read_byte() # vkind
|
||||
elif kind in [0x01, 0x02, 0x03]: # Method / Getter / Setter
|
||||
u30() # disp_id
|
||||
method_idx = u30()
|
||||
methods[multinames[trait_name_idx]] = method_idx
|
||||
elif kind == 0x04: # Class
|
||||
u30() # slot_id
|
||||
u30() # classi
|
||||
elif kind == 0x05: # Function
|
||||
u30() # slot_id
|
||||
function_idx = u30()
|
||||
methods[function_idx] = multinames[trait_name_idx]
|
||||
else:
|
||||
raise ExtractorError(u'Unsupported trait kind %d' % kind)
|
||||
|
||||
if attrs & 0x4 != 0: # Metadata present
|
||||
metadata_count = u30()
|
||||
for _c3 in range(metadata_count):
|
||||
u30() # metadata index
|
||||
|
||||
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
|
||||
class_count = u30()
|
||||
classes = []
|
||||
for class_id in range(class_count):
|
||||
name_idx = u30()
|
||||
classes.append(AVMClass(name_idx))
|
||||
u30() # super_name idx
|
||||
flags = read_byte()
|
||||
if flags & 0x08 != 0: # Protected namespace is present
|
||||
u30() # protected_ns_idx
|
||||
intrf_count = u30()
|
||||
for _c2 in range(intrf_count):
|
||||
u30()
|
||||
u30() # iinit
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
parse_traits_info()
|
||||
assert len(classes) == class_count
|
||||
|
||||
swfi = SWFInterpreter(file_contents)
|
||||
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)
|
||||
|
||||
for avm_class in classes:
|
||||
u30() # cinit
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
trait_methods = parse_traits_info()
|
||||
avm_class.method_names.update(trait_methods.items())
|
||||
avm_class.method_idxs.update(dict(
|
||||
(idx, name)
|
||||
for name, idx in trait_methods.items()))
|
||||
|
||||
# Scripts
|
||||
script_count = u30()
|
||||
for _c in range(script_count):
|
||||
u30() # init
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
parse_traits_info()
|
||||
|
||||
# Method bodies
|
||||
method_body_count = u30()
|
||||
Method = collections.namedtuple('Method', ['code', 'local_count'])
|
||||
for _c in range(method_body_count):
|
||||
method_idx = u30()
|
||||
u30() # max_stack
|
||||
local_count = u30()
|
||||
u30() # init_scope_depth
|
||||
u30() # max_scope_depth
|
||||
code_length = u30()
|
||||
code = read_bytes(code_length)
|
||||
for avm_class in classes:
|
||||
if method_idx in avm_class.method_idxs:
|
||||
m = Method(code, local_count)
|
||||
avm_class.methods[avm_class.method_idxs[method_idx]] = m
|
||||
exception_count = u30()
|
||||
for _c2 in range(exception_count):
|
||||
u30() # from
|
||||
u30() # to
|
||||
u30() # target
|
||||
u30() # exc_type
|
||||
u30() # var_name
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
parse_traits_info()
|
||||
|
||||
assert p + code_reader.tell() == len(code_tag)
|
||||
|
||||
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 = avm_class.methods[func_name]
|
||||
|
||||
def resfunc(args):
|
||||
registers = ['(this)'] + list(args) + [None] * m.local_count
|
||||
stack = []
|
||||
coder = io.BytesIO(m.code)
|
||||
while True:
|
||||
opcode = struct.unpack('!B', coder.read(1))[0]
|
||||
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
|
||||
idx = u30(coder)
|
||||
stack.append(constant_strings[idx])
|
||||
elif opcode == 48: # pushscope
|
||||
# We don't implement the scope register, so we'll just
|
||||
# ignore the popped value
|
||||
stack.pop()
|
||||
elif opcode == 70: # callproperty
|
||||
index = u30(coder)
|
||||
mname = multinames[index]
|
||||
arg_count = u30(coder)
|
||||
args = list(reversed(
|
||||
[stack.pop() for _ in range(arg_count)]))
|
||||
obj = stack.pop()
|
||||
if mname == u'split':
|
||||
assert len(args) == 1
|
||||
assert isinstance(args[0], compat_str)
|
||||
assert isinstance(obj, compat_str)
|
||||
if args[0] == u'':
|
||||
res = list(obj)
|
||||
else:
|
||||
res = obj.split(args[0])
|
||||
stack.append(res)
|
||||
elif mname == u'slice':
|
||||
assert len(args) == 1
|
||||
assert isinstance(args[0], int)
|
||||
assert isinstance(obj, list)
|
||||
res = obj[args[0]:]
|
||||
stack.append(res)
|
||||
elif mname == u'join':
|
||||
assert len(args) == 1
|
||||
assert isinstance(args[0], compat_str)
|
||||
assert isinstance(obj, list)
|
||||
res = args[0].join(obj)
|
||||
stack.append(res)
|
||||
elif mname in avm_class.method_pyfunctions:
|
||||
stack.append(avm_class.method_pyfunctions[mname](args))
|
||||
else:
|
||||
raise NotImplementedError(
|
||||
u'Unsupported property %r on %r'
|
||||
% (mname, obj))
|
||||
elif opcode == 72: # returnvalue
|
||||
res = stack.pop()
|
||||
return res
|
||||
elif opcode == 79: # callpropvoid
|
||||
index = u30(coder)
|
||||
mname = multinames[index]
|
||||
arg_count = u30(coder)
|
||||
args = list(reversed(
|
||||
[stack.pop() for _ in range(arg_count)]))
|
||||
obj = stack.pop()
|
||||
if mname == u'reverse':
|
||||
assert isinstance(obj, list)
|
||||
obj.reverse()
|
||||
else:
|
||||
raise NotImplementedError(
|
||||
u'Unsupported (void) property %r on %r'
|
||||
% (mname, obj))
|
||||
elif opcode == 86: # newarray
|
||||
arg_count = u30(coder)
|
||||
arr = []
|
||||
for i in range(arg_count):
|
||||
arr.append(stack.pop())
|
||||
arr = arr[::-1]
|
||||
stack.append(arr)
|
||||
elif opcode == 93: # findpropstrict
|
||||
index = u30(coder)
|
||||
mname = multinames[index]
|
||||
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)
|
||||
value = stack.pop()
|
||||
idx = stack.pop()
|
||||
obj = stack.pop()
|
||||
assert isinstance(obj, list)
|
||||
assert isinstance(idx, int)
|
||||
obj[idx] = value
|
||||
elif opcode == 98: # getlocal
|
||||
index = u30(coder)
|
||||
stack.append(registers[index])
|
||||
elif opcode == 99: # setlocal
|
||||
index = u30(coder)
|
||||
value = stack.pop()
|
||||
registers[index] = value
|
||||
elif opcode == 102: # getproperty
|
||||
index = u30(coder)
|
||||
pname = multinames[index]
|
||||
if pname == u'length':
|
||||
obj = stack.pop()
|
||||
assert isinstance(obj, list)
|
||||
stack.append(len(obj))
|
||||
else: # Assume attribute access
|
||||
idx = stack.pop()
|
||||
assert isinstance(idx, int)
|
||||
obj = stack.pop()
|
||||
assert isinstance(obj, list)
|
||||
stack.append(obj[idx])
|
||||
elif opcode == 128: # coerce
|
||||
u30(coder)
|
||||
elif opcode == 133: # coerce_s
|
||||
assert isinstance(stack[-1], (type(None), compat_str))
|
||||
elif opcode == 164: # modulo
|
||||
value2 = stack.pop()
|
||||
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
|
||||
stack.append(registers[1])
|
||||
elif opcode == 210: # getlocal_2
|
||||
stack.append(registers[2])
|
||||
elif opcode == 211: # getlocal_3
|
||||
stack.append(registers[3])
|
||||
elif opcode == 214: # setlocal_2
|
||||
registers[2] = stack.pop()
|
||||
elif opcode == 215: # setlocal_3
|
||||
registers[3] = stack.pop()
|
||||
else:
|
||||
raise NotImplementedError(
|
||||
u'Unsupported opcode %d' % opcode)
|
||||
|
||||
avm_class.method_pyfunctions[func_name] = resfunc
|
||||
return resfunc
|
||||
|
||||
initial_function = extract_function(searched_class, u'decipher')
|
||||
searched_class = swfi.extract_class(TARGET_CLASSNAME)
|
||||
initial_function = swfi.extract_function(searched_class, u'decipher')
|
||||
return lambda s: initial_function([s])
|
||||
|
||||
def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
|
||||
|
||||
503
youtube_dl/swfinterp.py
Normal file
503
youtube_dl/swfinterp.py
Normal file
@ -0,0 +1,503 @@
|
||||
from __future__ import unicode_literals
|
||||
|
||||
import collections
|
||||
import io
|
||||
import struct
|
||||
import zlib
|
||||
|
||||
from .utils import ExtractorError
|
||||
|
||||
|
||||
def _extract_tags(content):
|
||||
pos = 0
|
||||
while pos < len(content):
|
||||
header16 = struct.unpack('<H', content[pos:pos + 2])[0]
|
||||
pos += 2
|
||||
tag_code = header16 >> 6
|
||||
tag_len = header16 & 0x3f
|
||||
if tag_len == 0x3f:
|
||||
tag_len = struct.unpack('<I', content[pos:pos + 4])[0]
|
||||
pos += 4
|
||||
assert pos + tag_len <= len(content)
|
||||
yield (tag_code, content[pos:pos + tag_len])
|
||||
pos += tag_len
|
||||
|
||||
|
||||
class _AVMClass_Object(object):
|
||||
def __init__(self, avm_class):
|
||||
self.avm_class = avm_class
|
||||
|
||||
def __repr__(self):
|
||||
return '%s#%x' % (self.avm_class.name, id(self))
|
||||
|
||||
|
||||
class _AVMClass(object):
|
||||
def __init__(self, name_idx, name):
|
||||
self.name_idx = name_idx
|
||||
self.name = name
|
||||
self.method_names = {}
|
||||
self.method_idxs = {}
|
||||
self.methods = {}
|
||||
self.method_pyfunctions = {}
|
||||
self.variables = {}
|
||||
|
||||
def make_object(self):
|
||||
return _AVMClass_Object(self)
|
||||
|
||||
|
||||
def _read_int(reader):
|
||||
res = 0
|
||||
shift = 0
|
||||
for _ in range(5):
|
||||
buf = reader.read(1)
|
||||
assert len(buf) == 1
|
||||
b = struct.unpack('<B', buf)[0]
|
||||
res = res | ((b & 0x7f) << shift)
|
||||
if b & 0x80 == 0:
|
||||
break
|
||||
shift += 7
|
||||
return res
|
||||
|
||||
|
||||
def _u30(reader):
|
||||
res = _read_int(reader)
|
||||
assert res & 0xf0000000 == 0
|
||||
return res
|
||||
u32 = _read_int
|
||||
|
||||
|
||||
def _s32(reader):
|
||||
v = _read_int(reader)
|
||||
if v & 0x80000000 != 0:
|
||||
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):
|
||||
slen = _u30(reader)
|
||||
resb = reader.read(slen)
|
||||
assert len(resb) == slen
|
||||
return resb.decode('utf-8')
|
||||
|
||||
|
||||
def _read_bytes(count, reader):
|
||||
if reader is None:
|
||||
reader = code_reader
|
||||
resb = reader.read(count)
|
||||
assert len(resb) == count
|
||||
return resb
|
||||
|
||||
|
||||
def _read_byte(reader):
|
||||
resb = _read_bytes(1, reader=reader)
|
||||
res = struct.unpack('<B', resb)[0]
|
||||
return res
|
||||
|
||||
|
||||
class SWFInterpreter(object):
|
||||
def __init__(self, file_contents):
|
||||
if file_contents[1:3] != b'WS':
|
||||
raise ExtractorError(
|
||||
'Not an SWF file; header is %r' % file_contents[:3])
|
||||
if file_contents[:1] == b'C':
|
||||
content = zlib.decompress(file_contents[8:])
|
||||
else:
|
||||
raise NotImplementedError(
|
||||
'Unsupported compression format %r' %
|
||||
file_contents[:1])
|
||||
|
||||
code_tag = next(tag
|
||||
for tag_code, tag in _extract_tags(content)
|
||||
if tag_code == 82)
|
||||
p = code_tag.index(b'\0', 4) + 1
|
||||
code_reader = io.BytesIO(code_tag[p:])
|
||||
|
||||
# Parse ABC (AVM2 ByteCode)
|
||||
|
||||
# Define a couple convenience methods
|
||||
u30 = lambda *args: _u30(*args, reader=code_reader)
|
||||
s32 = lambda *args: _s32(*args, reader=code_reader)
|
||||
u32 = lambda *args: _u32(*args, reader=code_reader)
|
||||
read_bytes = lambda *args: _read_bytes(*args, reader=code_reader)
|
||||
read_byte = lambda *args: _read_byte(*args, reader=code_reader)
|
||||
|
||||
# minor_version + major_version
|
||||
read_bytes(2 + 2)
|
||||
|
||||
# Constant pool
|
||||
int_count = u30()
|
||||
for _c in range(1, int_count):
|
||||
s32()
|
||||
uint_count = u30()
|
||||
for _c in range(1, uint_count):
|
||||
u32()
|
||||
double_count = u30()
|
||||
read_bytes((double_count - 1) * 8)
|
||||
string_count = u30()
|
||||
constant_strings = ['']
|
||||
for _c in range(1, string_count):
|
||||
s = _read_string(code_reader)
|
||||
constant_strings.append(s)
|
||||
namespace_count = u30()
|
||||
for _c in range(1, namespace_count):
|
||||
read_bytes(1) # kind
|
||||
u30() # name
|
||||
ns_set_count = u30()
|
||||
for _c in range(1, ns_set_count):
|
||||
count = u30()
|
||||
for _c2 in range(count):
|
||||
u30()
|
||||
multiname_count = u30()
|
||||
MULTINAME_SIZES = {
|
||||
0x07: 2, # QName
|
||||
0x0d: 2, # QNameA
|
||||
0x0f: 1, # RTQName
|
||||
0x10: 1, # RTQNameA
|
||||
0x11: 0, # RTQNameL
|
||||
0x12: 0, # RTQNameLA
|
||||
0x09: 2, # Multiname
|
||||
0x0e: 2, # MultinameA
|
||||
0x1b: 1, # MultinameL
|
||||
0x1c: 1, # MultinameLA
|
||||
}
|
||||
self.multinames = ['']
|
||||
for _c in range(1, multiname_count):
|
||||
kind = u30()
|
||||
assert kind in MULTINAME_SIZES, 'Invalid multiname kind %r' % kind
|
||||
if kind == 0x07:
|
||||
u30() # namespace_idx
|
||||
name_idx = u30()
|
||||
self.multinames.append(constant_strings[name_idx])
|
||||
else:
|
||||
self.multinames.append('[MULTINAME kind: %d]' % kind)
|
||||
for _c2 in range(MULTINAME_SIZES[kind]):
|
||||
u30()
|
||||
|
||||
# Methods
|
||||
method_count = u30()
|
||||
MethodInfo = collections.namedtuple(
|
||||
'MethodInfo',
|
||||
['NEED_ARGUMENTS', 'NEED_REST'])
|
||||
method_infos = []
|
||||
for method_id in range(method_count):
|
||||
param_count = u30()
|
||||
u30() # return type
|
||||
for _ in range(param_count):
|
||||
u30() # param type
|
||||
u30() # name index (always 0 for youtube)
|
||||
flags = read_byte()
|
||||
if flags & 0x08 != 0:
|
||||
# Options present
|
||||
option_count = u30()
|
||||
for c in range(option_count):
|
||||
u30() # val
|
||||
read_bytes(1) # kind
|
||||
if flags & 0x80 != 0:
|
||||
# Param names present
|
||||
for _ in range(param_count):
|
||||
u30() # param name
|
||||
mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
|
||||
method_infos.append(mi)
|
||||
|
||||
# Metadata
|
||||
metadata_count = u30()
|
||||
for _c in range(metadata_count):
|
||||
u30() # name
|
||||
item_count = u30()
|
||||
for _c2 in range(item_count):
|
||||
u30() # key
|
||||
u30() # value
|
||||
|
||||
def parse_traits_info():
|
||||
trait_name_idx = u30()
|
||||
kind_full = read_byte()
|
||||
kind = kind_full & 0x0f
|
||||
attrs = kind_full >> 4
|
||||
methods = {}
|
||||
if kind in [0x00, 0x06]: # Slot or Const
|
||||
u30() # Slot id
|
||||
u30() # type_name_idx
|
||||
vindex = u30()
|
||||
if vindex != 0:
|
||||
read_byte() # vkind
|
||||
elif kind in [0x01, 0x02, 0x03]: # Method / Getter / Setter
|
||||
u30() # disp_id
|
||||
method_idx = u30()
|
||||
methods[self.multinames[trait_name_idx]] = method_idx
|
||||
elif kind == 0x04: # Class
|
||||
u30() # slot_id
|
||||
u30() # classi
|
||||
elif kind == 0x05: # Function
|
||||
u30() # slot_id
|
||||
function_idx = u30()
|
||||
methods[function_idx] = self.multinames[trait_name_idx]
|
||||
else:
|
||||
raise ExtractorError('Unsupported trait kind %d' % kind)
|
||||
|
||||
if attrs & 0x4 != 0: # Metadata present
|
||||
metadata_count = u30()
|
||||
for _c3 in range(metadata_count):
|
||||
u30() # metadata index
|
||||
|
||||
return methods
|
||||
|
||||
# Classes
|
||||
class_count = u30()
|
||||
classes = []
|
||||
for class_id in range(class_count):
|
||||
name_idx = u30()
|
||||
classes.append(_AVMClass(name_idx, self.multinames[name_idx]))
|
||||
u30() # super_name idx
|
||||
flags = read_byte()
|
||||
if flags & 0x08 != 0: # Protected namespace is present
|
||||
u30() # protected_ns_idx
|
||||
intrf_count = u30()
|
||||
for _c2 in range(intrf_count):
|
||||
u30()
|
||||
u30() # iinit
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
parse_traits_info()
|
||||
assert len(classes) == class_count
|
||||
self._classes_by_name = dict((c.name, c) for c in classes)
|
||||
|
||||
for avm_class in classes:
|
||||
u30() # cinit
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
trait_methods = parse_traits_info()
|
||||
avm_class.method_names.update(trait_methods.items())
|
||||
avm_class.method_idxs.update(dict(
|
||||
(idx, name)
|
||||
for name, idx in trait_methods.items()))
|
||||
|
||||
# Scripts
|
||||
script_count = u30()
|
||||
for _c in range(script_count):
|
||||
u30() # init
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
parse_traits_info()
|
||||
|
||||
# Method bodies
|
||||
method_body_count = u30()
|
||||
Method = collections.namedtuple('Method', ['code', 'local_count'])
|
||||
for _c in range(method_body_count):
|
||||
method_idx = u30()
|
||||
u30() # max_stack
|
||||
local_count = u30()
|
||||
u30() # init_scope_depth
|
||||
u30() # max_scope_depth
|
||||
code_length = u30()
|
||||
code = read_bytes(code_length)
|
||||
for avm_class in classes:
|
||||
if method_idx in avm_class.method_idxs:
|
||||
m = Method(code, local_count)
|
||||
avm_class.methods[avm_class.method_idxs[method_idx]] = m
|
||||
exception_count = u30()
|
||||
for _c2 in range(exception_count):
|
||||
u30() # from
|
||||
u30() # to
|
||||
u30() # target
|
||||
u30() # exc_type
|
||||
u30() # var_name
|
||||
trait_count = u30()
|
||||
for _c2 in range(trait_count):
|
||||
parse_traits_info()
|
||||
|
||||
assert p + code_reader.tell() == len(code_tag)
|
||||
|
||||
def extract_class(self, class_name):
|
||||
try:
|
||||
return self._classes_by_name[class_name]
|
||||
except KeyError:
|
||||
raise ExtractorError('Class %r not found' % class_name)
|
||||
|
||||
def extract_function(self, avm_class, func_name):
|
||||
if func_name in avm_class.method_pyfunctions:
|
||||
return avm_class.method_pyfunctions[func_name]
|
||||
if func_name in self._classes_by_name:
|
||||
return self._classes_by_name[func_name].make_object()
|
||||
if func_name not in avm_class.methods:
|
||||
raise ExtractorError('Cannot find function %r' % func_name)
|
||||
m = avm_class.methods[func_name]
|
||||
|
||||
def resfunc(args):
|
||||
# Helper functions
|
||||
coder = io.BytesIO(m.code)
|
||||
s24 = lambda: _s24(coder)
|
||||
u30 = lambda: _u30(coder)
|
||||
|
||||
print('Invoking %s.%s(%r)' % (avm_class.name, func_name, tuple(args)))
|
||||
registers = ['(this)'] + list(args) + [None] * m.local_count
|
||||
stack = []
|
||||
while True:
|
||||
opcode = _read_byte(coder)
|
||||
print('opcode: %r, stack(%d): %r' % (opcode, len(stack), stack))
|
||||
if opcode == 17: # iftrue
|
||||
offset = s24()
|
||||
value = stack.pop()
|
||||
if value:
|
||||
coder.seek(coder.tell() + offset)
|
||||
elif opcode == 36: # pushbyte
|
||||
v = _read_byte(coder)
|
||||
stack.append(v)
|
||||
elif opcode == 44: # pushstring
|
||||
idx = u30()
|
||||
stack.append(constant_strings[idx])
|
||||
elif opcode == 48: # pushscope
|
||||
# We don't implement the scope register, so we'll just
|
||||
# ignore the popped value
|
||||
new_scope = stack.pop()
|
||||
elif opcode == 70: # callproperty
|
||||
index = u30()
|
||||
mname = self.multinames[index]
|
||||
arg_count = u30()
|
||||
args = list(reversed(
|
||||
[stack.pop() for _ in range(arg_count)]))
|
||||
obj = stack.pop()
|
||||
if mname == 'split':
|
||||
assert len(args) == 1
|
||||
assert isinstance(args[0], compat_str)
|
||||
assert isinstance(obj, compat_str)
|
||||
if args[0] == '':
|
||||
res = list(obj)
|
||||
else:
|
||||
res = obj.split(args[0])
|
||||
stack.append(res)
|
||||
elif mname == 'slice':
|
||||
assert len(args) == 1
|
||||
assert isinstance(args[0], int)
|
||||
assert isinstance(obj, list)
|
||||
res = obj[args[0]:]
|
||||
stack.append(res)
|
||||
elif mname == 'join':
|
||||
assert len(args) == 1
|
||||
assert isinstance(args[0], compat_str)
|
||||
assert isinstance(obj, list)
|
||||
res = args[0].join(obj)
|
||||
stack.append(res)
|
||||
elif mname in avm_class.method_pyfunctions:
|
||||
stack.append(avm_class.method_pyfunctions[mname](args))
|
||||
else:
|
||||
raise NotImplementedError(
|
||||
'Unsupported property %r on %r'
|
||||
% (mname, obj))
|
||||
elif opcode == 72: # returnvalue
|
||||
res = stack.pop()
|
||||
return res
|
||||
elif opcode == 74: # constructproperty
|
||||
index = u30()
|
||||
arg_count = u30()
|
||||
args = list(reversed(
|
||||
[stack.pop() for _ in range(arg_count)]))
|
||||
obj = stack.pop()
|
||||
|
||||
mname = self.multinames[index]
|
||||
construct_method = self.extract_function(
|
||||
obj.avm_class, mname)
|
||||
# We do not actually call the constructor for now;
|
||||
# we just pretend it does nothing
|
||||
stack.append(obj)
|
||||
elif opcode == 79: # callpropvoid
|
||||
index = u30()
|
||||
mname = self.multinames[index]
|
||||
arg_count = u30()
|
||||
args = list(reversed(
|
||||
[stack.pop() for _ in range(arg_count)]))
|
||||
obj = stack.pop()
|
||||
if mname == 'reverse':
|
||||
assert isinstance(obj, list)
|
||||
obj.reverse()
|
||||
else:
|
||||
raise NotImplementedError(
|
||||
'Unsupported (void) property %r on %r'
|
||||
% (mname, obj))
|
||||
elif opcode == 86: # newarray
|
||||
arg_count = u30()
|
||||
arr = []
|
||||
for i in range(arg_count):
|
||||
arr.append(stack.pop())
|
||||
arr = arr[::-1]
|
||||
stack.append(arr)
|
||||
elif opcode == 93: # findpropstrict
|
||||
index = u30()
|
||||
mname = self.multinames[index]
|
||||
res = self.extract_function(avm_class, mname)
|
||||
stack.append(res)
|
||||
elif opcode == 94: # findproperty
|
||||
index = u30()
|
||||
mname = self.multinames[index]
|
||||
res = avm_class.variables.get(mname)
|
||||
stack.append(res)
|
||||
elif opcode == 96: # getlex
|
||||
index = u30()
|
||||
mname = self.multinames[index]
|
||||
res = avm_class.variables.get(mname, None)
|
||||
stack.append(res)
|
||||
elif opcode == 97: # setproperty
|
||||
index = u30()
|
||||
value = stack.pop()
|
||||
idx = self.multinames[index]
|
||||
obj = stack.pop()
|
||||
obj[idx] = value
|
||||
elif opcode == 98: # getlocal
|
||||
index = u30()
|
||||
stack.append(registers[index])
|
||||
elif opcode == 99: # setlocal
|
||||
index = u30()
|
||||
value = stack.pop()
|
||||
registers[index] = value
|
||||
elif opcode == 102: # getproperty
|
||||
index = u30()
|
||||
pname = self.multinames[index]
|
||||
if pname == 'length':
|
||||
obj = stack.pop()
|
||||
assert isinstance(obj, list)
|
||||
stack.append(len(obj))
|
||||
else: # Assume attribute access
|
||||
idx = stack.pop()
|
||||
assert isinstance(idx, int)
|
||||
obj = stack.pop()
|
||||
assert isinstance(obj, list)
|
||||
stack.append(obj[idx])
|
||||
elif opcode == 128: # coerce
|
||||
u30()
|
||||
elif opcode == 133: # coerce_s
|
||||
assert isinstance(stack[-1], (type(None), compat_str))
|
||||
elif opcode == 164: # modulo
|
||||
value2 = stack.pop()
|
||||
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
|
||||
stack.append(registers[1])
|
||||
elif opcode == 210: # getlocal_2
|
||||
stack.append(registers[2])
|
||||
elif opcode == 211: # getlocal_3
|
||||
stack.append(registers[3])
|
||||
elif opcode == 214: # setlocal_2
|
||||
registers[2] = stack.pop()
|
||||
elif opcode == 215: # setlocal_3
|
||||
registers[3] = stack.pop()
|
||||
else:
|
||||
raise NotImplementedError(
|
||||
'Unsupported opcode %d' % opcode)
|
||||
|
||||
avm_class.method_pyfunctions[func_name] = resfunc
|
||||
return resfunc
|
||||
|
||||
Loading…
Reference in New Issue
Block a user