mirror of
https://github.com/yt-dlp/yt-dlp.git
synced 2025-11-04 08:35:12 +00:00
627 lines
26 KiB
Python
627 lines
26 KiB
Python
import collections
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import contextlib
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import itertools
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import json
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import math
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import operator
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import re
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from .utils import (
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NO_DEFAULT,
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ExtractorError,
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js_to_json,
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remove_quotes,
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truncate_string,
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unified_timestamp,
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write_string,
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)
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_NAME_RE = r'[a-zA-Z_$][\w$]*'
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_OPERATORS = { # None => Defined in JSInterpreter._operator
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'?': None,
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'||': None,
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'&&': None,
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'&': operator.and_,
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'|': operator.or_,
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'^': operator.xor,
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# FIXME: This should actually be below comparision
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'>>': operator.rshift,
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'<<': operator.lshift,
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'<=': operator.le,
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'>=': operator.ge,
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'<': operator.lt,
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'>': operator.gt,
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'+': operator.add,
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'-': operator.sub,
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'*': operator.mul,
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'/': operator.truediv,
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'%': operator.mod,
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}
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_MATCHING_PARENS = dict(zip('({[', ')}]'))
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_QUOTES = '\'"'
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def _ternary(cndn, if_true=True, if_false=False):
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"""Simulate JS's ternary operator (cndn?if_true:if_false)"""
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if cndn in (False, None, 0, ''):
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return if_false
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with contextlib.suppress(TypeError):
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if math.isnan(cndn): # NB: NaN cannot be checked by membership
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return if_false
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return if_true
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class JS_Break(ExtractorError):
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def __init__(self):
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ExtractorError.__init__(self, 'Invalid break')
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class JS_Continue(ExtractorError):
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def __init__(self):
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ExtractorError.__init__(self, 'Invalid continue')
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class LocalNameSpace(collections.ChainMap):
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def __setitem__(self, key, value):
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for scope in self.maps:
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if key in scope:
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scope[key] = value
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return
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self.maps[0][key] = value
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def __delitem__(self, key):
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raise NotImplementedError('Deleting is not supported')
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class Debugger:
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import sys
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ENABLED = 'pytest' in sys.modules
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@staticmethod
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def write(*args, level=100):
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write_string(f'[debug] JS: {" " * (100 - level)}'
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f'{" ".join(truncate_string(str(x), 50, 50) for x in args)}\n')
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@classmethod
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def wrap_interpreter(cls, f):
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def interpret_statement(self, stmt, local_vars, allow_recursion, *args, **kwargs):
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if cls.ENABLED and stmt.strip():
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cls.write(stmt, level=allow_recursion)
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ret, should_ret = f(self, stmt, local_vars, allow_recursion, *args, **kwargs)
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if cls.ENABLED and stmt.strip():
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cls.write(['->', '=>'][should_ret], repr(ret), '<-|', stmt, level=allow_recursion)
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return ret, should_ret
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return interpret_statement
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class JSInterpreter:
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__named_object_counter = 0
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def __init__(self, code, objects=None):
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self.code, self._functions = code, {}
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self._objects = {} if objects is None else objects
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class Exception(ExtractorError):
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def __init__(self, msg, expr=None, *args, **kwargs):
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if expr is not None:
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msg = f'{msg.rstrip()} in: {truncate_string(expr, 50, 50)}'
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super().__init__(msg, *args, **kwargs)
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def _named_object(self, namespace, obj):
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self.__named_object_counter += 1
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name = f'__yt_dlp_jsinterp_obj{self.__named_object_counter}'
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namespace[name] = obj
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return name
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@staticmethod
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def _separate(expr, delim=',', max_split=None):
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if not expr:
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return
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counters = {k: 0 for k in _MATCHING_PARENS.values()}
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start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1
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in_quote, escaping = None, False
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for idx, char in enumerate(expr):
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if not in_quote and char in _MATCHING_PARENS:
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counters[_MATCHING_PARENS[char]] += 1
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elif not in_quote and char in counters:
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counters[char] -= 1
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elif not escaping and char in _QUOTES and in_quote in (char, None):
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in_quote = None if in_quote else char
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escaping = not escaping and in_quote and char == '\\'
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if char != delim[pos] or any(counters.values()) or in_quote:
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pos = 0
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continue
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elif pos != delim_len:
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pos += 1
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continue
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yield expr[start: idx - delim_len]
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start, pos = idx + 1, 0
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splits += 1
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if max_split and splits >= max_split:
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break
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yield expr[start:]
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@classmethod
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def _separate_at_paren(cls, expr, delim):
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separated = list(cls._separate(expr, delim, 1))
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if len(separated) < 2:
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raise cls.Exception(f'No terminating paren {delim}', expr)
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return separated[0][1:].strip(), separated[1].strip()
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def _operator(self, op, left_val, right_expr, expr, local_vars, allow_recursion):
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if op in ('||', '&&'):
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if (op == '&&') ^ _ternary(left_val):
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return left_val # short circuiting
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elif op == '?':
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right_expr = _ternary(left_val, *self._separate(right_expr, ':', 1))
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right_val = self.interpret_expression(right_expr, local_vars, allow_recursion)
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if not _OPERATORS.get(op):
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return right_val
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try:
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return _OPERATORS[op](left_val, right_val)
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except Exception as e:
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raise self.Exception(f'Failed to evaluate {left_val!r} {op} {right_val!r}', expr, cause=e)
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def _index(self, obj, idx):
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if idx == 'length':
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return len(obj)
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try:
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return obj[int(idx)] if isinstance(obj, list) else obj[idx]
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except Exception as e:
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raise self.Exception(f'Cannot get index {idx}', repr(obj), cause=e)
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def _dump(self, obj, namespace):
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try:
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return json.dumps(obj)
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except TypeError:
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return self._named_object(namespace, obj)
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@Debugger.wrap_interpreter
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def interpret_statement(self, stmt, local_vars, allow_recursion=100):
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if allow_recursion < 0:
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raise self.Exception('Recursion limit reached')
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allow_recursion -= 1
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should_return = False
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sub_statements = list(self._separate(stmt, ';')) or ['']
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expr = stmt = sub_statements.pop().strip()
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for sub_stmt in sub_statements:
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ret, should_return = self.interpret_statement(sub_stmt, local_vars, allow_recursion)
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if should_return:
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return ret, should_return
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m = re.match(r'(?P<var>var\s)|return(?:\s+|$)', stmt)
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if m:
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expr = stmt[len(m.group(0)):].strip()
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should_return = not m.group('var')
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if not expr:
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return None, should_return
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if expr[0] in _QUOTES:
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inner, outer = self._separate(expr, expr[0], 1)
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inner = json.loads(js_to_json(f'{inner}{expr[0]}', strict=True))
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if not outer:
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return inner, should_return
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expr = self._named_object(local_vars, inner) + outer
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if expr.startswith('new '):
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obj = expr[4:]
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if obj.startswith('Date('):
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left, right = self._separate_at_paren(obj[4:], ')')
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expr = unified_timestamp(left[1:-1], False)
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if not expr:
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raise self.Exception(f'Failed to parse date {left!r}', expr)
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expr = self._dump(int(expr * 1000), local_vars) + right
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else:
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raise self.Exception(f'Unsupported object {obj}', expr)
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if expr.startswith('{'):
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inner, outer = self._separate_at_paren(expr, '}')
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inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
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if not outer or should_abort:
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return inner, should_abort or should_return
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else:
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expr = self._dump(inner, local_vars) + outer
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if expr.startswith('('):
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inner, outer = self._separate_at_paren(expr, ')')
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inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
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if not outer or should_abort:
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return inner, should_abort or should_return
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else:
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expr = self._dump(inner, local_vars) + outer
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if expr.startswith('['):
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inner, outer = self._separate_at_paren(expr, ']')
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name = self._named_object(local_vars, [
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self.interpret_expression(item, local_vars, allow_recursion)
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for item in self._separate(inner)])
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expr = name + outer
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m = re.match(r'(?P<try>try|finally)\s*|(?:(?P<catch>catch)|(?P<for>for)|(?P<switch>switch))\s*\(', expr)
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if m and m.group('try'):
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if expr[m.end()] == '{':
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try_expr, expr = self._separate_at_paren(expr[m.end():], '}')
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else:
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try_expr, expr = expr[m.end() - 1:], ''
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ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion)
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if should_abort:
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return ret, True
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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return ret, should_abort or should_return
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elif m and m.group('catch'):
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# We ignore the catch block
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_, expr = self._separate_at_paren(expr, '}')
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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return ret, should_abort or should_return
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elif m and m.group('for'):
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constructor, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
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if remaining.startswith('{'):
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body, expr = self._separate_at_paren(remaining, '}')
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else:
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switch_m = re.match(r'switch\s*\(', remaining) # FIXME
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if switch_m:
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switch_val, remaining = self._separate_at_paren(remaining[switch_m.end() - 1:], ')')
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body, expr = self._separate_at_paren(remaining, '}')
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body = 'switch(%s){%s}' % (switch_val, body)
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else:
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body, expr = remaining, ''
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start, cndn, increment = self._separate(constructor, ';')
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self.interpret_expression(start, local_vars, allow_recursion)
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while True:
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if not _ternary(self.interpret_expression(cndn, local_vars, allow_recursion)):
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break
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try:
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ret, should_abort = self.interpret_statement(body, local_vars, allow_recursion)
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if should_abort:
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return ret, True
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except JS_Break:
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break
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except JS_Continue:
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pass
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self.interpret_expression(increment, local_vars, allow_recursion)
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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return ret, should_abort or should_return
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elif m and m.group('switch'):
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switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
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switch_val = self.interpret_expression(switch_val, local_vars, allow_recursion)
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body, expr = self._separate_at_paren(remaining, '}')
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items = body.replace('default:', 'case default:').split('case ')[1:]
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for default in (False, True):
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matched = False
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for item in items:
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case, stmt = (i.strip() for i in self._separate(item, ':', 1))
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if default:
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matched = matched or case == 'default'
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elif not matched:
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matched = case != 'default' and switch_val == self.interpret_expression(case, local_vars, allow_recursion)
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if not matched:
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continue
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try:
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ret, should_abort = self.interpret_statement(stmt, local_vars, allow_recursion)
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if should_abort:
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return ret
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except JS_Break:
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break
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if matched:
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break
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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return ret, should_abort or should_return
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# Comma separated statements
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sub_expressions = list(self._separate(expr))
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expr = sub_expressions.pop().strip() if sub_expressions else ''
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for sub_expr in sub_expressions:
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ret, should_abort = self.interpret_statement(sub_expr, local_vars, allow_recursion)
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if should_abort:
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return ret, True
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for m in re.finditer(rf'''(?x)
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(?P<pre_sign>\+\+|--)(?P<var1>{_NAME_RE})|
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(?P<var2>{_NAME_RE})(?P<post_sign>\+\+|--)''', expr):
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var = m.group('var1') or m.group('var2')
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start, end = m.span()
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sign = m.group('pre_sign') or m.group('post_sign')
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ret = local_vars[var]
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local_vars[var] += 1 if sign[0] == '+' else -1
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if m.group('pre_sign'):
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ret = local_vars[var]
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expr = expr[:start] + self._dump(ret, local_vars) + expr[end:]
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if not expr:
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return None, should_return
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m = re.match(fr'''(?x)
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(?P<assign>
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(?P<out>{_NAME_RE})(?:\[(?P<index>[^\]]+?)\])?\s*
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(?P<op>{"|".join(map(re.escape, _OPERATORS))})?
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=(?P<expr>.*)$
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)|(?P<return>
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(?!if|return|true|false|null|undefined)(?P<name>{_NAME_RE})$
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)|(?P<indexing>
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(?P<in>{_NAME_RE})\[(?P<idx>.+)\]$
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)|(?P<attribute>
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(?P<var>{_NAME_RE})(?:\.(?P<member>[^(]+)|\[(?P<member2>[^\]]+)\])\s*
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)|(?P<function>
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(?P<fname>{_NAME_RE})\((?P<args>.*)\)$
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)''', expr)
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if m and m.group('assign'):
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left_val = local_vars.get(m.group('out'))
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if not m.group('index'):
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local_vars[m.group('out')] = self._operator(
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m.group('op'), left_val, m.group('expr'), expr, local_vars, allow_recursion)
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return local_vars[m.group('out')], should_return
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elif left_val is None:
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raise self.Exception(f'Cannot index undefined variable {m.group("out")}', expr)
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idx = self.interpret_expression(m.group('index'), local_vars, allow_recursion)
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if not isinstance(idx, (int, float)):
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raise self.Exception(f'List index {idx} must be integer', expr)
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idx = int(idx)
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left_val[idx] = self._operator(
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m.group('op'), left_val[idx], m.group('expr'), expr, local_vars, allow_recursion)
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return left_val[idx], should_return
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elif expr.isdigit():
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return int(expr), should_return
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elif expr == 'break':
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raise JS_Break()
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elif expr == 'continue':
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raise JS_Continue()
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elif m and m.group('return'):
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return local_vars[m.group('name')], should_return
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with contextlib.suppress(ValueError):
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return json.loads(js_to_json(expr, strict=True)), should_return
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if m and m.group('indexing'):
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val = local_vars[m.group('in')]
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idx = self.interpret_expression(m.group('idx'), local_vars, allow_recursion)
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return self._index(val, idx), should_return
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for op in _OPERATORS:
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separated = list(self._separate(expr, op))
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if len(separated) < 2:
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continue
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right_expr = separated.pop()
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while op == '-' and len(separated) > 1 and not separated[-1].strip():
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right_expr = f'-{right_expr}'
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separated.pop()
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left_val = self.interpret_expression(op.join(separated), local_vars, allow_recursion)
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return self._operator(op, 0 if left_val is None else left_val,
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right_expr, expr, local_vars, allow_recursion), should_return
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if m and m.group('attribute'):
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variable = m.group('var')
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member = m.group('member')
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if not member:
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member = self.interpret_expression(m.group('member2'), local_vars, allow_recursion)
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arg_str = expr[m.end():]
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if arg_str.startswith('('):
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arg_str, remaining = self._separate_at_paren(arg_str, ')')
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else:
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arg_str, remaining = None, arg_str
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def assertion(cndn, msg):
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""" assert, but without risk of getting optimized out """
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if not cndn:
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raise self.Exception(f'{member} {msg}', expr)
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def eval_method():
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if (variable, member) == ('console', 'debug'):
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if Debugger.ENABLED:
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Debugger.write(self.interpret_expression(f'[{arg_str}]', local_vars, allow_recursion))
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return
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types = {
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'String': str,
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'Math': float,
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}
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obj = local_vars.get(variable, types.get(variable, NO_DEFAULT))
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if obj is NO_DEFAULT:
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if variable not in self._objects:
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self._objects[variable] = self.extract_object(variable)
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obj = self._objects[variable]
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# Member access
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if arg_str is None:
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return self._index(obj, member)
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# Function call
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argvals = [
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self.interpret_expression(v, local_vars, allow_recursion)
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for v in self._separate(arg_str)]
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if obj == str:
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if member == 'fromCharCode':
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assertion(argvals, 'takes one or more arguments')
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return ''.join(map(chr, argvals))
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raise self.Exception(f'Unsupported String method {member}', expr)
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elif obj == float:
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if member == 'pow':
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assertion(len(argvals) == 2, 'takes two arguments')
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return argvals[0] ** argvals[1]
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raise self.Exception(f'Unsupported Math method {member}', expr)
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if member == 'split':
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assertion(argvals, 'takes one or more arguments')
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assertion(len(argvals) == 1, 'with limit argument is not implemented')
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return obj.split(argvals[0]) if argvals[0] else list(obj)
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elif member == 'join':
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assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(len(argvals) == 1, 'takes exactly one argument')
|
|
return argvals[0].join(obj)
|
|
elif member == 'reverse':
|
|
assertion(not argvals, 'does not take any arguments')
|
|
obj.reverse()
|
|
return obj
|
|
elif member == 'slice':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(len(argvals) == 1, 'takes exactly one argument')
|
|
return obj[argvals[0]:]
|
|
elif member == 'splice':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(argvals, 'takes one or more arguments')
|
|
index, howMany = map(int, (argvals + [len(obj)])[:2])
|
|
if index < 0:
|
|
index += len(obj)
|
|
add_items = argvals[2:]
|
|
res = []
|
|
for i in range(index, min(index + howMany, len(obj))):
|
|
res.append(obj.pop(index))
|
|
for i, item in enumerate(add_items):
|
|
obj.insert(index + i, item)
|
|
return res
|
|
elif member == 'unshift':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(argvals, 'takes one or more arguments')
|
|
for item in reversed(argvals):
|
|
obj.insert(0, item)
|
|
return obj
|
|
elif member == 'pop':
|
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
|
assertion(not argvals, 'does not take any arguments')
|
|
if not obj:
|
|
return
|
|
return obj.pop()
|
|
elif member == 'push':
|
|
assertion(argvals, 'takes one or more arguments')
|
|
obj.extend(argvals)
|
|
return obj
|
|
elif member == 'forEach':
|
|
assertion(argvals, 'takes one or more arguments')
|
|
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
|
|
f, this = (argvals + [''])[:2]
|
|
return [f((item, idx, obj), {'this': this}, allow_recursion) for idx, item in enumerate(obj)]
|
|
elif member == 'indexOf':
|
|
assertion(argvals, 'takes one or more arguments')
|
|
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
|
|
idx, start = (argvals + [0])[:2]
|
|
try:
|
|
return obj.index(idx, start)
|
|
except ValueError:
|
|
return -1
|
|
|
|
idx = int(member) if isinstance(obj, list) else member
|
|
return obj[idx](argvals, allow_recursion=allow_recursion)
|
|
|
|
if remaining:
|
|
ret, should_abort = self.interpret_statement(
|
|
self._named_object(local_vars, eval_method()) + remaining,
|
|
local_vars, allow_recursion)
|
|
return ret, should_return or should_abort
|
|
else:
|
|
return eval_method(), should_return
|
|
|
|
elif m and m.group('function'):
|
|
fname = m.group('fname')
|
|
argvals = [self.interpret_expression(v, local_vars, allow_recursion)
|
|
for v in self._separate(m.group('args'))]
|
|
if fname in local_vars:
|
|
return local_vars[fname](argvals, allow_recursion=allow_recursion), should_return
|
|
elif fname not in self._functions:
|
|
self._functions[fname] = self.extract_function(fname)
|
|
return self._functions[fname](argvals, allow_recursion=allow_recursion), should_return
|
|
|
|
raise self.Exception(
|
|
f'Unsupported JS expression {truncate_string(expr, 20, 20) if expr != stmt else ""}', stmt)
|
|
|
|
def interpret_expression(self, expr, local_vars, allow_recursion):
|
|
ret, should_return = self.interpret_statement(expr, local_vars, allow_recursion)
|
|
if should_return:
|
|
raise self.Exception('Cannot return from an expression', expr)
|
|
return ret
|
|
|
|
def extract_object(self, objname):
|
|
_FUNC_NAME_RE = r'''(?:[a-zA-Z$0-9]+|"[a-zA-Z$0-9]+"|'[a-zA-Z$0-9]+')'''
|
|
obj = {}
|
|
obj_m = re.search(
|
|
r'''(?x)
|
|
(?<!this\.)%s\s*=\s*{\s*
|
|
(?P<fields>(%s\s*:\s*function\s*\(.*?\)\s*{.*?}(?:,\s*)?)*)
|
|
}\s*;
|
|
''' % (re.escape(objname), _FUNC_NAME_RE),
|
|
self.code)
|
|
if not obj_m:
|
|
raise self.Exception(f'Could not find object {objname}')
|
|
fields = obj_m.group('fields')
|
|
# Currently, it only supports function definitions
|
|
fields_m = re.finditer(
|
|
r'''(?x)
|
|
(?P<key>%s)\s*:\s*function\s*\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}
|
|
''' % _FUNC_NAME_RE,
|
|
fields)
|
|
for f in fields_m:
|
|
argnames = f.group('args').split(',')
|
|
obj[remove_quotes(f.group('key'))] = self.build_function(argnames, f.group('code'))
|
|
|
|
return obj
|
|
|
|
def extract_function_code(self, funcname):
|
|
""" @returns argnames, code """
|
|
func_m = re.search(
|
|
r'''(?xs)
|
|
(?:
|
|
function\s+%(name)s|
|
|
[{;,]\s*%(name)s\s*=\s*function|
|
|
var\s+%(name)s\s*=\s*function
|
|
)\s*
|
|
\((?P<args>[^)]*)\)\s*
|
|
(?P<code>{.+})''' % {'name': re.escape(funcname)},
|
|
self.code)
|
|
code, _ = self._separate_at_paren(func_m.group('code'), '}')
|
|
if func_m is None:
|
|
raise self.Exception(f'Could not find JS function "{funcname}"')
|
|
return [x.strip() for x in func_m.group('args').split(',')], code
|
|
|
|
def extract_function(self, funcname):
|
|
return self.extract_function_from_code(*self.extract_function_code(funcname))
|
|
|
|
def extract_function_from_code(self, argnames, code, *global_stack):
|
|
local_vars = {}
|
|
while True:
|
|
mobj = re.search(r'function\((?P<args>[^)]*)\)\s*{', code)
|
|
if mobj is None:
|
|
break
|
|
start, body_start = mobj.span()
|
|
body, remaining = self._separate_at_paren(code[body_start - 1:], '}')
|
|
name = self._named_object(local_vars, self.extract_function_from_code(
|
|
[x.strip() for x in mobj.group('args').split(',')],
|
|
body, local_vars, *global_stack))
|
|
code = code[:start] + name + remaining
|
|
return self.build_function(argnames, code, local_vars, *global_stack)
|
|
|
|
def call_function(self, funcname, *args):
|
|
return self.extract_function(funcname)(args)
|
|
|
|
def build_function(self, argnames, code, *global_stack):
|
|
global_stack = list(global_stack) or [{}]
|
|
argnames = tuple(argnames)
|
|
|
|
def resf(args, kwargs={}, allow_recursion=100):
|
|
global_stack[0].update({
|
|
**dict(itertools.zip_longest(argnames, args, fillvalue=None)),
|
|
**kwargs
|
|
})
|
|
var_stack = LocalNameSpace(*global_stack)
|
|
ret, should_abort = self.interpret_statement(code.replace('\n', ''), var_stack, allow_recursion - 1)
|
|
if should_abort:
|
|
return ret
|
|
return resf
|