Update part of the js interpreter
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Florent
parent
3a7010f478
commit
a5eb1d789c
1 changed files with 95 additions and 26 deletions
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@ -187,7 +187,7 @@ class VideoPage(BaseYoutubePage):
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self._player_cache = {}
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def _extract_signature_function(self, video_id, player_url, slen):
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id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9_-]+)\.(?P<ext>[a-z]+)$',
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id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9_-]+)(?:/watch_as3|/html5player)?\.(?P<ext>[a-z]+)$',
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player_url)
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player_type = id_m.group('ext')
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player_id = id_m.group('id')
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@ -214,6 +214,8 @@ class VideoPage(BaseYoutubePage):
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u'Initial JS player signature function name')
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functions = {}
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objects = {}
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code = jscode
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def argidx(varname):
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return string.lowercase.index(varname)
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@ -245,12 +247,40 @@ class VideoPage(BaseYoutubePage):
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assign = lambda v: v
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expr = stmt[len(u'return '):]
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else:
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raise BrokenPageError(
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u'Cannot determine left side of statement in %r' % stmt)
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# Try interpreting it as an expression
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expr = stmt
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assign = lambda v: v
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v = interpret_expression(expr, local_vars, allow_recursion)
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return assign(v)
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def extract_object(objname):
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obj = {}
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obj_m = re.search(
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(r'(?:var\s+)?%s\s*=\s*\{' % re.escape(objname)) +
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r'\s*(?P<fields>([a-zA-Z$0-9]+\s*:\s*function\(.*?\)\s*\{.*?\})*)' +
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r'\}\s*;',
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code)
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fields = obj_m.group('fields')
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# Currently, it only supports function definitions
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fields_m = re.finditer(
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r'(?P<key>[a-zA-Z$0-9]+)\s*:\s*function'
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r'\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}',
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fields)
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for f in fields_m:
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argnames = f.group('args').split(',')
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obj[f.group('key')] = build_function(argnames, f.group('code'))
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return obj
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def build_function(argnames, code):
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def resf(args):
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local_vars = dict(zip(argnames, args))
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for stmt in code.split(';'):
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res = interpret_statement(stmt, local_vars)
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return res
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return resf
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def interpret_expression(expr, local_vars, allow_recursion):
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if expr.isdigit():
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return int(expr)
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@ -258,48 +288,87 @@ class VideoPage(BaseYoutubePage):
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if expr.isalpha():
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return local_vars[expr]
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m = re.match(r'^(?P<in>[a-z]+)\.(?P<member>.*)$', expr)
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try:
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return json.loads(expr)
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except ValueError:
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pass
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m = re.match(r'^(?P<var>[a-zA-Z0-9_]+)\.(?P<member>[^(]+)(?:\(+(?P<args>[^()]*)\))?$', expr)
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if m:
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variable = m.group('var')
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member = m.group('member')
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val = local_vars[m.group('in')]
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if member == 'split("")':
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return list(val)
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if member == 'join("")':
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return u''.join(val)
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if member == 'length':
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return len(val)
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if member == 'reverse()':
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return val[::-1]
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slice_m = re.match(r'slice\((?P<idx>.*)\)', member)
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if slice_m:
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idx = interpret_expression(
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slice_m.group('idx'), local_vars, allow_recursion-1)
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return val[idx:]
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arg_str = m.group('args')
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if variable in local_vars:
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obj = local_vars[variable]
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else:
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if variable not in objects:
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objects[variable] = extract_object(variable)
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obj = objects[variable]
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if arg_str is None:
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# Member access
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if member == 'length':
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return len(obj)
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return obj[member]
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assert expr.endswith(')')
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# Function call
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if arg_str == '':
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argvals = tuple()
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else:
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argvals = tuple([
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interpret_expression(v, local_vars, allow_recursion)
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for v in arg_str.split(',')])
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if member == 'split':
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assert argvals == ('',)
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return list(obj)
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if member == 'join':
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assert len(argvals) == 1
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return argvals[0].join(obj)
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if member == 'reverse':
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assert len(argvals) == 0
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obj.reverse()
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return obj
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if member == 'slice':
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assert len(argvals) == 1
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return obj[argvals[0]:]
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if member == 'splice':
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assert isinstance(obj, list)
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index, howMany = argvals
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res = []
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for i in range(index, min(index + howMany, len(obj))):
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res.append(obj.pop(index))
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return res
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return obj[member](argvals)
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m = re.match(
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r'^(?P<in>[a-z]+)\[(?P<idx>.+)\]$', expr)
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if m:
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val = local_vars[m.group('in')]
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idx = interpret_expression(m.group('idx'), local_vars,
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allow_recursion-1)
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idx = interpret_expression(
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m.group('idx'), local_vars, allow_recursion - 1)
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return val[idx]
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m = re.match(r'^(?P<a>.+?)(?P<op>[%])(?P<b>.+?)$', expr)
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if m:
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a = interpret_expression(m.group('a'),
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local_vars, allow_recursion)
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b = interpret_expression(m.group('b'),
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local_vars, allow_recursion)
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a = interpret_expression(
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m.group('a'), local_vars, allow_recursion)
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b = interpret_expression(
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m.group('b'), local_vars, allow_recursion)
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return a % b
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m = re.match(
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r'^(?P<func>[a-zA-Z$]+)\((?P<args>[a-z0-9,]+)\)$', expr)
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if m:
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fname = m.group('func')
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argvals = tuple([
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int(v) if v.isdigit() else local_vars[v]
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for v in m.group('args').split(',')])
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if fname not in functions:
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functions[fname] = extract_function(fname)
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argvals = [int(v) if v.isdigit() else local_vars[v]
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for v in m.group('args').split(',')]
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return functions[fname](argvals)
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raise BrokenPageError(u'Unsupported JS expression %r' % expr)
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