mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-23 16:17:49 +00:00
506 lines
13 KiB
Python
506 lines
13 KiB
Python
import operator, string, random, mmap, os, time
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import contrib.pyparsing as pp
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from netlib import http_status
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class ParseException(Exception):
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def __init__(self, msg, s, col):
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Exception.__init__(self)
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self.msg = msg
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self.s = s
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self.col = col
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def marked(self):
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return "%s\n%s"%(self.s, " "*(self.col-1) + "^")
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def __str__(self):
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return self.msg
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class ServerError(Exception): pass
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DATATYPES = dict(
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ascii_letters = string.ascii_letters,
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ascii_lowercase = string.ascii_lowercase,
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ascii_uppercase = string.ascii_uppercase,
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digits = string.digits,
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hexdigits = string.hexdigits,
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letters = string.letters,
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lowercase = string.lowercase,
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octdigits = string.octdigits,
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printable = string.printable,
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punctuation = string.punctuation,
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uppercase = string.uppercase,
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whitespace = string.whitespace,
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ascii = string.printable,
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bytes = "".join(chr(i) for i in range(256))
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)
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v_integer = pp.Regex(r"[+-]?\d+")\
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.setName("integer")\
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.setParseAction(lambda toks: int(toks[0]))
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v_literal = pp.MatchFirst(
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[
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pp.QuotedString("\"", escChar="\\", unquoteResults=True),
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pp.QuotedString("'", escChar="\\", unquoteResults=True),
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]
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)
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v_naked_literal = pp.MatchFirst(
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[
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v_literal,
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pp.Word("".join(i for i in pp.printables if i not in ",:"))
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]
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)
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class LiteralGenerator:
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def __init__(self, s):
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self.s = s
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def __eq__(self, other):
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return self[:] == other
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def __len__(self):
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return len(self.s)
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def __getitem__(self, x):
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return self.s.__getitem__(x)
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def __getslice__(self, a, b):
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return self.s.__getslice__(a, b)
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class RandomGenerator:
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def __init__(self, chars, length):
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self.chars = chars
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self.length = length
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def __len__(self):
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return self.length
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def __getitem__(self, x):
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return random.choice(self.chars)
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def __getslice__(self, a, b):
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b = min(b, self.length)
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return "".join(random.choice(self.chars) for x in range(a, b))
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class FileGenerator:
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def __init__(self, path):
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self.path = path
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self.fp = file(path, "r")
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self.map = mmap.mmap(self.fp.fileno(), 0, prot=mmap.PROT_READ)
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def __len__(self):
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return len(self.map)
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def __getitem__(self, x):
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return self.map.__getitem__(x)
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def __getslice__(self, a, b):
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return self.map.__getslice__(a, b)
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class ValueLiteral:
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def __init__(self, val):
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self.val = val
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def get_generator(self, settings):
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return LiteralGenerator(self.val)
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@classmethod
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def expr(klass):
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e = v_literal.copy()
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return e.setParseAction(lambda x: klass(*x))
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def __str__(self):
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return self.val
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class ValueGenerate:
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UNITS = dict(
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b = 1024**0,
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k = 1024**1,
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m = 1024**2,
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g = 1024**3,
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t = 1024**4,
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)
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def __init__(self, usize, unit, datatype):
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if not unit:
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unit = "b"
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self.usize, self.unit, self.datatype = usize, unit, datatype
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def bytes(self):
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return self.usize * self.UNITS[self.unit]
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def get_generator(self, settings):
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return RandomGenerator(DATATYPES[self.datatype], self.bytes())
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@classmethod
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def expr(klass):
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e = pp.Literal("@").suppress() + v_integer
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u = reduce(operator.or_, [pp.Literal(i) for i in klass.UNITS.keys()])
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e = e + pp.Optional(u, default=None)
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s = pp.Literal(",").suppress()
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s += reduce(operator.or_, [pp.Literal(i) for i in DATATYPES.keys()])
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e += pp.Optional(s, default="bytes")
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return e.setParseAction(lambda x: klass(*x))
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def __str__(self):
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return "@%s%s,%s"%(self.usize, self.unit, self.datatype)
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class ValueFile:
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def __init__(self, path):
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self.path = path
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@classmethod
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def expr(klass):
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e = pp.Literal("<").suppress()
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e = e + v_naked_literal
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return e.setParseAction(lambda x: klass(*x))
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def get_generator(self, settings):
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sd = settings.get("staticdir")
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if not sd:
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raise ServerError("No static directory specified.")
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path = os.path.join(sd, self.path)
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if not os.path.exists(path):
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raise ServerError("Static file does not exist: %s"%path)
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return FileGenerator(path)
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def __str__(self):
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return "<%s"%(self.path)
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Value = pp.MatchFirst(
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[
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ValueGenerate.expr(),
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ValueFile.expr(),
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ValueLiteral.expr()
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]
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)
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class ShortcutContentType:
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def __init__(self, value):
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self.value = value
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def mod_response(self, settings, r):
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r.headers.append(
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(
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LiteralGenerator("Content-Type"),
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self.value.get_generator(settings)
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)
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)
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@classmethod
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def expr(klass):
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e = pp.Literal("c").suppress()
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e = e + Value
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return e.setParseAction(lambda x: klass(*x))
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class ShortcutLocation:
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def __init__(self, value):
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self.value = value
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def mod_response(self, settings, r):
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r.headers.append(
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(
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LiteralGenerator("Location"),
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self.value.get_generator(settings)
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)
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)
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@classmethod
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def expr(klass):
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e = pp.Literal("l").suppress()
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e = e + Value
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return e.setParseAction(lambda x: klass(*x))
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class Body:
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def __init__(self, value):
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self.value = value
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def mod_response(self, settings, r):
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r.body = self.value.get_generator(settings)
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@classmethod
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def expr(klass):
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e = pp.Literal("b").suppress()
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e = e + Value
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return e.setParseAction(lambda x: klass(*x))
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class PauseAt:
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def __init__(self, seconds, offset):
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self.seconds, self.offset = seconds, offset
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@classmethod
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def expr(klass):
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e = pp.Literal("p").suppress()
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e +=pp.MatchFirst(
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[
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v_integer,
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pp.Literal("f")
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]
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)
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e += pp.Literal(",").suppress()
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e += pp.MatchFirst(
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[
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v_integer,
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pp.Literal("r"),
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pp.Literal("a"),
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]
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)
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return e.setParseAction(lambda x: klass(*x))
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def mod_response(self, settings, r):
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r.actions.append((self.offset, "pause", self.seconds))
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class DisconnectAt:
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def __init__(self, value):
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self.value = value
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def mod_response(self, settings, r):
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r.actions.append((self.value, "disconnect"))
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@classmethod
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def expr(klass):
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e = pp.Literal("d").suppress()
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e = e + pp.MatchFirst(
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[
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v_integer,
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pp.Literal("r")
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]
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)
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return e.setParseAction(lambda x: klass(*x))
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class Header:
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def __init__(self, key, value):
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self.key, self.value = key, value
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def mod_response(self, settings, r):
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r.headers.append(
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(
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self.key.get_generator(settings),
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self.value.get_generator(settings)
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)
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)
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@classmethod
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def expr(klass):
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e = pp.Literal("h").suppress()
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e += Value
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e += pp.Literal("=").suppress()
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e += Value
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return e.setParseAction(lambda x: klass(*x))
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class Code:
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def __init__(self, code, msg=None):
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self.code, self.msg = code, msg
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if msg is None:
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self.msg = ValueLiteral(http_status.RESPONSES.get(self.code, "Unknown code"))
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def mod_response(self, settings, r):
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r.code = self.code
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r.msg = self.msg.get_generator(settings)
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@classmethod
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def expr(klass):
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e = v_integer
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e = e + pp.Optional(
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Value
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)
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return e.setParseAction(lambda x: klass(*x))
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BLOCKSIZE = 1024
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class Response:
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comps = (
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Body,
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Header,
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PauseAt,
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DisconnectAt,
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ShortcutContentType,
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ShortcutLocation,
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)
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version = "HTTP/1.1"
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code = 200
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msg = LiteralGenerator(http_status.RESPONSES[code])
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body = LiteralGenerator("")
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def __init__(self):
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self.headers = []
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self.actions = []
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def get_header(self, hdr):
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for k, v in self.headers:
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if k[:len(hdr)].lower() == hdr:
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return v
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return None
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@classmethod
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def expr(klass):
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parts = [i.expr() for i in klass.comps]
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atom = pp.MatchFirst(parts)
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resp = pp.And(
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[
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Code.expr(),
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pp.ZeroOrMore(pp.Literal(":").suppress() + atom)
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]
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)
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return resp
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def length(self):
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l = len("%s %s "%(self.version, self.code))
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l += len(self.msg)
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l += 2
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for i in self.headers:
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l += len(i[0]) + len(i[1])
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l += 4
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l += 2
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l += len(self.body)
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return l
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def ready_actions(self, l, lst):
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ret = []
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for i in lst:
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itms = list(i)
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if i[0] == "r":
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itms[0] = random.randrange(l)
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if i[0] == "a":
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itms[0] = l+1
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ret.append(tuple(itms))
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ret.sort()
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return ret
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def write_values(self, fp, vals, actions, sofar=0, skip=0, blocksize=BLOCKSIZE):
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"""
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Return True if connection should disconnect.
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"""
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while vals:
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part = vals.pop()
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for i in range(skip, len(part), blocksize):
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d = part[i:i+blocksize]
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if actions and actions[-1][0] < (sofar + len(d)):
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p = actions.pop()
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offset = p[0]-sofar
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vals.append(part)
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if p[1] == "pause":
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fp.write(d[:offset])
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time.sleep(p[2])
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return self.write_values(
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fp, vals, actions,
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sofar=sofar+offset,
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skip=i+offset,
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blocksize=blocksize
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)
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elif p[1] == "disconnect":
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fp.write(d[:offset])
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return True
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fp.write(d)
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sofar += len(d)
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skip = 0
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def serve(self, fp):
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started = time.time()
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if self.body and not self.get_header("Content-Length"):
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self.headers.append(
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(
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LiteralGenerator("Content-Length"),
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LiteralGenerator(str(len(self.body))),
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)
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)
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hdrs = []
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for k, v in self.headers:
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hdrs.extend([
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k,
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": ",
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v,
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"\r\n",
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])
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vals = [
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"%s %s "%(self.version, self.code),
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self.msg,
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"\r\n",
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]
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vals.extend(hdrs)
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vals.append("\r\n")
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if self.body:
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vals.append(self.body)
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vals.reverse()
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actions = self.ready_actions(self.length(), self.actions)
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actions.reverse()
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disconnect = self.write_values(fp, vals, actions[:])
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duration = time.time() - started
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return dict(
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disconnect = disconnect,
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started = started,
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duration = duration,
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actions = actions,
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code = self.code,
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)
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def __str__(self):
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parts = [
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"%s %s"%(self.code, self.msg[:])
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]
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return "\n".join(parts)
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class CraftedResponse(Response):
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def __init__(self, settings, spec, tokens):
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Response.__init__(self)
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self.spec, self.tokens = spec, tokens
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for i in tokens:
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i.mod_response(settings, self)
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def serve(self, fp):
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d = Response.serve(self, fp)
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d["spec"] = self.spec
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return d
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class InternalResponse(Response):
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def __init__(self, code, body):
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Response.__init__(self)
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self.code = code
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self.msg = LiteralGenerator(http_status.RESPONSES.get(code, "Unknown error"))
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self.body = LiteralGenerator(body)
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self.headers = [
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(
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LiteralGenerator("Content-Type"),
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LiteralGenerator("text/plain")
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),
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(
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LiteralGenerator("Content-Length"),
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LiteralGenerator(str(len(self.body)))
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)
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]
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def serve(self, fp):
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d = Response.serve(self, fp)
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d["internal"] = True
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return d
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def parse(settings, s):
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try:
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return CraftedResponse(settings, s, Response.expr().parseString(s, parseAll=True))
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except pp.ParseException, v:
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raise ParseException(v.msg, v.line, v.col)
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