def _make_match_string_from_pattern(parsetree, makebad=False, groups=None):
collect = []
if groups is None:
groups = {}
for op, val in parsetree:
if op is sre_constants.LITERAL:
if makebad:
collect.append(chr((val ^ 4) & 0xFF)) # flip bit 4
if random.randint(0, 9) == 0:
makebad = False # don't error everything
else:
collect.append(chr(val))
elif op is sre_constants.CATEGORY:
collect.append(get_substitute(val, makebad))
elif op is sre_constants.IN:
if val[0][0] is sre_constants.CATEGORY:
collect.append(
_make_match_string_from_pattern(val, False, groups))
else:
collect.append(chr(random.choice(val)[1]))
elif op is sre_constants.BRANCH:
collect.append(
_make_match_string_from_pattern(val[1][random.randint(0, 1)],
False, groups))
elif op is sre_constants.SUBPATTERN:
string = _make_match_string_from_pattern(val[1], False, groups)
groups[val[0]] = string
collect.append(string)
elif op is sre_constants.MAX_REPEAT or op is sre_constants.MIN_REPEAT:
for i in xrange(random.randint(val[0], min(val[1], 10))):
collect.append(
_make_match_string_from_pattern(val[2], False, groups))
elif op is sre_constants.ANY:
collect.append(random.choice(ANYCHAR))
elif op is sre_constants.GROUPREF:
collect.append(groups[val])
elif op is sre_constants.AT:
pass # ignore anchors
else:
raise UnhandledOpError("Unhandled RE op: %r" % (op, ))
if makebad: # in case it didn't get done yet.
collect.insert(random.randrange(0, len(collect)),
random.choice(ascii.printable))
return "".join(collect)
def get(self, request):
# This key has to fit into a 32 bit int for the javascript side.
key = quote(struct.pack(b"I", random.randint(0, 4294967295)))
parms = {
b"redirect": request.GET.get("redir", request.environ.get("HTTP_REFERER", "/")),
b"key": key,
}
msg = request.GET.get("message")
if msg:
parms[b"message"] = '<p class="error">%s</p>' % (msg,)
else:
parms[b"message"] = ''
return framework.HttpResponse(LOGIN_PAGE % parms, b"application/xhtml+xml")
def _make_match_string_from_pattern(parsetree, makebad=False, groups=None):
collect = []
if groups is None:
groups = {}
for op, val in parsetree:
if op is sre_constants.LITERAL:
if makebad:
collect.append(chr((val ^ 4) & 0xFF)) # flip bit 4
if random.randint(0,9) == 0:
makebad = False # don't error everything
else:
collect.append(chr(val))
elif op is sre_constants.CATEGORY:
collect.append(get_substitute(val, makebad))
elif op is sre_constants.IN:
if val[0][0] is sre_constants.CATEGORY:
collect.append(_make_match_string_from_pattern(val, False, groups))
else:
collect.append(chr(random.choice(val)[1]))
elif op is sre_constants.BRANCH:
collect.append(_make_match_string_from_pattern(val[1][random.randint(0,1)], False, groups))
elif op is sre_constants.SUBPATTERN:
string = _make_match_string_from_pattern(val[1], False, groups)
groups[val[0]] = string
collect.append(string)
elif op is sre_constants.MAX_REPEAT or op is sre_constants.MIN_REPEAT:
for i in xrange(random.randint(val[0], min(val[1], 10))):
collect.append(_make_match_string_from_pattern(val[2], False, groups))
elif op is sre_constants.ANY:
collect.append(random.choice(ANYCHAR))
elif op is sre_constants.GROUPREF:
collect.append(groups[val])
elif op is sre_constants.AT:
pass # ignore anchors
else:
raise UnhandledOpError("Unhandled RE op: %r" % (op,))
if makebad: # in case it didn't get done yet.
collect.insert(random.randrange(0, len(collect)), random.choice(ascii.printable))
return "".join(collect)