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Merge pull request #1159 from jacksonmj/math
Prevent untrusted users from freezing the bot with Math.rpn, and allow factorial calculation for smaller numbers
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commit
8033e6ae14
@ -110,13 +110,18 @@ class Math(callbacks.Plugin):
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return math.sqrt(x)
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def _cbrt(x):
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return math.pow(x, 1.0/3)
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def _factorial(x):
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if x<=10000:
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return math.factorial(x)
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else:
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raise Exception('factorial argument too large')
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_mathEnv['sqrt'] = _sqrt
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_mathEnv['cbrt'] = _cbrt
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_mathEnv['abs'] = abs
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_mathEnv['max'] = max
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_mathEnv['min'] = min
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_mathSafeEnv = dict([(x,y) for x,y in _mathEnv.items()
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if x not in ['factorial']])
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_mathSafeEnv = dict([(x,y) for x,y in _mathEnv.items()])
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_mathSafeEnv['factorial'] = _factorial
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_mathRe = re.compile(r'((?:(?<![A-Fa-f\d)])-)?'
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r'(?:0x[A-Fa-f\d]+|'
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r'0[0-7]+|'
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@ -279,8 +284,8 @@ class Math(callbacks.Plugin):
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x = abs(x)
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stack.append(x)
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except ValueError: # Not a float.
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if arg in self._mathEnv:
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f = self._mathEnv[arg]
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if arg in self._mathSafeEnv:
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f = self._mathSafeEnv[arg]
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if callable(f):
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called = False
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arguments = []
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@ -303,7 +308,7 @@ class Math(callbacks.Plugin):
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arg1 = stack.pop()
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s = '%s%s%s' % (arg1, arg, arg2)
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try:
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stack.append(eval(s, self._mathEnv, self._mathEnv))
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stack.append(eval(s, self._mathSafeEnv, self._mathSafeEnv))
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except SyntaxError:
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irc.error(format(_('%q is not a defined function.'),
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arg))
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@ -114,7 +114,7 @@ class MathTestCase(PluginTestCase):
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self.assertNotError('calc (1600 * 1200) - 2*(1024*1280)')
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self.assertNotError('calc 3-2*4')
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self.assertNotError('calc (1600 * 1200)-2*(1024*1280)')
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self.assertError('calc factorial(99)')
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self.assertError('calc factorial(20000)')
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def testCalcNoNameError(self):
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self.assertNotRegexp('calc foobar(x)', 'NameError')
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@ -139,7 +139,7 @@ class MathTestCase(PluginTestCase):
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self.assertResponse('icalc 1^1', '0')
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self.assertResponse('icalc 10**24', '1' + '0'*24)
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self.assertRegexp('icalc 49/6', '8.16')
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self.assertNotError('icalc factorial(99)')
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self.assertNotError('icalc factorial(20000)')
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def testRpn(self):
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self.assertResponse('rpn 5 2 +', '7')
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