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annotate test/cmp_helper.py @ 5726:e199d0ae4a25

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issue2551033: prevent reverse engineering hidden data by using etags as an oracle to identify when the right data has been guessed. Identified by Joseph Myers who also suggested remediation methods. Implemented John Rouillard.
author John Rouillard <rouilj@ieee.org>
date Thu, 23 May 2019 18:56:57 -0400
parents 19bd4b413ed6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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5513
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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1 class StringFragmentCmpHelper:
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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2 def compareStringFragments(self, s, fragments):
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Christof Meerwald <cmeerw@cmeerw.org>
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3 """Compare a string agains a list of fragments where a tuple denotes a
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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4 set of alternatives
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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5 """
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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6 pos = 0
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Christof Meerwald <cmeerw@cmeerw.org>
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7 for frag in fragments:
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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8 if type(frag) != tuple:
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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9 self.assertEqual(s[pos:pos + len(frag)], frag)
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10 pos += len(frag)
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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11 else:
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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12 found = False
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Christof Meerwald <cmeerw@cmeerw.org>
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13 for alt in frag:
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Christof Meerwald <cmeerw@cmeerw.org>
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14 if s[pos:pos + len(alt)] == alt:
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Christof Meerwald <cmeerw@cmeerw.org>
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15 pos += len(alt)
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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16 found = True
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Christof Meerwald <cmeerw@cmeerw.org>
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17 break
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Christof Meerwald <cmeerw@cmeerw.org>
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18
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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19 if not found:
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Christof Meerwald <cmeerw@cmeerw.org>
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20 l = max(map(len, frag))
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Christof Meerwald <cmeerw@cmeerw.org>
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21 raise AssertionError('%s != %s' %
19bd4b413ed6 be more lenient when comparing string results
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22 (repr(s[pos:pos + l]), str(frag)))
19bd4b413ed6 be more lenient when comparing string results
Christof Meerwald <cmeerw@cmeerw.org>
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23 self.assertEqual(s[pos:], '')
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