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annotate roundup/cgi/timestamp.py @ 7596:e5fa31aad344

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fix: replace bad reverted code change; allow js rate headers Last commit included an incorrect undo. I was going to move the Allow header/output format parsing earlier in the dispatch method. But I reverted it incorrectly and removed it instead. It has been added back in the former location. Header that allows javascript access to the rest rate limit header has been moved. The rate limit headers can be accessed by client side javascript regardless of the rate limit being exceeded.
author John Rouillard <rouilj@ieee.org>
date Thu, 03 Aug 2023 18:28:19 -0400
parents 07ce4e4110f5
children 216662fbaaee
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 '''Set of functions of adding/checking timestamp to be used to limit
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2 form submission for cgi actions.
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3 '''
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4
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5 import base64
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6 import binascii
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7 import struct
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8 import time
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9
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10 from roundup.cgi.exceptions import FormError
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11 from roundup.i18n import _
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12 from roundup.anypy.strings import b2s, s2b
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13
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15 def pack_timestamp():
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16 return b2s(base64.b64encode(struct.pack("i", int(time.time()))).strip())
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17
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18
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19 def unpack_timestamp(s):
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20 try:
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21 timestamp = struct.unpack("i", base64.b64decode(s2b(s)))[0]
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22 except (struct.error, binascii.Error, TypeError):
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23 raise FormError(_("Form is corrupted."))
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24 return timestamp
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25
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26
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27 class Timestamped:
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28 def timecheck(self, field, delay):
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29 try:
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30 created = unpack_timestamp(self.form[field].value)
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31 except KeyError:
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32 raise FormError(_("Form is corrupted, missing: %s." % field))
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33 if time.time() - created < delay:
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34 raise FormError(_("Responding to form too quickly."))
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35 return True
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