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annotate sat/plugins/plugin_comp_ap_gateway/regex.py @ 3741:eddab3798aca

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comp AP gateway: regular expression to parse `Signature` header: rel 364
author Goffi <goffi@goffi.org>
date Tue, 22 Mar 2022 17:00:42 +0100
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children 381340b9a9ee
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3741
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1 #!/usr/bin/env python3
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2
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3 # Libervia ActivityPub Gateway
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4 # Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 """Regular Expression to parse "Signature" header"""
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20
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21 # those expression have been generated with abnf-to-regex
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22 # (https://github.com/aas-core-works/abnf-to-regexp)
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23
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24 # the base RFC 7320 ABNF rules come from https://github.com/EricGT/ABNF
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25
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26 # here is the ABNF file used:
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27 # ---
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28 # BWS = OWS
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29 # OWS = *( SP / HTAB )
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30 # tchar = "!" / "#" / "$" / "%" / "&" / "`" / "*" / "+" / "-" / "." / "^" / "_" / "\'" / "|" / "~" / DIGIT / ALPHA
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31 # token = 1*tchar
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32 # sig-param = token BWS "=" BWS ( token / quoted-string )
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33 # quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE
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34 # qdtext = HTAB / SP / "!" / %x23-5B ; '#'-'['
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35 # / %x5D-7E ; ']'-'~'
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36 # / obs-text
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37 # quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text )
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38 # obs-text = %x80-FF
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39 # ---
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40
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41 import re
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42
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43 ows = '[ \t]*'
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44 bws = f'{ows}'
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45 obs_text = '[\\x80-\\xff]'
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46 qdtext = f'([\t !#-\\[\\]-~]|{obs_text})'
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47 quoted_pair = f'\\\\([\t !-~]|{obs_text})'
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48 quoted_string = f'"({qdtext}|{quoted_pair})*"'
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49 tchar = "([!#$%&`*+\\-.^_]|\\\\'|[|~0-9a-zA-Z])"
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50 token = f'({tchar})+'
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51 RE_SIG_PARAM = re.compile(
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52 f'(?P<key>{token}{bws})={bws}'
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53 f'((?P<uq_value>{token})|(?P<quoted_value>{quoted_string}))'
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54 )