Mercurial > libervia-backend
comparison sat/plugins/plugin_comp_ap_gateway/regex.py @ 3741:eddab3798aca
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 |
| parents | |
| children | 381340b9a9ee |
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| 3740:ea6fda69bb9f | 3741:eddab3798aca |
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| 1 #!/usr/bin/env python3 | |
| 2 | |
| 3 # Libervia ActivityPub Gateway | |
| 4 # Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org) | |
| 5 | |
| 6 # This program is free software: you can redistribute it and/or modify | |
| 7 # it under the terms of the GNU Affero General Public License as published by | |
| 8 # the Free Software Foundation, either version 3 of the License, or | |
| 9 # (at your option) any later version. | |
| 10 | |
| 11 # This program is distributed in the hope that it will be useful, | |
| 12 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 # GNU Affero General Public License for more details. | |
| 15 | |
| 16 # You should have received a copy of the GNU Affero General Public License | |
| 17 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 18 | |
| 19 """Regular Expression to parse "Signature" header""" | |
| 20 | |
| 21 # those expression have been generated with abnf-to-regex | |
| 22 # (https://github.com/aas-core-works/abnf-to-regexp) | |
| 23 | |
| 24 # the base RFC 7320 ABNF rules come from https://github.com/EricGT/ABNF | |
| 25 | |
| 26 # here is the ABNF file used: | |
| 27 # --- | |
| 28 # BWS = OWS | |
| 29 # OWS = *( SP / HTAB ) | |
| 30 # tchar = "!" / "#" / "$" / "%" / "&" / "`" / "*" / "+" / "-" / "." / "^" / "_" / "\'" / "|" / "~" / DIGIT / ALPHA | |
| 31 # token = 1*tchar | |
| 32 # sig-param = token BWS "=" BWS ( token / quoted-string ) | |
| 33 # quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE | |
| 34 # qdtext = HTAB / SP / "!" / %x23-5B ; '#'-'[' | |
| 35 # / %x5D-7E ; ']'-'~' | |
| 36 # / obs-text | |
| 37 # quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text ) | |
| 38 # obs-text = %x80-FF | |
| 39 # --- | |
| 40 | |
| 41 import re | |
| 42 | |
| 43 ows = '[ \t]*' | |
| 44 bws = f'{ows}' | |
| 45 obs_text = '[\\x80-\\xff]' | |
| 46 qdtext = f'([\t !#-\\[\\]-~]|{obs_text})' | |
| 47 quoted_pair = f'\\\\([\t !-~]|{obs_text})' | |
| 48 quoted_string = f'"({qdtext}|{quoted_pair})*"' | |
| 49 tchar = "([!#$%&`*+\\-.^_]|\\\\'|[|~0-9a-zA-Z])" | |
| 50 token = f'({tchar})+' | |
| 51 RE_SIG_PARAM = re.compile( | |
| 52 f'(?P<key>{token}{bws})={bws}' | |
| 53 f'((?P<uq_value>{token})|(?P<quoted_value>{quoted_string}))' | |
| 54 ) |