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annotate libervia/backend/plugins/plugin_comp_ap_gateway/regex.py @ 4095:684ba556a617

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core (memory/sqla_mapping): fix legacy pickled values: folloing packages refactoring, legacy pickled values could not be unpickled (due to use of old classes). This temporary workaround fix it, but the right thing to do will be to move from pickle to JSON at some point.
author Goffi <goffi@goffi.org>
date Mon, 12 Jun 2023 14:57:27 +0200
parents 4b842c1fb686
children 0d7bb4df2343
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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 """Various Regular Expression for AP gateway"""
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20
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21 import re
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22
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23 ## "Signature" header parsing
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24
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25 # those expression have been generated with abnf-to-regex
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26 # (https://github.com/aas-core-works/abnf-to-regexp)
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27
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28 # the base RFC 7320 ABNF rules come from https://github.com/EricGT/ABNF
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29
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30 # here is the ABNF file used:
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31 # ---
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32 # BWS = OWS
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33 # OWS = *( SP / HTAB )
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34 # tchar = "!" / "#" / "$" / "%" / "&" / "`" / "*" / "+" / "-" / "." / "^" / "_" / "\'" / "|" / "~" / DIGIT / ALPHA
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35 # token = 1*tchar
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36 # sig-param = token BWS "=" BWS ( token / quoted-string )
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37 # quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE
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38 # qdtext = HTAB / SP / "!" / %x23-5B ; '#'-'['
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39 # / %x5D-7E ; ']'-'~'
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40 # / obs-text
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41 # quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text )
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42 # obs-text = %x80-FF
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43 # ---
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44
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45 ows = '[ \t]*'
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46 bws = f'{ows}'
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47 obs_text = '[\\x80-\\xff]'
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48 qdtext = f'([\t !#-\\[\\]-~]|{obs_text})'
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49 quoted_pair = f'\\\\([\t !-~]|{obs_text})'
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50 quoted_string = f'"({qdtext}|{quoted_pair})*"'
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51 tchar = "([!#$%&`*+\\-.^_]|\\\\'|[|~0-9a-zA-Z])"
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52 token = f'({tchar})+'
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53 RE_SIG_PARAM = re.compile(
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54 f'(?P<key>{token}{bws})={bws}'
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55 f'((?P<uq_value>{token})|(?P<quoted_value>{quoted_string}))'
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56 )
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57
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58
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59 ## Account/Mention
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60
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61 # FIXME: naive regex, should be approved following webfinger, but popular implementations
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62 # such as Mastodon use a very restricted subset
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63 RE_ACCOUNT = re.compile(r"[a-zA-Z0-9._-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-]+")
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64 RE_MENTION = re.compile(rf"(?<!\w)@{RE_ACCOUNT.pattern}\b")