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annotate libervia/backend/plugins/plugin_comp_ap_gateway/regex.py @ 4351:6a0a081485b8

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plugin autocrypt: Autocrypt protocol implementation: Implementation of autocrypt: `autocrypt` header is checked, and if present and no public key is known for the peer, the key is imported. `autocrypt` header is also added to outgoing message (only if an email gateway is detected). For the moment, the JID is use as identifier, but the real email used by gateway should be used in the future. rel 456
author Goffi <goffi@goffi.org>
date Fri, 28 Feb 2025 09:23:35 +0100
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children
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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")