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annotate sat/plugins/plugin_comp_ap_gateway/regex.py @ 3942:a92eef737703

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plugin XEP-0373: download public keys if they are not found in local storage: public keys were only obtained from PEP notifications, however this wasn't working if the entity was not in our roster. Now if no public key is retrieved from local storage, the public key node is requested, and an error is raised if nothing is found. This allows the use of OX with entities which are not in roster. rel 380
author Goffi <goffi@goffi.org>
date Sat, 15 Oct 2022 20:38:33 +0200
parents 381340b9a9ee
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")