9e2f4571f6
When a XEP-0372 mention is received, the linked pubsub item is looked after in cache, and if found, it is send to mentioned entity with `mention` tag added. However, this doesn't work in some cases (see incoming doc for details). To work around that, `@user@server.tld` type mention are also scanned in body, and mentions are added when found (this can be disabled with `auto_mentions` setting). Mention are only scanned in "public" messages, i.e. for pubsub items, and not direct messages. rel 369
64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
#!/usr/bin/env python3
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# Libervia ActivityPub Gateway
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# Copyright (C) 2009-2022 Jérôme Poisson (goffi@goffi.org)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""Various Regular Expression for AP gateway"""
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import re
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## "Signature" header parsing
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# those expression have been generated with abnf-to-regex
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# (https://github.com/aas-core-works/abnf-to-regexp)
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# the base RFC 7320 ABNF rules come from https://github.com/EricGT/ABNF
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# here is the ABNF file used:
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# ---
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# BWS = OWS
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# OWS = *( SP / HTAB )
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# tchar = "!" / "#" / "$" / "%" / "&" / "`" / "*" / "+" / "-" / "." / "^" / "_" / "\'" / "|" / "~" / DIGIT / ALPHA
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# token = 1*tchar
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# sig-param = token BWS "=" BWS ( token / quoted-string )
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# quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE
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# qdtext = HTAB / SP / "!" / %x23-5B ; '#'-'['
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# / %x5D-7E ; ']'-'~'
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# / obs-text
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# quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text )
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# obs-text = %x80-FF
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# ---
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ows = '[ \t]*'
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bws = f'{ows}'
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obs_text = '[\\x80-\\xff]'
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qdtext = f'([\t !#-\\[\\]-~]|{obs_text})'
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quoted_pair = f'\\\\([\t !-~]|{obs_text})'
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quoted_string = f'"({qdtext}|{quoted_pair})*"'
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tchar = "([!#$%&`*+\\-.^_]|\\\\'|[|~0-9a-zA-Z])"
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token = f'({tchar})+'
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RE_SIG_PARAM = re.compile(
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f'(?P<key>{token}{bws})={bws}'
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f'((?P<uq_value>{token})|(?P<quoted_value>{quoted_string}))'
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)
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## Account/Mention
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# FIXME: naive regex, should be approved following webfinger, but popular implementations
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# such as Mastodon use a very restricted subset
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RE_ACCOUNT = re.compile(r"[a-zA-Z0-9._-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-]+")
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RE_MENTION = re.compile(rf"(?<!\w)@{RE_ACCOUNT.pattern}\b")
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