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annotate mod_filter_words/mod_filter_words.lua @ 4651:8231774f5bfd

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mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8 The `body:sub()` call risks splitting the string in the middle of a multi-byte UTF-8 sequence. This should have been caught by util.stanza validation, but that would have caused some havoc, at the very least causing the notification to not be sent. There have been no reports of this happening. Likely because this module isn't widely deployed among users with languages that use many longer UTF-8 sequences. The util.encodings.utf8.valid() function is O(n) where only the last sequence really needs to be checked, but it's in C and expected to be fast.
author Kim Alvefur <zash@zash.se>
date Sun, 22 Aug 2021 13:22:59 +0200
parents 677fc0203da0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
Matthew Wild <mwild1@gmail.com>
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1 local filters = require "util.filters";
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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2
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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3 local replacements = module:get_option("filter_words", {});
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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4
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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5 if not replacements then
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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6 module:log("warn", "No 'filter_words' option set, filters inactive");
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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7 return
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8 end
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9
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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10 function filter_stanza(stanza)
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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11 if stanza.name == "message" then
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12 local body = stanza:get_child("body");
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13 if body then
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14 body[1] = body[1]:gsub("%a+", replacements);
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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15 end
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16 end
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
Matthew Wild <mwild1@gmail.com>
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17 return stanza;
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18 end
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19
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20 function filter_session(session)
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21 filters.add_filter(session, "stanzas/in", filter_stanza);
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22 end
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23
677fc0203da0 mod_filter_words: Very basic module in its early stages, to filter words in messages
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24 function module.load()
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25 if module.reloading then
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26 module:log("warn", "RELOADING!!!");
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27 end
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28 filters.add_filter_hook(filter_session);
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29 end
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30
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31 function module.unload()
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32 filters.remove_filter_hook(filter_session);
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33 end