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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
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children
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1 # mod_tweet_data
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2
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3 This module adds [Open Graph Protocol](https://ogp.me) metadata to Twitter.com tweet URLs sent inside a MUC.
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4
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5 It's similar to [mod_ogp](https://modules.prosody.im/mod_ogp.html) but is adapted specifically to Twitter.com, which doesn't support the [Open Graph Protocol](https://ogp.me).
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6
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7 When a user sends a tweet URL in a MUC (where the message has its `id` equal to its `origin-id`), this module calls that URL to get the tweet data.
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8 If it finds any, it sends a [XEP-0422 fastening](https://xmpp.org/extensions/xep-0422.html) applied to the original message that looks as follows (note, I haven't used real data here):
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9
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10 ```xml
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11 <message xmlns="jabber:client" to="user@chat.example.org/resource" from="chatroom@muc.example.org" type="groupchat">
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12 <apply-to xmlns="urn:xmpp:fasten:0" id="82dbc94c-c18a-4e51-a0d5-9fd3a7bfd267">
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13 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:article:author" content="TwitterCritter" />
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14 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:article:published_time" content="2021-06-22T06:44:20.000Z" />
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15 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:description" content="I'm in ur twitterz" />
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16 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:image" content="https://pbs.twimg.com/profile_images/984325764849045505/Ty3F93Ln_normal.jpg" />
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17 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:title" content="TwitterCritter" />
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18 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:type" content="tweet" />
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19 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:url" content="https://twitter.com/TwitterCritter/status/1407227938391707648" />
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20 </apply-to>
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21 <stanza-id xmlns="urn:xmpp:sid:0" by="chatroom@muc.example.org" id="90e8818d-390a-4c69-a2d8-0fd463fb3366"/>
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22 </message>
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23 ```
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25 Configuration
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26 -------------
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28 You'll need to provide a Twitter APIv2 bearer token.
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30 ```lua
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31 Component "muc.example.org" "muc"
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32 modules_enabled = { "tweet_data" }
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33 twitter_apiv2_bearer_token = { "some-very-long-string" }
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34 ```