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annotate mod_ogp/README.markdown @ 5853:97c9b76867ca

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mod_log_ringbuffer: Detach event handlers on logging reload (thanks Menel) Otherwise the global event handlers accumulate, one added each time logging is reoladed, and each invocation of the signal or event triggers one dump of each created ringbuffer.
author Kim Alvefur <zash@zash.se>
date Sun, 03 Mar 2024 11:23:40 +0100
parents 09f0911c735d
children
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1 # mod_ogp
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2
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3 This module adds [Open Graph Protocol](https://ogp.me) metadata to URLs sent inside a MUC.
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5 With mod_ogp enabled, when a user sends a URL in a MUC (where the message has its `id` equal to its `origin-id`), the module calls the URL and parses the result for `<meta>` html tags that have any `og:...` properties.
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6 If it finds any, it sends a [XEP-0422 fastening](https://xmpp.org/extensions/xep-0422.html) applied to the original message that looks like:
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8 ```xml
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9 <message id="example" from="chatroom@muc.example.org" to="user@chat.example.org/resource">
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10 <apply-to xmlns="urn:xmpp:fasten:0" id="origin-id-X">
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11 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:title" content="The Rock"/>
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12 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:url" content="https://www.imdb.com/title/tt0117500/"/>
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13 <meta xmlns="http://www.w3.org/1999/xhtml" property="og:image" content="https://ia.media-imdb.com/images/rock.jpg"/>
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14 </apply-to>
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15 </message>
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16 ```
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17
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18 The module is intentionally simple in the sense that it is basically a transport for https://ogp.me/
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19
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20 Configuration
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21 -------------
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22
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23 You can present an allowlist or denylist of domains for which OGP metadata will be fetched
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24 via the `ogp_domain_allowlist` and `ogp_domain_denylist` settings repectively.
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25
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26 For example:
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27
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28 ```lua
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29 Component "muc.example.org" "muc"
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30 modules_enabled = { "ogp" }
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31 ogp_domain_allowlist = { "prosody.im" }
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32 ```