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annotate mod_ogp/README.markdown @ 4522:08b71d02c6dc

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mod_pubsub_post: Allow specifying item id by a special mapping If `{http://jabber.org/protocol/pubsub}id` exists as an attribute at the top level then it is used, otherwise the previous behavior (.id if string)
author Kim Alvefur <zash@zash.se>
date Mon, 22 Mar 2021 21:20:03 +0100
parents 2c4b65bfac62
children c858c76d0845
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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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4
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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="chatroom@muc.example.org">
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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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23 You can present a whitelist of domains for which OGP metadata will be fetched
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24 via the `ogp_domain_whitelist` setting.
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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_whitelist = { "prosody.im" }
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32 ```