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annotate mod_ogp/README.markdown @ 4700:f821eeac0e50

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mod_pastebin: Fix pasting when <body> is not the first tag (thanks thorsten) Introduced in ded630a87563 stanza:get_child() and :get_child_text() operates on the first child when no name or namespace is given. If it so happens that the first child is an <thread/> instead of <body> then it calculates the line length against that instead of the body. Apparently in the vast majority of clients the <body> is first, so this issue was not noticed until now.
author Kim Alvefur <zash@zash.se>
date Wed, 29 Sep 2021 13:39:59 +0200
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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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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7
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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 ```