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mod_restrict_xmpp: XMPP-layer access control using Prosody's permissions API
author Matthew Wild <mwild1@gmail.com>
date Mon, 22 Aug 2022 20:03:23 +0100
parents 4bba01ce2f98
children
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1 ---
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2 labels:
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3 - Stage-Stable
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4 summary: Redirect long messages to built-in pastebin
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5 ---
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7 # Introduction
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8
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9 Pastebins are used very often in IM, especially in chat rooms. You have
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10 a long log or command output which you need to send to someone over IM,
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11 and don't want to fill their message window with it. Put it on a
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12 pastebin site, and give them the URL instead, simple.
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14 Not for everyone... no matter how hard you try, people will be unaware,
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15 or not care. They may also be too lazy to visit a pastebin. This is
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16 where mod_pastebin comes in!
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18 # Details
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19
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20 When someone posts to a room a "large" (the actual limit is
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21 configurable) message, Prosody will intercept the message and convert it
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22 to a URL pointing to a built-in pastebin server. The URLs are randomly
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23 generated, so they can be considered for most purposes to be private,
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24 and cannot be discovered by people who are not in the room.
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26 # Usage
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28 To set up mod_pastebin for MUC rooms it **must** be explicitly loaded,
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29 as in the example below - it won't work when loaded globally, as that
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30 will only load it onto normal virtual hosts.
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31
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32 For example:
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33
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34 Component "conference.example.com" "muc"
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35 modules_enabled = { "pastebin" }
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36
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37 Pastes will be available by default at
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38 `http://<your-prosody>:5280/pastebin/` by default.
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39
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40 In Prosody 0.9 and later this can be changed with [HTTP
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41 settings](https://prosody.im/doc/http).
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43 In 0.8 and older this can be changed with `pastebin_ports` (see below),
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44 or you can forward another external URL from your web server to Prosody,
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45 use `pastebin_url` to set that URL.
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46
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47 # Discovery
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49 The line and character tresholds are advertised in
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50 [service discovery][xep-0030] like this:
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51
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52 ``` {.xml}
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53 <iq id="791d37e8-86d8-45df-adc2-9bcb17c45cb7" type="result" xml:lang="en" from="prosody@conference.prosody.im">
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54 <query xmlns="http://jabber.org/protocol/disco#info">
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55 <identity type="text" name="Prosŏdy IM Chatroom" category="conference"/>
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56 <feature var="http://jabber.org/protocol/muc"/>
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57 <feature var="https://modules.prosody.im/mod_pastebin"/>
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58 <x xmlns="jabber:x:data" type="result">
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59 <field type="hidden" var="FORM_TYPE">
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60 <value>http://jabber.org/protocol/muc#roominfo</value>
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61 </field>
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62 <field label="Title" type="text-single" var="muc#roomconfig_roomname">
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63 <value>Prosŏdy IM Chatroom</value>
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64 </field>
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65 <!-- etc... -->
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66 <field type="text-single" var="{https://modules.prosody.im/mod_pastebin}max_lines">
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67 <value>12</value>
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68 </field>
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69 <field type="text-single" var="{https://modules.prosody.im/mod_pastebin}max_characters">
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70 <value>1584</value>
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71 </field>
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72 </x>
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73 </query>
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74 </iq>
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75 ```
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76
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77 # Configuration
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78
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79 Option Description
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80 ------------------------- -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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81 pastebin_threshold Maximum length (in characters) of a message that is allowed to skip the pastebin. (default 500 characters)
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82 pastebin_line_threshold The maximum number of lines a message may have before it is sent to the pastebin. (default 4 lines)
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83 pastebin_trigger A string of characters (e.g. "!paste ") which if detected at the start of a message, always sends the message to the pastebin, regardless of length. (default: not set)
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84 pastebin_expire_after Number of hours after which to expire (remove) a paste, defaults to 24. Set to 0 to store pastes permanently on disk.
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85 pastebin_ports List of ports to run the HTTP server on, same format as mod_httpserver's http_ports[^1]
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86 pastebin_url Base URL to display for pastebin links, must end with / and redirect to Prosody's built-in HTTP server[^2]
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87
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88 # Compatibility
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89
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90 ------ -------
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91 0.11 Works
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92 0.10 Works
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93 0.9 Works
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94 0.8 Works
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95 ------ -------
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97 # Todo
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98
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99 - Maximum paste length
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100 - Web interface to submit pastes?
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101
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102 [^1]: As of Prosody 0.9, `pastebin_ports` is replaced by `http_ports`,
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103 see [Prosody HTTP server documentation](https://prosody.im/doc/http)
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104
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105 [^2]: See also
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106 [http_external_url](https://prosody.im/doc/http#external_url)