annotate doc/components.rst @ 3732:0fac164ff2d8

tools (xml_tools): fix `widget_args` modification in `_dataFormField2XMLUIData`: in `textbox` widget, the first arg was modified with all values, lettings other ones unchanger, resulting in invalid number of arguments. This has been fixed by replacing all args with the new value.
author Goffi <goffi@goffi.org>
date Mon, 31 Jan 2022 18:35:52 +0100
parents a1eff4e32848
children 643622ff1492
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1 .. _components:
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2
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3 ===================
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4 Libervia Components
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5 ===================
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6
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7 Libervia can act as an XMPP server component, which can be seen as a generic plugin for
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8 XMPP servers.
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9
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10 This page explains which components are available and how to use them.
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11
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12 Running a component
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13 ===================
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14
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15 Components are linked to a Libervia profile in the same way as normal clients.
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16
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17 To run a component, you'll need to know its *entry point*, which is the name of the import
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18 name of plugin managing it. The entry point to use will be specified in the component
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19 installation documentation.
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20
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21 You'll also have to declare the component on your XMPP server, this is a server dependent
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22 step and you'll have to check your server documentation for details. You'll have to
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23 specify a **shared secret** (can also be named simply *password*) that must be set both on
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24 the XMPP server and as the XMPP password of the Libervia profile.
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25
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26 Here is a list of relevant documentation for most common servers:
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27
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28 ejabberd
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29 https://docs.ejabberd.im/admin/configuration/listen-options/
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30
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31 MongooseIm
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32 https://esl.github.io/MongooseDocs/latest/configuration/listen/#xmpp-components-listenservice
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33
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34 OpenFire
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35 use the web-based admin panel
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36
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37 Prosody
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38 https://prosody.im/doc/components
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39
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40 Tigase
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41 https://docs.tigase.net/tigase-server/stable-snapshot/Administration_Guide/webhelp/externalComponentConfiguration.html
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42
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43
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44 On Libervia, setup is done with Libervia CLI's :ref:`profile create <li_profile_create>`
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45 command.
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46
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47 You'll usually want to have the component to start automatically when the backend
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48 is started, for this you must unset the profile password (not to be confused with the XMPP
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49 password which is the one also set on the server configuration) with ``-p ""`` and set
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50 auto-connection with ``-A``.
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51
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52 You'll specify the XMPP password (also named *shared secret* in `XEP-0144`_ terminology)
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53 with ``-x <your_shared_secret>`` and the JID to use with ``-j
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54 <component_subdomain>.<server.tld>``.
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55
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56 The component entry point is specified with ``-C <entry_point>``.
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57
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58 .. _XEP-0144: https://xmpp.org/extensions/xep-0114.html
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59
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60 example
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61 -------
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62
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63 Louise wants to run an ActivityPub gateway on her server ``example.org`` with the JID
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64 ``ap.example.org``. The shared secret is ``xmpp_rocks`` and she wants the component to
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65 start automatically with the backend, thus she doesn't set a profile password. The
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66 entry-point for ActivityPub component is ``ap-gateway``, and she wants to use the same
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67 name for the profile. To do this, she enters the following command::
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68
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69 $ li profile create ap-gateway -j ap.example.org -p "" -x xmpp_rocks -C ap-gateway -A
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70
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71 The component will then be started next time Libervia Backend is launched. If Louise
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72 wants to connect it immediately, she can use::
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73
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74 $ li profile connect -cp ap-gateway
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75
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76 Available Components
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77 ====================
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78
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79 Below is a list of currently available components in Libervia, and instructions on what
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80 they do and how to use them.
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81
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82
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83 File Sharing
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84 ------------
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85
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86 **entry_point:** ``file-sharing``
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87
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88 File Sharing component manage the hosting of user files. Users can upload file there using
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89 either `Jingle File Transfer`_ or `HTTP File Upload`_.
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90
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91 There is no limit to the size of files which can be uploaded, but administrators can set a
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92 quota to limit the space that can be used.
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93
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94 Files can be retrieved using `File Information Sharing`_, and deleted using `Ad-Hoc Commands`_.
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95
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96 Files can be shared with a public HTTP link, or made available only to a specified list of
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97 entities (JIDs). Permissions can be set through Ad-Hoc Commands.
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98
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99 .. _Jingle File Transfer: https://xmpp.org/extensions/
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100 .. _HTTP File Upload: https://xmpp.org/extensions/xep-0363.html
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101 .. _File Information Sharing: https://xmpp.org/extensions/xep-0329.html
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102 .. _Ad-Hoc Commands: https://xmpp.org/extensions/xep-0050.html
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103
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104 Configuration
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105 ~~~~~~~~~~~~~
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106
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107 All options are to be set in ``[component file-sharing]`` section.
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108
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109 ``http_upload_port``
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110 port to use for HTTP File Upload
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111
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112 **default**: 8888
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113
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114 ``http_upload_connection_type``
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115 either ``http`` or ``https``.
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116
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117 **default**: ``https``
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118
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119 Note that HTTP Upload should always be ``https`` to end-user, the ``http`` option is to
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120 be used only if you use a HTTP server as a proxy, and this server is already set for
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121 TLS.
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122
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123 ``http_upload_public_facing_url``
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124 must be set to the URL that end-user will see. Notably useful if the component is behind
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125 a proxy.
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126
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127 **default**: ``https://<component host>:<http_upload_port``
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128
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129 ``quotas_json``
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130 a JSON object indicating quotas to use for users. The object can have 3 keys:
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131
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132 ``admins``
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133 quotas to use for administrators (i.e. profiles set in ``admins_list``)
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134
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135 ``users``
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136 quotas to use for normal users (i.e. non admin profiles)
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137
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138 ``jids``
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139 per-jid specific quotas. The value is a JSON object where key is a user bare jid and
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140 value is a quota.
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141
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142 Quotas can be either ``null`` for unlimited space, or a size value (`SI prefixes and
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143 binary prefixes`_ can be used).
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144
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145 example::
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146
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147 quotas_json = {
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148 "admins": null,
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149 "users": "50 Mio",
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150 "jids": {"pierre@example.org": "1 Gio"}
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151 }
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152
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153 .. _SI prefixes and binary prefixes: https://en.wikipedia.org/wiki/Octet_(computing)#Unit_multiples
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155
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156 ActivityPub Gateway
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157 -------------------
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158
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159 **entry_point:** ``ap-gateway``
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160
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161 .. note::
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162
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163 this component is currently in active development, and not yet usable for end-user. This
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164 documentation will be updated during evolution of component.
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165
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166 You can follow the development by reading `Libervia Progress Notes`_.
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167
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168 .. _Libervia Progress Notes: https://www.goffi.org/tag/Libervia%20progress
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169
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170 This gateway will provide a bidirectional gateway between XMPP and `ActivityPub`_ (or AP
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171 below). That means that user from XMPP will be able to follow actors or comments messages
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172 from any software compatible with ActivityPub protocol, and vice versa.
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173
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174 .. _ActivityPub: https://activitypub.rocks/
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175
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176 .. note::
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177
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178 this component is mostly tested with Prosody as XMPP server reference, and Mastodon as
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179 AP server reference, but it should work with any XMPP or AP server.
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180
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181 The component launches a HTTP server (necessary to communicate with AP software). This
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182 server needs to handle HTTP requests made at paths ``/.well-known/webfinger`` and ``/_ap``
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183 (or the ``ap_path`` set in configuration, see below). If the component is not directly
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184 facing internet (e.g. integrated in an existing website though a proxy), you'll have to
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185 redirect the requests made to those path to the HTTP server (i.e. to component host at the
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186 port set at ``http_port``, see configuration below). Please check your HTTP server
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187 documentation to find how this must be done.
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188
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189 how to address an AP actor from XMPP
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190 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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191
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192 When addressing an ActivityPub actor from XMPP, you must use a JID corresponding to the
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193 actor. The domain part of the JID correspond to the gateway JID (the one set in gateway
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194 profile), while the local part (before the ``@``) is used to specify the AP actor.
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195
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196 `XEP-0106`_ (JID Escaping) is used to indicate the AP actor identifier, thus the ``@``
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197 must be escaped with ``\40``.
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198
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199 .. _XEP-0106: JID Escaping
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200
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201 **example**
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202
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203 If Louise wants to talk to Pierre which is on the ``example.net`` AP server, she can use
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204 her XMPP AP gateway which is at ``ap.example.org``. Pierre AP's actor identifier is
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205 ``pierre@example.net``, Louise can access it via the JID
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206 ``pierre\40example.net@ap.example.org``.
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207
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208 Of course, this is a bit cumbersome to do by hand, it is expected that XMPP clients will
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209 do the (un)escaping automatically for end-user, in a way that Louise could enter
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210 ``pierre@example.net`` directly, with an indicator to show that this is an ActivityPub
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211 actor identifier rather than an XMPP JID.
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212
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213 how to address an XMPP entity from AP
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214 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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215
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216 To access an XMPP entity, just use its bare JID as AP actor.
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217
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218 **example**
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219
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220 If Pierre wants to talk Louise, he can directly use the JID which is the same as the AP
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221 actor identifier, i.e. ``louise@example.org`` (note that on AP software, a ``@`` prefix is
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222 often required, thus Pierre will look for ``@louise@example.org``).
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223
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224 .. note::
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225
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226 Currently the gateway only uses bare JID, and character set must be recognised by the
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227 AP software to be used. This will evolve in the close future to have a way to access
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228 various XMPP Pubsub nodes.
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229
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230 The actor endpoint can also be used directly in AP software (in the example above, it
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231 would be by default ``https://example.org/_ap/actor/louise%40example.org``).
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232
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233
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234 using the component
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235 ~~~~~~~~~~~~~~~~~~~
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236
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237 The component is currently only usable for development purpose, and it can be used with
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238 the following method (with can be accessed through the ``APSend`` bridge method, client is
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239 then replaced by the ``profile`` name, as last argument):
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240
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241 .. automethod:: sat.plugins.plugin_comp_ap_gateway.APGateway.publishMessage
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242
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243 The method can be used either with CLI's :ref:`debug bridge method
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244 <li_debug_bridge_method>` or with any D-Bus tool like ``qdbus`` or ``d-feet`` (only if you
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245 use the D-Bus bridge).
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246
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247 example
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248 ~~~~~~~
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249
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250 On its ``example.net`` Mastodon instance, Pierre has published a message with the id
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251 ``https://example.net/@pierre/106986412193109832``. To send a reply to this message,
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252 Louise can use the following command::
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253
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254 $ li debug bridge method -c APSend '"{\"node\": \"https://example.net/@pierre/106986412193109832\", \"content\": \"A lille hello from XMPP\"}","pierre\\40example.net@ap.example.org", "louise"'
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255
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256 Note the double escaping, one for the shell argument, and the other to specify JSON
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257 object.