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component AP: convert AP identity data to XMPP: metadata are converted to vCard4 (XEP-0292). Avatar is converted to User Avatar (XEP-0084), it is downloaded, resized, converted and cached on first request. If avatar is bigger than 5 Mio, it won't be used. rel 368
author Goffi <goffi@goffi.org>
date Wed, 29 Jun 2022 12:12:09 +0200
parents 29380ef68dbe
children 23b53ac87e0f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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154
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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 fully functional. 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
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190 Configuration
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191 ~~~~~~~~~~~~~
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192
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193 All options are to be set in ``[component ap-gateway]`` section.
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194
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195 ``public_url``
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196 Main user-facing domain of the HTTP server, this will be used to construct all AP URLs
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197
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198 **default**: if not set, ``xmpp_domain`` is used. If ``xmpp_domain`` is not set either,
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199 an error is raised.
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200
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201 ``http_port``
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202 port where the HTTP server should listen. Port ``80`` is not used directly as it would
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203 require root privileges, and it is strongly recommended against launching Libervia under
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204 a privileged account. An HTTP Proxy or a port redirection should be set to redirect the
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205 ``80`` port to the port specified here.
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206
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207 **default**: ``8123``
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208
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209 ``http_connection_type``
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210 either ``http`` or ``https``. If you have a HTTP proxy such as Apache or NGINX which
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211 already handles HTTPS, you may want to use ``http``.
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212
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213 **default**: ``https``
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214
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215 Note that the HTTP server should always use ``https`` with end-user, the ``http`` option
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216 is only to be used with an HTTPS proxy.
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217
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218 ``local_only``
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219 A boolean value indicating if the gateway is allowed to convert pubsub node from
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220 external XMPP service or not. A JID is considered external if its domain part doesn't
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221 end with the gateway's server. For instance, if a gateway ``ap.example.org`` is set on
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222 the server ``example.org``, the JIDs ``pierre@example.org`` or
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223 ``some-node@pubsub.example.org`` will be considered local, but
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224 ``buenaventura@example.net`` won't (note the different domain).
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225
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226 Most of time, ``local_only`` should be used.
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227
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228 **default**: ``true``
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229
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230 ``ap_path``
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231 Path prefix to use for ActivityPub request. It's usually not necessary to change the
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232 default value.
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233
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234 **default**: ``_ap``
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235
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236 ``comments_max_depth``
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237 An integer value indicating the maximum number of comment nodes that can be created. See
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238 :ref:`ap-xmpp-threads-conversion`
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239
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240
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241 .. _ap-actor-from-xmpp:
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242
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243 How to Address an AP Actor from XMPP
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244 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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245
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246 When addressing an ActivityPub actor from XMPP, you must use a JID corresponding to the
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247 actor. The domain part of the JID correspond to the gateway JID (the one set in gateway
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248 profile), while the local part (before the ``@``) is used to specify the AP actor.
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249
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250 `XEP-0106`_ (JID Escaping) is used to indicate the AP actor identifier, thus the ``@``
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251 must be escaped with ``\40``.
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252
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253 .. _XEP-0106: JID Escaping
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254
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255 **example**
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256
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257 If Louise wants to talk to Pierre which is on the ``example.net`` AP server, she can use
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258 her XMPP AP gateway which is at ``ap.example.org``. Pierre AP's actor identifier is
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259 ``pierre@example.net``, Louise can access it via the JID
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260 ``pierre\40example.net@ap.example.org`` (we call it *virtual JID* of the AP actor).
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261
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262 Of course, this is a bit cumbersome to do by hand, it is expected that XMPP clients will
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263 do the (un)escaping automatically for end-user, in a way that Louise could enter
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264 ``pierre@example.net`` directly, with an indicator to show that this is an ActivityPub
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265 actor identifier rather than an XMPP JID.
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266
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267
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268 .. _xmpp-node-from-ap:
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269
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270 How to Address an XMPP Entity from AP
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271 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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272
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273 To access an XMPP entity, it is a little bit more complicated for 2 reasons:
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274
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275 - XMPP use a wider range of allowed characters than most AP implementations [#AP_chars]_.
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276 - to get XMPP items, we need 2 data: the entity JID, and a pubsub node
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277
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278
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279 However, Libervia AP gateway tries to make it as user friendly as possible, thus it works
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280 like this:
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281
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282 - in the most common case, one just wants to access the personal blog of a user, and basic
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283 ASCII characters (with possibly ``-``, ``_`` or ``.``) are used. in this case, the XMPP
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284 JID can be directly used as AP actor handle
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285 - when a pubsub node needs to be specified it is most of time with a pubsub JID which has
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286 not user part (something like ``pubsub.example.org``). In this case, the pubsub node can
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287 be used as AP actor handle's user part, Libervia will use XMPP discovery to know that
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288 it's a pubsub service. So if you want to access the blog named ``xmpp_news`` at
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289 ``pubsub.example.org``, you can use the handle ``xmpp_news@pubsub.example.org`` (be sure
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290 that the domain ``pubsub.example.org`` links to the Libervia AP gateway HTTP server)
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291 - if you want to use a specific node with an entity which already has a user part, then a
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292 special encoding must be used, where ``---`` (three dashes) are used to separate node
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293 from entity: ``some_node--some_user@example.org``
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294 - if you need to use special characters, then you'll have to use ``___`` followed by the
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295 special encoding (see below).
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296
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297 The encoding is explained in the documentation of the following method:
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298
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299 .. automethod:: sat.plugins.plugin_comp_ap_gateway.APGateway.getJIDAndNode
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300
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301
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302 .. [#AP_chars] Most if not all AP implementations use webfinger `acct` URI as a de-facto
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303 standard to manage user-friendly handles (something like ``user@example.org``). Those
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304 handles, according to `RFC7565`_, should
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305 manage a wide variety of characters thanks to the support of percent-encoding.
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306
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307 Unfortunately, at least one of the most-used AP implementation (Mastodon, which is used
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308 a reference implementation for this gateway), only uses a limited subset of allowed
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309 characters. In addition, Mastodon needs an associated handle [#m_wf]_ thus an alternate
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310 way to encode characters had to be found.
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311
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312 An issue has been opened to improve this situation on Mastodon bug tracker:
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313 https://github.com/mastodon/mastodon/issues/17222
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314
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315 .. _RFC7565: https://datatracker.ietf.org/doc/html/rfc7565
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316 .. [#m_wf] https://docs.joinmastodon.org/spec/webfinger/
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317
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318 **example**
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319
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320 If Pierre wants to talk to Louise, he can directly use the JID which is the same as the AP
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321 actor identifier, i.e. ``louise@example.org`` (note that on AP software, a ``@`` prefix is
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322 often required, thus Pierre will look for ``@louise@example.org``).
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323
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324 .. note::
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325
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326 The actor endpoint can also be used directly in AP software (in the example above, it
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327 would be by default ``https://example.org/_ap/actor/louise%40example.org``).
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328
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329
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330 Getting AP Message from XMPP
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331 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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332
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333 To retrieve ActivityPub messages of an actor from an XMPP client with blogging
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334 capabilities (like Libervia or Movim), just use the associated JID as explained in
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335 :ref:`ap-actor-from-xmpp`. The actor messages (from ``outbox`` collection) should appear
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336 as regular XMPP blog items.
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337
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338 .. note::
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339
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340 Due to limitation of `ActivityStream Collection Paging`_, the conversion from XMPP
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341 `RSM`_ requests is inneficient beyond first or last page. This problem is avoided if
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342 anybody subscribe to the gateway node (i.e. follow the AP actor), as the collection
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343 will then be cached, and efficiently delivered.
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344
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345 .. _ActivityStream Collection Paging: https://www.w3.org/TR/activitystreams-core/#h-paging
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346 .. _RSM: https://xmpp.org/extensions/xep-0059.html
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347
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348 Getting XMPP Items from ActivityPub
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349 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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350
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351 To get XMPP items from an ActivityPub implementation, just use the handle as explained at
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352 :ref:`xmpp-node-from-ap` (often handle searches are triggered with a ``@`` before the
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353 handle in AP implementations, e.g.: ``@louise@example.org``).
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354
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355 .. note::
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356
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357 Some AP implementations such as Mastodon don't retrieve existing items, but only keep
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358 new ones once an actor is followed. That means that you won't see any message published
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359 before your entity is followed. Other implementations may work differently.
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360
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361
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362 .. _ap-xmpp-threads-conversion:
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363
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364 ActivyPub to XMPP Discussion Threads Conversion
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365 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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366
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367 By default, each (micro)blog publication converted from ActivityPub to XMPP Pubsub is
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368 associated with a comment node (see `XEP-0277 comments`_) to allow user to post a reply on
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369 any on them. This result in a "tree-like" comments threading model, which is similar to
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370 what you can see on popular website such as Reddit, Hacker News, or LinuxFr.
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371
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372 However, some XMPP clients may not play nicely with this kind of threading model. To work
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373 around this, the ``comments_max_depth`` option allows to limit the maximum number of
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374 thread. It is an integer value which indicate how many comments nodes may exist for a root
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375 post. If set to ``1``, only one comment node will be made, and ActivityPub items below
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376 this level will be moved to this single XMPP pubsub comment node.
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377
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378 The default value of ``0`` means unlimited max depth.
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379
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380 An example can probably make it more clear. Imagine that you have a message ``root
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381 message``, with a comment to it named ``1``, a comment to ``1`` named ``2`` and so on
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382 until ``5``. With ``comments_max_depth`` set to ``0``, you'll have one comment node per
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383 item, resulting in following threads model::
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384
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385 root message ┑
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386 ┕ 1 ┑
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387 ┕ 2 ┑
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388 ┕ 3 ┑
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389 ┕ 4 ┑
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390 ┕ 5
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391
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392 With ``comments_max_depth`` set to ``2``, only 2 nodes will be created, and items below
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393 depth ``2`` will be put on the same level::
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394
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395 root message ┑
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396 ┕ 1 ┑
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397 ┝ 2
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398 ┝ 3
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399 ┝ 4
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400 ┕ 5
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401
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402 This way, admins can configure the model which suits best the clients which is expected to
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403 be mainly used on the instance.
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404
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405 .. _XEP-0277 comments: https://xmpp.org/extensions/xep-0277.html#comments
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406
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407 Publishing an Item
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408 ~~~~~~~~~~~~~~~~~~
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409
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410 To publish a new item (e.g. a blog post), you just need to publish normally on your own
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411 PEP/pubsub node, AP actors following you will be notified. To reply to an AP item, just
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412 publish to the corresponding pubsub node managed by the gateway. This is transparent for
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413 AP and XMPP end users.
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414
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415 For instance, if Pierre has posted an interesting message on his AP server, and Louise
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416 wants to reply to it, she just use a client to reply on the comments node of this message,
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417 this will be delivered as an AP object to Pierre's AP server.
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418
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419 On the other hand, if Louise is publishing a new blog post on her XMPP server, Pierre will
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420 receive corresponding AP object because he's following her. If Pierre answer using his AP
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421 client, the corresponding message will be published on the comments node of the message
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422 that Louise has initially published.
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423
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424 Following, Subscribing and Cache
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425 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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426
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427 When you try to access an uncached AP collection from XMPP (e.g. blog posts), a best
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428 effort is done to translate XMPP pagination (which uses `XEP-0059 (Result Set
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429 Management)`_) to the less powerful `AP Collection Paging`_. This is inefficient due to
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430 technical limitations (page size can't be specified in AP, there is not standard way to
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431 request item after or before a specific ID, implementations may not implement reverse
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432 pagination).
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433
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434 That's one of the reason why whenever possible, collections are cached locally. Once
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435 cached, it's easier to return items according to complex requests.
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436
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437 However, to cache correctly an AP collection, you need to keep it in sync, and thus to
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438 receive update when something change (e.g. a new blog item is published).
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439
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440 In AP, this is done by following an actor, in XMPP this correspond to a node subscription.
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441
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442 When you subscribe to a blog node managed by this gateway, this will be translated to a
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443 *follow* activity on AP side, and vice versa.
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444
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445 When an AP actor is followed, its *outbox* collection (i.e. message published), are
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446 automatically cached, and will be updated when events will be received. That means that
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447 you can use pubsub cache search on followed actors, e.g. to retrieve all items about a
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448 specific topic or published at specific time range.
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449
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450 Reciprocally, unsubscribing from a node will *unfollow* the corresponding AP actor.
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451
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452 If an AP actor is following or unfollowing an actor mapping an XMPP entity, they nodes
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453 will be subscribed to or unsubscribed from.
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454
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455 All subscriptions are made public as specified by `XEP-0465 (Pubsub Public Subscriptions)`_.
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456
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457 .. _XEP-0059 (Result Set Management): https://xmpp.org/extensions/xep-0059.html
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458 .. _AP Collection Paging: https://www.w3.org/TR/activitystreams-core/#h-paging
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459 .. _XEP-0465 (Pubsub Public Subscriptions): https://xmpp.org/extensions/inbox/pubsub-public-subscriptions.html
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460
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461 Following/Followers Collections and Public Pubsub Subscription
98ba02637436 doc (components): update AP gateway documentation:
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462 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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463
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464 The AP *following* collection is mapped to `XEP-0465 (Pubsub Public Subscriptions)`_.
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465
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466 In the same spirit, the AP *followers* collection correspond to public subscribers to the
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467 microblog node.
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468
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469 Because AP doesn't send any event when *following* or *followers* collections are
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470 modified, those collections can't be cached, and thus the translation to public pubsub
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471 subscriptions is done as best as possible given the constraints.
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472
3810
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473 .. _ap-message_delivery:
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474
3786
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475 Messages Delivery
cebfdfff3e99 doc (components): message delivery documentation:
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476 ~~~~~~~~~~~~~~~~~
cebfdfff3e99 doc (components): message delivery documentation:
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477
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478 The gateway can convert AP publications to either XMPP pubsub items (using `XEP-0277
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479 (Microblogging over XMPP)`_ when suitable) or to XMPP messages (`<message>` stanzas, i.e.
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480 the ones used for instant messaging). Of course it also converts in a similar way in the
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481 other direction (XMPP → ActivityPub).
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482
3790
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483 A received AP item will be converted to an XMPP pubsub item if any of the following
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484 conditions is fulfilled:
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485
cebfdfff3e99 doc (components): message delivery documentation:
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486 - it is addressed to the special `*public* collection`_
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487 - it is addressed to a local *followers* collection
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488
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489 A received AP item will be converted to an XMPP message if all the following conditions
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490 are fulfilled:
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491
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492 - it is **not** addressed to the special *public* collection
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493 - it is **not** addressed to a any local *followers* collection.
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494
3790
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495 In other words, if an AP item is addressed directly to one or more local users, is not
3786
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496 public and is not addressed to a *followers* collection, it will be converted to an XMPP
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497 message, otherwise it will be converted to an XMPP pubsub item.
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498
cebfdfff3e99 doc (components): message delivery documentation:
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499 The behaviour is symmetric, thus if you send an XMPP message it will be converted to an AP
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500 item which will be only addressed to your recipient. If you write using XMPP pubsub, the
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501 suitable followers collections of the target AP actor will be automatically added, and the
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502 item will have the special *public* collection added.
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503
cebfdfff3e99 doc (components): message delivery documentation:
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504 .. note::
cebfdfff3e99 doc (components): message delivery documentation:
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505
cebfdfff3e99 doc (components): message delivery documentation:
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506 ActivyPub doesn't do any kind of `end-to-end encryption`_, it is **not** the same level of
cebfdfff3e99 doc (components): message delivery documentation:
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507 privacy as XMPP.
cebfdfff3e99 doc (components): message delivery documentation:
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508
cebfdfff3e99 doc (components): message delivery documentation:
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509 Messages will be at minimum readable by the administrators of the AP gateway and of the
cebfdfff3e99 doc (components): message delivery documentation:
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510 ActivyPub server of the destinee. Be sure to understand that before sending messages.
cebfdfff3e99 doc (components): message delivery documentation:
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511
cebfdfff3e99 doc (components): message delivery documentation:
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512 If you need more privacy, you need to use either XMPP only (without the ActivityPub
cebfdfff3e99 doc (components): message delivery documentation:
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513 gateway) with clients implementing correctly end-to-end encryption, or an other
cebfdfff3e99 doc (components): message delivery documentation:
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514 software. Depending of the level of pricacy required, you may want to use
cebfdfff3e99 doc (components): message delivery documentation:
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515 authentication by a separated channel, a client which has been audited, encryption by
cebfdfff3e99 doc (components): message delivery documentation:
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516 default, etc. This is beyond the scope of this AP gateway documentation.
cebfdfff3e99 doc (components): message delivery documentation:
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517
cebfdfff3e99 doc (components): message delivery documentation:
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518 In short, don't use ActivityPub if you need a high level of privacy. This is a current
cebfdfff3e99 doc (components): message delivery documentation:
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519 protocol limitation, and there is nothing that this gateway can do about this until
cebfdfff3e99 doc (components): message delivery documentation:
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520 ActivityPub and its implementations evolve.
cebfdfff3e99 doc (components): message delivery documentation:
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521
cebfdfff3e99 doc (components): message delivery documentation:
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522 .. _XEP-0277 (Microblogging over XMPP): https://xmpp.org/extensions/xep-0277.html
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523 .. _*public* collection: https://www.w3.org/TR/activitypub/#public-addressing
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524 .. _end-to-end encryption: https://en.wikipedia.org/wiki/End-to-end_encryption
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diff changeset
525
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526 Message/Item Retraction
29380ef68dbe doc (components): AP item retraction + blocking:
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parents: 3790
diff changeset
527 ~~~~~~~~~~~~~~~~~~~~~~~
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
528
29380ef68dbe doc (components): AP item retraction + blocking:
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529 If you retract a pubsub item (e.g. a blog post), that is followed by ActivityPub actors,
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diff changeset
530 a suitable `Delete` activity will be emitted. In other words, the ActivityPub servers will
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diff changeset
531 be notified of the retraction.
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
532
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
533 Similarly if an AP actor is deleting an item, a suitable `XEP-0060 retraction event`_ will
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diff changeset
534 be sent to subscribers.
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
535
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
536 In the case of direct messages (see :ref:`ap-message_delivery`), `XEP-0424 (Message
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537 Retraction)`_ is used in both reception (AP ``Delete`` activity is converted to XEP-0424
29380ef68dbe doc (components): AP item retraction + blocking:
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538 and vice versa).
29380ef68dbe doc (components): AP item retraction + blocking:
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539
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diff changeset
540 All of this should be transparent to users as long as their clients support the mentioned
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diff changeset
541 XEPs.
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parents: 3790
diff changeset
542
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
543 .. note::
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
544
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
545 When retracting a message/item, a retraction request (or equivalent AP "Delete"
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
546 activity) is sent, so the other end clients **may** delete the item.
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
547
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
548 However, there is no way to be sure that the item will be actually deleted: once
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diff changeset
549 something is sent on the network, any recipient can see it, copy it, share it, etc.
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diff changeset
550 There is no way to forbid that, and this is true for software, decentralized or not
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Goffi <goffi@goffi.org>
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diff changeset
551 (and not only ActivityPub or XMPP).
29380ef68dbe doc (components): AP item retraction + blocking:
Goffi <goffi@goffi.org>
parents: 3790
diff changeset
552
29380ef68dbe doc (components): AP item retraction + blocking:
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parents: 3790
diff changeset
553 Be sure to understand that before sending anything sensitive.
29380ef68dbe doc (components): AP item retraction + blocking:
Goffi <goffi@goffi.org>
parents: 3790
diff changeset
554
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
555 .. note::
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
556
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
557 When deleting an item on ActivityPub, the item is often replaced by a "tombstone", and
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
558 it's not possible to send a new item with the same ID. Some software (it's at least the
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
559 case with Mastodon), will silently reject the item, and thus people won't see it.
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
560
29380ef68dbe doc (components): AP item retraction + blocking:
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parents: 3790
diff changeset
561 This is a different behaviour from XMPP where you can publish a pubsub item, retract
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parents: 3790
diff changeset
562 it, and publish a new item with the same ID.
29380ef68dbe doc (components): AP item retraction + blocking:
Goffi <goffi@goffi.org>
parents: 3790
diff changeset
563
29380ef68dbe doc (components): AP item retraction + blocking:
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diff changeset
564 Thus if you retract an item, be sure to publish any new one with new and unique ID,
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parents: 3790
diff changeset
565 otherwise the item may not appear to ActivityPub users (and as the item may be rejected
29380ef68dbe doc (components): AP item retraction + blocking:
Goffi <goffi@goffi.org>
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diff changeset
566 silently, you may not be notified).
29380ef68dbe doc (components): AP item retraction + blocking:
Goffi <goffi@goffi.org>
parents: 3790
diff changeset
567
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568 However this should not be a problem in the vast majority of cases, as most XMPP client
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569 implementing pubsub or pubsub service will generate automatically unique IDs for new
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570 items.
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571
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572 .. _XEP-0060 retraction event: https://xmpp.org/extensions/xep-0060.html#publisher-delete
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573 .. _XEP-0424 (Message Retraction): https://xmpp.org/extensions/xep-0424.html
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574
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575 Blocking an User
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576 ~~~~~~~~~~~~~~~~
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577
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578 You can block AP actors using :ref:`its virtual JID <ap-actor-from-xmpp>` in the same way
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579 as for any XMPP entity, by using `XEP-0191 (Blocking Command)`_.
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580
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581 This is done at the XMPP server level and your server must support it. From client side,
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582 many clients support it, and you can use Libervia CLI to do it from command-line (see
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583 :ref:`libervia-cli_blocking`).
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584
29380ef68dbe doc (components): AP item retraction + blocking:
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585 .. _XEP-0191 (Blocking Command): https://xmpp.org/extensions/xep-0191.html
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586
3734
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587 Using the Component (for developers)
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588 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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589
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590 Publication of AP items can be tested using the following method (with can be accessed
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591 through the ``APSend`` bridge method, client is then replaced by the ``profile`` name, as
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592 last argument):
3683
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593
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594 .. automethod:: sat.plugins.plugin_comp_ap_gateway.APGateway.publishMessage
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595
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596 The method can be used either with CLI's :ref:`debug bridge method
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597 <li_debug_bridge_method>` or with any D-Bus tool like ``qdbus`` or ``d-feet`` (only if you
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598 use the D-Bus bridge).
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599
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600 example
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601 ~~~~~~~
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602
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603 On its ``example.net`` Mastodon instance, Pierre has published a message with the id
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604 ``https://example.net/@pierre/106986412193109832``. To send a reply to this message,
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605 Louise can use the following command::
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606
a1eff4e32848 doc (components): base documentation for AP Gateway:
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607 $ 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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608
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609 Note the double escaping, one for the shell argument, and the other to specify JSON
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610 object.