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doc (configuration): add `pubsub_cache_strategy` option
author Goffi <goffi@goffi.org>
date Thu, 29 Jul 2021 22:51:01 +0200
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children 7fe1028acab2
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1 ========
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2 Overview
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3 ========
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4
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5 To have a better understanding of Libervia, this page gives a global view of what it is
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6 and what are the important concepts linked to it. You don't need to read this to use it, but you
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7 can if you wish to understand "who is doing what".
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8
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9 Libervia is a XMPP client. `XMPP`_ is an open standard used for communication (notably
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10 instant messaging but not only). XMPP is a solid standard, which is decentralised and
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11 federated.
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12
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13 Libervia is not only focusing on instant messaging, and aims to be a universal communication
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14 tools. In other words, you can use Libervia to chat, but also to blog publicly or privately, to
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15 share file, photo albums, to create events, to have discussion forum, etc.
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16
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17 Libervia is actually a whole ecosystem, and is made in a way that you can use it with many
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18 different interfaces (or "frontends"). There is a common central part which is called the
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19 "backend", it handles most of the work, while frontends are mostly about the interactions
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20 with user(s).
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22 To work, as Libervia is a XMPP **client**, a XMPP **server** is needed. You can either run your
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23 own, or use an existing one (either public, or run by an organisation you belong to, like
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24 family server, run by a friend, your company, university, association, etc.). If you want
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25 to run your own server, there are already plenty of them and happily most of which are
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26 `libre <https://en.wikipedia.org/wiki/Free_software>`_, you can check an `up-to-date list
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27 on the XSF website <https://xmpp.org/software/servers.html>`_ (the XSF or *XMPP Standards
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28 Foundation* being the non-profit organisation taking care of the XMPP standard).
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29
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30 So to summarise, Libervia is a communication ecosystem. Technically, it is a **XMPP
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31 client** which connect to an **XMPP server**. Libervia itself works with a **backend** and
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32 one or many **frontends**.
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33
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34 .. _XMPP: https://xmpp.org
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35
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37 Backend
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38 =======
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39
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40 The backend is a daemon, that means that it's a service running in the background.
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41 It takes its main configuration from a file named ``libervia.conf`` and can be in different
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42 locations (see below). It uses data in a directory called ``local_dir``, and which
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43 default, on suitable platforms, to the corresponding `XDG directory`_, which is most of
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44 time ``~/.local/share/libervia``. In this directory, you'll find the main database in the
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45 ``libervia.db`` file, which is a `SQLite`_ database.
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47 The backend is run and stopped with the ``libervia-backend`` executable. Running it
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48 without argument launch the backend in the background, with ``libervia-backend fg`` you
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49 run it in the foreground (you'll see log directly and can stop the backend with
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50 ``Ctrl + c``). The ``libervia-backend status`` commands help you discover if the backend
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51 is running or stopped.
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52
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53 .. _XDG directory: https://www.freedesktop.org/wiki/Software/xdg-user-dirs/
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54 .. _SQLite: https://sqlite.org
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55
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56 Frontends
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57 =========
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58
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59 Frontends are used to make the interface between user and the backend. Frontends are
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60 adapted to different use cases, and must be started after the backend (if the backend is
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61 not started, you'll see a message telling you so). In most installations, the backend
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62 should be started automatically when you want to use a frontend.
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63
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64 Bellow you'll see a list of the official frontends currently maintained:
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65
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66 Libervia Deskop/Mobile (Cagou)
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67 ------------------------------
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68
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69 Libervia Desktop (alias ``Libervia Mobile`` or ``Cagou``) is the desktop/mobile frontend.
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70 It's probably the main interface for most users. It is based on the `Kivy`_ framework and
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71 should run on most platforms (for now it is officially tested only on GNU/Linux and
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72 Android phones and tablets).
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73
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74 .. _Kivy: https://kivy.org
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75
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76 Libervia Web
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77 ------------
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79 The Web frontend is the second main interface for most users. This frontend has the
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80 particularity to be in 2 parts: a server which serves HTTP content, and a client which
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81 runs in the browser. So you have Libervia server which connect to Libervia backend which itself
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82 connect to the XMPP server, and your browser will connect to Libervia server.
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83
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84 In the browser, you can access the server in two ways: either directly with what we call
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85 **Libervia pages**, or with a JavaScript code in `single-page application`_ which is the
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86 **Libervia client** (or **Libervia web app**) that we have mentioned above.
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87
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88 The **Libervia pages** are web pages managing a single feature. They can work without
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89 JavaScript when it's possible (it's not the case for instant messaging or similar highly
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90 dynamic contents). They aims to be simple and straightforward to use.
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91
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92 The **Libervia client** is a highly dynamic web application, used to access more features.
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93 It's more complete and may be well adapted if you want to let Libervia running in a browser tab
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94 for an extended period.
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95
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96 Last but not least, Libervia is also the central part of the new **web framework** of
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97 Libervia. Indeed, in addition of being a frontend to Libervia features (which is built with
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98 this framework), you can create totally different websites which are integrated in Libervia
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99 (and so XMPP) ecosystem. This framework uses Libervia template engine (based on `Jinja2`_) and
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100 makes the creation of decentralised and federated websites simple. Thanks to this framework,
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101 it's easy to experiment new ideas/features, or to change completely the look and feel of
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102 the Libervia frontend.
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103
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104 The `official Libervia website`_ is made with Libervia web framework.
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105
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106 .. _single-page application: https://en.wikipedia.org/wiki/Single-page_application
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107 .. _Jinja2: http://jinja.pocoo.org/
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108 .. _official Libervia website: https://salut-a-toi.org
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109
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110 Libervia TUI (Primitivus)
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111 -------------------------
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113 Libervia TUI (alias ``Primitivus``) is the Terminal User Interface. In other words, it
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114 works in console and is intended for people at ease with it. Its text only interface has
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115 several advantages: you get rid of many distracting things (like images), it works without
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116 graphical environment installed (which is often the case on servers) and it works on
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117 distant shell (like `ssh`_) while staying gentle with your bandwidth.
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118
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119 Primitivus is shipped with the backend, so it should be always available once Libervia is
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120 installed (but some distributions may provide it separately).
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121
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122 You can check :doc:`Libervia TUI documentation <libervia-tui/index>` for more details.
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123
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124 .. _ssh: https://en.wikipedia.org/wiki/Secure_Shell
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125
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126 Libervia CLI (jp)
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127 -----------------
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128
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129 Libervia CLI (alias ``li`` or ``jp``) is the Command Line Interface. It's a
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130 powerful tool which allows to do nearly everything you can do with other frontends.
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131 Particularly useful if you want to check something quickly, or if you want to do some
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132 automation.
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133
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134 You can check :doc:`Libervia CLI documentation <libervia-cli/index>` documentation for more details.
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135
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136 .. _glossary:
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137
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138 Glossary
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139 ========
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140
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141 While using Libervia you may see some terms or concept. This section explain the most important
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142 ones.
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143
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144 profile
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145 -------
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146
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147 A profile is the name linked to an account data. Usually a profile correspond to an XMPP
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148 account, but you can have several profiles using the same XMPP account (with different
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149 parameters) even if this is not usual.
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150
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151 On a Libervia installation used by a single user, the profiles are usually used for multiple
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152 accounts. On a multi-users installations, there is usually one profile per user.
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153
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154 When you connect to a Libervia frontend, you need to specify a profile and the associated password. The profile password is not the same as the password of the XMPP account. While this may sounds confusing, there are several reason why we use this notion of profile instead of directly the XMPP account/password:
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155
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156 - Libervia needs to know the plain XMPP password to connect, and it is encrypted in database.
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157 The profile password is used to encrypt/decrypt it, this way only a `password hash`_ is
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158 stored and the XMPP password is encrypted `at rest`_.
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159
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160 - As a further benefit, several passwords could be associated to the same profile (this
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161 feature is currently not used in Libervia).
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162
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163 - profile password can be empty, in which case no password is requested when a profile is
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164 used
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165
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166 .. note::
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167
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168 if you use an empty profile password, the XMPP password won't be encrypted in database
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169 (or more precisely, will be trivial to decrypt).
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170
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171 - a profile is a simple name associated with an account, it's easier to remember than a
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172 whole XMPP identifier (also named "JID" for *Jabber ID*)
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173
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174 You always have a *default* profile which is the profile used when you don't select any
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175 (notably used in jp). This is the first profile that you have created except if you have
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176 changed it using a frontend (you can change it with jp).
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177
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178 .. _password hash: https://en.wikipedia.org/wiki/Key_derivation_function
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179 .. _at rest: https://en.wikipedia.org/wiki/Data_at_rest
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180
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181 profile key
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182 -----------
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183
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184 A profile **key** is a special name used as a way to select automatically one profile. The
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185 most important one is ``@DEFAULT@`` which, as you can guess, means the default profile.
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186
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187 bridge
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188 ------
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189
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190 The "bridge" is the name used to design Libervia's `IPC`_, or in other words the way
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191 the backend communicate with frontends. Several bridges can be used, the default one being
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192 `D-Bus`_.
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193
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194 The other available bridges are:
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195
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196 pb
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197 `Perspective Broker`_ is a part of `Twisted`_ (the framework used by the backend and some
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198 frontends)
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199
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200 embedded
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201 this embeds the backend into the frontend. The frontend is then using the backend as a
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202 library.
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203
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204 .. _IPC: https://en.wikipedia.org/wiki/Inter-process_communication
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205 .. _D-Bus: https://www.freedesktop.org/wiki/Software/dbus/
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206 .. _Perspective Broker: https://twistedmatrix.com/documents/current/core/howto/pb-intro.html
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207 .. _Twisted: https://twistedmatrix.com
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208
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209 Libervia Media
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210 --------------
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211
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212 Most of the frontends use images or other media. To avoid duplication and to make the code
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213 repositories lighter, those media are grouped in a separate repository. The Libervia media
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214 repository is available at https://repos.goffi.org/sat_media. You can also download media
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215 at https://ftp.goffi.org/sat_media/sat_media.tar.bz2. The path where Libervia media are
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216 installed must be specified in ``libervia.conf`` in ``media_dir`` option of the ``[DEFAULT``
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217 section.
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218
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219 Libervia Templates
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220 ------------------
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221
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222 Libervia embeds a `Jinja2`_ template engine (see `Libervia Web`_ above). "Libervia templates" refers to
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223 the default templates (i.e. the official templates, the ones used in default Libervia pages). Those template may also be used by other frontends than Libervia (jp can use them with the :ref:`libervia-cli_output` arguments).
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224
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225 Libervia templates repository is available at https://repos.goffi.org/sat_templates, they can
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226 also be downloaded at `PyPI <https://pypi.org/project/sat-templates/>`_ and will be
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227 installed automatically if you install Libervia.
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228
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229 Related projects
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230 ================
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231
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232 Some project are closely related to Libervia, here is a list of official related
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233 project.
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234
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235 Libervia PubSub
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236 ---------------
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237
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238 Numerous features of Libervia are taking profit of `PubSub`_ functionalities of XMPP.
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239 Because PubSub implementations in the wild are not all on the same level, and some
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240 experimental features are sometimes explored, a PubSub service as been written
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241 specifically for the needs of Libervia (but it's not depending on Libervia and any XMPP software can
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242 use it).
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243
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244 Libervia PubSub aims to be a feature complete, server-independent PubSub implementation, and
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245 try to be up-to-date with latest XMPP PubSub extensions. It is the privileged service to
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246 use with Libervia because it supports everything needed (but Libervia can work with any XMPP PubSub
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247 service, it will adapt itself to available features).
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248
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249 Libervia PubSub can also be used as a `PEP`_ service, if some XMPP extensions are supported by
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250 your server (see below).
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251
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252 .. _PubSub: https://xmpp.org/about/technology-overview.html#pubsub
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253 .. _PEP: https://xmpp.org/extensions/xep-0163.html
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254
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255 XMPP Extension Protocols
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256 ------------------------
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257
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258 For the needs of Libervia or Libervia PubSub, some `XMPP Extension Protocols`_ (or XEP) have been
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259 proposed and got an official number. The current list of extensions is:
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260
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261 `XEP-0355`_: Namespace Delegation
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262 This has been proposed for the needs of Libervia PubSub, and allows the XMPP server to
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263 "delegate" some features management to a third party service. It is needed to use Libervia
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264 Pubsub as a PEP service.
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265
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266 `XEP-0356`_: Privileged Entity
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267 In the same spirit as previous one, this has been done so Libervia PubSub could be used as a
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268 PEP service. This extensions allows a "component" (which is more or less a server
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269 generic plugin) to gain some privileged access to data such as presence information,
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270 roster or to send a message like if it was sent by the server.
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271
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272 `XEP-0413`_: Order-By
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273 This extension is used to specify the sorting order in which a client wishes to retrieve
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274 some results. It is notably used by Libervia and Libervia PubSub to retrieve items like blog posts
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275 or tickets in creation order or order of last modification.
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276
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277 .. _XEP-0355: https://xmpp.org/extensions/xep-0355.html
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278 .. _XEP-0356: https://xmpp.org/extensions/xep-0356.html
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279 .. _XEP-0413: https://xmpp.org/extensions/xep-0413.html
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280
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281 .. _XMPP Extension Protocols: https://xmpp.org/about/standards-process.html
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282
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283 Prosody's `mod_delegation`_ and `mod_privilege`_
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284 -------------------------------------------------
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285
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286 Prosody modules have been created to implement the *Namespace Delegation* and *Privileged
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287 Entity* extensions mentioned above. If you use Prosody, you'll have to activate those 2
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288 modules to use Libervia PubSub as a PEP service.
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289
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290 .. _mod_privilege: https://modules.prosody.im/mod_privilege.html
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291 .. _mod_delegation: https://modules.prosody.im/mod_delegation.html
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292
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293 Libervia official website
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294 -------------------------
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295
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296 The official website is made with Libervia web framework. You'll find it at https://repos.goffi.org/sat_web_site
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297
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298 Salut
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299 -----
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300 Probably the smaller side project used by Libervia, it is a simple users directory (registration must be done explicitly by users) using `XEP-0055`_ (Jabber Search).
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301
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302 You'll find it at https://repos.goffi.org/salut/
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303
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304 .. _XEP-0055: https://xmpp.org/extensions/xep-0055.html