Mercurial > libervia-backend
annotate doc/overview.rst @ 4272:89a0999884ac
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| author | Goffi <goffi@goffi.org> |
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| date | Thu, 20 Jun 2024 14:46:55 +0200 |
| parents | ba46d6a0ff3a |
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| 3022 | 1 ======== |
| 2 Overview | |
| 3 ======== | |
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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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21 |
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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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36 |
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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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46 |
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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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78 |
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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 Web 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 Web server. |
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83 |
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84 .. |
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85 # NOTE: currently not relevant as there is no Web APP anymore, may come back in the |
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86 future though |
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87 In the browser, you can access the server in two ways: either directly with what we call |
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88 **Libervia pages**, or with a JavaScript code in `single-page application`_ which is the |
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89 **Libervia client** (or **Libervia web app**) that we have mentioned above. |
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90 |
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91 The **Libervia Web Pages** are web pages managing a single feature. They can work without |
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92 JavaScript when it's possible (it's not the case for instant messaging or similar highly |
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93 dynamic contents). They aims to be simple and straightforward to use. That what you're |
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94 accessing when you're using Libervia Web. |
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95 |
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96 .. |
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97 #Note: as above, not relevant anymore but may come back in the future |
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98 The **Libervia Web Client** is a highly dynamic web application, used to access more features. |
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99 It's more complete and may be well adapted if you want to let Libervia running in a browser tab |
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100 for an extended period. |
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101 |
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102 Libervia Web is also the central part of the **Web Framework**. Indeed, in addition of |
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103 being a frontend to Libervia features (which is built with this framework), you can create |
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104 totally different websites which are integrated in Libervia (and so XMPP) ecosystem. This |
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105 framework uses Libervia template engine (based on `Jinja2`_) and makes the creation of |
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106 decentralised and federated websites simple. Thanks to this framework, it's easy to |
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107 experiment new ideas/features, or to change completely the look and feel of the Libervia |
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108 frontend. |
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109 |
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110 The `official Libervia website`_ is made with Libervia web framework. |
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111 |
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112 .. _single-page application: https://en.wikipedia.org/wiki/Single-page_application |
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113 .. _Jinja2: http://jinja.pocoo.org/ |
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114 .. _official Libervia website: https://salut-a-toi.org |
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115 |
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116 Libervia TUI (Primitivus) |
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117 ------------------------- |
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118 |
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119 Libervia TUI (alias ``Primitivus``) is the Terminal User Interface. In other words, it |
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120 works in console and is intended for people at ease with it. Its text only interface has |
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121 several advantages: you get rid of many distracting things (like images), it works without |
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122 graphical environment installed (which is often the case on servers) and it works on |
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123 distant shell (like `ssh`_) while staying gentle with your bandwidth. |
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124 |
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125 Primitivus is shipped with the backend, so it should be always available once Libervia is |
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126 installed (but some distributions may provide it separately). |
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127 |
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128 You can check :doc:`Libervia TUI documentation <libervia-tui/index>` for more details. |
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129 |
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130 .. _ssh: https://en.wikipedia.org/wiki/Secure_Shell |
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131 |
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132 Libervia CLI (jp) |
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133 ----------------- |
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134 |
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135 Libervia CLI (alias ``li`` or ``jp``) is the Command Line Interface. It's a |
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136 powerful tool which allows to do nearly everything you can do with other frontends. |
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137 Particularly useful if you want to check something quickly, or if you want to do some |
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138 automation. |
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139 |
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140 You can check :doc:`Libervia CLI documentation <libervia-cli/index>` documentation for more details. |
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141 |
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142 .. _glossary: |
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143 |
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144 Glossary |
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145 ======== |
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146 |
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147 While using Libervia you may see some terms or concept. This section explain the most important |
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148 ones. |
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149 |
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150 profile |
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151 ------- |
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152 |
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153 A profile is the name linked to an account data. Usually a profile correspond to an XMPP |
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154 account, but you can have several profiles using the same XMPP account (with different |
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155 parameters) even if this is not usual. |
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156 |
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157 On a Libervia installation used by a single user, the profiles are usually used for multiple |
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158 accounts. On a multi-users installations, there is usually one profile per user. |
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159 |
| 4249 | 160 When you connect to a Libervia frontend, you need to specify a profile and the associated |
| 161 password. The profile password is not the same as the password of the XMPP account. While | |
| 162 this may sounds confusing, there are several reason why we use this notion of profile | |
| 163 instead of directly the XMPP account/password: | |
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164 |
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165 - Libervia needs to know the plain XMPP password to connect, and it is encrypted in database. |
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166 The profile password is used to encrypt/decrypt it, this way only a `password hash`_ is |
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167 stored and the XMPP password is encrypted `at rest`_. |
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168 |
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169 - As a further benefit, several passwords could be associated to the same profile (this |
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170 feature is currently not used in Libervia). |
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171 |
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172 - profile password can be empty, in which case no password is requested when a profile is |
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173 used |
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174 |
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175 .. note:: |
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176 |
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177 if you use an empty profile password, the XMPP password won't be encrypted in database |
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178 (or more precisely, will be trivial to decrypt). |
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179 |
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180 - a profile is a simple name associated with an account, it's easier to remember than a |
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181 whole XMPP identifier (also named "JID" for *Jabber ID*) |
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182 |
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183 You always have a *default* profile which is the profile used when you don't select any |
| 4249 | 184 (notably used in Libervia CLI). This is the first profile that you have created except if |
| 185 you have changed it using a frontend (you can change it with Libervia CLI). | |
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186 |
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187 .. _password hash: https://en.wikipedia.org/wiki/Key_derivation_function |
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188 .. _at rest: https://en.wikipedia.org/wiki/Data_at_rest |
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189 |
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190 profile key |
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191 ----------- |
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192 |
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193 A profile **key** is a special name used as a way to select automatically one profile. The |
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194 most important one is ``@DEFAULT@`` which, as you can guess, means the default profile. |
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195 |
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196 bridge |
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197 ------ |
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198 |
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199 The "bridge" is the name used to design Libervia's `IPC`_, or in other words the way |
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200 the backend communicate with frontends. Several bridges can be used, the default one being |
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201 `D-Bus`_. |
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202 |
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203 The other available bridges are: |
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204 |
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205 pb |
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206 `Perspective Broker`_ is a part of `Twisted`_ (the framework used by the backend and some |
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207 frontends) |
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208 |
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209 embedded |
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210 this embeds the backend into the frontend. The frontend is then using the backend as a |
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211 library. |
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212 |
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213 .. _IPC: https://en.wikipedia.org/wiki/Inter-process_communication |
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214 .. _D-Bus: https://www.freedesktop.org/wiki/Software/dbus/ |
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215 .. _Perspective Broker: https://twistedmatrix.com/documents/current/core/howto/pb-intro.html |
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216 .. _Twisted: https://twistedmatrix.com |
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217 |
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218 Libervia Media |
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219 -------------- |
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220 |
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221 Most of the frontends use images or other media. To avoid duplication and to make the code |
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222 repositories lighter, those media are grouped in a separate repository. The Libervia media |
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223 repository is available at https://repos.goffi.org/sat_media. You can also download media |
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224 at https://ftp.goffi.org/sat_media/sat_media.tar.bz2. The path where Libervia media are |
| 4249 | 225 installed must be specified in ``libervia.conf`` in ``media_dir`` option of the ``[DEFAULT]`` |
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226 section. |
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227 |
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228 Libervia Templates |
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229 ------------------ |
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230 |
| 4249 | 231 Libervia embeds a `Jinja2`_ template engine (see `Libervia Web`_ above). "Libervia |
| 232 templates" refers to the default templates (i.e. the official templates, the ones used in | |
| 233 default Libervia pages). Those template may also be used by other frontends than Libervia | |
| 234 (Libervia CLI can use them with the :ref:`libervia-cli_output` arguments). | |
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235 |
| 4249 | 236 Libervia templates repository is available at https://repos.goffi.org/libervia-templates, they can |
| 237 also be downloaded at `PyPI <https://pypi.org/project/libervia-templates/>`_ and will be | |
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238 installed automatically if you install Libervia. |
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239 |
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240 Related projects |
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241 ================ |
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242 |
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243 Some project are closely related to Libervia, here is a list of official related |
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244 project. |
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245 |
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246 Libervia PubSub |
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247 --------------- |
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248 |
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249 Numerous features of Libervia are taking profit of `PubSub`_ functionalities of XMPP. |
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250 Because PubSub implementations in the wild are not all on the same level, and some |
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251 experimental features are sometimes explored, a PubSub service as been written |
| 4249 | 252 specifically for the needs of Libervia (but it's not depending on Libervia and any XMPP |
| 253 software can use it). | |
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254 |
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255 Libervia PubSub aims to be a feature complete, server-independent PubSub implementation, and |
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256 try to be up-to-date with latest XMPP PubSub extensions. It is the privileged service to |
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257 use with Libervia because it supports everything needed (but Libervia can work with any XMPP PubSub |
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258 service, it will adapt itself to available features). |
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259 |
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260 Libervia PubSub can also be used as a `PEP`_ service, if some XMPP extensions are supported by |
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261 your server (see below). |
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262 |
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263 .. _PubSub: https://xmpp.org/about/technology-overview.html#pubsub |
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264 .. _PEP: https://xmpp.org/extensions/xep-0163.html |
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265 |
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266 XMPP Extension Protocols |
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267 ------------------------ |
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268 |
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269 For the needs of Libervia or Libervia PubSub, some `XMPP Extension Protocols`_ (or XEP) have been |
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270 proposed and got an official number. The current list of extensions is: |
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271 |
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272 `XEP-0355`_: Namespace Delegation |
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273 This has been proposed for the needs of Libervia PubSub, and allows the XMPP server to |
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274 "delegate" some features management to a third party service. It is needed to use Libervia |
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275 Pubsub as a PEP service. |
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276 |
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277 `XEP-0356`_: Privileged Entity |
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278 In the same spirit as previous one, this has been done so Libervia PubSub could be used as a |
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279 PEP service. This extensions allows a "component" (which is more or less a server |
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280 generic plugin) to gain some privileged access to data such as presence information, |
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281 roster or to send a message like if it was sent by the server. |
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282 |
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283 `XEP-0413`_: Order-By |
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284 This extension is used to specify the sorting order in which a client wishes to retrieve |
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285 some results. It is notably used by Libervia and Libervia PubSub to retrieve items like blog posts |
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286 or tickets in creation order or order of last modification. |
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287 |
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288 .. _XEP-0355: https://xmpp.org/extensions/xep-0355.html |
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289 .. _XEP-0356: https://xmpp.org/extensions/xep-0356.html |
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290 .. _XEP-0413: https://xmpp.org/extensions/xep-0413.html |
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291 |
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292 .. _XMPP Extension Protocols: https://xmpp.org/about/standards-process.html |
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293 |
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294 Prosody's `mod_delegation`_ and `mod_privilege`_ |
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295 ------------------------------------------------- |
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296 |
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297 Prosody modules have been created to implement the *Namespace Delegation* and *Privileged |
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298 Entity* extensions mentioned above. If you use Prosody, you'll have to activate those 2 |
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299 modules to use Libervia PubSub as a PEP service. |
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300 |
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301 .. _mod_privilege: https://modules.prosody.im/mod_privilege.html |
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302 .. _mod_delegation: https://modules.prosody.im/mod_delegation.html |
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303 |
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304 Libervia official website |
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305 ------------------------- |
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306 |
| 4249 | 307 The official website is made with Libervia web framework. You'll find it at https://repos.goffi.org/libervia-website |
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308 |
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309 Salut |
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310 ----- |
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311 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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312 |
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313 You'll find it at https://repos.goffi.org/salut/ |
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314 |
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315 .. _XEP-0055: https://xmpp.org/extensions/xep-0055.html |