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annotate doc/libervia-cli/pubsub.rst @ 3652:6e34307319c0

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plugin XEP-0353: fix jingle initiation on disco "Service Unavailable" error: When requesting disco info on a bare jid which is not in our roster, server may return "Service Unavailable" (to avoid leaking valid JIDs). In this case, the initiation was failing, this is now fixed by using empty categories in this case.
author Goffi <goffi@goffi.org>
date Wed, 08 Sep 2021 11:16:52 +0200
parents 7acf19bdca2f
children 7bc443253b7c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 .. _libervia-cli_pubsub:
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2
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3 =========================
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4 pubsub: PubSub management
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5 =========================
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6
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7 PubSub commands are low level command to handle a PubSub Service.
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8 They are using the generic pubsub arguments
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9
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10 For most of those commands, :ref:`pubsub_common` commands are used to specify the
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11 destination item.
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12
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13 set
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14 ===
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15
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16 Publish a pubsub item.
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17
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18 ``stdin`` is used to get the raw XML of the payload of the item to publish.
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19
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20 ``-f KEY VALUE, --field KEY VALUE`` can be used to specify publish options, i.e. option
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21 which must be set if the node already exists, or used if the node is to be created, see
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22 `XEP-0060 §7.1.5`_ for details.
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24 In the same way as for :ref:`libervia-cli_pubsub_node_create`, ``-F, --full-prefix`` can be used if
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25 you need to specify the full option name.
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26
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27 .. _XEP-0060 §7.1.5: https://xmpp.org/extensions/xep-0060.html#publisher-publish-options
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29 example
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30 -------
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31
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32 Create an item with a custom note XML::
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33
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34 $ echo '<note xmlns="http://example.net/mynotes">this is a note</note>' | li pubsub set -n "notes"
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35
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36 get
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37 ===
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38
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39 Retrieve items from specified node. Default output is prettified and highlighted XML.
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40
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41 example
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42 -------
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43
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44 Retrieve the last 5 notes from our custom notes node::
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45
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46 $ li pubsub get -n notes -m 5
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47
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48 .. _li_pubsub_delete:
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49
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50 delete
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51 ======
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52
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53 Delete an item from a node. If ``-N, --notify`` is specified, subscribers will be notified
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54 of the item retraction.
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55
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56 By default a confirmation is requested before deletion is requested to the PubSub service,
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57 but you can override this behaviour by using ``-f, --force`` option.
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58
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59 example
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60 -------
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61
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62 Delete item with id ``123456`` from a node::
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63
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64 $ li pubsub delete -n test_node -i 123456
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65
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66 edit
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67 ====
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68
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69 Edit the raw XML of an item payload using your local editor (the one set in ``$EDITOR``).
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70
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71 If you don't change anything or publish an empty blog post, the edition will be cancelled.
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72
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73 :ref:`draft_common` commands can be used.
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75 example
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76 -------
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77
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78 Edit the last note in our custom node::
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79
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80 $ li pubsub edit -n notes -L
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82 .. _li-pubsub_rename:
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84 rename
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85 ======
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86
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87 Move a item to a new ID. As there is currently no "rename" or "move" operation in XMPP
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88 PubSub, this is done by republishing the item with the new ID, then deleting the old item
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89 if the publication succeed.
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91 This is notably useful when user friendly URL based on ID are used, and one need to fix a
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92 typo or something else.
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93
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94 example
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95 -------
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97 Rename a PubSub item with ID ``123`` to ``456``::
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98
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99 $ li pubsub rename -n some_node -i 123 456
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100
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101 subscribe
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102 =========
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103
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104 Subscribe to a node.
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106 Subscription is used to get notifications from the node in case of new/updated item or
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107 deletion.
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108
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109 example
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110 -------
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112 Subscribe to an information blog::
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114 $ li pubsub subscribe -n informations -s pubsub.example.net
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115
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116 unsubscribe
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117 ===========
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118
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119 Unsubscribe from a node.
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121 example
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122 -------
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123
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124 Unsubscribe from an information blog::
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125
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126 $ li pubsub unsubscribe -n informations -s pubsub.example.net
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127
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128 subscriptions
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129 =============
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131 Retrieve subscriptions for all nodes on a service.
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132
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133 ``-n NODE, --node NODE`` can be used to request subscriptions for a specific node (e.g. if
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134 it has subscription with multiple subIDs).
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136 example
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137 -------
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138
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139 Retrieve all subscriptions on a pubsub service::
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140
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141 $ li pubsub subscriptions -s pubsub@example.net
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142
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143 affiliations
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144 =============
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145
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146 Retrieve affiliations for all nodes at a service.
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147
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148 ``-n NODE, --node NODE`` can be used to request affiliation for a specific node.
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149
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150 examples
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151 --------
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152
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153 Retrieve all affiliations at a pubsub service::
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154
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155 $ li pubsub affiliations -s pubsub@example.net
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156
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157 Retrieve affiliation for the ``notes`` node::
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158
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159 $ li pubsub affiliations -s pubsub@example.net -n notes
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160
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161 search
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162 ======
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163
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164 Search items corresponding to one or more filter(s).
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165
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166 ``search`` will check all items (or some of them according to options used) from one or
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167 several nodes (several nodes can be checked if recursion is used, see below). For each
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168 item the given filters will be checked, and all corresponding items will be returned.
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169
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170 This is a resource intensive method (both for server and client), use with caution, and
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171 use MAM to do searching when suitable.
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172
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173 filters
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174 -------
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175
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176 To do a search you one or more filters. Filters are checked in the order in which they are
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177 specified. You can use 4 kinds of filters:
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178
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179 ``-t TEXT, --text TEXT``
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180 do a full-text search. If *TEXT* is appearing anywhere in the item (including in XML
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181 tags or arguments), the item is selected
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182
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183 ``-r EXPRESSION, --regex EXPRESSION``
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184 do a regular expression search. `Python standard re module`_ is used internally, so you
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185 can use its syntax.
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186
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187 ``-x XPATH, --xpath XPATH``
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188 use an `XPath version 1.0`_ expression to filter the query. You can have a look at
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189 `Wikipedia XPath page`_ for a user friendly introduction.
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190
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191 ``-P PYTHON_CODE, --python PYTHON_CODE``
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192 use a Python expression to do a test. The expression must return a boolean (``True`` to
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193 keep item, ``False`` otherwise). From within the Python expression 3 variables are
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194 defined: ``item`` which contain the raw item as a string, and ``item_xml`` which is the
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195 parsed XML as an lxml ``etree.Element`` and ``etree`` which is the ``lxml.etree`` module.
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196
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197 .. _Python standard re module: https://docs.python.org/3.7/library/re.html
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198 .. _XPath version 1.0: https://www.w3.org/TR/1999/REC-xpath-19991116/
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199 .. _Wikipedia XPath page: https://en.wikipedia.org/wiki/XPath
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200
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201 filter modifiers
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202 ----------------
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203
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204 Before each filter you can specify one or more filter modifiers. A modifier will change
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205 filter behaviour, it's a flag which can be used either without argument (then it will
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206 activate the flag), or with an explicit boolean value (i.e. ``true`` or ``false``).
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207
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208 The available filters are:
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209
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210 ``-C [BOOLEAN], --ignore-case [BOOLEAN]``
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211 (don't) ignore case. Filters are normally case sensitive, this modifier change this
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212 behaviour.
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213
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214 ``-I [BOOLEAN], --invert [BOOLEAN]``
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215 (don't) invert effect of following filters. This is applying a logical ``NOT`` to the
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216 filter. This means that instead of keeping item matching the filter, it will keep the
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217 items which are **not** matching the filter.
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218
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219 ``-A [BOOLEAN], --dot-all [BOOLEAN]``
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220 (don't) use `DOTALL`_ option for regex. This filter only makes sense before a
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221 ``--regex`` expression.
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222
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223 ``-k [BOOLEAN], --only-matching [BOOLEAN]``
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224 (don't) keep only the matching part of the item. Normally the whole item is returned,
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225 with this flag, only the part matching the filters are kept.
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226
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227 .. _DOTALL: https://docs.python.org/3.7/library/re.html#re.DOTALL
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228
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229 actions
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230 -------
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231
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232 Once filters are set, you may indicate what do to with the found items. By default they
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233 are printed, but you can also use an other li command, or even an external tool.
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234
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235 The following actions are available:
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236
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237 ``print`` (default)
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238 pretty print the found items.
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239
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240 ``exec``
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241 use the given li command on each found item. Everything after the ``exec`` is used to
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242 indicate the command and arguments to use (you must not specify ``li``, use the command
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243 directly). The service, node and item will be set to match the found item.
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244
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245 ``external``
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246 pipe the raw XML of each item to the given command. Everything after the ``external``
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247 action is used to indicate the command and arguments to use.
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248
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249 recursive search
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250 ----------------
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251
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252 By default, only items in the given node will be filtered, but if you specify a recursion
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253 depth > 0 (using ``-D MAX_DEPTH, --max-depth MAX_DEPTH``), every node linked in item will
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254 be checked too, then node linked in linked item and so on until depth level is reached.
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255
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256 For instance, if you want to find all comments of a blog node containing an http(s) link,
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257 you can do that::
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258
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259 $ li pubsub search -n urn:xmpp:microblog:0 -s user@example.net -D 1 -r 'https?://'
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260
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261 examples
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262 --------
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263
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264 Finding all items containing the text "something interesting" in personal blog::
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265
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266 $ li pubsub search -n urn:xmpp:microblog:0 -M -1 -t "something interesting"
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267
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268 Find which blog items in the last 20 have a body with less than 200 characters (note that
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269 body can be either ``<title>`` or ``<content>``, see `XEP-0277`_ for details). Here we use
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270 a python expression on the text of the body to count the number of characters::
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271
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272 $ li pubsub search -n urn:xmpp:microblog:0 -M 20 --python "len((item_xml.find('.//{http://www.w3.org/2005/Atom}content[@type=\"text\"]') or item_xml.find('.//{http://www.w3.org/2005/Atom}title[@type=\"text\"]')).text) < 200"
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273
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274 Find items published by ``toto@example.net`` among last 30 on a blog node, and use
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275 ``pubsub blog`` command to retrieve id and title. We use ``-N`` to specify the ``pubsub``
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276 namespace which is used in the XPath expression, then we use ``exec`` to run ``blog get -k
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277 title -k id`` on found items::
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278
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279 $ li pubsub search -n some_blog_node -s pubsub.example.net -M 30 -N pubsub http://jabber.org/protocol/pubsub -x '/pubsub:item[starts-with(@publisher, "toto@example.net")]' exec blog get -k title -k id
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280
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281 Find items which have **NOT** a title among last 30 items in our personal blog. As
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282 explained in `XEP-0277`_ Atom's ``<title>`` is always used (even if there is only a body
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283 and no title), so we actually look for items without ``<content>``. We do that with an
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284 XPath looking for this ``atom:content`` element, then we use the ``-I [BOOLEAN], --invert
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285 [BOOLEAN]`` to filter out elements which match.::
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286
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287 $ li pubsub search -n urn:xmpp:microblog:0 -M 30 -I -x //atom:content -N atom http://www.w3.org/2005/Atom
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288
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289 Display authors names from last 10 items and their comments, using the ``-k [BOOLEAN],
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290 --only-matching [BOOLEAN]`` modifier to only display the data we need. We use ``-D 1`` to
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291 do a recursive search of level 1, which will also look into comments nodes (using last 10
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292 items there too)::
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293
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294 $ li pubsub search -n urn:xmpp:microblog:0 -M 10 --only-matching -x //atom:author/atom:name -N atom http://www.w3.org/2005/Atom -D 1
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295
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296 .. _XEP-0277: https://xmpp.org/extensions/xep-0277.html
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297
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298 transform
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299 =========
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300
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301 Modify items using an external command.
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302
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303 ``transform`` will retrieve requested items, and will send each of them to the standard
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304 input (stdin) of the specified command. The output of the command will be used, it can be
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305 3 things:
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306
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307 - a raw XML of the modified item, in which case the item will be republished
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308 - the string ``SKIP``, in which case the item will be ignored
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309 - the string ``DELETE``, in which case the item will be retracted
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310
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311 By default a dry run is done, which means that no item is modified or deleted. To actually
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312 do the transformation, you have to use ``--apply`` argument.
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313
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314 If you have to modify the ``publisher`` of an item, you need specific privileges. The
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315 ``--admin`` allows you do to that, but it must be supported by your PubSub service
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316 (currently only ``Libervia PubSub`` supports this non standard feature).
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317
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318 To modify all items of a node, use the ``-A, --all`` option. This will use `RSM`_
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319 repetitively until all items are treated. Of course that means that your PubSub service
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320 must support RSM. The items being republished, they will reappear on top of your node,
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321 that's why it is recommended to use ``--order-by creation`` option when supported by the
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322 service, to keep consistent order and avoid transforming the same items several times.
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323
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324 If the command you're using exit with a non zero code, the process will stop. Use ``-I,
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325 --ignore_errors`` if you want to continue transformation even if an non zero code is
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326 returned.
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327
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328 .. _RSM: https://xmpp.org/extensions/xep-0059.html
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329
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330 example
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331 -------
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332
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333 Imagine that you want to replace all occurrences of "sàt" by "Libervia" in your personal blog. You first create a Python script like this:
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334
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335 .. sourcecode:: python
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336
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337 #!/usr/bin/env python3
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338
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339 import sys
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340 item_raw = sys.stdin.read()
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341 if not "sàt" in item_raw:
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342 print("SKIP")
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343 else:
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344 print(item_raw.replace("sàt", "Libervia"))
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345
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346 And save it a some location, e.g. ``~/expand_sat.py`` (don't forget to make it executable
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347 with ``chmod +x ~/expand_sat.py``).
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348
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349 To be sure it's safe, you can first do a dry-run and check the result::
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350
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351 $ li pubsub transform -n urn:xmpp:microblog:0 -A -o creation ~/expand_sat.py
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352
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353 Once you have checked that you have the expected behaviour, you can apply the
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354 transformations::
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355
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356 $ li pubsub transform -n urn:xmpp:microblog:0 -A -o creation --apply ~/expand_sat.py
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357
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358 And that's it. You can use the same technique for more complex transformations, including
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359 modifying the XML (with Python, you can easily do that with standard
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360 ``xml.etree.ElementTree`` module or with ``lxml.etree``).
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361
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362 uri
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363 ===
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364
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365 Build an XMPP URI linking to a PubSub node or item.
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366
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367 example
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368 -------
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369
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370 Build a link to personal blog::
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371
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372 $ li pubsub uri -n urn:xmpp:microblog:0
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373
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374 node
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375 ====
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376
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377 Subcommands for node management. Please check :ref:`libervia-cli_pubsub_node`.
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378
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379 hook
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380 ====
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381
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382 Subcommands for hooks management. Please check :ref:`libervia-cli_pubsub_hook`.