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annotate doc/jp/pubsub.rst @ 3317:83f25da66bec

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core (memory): files are now public by default except for those in root directory: using public permissions by default makes permissions change more easy as we don't have to recursively change all permissions of sub files when changing directory. Root directories are private by default.
author Goffi <goffi@goffi.org>
date Sat, 01 Aug 2020 16:02:41 +0200
parents cea52c9ddfd9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 .. _jp-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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23
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24 In the same way as for :ref:`jp-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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28
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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>' | jp 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 $ jp pubsub get -n notes -m 5
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47
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48 delete
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49 ======
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50
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51 Delete an item from a node. If ``-N, --notify`` is specified, subscribers will be notified
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52 of the item retraction.
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53
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54 By default a confirmation is requested before deletion is requested to the PubSub service,
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55 but you can override this behaviour by using ``-f, --force`` option.
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56
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57 example
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58 -------
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59
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60 Delete item with id ``123456`` from a node::
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61
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62 $ jp pubsub delete -n test_node -i 123456
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63
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64 edit
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65 ====
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66
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67 Edit the raw XML of an item payload using your local editor (the one set in ``$EDITOR``).
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68
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69 If you don't change anything or publish an empty blog post, the edition will be cancelled.
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70
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71 :ref:`draft_common` commands can be used.
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72
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73 example
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74 -------
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75
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76 Edit the last note in our custom node::
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77
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78 $ jp pubsub edit -n notes -L
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79
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80 subscribe
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81 =========
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82
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83 Subscribe to a node.
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84
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85 Subscription is used to get notifications from the node in case of new/updated item or
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86 deletion.
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87
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88 example
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89 -------
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90
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91 Subscribe to an information blog::
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92
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93 $ jp pubsub subscribe -n informations -s pubsub.example.net
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94
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95 unsubscribe
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96 ===========
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97
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98 Unsubscribe from a node.
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99
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100 example
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101 -------
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102
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103 Unsubscribe from an information blog::
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104
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105 $ jp pubsub unsubscribe -n informations -s pubsub.example.net
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106
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107 subscriptions
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108 =============
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109
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110 Retrieve subscriptions for all nodes on a service.
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111
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112 ``-n NODE, --node NODE`` can be used to request subscriptions for a specific node (e.g. if
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113 it has subscription with multiple subIDs).
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114
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115 example
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116 -------
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117
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118 Retrieve all subscriptions on a pubsub service::
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119
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120 $ jp pubsub subscriptions -s pubsub@example.net
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121
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122 affiliations
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123 =============
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124
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125 Retrieve affiliations for all nodes at a service.
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126
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127 ``-n NODE, --node NODE`` can be used to request affiliation for a specific node.
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128
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129 examples
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130 --------
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131
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132 Retrieve all affiliations at a pubsub service::
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133
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134 $ jp pubsub affiliations -s pubsub@example.net
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135
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136 Retrieve affiliation for the ``notes`` node::
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137
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138 $ jp pubsub affiliations -s pubsub@example.net -n notes
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139
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140 search
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141 ======
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142
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143 Search items corresponding to one or more filter(s).
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144
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145 ``search`` will check all items (or some of them according to options used) from one or
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146 several nodes (several nodes can be checked if recursion is used, see below). For each
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147 item the given filters will be checked, and all corresponding items will be returned.
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148
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149 This is a resource intensive method (both for server and client), use with caution, and
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150 use MAM to do searching when suitable.
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151
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152 filters
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153 -------
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154
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155 To do a search you one or more filters. Filters are checked in the order in which they are
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156 specified. You can use 4 kinds of filters:
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157
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158 ``-t TEXT, --text TEXT``
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159 do a full-text search. If *TEXT* is appearing anywhere in the item (including in XML
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160 tags or arguments), the item is selected
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161
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162 ``-r EXPRESSION, --regex EXPRESSION``
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163 do a regular expression search. `Python standard re module`_ is used internally, so you
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164 can use its syntax.
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165
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166 ``-x XPATH, --xpath XPATH``
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167 use an `XPath version 1.0`_ expression to filter the query. You can have a look at
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168 `Wikipedia XPath page`_ for a user friendly introduction.
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169
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170 ``-P PYTHON_CODE, --python PYTHON_CODE``
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171 use a Python expression to do a test. The expression must return a boolean (``True`` to
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172 keep item, ``False`` otherwise). From within the Python expression 3 variables are
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173 defined: ``item`` which contain the raw item as a string, and ``item_xml`` which is the
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174 parsed XML as an lxml ``etree.Element`` and ``etree`` which is the ``lxml.etree`` module.
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175
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176 .. _Python standard re module: https://docs.python.org/3.7/library/re.html
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177 .. _XPath version 1.0: https://www.w3.org/TR/1999/REC-xpath-19991116/
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178 .. _Wikipedia XPath page: https://en.wikipedia.org/wiki/XPath
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179
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180 filter modifiers
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181 ----------------
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182
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183 Before each filter you can specify one or more filter modifiers. A modifier will change
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184 filter behaviour, it's a flag which can be used either without argument (then it will
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185 activate the flag), or with an explicit boolean value (i.e. ``true`` or ``false``).
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186
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187 The available filters are:
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188
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189 ``-C [BOOLEAN], --ignore-case [BOOLEAN]``
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190 (don't) ignore case. Filters are normally case sensitive, this modifier change this
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191 behaviour.
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192
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193 ``-I [BOOLEAN], --invert [BOOLEAN]``
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194 (don't) invert effect of following filters. This is applying a logical ``NOT`` to the
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195 filter. This means that instead of keeping item matching the filter, it will keep the
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196 items which are **not** matching the filter.
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197
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198 ``-A [BOOLEAN], --dot-all [BOOLEAN]``
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199 (don't) use `DOTALL`_ option for regex. This filter only makes sense before a
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200 ``--regex`` expression.
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201
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202 ``-k [BOOLEAN], --only-matching [BOOLEAN]``
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203 (don't) keep only the matching part of the item. Normally the whole item is returned,
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204 with this flag, only the part matching the filters are kept.
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205
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206 .. _DOTALL: https://docs.python.org/3.7/library/re.html#re.DOTALL
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207
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208 actions
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209 -------
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210
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211 Once filters are set, you may indicate what do to with the found items. By default they
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212 are printed, but you can also use an other jp command, or even an external tool.
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213
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214 The following actions are available:
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215
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216 ``print`` (default)
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217 pretty print the found items.
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218
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219 ``exec``
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220 use the given jp command on each found item. Everything after the ``exec`` is used to
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221 indicate the command and arguments to use (you must not specify ``jp``, use the command
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222 directly). The service, node and item will be set to match the found item.
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223
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224 ``external``
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225 pipe the raw XML of each item to the given command. Everything after the ``external``
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226 action is used to indicate the command and arguments to use.
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227
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228 recursive search
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229 ----------------
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230
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231 By default, only items in the given node will be filtered, but if you specify a recursion
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232 depth > 0 (using ``-D MAX_DEPTH, --max-depth MAX_DEPTH``), every node linked in item will
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233 be checked too, then node linked in linked item and so on until depth level is reached.
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234
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235 For instance, if you want to find all comments of a blog node containing an http(s) link,
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236 you can do that::
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237
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238 $ jp pubsub search -n urn:xmpp:microblog:0 -s user@example.net -D 1 -r 'https?://'
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239
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240 examples
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241 --------
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242
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243 Finding all items containing the text "something interesting" in personal blog::
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244
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245 $ jp pubsub search -n urn:xmpp:microblog:0 -M -1 -t "something interesting"
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246
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247 Find which blog items in the last 20 have a body with less than 200 characters (note that
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248 body can be either ``<title>`` or ``<content>``, see `XEP-0277`_ for details). Here we use
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249 a python expression on the text of the body to count the number of characters::
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250
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251 $ jp 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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252
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253 Find items published by ``toto@example.net`` among last 30 on a blog node, and use
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254 ``pubsub blog`` command to retrieve id and title. We use ``-N`` to specify the ``pubsub``
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255 namespace which is used in the XPath expression, then we use ``exec`` to run ``blog get -k
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256 title -k id`` on found items::
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257
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258 $ jp 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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259
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260 Find items which have **NOT** a title among last 30 items in our personal blog. As
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261 explained in `XEP-0277`_ Atom's ``<title>`` is always used (even if there is only a body
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262 and no title), so we actually look for items without ``<content>``. We do that with an
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263 XPath looking for this ``atom:content`` element, then we use the ``-I [BOOLEAN], --invert
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264 [BOOLEAN]`` to filter out elements which match.::
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265
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266 $ jp 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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267
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268 Display authors names from last 10 items and their comments, using the ``-k [BOOLEAN],
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269 --only-matching [BOOLEAN]`` modifier to only display the data we need. We use ``-D 1`` to
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270 do a recursive search of level 1, which will also look into comments nodes (using last 10
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271 items there too)::
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272
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273 $ jp 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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274
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275 .. _XEP-0277: https://xmpp.org/extensions/xep-0277.html
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276
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277 transform
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278 =========
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279
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280 Modify items using an external command.
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281
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282 ``transform`` will retrieve requested items, and will send each of them to the standard
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283 input (stdin) of the specified command. The output of the command will be used, it can be
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284 3 things:
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285
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286 - a raw XML of the modified item, in which case the item will be republished
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287 - the string ``SKIP``, in which case the item will be ignored
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288 - the string ``DELETE``, in which case the item will be retracted
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289
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290 By default a dry run is done, which means that no item is modified or deleted. To actually
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291 do the transformation, you have to use ``--apply`` argument.
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292
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293 If you have to modify the ``publisher`` of an item, you need specific privileges. The
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294 ``--admin`` allows you do to that, but it must be supported by your PubSub service
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295 (currently only ``SàT PubSub`` supports this non standard feature).
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296
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297 To modify all items of a node, use the ``-A, --all`` option. This will use `RSM`_
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298 repetitively until all items are treated. Of course that means that your PubSub service
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299 must support RSM. The items being republished, they will reappear on top of your node,
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300 that's why it is recommended to use ``--order-by creation`` option when supported by the
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301 service, to keep consistent order and avoid transforming the same items several times.
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302
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303 If the command you're using exit with a non zero code, the process will stop. Use ``-I,
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304 --ignore_errors`` if you want to continue transformation even if an non zero code is
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305 returned.
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306
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307 .. _RSM: https://xmpp.org/extensions/xep-0059.html
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308
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309 example
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310 -------
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311
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312 Imagine that you want to replace all occurrences of "sàt" by "Salut à Toi" in your personal blog. You first create a Python script like this:
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313
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314 .. sourcecode:: python
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315
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316 #!/usr/bin/env python3
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317
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318 import sys
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319 item_raw = sys.stdin.read()
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320 if not "sàt" in item_raw:
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321 print("SKIP")
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322 else:
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323 print(item_raw.replace("sàt", "Salut à Toi"))
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324
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325 And save it a some location, e.g. ``~/expand_sat.py`` (don't forget to make is executable
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326 with ``chmod +x ~/expand_sat.py``).
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327
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328 To be sure it's safe, you can first do a dry-run and check the result::
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329
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330 $ jp pubsub transform -n urn:xmpp:microblog:0 -A -o creation ~/expand_sat.py
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331
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332 Once you have checked that you have the expected behaviour, you can apply the
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333 transformations::
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334
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335 $ jp pubsub transform -n urn:xmpp:microblog:0 -A -o creation --apply ~/expand_sat.py
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336
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337 And that's it. You can use the same technique for more complex transformations, including
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338 modifying the XML (with Python, you can easily do that with standard
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339 ``xml.etree.ElementTree`` module or with ``lxml.etree``).
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340
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341 uri
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342 ===
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343
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344 Build an XMPP URI linking to a PubSub node or item.
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345
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346 example
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347 -------
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348
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349 Build a link to personal blog::
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350
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351 $ jp pubsub uri -n urn:xmpp:microblog:0
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352
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353 node
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354 ====
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355
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356 Subcommands for node management. Please check :ref:`jp-pubsub_node`.
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357
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358 hook
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359 ====
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360
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361 Subcommands for hooks management. Please check :ref:`jp-pubsub_hook`.