annotate mod_pubsub_post/README.markdown @ 4895:2542fd80cd15

mod_turn_external: Fix type of config option (thanks mirux) There was a separate boolean option to enable TLS before, but it was merged with the port number option and it seems the typed API interface got confused. Backport of trunk rev aa7a8aa64d3f
author Kim Alvefur <zash@zash.se>
date Tue, 15 Feb 2022 21:51:52 +0100
parents 8d4b91a703af
children 18774cc621d6
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1 ---
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2 labels:
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3 - 'Stage-Stable'
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4 summary: Publish to PubSub nodes from via HTTP POST/WebHooks
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5 ---
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6
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7 # Introduction
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8
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9 This module is a fairly generic WebHook receiver that lets you easily
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10 publish data to PubSub using a HTTP POST request. The payload can be
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11 Atom feeds, arbitrary XML, or arbitrary JSON. The type should be
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12 indicated via the `Content-Type` header.
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13
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14 - JSON data is wrapped in a [XEP-0335] container.
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15 - An Atom feed may have many `<entry>` and each one is published as
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16 its own PubSub item.
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17 - Other XML is simply published to the item with ID `current`.
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18
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19 ## JSON example
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20
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21 ``` {.bash}
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22 curl http://localhost:5280/pubsub_post/princely_musings \
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23 -H "Content-Type: application/json" \
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24 --data-binary '{"musing":"To be, or not to be: that is the question"}'
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25 ```
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26
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27 ## Atom example
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28
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29 ``` {.bash}
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30 curl http://localhost:5280/pubsub_post/princely_musings \
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31 -H "Content-Type: application/xml" \
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32 --data-binary '<feed xmlns="http://www.w3.org/2005/Atom">
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33 <entry><title>Hello</title></entry></feed>'
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34 ```
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35
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36 ## Simple form-data
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37
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38 ``` {.bash}
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39 curl http://localhost:5280/pubsub_post/princely_musings \
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40 --data musing="To be, or not to be: that is the question"
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41 ```
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42
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43 # Configuration
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44
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45 All settings are optional.
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46
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47 ## Actor identification
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48
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49 First we have to figure out who is making the request.
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50 This is configured on a per-node basis like this:
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51
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52 ``` {.lua}
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53 -- Per node secrets
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54 pubsub_post_actors = {
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55 princely_musings = "hamlet@denmark.lit"
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56 }
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57 pubsub_post_default_actor = "nobody@nowhere.invalid"
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58 ```
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59
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60 `pubsub_post_default_actor` is used when trying to publish to a node
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61 that is not listed in `pubsub_post_actors`. Otherwise the IP address
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62 of the connection is used.
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63
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64 ## Authentication
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65
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66 [WebSub](https://www.w3.org/TR/2018/REC-websub-20180123/) [Authenticated
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67 Content
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68 Distribution](https://www.w3.org/TR/2018/REC-websub-20180123/#authenticated-content-distribution)
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69 authentication is used.
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70
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71 ``` {.lua}
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72 pubsub_post_secrets = {
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73 princely_musings = "shared secret"
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74 }
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75 pubsub_post_default_secret = "default secret"
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76 ```
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77
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78 `pubsub_post_default_secret` is used when trying to publish to a node
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79 that is not listed in `pubsub_post_secrets`. Otherwise the request
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80 proceeds with the previously identified actor.
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81
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82 ::: {.alert .alert-danger}
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83 If configured without a secret and a default actor that has permission
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84 to create nodes the service becomes wide open.
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85 :::
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86
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87 ## Authorization
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88
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89 Authorization is handled via pubsub affiliations. Publishing requires an
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90 affiliation with the _publish_ capability, usually `"publisher"`.
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91
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92 ### Setting up affiliations
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93
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94 Prosodys PubSub module supports [setting affiliations via
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95 XMPP](https://xmpp.org/extensions/xep-0060.html#owner-affiliations), in
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96 trunk since [revision
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97 384ef9732b81](https://hg.prosody.im/trunk/rev/384ef9732b81), so
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98 affiliations can be configured with a capable client.
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99
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100 It can however be done from another plugin:
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101
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102 ``` {.lua}
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103 local mod_pubsub = module:depends("pubsub");
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104 local pubsub = mod_pubsub.service;
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105
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106 pubsub:create("princely_musings", true);
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107 pubsub:set_affiliation("princely_musings", true, "127.0.0.1", "publisher");
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108 ```
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109
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110 ## Data mappings
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111
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112 The datamapper library added in trunk allows posting JSON and having it
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113 converted to XML based on a special JSON Schema.
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114
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115 ``` json
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116 {
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117 "properties" : {
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118 "content" : {
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119 "type" : "string"
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120 },
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121 "title" : {
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122 "type" : "string"
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123 }
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124 },
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125 "type" : "object",
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126 "xml" : {
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127 "name" : "musings",
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128 "namespace" : "urn:example:princely"
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129 }
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130 }
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131 ```
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132
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133 And in the Prosody config file:
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134
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135 ``` lua
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136 pubsub_post_mappings = {
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137 princely_musings = "musings.json";
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138 }
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139 ```
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140
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141 Then, POSTing a JSON payload like
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142
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143 ``` json
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144 {
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145 "content" : "To be, or not to be: that is the question",
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146 "title" : "Soliloquy"
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147 }
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148 ```
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149
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150 results in a payload like
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151
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152 ``` xml
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153 <musings xmlns="urn:example:princely">
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154 <title>Soliloquy</title>
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155 <content>To be, or not to be: that is the question</content>
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156 </musings>
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157 ```
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158
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159 being published to the node.