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mod_pubsub_post: Document JSON to XML mapping capability
author Kim Alvefur <zash@zash.se>
date Wed, 29 Dec 2021 23:12:43 +0100
parents 6bcccc63b542
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.