annotate mod_pubsub_post/README.markdown @ 5424:b45d9a81b3da

mod_http_oauth2: Revert role selector, going to try something else Back out f2c7bb3af600 Allowing only a single role to be encoded into the grant takes away the possibility of having multiple roles in the grant, one of which is selected when issuing an access token. It also takes away the ability to have zero roles granted, which could be useful e.g. when you only need OIDC scopes.
author Kim Alvefur <zash@zash.se>
date Sun, 07 May 2023 19:40:57 +0200
parents 18774cc621d6
children
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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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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),
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96 since 0.11.0, so affiliations can be configured with a capable client.
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97
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98 It can however be done from another plugin:
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99
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100 ``` {.lua}
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101 local mod_pubsub = module:depends("pubsub");
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102 local pubsub = mod_pubsub.service;
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103
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104 pubsub:create("princely_musings", true);
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105 pubsub:set_affiliation("princely_musings", true, "127.0.0.1", "publisher");
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106 ```
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107
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108 ## Data mappings
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109
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110 The datamapper library added in 0.12.0 allows posting JSON and having it
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111 converted to XML based on a special JSON Schema.
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112
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113 ``` json
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114 {
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115 "properties" : {
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116 "content" : {
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117 "type" : "string"
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118 },
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119 "title" : {
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120 "type" : "string"
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121 }
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122 },
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123 "type" : "object",
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124 "xml" : {
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125 "name" : "musings",
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126 "namespace" : "urn:example:princely"
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127 }
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128 }
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129 ```
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130
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131 And in the Prosody config file:
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132
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133 ``` lua
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134 pubsub_post_mappings = {
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135 princely_musings = "musings.json";
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136 }
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137 ```
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138
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139 Then, POSTing a JSON payload like
8d4b91a703af mod_pubsub_post: Document JSON to XML mapping capability
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140
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141 ``` json
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142 {
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143 "content" : "To be, or not to be: that is the question",
8d4b91a703af mod_pubsub_post: Document JSON to XML mapping capability
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144 "title" : "Soliloquy"
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145 }
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146 ```
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147
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148 results in a payload like
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149
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150 ``` xml
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151 <musings xmlns="urn:example:princely">
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152 <title>Soliloquy</title>
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153 <content>To be, or not to be: that is the question</content>
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154 </musings>
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155 ```
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156
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157 being published to the node.