Annotate

mod_rest/README.markdown @ 4421:94805a7e7b30

mod_invites: rework CLI parsing to support groups To make this sensible, the code had to move from rather simple parsing to something which looks more like getopt or your typical shell script.
author Jonas Schäfer <jonas@wielicki.name>
date Sun, 31 Jan 2021 19:16:36 +0100
parent 4275:bb111148d031
child 4477:8df6cc648963
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 summary: RESTful XMPP API
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5 rockspec:
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6 build:
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7 modules:
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8 mod_rest.jsonmap: jsonmap.lib.lua
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9 copy_directories:
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10 - example
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11 ---
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12
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13 # Introduction
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14
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15 This is yet another RESTful API for sending and receiving stanzas via
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16 Prosody. It can be used to build bots and components implemented as HTTP
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17 services.
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18
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19 # Usage
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20
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21 ## On VirtualHosts
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22
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23 ```lua
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24 VirtualHost "example.com"
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25 modules_enabled = {"rest"}
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26 ```
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27
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28 ## As a Component
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29
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30 ``` {.lua}
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31 Component "rest.example.net" "rest"
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32 component_secret = "dmVyeSBzZWNyZXQgdG9rZW4K"
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33 modules_enabled = {"http_oauth2"}
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34 ```
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35
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36 ## OAuth2
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37
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38 [mod_http_oauth2] can be used to grant bearer tokens which are
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39 accepted by mod_rest.
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40
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41 ## Sending stanzas
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42
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43 The API endpoint becomes available at the path `/rest`, so the full URL
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44 will be something like `https://your-prosody.example:5281/rest`.
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45
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46 To try it, simply `curl` an XML stanza payload:
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47
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48 ``` {.sh}
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49 curl https://prosody.example:5281/rest \
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50 --user username \
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51 -H 'Content-Type: application/xmpp+xml' \
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52 --data-binary '<message type="chat" to="user@example.org">
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53 <body>Hello!</body>
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54 </body>'
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55 ```
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56
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57 or a JSON payload:
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58
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59 ``` {.sh}
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60 curl https://prosody.example:5281/rest \
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61 --oauth2-bearer dmVyeSBzZWNyZXQgdG9rZW4K \
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62 -H 'Content-Type: application/json' \
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63 --data-binary '{
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64 "body" : "Hello!",
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65 "kind" : "message",
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66 "to" : "user@example.org",
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67 "type" : "chat"
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68 }'
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69 ```
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70
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71 The `Content-Type` header is important!
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72
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73 ### Replies
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74
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75 A POST containing an `<iq>` stanza automatically wait for the reply,
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76 long-polling style.
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77
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78 ``` {.sh}
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79 curl https://prosody.example:5281/rest \
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80 --oauth2-bearer dmVyeSBzZWNyZXQgdG9rZW4K \
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81 -H 'Content-Type: application/xmpp+xml' \
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82 --data-binary '<iq type="get" to="example.net">
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83 <ping xmlns="urn:xmpp:ping"/>
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84 </iq>'
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85 ```
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86
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87 Replies to other kinds of stanzas that are generated by the same Prosody
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88 instance *MAY* be returned in the HTTP response. Replies from other
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89 entities (connected clients or remote servers) will not be returned, but
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90 can be forwarded via the callback API described in the next section.
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91
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92 ## Receiving stanzas
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93
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94 TL;DR: Set this webhook callback URL, get XML `POST`-ed there.
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95
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96 ``` {.lua}
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97 Component "rest.example.net" "rest"
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98 rest_callback_url = "http://my-api.example:9999/stanzas"
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99 ```
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100
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101 To enable JSON payloads set
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102
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103 ``` {.lua}
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104 rest_callback_content_type = "application/json"
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105 ```
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106
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107 Example callback looks like:
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108
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109 ``` {.xml}
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110 POST /stanzas HTTP/1.1
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111 Content-Type: application/xmpp+xml
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112 Content-Length: 102
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113
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114 <message to="bot@rest.example.net" from="user@example.com" type="chat">
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115 <body>Hello</body>
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116 </message>
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117 ```
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118
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119 or as JSON:
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120
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121 ``` {.json}
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122 POST /stanzas HTTP/1.1
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123 Content-Type: application/json
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124 Content-Length: 133
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125
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126 {
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127 "body" : "Hello",
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128 "from" : "user@example.com",
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129 "kind" : "message",
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130 "to" : "bot@rest.example.net",
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131 "type" : "chat"
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132 }
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133 ```
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134
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135 ### Replying
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136
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137 To accept the stanza without returning a reply, respond with HTTP status
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138 code `202` or `204`.
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139
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140 HTTP status codes in the `4xx` and `5xx` range are mapped to an
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141 appropriate stanza error.
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142
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143 For full control over the response, set the `Content-Type` header to
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144 `application/xmpp+xml` and return an XMPP stanza as an XML snippet.
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145
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146 ``` {.xml}
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147 HTTP/1.1 200 Ok
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148 Content-Type: application/xmpp+xml
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149
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150 <message type="chat">
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151 <body>Yes, this is bot</body>
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152 </message>
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153 ```
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154
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155 ## Payload format
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156
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157 ### JSON
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158
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159 ``` {.json}
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160 {
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161 "body" : "Hello!",
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162 "kind" : "message",
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163 "type" : "chat"
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164 }
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165 ```
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166
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167 Further JSON object keys as follows:
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168
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169 #### Messages
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170
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171 `kind`
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172 : `"message"`
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173
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174 `type`
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175 : Commonly `"chat"` for 1-to-1 messages and `"groupchat"` for group
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176 chat messages. Others include `"normal"`, `"headline"` and
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177 `"error"`.
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178
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179 `body`
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180 : Human-readable message text.
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181
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182 `subject`
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183 : Message subject or MUC topic.
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184
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185 `html`
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186 : HTML.
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187
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188 `oob_url`
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189 : URL of an out-of-band resource, often used for images.
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190
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191 #### Presence
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192
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193 `kind`
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194 : `"presence"`
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195
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196 `type`
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197 : Empty for online or `"unavailable"` for offline.
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198
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199 `show`
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200 : [Online
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201 status](https://xmpp.org/rfcs/rfc6121.html#presence-syntax-children-show),
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202 `away`, `dnd` etc.
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203
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204 `status`
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205 : Human-readable status message.
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206
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207 `join`
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208 : Boolean. Join a group chat.
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209
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210 #### Info-Queries
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211
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212 Only one type of payload can be included in an `iq`.
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213
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214 `kind`
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215 : `"iq"`
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216
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217 `type`
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218 : `"get"` or `"set"` for queries, `"response"` or `"error"` for
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219 replies.
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220
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221 `ping`
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222 : Send a ping. Get a pong. Maybe.
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223
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224 `disco`
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225 : Retrieve service discovery information about an entity.
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226
3828
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227 `items`
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228 : Discover list of items (other services, groupchats etc).
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229
3813
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230 ### XML
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231
3800
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232 ``` {.xml}
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233 <message type="" id="" to="" from="" xml:lang="">
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234 ...
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235 </message>
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236 ```
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237
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238 An XML declaration (`<?xml?>`) **MUST NOT** be included.
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239
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240 The payload MUST contain one (1) `message`, `presence` or `iq` stanza.
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241
3801
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242 The stanzas MUST NOT have an `xmlns` attribute, and the default/empty
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243 namespace is treated as `jabber:client`.
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244
3808
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245 # Examples
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246
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247 ## Python / Flask
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248
3820
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249 Simple echo bot that responds to messages as XML:
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250
3813
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251 ``` {.python}
3808
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252 from flask import Flask, Response, request
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253 import xml.etree.ElementTree as ET
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254
3809
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255 app = Flask("echobot")
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256
3808
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257
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258 @app.before_request
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259 def parse():
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260 request.stanza = ET.fromstring(request.data)
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261
3809
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262
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263 @app.route("/", methods=["POST"])
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264 def hello():
3809
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265 if request.stanza.tag == "message":
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266 return Response(
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267 "<message><body>Yes this is bot</body></message>",
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268 content_type="application/xmpp+xml",
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269 )
3808
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270
3809
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271 return Response(status=501)
3808
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272
3809
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273
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274 if __name__ == "__main__":
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275 app.run()
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276 ```
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277
3820
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278 And a JSON variant:
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279
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280 ``` {.python}
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281 from flask import Flask, Response, request, jsonify
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282
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283 app = Flask("echobot")
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284
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285
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286 @app.route("/", methods=["POST"])
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287 def hello():
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288 print(request.data)
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289 if request.is_json:
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290 data = request.get_json()
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291 if data["kind"] == "message":
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292 return jsonify({"body": "hello"})
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293
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294 return Response(status=501)
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295
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296
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297 if __name__ == "__main__":
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298 app.run()
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299 ```
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300
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301 Remember to set `rest_callback_content_type = "application/json"` for
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302 this to work.
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303
3857
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304 # JSON mapping
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305
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306 This section describes the JSON mapping. It can't represent any possible
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307 stanza, for full flexibility use the XML mode.
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308
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309 ## Stanza basics
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310
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311 `kind`
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312 : String representing the kind of stanza, one of `"message"`,
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313 `"presence"` or `"iq"`.
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314
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315 `type`
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316 : String with the type of stanza, appropriate values vary depending on
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317 `kind`, see [RFC 6121]. E.g.`"chat"` for *message* stanzas etc.
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318
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319 `to`
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320 : String containing the XMPP Address of the destination / recipient of
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321 the stanza.
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322
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323 `from`
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324 : String containing the XMPP Address of the sender the stanza.
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325
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326 `id`
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327 : String with a reasonably unique identifier for the stanza.
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328
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329 ## Basic Payloads
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330
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331 ### Messages
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332
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333 `body`
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334 : String, human readable text message.
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335
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336 `subject`
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337 : String, human readable summary equivalent to an email subject or the
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338 chat room topic in a `type:groupchat` message.
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339
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340 ### Presence
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341
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342 `show`
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343 : String representing availability, e.g. `"away"`, `"dnd"`. No value
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344 means a normal online status. See [RFC 6121] for the full list.
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345
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346 `status`
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347 : String with a human readable text message describing availability.
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348
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349 ## More payloads
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350
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351 ### Messages
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352
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353 `state`
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354 : String with current chat state, e.g. `"active"` (default) and
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355 `"composing"` (typing).
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356
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357 `html`
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358 : String with HTML allowing rich formating. **MUST** be contained in a
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359 `<body>` element.
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360
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361 `oob_url`
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362 : String with an URL of an external resource.
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363
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364 ### Presence
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365
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366 `join`
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367 : Boolean, used to join group chats.
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368
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369 ### IQ
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370
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371 `ping`
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372 : Boolean, a simple ping query. "Pongs" have only basic fields
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373 presents.
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374
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375 `version`
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376 : Map with `name`, `version` fields, and optionally an `os` field, to
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377 describe the software.
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378
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379 #### Service Discovery
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380
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381 `disco`
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382
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383 : Boolean `true` in a `kind:iq` `type:get` for a service discovery
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384 query.
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385
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386 Responses have a map containing an array of available features in
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387 the `features` key and an array of "identities" in the `identities`
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388 key. Each identity has a `category` and `type` field as well as an
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389 optional `name` field. See [XEP-0030] for further details.
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390
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391 `items`
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392 : Boolean `true` in a `kind:iq` `type:get` for a service discovery
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393 items list query. The response contain an array of items like
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394 `{"jid":"xmpp.address.here","name":"Description of item"}`.
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395
3953
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396 `extensions`
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397 : Map of extended feature discovery (see [XEP-0128]) data with
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398 `FORM_DATA` fields as the keys pointing at maps with the rest of the
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399 data.
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400
3890
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401 #### Ad-Hoc Commands
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402
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403 Used to execute arbitrary commands on supporting entities.
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404
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405 `command`
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406
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407 : String representing the command `node` or Map with the following
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408 possible fields:
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409
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410 `node`
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411 : Required string with node from disco\#items query for the
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412 command to execute.
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413
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414 `action`
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415 : Optional enum string defaulting to `"execute"`. Multi-step
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416 commands may involve `"next"`, `"prev"`, `"complete"` or
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417 `"cancel"`.
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418
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419 `actions`
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420 : Set (map of strings to `true`) with available actions to proceed
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421 with in multi-step commands.
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422
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423 `status`
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424 : String describing the status of the command, normally
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425 `"executing"`.
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426
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427 `sessionid`
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428 : Random session ID issued by the responder to identify the
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429 session in multi-step commands.
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430
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431 `note`
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432 : Map with `"type"` and `"text"` fields that carry simple result
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433 information.
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434
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435 `form`
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436 : Data form with description of expected input and data types in
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437 the next step of multi-step commands. **TODO** document format.
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438
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439 `data`
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440 : Map with only the data for result dataforms. Fields may be
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441 stings or arrays of strings.
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442
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443 ##### Example
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444
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445 Discovering commands:
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446
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447 ``` {.json}
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448 {
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449 "items" : {
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450 "node" : "http://jabber.org/protocol/commands"
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451 },
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452 "id" : "8iN9hwdAAcfTBchm",
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453 "kind" : "iq",
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454 "to" : "example.com",
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455 "type" : "get"
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456 }
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457 ```
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458
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459 Response:
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460
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461 ``` {.json}
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462 {
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463 "from" : "example.com",
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464 "id" : "8iN9hwdAAcfTBchm",
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465 "items" : [
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466 {
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467 "jid" : "example.com",
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468 "name" : "Get uptime",
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469 "node" : "uptime"
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470 }
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471 ],
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472 "kind" : "iq",
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473 "type" : "result"
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474 }
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475 ```
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476
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477 Execute the command:
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478
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479 ``` {.json}
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480 {
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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481 "command" : {
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482 "node" : "uptime"
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483 },
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484 "id" : "Jv-87nRaP6Mnrp8l",
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485 "kind" : "iq",
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486 "to" : "example.com",
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487 "type" : "set"
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488 }
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489 ```
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490
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491 Executed:
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492
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493 ``` {.json}
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494 {
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495 "command" : {
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496 "node" : "uptime",
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497 "note" : {
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498 "text" : "This server has been running for 0 days, 20 hours and 54 minutes (since Fri Feb 7 18:05:30 2020)",
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499 "type" : "info"
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500 },
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501 "sessionid" : "6380880a-93e9-4f13-8ee2-171927a40e67",
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502 "status" : "completed"
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503 },
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504 "from" : "example.com",
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505 "id" : "Jv-87nRaP6Mnrp8l",
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506 "kind" : "iq",
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507 "type" : "result"
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508 }
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509 ```
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510
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511 # TODO
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512
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513 - Describe multi-step commands with dataforms.
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514 - Versioned API, i.e. /v1/stanzas
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515 - Bind resource to webhook/callback
3890
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516
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517 # Compatibility
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518
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519 Requires Prosody trunk / 0.12