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mod_rest/README.markdown

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mod_rest: Add XEP-0004 mapping for future reuse For use with MAM and such
author Kim Alvefur <zash@zash.se>
date Thu, 04 Nov 2021 19:36:11 +0100
parent 4535:dc35d2932d3e
child 4919:b9f8dd9a7fdb
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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 - res
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12 ---
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13
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14 # Introduction
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15
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16 This is yet another RESTful API for sending and receiving stanzas via
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17 Prosody. It can be used to build bots and components implemented as HTTP
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18 services. It is the spiritual successor to [mod_post_msg] and absorbs
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19 use cases from [mod_http_rest] and [mod_component_http] and other such
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20 modules floating around the Internet.
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21
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22 # Usage
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23
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24 ## On VirtualHosts
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25
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26 ```lua
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27 VirtualHost "example.com"
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28 modules_enabled = {"rest"}
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29 ```
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30
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31 ## As a Component
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32
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33 ``` {.lua}
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34 Component "rest.example.net" "rest"
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35 component_secret = "dmVyeSBzZWNyZXQgdG9rZW4K"
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36 modules_enabled = {"http_oauth2"}
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37 ```
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38
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39 ## OAuth2
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40
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41 [mod_http_oauth2] can be used to grant bearer tokens which are
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42 accepted by mod_rest.
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43
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44 ## Sending stanzas
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45
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46 The API endpoint becomes available at the path `/rest`, so the full URL
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47 will be something like `https://your-prosody.example:5281/rest`.
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48
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49 To try it, simply `curl` an XML stanza payload:
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50
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51 ``` {.sh}
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52 curl https://prosody.example:5281/rest \
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53 --user username \
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54 -H 'Content-Type: application/xmpp+xml' \
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55 --data-binary '<message type="chat" to="user@example.org">
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56 <body>Hello!</body>
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57 </body>'
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58 ```
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59
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60 or a JSON payload:
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61
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62 ``` {.sh}
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63 curl https://prosody.example:5281/rest \
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64 --oauth2-bearer dmVyeSBzZWNyZXQgdG9rZW4K \
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65 -H 'Content-Type: application/json' \
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66 --data-binary '{
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67 "body" : "Hello!",
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68 "kind" : "message",
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69 "to" : "user@example.org",
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70 "type" : "chat"
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71 }'
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72 ```
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73
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74 The `Content-Type` header is important!
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75
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76 ### Parameters in path
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77
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78 New alternative format with the parameters `kind`, `type`, and `to`
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79 embedded in the path:
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80
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81 ```
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82 curl https://prosody.example:5281/rest/message/chat/john@example.com \
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83 --oauth2-bearer dmVyeSBzZWNyZXQgdG9rZW4K \
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84 -H 'Content-Type: text/plain' \
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85 --data-binary 'Hello John!'
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86 ```
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87
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88 ### Replies
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89
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90 A POST containing an `<iq>` stanza automatically wait for the reply,
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91 long-polling style.
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92
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93 ``` {.sh}
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94 curl https://prosody.example:5281/rest \
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95 --oauth2-bearer dmVyeSBzZWNyZXQgdG9rZW4K \
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96 -H 'Content-Type: application/xmpp+xml' \
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97 --data-binary '<iq type="get" to="example.net">
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98 <ping xmlns="urn:xmpp:ping"/>
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99 </iq>'
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100 ```
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101
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102 Replies to other kinds of stanzas that are generated by the same Prosody
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103 instance *MAY* be returned in the HTTP response. Replies from other
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104 entities (connected clients or remote servers) will not be returned, but
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105 can be forwarded via the callback API described in the next section.
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106
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107 ### Simple info queries
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108
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109 A subset of IQ stanzas can be sent as simple GET requests
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110
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111 ```
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112 curl https://prosody.example:5281/rest/version/example.com \
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113 --oauth2-bearer dmVyeSBzZWNyZXQgdG9rZW4K \
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114 -H 'Accept: application/json'
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115 ```
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116
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117 The supported queries are
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118
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119 - `disco`
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120 - `items`
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121 - `version`
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122 - `ping`
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123
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124 ## Receiving stanzas
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125
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126 TL;DR: Set this webhook callback URL, get XML `POST`-ed there.
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127
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128 ``` {.lua}
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129 Component "rest.example.net" "rest"
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130 rest_callback_url = "http://my-api.example:9999/stanzas"
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131 ```
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132
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133 To enable JSON payloads set
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134
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135 ``` {.lua}
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136 rest_callback_content_type = "application/json"
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137 ```
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138
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139 Example callback looks like:
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140
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141 ``` {.xml}
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142 POST /stanzas HTTP/1.1
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143 Content-Type: application/xmpp+xml
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144 Content-Length: 102
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145
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146 <message to="bot@rest.example.net" from="user@example.com" type="chat">
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147 <body>Hello</body>
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148 </message>
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149 ```
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150
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151 or as JSON:
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152
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153 ``` {.json}
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154 POST /stanzas HTTP/1.1
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155 Content-Type: application/json
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156 Content-Length: 133
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157
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158 {
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159 "body" : "Hello",
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160 "from" : "user@example.com",
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161 "kind" : "message",
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162 "to" : "bot@rest.example.net",
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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 ### Replying
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168
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169 To accept the stanza without returning a reply, respond with HTTP status
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170 code `202` or `204`.
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171
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172 HTTP status codes in the `4xx` and `5xx` range are mapped to an
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173 appropriate stanza error.
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174
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175 For full control over the response, set the `Content-Type` header to
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176 `application/xmpp+xml` and return an XMPP stanza as an XML snippet.
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177
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178 ``` {.xml}
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179 HTTP/1.1 200 Ok
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180 Content-Type: application/xmpp+xml
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181
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182 <message type="chat">
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183 <body>Yes, this is bot</body>
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184 </message>
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185 ```
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186
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187 ## Payload format
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188
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189 ### JSON
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190
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191 ``` {.json}
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192 {
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193 "body" : "Hello!",
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194 "kind" : "message",
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195 "type" : "chat"
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196 }
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197 ```
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198
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199 Further JSON object keys as follows:
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200
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201 #### Messages
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202
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203 `kind`
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204 : `"message"`
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205
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206 `type`
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207 : Commonly `"chat"` for 1-to-1 messages and `"groupchat"` for group
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208 chat messages. Others include `"normal"`, `"headline"` and
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209 `"error"`.
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210
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211 `body`
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212 : Human-readable message text.
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213
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214 `subject`
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215 : Message subject or MUC topic.
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216
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217 `html`
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218 : HTML.
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219
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220 `oob_url`
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221 : URL of an out-of-band resource, often used for images.
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222
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223 #### Presence
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224
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225 `kind`
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226 : `"presence"`
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227
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228 `type`
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229 : Empty for online or `"unavailable"` for offline.
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230
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231 `show`
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232 : [Online
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233 status](https://xmpp.org/rfcs/rfc6121.html#presence-syntax-children-show),
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234 `away`, `dnd` etc.
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235
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236 `status`
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237 : Human-readable status message.
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238
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239 `join`
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240 : Boolean. Join a group chat.
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241
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242 #### Info-Queries
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243
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244 Only one type of payload can be included in an `iq`.
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245
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246 `kind`
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247 : `"iq"`
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248
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249 `type`
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250 : `"get"` or `"set"` for queries, `"response"` or `"error"` for
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251 replies.
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252
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253 `ping`
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254 : Send a ping. Get a pong. Maybe.
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255
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256 `disco`
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257 : Retrieve service discovery information about an entity.
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258
3828
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259 `items`
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260 : Discover list of items (other services, groupchats etc).
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261
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262 ### XML
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263
3800
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264 ``` {.xml}
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265 <message type="" id="" to="" from="" xml:lang="">
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266 ...
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267 </message>
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268 ```
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269
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270 An XML declaration (`<?xml?>`) **MUST NOT** be included.
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271
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272 The payload MUST contain one (1) `message`, `presence` or `iq` stanza.
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273
3801
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274 The stanzas MUST NOT have an `xmlns` attribute, and the default/empty
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275 namespace is treated as `jabber:client`.
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276
3808
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277 # Examples
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278
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279 ## Python / Flask
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280
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281 Simple echo bot that responds to messages as XML:
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282
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283 ``` {.python}
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284 from flask import Flask, Response, request
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285 import xml.etree.ElementTree as ET
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286
3809
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287 app = Flask("echobot")
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288
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289
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290 @app.before_request
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291 def parse():
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292 request.stanza = ET.fromstring(request.data)
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293
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294
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295 @app.route("/", methods=["POST"])
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296 def hello():
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297 if request.stanza.tag == "message":
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298 return Response(
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299 "<message><body>Yes this is bot</body></message>",
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300 content_type="application/xmpp+xml",
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301 )
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302
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303 return Response(status=501)
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304
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305
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306 if __name__ == "__main__":
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307 app.run()
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308 ```
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309
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310 And a JSON variant:
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311
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312 ``` {.python}
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313 from flask import Flask, Response, request, jsonify
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314
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315 app = Flask("echobot")
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316
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317
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318 @app.route("/", methods=["POST"])
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319 def hello():
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320 print(request.data)
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321 if request.is_json:
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322 data = request.get_json()
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323 if data["kind"] == "message":
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324 return jsonify({"body": "hello"})
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325
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326 return Response(status=501)
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327
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328
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329 if __name__ == "__main__":
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330 app.run()
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331 ```
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332
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333 Remember to set `rest_callback_content_type = "application/json"` for
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334 this to work.
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335
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336 # JSON mapping
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337
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338 This section describes the JSON mapping. It can't represent any possible
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339 stanza, for full flexibility use the XML mode.
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340
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341 ## Stanza basics
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342
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343 `kind`
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344 : String representing the kind of stanza, one of `"message"`,
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345 `"presence"` or `"iq"`.
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346
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347 `type`
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348 : String with the type of stanza, appropriate values vary depending on
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349 `kind`, see [RFC 6121]. E.g.`"chat"` for *message* stanzas etc.
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350
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351 `to`
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352 : String containing the XMPP Address of the destination / recipient of
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353 the stanza.
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354
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355 `from`
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356 : String containing the XMPP Address of the sender the stanza.
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357
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358 `id`
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359 : String with a reasonably unique identifier for the stanza.
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360
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361 ## Basic Payloads
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362
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363 ### Messages
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364
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365 `body`
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366 : String, human readable text message.
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367
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368 `subject`
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369 : String, human readable summary equivalent to an email subject or the
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370 chat room topic in a `type:groupchat` message.
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371
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372 ### Presence
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373
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374 `show`
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375 : String representing availability, e.g. `"away"`, `"dnd"`. No value
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376 means a normal online status. See [RFC 6121] for the full list.
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377
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378 `status`
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379 : String with a human readable text message describing availability.
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380
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381 ## More payloads
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382
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383 ### Messages
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384
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385 `state`
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386 : String with current chat state, e.g. `"active"` (default) and
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387 `"composing"` (typing).
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388
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389 `html`
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390 : String with HTML allowing rich formatting. **MUST** be contained in a
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391 `<body>` element.
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392
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393 `oob_url`
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394 : String with an URL of an external resource.
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395
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396 ### Presence
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397
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398 `join`
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399 : Boolean, used to join group chats.
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400
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401 ### IQ
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402
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403 `ping`
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404 : Boolean, a simple ping query. "Pongs" have only basic fields
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405 presents.
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406
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407 `version`
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408 : Map with `name`, `version` fields, and optionally an `os` field, to
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409 describe the software.
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410
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411 #### Service Discovery
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412
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413 `disco`
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414
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415 : Boolean `true` in a `kind:iq` `type:get` for a service discovery
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416 query.
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417
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418 Responses have a map containing an array of available features in
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419 the `features` key and an array of "identities" in the `identities`
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420 key. Each identity has a `category` and `type` field as well as an
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421 optional `name` field. See [XEP-0030] for further details.
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422
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423 `items`
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424 : Boolean `true` in a `kind:iq` `type:get` for a service discovery
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425 items list query. The response contain an array of items like
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426 `{"jid":"xmpp.address.here","name":"Description of item"}`.
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427
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428 `extensions`
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429 : Map of extended feature discovery (see [XEP-0128]) data with
2c6d5734ae04 mod_rest: Add JSON mapping of XEP-0128: Service Discovery Extensions
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430 `FORM_DATA` fields as the keys pointing at maps with the rest of the
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431 data.
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432
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433 #### Ad-Hoc Commands
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434
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435 Used to execute arbitrary commands on supporting entities.
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436
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437 `command`
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438
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439 : String representing the command `node` or Map with the following
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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440 possible fields:
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441
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442 `node`
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443 : Required string with node from disco\#items query for the
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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444 command to execute.
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445
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446 `action`
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447 : Optional enum string defaulting to `"execute"`. Multi-step
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448 commands may involve `"next"`, `"prev"`, `"complete"` or
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449 `"cancel"`.
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450
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451 `actions`
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452 : Set (map of strings to `true`) with available actions to proceed
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453 with in multi-step commands.
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454
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455 `status`
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456 : String describing the status of the command, normally
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457 `"executing"`.
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458
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459 `sessionid`
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460 : Random session ID issued by the responder to identify the
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461 session in multi-step commands.
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462
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463 `note`
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464 : Map with `"type"` and `"text"` fields that carry simple result
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465 information.
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466
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467 `form`
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468 : Data form with description of expected input and data types in
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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469 the next step of multi-step commands. **TODO** document format.
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470
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471 `data`
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472 : Map with only the data for result dataforms. Fields may be
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diff changeset
473 strings or arrays of strings.
3890
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474
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475 ##### Example
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476
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477 Discovering commands:
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478
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479 ``` {.json}
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480 {
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481 "items" : {
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482 "node" : "http://jabber.org/protocol/commands"
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483 },
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484 "id" : "8iN9hwdAAcfTBchm",
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485 "kind" : "iq",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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486 "to" : "example.com",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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487 "type" : "get"
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488 }
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489 ```
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490
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491 Response:
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492
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493 ``` {.json}
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494 {
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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495 "from" : "example.com",
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496 "id" : "8iN9hwdAAcfTBchm",
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497 "items" : [
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498 {
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parents: 3857
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499 "jid" : "example.com",
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500 "name" : "Get uptime",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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501 "node" : "uptime"
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Kim Alvefur <zash@zash.se>
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diff changeset
502 }
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parents: 3857
diff changeset
503 ],
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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504 "kind" : "iq",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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diff changeset
505 "type" : "result"
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parents: 3857
diff changeset
506 }
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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507 ```
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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diff changeset
508
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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509 Execute the command:
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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510
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511 ``` {.json}
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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512 {
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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513 "command" : {
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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parents: 3857
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514 "node" : "uptime"
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
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515 },
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
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516 "id" : "Jv-87nRaP6Mnrp8l",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
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517 "kind" : "iq",
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518 "to" : "example.com",
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519 "type" : "set"
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Kim Alvefur <zash@zash.se>
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520 }
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
521 ```
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
522
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Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
523 Executed:
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
524
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
525 ``` {.json}
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
526 {
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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diff changeset
527 "command" : {
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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diff changeset
528 "node" : "uptime",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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diff changeset
529 "note" : {
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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diff changeset
530 "text" : "This server has been running for 0 days, 20 hours and 54 minutes (since Fri Feb 7 18:05:30 2020)",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
531 "type" : "info"
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
532 },
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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parents: 3857
diff changeset
533 "sessionid" : "6380880a-93e9-4f13-8ee2-171927a40e67",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
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diff changeset
534 "status" : "completed"
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
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535 },
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
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536 "from" : "example.com",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
537 "id" : "Jv-87nRaP6Mnrp8l",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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538 "kind" : "iq",
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
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539 "type" : "result"
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
540 }
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
541 ```
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
Kim Alvefur <zash@zash.se>
parents: 3857
diff changeset
542
4275
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Kim Alvefur <zash@zash.se>
parents: 4168
diff changeset
543 # TODO
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Kim Alvefur <zash@zash.se>
parents: 4168
diff changeset
544
bb111148d031 mod_rest: Expand TODO
Kim Alvefur <zash@zash.se>
parents: 4168
diff changeset
545 - Describe multi-step commands with dataforms.
bb111148d031 mod_rest: Expand TODO
Kim Alvefur <zash@zash.se>
parents: 4168
diff changeset
546 - Versioned API, i.e. /v1/stanzas
bb111148d031 mod_rest: Expand TODO
Kim Alvefur <zash@zash.se>
parents: 4168
diff changeset
547 - Bind resource to webhook/callback
3890
117a979ef930 mod_rest/README: Describe Ad-Hoc command mapping
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diff changeset
548
3794
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diff changeset
549 # Compatibility
4b258329e6e4 mod_rest: Initial commit of another RESTful API module
Kim Alvefur <zash@zash.se>
parents:
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550
4b258329e6e4 mod_rest: Initial commit of another RESTful API module
Kim Alvefur <zash@zash.se>
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diff changeset
551 Requires Prosody trunk / 0.12