Mercurial > prosody-modules
annotate mod_rest/README.markdown @ 3808:02164f8aebac
mod_rest: Add an example Flask thing
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 01 Jan 2020 12:06:46 +0100 |
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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 --- |
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6 |
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7 # Introduction |
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8 |
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9 This is yet another RESTful API for sending and receiving stanzas via |
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10 Prosody. It can be used to build bots and components implemented as HTTP |
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11 services. |
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12 |
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13 # Usage |
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14 |
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15 ## Enabling |
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16 |
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17 ``` {.lua} |
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18 Component "rest.example.net" "rest" |
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19 rest_credentials = "Bearer dmVyeSBzZWNyZXQgdG9rZW4K" |
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20 ``` |
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21 |
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22 ## Sending stanzas |
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23 |
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24 The API endpoint becomes available at the path `/rest`, so the full URL |
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25 will be something like `https://your-prosody.example:5281/rest`. |
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26 |
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27 To try it, simply `curl` an XML stanza payload: |
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28 |
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29 ``` {.sh} |
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30 curl https://prosody.example:5281/rest \ |
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31 --oauth2-bearer dmVyeSBzZWNyZXQgdG9rZW4K \ |
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32 -H 'Content-Type: application/xmpp+xml' \ |
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33 --data-binary '<message type="chat" to="user@example.org"> |
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34 <body>Hello!</body> |
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35 </body>' |
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36 ``` |
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37 |
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38 The `Content-Type` **MUST** be `application/xmpp+xml`. |
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39 |
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40 ### Replies |
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41 |
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42 A POST containing an `<iq>` stanza automatically wait for the reply, |
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43 long-polling style. |
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44 |
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45 ``` {.sh} |
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46 curl https://prosody.example:5281/rest \ |
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47 --oauth2-bearer dmVyeSBzZWNyZXQgdG9rZW4K \ |
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48 -H 'Content-Type: application/xmpp+xml' \ |
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49 --data-binary '<iq type="get" to="example.net"> |
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50 <ping xmlns="urn:xmpp:ping"/> |
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51 </iq>' |
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52 ``` |
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53 |
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54 Replies to other kinds of stanzas that are generated by the same Prosody |
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55 instance *MAY* be returned in the HTTP response. Replies from other |
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56 entities (connected clients or remote servers) will not be returned, but |
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57 can be forwarded via the callback API described in the next section. |
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58 |
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59 ## Receiving stanzas |
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60 |
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61 TL;DR: Set this webhook callback URL, get XML `POST`-ed there. |
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62 |
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63 ``` {.lua} |
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64 Component "rest.example.net" "rest" |
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65 rest_credentials = "Bearer dmVyeSBzZWNyZXQgdG9rZW4K" |
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66 rest_callback_url = "http://my-api.example:9999/stanzas" |
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67 ``` |
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68 |
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69 Example callback looks like: |
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70 |
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71 ``` {.xml} |
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72 POST /stanzas HTTP/1.1 |
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73 Content-Type: application/xmpp+xml |
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74 Content-Length: 52 |
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75 |
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76 <message to="bot@rest.example.net" from="user@example.com" type="chat"> |
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77 <body>Hello</body> |
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78 </message> |
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79 ``` |
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80 |
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81 ### Replying |
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82 |
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83 To accept the stanza without returning a reply, respond with HTTP status |
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84 code `202` or `204`. |
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85 |
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86 HTTP status codes in the `4xx` and `5xx` range are mapped to an |
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87 appropriate stanza error. |
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88 |
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89 For full control over the response, set the `Content-Type` header to |
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90 `application/xmpp+xml` and return an XMPP stanza as an XML snippet. |
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91 |
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92 ``` {.xml} |
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93 HTTP/1.1 200 Ok |
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94 Content-Type: application/xmpp+xml |
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95 |
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96 <message type="chat"> |
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97 <body>Yes, this is bot</body> |
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98 </message> |
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99 ``` |
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100 |
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101 ## Payload format |
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102 |
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103 ``` {.xml} |
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104 <message type="" id="" to="" from="" xml:lang=""> |
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105 ... |
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106 </message> |
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107 ``` |
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108 |
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109 An XML declaration (`<?xml?>`) **MUST NOT** be included. |
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110 |
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111 The payload MUST contain one (1) `message`, `presence` or `iq` stanza. |
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112 |
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113 The stanzas MUST NOT have an `xmlns` attribute, and the default/empty |
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114 namespace is treated as `jabber:client`. |
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115 |
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116 # Examples |
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117 |
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118 ## Python / Flask |
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119 |
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120 Simple echo bot that responds to messages: |
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121 |
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122 ```python |
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123 from flask import Flask, Response, request |
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124 import xml.etree.ElementTree as ET |
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125 |
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126 app = Flask('echobot') |
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127 |
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128 @app.before_request |
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129 def parse(): |
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130 request.stanza = ET.fromstring(request.data) |
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131 |
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132 @app.route('/', methods = ['POST']) |
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133 def hello(): |
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134 if request.stanza.tag == 'message': |
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135 return Response('<message><body>Yes this is bot</body></message>', content_type='application/xmpp+xml') |
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136 |
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137 return Response(status = 501) |
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138 |
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139 if __name__ == '__main__': |
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140 app.run() |
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141 ``` |
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142 |
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143 # Compatibility |
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144 |
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145 Requires Prosody trunk / 0.12 |