Mercurial > prosody-modules

annotate mod_slack_webhooks/mod_slack_webhooks.lua @ 3000:02fc3b64cbb7

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Initial commit of mod_slack_webhooks. This provides an HTTP-based interface to and from Prosody-hosted MUCs equivalent to Slack's incoming and outgoing webhook interfaces, allowing a variety of Slack integrations to be used with a Prosody MUC.
author Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
date Sun, 15 Apr 2018 08:45:43 -0700
parents
children b6cac9d72255
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3000
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1 -- Allow Slack-style incoming and outgoing hooks to MUC rooms
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2 -- Based on mod_muc_intercom and mod_post_msg
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3 -- Copyright 2016-2017 Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
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4 --
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5 -- This file is MIT/X11 licensed.
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6
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7 module:depends"http"
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8
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9 local host_session = prosody.hosts[module.host];
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10 local msg = require "util.stanza".message;
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11 local jid = require "util.jid";
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12 local now = require "util.datetime".datetime;
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13 local b64_decode = require "util.encodings".base64.decode;
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14 local json = require "util.json"
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15 local formdecode = require "net.http".formdecode;
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16 local xml = require "util.xml";
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17 local http = require "net.http";
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18
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19 local function get_room_by_jid(mod_muc, jid)
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20 if mod_muc.get_room_by_jid then
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21 return mod_muc.get_room_by_jid(jid);
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22 elseif mod_muc.rooms then
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23 return mod_muc.rooms[jid]; -- COMPAT 0.9, 0.10
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24 end
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25 end
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26
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27 local routing = module:get_option("outgoing_webhook_routing") or {};
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28 local listen_path = module:get_option("incoming_webhook_path") or "/webhook";
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29 local default_from_nick = module:get_option("incoming_webhook_default_nick") or "Bot";
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30
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31 function postcallback(content, code)
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32 module:log("debug", "HTTP result %d", code)
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33 end
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34
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35 function check_message(data)
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36 local origin, stanza = data.origin, data.stanza;
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37 local mod_muc = host_session.muc;
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38 if not mod_muc then return; end
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39
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40 local this_room = get_room_by_jid(mod_muc, stanza.attr.to);
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41 if not this_room then return; end -- no such room
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42
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43 local from_room_jid = this_room._jid_nick[stanza.attr.from];
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44 if not from_room_jid then return; end -- no such nick
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45
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46 local from_room, from_host, from_nick = jid.split(from_room_jid);
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47
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48 local body = stanza:get_child("body");
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49 if not body then return; end -- No body, like topic changes
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50 body = body and body:get_text(); -- I feel like I want to do `or ""` there :/
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51
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52 if not routing[from_room] then
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53 return;
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54 end
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55
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56 local json_out = {channel_name = from_room, timestamp = now(), text = body, team_domain = from_host, user_name = from_nick};
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57 local stanzaid = stanza:get_child("id");
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58 if stanzaid and string.sub(stanzaid,1,string.len("webhookbot"))=="webhookbot" then
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59 json_out["bot_id"] = "webhookbot";
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60 end
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61
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62 json_out = json.encode(json_out)
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63 local url = routing[from_room];
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64 module:log("debug", "message from %s in %s to %s", from_nick, from_room, url);
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65 local headers = {
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66 ["Content-Type"] = "application/json",
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67 };
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68 http.request(url, { method = "POST", body = json_out, headers = headers }, postcallback)
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69 end
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70
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71 module:hook("message/bare", check_message, 10);
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72
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73 local function route_post(f)
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74 return function(event, path)
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75 local request = event.request;
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76 local headers = request.headers;
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77 local bare_room = jid.join(path, module.host);
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78 local mod_muc = host_session.muc;
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79 if not get_room_by_jid(mod_muc, bare_room) then
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80 module:log("warn", "mod_slack_webhook: invalid JID: %s", bare_room);
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81 return 404;
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82 end
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83 -- Check secret?
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84 return f(event, path)
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85 end
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86 end
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87
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88 local function handle_post(event, path)
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89 local mod_muc = host_session.muc;
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90 local request = event.request;
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91 local response = event.response;
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92 local headers = request.headers;
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93
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94 local body_type = headers.content_type;
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95 local message;
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96 local post_body;
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97 if body_type == "application/x-www-form-urlencoded" then
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98 post_body = formdecode(request.body)["payload"];
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99 elseif body_type == "application/json" then
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100 if not pcall(function() post_body = json.decode(request.body) end) then
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101 return 420;
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102 end
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103 else
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104 return 422;
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105 end
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106 local bare_room = jid.join(path, module.host);
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107 local dest_room = get_room_by_jid(mod_muc, bare_room);
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108 local from_nick = default_from_nick;
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109 if post_body["username"] then
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110 from_nick = post_body["username"];
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111 end
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112 local sender = jid.join(path, module.host, from_nick);
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113 module:log("debug", "message to %s from %s", bare_room, sender);
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114 module:log("debug", "body: %s", post_body["text"]);
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115 message = msg({ to = bare_room, from = sender, type = "groupchat", id="webhookbot" .. now()},post_body["text"]);
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116 dest_room:broadcast_message(message, true);
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117 return 201;
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118 end
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119
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120 module:provides("http", {
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121 default_path = listen_path;
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122 route = {
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123 ["POST /*"] = route_post(handle_post);
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124 OPTIONS = function(e)
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125 local headers = e.response.headers;
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126 headers.allow = "POST";
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127 headers.accept = "application/x-www-form-urlencoded, application/json";
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
parents:
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128 return 200;
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
parents:
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129 end;
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
parents:
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130 }
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
parents:
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131 });
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
parents:
diff changeset
132