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annotate mod_slack_webhooks/mod_slack_webhooks.lua @ 3812:f027b8b1e794

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mod_rest: Factor out serialization of outgoing stanzas More preparation for content negotiation
author Kim Alvefur <zash@zash.se>
date Wed, 01 Jan 2020 16:19:10 +0100
parents 284d8c18060e
children 724003f24308
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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 msg = require "util.stanza".message;
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10 local jid = require "util.jid";
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11 local now = require "util.datetime".datetime;
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12 local json = require "util.json"
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13 local formdecode = require "net.http".formdecode;
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14 local http = require "net.http";
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15 local dataform = require "util.dataforms";
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16
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17 local mod_muc = module:depends"muc";
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18 local rooms = rawget(mod_muc, "rooms");
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19 local get_room_from_jid = rawget(mod_muc, "get_room_from_jid") or
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20 function (room_jid)
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21 return rooms[room_jid];
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22 end
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23
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24 local button_ns = "xmpp:prosody.im/community/mod_slack_webhooks#buttons";
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25 local routing = module:get_option("outgoing_webhook_routing") or {};
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26 local listen_path = module:get_option("incoming_webhook_path") or "/webhook";
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27 local default_from_nick = module:get_option("incoming_webhook_default_nick") or "Bot";
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28
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29 function postcallback(_, code)
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30 module:log("debug", "HTTP result %d", code)
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31 end
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32
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33 function check_message(data)
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34 local stanza = data.stanza;
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36 local this_room = get_room_from_jid(stanza.attr.to);
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37 if not this_room then return; end -- no such room
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38
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39 local from_room_jid = this_room._jid_nick[stanza.attr.from];
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40 if not from_room_jid then return; end -- no such nick
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41
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42 local from_room, from_host, from_nick = jid.split(from_room_jid);
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43
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44 local body = stanza:get_child("body");
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45 if not body then return; end -- No body, like topic changes
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46 body = body and body:get_text(); -- I feel like I want to do `or ""` there :/
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47
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48 if not routing[from_room] then
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49 return;
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50 end
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51
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52 local json_out = {
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53 channel_name = from_room,
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54 timestamp = now(),
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55 text = body,
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56 team_domain = from_host,
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57 user_name = from_nick,
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58 };
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59
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60 local form = stanza:get_child("x", "jabber:x:form");
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61 if form and form.attr.type == "submit" then
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62 local callback_id, button_name, button_value;
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63 for field in form:childtags("field") do
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64 if field.attr.var == "callback_id" then
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65 button_name = field:get_child_text("text");
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66 elseif field.attr.var == "button_name" then
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67 button_name = field:get_child_text("text");
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68 elseif field.attr.var ~= "FORM_TYPE" or field:get_child_text("text") ~= button_ns then
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69 callback_id, button_name, button_value = nil, nil, nil;
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70 break;
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71 end
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72 end
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73 if callback_id and button_name and button_value then
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74 json_out.callback_id = callback_id;
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75 json_out.actions = {
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76 { type = "button", name = button_name, value = button_value }
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77 };
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78 end
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79 end
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80
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81 local stanzaid = stanza:get_child("id");
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82 if stanzaid and string.sub(stanzaid,1,string.len("webhookbot"))=="webhookbot" then
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83 json_out["bot_id"] = "webhookbot";
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84 end
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85
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86 json_out = json.encode(json_out)
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87 local url = routing[from_room];
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88 module:log("debug", "message from %s in %s to %s", from_nick, from_room, url);
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89 if url == "DEBUG" then
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90 module:log("debug", "json_out = %s", json_out);
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91 return;
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92 end
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93 local headers = {
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94 ["Content-Type"] = "application/json",
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95 };
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96 http.request(url, { method = "POST", body = json_out, headers = headers }, postcallback)
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97 end
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98
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99 module:hook("message/bare", check_message, 10);
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100
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101 local function route_post(f)
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102 return function(event, path)
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103 local bare_room = jid.join(path, module.host);
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104 if not get_room_from_jid(bare_room) then
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105 module:log("warn", "mod_slack_webhook: invalid JID: %s", bare_room);
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106 return 404;
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107 end
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108 -- Check secret?
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109 return f(event, path)
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110 end
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111 end
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112
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113 local function handle_post(event, path)
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114 local request = event.request;
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115 local headers = request.headers;
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116
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117 local body_type = headers.content_type;
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118 local post_body;
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119 if body_type == "application/x-www-form-urlencoded" then
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120 post_body = formdecode(request.body);
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121 elseif body_type == "application/json" then
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122 post_body = json.decode(request.body)
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123 if not post_body then
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124 return 420;
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125 end
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126 else
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127 return 422;
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128 end
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129 local bare_room = jid.join(path, module.host);
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130 local dest_room = get_room_from_jid(bare_room);
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131 local from_nick = default_from_nick;
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132 if post_body["username"] then
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133 from_nick = post_body["username"];
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134 end
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135 local sender = jid.join(path, module.host, from_nick);
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136 module:log("debug", "message to %s from %s", bare_room, sender);
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137 module:log("debug", "body: %s", post_body["text"]);
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138 local message = msg({ to = bare_room, from = sender, type = "groupchat", id="webhookbot" .. now()},post_body["text"]);
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139
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140 if type(post_body["attachments"]) == "table" then -- Buttons?
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141 -- luacheck: ignore 631
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142 -- defensive against JSON having whatever data in it, enjoy
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143
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144 for _, attachment in ipairs(post_body["attachments"]) do
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145 if type(attachment) == "table" and type(attachment.actions) == "table" and type(attachment.callback_id) == "string" then
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146 local buttons = {};
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147 local button_name;
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148 for _, action in ipairs(attachment.actions) do
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149 if type(attachment.text) == "string" then
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150 buttons.label = attachment.text;
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151 end
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152 if type(action) == "table" and action.type == "button" and type(action.name) == "string" and type(action.value) == "string" then
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153 if not button_name then
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154 button_name = action.name;
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155 end
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156 if button_name == action.name then
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157 local button = {
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158 value = action.value;
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159 };
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160 if type(action.text) == "string" then
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161 button.label = action.text;
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162 end
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163 table.insert(buttons, button);
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164 end
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165 end
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166 end
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167 if button_name then
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168 message:add_direct_child(dataform.new({
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169 {
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170 type = "hidden", name = "FORM_TYPE",
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171 value = button_ns,
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172 },
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173 {
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174 type = "hidden", name = "callback_id",
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175 value = attachment.callback_id,
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176 },
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177 {
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178 type = "hidden", name = "button_name",
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179 value = button_name,
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180 },
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181 {
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182 type = "list-single", name = "buttons",
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183 value = "", -- FIXME util.dataforms can't do options without a value
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184 options = buttons;
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185 }
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186 }):form());
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187 break;
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188 end
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189 end
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190 end
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diff changeset
191 end
3000
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
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parents:
diff changeset
192 dest_room:broadcast_message(message, true);
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parents:
diff changeset
193 return 201;
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
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parents:
diff changeset
194 end
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parents:
diff changeset
195
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
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parents:
diff changeset
196 module:provides("http", {
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parents:
diff changeset
197 default_path = listen_path;
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parents:
diff changeset
198 route = {
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parents:
diff changeset
199 ["POST /*"] = route_post(handle_post);
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parents:
diff changeset
200 OPTIONS = function(e)
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parents:
diff changeset
201 local headers = e.response.headers;
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parents:
diff changeset
202 headers.allow = "POST";
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parents:
diff changeset
203 headers.accept = "application/x-www-form-urlencoded, application/json";
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parents:
diff changeset
204 return 200;
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
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parents:
diff changeset
205 end;
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
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parents:
diff changeset
206 }
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
parents:
diff changeset
207 });
02fc3b64cbb7 Initial commit of mod_slack_webhooks.
Nathan Whitehorn <nwhitehorn@physics.ucla.edu>
parents:
diff changeset
208