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annotate mod_rest/mod_rest.lua @ 3795:f51308fcba83

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mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
author Kim Alvefur <zash@zash.se>
date Mon, 30 Dec 2019 04:07:25 +0100
parents 4b258329e6e4
children d1ad10b76b00
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1 -- RESTful API
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2 --
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3 -- Copyright (c) 2019 Kim Alvefur
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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 local errors = require "util.error";
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8 local http = require "net.http";
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9 local id = require "util.id";
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10 local jid = require "util.jid";
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11 local st = require "util.stanza";
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12 local xml = require "util.xml";
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13
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14 local allow_any_source = module:get_host_type() == "component";
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15 local validate_from_addresses = module:get_option_boolean("validate_from_addresses", true);
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16
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17 local function handle_post(event)
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18 local request, response = event.request, event.response;
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19 if request.headers.content_type ~= "application/xmpp+xml" then
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20 return errors.new({ code = 415, text = "'application/xmpp+xml' expected" });
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21 end
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22 local payload, err = xml.parse(request.body);
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23 if not payload then
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24 -- parse fail
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25 return errors.new({ code = 400, text = err });
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26 end
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27 local to = jid.prep(payload.attr.to);
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28 if not to then
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29 return errors.new({ code = 400, text = "Invalid destination JID" });
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30 end
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31 local from = module.host;
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32 if allow_any_source and payload.attr.from then
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33 from = jid.prep(payload.attr.from);
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34 if not from then
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35 return errors.new({ code = 400, text = "Invalid source JID" });
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36 end
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37 if validate_from_addresses and not jid.compare(from, module.host) then
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38 return errors.new({ code = 403, text = "Source JID must belong to current host" });
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39 end
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40 end
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41 payload.attr = {
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42 from = from,
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43 to = to,
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44 id = payload.attr.id or id.medium(),
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45 type = payload.attr.type,
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46 ["xml:lang"] = payload.attr["xml:lang"],
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47 };
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48 if payload.name == "iq" then
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49 if payload.attr.type ~= "get" and payload.attr.type ~= "set" then
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50 return errors.new({ code = 400, text = "'iq' stanza must be of type 'get' or 'set'" });
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51 end
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52 return module:send_iq(payload):next(
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53 function (result)
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54 response.headers.content_type = "application/xmpp+xml";
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55 return tostring(result.stanza);
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56 end,
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57 function (error)
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58 if error.context.stanza then
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59 response.headers.content_type = "application/xmpp+xml";
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60 return tostring(error.context.stanza);
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61 else
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62 return error;
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63 end
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64 end);
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65 elseif payload.name == "message" or payload.name == "presence" then
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66 if module:send(payload) then
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67 return 202;
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68 else
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69 return 500;
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70 end
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71 else
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72 return errors.new({ code = 400, text = "Invalid stanza, must be 'message', 'presence' or 'iq'." });
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73 end
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74 end
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75
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76 -- Handle stanzas submitted via HTTP
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77 module:depends("http");
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78 module:provides("http", {
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79 route = {
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80 POST = handle_post;
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81 };
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82 });
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83
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84 -- Forward stanzas from XMPP to HTTP and return any reply
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85 local rest_url = module:get_option_string("rest_callback_url", nil);
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86 if rest_url then
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87
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88 local function handle_stanza(event)
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89 local stanza, origin = event.stanza, event.origin;
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90 local reply_needed = stanza.name == "iq";
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91
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92 http.request(rest_url, {
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93 body = tostring(stanza),
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94 headers = {
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95 ["Content-Type"] = "application/xmpp+xml",
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96 ["Content-Language"] = stanza.attr["xml:lang"],
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97 Accept = "application/xmpp+xml, text/plain",
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98 },
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99 }, function (body, code, response)
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100 if (code == 202 or code == 204) and not reply_needed then
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101 -- Delivered, no reply
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102 return;
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103 end
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104 local reply, reply_text;
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105
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106 if response.headers["content-type"] == "application/xmpp+xml" then
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107 local parsed, err = xml.parse(body);
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108 if not parsed then
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109 module:log("warn", "REST callback responded with invalid XML: %s, %q", err, body);
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110 elseif parsed.name ~= stanza.name then
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111 module:log("warn", "REST callback responded with the wrong stanza type, got %s but expected %s", parsed.name, stanza.name);
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112 else
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113 parsed.attr.to, parsed.attr.from = stanza.attr.from, stanza.attr.to;
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114 if parsed.name == "iq" then
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115 parsed.attr.id = stanza.attr.id;
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116 end
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117 reply = parsed;
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118 end
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119 elseif response.headers["content-type"] == "text/plain" then
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120 reply = st.reply(stanza);
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121 if body ~= "" then
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122 reply_text = body;
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123 end
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124 elseif body ~= "" then -- ignore empty body
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125 module:log("debug", "Callback returned response of unhandled type %q", response.headers["content-type"]);
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126 end
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127
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128 if not reply then
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129 local code_hundreds = code - (code % 100);
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130 if code_hundreds == 200 then
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131 reply = st.reply(stanza);
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132 if stanza.name ~= "iq" then
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133 reply.attr.id = id.medium();
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134 end
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135 if reply_text and reply.name == "message" then
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136 reply:body(reply_text, { ["xml:lang"] = response.headers["content-language"] });
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137 end
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138 -- TODO presence/status=body ?
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139 elseif code_hundreds == 400 then
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140 reply = st.error_reply(stanza, "modify", "bad-request", reply_text);
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141 elseif code_hundreds == 500 then
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parents: 3794
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142 reply = st.error_reply(stanza, "cancel", "internal-server-error", reply_text);
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parents: 3794
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143 else
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parents: 3794
diff changeset
144 reply = st.error_reply(stanza, "cancel", "undefined-condition", reply_text);
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parents: 3794
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145 end
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
146 end
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parents: 3794
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147
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parents: 3794
diff changeset
148 origin.send(reply);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
149 end);
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parents: 3794
diff changeset
150
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
151 return true;
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
152 end
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parents: 3794
diff changeset
153
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parents: 3794
diff changeset
154 if module:get_host_type() == "component" then
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parents: 3794
diff changeset
155 module:hook("iq/bare", handle_stanza, -1);
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parents: 3794
diff changeset
156 module:hook("message/bare", handle_stanza, -1);
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parents: 3794
diff changeset
157 module:hook("presence/bare", handle_stanza, -1);
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parents: 3794
diff changeset
158 module:hook("iq/full", handle_stanza, -1);
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parents: 3794
diff changeset
159 module:hook("message/full", handle_stanza, -1);
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parents: 3794
diff changeset
160 module:hook("presence/full", handle_stanza, -1);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
161 module:hook("iq/host", handle_stanza, -1);
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parents: 3794
diff changeset
162 module:hook("message/host", handle_stanza, -1);
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parents: 3794
diff changeset
163 module:hook("presence/host", handle_stanza, -1);
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parents: 3794
diff changeset
164 else
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
165 -- Don't override everything on normal VirtualHosts
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
166 module:hook("iq/host", handle_stanza, -1);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
167 module:hook("message/host", handle_stanza, -1);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
168 module:hook("presence/host", handle_stanza, -1);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
169 end
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
170 end