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annotate mod_rest/mod_rest.lua @ 3797:ed5d7586a61e

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mod_rest: Map various HTTP status codes to XMPP stanza errors
author Kim Alvefur <zash@zash.se>
date Mon, 30 Dec 2019 05:17:18 +0100
parents d1ad10b76b00
children 9b4fd2553365
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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 local origin = {};
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67 function origin.send(stanza)
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68 response:send(tostring(stanza));
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69 return true;
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70 end
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71 response.headers.content_type = "application/xmpp+xml";
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72 if module:send(payload, origin) then
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73 return 202;
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74 else
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75 return 500;
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76 end
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77 else
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78 return errors.new({ code = 400, text = "Invalid stanza, must be 'message', 'presence' or 'iq'." });
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79 end
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80 end
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81
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82 -- Handle stanzas submitted via HTTP
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83 module:depends("http");
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84 module:provides("http", {
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85 route = {
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86 POST = handle_post;
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87 };
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88 });
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89
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90 -- Forward stanzas from XMPP to HTTP and return any reply
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91 local rest_url = module:get_option_string("rest_callback_url", nil);
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92 if rest_url then
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93
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94 local code2err = {
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95 [400] = { condition = "bad-request"; type = "modify" };
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96 [401] = { condition = "not-authorized"; type = "auth" };
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97 [402] = { condition = "not-authorized"; type = "auth" };
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98 [403] = { condition = "forbidden"; type = "auth" };
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99 [404] = { condition = "item-not-found"; type = "cancel" };
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100 [406] = { condition = "not-acceptable"; type = "modify" };
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101 [408] = { condition = "remote-server-timeout"; type = "wait" };
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102 [409] = { condition = "conflict"; type = "cancel" };
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103 [410] = { condition = "gone"; type = "cancel" };
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104 [411] = { condition = "bad-request"; type = "modify" };
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105 [412] = { condition = "bad-request"; type = "modify" };
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106 [413] = { condition = "resource-constraint"; type = "modify" };
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107 [414] = { condition = "resource-constraint"; type = "modify" };
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108 [415] = { condition = "bad-request"; type = "modify" };
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109 [429] = { condition = "resource-constraint"; type = "wait" };
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110 [431] = { condition = "resource-constraint"; type = "wait" };
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111
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112 [500] = { condition = "internal-server-error"; type = "cancel" };
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113 [501] = { condition = "feature-not-implemented"; type = "modify" };
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114 [502] = { condition = "remote-server-timeout"; type = "wait" };
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115 [503] = { condition = "service-unavailable"; type = "cancel" };
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116 [504] = { condition = "remote-server-timeout"; type = "wait" };
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117 [507] = { condition = "resource-constraint"; type = "wait" };
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118 };
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119
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120 local function handle_stanza(event)
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121 local stanza, origin = event.stanza, event.origin;
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122 local reply_needed = stanza.name == "iq";
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123
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124 http.request(rest_url, {
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125 body = tostring(stanza),
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126 headers = {
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127 ["Content-Type"] = "application/xmpp+xml",
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128 ["Content-Language"] = stanza.attr["xml:lang"],
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129 Accept = "application/xmpp+xml, text/plain",
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130 },
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parents: 3794
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131 }, function (body, code, response)
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132 if (code == 202 or code == 204) and not reply_needed then
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133 -- Delivered, no reply
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134 return;
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Kim Alvefur <zash@zash.se>
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135 end
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Kim Alvefur <zash@zash.se>
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136 local reply, reply_text;
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137
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138 if response.headers["content-type"] == "application/xmpp+xml" then
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Kim Alvefur <zash@zash.se>
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139 local parsed, err = xml.parse(body);
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140 if not parsed then
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141 module:log("warn", "REST callback responded with invalid XML: %s, %q", err, body);
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142 elseif parsed.name ~= stanza.name then
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Kim Alvefur <zash@zash.se>
parents: 3794
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143 module:log("warn", "REST callback responded with the wrong stanza type, got %s but expected %s", parsed.name, stanza.name);
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144 else
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
145 parsed.attr.to, parsed.attr.from = stanza.attr.from, stanza.attr.to;
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
146 if parsed.name == "iq" then
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Kim Alvefur <zash@zash.se>
parents: 3794
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147 parsed.attr.id = stanza.attr.id;
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Kim Alvefur <zash@zash.se>
parents: 3794
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148 end
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
149 reply = parsed;
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150 end
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parents: 3794
diff changeset
151 elseif response.headers["content-type"] == "text/plain" then
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
152 reply = st.reply(stanza);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
153 if body ~= "" then
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
154 reply_text = body;
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
155 end
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
156 elseif body ~= "" then -- ignore empty body
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
157 module:log("debug", "Callback returned response of unhandled type %q", response.headers["content-type"]);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
158 end
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
159
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
160 if not reply then
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
161 local code_hundreds = code - (code % 100);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
162 if code_hundreds == 200 then
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
163 reply = st.reply(stanza);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
164 if stanza.name ~= "iq" then
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
165 reply.attr.id = id.medium();
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
166 end
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parents: 3794
diff changeset
167 if reply_text and reply.name == "message" then
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
168 reply:body(reply_text, { ["xml:lang"] = response.headers["content-language"] });
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
169 end
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
170 -- TODO presence/status=body ?
3797
ed5d7586a61e mod_rest: Map various HTTP status codes to XMPP stanza errors
Kim Alvefur <zash@zash.se>
parents: 3796
diff changeset
171 elseif code2err[code] then
ed5d7586a61e mod_rest: Map various HTTP status codes to XMPP stanza errors
Kim Alvefur <zash@zash.se>
parents: 3796
diff changeset
172 reply = st.error_reply(stanza, errors.new(code, nil, code2err));
3795
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
173 elseif code_hundreds == 400 then
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
174 reply = st.error_reply(stanza, "modify", "bad-request", reply_text);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
175 elseif code_hundreds == 500 then
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
176 reply = st.error_reply(stanza, "cancel", "internal-server-error", reply_text);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
177 else
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
178 reply = st.error_reply(stanza, "cancel", "undefined-condition", reply_text);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
179 end
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
180 end
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
181
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
182 origin.send(reply);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
183 end);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
184
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
185 return true;
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
186 end
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
187
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
188 if module:get_host_type() == "component" then
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
189 module:hook("iq/bare", handle_stanza, -1);
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Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
190 module:hook("message/bare", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
191 module:hook("presence/bare", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
192 module:hook("iq/full", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
193 module:hook("message/full", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
194 module:hook("presence/full", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
195 module:hook("iq/host", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
196 module:hook("message/host", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
197 module:hook("presence/host", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
198 else
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
199 -- Don't override everything on normal VirtualHosts
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
200 module:hook("iq/host", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
201 module:hook("message/host", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
202 module:hook("presence/host", handle_stanza, -1);
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
203 end
f51308fcba83 mod_rest: Allow specifying a webhook/callback to handle incoming stanzas
Kim Alvefur <zash@zash.se>
parents: 3794
diff changeset
204 end