prosody
ec6919401790
plugins/mod_external_services.lua

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plugins/mod_external_services.lua @ 11039:ec6919401790

mod_external_services: Allow specifying a credential generation callback This is especially targeted at services added via the items API. More involved credential generation should use the event hook.
author Kim Alvefur <zash@zash.se>
date Sat, 25 Jul 2020 12:22:03 +0200
parent 11038:efefdf71373b
child 11040:c560531d9a6e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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Kim Alvefur <zash@zash.se>
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1
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2 local dt = require "util.datetime";
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3 local base64 = require "util.encodings".base64;
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4 local hashes = require "util.hashes";
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5 local st = require "util.stanza";
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6 local jid = require "util.jid";
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7
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8 local default_host = module:get_option_string("external_service_host", module.host);
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9 local default_port = module:get_option_number("external_service_port");
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10 local default_secret = module:get_option_string("external_service_secret");
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11 local default_ttl = module:get_option_number("external_service_ttl", 86400);
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12
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13 local configured_services = module:get_option_array("external_services", {});
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14
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15 local access = module:get_option_set("external_service_access", {});
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16
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17 -- https://tools.ietf.org/html/draft-uberti-behave-turn-rest-00
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18 local function behave_turn_rest_credentials(srv, item, secret)
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19 local ttl = default_ttl;
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20 if type(item.ttl) == "number" then
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21 ttl = item.ttl;
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22 end
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23 local expires = srv.expires or os.time() + ttl;
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24 local username;
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25 if type(item.username) == "string" then
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26 username = string.format("%d:%s", expires, item.username);
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27 else
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28 username = string.format("%d", expires);
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29 end
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30 srv.username = username;
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31 srv.password = base64.encode(hashes.hmac_sha1(secret, srv.username));
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32 end
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33
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34 local algorithms = {
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35 turn = behave_turn_rest_credentials;
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36 }
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37
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38 -- filter config into well-defined service records
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39 local function prepare(item)
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40 if type(item) ~= "table" then
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41 module:log("error", "Service definition is not a table: %q", item);
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42 return nil;
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43 end
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44
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45 local srv = {
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46 type = nil;
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47 transport = nil;
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48 host = default_host;
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49 port = default_port;
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50 username = nil;
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51 password = nil;
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52 restricted = nil;
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53 expires = nil;
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54 };
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55
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56 if type(item.type) == "string" then
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57 srv.type = item.type;
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58 else
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59 module:log("error", "Service missing mandatory 'type' field: %q", item);
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60 return nil;
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61 end
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62 if type(item.transport) == "string" then
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63 srv.transport = item.transport;
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64 end
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65 if type(item.host) == "string" then
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66 srv.host = item.host;
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67 end
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68 if type(item.port) == "number" then
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69 srv.port = item.port;
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70 end
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71 if type(item.username) == "string" then
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72 srv.username = item.username;
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73 end
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74 if type(item.password) == "string" then
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75 srv.password = item.password;
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76 srv.restricted = true;
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77 end
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78 if item.restricted == true then
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79 srv.restricted = true;
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80 end
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81 if type(item.expires) == "number" then
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82 srv.expires = item.expires;
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83 elseif type(item.ttl) == "number" then
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84 srv.expires = os.time() + item.ttl;
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85 end
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86 if (item.secret == true and default_secret) or type(item.secret) == "string" then
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87 local secret_cb = item.credentials_cb or algorithms[item.algorithm] or algorithms[srv.type];
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88 local secret = item.secret;
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89 if secret == true then
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90 secret = default_secret;
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91 end
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92 if secret_cb then
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93 secret_cb(srv, item, secret);
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94 srv.restricted = true;
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95 end
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96 end
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97 return srv;
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98 end
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99
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100 function module.load()
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101 -- Trigger errors on startup
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102 local services = configured_services / prepare;
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103 if #services == 0 then
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104 module:log("warn", "No services configured or all had errors");
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105 end
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106 end
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107
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108 local function handle_services(event)
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109 local origin, stanza = event.origin, event.stanza;
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110 local action = stanza.tags[1];
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111
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112 local user_bare = jid.bare(stanza.attr.from);
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113 local user_host = jid.host(user_bare);
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114 if not ((access:empty() and origin.type == "c2s") or access:contains(user_bare) or access:contains(user_host)) then
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115 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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116 return true;
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117 end
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118
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119 local reply = st.reply(stanza):tag("services", { xmlns = action.attr.xmlns });
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120 local extras = module:get_host_items("external_service");
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121 local services = ( configured_services + extras ) / prepare;
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122
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123 local requested_type = action.attr.type;
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124 if requested_type then
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125 services:filter(function(item)
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126 return item.type == requested_type;
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127 end);
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128 end
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129
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130 module:fire_event("external_service/services", {
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131 origin = origin;
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diff changeset
132 stanza = stanza;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
133 reply = reply;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
134 requested_type = requested_type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
135 services = services;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
136 });
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
137
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
138 for _, srv in ipairs(services) do
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
139 reply:tag("service", {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
140 type = srv.type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
141 transport = srv.transport;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 host = srv.host;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
143 port = srv.port and string.format("%d", srv.port) or nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 username = srv.username;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
145 password = srv.password;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
146 expires = srv.expires and dt.datetime(srv.expires) or nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
147 restricted = srv.restricted and "1" or nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
148 }):up();
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
149 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
150
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
151 origin.send(reply);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
152 return true;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
153 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
154
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
155 local function handle_credentials(event)
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
156 local origin, stanza = event.origin, event.stanza;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
157 local action = stanza.tags[1];
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
158
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
159 if origin.type ~= "c2s" then
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
160 origin.send(st.error_reply(stanza, "auth", "forbidden"));
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
161 return true;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
162 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
163
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
164 local reply = st.reply(stanza):tag("credentials", { xmlns = action.attr.xmlns });
11037
936ee55e1ae3 mod_external_services: Support adding services via items API
Kim Alvefur <zash@zash.se>
parents: 11036
diff changeset
165 local extras = module:get_host_items("external_service");
936ee55e1ae3 mod_external_services: Support adding services via items API
Kim Alvefur <zash@zash.se>
parents: 11036
diff changeset
166 local services = ( configured_services + extras ) / prepare;
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
167 services:filter(function (item)
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
168 return item.restricted;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
169 end)
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
170
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
171 local requested_credentials = {};
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
172 for service in action:childtags("service") do
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
173 table.insert(requested_credentials, {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
174 type = service.attr.type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
175 host = service.attr.host;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
176 port = tonumber(service.attr.port);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
177 });
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
178 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
179
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
180 module:fire_event("external_service/credentials", {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
181 origin = origin;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
182 stanza = stanza;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
183 reply = reply;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
184 requested_credentials = requested_credentials;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
185 services = services;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
186 });
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
187
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
188 for req_srv in action:childtags("service") do
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
189 for _, srv in ipairs(services) do
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
190 if srv.type == req_srv.attr.type and srv.host == req_srv.attr.host
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
191 and not req_srv.attr.port or srv.port == tonumber(req_srv.attr.port) then
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
192 reply:tag("service", {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
193 type = srv.type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
194 transport = srv.transport;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
195 host = srv.host;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
196 port = srv.port and string.format("%d", srv.port) or nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
197 username = srv.username;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
198 password = srv.password;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
199 expires = srv.expires and dt.datetime(srv.expires) or nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
200 restricted = srv.restricted and "1" or nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
201 }):up();
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
202 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
203 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
204 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
205
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
206 origin.send(reply);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
207 return true;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
208 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
209
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
210 -- XEP-0215 v0.7
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
211 module:add_feature("urn:xmpp:extdisco:2");
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 module:hook("iq-get/host/urn:xmpp:extdisco:2:services", handle_services);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 module:hook("iq-get/host/urn:xmpp:extdisco:2:credentials", handle_credentials);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
214
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
215 -- COMPAT XEP-0215 v0.6
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
216 -- Those still on the old version gets to deal with undefined attributes until they upgrade.
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
217 module:add_feature("urn:xmpp:extdisco:1");
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 module:hook("iq-get/host/urn:xmpp:extdisco:1:services", handle_services);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
219 module:hook("iq-get/host/urn:xmpp:extdisco:1:credentials", handle_credentials);