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annotate mod_external_services/mod_external_services.lua @ 5487:6cf2f32dbf40

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mod_s2sout_override: Add support for Direct TLS Well that was easy
author Kim Alvefur <zash@zash.se>
date Wed, 24 May 2023 16:34:35 +0200
parents ede9682c2022
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 local array = require "util.array";
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8 local set = require "util.set";
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9
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10 local default_host = module:get_option_string("external_service_host", module.host);
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11 local default_port = module:get_option_number("external_service_port");
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12 local default_secret = module:get_option_string("external_service_secret");
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13 local default_ttl = module:get_option_number("external_service_ttl", 86400);
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14
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15 local configured_services = module:get_option_array("external_services", {});
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16
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17 local access = module:get_option_set("external_service_access", {});
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18
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19 -- https://tools.ietf.org/html/draft-uberti-behave-turn-rest-00
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20 local function behave_turn_rest_credentials(srv, item, secret)
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21 local ttl = default_ttl;
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22 if type(item.ttl) == "number" then
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23 ttl = item.ttl;
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24 end
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25 local expires = srv.expires or os.time() + ttl;
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26 local username;
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27 if type(item.username) == "string" then
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28 username = string.format("%d:%s", expires, item.username);
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29 else
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30 username = string.format("%d", expires);
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31 end
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32 srv.username = username;
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33 srv.password = base64.encode(hashes.hmac_sha1(secret, srv.username));
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34 end
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35
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36 local algorithms = {
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37 turn = behave_turn_rest_credentials;
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38 }
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39
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40 -- filter config into well-defined service records
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41 local function prepare(item)
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42 if type(item) ~= "table" then
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43 module:log("error", "Service definition is not a table: %q", item);
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44 return nil;
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45 end
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46
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47 local srv = {
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48 type = nil;
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49 transport = nil;
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50 host = default_host;
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51 port = default_port;
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52 username = nil;
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53 password = nil;
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54 restricted = nil;
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55 expires = nil;
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56 };
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57
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58 if type(item.type) == "string" then
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59 srv.type = item.type;
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60 else
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61 module:log("error", "Service missing mandatory 'type' field: %q", item);
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62 return nil;
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63 end
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64 if type(item.transport) == "string" then
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65 srv.transport = item.transport;
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66 end
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67 if type(item.host) == "string" then
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68 srv.host = item.host;
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69 end
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70 if type(item.port) == "number" then
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71 srv.port = item.port;
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72 end
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73 if type(item.username) == "string" then
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74 srv.username = item.username;
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75 end
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76 if type(item.password) == "string" then
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77 srv.password = item.password;
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78 srv.restricted = true;
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79 end
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80 if item.restricted == true then
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81 srv.restricted = true;
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82 end
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83 if type(item.expires) == "number" then
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84 srv.expires = item.expires;
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85 elseif type(item.ttl) == "number" then
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86 srv.expires = os.time() + item.ttl;
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87 end
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88 if (item.secret == true and default_secret) or type(item.secret) == "string" then
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89 local secret_cb = item.credentials_cb or algorithms[item.algorithm] or algorithms[srv.type];
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90 local secret = item.secret;
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91 if secret == true then
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92 secret = default_secret;
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93 end
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94 if secret_cb then
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95 secret_cb(srv, item, secret);
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96 srv.restricted = true;
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97 end
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98 end
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99 return srv;
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100 end
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101
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102 function module.load()
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103 -- Trigger errors on startup
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104 local services = configured_services / prepare;
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105 if #services == 0 then
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106 module:log("warn", "No services configured or all had errors");
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107 end
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108 end
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109
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110 -- Ensure only valid items are added in events
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111 local services_mt = {
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112 __index = getmetatable(array()).__index;
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113 __newindex = function (self, i, v)
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114 rawset(self, i, assert(prepare(v), "Invalid service entry added"));
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115 end;
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116 }
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117
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118 function get_services()
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119 local extras = module:get_host_items("external_service");
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120 local services = ( configured_services + extras ) / prepare;
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121
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122 setmetatable(services, services_mt);
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123
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124 return services;
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125 end
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126
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127 function services_xml(services, name, namespace)
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128 local reply = st.stanza(name or "services", { xmlns = namespace or "urn:xmpp:extdisco:2" });
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129
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130 for _, srv in ipairs(services) do
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131 reply:tag("service", {
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132 type = srv.type;
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133 transport = srv.transport;
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134 host = srv.host;
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135 port = srv.port and string.format("%d", srv.port) or nil;
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136 username = srv.username;
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diff changeset
137 password = srv.password;
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diff changeset
138 expires = srv.expires and dt.datetime(srv.expires) or nil;
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139 restricted = srv.restricted and "1" or nil;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
140 }):up();
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Kim Alvefur <zash@zash.se>
parents:
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141 end
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142
4668
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143 return reply;
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Kim Alvefur <zash@zash.se>
parents: 4667
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144 end
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Kim Alvefur <zash@zash.se>
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145
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Kim Alvefur <zash@zash.se>
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146 local function handle_services(event)
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147 local origin, stanza = event.origin, event.stanza;
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148 local action = stanza.tags[1];
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149
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Kim Alvefur <zash@zash.se>
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150 local user_bare = jid.bare(stanza.attr.from);
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151 local user_host = jid.host(user_bare);
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152 if not ((access:empty() and origin.type == "c2s") or access:contains(user_bare) or access:contains(user_host)) then
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Kim Alvefur <zash@zash.se>
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diff changeset
153 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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154 return true;
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Kim Alvefur <zash@zash.se>
parents: 4667
diff changeset
155 end
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Kim Alvefur <zash@zash.se>
parents: 4667
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156
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157 local services = get_services();
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158
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159 local requested_type = action.attr.type;
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160 if requested_type then
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Kim Alvefur <zash@zash.se>
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161 services:filter(function(item)
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Kim Alvefur <zash@zash.se>
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162 return item.type == requested_type;
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Kim Alvefur <zash@zash.se>
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diff changeset
163 end);
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164 end
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165
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166 module:fire_event("external_service/services", {
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167 origin = origin;
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Kim Alvefur <zash@zash.se>
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168 stanza = stanza;
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Kim Alvefur <zash@zash.se>
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169 requested_type = requested_type;
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Kim Alvefur <zash@zash.se>
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170 services = services;
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Kim Alvefur <zash@zash.se>
parents: 4667
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171 });
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172
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173 local reply = st.reply(stanza):add_child(services_xml(services, action.name, action.attr.xmlns));
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174
4075
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175 origin.send(reply);
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parents:
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176 return true;
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Kim Alvefur <zash@zash.se>
parents:
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177 end
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parents:
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178
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Kim Alvefur <zash@zash.se>
parents:
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179 local function handle_credentials(event)
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Kim Alvefur <zash@zash.se>
parents:
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180 local origin, stanza = event.origin, event.stanza;
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parents:
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181 local action = stanza.tags[1];
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
182
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
183 if origin.type ~= "c2s" then
4665
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Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
184 origin.send(st.error_reply(stanza, "auth", "forbidden", "The 'port' and 'type' attributes are required."));
4075
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Kim Alvefur <zash@zash.se>
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185 return true;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
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186 end
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Kim Alvefur <zash@zash.se>
parents:
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187
4667
1990611691cf mod_external_services: Factor out public function returning current services
Kim Alvefur <zash@zash.se>
parents: 4666
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188 local services = get_services();
4075
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Kim Alvefur <zash@zash.se>
parents:
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189 services:filter(function (item)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
190 return item.restricted;
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Kim Alvefur <zash@zash.se>
parents:
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191 end)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
192
4666
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193 local requested_credentials = set.new();
4075
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
194 for service in action:childtags("service") do
4665
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parents: 4075
diff changeset
195 if not service.attr.type or not service.attr.host then
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Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
196 origin.send(st.error_reply(stanza, "modify", "bad-request"));
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Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
197 return true;
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Kim Alvefur <zash@zash.se>
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198 end
f0ffa8cf3ce6 mod_external_services: Validate required attributes on credentials requests
Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
199
4666
dbc7ba3cc27c mod_external_services: Filter services by requested credentials using a Set
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parents: 4665
diff changeset
200 requested_credentials:add(string.format("%s:%s:%d", service.attr.type, service.attr.host,
dbc7ba3cc27c mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 4665
diff changeset
201 tonumber(service.attr.port) or 0));
4075
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
202 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
203
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
204 module:fire_event("external_service/credentials", {
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
205 origin = origin;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
206 stanza = stanza;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
207 requested_credentials = requested_credentials;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
208 services = services;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
209 });
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
210
4666
dbc7ba3cc27c mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 4665
diff changeset
211 services:filter(function (srv)
dbc7ba3cc27c mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 4665
diff changeset
212 local port_key = string.format("%s:%s:%d", srv.type, srv.host, srv.port or 0);
dbc7ba3cc27c mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 4665
diff changeset
213 local portless_key = string.format("%s:%s:%d", srv.type, srv.host, 0);
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Kim Alvefur <zash@zash.se>
parents: 4665
diff changeset
214 return requested_credentials:contains(port_key) or requested_credentials:contains(portless_key);
dbc7ba3cc27c mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 4665
diff changeset
215 end);
dbc7ba3cc27c mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 4665
diff changeset
216
4668
ede9682c2022 mod_external_services: Factor out public function for converting to XML
Kim Alvefur <zash@zash.se>
parents: 4667
diff changeset
217 local reply = st.reply(stanza):add_child(services_xml(services, action.name, action.attr.xmlns));
4075
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
219 origin.send(reply);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 return true;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
221 end
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
222
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
223 -- XEP-0215 v0.7
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
224 module:add_feature("urn:xmpp:extdisco:2");
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
225 module:hook("iq-get/host/urn:xmpp:extdisco:2:services", handle_services);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
226 module:hook("iq-get/host/urn:xmpp:extdisco:2:credentials", handle_credentials);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
227
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
228 -- COMPAT XEP-0215 v0.6
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
229 -- Those still on the old version gets to deal with undefined attributes until they upgrade.
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
230 module:add_feature("urn:xmpp:extdisco:1");
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
231 module:hook("iq-get/host/urn:xmpp:extdisco:1:services", handle_services);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
232 module:hook("iq-get/host/urn:xmpp:extdisco:1:credentials", handle_credentials);