prosody
c560531d9a6e
plugins/mod_external_services.lua

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plugins/mod_external_services.lua @ 11040:c560531d9a6e

mod_external_services: Validate services added via events While writing developer documentation it became obvious that i was silly to have one item format for config and items API, and another format for the event API. Then there's the stanza format, but that's a common pattern. This change reduces the possible input formats to two and allows other modules the benefit of the processing and validation performed on items from the config.
author Kim Alvefur <zash@zash.se>
date Mon, 17 Aug 2020 00:24:11 +0200
parent 11039:ec6919401790
child 11626:ef62d29c8fdc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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11036
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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
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9 local default_host = module:get_option_string("external_service_host", module.host);
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10 local default_port = module:get_option_number("external_service_port");
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11 local default_secret = module:get_option_string("external_service_secret");
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12 local default_ttl = module:get_option_number("external_service_ttl", 86400);
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13
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14 local configured_services = module:get_option_array("external_services", {});
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15
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16 local access = module:get_option_set("external_service_access", {});
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17
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18 -- https://tools.ietf.org/html/draft-uberti-behave-turn-rest-00
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19 local function behave_turn_rest_credentials(srv, item, secret)
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20 local ttl = default_ttl;
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21 if type(item.ttl) == "number" then
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22 ttl = item.ttl;
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23 end
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24 local expires = srv.expires or os.time() + ttl;
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25 local username;
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26 if type(item.username) == "string" then
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27 username = string.format("%d:%s", expires, item.username);
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28 else
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29 username = string.format("%d", expires);
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30 end
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31 srv.username = username;
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32 srv.password = base64.encode(hashes.hmac_sha1(secret, srv.username));
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33 end
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34
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35 local algorithms = {
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36 turn = behave_turn_rest_credentials;
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37 }
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38
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39 -- filter config into well-defined service records
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40 local function prepare(item)
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41 if type(item) ~= "table" then
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42 module:log("error", "Service definition is not a table: %q", item);
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43 return nil;
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44 end
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45
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46 local srv = {
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47 type = nil;
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48 transport = nil;
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49 host = default_host;
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50 port = default_port;
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51 username = nil;
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52 password = nil;
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53 restricted = nil;
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54 expires = nil;
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55 };
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56
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57 if type(item.type) == "string" then
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58 srv.type = item.type;
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59 else
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60 module:log("error", "Service missing mandatory 'type' field: %q", item);
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61 return nil;
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62 end
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63 if type(item.transport) == "string" then
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64 srv.transport = item.transport;
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65 end
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66 if type(item.host) == "string" then
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67 srv.host = item.host;
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68 end
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69 if type(item.port) == "number" then
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70 srv.port = item.port;
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71 end
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72 if type(item.username) == "string" then
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73 srv.username = item.username;
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74 end
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75 if type(item.password) == "string" then
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76 srv.password = item.password;
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77 srv.restricted = true;
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78 end
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79 if item.restricted == true then
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80 srv.restricted = true;
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81 end
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82 if type(item.expires) == "number" then
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83 srv.expires = item.expires;
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84 elseif type(item.ttl) == "number" then
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85 srv.expires = os.time() + item.ttl;
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86 end
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87 if (item.secret == true and default_secret) or type(item.secret) == "string" then
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88 local secret_cb = item.credentials_cb or algorithms[item.algorithm] or algorithms[srv.type];
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89 local secret = item.secret;
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90 if secret == true then
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91 secret = default_secret;
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92 end
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93 if secret_cb then
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94 secret_cb(srv, item, secret);
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95 srv.restricted = true;
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96 end
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97 end
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98 return srv;
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99 end
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100
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101 function module.load()
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102 -- Trigger errors on startup
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103 local services = configured_services / prepare;
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104 if #services == 0 then
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105 module:log("warn", "No services configured or all had errors");
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106 end
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107 end
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108
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109 -- Ensure only valid items are added in events
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110 local services_mt = {
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111 __index = getmetatable(array()).__index;
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112 __newindex = function (self, i, v)
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113 rawset(self, i, assert(prepare(v), "Invalid service entry added"));
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114 end;
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115 }
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116
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117 local function handle_services(event)
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118 local origin, stanza = event.origin, event.stanza;
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119 local action = stanza.tags[1];
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120
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121 local user_bare = jid.bare(stanza.attr.from);
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122 local user_host = jid.host(user_bare);
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123 if not ((access:empty() and origin.type == "c2s") or access:contains(user_bare) or access:contains(user_host)) then
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124 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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125 return true;
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126 end
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127
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128 local reply = st.reply(stanza):tag("services", { xmlns = action.attr.xmlns });
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129 local extras = module:get_host_items("external_service");
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130 local services = ( configured_services + extras ) / prepare;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
131
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
132 local requested_type = action.attr.type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
133 if requested_type then
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
134 services:filter(function(item)
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
135 return item.type == requested_type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
136 end);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
137 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
138
11040
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
139 setmetatable(services, services_mt);
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
140
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
141 module:fire_event("external_service/services", {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 origin = origin;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
143 stanza = stanza;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 reply = reply;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
145 requested_type = requested_type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
146 services = services;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
147 });
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
148
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
149 for _, srv in ipairs(services) do
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
150 reply:tag("service", {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
151 type = srv.type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
152 transport = srv.transport;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
153 host = srv.host;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
154 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
155 username = srv.username;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
156 password = srv.password;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
157 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
158 restricted = srv.restricted and "1" or nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
159 }):up();
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
160 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
161
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
162 origin.send(reply);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
163 return true;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
164 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
165
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
166 local function handle_credentials(event)
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
167 local origin, stanza = event.origin, event.stanza;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
168 local action = stanza.tags[1];
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
169
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
170 if origin.type ~= "c2s" then
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
171 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
172 return true;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
173 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
174
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
175 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
176 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
177 local services = ( configured_services + extras ) / prepare;
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
178 services:filter(function (item)
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
179 return item.restricted;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
180 end)
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
181
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
182 local requested_credentials = {};
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
183 for service in action:childtags("service") do
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
184 table.insert(requested_credentials, {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
185 type = service.attr.type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
186 host = service.attr.host;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
187 port = tonumber(service.attr.port);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
188 });
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
189 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
190
11040
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
191 setmetatable(services, services_mt);
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
192 setmetatable(requested_credentials, services_mt);
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
193
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
194 module:fire_event("external_service/credentials", {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
195 origin = origin;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
196 stanza = stanza;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
197 reply = reply;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
198 requested_credentials = requested_credentials;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
199 services = services;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
200 });
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
201
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
202 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
203 for _, srv in ipairs(services) do
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
204 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
205 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
206 reply:tag("service", {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
207 type = srv.type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
208 transport = srv.transport;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
209 host = srv.host;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
210 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
211 username = srv.username;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 password = srv.password;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 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
214 restricted = srv.restricted and "1" or nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
215 }):up();
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
216 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
217 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
219
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 origin.send(reply);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
221 return true;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
222 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
223
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
224 -- XEP-0215 v0.7
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
225 module:add_feature("urn:xmpp:extdisco:2");
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
226 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
227 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
228
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
229 -- COMPAT XEP-0215 v0.6
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
230 -- 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
231 module:add_feature("urn:xmpp:extdisco:1");
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
232 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
233 module:hook("iq-get/host/urn:xmpp:extdisco:1:credentials", handle_credentials);