prosody
0a137436490f
plugins/mod_external_services.lua

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plugins/mod_external_services.lua @ 12720:0a137436490f

mod_smacks: Set session flag during successful enable
author Matthew Wild <mwild1@gmail.com>
date Sat, 03 Sep 2022 21:20:29 +0100
parent 12685:4d75663d1552
child 12977:74b9e05af71e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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2 local dt = require "util.datetime";
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Kim Alvefur <zash@zash.se>
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3 local base64 = require "util.encodings".base64;
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Kim Alvefur <zash@zash.se>
parents:
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4 local hashes = require "util.hashes";
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
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5 local st = require "util.stanza";
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Kim Alvefur <zash@zash.se>
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6 local jid = require "util.jid";
11040
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
7 local array = require "util.array";
11754
21a9b3f2a728 mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 11753
diff changeset
8 local set = require "util.set";
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
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9
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Kim Alvefur <zash@zash.se>
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10 local default_host = module:get_option_string("external_service_host", module.host);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
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11 local default_port = module:get_option_number("external_service_port");
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
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12 local default_secret = module:get_option_string("external_service_secret");
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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13 local default_ttl = module:get_option_number("external_service_ttl", 86400);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
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14
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Kim Alvefur <zash@zash.se>
parents:
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15 local configured_services = module:get_option_array("external_services", {});
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16
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Kim Alvefur <zash@zash.se>
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17 local access = module:get_option_set("external_service_access", {});
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
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18
12685
4d75663d1552 mod_external_services: Update tools.ietf.org URL
Kim Alvefur <zash@zash.se>
parents: 12431
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19 -- https://datatracker.ietf.org/doc/html/draft-uberti-behave-turn-rest-00
11038
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
Kim Alvefur <zash@zash.se>
parents: 11037
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20 local function behave_turn_rest_credentials(srv, item, secret)
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
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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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parents: 11037
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24 end
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parents: 11037
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25 local expires = srv.expires or os.time() + ttl;
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
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parents: 11037
diff changeset
26 local username;
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
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parents: 11037
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27 if type(item.username) == "string" then
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
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parents: 11037
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28 username = string.format("%d:%s", expires, item.username);
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
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parents: 11037
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29 else
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
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parents: 11037
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30 username = string.format("%d", expires);
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
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parents: 11037
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31 end
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parents: 11037
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32 srv.username = username;
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parents: 11037
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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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parents: 11037
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35
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parents: 11037
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36 local algorithms = {
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parents: 11037
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37 turn = behave_turn_rest_credentials;
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parents: 11037
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38 }
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parents: 11037
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39
11036
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40 -- filter config into well-defined service records
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Kim Alvefur <zash@zash.se>
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41 local function prepare(item)
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Kim Alvefur <zash@zash.se>
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42 if type(item) ~= "table" then
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Kim Alvefur <zash@zash.se>
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43 module:log("error", "Service definition is not a table: %q", item);
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44 return nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
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45 end
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Kim Alvefur <zash@zash.se>
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46
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
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47 local srv = {
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Kim Alvefur <zash@zash.se>
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48 type = nil;
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parents:
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49 transport = nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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50 host = default_host;
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Kim Alvefur <zash@zash.se>
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51 port = default_port;
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parents:
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52 username = nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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53 password = nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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54 restricted = nil;
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Kim Alvefur <zash@zash.se>
parents:
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55 expires = nil;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
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56 };
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57
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Kim Alvefur <zash@zash.se>
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58 if type(item.type) == "string" then
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Kim Alvefur <zash@zash.se>
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59 srv.type = item.type;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
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60 else
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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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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Kim Alvefur <zash@zash.se>
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63 end
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Kim Alvefur <zash@zash.se>
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64 if type(item.transport) == "string" then
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65 srv.transport = item.transport;
11933
f752427a5214 mod_external_services: Warn about missing recommended fields
Kim Alvefur <zash@zash.se>
parents: 11756
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66 else
f752427a5214 mod_external_services: Warn about missing recommended fields
Kim Alvefur <zash@zash.se>
parents: 11756
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67 module:log("warn", "Service missing recommended 'transport' field: %q", item);
11036
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68 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
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69 if type(item.host) == "string" then
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70 srv.host = item.host;
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parents:
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71 end
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72 if type(item.port) == "number" then
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
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73 srv.port = item.port;
11933
f752427a5214 mod_external_services: Warn about missing recommended fields
Kim Alvefur <zash@zash.se>
parents: 11756
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74 elseif not srv.port then
f752427a5214 mod_external_services: Warn about missing recommended fields
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75 module:log("warn", "Service missing recommended 'port' field: %q", item);
11036
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76 end
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77 if type(item.username) == "string" then
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78 srv.username = item.username;
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79 end
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80 if type(item.password) == "string" then
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81 srv.password = item.password;
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82 srv.restricted = true;
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Kim Alvefur <zash@zash.se>
parents:
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83 end
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Kim Alvefur <zash@zash.se>
parents:
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84 if item.restricted == true then
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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85 srv.restricted = true;
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Kim Alvefur <zash@zash.se>
parents:
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86 end
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Kim Alvefur <zash@zash.se>
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87 if type(item.expires) == "number" then
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
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88 srv.expires = item.expires;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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89 elseif type(item.ttl) == "number" then
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parents:
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90 srv.expires = os.time() + item.ttl;
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parents:
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91 end
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Kim Alvefur <zash@zash.se>
parents:
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92 if (item.secret == true and default_secret) or type(item.secret) == "string" then
11039
ec6919401790 mod_external_services: Allow specifying a credential generation callback
Kim Alvefur <zash@zash.se>
parents: 11038
diff changeset
93 local secret_cb = item.credentials_cb or algorithms[item.algorithm] or algorithms[srv.type];
11036
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Kim Alvefur <zash@zash.se>
parents:
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94 local secret = item.secret;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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95 if secret == true then
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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96 secret = default_secret;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
97 end
11038
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
Kim Alvefur <zash@zash.se>
parents: 11037
diff changeset
98 if secret_cb then
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
Kim Alvefur <zash@zash.se>
parents: 11037
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99 secret_cb(srv, item, secret);
efefdf71373b mod_external_services: Prepare to allow more credential algorithms
Kim Alvefur <zash@zash.se>
parents: 11037
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100 srv.restricted = true;
11036
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Kim Alvefur <zash@zash.se>
parents:
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101 end
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Kim Alvefur <zash@zash.se>
parents:
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102 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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103 return srv;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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104 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
105
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
106 function module.load()
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Kim Alvefur <zash@zash.se>
parents:
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107 -- Trigger errors on startup
11626
ef62d29c8fdc mod_external_services: Also validate services added by other modules
Kim Alvefur <zash@zash.se>
parents: 11040
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108 local extras = module:get_host_items("external_service");
ef62d29c8fdc mod_external_services: Also validate services added by other modules
Kim Alvefur <zash@zash.se>
parents: 11040
diff changeset
109 local services = ( configured_services + extras ) / prepare;
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
110 if #services == 0 then
11628
0807e835d3b5 mod_external_services: Report overall status as a module status
Kim Alvefur <zash@zash.se>
parents: 11627
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111 module:set_status("warn", "No services configured or all had errors");
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
112 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
113 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
114
11627
3a5212fd7e8e mod_external_services: Validate items as they are added
Kim Alvefur <zash@zash.se>
parents: 11626
diff changeset
115 module:handle_items("external_service", function(added)
11628
0807e835d3b5 mod_external_services: Report overall status as a module status
Kim Alvefur <zash@zash.se>
parents: 11627
diff changeset
116 if prepare(added.item) then
0807e835d3b5 mod_external_services: Report overall status as a module status
Kim Alvefur <zash@zash.se>
parents: 11627
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117 module:set_status("core", "OK");
0807e835d3b5 mod_external_services: Report overall status as a module status
Kim Alvefur <zash@zash.se>
parents: 11627
diff changeset
118 end
11627
3a5212fd7e8e mod_external_services: Validate items as they are added
Kim Alvefur <zash@zash.se>
parents: 11626
diff changeset
119 end, module.load);
3a5212fd7e8e mod_external_services: Validate items as they are added
Kim Alvefur <zash@zash.se>
parents: 11626
diff changeset
120
11040
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
121 -- Ensure only valid items are added in events
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
122 local services_mt = {
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
123 __index = getmetatable(array()).__index;
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
124 __newindex = function (self, i, v)
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
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125 rawset(self, i, assert(prepare(v), "Invalid service entry added"));
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
126 end;
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
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127 }
c560531d9a6e mod_external_services: Validate services added via events
Kim Alvefur <zash@zash.se>
parents: 11039
diff changeset
128
11755
ae565e49289a mod_external_services: Factor out public function returning current services
Kim Alvefur <zash@zash.se>
parents: 11754
diff changeset
129 function get_services()
ae565e49289a mod_external_services: Factor out public function returning current services
Kim Alvefur <zash@zash.se>
parents: 11754
diff changeset
130 local extras = module:get_host_items("external_service");
ae565e49289a mod_external_services: Factor out public function returning current services
Kim Alvefur <zash@zash.se>
parents: 11754
diff changeset
131 local services = ( configured_services + extras ) / prepare;
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Kim Alvefur <zash@zash.se>
parents: 11754
diff changeset
132
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diff changeset
133 setmetatable(services, services_mt);
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diff changeset
134
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parents: 11754
diff changeset
135 return services;
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Kim Alvefur <zash@zash.se>
parents: 11754
diff changeset
136 end
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diff changeset
137
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diff changeset
138 function services_xml(services, name, namespace)
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139 local reply = st.stanza(name or "services", { xmlns = namespace or "urn:xmpp:extdisco:2" });
11036
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140
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parents:
diff changeset
141 for _, srv in ipairs(services) do
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 reply:tag("service", {
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
143 type = srv.type;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 transport = srv.transport;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
145 host = srv.host;
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parents:
diff changeset
146 port = srv.port and string.format("%d", srv.port) or nil;
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parents:
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147 username = srv.username;
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Kim Alvefur <zash@zash.se>
parents:
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148 password = srv.password;
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Kim Alvefur <zash@zash.se>
parents:
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149 expires = srv.expires and dt.datetime(srv.expires) or nil;
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150 restricted = srv.restricted and "1" or nil;
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parents:
diff changeset
151 }):up();
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152 end
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153
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154 return reply;
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Kim Alvefur <zash@zash.se>
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155 end
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156
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157 local function handle_services(event)
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158 local origin, stanza = event.origin, event.stanza;
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159 local action = stanza.tags[1];
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160
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161 local user_bare = jid.bare(stanza.attr.from);
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162 local user_host = jid.host(user_bare);
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163 if not ((access:empty() and origin.type == "c2s") or access:contains(user_bare) or access:contains(user_host)) then
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diff changeset
164 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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165 return true;
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Kim Alvefur <zash@zash.se>
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166 end
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167
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168 local services = get_services();
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169
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170 local requested_type = action.attr.type;
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171 if requested_type then
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Kim Alvefur <zash@zash.se>
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172 services:filter(function(item)
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173 return item.type == requested_type;
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174 end);
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175 end
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176
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177 module:fire_event("external_service/services", {
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178 origin = origin;
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179 stanza = stanza;
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180 requested_type = requested_type;
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181 services = services;
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Kim Alvefur <zash@zash.se>
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182 });
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183
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184 local reply = st.reply(stanza):add_child(services_xml(services, action.name, action.attr.xmlns));
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185
11036
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diff changeset
186 origin.send(reply);
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Kim Alvefur <zash@zash.se>
parents:
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187 return true;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
188 end
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parents:
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189
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Kim Alvefur <zash@zash.se>
parents:
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190 local function handle_credentials(event)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
191 local origin, stanza = event.origin, event.stanza;
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parents:
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192 local action = stanza.tags[1];
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parents:
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193
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diff changeset
194 if origin.type ~= "c2s" then
12431
95f33a006c03 mod_external_services: Move error message to correct place (fix #1725)
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parents: 11933
diff changeset
195 origin.send(st.error_reply(stanza, "auth", "forbidden"));
11036
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196 return true;
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Kim Alvefur <zash@zash.se>
parents:
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197 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
198
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199 local services = get_services();
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parents:
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200 services:filter(function (item)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
201 return item.restricted;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
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202 end)
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
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diff changeset
203
11754
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204 local requested_credentials = set.new();
11036
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parents:
diff changeset
205 for service in action:childtags("service") do
11753
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parents: 11628
diff changeset
206 if not service.attr.type or not service.attr.host then
12431
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Kim Alvefur <zash@zash.se>
parents: 11933
diff changeset
207 origin.send(st.error_reply(stanza, "modify", "bad-request", "The 'port' and 'type' attributes are required."));
11753
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parents: 11628
diff changeset
208 return true;
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Kim Alvefur <zash@zash.se>
parents: 11628
diff changeset
209 end
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Kim Alvefur <zash@zash.se>
parents: 11628
diff changeset
210
11754
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parents: 11753
diff changeset
211 requested_credentials:add(string.format("%s:%s:%d", service.attr.type, service.attr.host,
21a9b3f2a728 mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 11753
diff changeset
212 tonumber(service.attr.port) or 0));
11036
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 end
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 module:fire_event("external_service/credentials", {
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
216 origin = origin;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
217 stanza = stanza;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 requested_credentials = requested_credentials;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
219 services = services;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 });
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
221
11754
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parents: 11753
diff changeset
222 services:filter(function (srv)
21a9b3f2a728 mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 11753
diff changeset
223 local port_key = string.format("%s:%s:%d", srv.type, srv.host, srv.port or 0);
21a9b3f2a728 mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 11753
diff changeset
224 local portless_key = string.format("%s:%s:%d", srv.type, srv.host, 0);
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Kim Alvefur <zash@zash.se>
parents: 11753
diff changeset
225 return requested_credentials:contains(port_key) or requested_credentials:contains(portless_key);
21a9b3f2a728 mod_external_services: Filter services by requested credentials using a Set
Kim Alvefur <zash@zash.se>
parents: 11753
diff changeset
226 end);
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parents: 11753
diff changeset
227
11756
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diff changeset
228 local reply = st.reply(stanza):add_child(services_xml(services, action.name, action.attr.xmlns));
11036
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
229
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
230 origin.send(reply);
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
231 return true;
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
232 end
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
233
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
234 -- XEP-0215 v0.7
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
235 module:add_feature("urn:xmpp:extdisco:2");
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
236 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
237 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
238
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
239 -- COMPAT XEP-0215 v0.6
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
240 -- 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
241 module:add_feature("urn:xmpp:extdisco:1");
79e410cd7f6e mod_external_services: XEP-0215: External Service Discovery
Kim Alvefur <zash@zash.se>
parents:
diff changeset
242 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
243 module:hook("iq-get/host/urn:xmpp:extdisco:1:credentials", handle_credentials);