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annotate mod_devices/mod_devices.lua @ 4895:2542fd80cd15

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mod_turn_external: Fix type of config option (thanks mirux) There was a separate boolean option to enable TLS before, but it was merged with the port number option and it seems the typed API interface got confused. Backport of trunk rev aa7a8aa64d3f
author Kim Alvefur <zash@zash.se>
date Tue, 15 Feb 2022 21:51:52 +0100
parents 4cf65afd90f4
children
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rev   line source
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4cf65afd90f4 mod_devices: New module for device identification
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1 local it = require "util.iterators";
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2 local new_id = require "util.id".medium;
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3
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4 local max_user_devices = module:get_option_number("max_user_devices", 5);
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5
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6 local device_store = module:open_store("devices");
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7 local device_map_store = module:open_store("devices", "map");
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8
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9 --- Helper functions
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10
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11 local function _compare_device_timestamps(a, b)
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12 return (a.last_activity_at or 0) < (b.last_activity_at or 0);
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13 end
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14 local function sorted_devices(devices)
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15 return it.sorted_pairs(devices, _compare_device_timestamps);
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16 end
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17
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18 local function new_device(username, alt_ids)
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19 local current_time = os.time();
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20 local device = {
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21 id = "dv-"..new_id();
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22 created_at = current_time;
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23 last_activity = "created";
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24 last_activity_at = current_time;
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25 alt_ids = alt_ids or {};
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26 };
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27
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28 local devices = device_store:get(username);
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29 if not devices then
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30 devices = {};
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31 end
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32 devices[device.id] = device;
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33 local devices_ordered = {};
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34 for id in sorted_devices(devices) do
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35 table.insert(devices_ordered, id);
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36 end
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37 if #devices_ordered > max_user_devices then
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38 -- Iterate through oldest devices that are above limit, backwards
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39 for i = #devices_ordered, max_user_devices+1, -1 do
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40 local id = table.remove(devices_ordered, i);
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41 devices[id] = nil;
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42 module:log("debug", "Removing old device for %s: %s", username, id);
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43 end
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44 end
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45 device_store:set(username, devices);
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46 return device;
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47 end
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48
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49 local function get_device_with_alt_id(username, alt_id_type, alt_id)
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50 local devices = device_store:get(username);
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51 if not devices then
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52 return nil;
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53 end
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54
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55 for _, device in pairs(devices) do
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56 if device.alt_ids[alt_id_type] == alt_id then
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57 return device;
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58 end
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59 end
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60 end
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61
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62 local function set_device_alt_id(username, device_id, alt_id_type, alt_id)
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63 local devices = device_store:get(username);
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64 if not devices or not devices[device_id] then
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65 return nil, "no such device";
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66 end
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67 devices[device_id].alt_ids[alt_id_type] = alt_id;
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68 end
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69
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70 local function record_device_state(username, device_id, activity, time)
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71 local device = device_map_store:get(username, device_id);
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72 device.last_activity = activity;
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73 device.last_activity_at = time or os.time();
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74 device_map_store:set(username, device_id, device);
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75 end
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76
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77 local function find_device(username, info)
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78 for _, alt_id_type in ipairs({ "resumption_token", "resource" }) do
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79 local alt_id = info[alt_id_type];
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80 if alt_id then
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81 local device = get_device_with_alt_id(username, alt_id_type, alt_id);
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82 if device then
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83 return device, alt_id_type;
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84 end
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85 end
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86 end
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87 end
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88
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89 --- Information gathering
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90
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91 module:hook("pre-resource-bind", function (event)
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92 event.session.device_requested_resource = event.resource;
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93 end, 1000);
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94
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95
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96 local function store_resumption_token(session, stanza)
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97 session.device_requested_resume = stanza.attr.previd;
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98 end
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99 module:hook_stanza("urn:xmpp:sm:2", "resume", store_resumption_token, 5);
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100 module:hook_stanza("urn:xmpp:sm:3", "resume", store_resumption_token, 5);
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101
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102 --- Identify device after resource bind
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103
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104 module:hook("resource-bind", function (event)
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105 local info = {
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106 resource = event.session.device_requested_resource;
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107 resumption_token = event.session.device_requested_resume;
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108 };
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109 local device, source = find_device(event.session.username, info);
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110 if device then
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111 event.session.log("debug", "Associated with device %s (from %s)", device.id, source);
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112 event.session.device_id = device.id;
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113 else
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114 device = new_device(event.session.username, info);
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115 event.session.log("debug", "Creating new device %s for session", device.id);
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116 event.session.device_id = device.id;
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117 end
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118 record_device_state(event.session.username, device.id, "login");
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119 end, 1000);
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120
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121 module:hook("resource-unbind", function (event)
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122 if event.session.device_id then
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123 record_device_state(event.session.username, event.session.device_id, "logout");
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124 end
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125 end);