prosody-modules
80830d97da81
mod_invites/mod_invites.lua

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mod_invites/mod_invites.lua @ 3776:80830d97da81

mod_invites: New module providing an API to create/manage invite tokens
author Matthew Wild <mwild1@gmail.com>
date Fri, 27 Dec 2019 10:31:33 +0000
child 4077:f85ea76447dd
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3776
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1 local id = require "util.id";
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2 local url = require "socket.url";
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3 local jid_node = require "util.jid".node;
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4
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5 local invite_ttl = module:get_option_number("invite_expiry", 86400 * 7);
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6
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7 local token_storage = module:open_store("invite_token", "map");
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8
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9 local function get_uri(action, jid, token, params) --> string
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10 return url.build({
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11 scheme = "xmpp",
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12 path = jid,
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13 query = action..";preauth="..token..(params and (";"..params) or ""),
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14 });
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15 end
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16
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17 local function create_invite(invite_action, invite_jid, allow_registration)
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18 local token = id.medium();
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19
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20 local created_at = os.time();
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21 local expires = created_at + invite_ttl;
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22
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23 local invite_params = (invite_action == "roster" and allow_registration) and "ibr=y" or nil;
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24
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25 local invite = {
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26 type = invite_action;
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27 jid = invite_jid;
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28
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29 token = token;
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30 allow_registration = allow_registration;
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31
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32 uri = get_uri(invite_action, invite_jid, token, invite_params);
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33
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34 created_at = created_at;
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35 expires = expires;
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36 };
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37
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38 module:fire_event("invite-created", invite);
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39
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40 if allow_registration then
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41 local ok, err = token_storage:set(nil, token, invite);
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42 if not ok then
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43 module:log("warn", "Failed to store account invite: %s", err);
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44 return nil, "internal-server-error";
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45 end
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46 end
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47
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48 if invite_action == "roster" then
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49 local username = jid_node(invite_jid);
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50 local ok, err = token_storage:set(username, token, expires);
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51 if not ok then
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52 module:log("warn", "Failed to store subscription invite: %s", err);
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53 return nil, "internal-server-error";
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54 end
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55 end
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56
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57 return invite;
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58 end
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59
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60 -- Create invitation to register an account (optionally restricted to the specified username)
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61 function create_account(account_username) --luacheck: ignore 131/create_account
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62 local jid = account_username and (account_username.."@"..module.host) or module.host;
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63 return create_invite("register", jid, true);
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64 end
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65
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66 -- Create invitation to become a contact of a local user
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67 function create_contact(username, allow_registration) --luacheck: ignore 131/create_contact
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68 return create_invite("roster", username.."@"..module.host, allow_registration);
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69 end
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70
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71 local valid_invite_methods = {};
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72 local valid_invite_mt = { __index = valid_invite_methods };
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73
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74 function valid_invite_methods:use()
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75 if self.username then
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76 -- Also remove the contact invite if present, on the
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77 -- assumption that they now have a mutual subscription
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78 token_storage:set(self.username, self.token, nil);
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79 end
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80 token_storage:set(nil, self.token, nil);
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81 return true;
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82 end
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83
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84 -- Get a validated invite (or nil, err). Must call :use() on the
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85 -- returned invite after it is actually successfully used
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86 -- For "roster" invites, the username of the local user (who issued
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87 -- the invite) must be passed.
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88 -- If no username is passed, but the registration is a roster invite
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89 -- from a local user, the "inviter" field of the returned invite will
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90 -- be set to their username.
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91 function get(token, username)
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92 if not token then
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93 return nil, "no-token";
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94 end
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95
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96 local valid_until, inviter;
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97
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98 if username then -- token being used for subscription
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99 -- Fetch from user store (subscription invite)
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100 valid_until = token_storage:get(username, token);
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101 else -- token being used for account creation
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102 -- Fetch from host store (account invite)
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103 local token_info = token_storage:get(nil, token);
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104 valid_until = token_info and token_info.expires;
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105 if token_info.type == "roster" then
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106 username = jid_node(token_info.jid);
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107 inviter = username;
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108 end
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109 end
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110
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111 if not valid_until then
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112 module:log("debug", "Got unknown token: %s", token);
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113 return nil, "token-invalid";
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114 elseif os.time() > valid_until then
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115 module:log("debug", "Got expired token: %s", token);
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116 return nil, "token-expired";
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117 end
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118
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119 return setmetatable({
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120 token = token;
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121 username = username;
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122 inviter = inviter;
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123 }, valid_invite_mt);
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124 end
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125
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126 function use(token) --luacheck: ignore 131/use
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127 local invite = get(token);
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128 return invite and invite:use();
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129 end