prosody-modules
26559776a87e
mod_easy_invite/mod_easy_invite.lua

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mod_easy_invite/mod_easy_invite.lua @ 3777:26559776a87e

mod_easy_invite: New module that implements XEP-0401/XEP-0379
author Matthew Wild <mwild1@gmail.com>
date Fri, 27 Dec 2019 10:41:01 +0000
child 3778:7209f481bcfe
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1 -- XEP-0401: Easy User Onboarding
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2 local dataforms = require "util.dataforms";
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3 local datetime = require "util.datetime";
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4 local jid_bare = require "util.jid".bare;
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5 local jid_split = require "util.jid".split;
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6 local split_jid = require "util.jid".split;
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7 local rostermanager = require "core.rostermanager";
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8 local st = require "util.stanza";
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9
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10 local invite_only = module:get_option_boolean("registration_invite_only", true);
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11 local require_encryption = module:get_option_boolean("c2s_require_encryption",
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12 module:get_option_boolean("require_encryption", false));
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13
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14 local new_adhoc = module:require("adhoc").new;
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15
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16 -- Whether local users can invite other users to create an account on this server
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17 local allow_user_invites = module:get_option_boolean("allow_user_invites", true);
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18
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19 local invites = module:depends("invites");
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20
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21 local invite_result_form = dataforms.new({
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22 title = "Your Invite",
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23 -- TODO instructions = something helpful
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24 {
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25 name = "uri";
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26 label = "Invite URI";
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27 -- TODO desc = something helpful
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28 },
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29 {
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30 name = "url" ;
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31 var = "landing-url";
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32 label = "Invite landing URL";
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33 },
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34 {
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35 name = "expire";
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36 label = "Token valid until";
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37 },
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38 });
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39
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40 module:depends("adhoc");
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41 module:provides("adhoc", new_adhoc("New Invite", "urn:xmpp:invite#invite",
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42 function (_, data)
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43 local username = split_jid(data.from);
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44 local invite = invites.create_contact(username, allow_user_invites);
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45 --TODO: check errors
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46 return {
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47 status = "completed";
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48 form = {
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49 layout = invite_result_form;
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50 values = {
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51 uri = invite.uri;
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52 url = invite.landing_page;
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53 expire = datetime.datetime(invite.expires);
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54 };
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55 };
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56 };
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57 end, "local_user"));
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58
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59
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60 -- TODO
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61 -- module:provides("adhoc", new_adhoc("Create account", "urn:xmpp:invite#create-account", function () end, "admin"));
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62
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63 -- XEP-0379: Pre-Authenticated Roster Subscription
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64 module:hook("presence/bare", function (event)
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65 local stanza = event.stanza;
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66 if stanza.attr.type ~= "subscribe" then return end
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67
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68 local preauth = stanza:get_child("preauth", "urn:xmpp:pars:0");
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69 if not preauth then return end
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70 local token = preauth.attr.token;
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71 if not token then return end
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72
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73 local username, host = jid_split(stanza.attr.to);
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74
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75 local invite, err = invites.get(token, username);
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76
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77 if not invite then
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78 module:log("debug", "Got invalid token, error: %s", err);
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79 return;
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80 end
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81
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82 local contact = jid_bare(stanza.attr.from);
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83
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84 module:log("debug", "Approving inbound subscription to %s from %s", username, contact);
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85 if rostermanager.set_contact_pending_in(username, host, contact, stanza) then
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86 if rostermanager.subscribed(username, host, contact) then
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87 invite:use();
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88 rostermanager.roster_push(username, host, contact);
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89
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90 -- Send back a subscription request (goal is mutual subscription)
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91 if not rostermanager.is_user_subscribed(username, host, contact)
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92 and not rostermanager.is_contact_pending_out(username, host, contact) then
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93 module:log("debug", "Sending automatic subscription request to %s from %s", contact, username);
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94 if rostermanager.set_contact_pending_out(username, host, contact) then
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95 rostermanager.roster_push(username, host, contact);
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96 module:send(st.presence({type = "subscribe", to = contact }));
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97 else
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98 module:log("warn", "Failed to set contact pending out for %s", username);
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99 end
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100 end
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101 end
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102 end
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103 end, 1);
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104
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105 -- TODO sender side, magic automatic mutual subscription
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106
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107 local invite_stream_feature = st.stanza("register", { xmlns = "urn:xmpp:invite" }):up();
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108 module:hook("stream-features", function(event)
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109 local session, features = event.origin, event.features;
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110
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111 -- Advertise to unauthorized clients only.
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112 if session.type ~= "c2s_unauthed" or (require_encryption and not session.secure) then
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113 return
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114 end
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115
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116 features:add_child(invite_stream_feature);
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117 end);
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118
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119 -- Client is submitting a preauth token to allow registration
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120 module:hook("stanza/iq/urn:xmpp:pars:0:preauth", function(event)
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121 local preauth = event.stanza.tags[1];
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122 local token = preauth.attr.token;
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123 local validated_invite = invites.get(token);
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124 if not validated_invite then
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125 local reply = st.error_reply(event.stanza, "cancel", "forbidden", "The invite token is invalid or expired");
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126 event.origin.send(reply);
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127 return true;
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128 end
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129 event.origin.validated_invite = validated_invite;
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130 local reply = st.reply(event.stanza);
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131 event.origin.send(reply);
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132 return true;
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133 end);
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134
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135 -- Registration attempt - ensure a valid preauth token has been supplied
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136 module:hook("user-registering", function (event)
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137 local validated_invite = event.session.validated_invite;
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138 if invite_only and not validated_invite then
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139 event.allowed = false;
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140 event.reason = "Registration on this server is through invitation only";
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141 return;
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142 end
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143 end);
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144
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145 -- Make a *one-way* subscription. User will see when contact is online,
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146 -- contact will not see when user is online.
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147 function subscribe(host, user_username, contact_username)
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148 local user_jid = user_username.."@"..host;
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149 local contact_jid = contact_username.."@"..host;
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150 -- Update user's roster to say subscription request is pending...
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151 rostermanager.set_contact_pending_out(user_username, host, contact_jid);
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152 -- Update contact's roster to say subscription request is pending...
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153 rostermanager.set_contact_pending_in(contact_username, host, user_jid);
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154 -- Update contact's roster to say subscription request approved...
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155 rostermanager.subscribed(contact_username, host, user_jid);
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156 -- Update user's roster to say subscription request approved...
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157 rostermanager.process_inbound_subscription_approval(user_username, host, contact_jid);
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158 end
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159
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160 -- Make a mutual subscription between jid1 and jid2. Each JID will see
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161 -- when the other one is online.
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162 function subscribe_both(host, user1, user2)
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163 subscribe(host, user1, user2);
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164 subscribe(host, user2, user1);
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165 end
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166
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167 -- Registration successful, if there was a preauth token, mark it as used
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168 module:hook("user-registered", function (event)
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169 local validated_invite = event.session.validated_invite;
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170 if not validated_invite then
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171 return;
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172 end
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173 local inviter_username = validated_invite.inviter;
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174 validated_invite:use();
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175
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176 if not inviter_username then return; end
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177
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178 local contact_username = event.username;
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179
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180 module:log("debug", "Creating mutual subscription between %s and %s", inviter_username, contact_username);
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181 subscribe_both(module.host, inviter_username, contact_username);
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182 end);