Annotate

mod_unified_push/mod_unified_push.lua @ 5489:a7188eb4ded4

mod_http_debug: Add a brief README
author Kim Alvefur <zash@zash.se>
date Fri, 26 May 2023 15:20:04 +0200
parent 5155:18ed655c755d
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rev   line source
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1 local unified_push_secret = module:get_option_string("unified_push_secret");
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2 local push_registration_ttl = module:get_option_number("unified_push_registration_ttl", 86400);
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3
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4 local base64 = require "util.encodings".base64;
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5 local datetime = require "util.datetime";
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6 local id = require "util.id";
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7 local jid = require "util.jid";
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8 local jwt = require "util.jwt";
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9 local st = require "util.stanza";
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10 local urlencode = require "util.http".urlencode;
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11
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12 local xmlns_up = "http://gultsch.de/xmpp/drafts/unified-push";
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13
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14 module:depends("http");
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15 module:depends("disco");
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16
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17 module:add_feature(xmlns_up);
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18
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19 local acl = module:get_option_set("unified_push_acl", {
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20 module:get_host_type() == "local" and module.host or module.host:match("^[^%.]+%.(.+)$")
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21 });
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22
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23 local function is_jid_permitted(user_jid)
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24 for acl_entry in acl do
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25 if jid.compare(user_jid, acl_entry) then
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26 return true;
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27 end
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28 end
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29 return false;
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30 end
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31
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32 local function check_sha256(s)
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33 if not s then return nil, "no value provided"; end
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34 local d = base64.decode(s);
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35 if not d then return nil, "invalid base64"; end
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36 if #d ~= 32 then return nil, "incorrect decoded length, expected 32"; end
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37 return s;
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38 end
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39
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40 local push_store = module:open_store();
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41
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42 local backends = {
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43 jwt = {
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44 sign = function (data)
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45 return jwt.sign(unified_push_secret, data);
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46 end;
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47
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48 verify = function (token)
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49 local ok, result = jwt.verify(unified_push_secret, token);
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50
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51 if not ok then
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52 return ok, result;
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53 end
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54 if result.exp and result.exp < os.time() then
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55 return nil, "token-expired";
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56 end
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57 return ok, result;
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58 end;
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59 };
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60
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61 storage = {
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62 sign = function (data)
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63 local reg_id = id.long();
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64 local ok, err = push_store:set(reg_id, data);
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65 if not ok then
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66 return nil, err;
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67 end
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68 return reg_id;
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69 end;
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70 verify = function (token)
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71 if token == "_private" then return nil, "invalid-token"; end
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72 local data = push_store:get(token);
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73 if not data then
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74 return nil, "item-not-found";
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75 elseif data.exp and data.exp < os.time() then
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76 push_store:set(token, nil);
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77 return nil, "token-expired";
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78 end
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79 return true, data;
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80 end;
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81 };
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82 };
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83
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84 if pcall(require, "util.paseto") and require "util.paseto".v3_local then
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85 local paseto = require "util.paseto".v3_local;
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86 local state = push_store:get("_private");
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87 local key = state and state.paseto_v3_local_key;
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88 if not key then
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89 key = paseto.new_key();
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90 push_store:set("_private", { paseto_v3_local_key = key });
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91 end
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92 local sign, verify = paseto.init(key);
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93 backends.paseto = {
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94 sign = sign;
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95 verify = function (token)
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96 local payload, err = verify(token);
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97 if not payload then
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98 return nil, err;
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99 end
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100 return true, payload;
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101 end;
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102 };
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103 end
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104
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105 local backend = module:get_option_string("unified_push_backend", backends.paseto and "paseto" or "storage");
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106
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107 assert(backend ~= "jwt" or unified_push_secret, "required option missing: unified_push_secret");
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108
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109 local function register_route(params)
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110 local expiry = os.time() + push_registration_ttl;
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111 local token, err = backends[backend].sign({
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112 instance = params.instance;
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113 application = params.application;
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114 sub = params.jid;
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115 exp = expiry;
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116 });
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117 if not token then return nil, err; end
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118 return {
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119 url = module:http_url("push").."/"..urlencode(token);
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120 expiry = expiry;
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121 };
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122 end
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123
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124 -- Handle incoming registration from XMPP client
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125 function handle_register(event)
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126 module:log("debug", "Push registration request received");
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127 local origin, stanza = event.origin, event.stanza;
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128 if not is_jid_permitted(stanza.attr.from) then
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129 module:log("debug", "Sender <%s> not permitted to register on this UnifiedPush service", stanza.attr.from);
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130 return origin.send(st.error_reply(stanza, "auth", "forbidden"));
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131 end
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132 local instance, instance_err = check_sha256(stanza.tags[1].attr.instance);
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133 if not instance then
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134 return origin.send(st.error_reply(stanza, "modify", "bad-request", "instance: "..instance_err));
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135 end
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136 local application, application_err = check_sha256(stanza.tags[1].attr.application);
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137 if not application then
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138 return origin.send(st.error_reply(stanza, "modify", "bad-request", "application: "..application_err));
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139 end
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140
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141 local route, register_err = register_route({
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142 instance = instance;
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143 application = application;
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144 jid = stanza.attr.from;
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145 });
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146
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147 if not route then
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148 module:log("warn", "Failed to create registration using %s backend: %s", backend, register_err);
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149 return origin.send(st.error_reply(stanza, "wait", "internal-server-error"));
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150 end
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151
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152 module:log("debug", "New push registration successful");
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153 return origin.send(st.reply(stanza):tag("registered", {
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154 expiration = datetime.datetime(route.expiry);
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155 endpoint = route.url;
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156 xmlns = xmlns_up;
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157 }));
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158 end
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159
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160 module:hook("iq-set/host/"..xmlns_up..":register", handle_register);
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161
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162 -- Handle incoming POST
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163 function handle_push(event, subpath)
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164 module:log("debug", "Incoming push received!");
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165 local ok, data = backends[backend].verify(subpath);
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166 if not ok then
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167 module:log("debug", "Received push to unacceptable token (%s)", data);
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168 return 404;
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169 end
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170 local payload = event.request.body;
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171 if not payload or payload == "" then
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172 module:log("warn", "Missing or empty push payload");
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173 return 400;
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174 elseif #payload > 4096 then
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175 module:log("warn", "Push payload too large");
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176 return 413;
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177 end
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178 local push_id = event.request.id or id.short();
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179 module:log("debug", "Push notification received [%s], relaying to device...", push_id);
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180 local push_iq = st.iq({ type = "set", to = data.sub, from = module.host, id = push_id })
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181 :text_tag("push", base64.encode(payload), { instance = data.instance, application = data.application, xmlns = xmlns_up });
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182 return module:send_iq(push_iq):next(function ()
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183 module:log("debug", "Push notification delivered [%s]", push_id);
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184 return 201;
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185 end, function (error_event)
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186 local e_type, e_cond, e_text = error_event.stanza:get_error();
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187 if e_cond == "item-not-found" or e_cond == "feature-not-implemented" then
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188 module:log("debug", "Push rejected [%s]", push_id);
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189 return 404;
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190 elseif e_cond == "service-unavailable" or e_cond == "recipient-unavailable" then
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191 module:log("debug", "Recipient temporarily unavailable [%s]", push_id);
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192 return 503;
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193 end
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194 module:log("warn", "Unexpected push error response: %s/%s/%s", e_type, e_cond, e_text);
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195 return 500;
7cc0f68b8715 mod_unified_push: Experimenal Unified Push provider
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196 end);
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197 end
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198
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parents:
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199 module:provides("http", {
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200 name = "push";
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parents:
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201 route = {
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202 ["GET /*"] = function (event)
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203 event.response.headers.content_type = "application/json";
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parents:
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204 return [[{"unifiedpush":{"version":1}}]];
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parents:
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205 end;
7cc0f68b8715 mod_unified_push: Experimenal Unified Push provider
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206 ["POST /*"] = handle_push;
7cc0f68b8715 mod_unified_push: Experimenal Unified Push provider
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parents:
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207 };
7cc0f68b8715 mod_unified_push: Experimenal Unified Push provider
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208 });