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annotate mod_unified_push/mod_unified_push.lua @ 5152:342baedbd1c8

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mod_unified_push: Fix storage backend error behaviours and return values
author Matthew Wild <mwild1@gmail.com>
date Sat, 14 Jan 2023 16:15:35 +0000
parents 514c8a0e9aa1
children d69cc9a23fad
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1 local unified_push_secret = assert(module:get_option_string("unified_push_secret"), "required option: 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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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 = { sign = sign, verify = verify };
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94 end
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95
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96 local backend = module:get_option_string("unified_push_backend", backends.paseto and "paseto" or "storage");
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97
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98 local function register_route(params)
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99 local expiry = os.time() + push_registration_ttl;
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100 local token = backends[backend].sign({
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101 instance = params.instance;
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102 application = params.application;
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103 sub = params.jid;
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104 exp = expiry;
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105 });
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106 return {
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107 url = module:http_url("push").."/"..urlencode(token);
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108 expiry = expiry;
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109 };
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110 end
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111
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112 -- Handle incoming registration from XMPP client
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113 function handle_register(event)
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114 local origin, stanza = event.origin, event.stanza;
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115 if not is_jid_permitted(stanza.attr.from) then
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116 return st.error_reply(stanza, "auth", "forbidden");
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117 end
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118 local instance, instance_err = check_sha256(stanza.tags[1].attr.instance);
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119 if not instance then
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120 return st.error_reply(stanza, "modify", "bad-request", "instance: "..instance_err);
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121 end
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122 local application, application_err = check_sha256(stanza.tags[1].attr.application);
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123 if not application then
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124 return st.error_reply(stanza, "modify", "bad-request", "application: "..application_err);
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125 end
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126 local route = register_route({
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127 instance = instance;
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128 application = application;
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129 jid = stanza.attr.from;
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130 });
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131
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132 if not route then
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133 return st.error_reply(stanza, "wait", "internal-server-error");
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134 end
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135
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136 module:log("debug", "New push registration successful");
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137 return origin.send(st.reply(stanza):tag("registered", {
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138 expiration = datetime.datetime(route.expiry);
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139 endpoint = route.url;
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140 xmlns = xmlns_up;
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141 }));
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142 end
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143
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144 module:hook("iq-set/host/"..xmlns_up..":register", handle_register);
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145
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146 -- Handle incoming POST
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147 function handle_push(event, subpath)
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148 module:log("debug", "Incoming push received!");
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149 local ok, data = backends[backend].verify(subpath);
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150 if not ok then
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151 module:log("debug", "Received push to unacceptable token (%s)", data);
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152 return 404;
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153 end
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154 local payload = event.request.body;
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155 if not payload or payload == "" then
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156 module:log("warn", "Missing or empty push payload");
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157 return 400;
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158 elseif #payload > 4096 then
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159 module:log("warn", "Push payload too large");
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160 return 413;
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161 end
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162 local push_id = event.request.id or id.short();
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163 module:log("debug", "Push notification received [%s], relaying to device...", push_id);
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164 local push_iq = st.iq({ type = "set", to = data.sub, from = module.host, id = push_id })
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165 :text_tag("push", base64.encode(payload), { instance = data.instance, application = data.application, xmlns = xmlns_up });
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166 return module:send_iq(push_iq):next(function ()
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167 module:log("debug", "Push notification delivered [%s]", push_id);
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168 return 201;
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169 end, function (error_event)
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170 local e_type, e_cond, e_text = error_event.stanza:get_error();
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171 if e_cond == "item-not-found" or e_cond == "feature-not-implemented" then
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172 module:log("debug", "Push rejected [%s]", push_id);
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173 return 404;
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174 elseif e_cond == "service-unavailable" or e_cond == "recipient-unavailable" then
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175 module:log("debug", "Recipient temporarily unavailable [%s]", push_id);
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176 return 503;
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177 end
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178 module:log("warn", "Unexpected push error response: %s/%s/%s", e_type, e_cond, e_text);
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179 return 500;
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180 end);
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181 end
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182
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183 module:provides("http", {
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184 name = "push";
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185 route = {
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186 ["GET /*"] = function (event)
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187 event.response.headers.content_type = "application/json";
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188 return [[{"unifiedpush":{"version":1}}]];
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189 end;
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190 ["POST /*"] = handle_push;
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191 };
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192 });