Mercurial > prosody-modules

annotate mod_pubsub_hub/mod_pubsub_hub.lua @ 4191:e2728b540223

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Merge
author JC Brand <jc@opkode.com>
date Mon, 12 Oct 2020 18:04:05 +0200
parents 4cec8b7aed6d
children
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rev   line source
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d11d91ee81ed mod_pubsub_hub: New module that implements the Hub part of PubSubHubbub
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1 -- Copyright (C) 2011 - 2012 Kim Alvefur
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2 --
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3 -- This file is MIT/X11 licensed.
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4
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5 local http = require "net.http";
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6 local formdecode = http.formdecode;
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7 local formencode = http.formencode;
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8 local http_request = http.request;
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9 local uuid = require "util.uuid".generate;
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10 local hmac_sha1 = require "util.hmac".sha1;
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11 local json_encode = require "util.json".encode;
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12 local time = os.time;
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13 local m_min, m_max = math.min, math.max;
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14 local tostring = tostring;
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15
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16 local xmlns_pubsub = "http://jabber.org/protocol/pubsub";
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17 local xmlns_pubsub_event = xmlns_pubsub .. "#event";
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18 local subs_by_topic = module:shared"subscriptions";
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19
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20 local max_lease, min_lease, default_lease = 86400, 600, 3600;
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21
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22 module:depends"pubsub";
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24 local valid_modes = { ["subscribe"] = true, ["unsubscribe"] = true, }
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26 local function do_subscribe(subscription)
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27 -- FIXME handle other states
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28 if subscription.state == "subscribed" then
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29 local ok, err = hosts[module.host].modules.pubsub.service:add_subscription(subscription.topic, true, module.host);
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30 module:log(ok and "debug" or "error", "add_subscription() => %s, %s", tostring(ok), tostring(err));
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31 end
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32 end
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33
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34 local function handle_request(event)
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35 local request, response = event.request, event.response;
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36 local method, body = request.method, request.body;
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37
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38 local query = request.url.query or {};
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39 if query and type(query) == "string" then
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40 query = formdecode(query);
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41 end
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42 if body and request.headers.content_type == "application/x-www-form-urlencoded" then
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43 body = formdecode(body);
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44 end
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45
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46 if method == "POST" then
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47 -- Subscription request
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48 if body["hub.callback"] and body["hub.mode"] and valid_modes[body["hub.mode"]]
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49 and body["hub.topic"] and body["hub.verify"] then
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50
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51 -- http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html#anchor5
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52 local callback = body["hub.callback"];
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53 local mode = body["hub.mode"];
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54 local topic = body["hub.topic"];
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55 local lease_seconds = m_max(min_lease, m_min(tonumber(body["hub.lease_seconds"]) or default_lease, max_lease));
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56 local secret = body["hub.secret"];
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57 local verify_token = body["hub.verify_token"];
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58
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59 module:log("debug", "topic is "..(type(topic)=="string" and "%q" or "%s"), tostring(topic));
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61 if not subs_by_topic[topic] then
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62 subs_by_topic[topic] = {};
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63 end
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64 local subscription = subs_by_topic[topic][callback];
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65
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66 local verify_modes = {};
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67 for i=1,#body do
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68 if body[i].name == "hub.verify" then
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69 verify_modes[body[i].value] = true;
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70 end
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71 end
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72
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73 subscription = subscription or {
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74 id = uuid(),
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75 callback = callback,
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76 topic = topic,
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77 state = "unsubscribed",
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78 secret = secret,
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79 want_state = mode,
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80 };
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81 subscription.lease_seconds = lease_seconds;
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82 subscription.expires = time() + lease_seconds;
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83 subs_by_topic[topic][callback] = subscription;
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84 local challenge = uuid();
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85
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86 local callback_url = callback .. (callback:match("%?") and "&" or "?") .. formencode{
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87 ["hub.mode"] = mode,
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88 ["hub.topic"] = topic,
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89 ["hub.challenge"] = challenge,
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90 ["hub.lease_seconds"] = tostring(lease_seconds),
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91 ["hub.verify_token"] = verify_token, -- COMPAT draft version 0.3
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92 }
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93 module:log("debug", "Sending async verification request to %s for %s", tostring(callback_url), tostring(subscription));
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94 http_request(callback_url, nil, function(body, code)
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95 if body == challenge and code > 199 and code < 300 then
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96 if not subscription.want_state then
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97 module:log("warn", "Verification of already verified request, probably");
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98 return;
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99 end
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100 subscription.state = subscription.want_state .. "d";
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101 subscription.want_state = nil;
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102 module:log("debug", "calling do_subscribe()");
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103 do_subscribe(subscription);
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104 subs_by_topic[topic][callback] = subscription;
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105 else
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106 module:log("warn", "status %d and body was %q", tostring(code), tostring(body));
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107 subs_by_topic[topic][callback] = subscription;
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108 end
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109 end)
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110 return 202;
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111 else
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112 response.status = 400;
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113 response.headers.content_type = "text/html";
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114 return "<h1>Bad Request</h1>\n<a href='http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html#anchor5'>Missing required parameter(s)</a>\n"
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115 end
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116 end
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117 end
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118
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119 local function periodic(now)
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120 local next_check = now + max_lease;
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121 local purge = false;
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122 for topic, callbacks in pairs(subs_by_topic) do
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123 for callback, subscription in pairs(callbacks) do
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124 if subscription.mode == "subscribed" then
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125 if subscription.expires < now then
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126 -- Subscription has expired, drop it.
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127 purge = true;
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128 else
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129 next_check = m_min(next_check, subscription.expires);
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130 end
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131 end
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132 end
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133 if purge then
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134 local new_callbacks = {};
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135 for callback, subscription in pairs(callbacks) do
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136 if (subscription.state == "subscribed" and subscription.expires < now)
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137 and subscription.want_state ~= "remove" then
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138 new_callbacks[callback] = subscription;
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139 end
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140 end
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141 subs_by_topic[topic] = new_callbacks;
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142 purge = false;
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143 end
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144 end
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145 return m_max((now - next_check) - min_lease, min_lease);
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146 end
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147
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148 local xmlns_atom = "http://www.w3.org/2005/Atom";
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149 local st = require "util.stanza";
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150
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151 local function on_notify(subscription, content)
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152 if content.attr and content.attr.xmlns == xmlns_atom then
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153 -- COMPAT This is required by the PubSubHubbub spec.
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154 content = st.stanza("feed", {xmlns=xmlns_atom}):add_child(content);
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155 end
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156 local body = tostring(content);
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157 local headers = {
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158 ["Content-Type"] = "application/atom+xml",
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159 };
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160 if subscription.secret then
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161 headers["X-Hub-Signature"] = "sha1="..hmac_sha1(subscription.secret, body, true);
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162 end
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163 http_request(subscription.callback, { method = "POST", body = body, headers = headers }, function(body, code)
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164 if code >= 200 and code <= 299 then
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165 module:log("debug", "Delivered");
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166 else
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167 module:log("warn", "Got status code %d on delivery to %s", tonumber(code) or -1, tostring(subscription.callback));
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168 -- TODO Retry
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169 -- ... but the spec says that you should not retry, wtf?
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170 end
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171 end);
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172 end
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173
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174 module:hook("message/host", function(event)
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175 local stanza = event.stanza;
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176 if stanza.attr.from ~= module.host then return end;
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177
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178 for pubsub_event in stanza:childtags("event", xmlns_pubsub_event) do
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179 local items = pubsub_event:get_child("items");
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180 local node = items.attr.node;
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181 if items and node and subs_by_topic[node] then
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182 for item in items:childtags("item") do
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183 local content = item.tags[1];
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184 for callback, subscription in pairs(subs_by_topic[node]) do
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185 on_notify(subscription, content)
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186 end
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187 end
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188 end
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189 end
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190 return true;
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191 end, 10);
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192
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193 module:depends"http";
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194 module:provides("http", {
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195 default_path = "/hub";
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196 route = {
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197 POST = handle_request;
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198 GET = function()
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199 return json_encode(subs_by_topic);
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200 end;
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201 ["GET /topic/*"] = function(event, path)
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202 return json_encode(subs_by_topic[path])
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203 end;
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204 };
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205 });
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206
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207 module:add_timer(1, periodic);