prosody-modules
312602605269
mod_pubsub_hub/mod_pubsub_hub.lua

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mod_pubsub_hub/mod_pubsub_hub.lua @ 880:312602605269

mod_vjud: Do case-insensitive matching
author Kim Alvefur <zash@zash.se>
date Sun, 16 Dec 2012 12:29:02 +0100
parent 801:133ee88d19ae
child 1324:853a382c9bd6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 uuid = require "util.uuid".generate;
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9 local hmac_sha1 = require "util.hmac".sha1;
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10 local json_encode = require "util.json".encode;
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11 local time = os.time;
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12 local m_min, m_max = math.min, math.max;
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13 local tostring = tostring;
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14 local xmlns_pubsub = "http://jabber.org/protocol/pubsub";
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15 local xmlns_pubsub_event = xmlns_pubsub .. "#event";
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16 local subs_by_topic = module:shared"subscriptions";
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17
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18 local max_lease, min_lease, default_lease = 86400, 600, 3600;
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19
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20 module:depends"pubsub";
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21
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22 local valid_modes = { ["subscribe"] = true, ["unsubscribe"] = true, }
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23
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24 local function do_subscribe(subscription)
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25 -- FIXME handle other states
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26 if subscription.state == "subscribed" then
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27 local ok, err = hosts[module.host].modules.pubsub.service:add_subscription(subscription.topic, true, module.host);
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28 module:log(ok and "debug" or "error", "add_subscription() => %s, %s", tostring(ok), tostring(err));
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29 end
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30 end
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31
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32 local function handle_request(event)
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33 local request, response = event.request, event.response;
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34 local method, body = request.method, request.body;
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35
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36 local query = request.url.query or {};
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37 if query and type(query) == "string" then
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38 query = formdecode(query);
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39 end
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40 if body and request.headers.content_type == "application/x-www-form-urlencoded" then
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41 body = formdecode(body);
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42 end
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43
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44 if method == "POST" then
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45 -- Subscription request
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46 if body["hub.callback"] and body["hub.mode"] and valid_modes[body["hub.mode"]]
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47 and body["hub.topic"] and body["hub.verify"] then
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48
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49 -- http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html#anchor5
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50 local callback = body["hub.callback"];
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51 local mode = body["hub.mode"];
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52 local topic = body["hub.topic"];
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53 local lease_seconds = m_max(min_lease, m_min(tonumber(body["hub.lease_seconds"]) or default_lease, max_lease));
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54 local secret = body["hub.secret"];
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55 local verify_token = body["hub.verify_token"];
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56
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57 module:log("debug", "topic is "..(type(topic)=="string" and "%q" or "%s"), topic);
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58
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59 if not subs_by_topic[topic] then
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60 subs_by_topic[topic] = {};
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61 end
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62 local subscription = subs_by_topic[topic][callback];
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63
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64 local verify_modes = {};
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65 for i=1,#body do
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66 if body[i].name == "hub.verify" then
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67 verify_modes[body[i].value] = true;
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68 end
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69 end
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70
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71 subscription = subscription or {
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72 id = uuid(),
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73 callback = callback,
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74 topic = topic,
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75 state = "unsubscribed",
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76 secret = secret,
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77 want_state = mode,
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78 lease_seconds = lease_seconds,
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79 expires = time() + lease_seconds,
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80 };
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81 subs_by_topic[topic][callback] = subscription;
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82 local challenge = uuid();
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83
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84 local callback_url = callback .. (callback:match("%?") and "&" or "?") .. formencode{
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85 ["hub.mode"] = mode,
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86 ["hub.topic"] = topic,
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87 ["hub.challenge"] = challenge,
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88 ["hub.lease_seconds"] = tostring(lease_seconds),
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89 ["hub.verify_token"] = verify_token,
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90 }
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91 module:log("debug", require"util.serialization".serialize(verify_modes));
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92 if verify_modes["async"] then
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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 elseif verify_modes["sync"] then
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112 http.request(callback_url, nil, function(body, code)
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113 if body == challenge and code > 199 and code < 300 then
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114 if not subscription.want_state then
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115 module:log("warn", "Verification of already verified request, probably");
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116 return;
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117 end
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118 if mode == "unsubscribe" then
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119 subs_by_topic[topic][callback] = nil;
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120 else
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121 subscription.state = subscription.want_state .. "d";
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122 subscription.want_state = nil;
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123 module:log("debug", "calling do_subscribe()");
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124 do_subscribe(subscription);
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125 subs_by_topic[topic][callback] = subscription;
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126 end
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127 else
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128 subs_by_topic[topic][callback] = subscription;
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129 end
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130 response.status = 204;
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131 response:send();
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132 end)
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133 return true;
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134 end
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135 return 400;
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136 else
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137 response.status = 400;
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138 response.headers.content_type = "text/html";
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139 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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140 end
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141 end
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142 end
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143
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144 local function periodic()
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145 local now = time();
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146 local next_check = now + max_lease;
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147 local purge = false;
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148 for topic, callbacks in pairs(subs_by_topic) do
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149 for callback, subscription in pairs(callbacks) do
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150 if subscription.mode == "subscribed" then
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151 if subscription.expires < now then
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152 -- Subscription has expired, drop it.
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153 purge = true;
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154 elseif subscription.expires < now + min_lease then
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155 -- Subscription set to expire soon, re-confirm it.
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156 local challenge = uuid();
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157 local callback_url = callback .. (callback:match("%?") and "&" or "?") .. formencode{
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158 ["hub.mode"] = subscription.state,
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159 ["hub.topic"] = topic,
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160 ["hub.challenge"] = challenge,
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161 ["hub.lease_seconds"] = subscription.lease_seconds,
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162 ["hub.verify_token"] = subscription.verify_token,
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163 }
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164 http.request(callback_url, nil, function(body, code)
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165 if body == challenge and code > 199 and code < 300 then
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166 subscription.expires = now + subscription.lease_seconds;
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167 end
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168 end);
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169 else
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170 next_check = m_min(next_check, subscription.expires);
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171 end
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172 end
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173 end
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174 if purge then
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175 local new_callbacks = {};
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176 for callback, subscription in pairs(callbacks) do
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177 if (subscription.state == "subscribed" and subscription.expires < now)
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178 and subscription.want_state ~= "remove" then
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179 new_callbacks[callback] = subscription;
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180 end
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181 end
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182 subs_by_topic[topic] = new_callbacks;
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183 purge = false;
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184 end
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185 end
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186 return m_max((now - next_check) - min_lease, min_lease);
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187 end
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188
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189 local xmlns_atom = "http://www.w3.org/2005/Atom";
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190 local st = require "util.stanza";
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191
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192 local function on_notify(subscription, content)
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193 if content.attr and content.attr.xmlns == xmlns_atom then
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194 -- COMPAT This is required by the PubSubHubbub spec.
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195 content = st.stanza("feed", {xmlns=xmlns_atom}):add_child(content);
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196 end
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197 local body = tostring(content);
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198 local headers = {
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199 ["Content-Type"] = "application/xml",
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200 };
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201 if subscription.secret then
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202 headers["X-Hub-Signature"] = "sha1="..hmac_sha1(subscription.secret, body, true);
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203 end
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204 http.request(subscription.callback, { method = "POST", body = body, headers = headers }, function(body, code)
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205 if code >= 200 and code <= 299 then
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206 module:log("debug", "Delivered");
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207 else
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208 module:log("warn", "Got status code %d on delivery to %s", tonumber(code) or -1, tostring(subscription.callback));
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209 -- TODO Retry
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210 -- ... but the spec says that you should not retry, wtf?
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211 end
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212 end);
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213 end
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214
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diff changeset
215 module:hook("message/host", function(event)
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216 local stanza = event.stanza;
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217 if stanza.attr.from ~= module.host then return end;
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218
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diff changeset
219 for pubsub_event in stanza:childtags("event", xmlns_pubsub_event) do
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220 local items = pubsub_event:get_child("items");
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221 local node = items.attr.node;
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222 if items and node and subs_by_topic[node] then
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parents:
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223 for item in items:childtags("item") do
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224 local content = item.tags[1];
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225 for callback, subscription in pairs(subs_by_topic[node]) do
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226 on_notify(subscription, content)
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227 end
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228 end
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229 end
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230 end
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231 return true;
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232 end, 10);
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233
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234 module:depends"http";
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235 module:provides("http", {
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236 default_path = "/hub";
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237 route = {
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238 POST = handle_request;
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239 GET = function()
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240 return json_encode(subs_by_topic);
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241 end;
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parents:
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242 ["GET /topic/*"] = function(event, path)
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243 return json_encode(subs_by_topic[path])
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244 end;
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245 };
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246 });
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247
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parents:
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248 module:add_timer(1, periodic);