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mod_pubsub_hub/mod_pubsub_hub.lua @ 1020:9839198539c8
mod_admin_web: Fix indentation
author | Florian Zeitz <florob@babelmonkeys.de> |
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date | Fri, 24 May 2013 15:46:23 +0200 |
parent | 801:133ee88d19ae |
child | 1324:853a382c9bd6 |
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 |
801
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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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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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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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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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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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248 module:add_timer(1, periodic); |