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mod_pubsub_feeds/mod_pubsub_feeds.lua @ 754:713c6791fbcc
mod_smacks: Import prosody.core_process_stanza()
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 29 Jul 2012 21:38:19 +0200 |
parent | 718:a37e4149ccd1 |
child | 762:0a06cf46c263 |
rev | line source |
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1 -- Fetches Atom feeds and publishes to PubSub nodes |
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2 -- |
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3 -- Depends: http://code.matthewwild.co.uk/lua-feeds |
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4 -- |
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5 -- Config: |
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6 -- Component "pubsub.example.com" "pubsub" |
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7 -- modules_enabled = { |
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8 -- "pubsub_feeds"; |
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9 -- } |
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10 -- feeds = { -- node -> url |
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11 -- prosody_blog = "http://blog.prosody.im/feed/atom.xml"; |
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12 -- } |
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13 -- feed_pull_interval = 20 -- minutes |
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14 -- |
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15 -- Reference |
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16 -- http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html |
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17 |
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18 local modules = hosts[module.host].modules; |
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19 if not modules.pubsub or module:get_option("component_module") ~= "pubsub" then |
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20 module:log("warn", "Pubsub needs to be loaded on this host"); |
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21 --module:log("debug", "component_module is %s", tostring(module:get_option("component_module"))); |
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22 return |
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23 end |
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24 |
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25 local date, time = os.date, os.time; |
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26 local dt_parse, dt_datetime = require "util.datetime".parse, require "util.datetime".datetime; |
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27 local uuid = require "util.uuid".generate; |
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28 local hmac_sha1 = require "util.hmac".sha1; |
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29 local parse_feed = require "feeds".feed_from_string; |
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30 local st = require "util.stanza"; |
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31 --local dump = require"util.serialization".serialize; |
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32 |
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33 local xmlns_atom = "http://www.w3.org/2005/Atom"; |
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34 |
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35 local use_pubsubhubub = module:get_option_boolean("use_pubsubhubub", true); |
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36 if use_pubsubhubub then |
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37 module:depends"http"; |
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38 end |
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39 |
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40 local http = require "net.http"; |
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41 local formdecode = http.formdecode; |
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42 local formencode = http.formencode; |
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43 local urldecode = http.urldecode; |
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44 local urlencode = http.urlencode; |
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45 |
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46 local feed_list = module:shared("feed_list"); |
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47 local refresh_interval; |
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48 |
633 | 49 -- Dynamically reloadable config. |
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50 local function update_config() |
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51 local config = module:get_option("feeds") or { |
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52 planet_jabber = "http://planet.jabber.org/atom.xml"; |
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53 prosody_blog = "http://blog.prosody.im/feed/atom.xml"; |
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54 }; |
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55 refresh_interval = module:get_option_number("feed_pull_interval", 15) * 60; |
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56 local new_feed_list = {}; |
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57 for node, url in pairs(config) do |
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58 new_feed_list[node] = true; |
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59 if not feed_list[node] then |
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60 feed_list[node] = { url = url; node = node; last_update = 0 }; |
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61 else |
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62 feed_list[node].url = url; |
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63 end |
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64 end |
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65 for node in pairs(feed_list) do |
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66 if not new_feed_list[node] then |
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67 feed_list[node] = nil; |
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68 end |
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69 end |
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70 end |
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71 update_config(); |
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72 module:hook_global("config-reloaded", update_config); |
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73 |
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74 local actor = module.host.."/"..module.name; |
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75 |
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76 function update_entry(item) |
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77 local node = item.node; |
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78 module:log("debug", "parsing %d bytes of data in node %s", #item.data or 0, node) |
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79 local feed = parse_feed(item.data); |
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80 for _, entry in ipairs(feed) do |
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81 entry.attr.xmlns = xmlns_atom; |
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82 |
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83 local e_published = entry:get_child_text("published"); |
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84 e_published = e_published and dt_parse(e_published); |
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85 local e_updated = entry:get_child_text("updated"); |
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86 e_updated = e_updated and dt_parse(e_updated); |
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87 |
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88 local timestamp = e_updated or e_published or nil; |
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89 --module:log("debug", "timestamp is %s, item.last_update is %s", tostring(timestamp), tostring(item.last_update)); |
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90 if not timestamp or not item.last_update or timestamp > item.last_update then |
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91 local id = entry:get_child_text("id"); |
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92 id = id or item.url.."#"..dt_datetime(timestamp); -- Missing id, so make one up |
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93 local xitem = st.stanza("item", { id = id }):add_child(entry); |
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94 -- TODO Put data from /feed into item/source |
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95 |
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96 --module:log("debug", "publishing to %s, id %s", node, id); |
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97 local ok, err = modules.pubsub.service:publish(node, actor, id, xitem); |
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98 if not ok then |
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99 if err == "item-not-found" then -- try again |
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100 --module:log("debug", "got item-not-found, creating %s and trying again", node); |
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101 local ok, err = modules.pubsub.service:create(node, actor); |
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102 if not ok then |
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103 module:log("error", "could not create node %s: %s", node, err); |
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104 return; |
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105 end |
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106 local ok, err = modules.pubsub.service:publish(node, actor, id, xitem); |
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107 if not ok then |
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108 module:log("error", "could not create or publish node %s: %s", node, err); |
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109 return |
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110 end |
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111 else |
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112 module:log("error", "publishing %s failed: %s", node, err); |
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113 end |
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114 end |
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115 end |
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116 end |
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117 |
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118 if use_pubsubhubub and not item.subscription then |
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119 --module:log("debug", "check if %s has a hub", item.node); |
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120 local hub = feed.links and feed.links.hub; |
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121 if hub then |
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122 item.hub = hub; |
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123 module:log("debug", "%s has a hub: %s", item.node, item.hub); |
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124 subscribe(item); |
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125 end |
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126 end |
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127 end |
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128 |
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129 function fetch(item, callback) -- HTTP Pull |
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130 local headers = { }; |
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131 if item.data and item.last_update then |
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132 headers["If-Modified-Since"] = date("!%a, %d %b %Y %H:%M:%S %Z", item.last_update); |
278
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133 end |
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134 http.request(item.url, { headers = headers }, function(data, code, req) |
278
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135 if code == 200 then |
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136 item.data = data; |
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137 if callback then callback(item) end |
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138 item.last_update = time(); |
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139 elseif code == 304 then |
278
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140 item.last_update = time(); |
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141 end |
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142 end); |
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143 end |
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144 |
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145 function refresh_feeds() |
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146 local now = time(); |
322
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147 --module:log("debug", "Refreshing feeds"); |
278
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148 for node, item in pairs(feed_list) do |
322
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149 --FIXME Don't fetch feeds which have a subscription |
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150 -- Otoho, what if the subscription expires or breaks? |
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151 if item.last_update + refresh_interval < now then |
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152 --module:log("debug", "checking %s", item.node); |
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153 fetch(item, update_entry); |
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154 end |
278
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155 end |
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156 return refresh_interval; |
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157 end |
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158 |
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159 local function format_url(node) |
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160 return module:http_url(nil, "/callback") .. "?node=" .. urlencode(node); |
401
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|
161 end |
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162 |
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163 function subscribe(feed, want) |
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164 want = want or "subscribe"; |
324
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165 feed.token = uuid(); |
718
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166 feed.secret = feed.secret or uuid(); |
403
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167 local body = formencode{ |
668
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168 ["hub.callback"] = format_url(feed.node); |
718
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169 ["hub.mode"] = want; |
322
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170 ["hub.topic"] = feed.url; |
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171 ["hub.verify"] = "async"; |
324
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|
172 ["hub.verify_token"] = feed.token; |
325
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173 ["hub.secret"] = feed.secret; |
322
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174 --["hub.lease_seconds"] = ""; |
403
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|
175 }; |
322
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176 |
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177 --module:log("debug", "subscription request, body: %s", body); |
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178 |
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179 --FIXME The subscription states and related stuff |
718
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180 feed.subscription = want; |
322
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181 http.request(feed.hub, { body = body }, function(data, code, req) |
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182 module:log("debug", "subscription to %s submitted, status %s", feed.node, tostring(code)); |
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183 if code >= 400 then |
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184 module:log("error", "There was something wrong with our subscription request, body: %s", tostring(data)); |
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185 feed.subscription = "failed"; |
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186 end |
322
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|
187 end); |
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|
188 end |
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|
189 |
668
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|
190 function handle_http_request(event) |
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|
191 local request = event.request; |
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|
192 local method = request.method; |
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193 local body = request.body; |
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|
194 |
322
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|
195 --module:log("debug", "%s request to %s%s with body %s", method, request.url.path, request.url.query and "?" .. request.url.query or "", #body > 0 and body or "empty"); |
668
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|
196 local query = request.url.query or {}; --FIXME |
322
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197 if query and type(query) == "string" then |
403
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|
198 query = formdecode(query); |
322
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|
199 --module:log("debug", "GET data: %s", dump(query)); |
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|
200 end |
325
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|
201 --module:log("debug", "Headers: %s", dump(request.headers)); |
322
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|
202 |
668
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|
203 local feed = feed_list[query.node]; |
718
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204 if not feed then |
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205 return 404; |
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|
206 end |
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|
207 |
322
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|
208 if method == "GET" then |
718
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|
209 if query.node then |
323
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|
210 if query["hub.topic"] ~= feed.url then |
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|
211 module:log("debug", "Invalid topic: %s", tostring(query["hub.topic"])) |
668
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|
212 return 404 |
322
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213 end |
323
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diff
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|
214 if query["hub.mode"] ~= feed.subscription then |
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|
215 module:log("debug", "Invalid mode: %s", tostring(query["hub.mode"])) |
668
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|
216 return 400 |
323
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diff
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|
217 -- Would this work for unsubscribe? |
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|
218 -- Also, if feed.subscription is changed here, |
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|
219 -- it would probably invalidate the subscription |
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|
220 -- when/if the hub asks if it should be renewed |
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221 end |
324
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222 if query["hub.verify_token"] ~= feed.token then |
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223 module:log("debug", "Invalid verify_token: %s", tostring(query["hub.verify_token"])) |
718
a37e4149ccd1
mod_pubsub_feeds: Prepare for making it possible to unsubscribe, and some other minor changes.
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224 return 401; |
323
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mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
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225 end |
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226 module:log("debug", "Confirming %s request to %s", feed.subscription, feed.url) |
668
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227 return query["hub.challenge"]; |
322
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mod_pubsub_feed: Implement PubSubHubbub subscriber
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228 end |
668
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229 return 400; |
322
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230 elseif method == "POST" then |
718
a37e4149ccd1
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parents:
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changeset
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231 if #body > 0 then |
322
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232 module:log("debug", "got %d bytes PuSHed for %s", #body, query.node); |
668
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parents:
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diff
changeset
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233 local signature = request.headers.x_hub_signature; |
325
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mod_pubsub_feed: Implement signature verification
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324
diff
changeset
|
234 if feed.secret then |
4e50e591a7fc
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235 local localsig = "sha1=" .. hmac_sha1(feed.secret, body, true); |
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diff
changeset
|
236 if localsig ~= signature then |
668
343b115ebbea
mod_pubsub_feed: Cleanup and update to new APIs in 0.9
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parents:
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diff
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|
237 module:log("debug", "Invalid signature, got %s but wanted %s", tostring(signature), tostring(localsig)); |
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238 return 401; |
325
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diff
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239 end |
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240 module:log("debug", "Valid signature"); |
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parents:
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diff
changeset
|
241 end |
322
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242 feed.data = body; |
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diff
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|
243 update_entry(feed); |
637dc0a04052
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diff
changeset
|
244 feed.last_update = time(); |
668
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245 return 202; |
322
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diff
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|
246 end |
668
343b115ebbea
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parents:
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diff
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|
247 return 400; |
322
637dc0a04052
mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents:
300
diff
changeset
|
248 end |
668
343b115ebbea
mod_pubsub_feed: Cleanup and update to new APIs in 0.9
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parents:
633
diff
changeset
|
249 return 501; |
322
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parents:
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diff
changeset
|
250 end |
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mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents:
300
diff
changeset
|
251 |
668
343b115ebbea
mod_pubsub_feed: Cleanup and update to new APIs in 0.9
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parents:
633
diff
changeset
|
252 if use_pubsubhubub then |
343b115ebbea
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parents:
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diff
changeset
|
253 module:provides("http", { |
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parents:
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diff
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|
254 default_path = "/callback"; |
343b115ebbea
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diff
changeset
|
255 route = { |
343b115ebbea
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parents:
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diff
changeset
|
256 GET = handle_http_request; |
343b115ebbea
mod_pubsub_feed: Cleanup and update to new APIs in 0.9
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parents:
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diff
changeset
|
257 POST = handle_http_request; |
343b115ebbea
mod_pubsub_feed: Cleanup and update to new APIs in 0.9
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parents:
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diff
changeset
|
258 -- This all? |
343b115ebbea
mod_pubsub_feed: Cleanup and update to new APIs in 0.9
Kim Alvefur <zash@zash.se>
parents:
633
diff
changeset
|
259 }; |
343b115ebbea
mod_pubsub_feed: Cleanup and update to new APIs in 0.9
Kim Alvefur <zash@zash.se>
parents:
633
diff
changeset
|
260 }); |
278
653c1826739e
mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
261 end |
653c1826739e
mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
262 |
668
343b115ebbea
mod_pubsub_feed: Cleanup and update to new APIs in 0.9
Kim Alvefur <zash@zash.se>
parents:
633
diff
changeset
|
263 module:add_timer(1, refresh_feeds); |