prosody-modules
4e50e591a7fc
mod_pubsub_feed/mod_pubsub_feed.lua

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mod_pubsub_feed/mod_pubsub_feed.lua @ 325:4e50e591a7fc

mod_pubsub_feed: Implement signature verification
author Kim Alvefur <zash@zash.se>
date Tue, 01 Feb 2011 00:24:19 +0100
parent 324:100b3ad2e10c
child 400:f42fe4229f8a
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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_feed";
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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 then
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20 --FIXME Should this throw an error() instead?
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21 module:log("warn", "Pubsub needs to be loaded on this host");
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22 end
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23
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24
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25 local t_insert = table.insert;
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26 local add_task = require "util.timer".add_task;
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27 local date, time = os.date, os.time;
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28 local dt_parse, dt_datetime = require "util.datetime".parse, require "util.datetime".datetime;
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29 local http = require "net.http";
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30 local parse_feed = require "feeds".feed_from_string;
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31 local st = require "util.stanza";
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32 local httpserver = require "net.httpserver";
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33 local formencode = require "net.http".formencode;
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34 local dump = require "util.serialization".serialize;
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35 local uuid = require "util.uuid".generate;
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36 local hmac_sha1 = require "util.hmac".sha1;
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37
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38 local urldecode = require "net.http".urldecode;
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39 local urlencode = require "net.http".urlencode;
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40 local urlparams = --require "net.http".getQueryParams or whatever MattJ names it, FIXME
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41 function(s)
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42 if not s:match("=") then return urldecode(s); end
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43 local r = {}
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44 s:gsub("([^=&]*)=([^&]*)", function(k,v)
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45 r[ urldecode(k) ] = urldecode(v);
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46 return nil
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47 end)
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48 return r
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49 end;
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50
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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 local refresh_interval = module:get_option_number("feed_pull_interval", 15) * 60;
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56 local use_pubsubhubub = module:get_option_boolean("use_pubsubhubub", true); -- HTTP by default or not?
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57 local feed_list = { }
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58 for node, url in pairs(config) do
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59 feed_list[node] = { url = url; node = node; last_update = 0 };
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60 end
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61
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62 local response_codes = {
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63 ["200"] = "OK";
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64 ["202"] = "Accepted";
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65 ["400"] = "Bad Request";
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66 ["403"] = "Forbidden";
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67 ["404"] = "Not Found";
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68 ["501"] = "Not Implemented";
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69 };
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70
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71 local function http_response(code, headers, body)
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72 return {
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73 status = (type(code) == "number" and code .. " " .. response_codes[tostring(code)]) or code;
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74 headers = headers or {};
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75 body = body or "<h1>" .. response_codes[tostring(code)] .. "</h1>\n";
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76 };
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77 end
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78
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79 local actor = module.host.."/"..module.name;
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80
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81 function update_entry(item)
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82 local node = item.node;
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83 --module:log("debug", "parsing %d bytes of data in node %s", #item.data or 0, node)
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84 local feed = parse_feed(item.data);
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85 module:log("debug", "updating node %s", node);
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86 for _, entry in ipairs(feed) do
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87 entry.attr.xmlns = "http://www.w3.org/2005/Atom";
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88
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89 local e_published = entry:get_child("published");
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90 e_published = e_published and e_published:get_text();
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91 e_published = e_published and dt_parse(e_published);
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92 local e_updated = entry:get_child("updated");
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93 e_updated = e_updated and e_updated:get_text();
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94 e_updated = e_updated and dt_parse(e_updated);
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95
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96 local timestamp = e_updated or e_published or nil;
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97 --module:log("debug", "timestamp is %s, item.last_update is %s", tostring(timestamp), tostring(item.last_update));
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98 if not timestamp or not item.last_update or timestamp > item.last_update then
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99 local id = entry:get_child("id");
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100 id = id and id:get_text() or item.url.."#"..dt_datetime(timestamp); -- Missing id, so make one up
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101 local xitem = st.stanza("item", { id = id }):add_child(entry);
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102 -- TODO Put data from /feed into item/source
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103
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104 module:log("debug", "publishing to %s, id %s", node, id);
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105 local ok, err = modules.pubsub.service:publish(node, actor, id, xitem);
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106 if not ok then
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107 if err == "item-not-found" then -- try again
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108 module:log("debug", "got item-not-found, creating %s and trying again", node);
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109 local ok, err = modules.pubsub.service:create(node, actor);
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110 if not ok then
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111 module:log("error", "could not create node %s: %s", node, err);
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112 return;
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113 end
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114 local ok, err = modules.pubsub.service:publish(node, actor, id, xitem);
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115 if not ok then
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116 module:log("error", "could not create or publish node %s: %s", node, err);
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117 return
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118 end
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119 else
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120 module:log("error", "publishing %s failed: %s", node, err);
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121 end
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122 end
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123 end
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124 end
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125
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126 if use_pubsubhubub and not item.subscription then
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127 module:log("debug", "check if %s has a hub", item.node);
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diff changeset
128 local hub = feed.links and feed.links.hub;
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diff changeset
129 if hub then
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diff changeset
130 item.hub = hub;
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diff changeset
131 module:log("debug", "%s has a hub: %s", item.node, item.hub);
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diff changeset
132 subscribe(item);
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parents: 300
diff changeset
133 end
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
134 end
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
135 end
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
136
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diff changeset
137 function fetch(item, callback) -- HTTP Pull
278
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parents:
diff changeset
138 local headers = { };
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diff changeset
139 if item.data and item.last_update then
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parents:
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140 headers["If-Modified-Since"] = date("!%a, %d %b %Y %T %Z", item.last_update);
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parents:
diff changeset
141 end
322
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diff changeset
142 http.request(item.url, { headers = headers }, function(data, code, req)
278
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parents:
diff changeset
143 if code == 200 then
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parents:
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144 item.data = data;
322
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diff changeset
145 if callback then callback(item) end
278
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diff changeset
146 item.last_update = time();
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parents:
diff changeset
147 end
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parents:
diff changeset
148 if code == 304 then
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diff changeset
149 item.last_update = time();
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parents:
diff changeset
150 end
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
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parents:
diff changeset
151 end);
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parents:
diff changeset
152 end
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153
322
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diff changeset
154 function refresh_feeds()
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155 --module:log("debug", "Refreshing feeds");
278
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parents:
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156 for node, item in pairs(feed_list) do
322
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diff changeset
157 --FIXME Don't fetch feeds which have a subscription
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diff changeset
158 -- Otoho, what if the subscription expires or breaks?
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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diff changeset
159 if item.last_update + refresh_interval < time() then
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diff changeset
160 module:log("debug", "checking %s", item.node);
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diff changeset
161 fetch(item, update_entry);
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diff changeset
162 end
278
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parents:
diff changeset
163 end
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164 return refresh_interval;
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
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parents:
diff changeset
165 end
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166
323
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diff changeset
167 function subscribe(feed)
324
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diff changeset
168 feed.token = uuid();
325
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diff changeset
169 feed.secret = uuid();
322
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diff changeset
170 local _body, body = {
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diff changeset
171 ["hub.callback"] = "http://"..module.host..":5280/callback?node=" .. urlencode(feed.node); --FIXME figure out your own hostname reliably?
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diff changeset
172 ["hub.mode"] = "subscribe"; --TODO unsubscribe
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diff changeset
173 ["hub.topic"] = feed.url;
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diff changeset
174 ["hub.verify"] = "async";
324
100b3ad2e10c mod_pubsub_feed: Fix verify_token checking.
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diff changeset
175 ["hub.verify_token"] = feed.token;
325
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diff changeset
176 ["hub.secret"] = feed.secret;
322
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diff changeset
177 --["hub.lease_seconds"] = "";
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diff changeset
178 }, { };
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diff changeset
179 for name, value in pairs(_body) do
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diff changeset
180 t_insert(body, { name = name, value = value });
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diff changeset
181 end --FIXME Why do I have to do this?
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diff changeset
182 body = formencode(body);
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diff changeset
183
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diff changeset
184 --module:log("debug", "subscription request, body: %s", body);
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diff changeset
185
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diff changeset
186 --FIXME The subscription states and related stuff
323
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diff changeset
187 feed.subscription = "subscribe";
322
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diff changeset
188 http.request(feed.hub, { body = body }, function(data, code, req)
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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diff changeset
189 local code = tostring(code);
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diff changeset
190 module:log("debug", "subscription to %s submitted, staus %s", feed.node, code);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
191 end);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
192 end
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
193
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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diff changeset
194 function handle_http_request(method, body, request)
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diff changeset
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");
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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diff changeset
196 local query = request.url.query;
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
197 if query and type(query) == "string" then
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
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diff changeset
198 query = urlparams(query);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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diff changeset
199 --module:log("debug", "GET data: %s", dump(query));
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
200 end
325
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parents: 324
diff changeset
201 --module:log("debug", "Headers: %s", dump(request.headers));
322
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
202
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
203 if method == "GET" then
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
204 if query.node and feed_list[query.node] then
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
205 local feed = feed_list[query.node];
323
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
206 if query["hub.topic"] ~= feed.url then
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
207 module:log("debug", "Invalid topic: %s", tostring(query["hub.topic"]))
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
208 return http_response(404)
322
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
209 end
323
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
210 if query["hub.mode"] ~= feed.subscription then
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
211 module:log("debug", "Invalid mode: %s", tostring(query["hub.mode"]))
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
212 return http_response(400)
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
213 -- Would this work for unsubscribe?
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
214 -- Also, if feed.subscription is changed here,
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
215 -- it would probably invalidate the subscription
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
216 -- when/if the hub asks if it should be renewed
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
217 end
324
100b3ad2e10c mod_pubsub_feed: Fix verify_token checking.
Kim Alvefur <zash@zash.se>
parents: 323
diff changeset
218 if query["hub.verify_token"] ~= feed.token then
100b3ad2e10c mod_pubsub_feed: Fix verify_token checking.
Kim Alvefur <zash@zash.se>
parents: 323
diff changeset
219 module:log("debug", "Invalid verify_token: %s", tostring(query["hub.verify_token"]))
100b3ad2e10c mod_pubsub_feed: Fix verify_token checking.
Kim Alvefur <zash@zash.se>
parents: 323
diff changeset
220 return http_response(403)
323
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
221 end
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
222 module:log("debug", "Confirming %s request to %s", feed.subscription, feed.url)
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
223 return http_response(200, nil, query["hub.challenge"])
322
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
224 end
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
225 return http_response(400);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
226 elseif method == "POST" then
323
433bf7dc3e7a mod_pubsub_feed: Stricter verification handling. Correctly echo the hubs challenge.
Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
227 -- TODO http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.3.html#authednotify
322
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
228 if #body > 0 and feed_list[query.node] then
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
229 module:log("debug", "got %d bytes PuSHed for %s", #body, query.node);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
230 local feed = feed_list[query.node];
325
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
231 local signature = request.headers["x-hub-signature"];
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
232 if feed.secret then
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
233 local localsig = "sha1=" .. hmac_sha1(feed.secret, body, true);
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
234 if localsig ~= signature then
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
235 module:log("debug", "Invalid signature");
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
236 return http_response(403);
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
237 end
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
238 module:log("debug", "Valid signature");
4e50e591a7fc mod_pubsub_feed: Implement signature verification
Kim Alvefur <zash@zash.se>
parents: 324
diff changeset
239 end
322
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
240 feed.data = body;
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
241 update_entry(feed);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
242 feed.last_update = time();
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
243 return http_response(202);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
244 end
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
245 return http_response(400);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
246 end
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
247 return http_response(501);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
248 end
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
249
278
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
250 function init()
322
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
251 module:log("debug", "initiating", module.name);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
252 if use_pubsubhubub then
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
253 httpserver.new{ port = 5280, base = "callback", handler = handle_http_request }
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
254 end
278
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
255 add_task(0, refresh_feeds);
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
256 end
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
257
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
258 if prosody.start_time then -- already started
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
259 init();
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
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260 else
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
261 prosody.events.add_handler("server-started", init);
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
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262 end