prosody-modules
bbea8081c865
mod_pubsub_feed/mod_pubsub_feed.lua

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mod_pubsub_feed/mod_pubsub_feed.lua @ 461:bbea8081c865

Revert various changes accidentally included in previous commit
author Kim Alvefur <zash@zash.se>
date Sat, 29 Oct 2011 13:34:15 +0200
parent 455:52f2188ec47d
child 475:db5702bb9e41
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 uuid = require "util.uuid".generate;
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30 local hmac_sha1 = require "util.hmac".sha1;
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31 local parse_feed = require "feeds".feed_from_string;
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32 local st = require "util.stanza";
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33
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34 local http = require "net.http";
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35 local httpserver = require "net.httpserver";
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36 local formdecode = http.formdecode;
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37 local formencode = http.formencode;
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38 local urldecode = http.urldecode;
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39 local urlencode = http.urlencode;
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40
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41 local config = module:get_option("feeds") or {
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42 planet_jabber = "http://planet.jabber.org/atom.xml";
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43 prosody_blog = "http://blog.prosody.im/feed/atom.xml";
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44 };
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45 local refresh_interval = module:get_option_number("feed_pull_interval", 15) * 60;
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46 local use_pubsubhubub = module:get_option_boolean("use_pubsubhubub", true); -- HTTP by default or not?
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47 local httphost = module:get_option_string("pubsubhubub_httphost", module.host); -- If module.host IN A doesn't point to this server, use this to override.
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48 local feed_list = { }
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49 for node, url in pairs(config) do
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50 feed_list[node] = { url = url; node = node; last_update = 0 };
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51 end
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52 -- TODO module:hook("config-reloaded", above loop);
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53 -- Also, keeping it somewhere persistent in order to avoid duplicated publishes?
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54
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55 -- Used to kill the timer
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56 local module_unloaded = false;
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57 function module.unload()
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58 module_unloaded = true;
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59 end
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60
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61 -- Thanks to Maranda for this
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62 local port, base, ssl = 5280, "callback", false;
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63 local ports = module:get_option("feeds_ports") or { port = port, base = base, ssl = ssl };
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64 -- FIXME If ports isn't a table, this will cause an error
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65 local _, first_port = next(ports); -- We base the callback URL on the first port config
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66 if first_port then
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67 if type(first_port) == "number" then
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68 port = first_port;
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69 elseif type(first_port) == "table" then
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70 port, base, ssl =
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71 first_port.port or port,
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72 first_port.path or base,
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73 first_port.ssl or ssl;
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74 elseif type(first_port) == "string" then
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75 base = first_port;
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76 end
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77 end
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78
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79 local response_codes = {
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80 ["200"] = "OK";
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81 ["202"] = "Accepted";
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82 ["400"] = "Bad Request";
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83 ["403"] = "Forbidden";
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84 ["404"] = "Not Found";
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85 ["500"] = "Internal Server Error";
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86 ["501"] = "Not Implemented";
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87 };
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88
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89 local function http_response(code, headers, body)
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90 return {
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91 status = (type(code) == "number" and code .. " " .. response_codes[tostring(code)]) or code;
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92 headers = headers or {};
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93 body = body or "<h1>" .. response_codes[tostring(code)] .. "</h1>\n";
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94 };
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95 end
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96
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97 local actor = module.host.."/"..module.name;
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98
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99 function update_entry(item)
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100 local node = item.node;
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101 --module:log("debug", "parsing %d bytes of data in node %s", #item.data or 0, node)
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102 local feed = parse_feed(item.data);
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103 module:log("debug", "updating node %s", node);
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104 for _, entry in ipairs(feed) do
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105 entry.attr.xmlns = "http://www.w3.org/2005/Atom";
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106
403
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107 local e_published = entry:get_child_text("published");
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108 e_published = e_published and dt_parse(e_published);
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109 local e_updated = entry:get_child_text("updated");
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110 e_updated = e_updated and dt_parse(e_updated);
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111
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112 local timestamp = e_updated or e_published or nil;
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113 --module:log("debug", "timestamp is %s, item.last_update is %s", tostring(timestamp), tostring(item.last_update));
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114 if not timestamp or not item.last_update or timestamp > item.last_update then
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115 local id = entry:get_child_text("id");
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116 id = id or item.url.."#"..dt_datetime(timestamp); -- Missing id, so make one up
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117 local xitem = st.stanza("item", { id = id }):add_child(entry);
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118 -- TODO Put data from /feed into item/source
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119
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120 module:log("debug", "publishing to %s, id %s", node, id);
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121 local ok, err = modules.pubsub.service:publish(node, actor, id, xitem);
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122 if not ok then
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123 if err == "item-not-found" then -- try again
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124 module:log("debug", "got item-not-found, creating %s and trying again", node);
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diff changeset
125 local ok, err = modules.pubsub.service:create(node, actor);
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diff changeset
126 if not ok then
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diff changeset
127 module:log("error", "could not create node %s: %s", node, err);
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parents: 300
diff changeset
128 return;
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parents: 300
diff changeset
129 end
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diff changeset
130 local ok, err = modules.pubsub.service:publish(node, actor, id, xitem);
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diff changeset
131 if not ok then
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parents: 300
diff changeset
132 module:log("error", "could not create or publish node %s: %s", node, err);
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parents: 300
diff changeset
133 return
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parents: 300
diff changeset
134 end
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parents: 300
diff changeset
135 else
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parents: 300
diff changeset
136 module:log("error", "publishing %s failed: %s", node, err);
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parents: 300
diff changeset
137 end
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
138 end
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
139 end
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
140 end
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
141
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diff changeset
142 if use_pubsubhubub and not item.subscription then
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143 module:log("debug", "check if %s has a hub", item.node);
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144 local hub = feed.links and feed.links.hub;
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145 if hub then
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146 item.hub = hub;
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147 module:log("debug", "%s has a hub: %s", item.node, item.hub);
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148 subscribe(item);
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149 end
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parents: 300
diff changeset
150 end
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parents: 300
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151 end
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diff changeset
152
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diff changeset
153 function fetch(item, callback) -- HTTP Pull
278
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parents:
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154 local headers = { };
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155 if item.data and item.last_update then
400
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diff changeset
156 headers["If-Modified-Since"] = date("!%a, %d %b %Y %H:%M:%S %Z", item.last_update);
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diff changeset
157 --COMPAT We could have saved 6 bytes here, but Microsoft apparently hates %T, so you got this gigantic comment instead.
278
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parents:
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158 end
322
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159 http.request(item.url, { headers = headers }, function(data, code, req)
278
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parents:
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160 if code == 200 then
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parents:
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161 item.data = data;
322
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162 if callback then callback(item) end
278
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parents:
diff changeset
163 item.last_update = time();
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parents:
diff changeset
164 end
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parents:
diff changeset
165 if code == 304 then
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parents:
diff changeset
166 item.last_update = time();
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parents:
diff changeset
167 end
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parents:
diff changeset
168 end);
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parents:
diff changeset
169 end
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parents:
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170
322
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diff changeset
171 function refresh_feeds()
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diff changeset
172 if module_unloaded then return end
322
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diff changeset
173 --module:log("debug", "Refreshing feeds");
278
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parents:
diff changeset
174 for node, item in pairs(feed_list) do
322
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diff changeset
175 --FIXME Don't fetch feeds which have a subscription
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diff changeset
176 -- Otoho, what if the subscription expires or breaks?
461
bbea8081c865 Revert various changes accidentally included in previous commit
Kim Alvefur <zash@zash.se>
parents: 455
diff changeset
177 if item.last_update + refresh_interval < time() then
322
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diff changeset
178 module:log("debug", "checking %s", item.node);
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diff changeset
179 fetch(item, update_entry);
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180 end
278
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parents:
diff changeset
181 end
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parents:
diff changeset
182 return refresh_interval;
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parents:
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183 end
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parents:
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184
401
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diff changeset
185 local function format_url(secure, host, port, path, node)
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186 return ("%s://%s:%d/%s?node=%s"):format(secure and "https" or "http", host, port, path, urlencode(node));
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187 end
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188
323
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diff changeset
189 function subscribe(feed)
324
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diff changeset
190 feed.token = uuid();
325
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diff changeset
191 feed.secret = uuid();
403
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parents: 402
diff changeset
192 local body = formencode{
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diff changeset
193 ["hub.callback"] = format_url(ssl, httphost, port, base, feed.node);
322
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194 ["hub.mode"] = "subscribe"; --TODO unsubscribe
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195 ["hub.topic"] = feed.url;
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196 ["hub.verify"] = "async";
324
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diff changeset
197 ["hub.verify_token"] = feed.token;
325
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diff changeset
198 ["hub.secret"] = feed.secret;
322
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diff changeset
199 --["hub.lease_seconds"] = "";
403
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parents: 402
diff changeset
200 };
322
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parents: 300
diff changeset
201
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diff changeset
202 --module:log("debug", "subscription request, body: %s", body);
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parents: 300
diff changeset
203
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parents: 300
diff changeset
204 --FIXME The subscription states and related stuff
323
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parents: 322
diff changeset
205 feed.subscription = "subscribe";
322
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parents: 300
diff changeset
206 http.request(feed.hub, { body = body }, function(data, code, req)
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parents: 300
diff changeset
207 local code = tostring(code);
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parents: 300
diff changeset
208 module:log("debug", "subscription to %s submitted, staus %s", feed.node, code);
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parents: 300
diff changeset
209 end);
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parents: 300
diff changeset
210 end
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parents: 300
diff changeset
211
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parents: 300
diff changeset
212 function handle_http_request(method, body, request)
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parents: 403
diff changeset
213 if module_unloaded then
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parents: 403
diff changeset
214 module:log("warn", "Received a HTTP request after module unload");
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parents: 403
diff changeset
215 return http_response(500)
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parents: 403
diff changeset
216 -- FIXME if this happens.
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parents: 403
diff changeset
217 end
322
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parents: 300
diff changeset
218 --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");
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parents: 401
diff changeset
219 local query = request.url.query or {};
322
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parents: 300
diff changeset
220 if query and type(query) == "string" then
403
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parents: 402
diff changeset
221 query = formdecode(query);
322
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parents: 300
diff changeset
222 --module:log("debug", "GET data: %s", dump(query));
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parents: 300
diff changeset
223 end
325
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parents: 324
diff changeset
224 --module:log("debug", "Headers: %s", dump(request.headers));
322
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parents: 300
diff changeset
225
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parents: 300
diff changeset
226 if method == "GET" then
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parents: 300
diff changeset
227 if query.node and feed_list[query.node] then
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parents: 300
diff changeset
228 local feed = feed_list[query.node];
323
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parents: 322
diff changeset
229 if query["hub.topic"] ~= feed.url then
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parents: 322
diff changeset
230 module:log("debug", "Invalid topic: %s", tostring(query["hub.topic"]))
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parents: 322
diff changeset
231 return http_response(404)
322
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parents: 300
diff changeset
232 end
323
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parents: 322
diff changeset
233 if query["hub.mode"] ~= feed.subscription then
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parents: 322
diff changeset
234 module:log("debug", "Invalid mode: %s", tostring(query["hub.mode"]))
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parents: 322
diff changeset
235 return http_response(400)
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parents: 322
diff changeset
236 -- 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
237 -- 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
238 -- it would probably invalidate the subscription
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Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
239 -- when/if the hub asks if it should be renewed
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Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
240 end
324
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parents: 323
diff changeset
241 if query["hub.verify_token"] ~= feed.token then
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parents: 323
diff changeset
242 module:log("debug", "Invalid verify_token: %s", tostring(query["hub.verify_token"]))
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parents: 323
diff changeset
243 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
244 end
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parents: 322
diff changeset
245 module:log("debug", "Confirming %s request to %s", feed.subscription, feed.url)
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Kim Alvefur <zash@zash.se>
parents: 322
diff changeset
246 return http_response(200, nil, query["hub.challenge"])
322
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parents: 300
diff changeset
247 end
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
248 return http_response(400);
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Kim Alvefur <zash@zash.se>
parents: 300
diff changeset
249 elseif method == "POST" then
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
250 if #body > 0 and feed_list[query.node] then
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parents: 300
diff changeset
251 module:log("debug", "got %d bytes PuSHed for %s", #body, query.node);
637dc0a04052 mod_pubsub_feed: Implement PubSubHubbub subscriber
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parents: 300
diff changeset
252 local feed = feed_list[query.node];
325
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253 local signature = request.headers["x-hub-signature"];
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254 if feed.secret then
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255 local localsig = "sha1=" .. hmac_sha1(feed.secret, body, true);
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256 if localsig ~= signature then
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257 module:log("debug", "Invalid signature");
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258 return http_response(403);
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259 end
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260 module:log("debug", "Valid signature");
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261 end
322
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262 feed.data = body;
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263 update_entry(feed);
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264 feed.last_update = time();
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265 return http_response(202);
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266 end
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267 return http_response(400);
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parents: 300
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268 end
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parents: 300
diff changeset
269 return http_response(501);
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parents: 300
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270 end
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diff changeset
271
278
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
272 function init()
322
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273 module:log("debug", "initiating", module.name);
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parents: 300
diff changeset
274 if use_pubsubhubub then
403
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parents: 402
diff changeset
275 module:log("debug", "Starting http server on %s", format_url(ssl, httphost, port, base, "NODE"));
402
c92a37a72b25 mod_pubsub_feed: Use httpserver.new_from_config(). Fixes SSL. And fix traceback when called without a querypart.
Kim Alvefur <zash@zash.se>
parents: 401
diff changeset
276 httpserver.new_from_config( ports, handle_http_request, { base = "callback" } );
322
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parents: 300
diff changeset
277 end
278
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parents:
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278 add_task(0, refresh_feeds);
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parents:
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279 end
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parents:
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280
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parents:
diff changeset
281 if prosody.start_time then -- already started
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parents:
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282 init();
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
283 else
403
fc62b26dfdf6 mod_pubsub_feed: Major cleanup, and use newer APIs. (Thanks Maranda)
Kim Alvefur <zash@zash.se>
parents: 402
diff changeset
284 module:hook_global("server-started", init);
278
653c1826739e mod_pubsub_feed: Fetches Atom feeds and publishes to PubSub
Kim Alvefur <zash@zash.se>
parents:
diff changeset
285 end