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annotate mod_pubsub_post/mod_pubsub_post.lua @ 4874:b7222636bf26

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mod_pubsub_summary: Add stub documentation
author Kim Alvefur <zash@zash.se>
date Tue, 18 Jan 2022 09:34:10 +0100
parents c87181a98f29
children
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43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
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1 module:depends("http");
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2
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3 local st = require "util.stanza";
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4 local json = require "util.json";
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5 local xml = require "util.xml";
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6 local http = require "net.http";
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7 local uuid_generate = require "util.uuid".generate;
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8 local timestamp_generate = require "util.datetime".datetime;
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9 local hashes = require "util.hashes";
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10 local from_hex = require "util.hex".from;
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11 local hmacs = {
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12 sha1 = hashes.hmac_sha1;
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13 sha256 = hashes.hmac_sha256;
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14 sha384 = hashes.hmac_sha384;
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15 sha512 = hashes.hmac_sha512;
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16 };
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17
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18 local pubsub_service = module:depends("pubsub").service;
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19
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20 local mappings = module:get_option("pubsub_post_mappings", nil);
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21 local datamapper;
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22 if type(mappings) == "table" then
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23 datamapper = require "util.datamapper";
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24 for node, f in pairs(mappings) do
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25 if type(f) == "string" then
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26 local fh = assert(module:load_resource(f));
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27 mappings[node] = assert(json.parse(fh:read("*a")));
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28 fh:close()
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29 end
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30 end
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31 end
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32
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33 local function wrap(node, parsed, raw)
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34 if mappings and mappings[node] then
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35 return datamapper.unparse(mappings[node], parsed)
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36 end
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37 return st.stanza("json", { xmlns="urn:xmpp:json:0" }):text(raw);
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38 end
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39
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40 local error_mapping = {
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41 ["forbidden"] = 403;
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42 ["item-not-found"] = 404;
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43 ["internal-server-error"] = 500;
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44 ["conflict"] = 409;
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45 };
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46
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47 local function publish_payload(node, actor, item_id, payload)
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48 local post_item = st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = item_id, })
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49 :add_child(payload);
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50 local ok, err = pubsub_service:publish(node, actor, item_id, post_item);
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51 module:log("debug", ":publish(%q, true, %q, %s) -> %q", node, item_id, payload:top_tag(), err or "");
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52 if not ok then
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53 return error_mapping[err] or 500;
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54 end
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55 return 202;
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56 end
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57
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58 local function handle_json(node, actor, data)
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59 local parsed, err = json.decode(data);
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60 if not parsed then
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61 return { status_code = 400; body = tostring(err); }
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62 end
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63 if type(parsed) ~= "table" then
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64 return { status_code = 400; body = "object or array expected"; };
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65 end
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66 local payload = wrap(node, parsed, data)
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67 local item_id = "current";
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68 if payload.attr["http://jabber.org/protocol/pubsub\1id"] then
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69 item_id = payload.attr["http://jabber.org/protocol/pubsub\1id"];
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70 payload.attr["http://jabber.org/protocol/pubsub\1id"] = nil;
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71 elseif type(parsed.id) == "string" then
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72 item_id = parsed.id;
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73 end
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74 return publish_payload(node, actor, item_id, payload);
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75 end
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76
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77 local function publish_atom(node, actor, feed)
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78 for entry in feed:childtags("entry") do
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79 local item_id = entry:get_child_text("id");
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80 if not item_id then
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81 item_id = uuid_generate();
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82 entry:tag("id"):text(item_id):up();
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83 end
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84 if not entry:get_child_text("published") then
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85 entry:tag("published"):text(timestamp_generate()):up();
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86 end
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87 local resp = publish_payload(node, actor, item_id, entry);
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88 if resp ~= 202 then return resp; end
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89 end
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90 return 202;
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91 end
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92
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93 local function handle_xml(node, actor, payload)
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94 local xmlpayload, err = xml.parse(payload);
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95 if not xmlpayload then
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96 module:log("debug", "XML parse error: %s\n%q", err, payload);
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97 return { status_code = 400, body = tostring(err) };
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98 end
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99 if xmlpayload.attr.xmlns == "http://www.w3.org/2005/Atom" and xmlpayload.name == "feed" then
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100 return publish_atom(node, actor, xmlpayload);
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101 else
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102 return publish_payload(node, actor, "current", xmlpayload);
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103 end
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104 end
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105
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106 local function handle_urlencoded(node, actor, data)
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107 local parsed = http.formdecode(data);
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108 if type(parsed) ~= "table" then return {status_code = 400; body = "invalid payload"}; end
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109 for i = 1, #parsed do parsed[i] = nil; end
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110
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111 local payload = wrap(node, parsed, json.encode(parsed));
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112 local item_id = "current";
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113 if payload.attr["http://jabber.org/protocol/pubsub\1id"] then
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114 item_id = payload.attr["http://jabber.org/protocol/pubsub\1id"];
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115 payload.attr["http://jabber.org/protocol/pubsub\1id"] = nil;
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116 elseif type(parsed.id) == "string" then
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117 item_id = parsed.id;
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118 end
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119 return publish_payload(node, actor, item_id, payload);
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120 end
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121
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122 local actor_source = module:get_option_string("pubsub_post_actor"); -- COMPAT
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123 local default_secret = module:get_option_string("pubsub_post_default_secret");
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124 local actor_secrets = module:get_option("pubsub_post_secrets");
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125 local actors = module:get_option("pubsub_post_actors");
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126 local default_actor = module:get_option_string("pubsub_post_default_actor");
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127 if not default_actor and actor_source == "superuser" then
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128 default_actor = true;
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129 end
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130
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131 local function verify_signature(secret, body, signature)
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132 if not signature then return false; end
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133 local algo, digest = signature:match("^([^=]+)=(%x+)");
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134 if not algo then return false; end
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135 local hmac = hmacs[algo];
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136 if not algo then return false; end
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137 return hmac(secret, body) == from_hex(digest);
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138 end
3018
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139
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140 function handle_POST(event, path)
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141 local request = event.request;
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142
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143 local content_type = request.headers.content_type or "application/octet-stream";
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144 local actor = actors and actors[path] or default_actor or request.ip;
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145 local secret = actor_secrets and actor_secrets[path] or default_secret;
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146
3504
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147 module:log("debug", "Handling POST to node %q by %q with %q: \n%s\n", path, actor, content_type, request.body);
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148
3501
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149 if secret and not verify_signature(secret, request.body, request.headers.x_hub_signature) then
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150 module:log("debug", "Signature validation failed");
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151 return 401;
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152 end
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153
3255
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154 if not actor then
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155 return 401;
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156 end
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157
3014
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158 if content_type == "application/xml" or content_type:sub(-4) == "+xml" then
3017
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159 return handle_xml(path, actor, request.body);
3016
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160 elseif content_type == "application/json" or content_type:sub(-5) == "+json" then
3017
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161 return handle_json(path, actor, request.body);
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162 elseif content_type == "application/x-www-form-urlencoded" then
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163 return handle_urlencoded(path, actor, request.body);
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164 end
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165
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166 module:log("debug", "Unsupported content-type: %q", content_type);
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167 return 415;
1619
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168 end
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169
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170 module:provides("http", {
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171 route = {
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172 ["POST /*"] = handle_POST;
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173 };
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174 });
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parents:
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175
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176 function module.load()
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177 module:log("debug", "Loaded at %s", module:http_url());
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178 end