Mercurial > prosody-modules

annotate mod_pubsub_post/mod_pubsub_post.lua @ 5149:fa56ed2bacab

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mod_unified_push: Add support for multiple token backends, including stoage Now that we have ACLs by default, it is no longer necessary to be completely stateless. On 0.12, using storage has benefits over JWT, because it does not expose client JIDs to the push apps/services. In trunk, PASETO is stateless and does not expose client JIDs.
author Matthew Wild <mwild1@gmail.com>
date Sat, 14 Jan 2023 14:31:37 +0000
parents c87181a98f29
children
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rev   line source
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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
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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
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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
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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
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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
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158 if content_type == "application/xml" or content_type:sub(-4) == "+xml" then
3017
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parents: 3016
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159 return handle_xml(path, actor, request.body);
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parents: 3015
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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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parents: 4522
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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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parents:
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168 end
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parents:
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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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parents:
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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