Mercurial > prosody-modules

annotate mod_pubsub_post/mod_pubsub_post.lua @ 4303:d261233f7ced

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Improve UX by providing defaults users expect
author Seve Ferrer <seve@delape.net>
date Fri, 18 Dec 2020 15:28:12 +0100
parents 0d3926e49b55
children f7381268a597
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
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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 uuid_generate = require "util.uuid".generate;
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7 local timestamp_generate = require "util.datetime".datetime;
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8 local hashes = require "util.hashes";
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9 local from_hex = require "util.hex".from;
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10 local hmacs = {
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11 sha1 = hashes.hmac_sha1;
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12 sha256 = hashes.hmac_sha256;
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13 sha384 = hashes.hmac_sha384;
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14 sha512 = hashes.hmac_sha512;
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15 };
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16
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17 local pubsub_service = module:depends("pubsub").service;
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18
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19 local error_mapping = {
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20 ["forbidden"] = 403;
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21 ["item-not-found"] = 404;
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22 ["internal-server-error"] = 500;
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23 ["conflict"] = 409;
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24 };
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25
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26 local function publish_payload(node, actor, item_id, payload)
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27 local post_item = st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = item_id, })
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28 :add_child(payload);
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29 local ok, err = pubsub_service:publish(node, actor, item_id, post_item);
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30 module:log("debug", ":publish(%q, true, %q, %s) -> %q", node, item_id, payload:top_tag(), err or "");
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31 if not ok then
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32 return error_mapping[err] or 500;
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33 end
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34 return 202;
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35 end
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36
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37 local function handle_json(node, actor, data)
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38 local parsed, err = json.decode(data);
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39 if not parsed then
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40 return { status_code = 400; body = tostring(err); }
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41 end
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42 if type(parsed) ~= "table" then
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43 return { status_code = 400; body = "object or array expected"; };
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44 end
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45 local wrapper = st.stanza("json", { xmlns="urn:xmpp:json:0" }):text(data);
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46 return publish_payload(node, actor, type(parsed.id) == "string" and parsed.id or "current", wrapper);
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47 end
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48
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49 local function publish_atom(node, actor, feed)
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50 for entry in feed:childtags("entry") do
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51 local item_id = entry:get_child_text("id");
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52 if not item_id then
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53 item_id = uuid_generate();
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54 entry:tag("id"):text(item_id):up();
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55 end
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56 if not entry:get_child_text("published") then
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57 entry:tag("published"):text(timestamp_generate()):up();
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58 end
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59 local resp = publish_payload(node, actor, item_id, entry);
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60 if resp ~= 202 then return resp; end
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61 end
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62 return 202;
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63 end
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64
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65 local function handle_xml(node, actor, payload)
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66 local xmlpayload, err = xml.parse(payload);
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67 if not xmlpayload then
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68 module:log("debug", "XML parse error: %s\n%q", err, payload);
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69 return { status_code = 400, body = tostring(err) };
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70 end
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71 if xmlpayload.attr.xmlns == "http://www.w3.org/2005/Atom" and xmlpayload.name == "feed" then
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72 return publish_atom(node, actor, xmlpayload);
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73 else
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74 return publish_payload(node, actor, "current", xmlpayload);
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75 end
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76 end
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77
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78 local actor_source = module:get_option_string("pubsub_post_actor"); -- COMPAT
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79 local default_secret = module:get_option_string("pubsub_post_default_secret");
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80 local actor_secrets = module:get_option("pubsub_post_secrets");
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81 local actors = module:get_option("pubsub_post_actors");
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82 local default_actor = module:get_option_string("pubsub_post_default_actor");
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83 if not default_actor and actor_source == "superuser" then
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84 default_actor = true;
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85 end
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86
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87 local function verify_signature(secret, body, signature)
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88 if not signature then return false; end
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89 local algo, digest = signature:match("^([^=]+)=(%x+)");
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90 if not algo then return false; end
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91 local hmac = hmacs[algo];
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92 if not algo then return false; end
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93 return hmac(secret, body) == from_hex(digest);
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94 end
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95
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96 function handle_POST(event, path)
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97 local request = event.request;
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98
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99 local content_type = request.headers.content_type or "application/octet-stream";
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100 local actor = actors and actors[path] or default_actor or request.ip;
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101 local secret = actor_secrets and actor_secrets[path] or default_secret;
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102
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103 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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104
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105 if secret and not verify_signature(secret, request.body, request.headers.x_hub_signature) then
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106 module:log("debug", "Signature validation failed");
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107 return 401;
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108 end
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109
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110 if not actor then
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111 return 401;
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112 end
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113
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114 if content_type == "application/xml" or content_type:sub(-4) == "+xml" then
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115 return handle_xml(path, actor, request.body);
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116 elseif content_type == "application/json" or content_type:sub(-5) == "+json" then
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117 return handle_json(path, actor, request.body);
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118 end
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119
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120 module:log("debug", "Unsupported content-type: %q", content_type);
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121 return 415;
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122 end
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123
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124 module:provides("http", {
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125 route = {
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126 ["POST /*"] = handle_POST;
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127 };
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128 });
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129
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130 function module.load()
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131 module:log("debug", "Loaded at %s", module:http_url());
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132 end