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mod_pubsub_post/mod_pubsub_post.lua @ 3513:9556e92b2ec4
mod_pubsub_github: Abort on unknown github events
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 31 Mar 2019 17:47:45 +0200 |
parent | 3504:9ef5b229f73e |
child | 3793:0d3926e49b55 |
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 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, data.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 |