Mercurial > prosody-modules

annotate mod_pubsub_github/mod_pubsub_github.lua @ 5296:0f5657db1cfc

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mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parents 3bece2db869c
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 hashes = require "util.hashes";
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6 local from_hex = require "util.hex".from;
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7 local hmacs = {
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8 sha1 = hashes.hmac_sha1;
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9 sha256 = hashes.hmac_sha256;
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10 sha384 = hashes.hmac_sha384;
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11 sha512 = hashes.hmac_sha512;
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12 };
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13
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14 local pubsub_service = module:depends("pubsub").service;
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15
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16 -- configuration
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17 local default_node = module:get_option("github_node", "github");
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18 local node_prefix = module:get_option_string("github_node_prefix", "github/");
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19 local node_mapping = module:get_option_string("github_node_mapping");
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20 local github_actor = module:get_option_string("github_actor") or true;
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21 local github_secret = module:get_option("github_secret");
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22
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23 -- validation
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24 assert(github_secret, "Please set 'github_secret'");
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25
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26 local error_mapping = {
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27 ["forbidden"] = 403;
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28 ["item-not-found"] = 404;
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29 ["internal-server-error"] = 500;
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30 ["conflict"] = 409;
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31 };
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32
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33 local function verify_signature(secret, body, signature)
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34 if not signature then return false; end
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35 local algo, digest = signature:match("^([^=]+)=(%x+)");
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36 if not algo then return false; end
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37 local hmac = hmacs[algo];
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38 if not algo then return false; end
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39 return hmac(secret, body) == from_hex(digest);
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40 end
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41
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42 function handle_POST(event)
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43 local request, response = event.request, event.response;
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44
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45 if not verify_signature(github_secret, request.body, request.headers.x_hub_signature) then
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46 module:log("debug", "Signature validation failed");
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47 return 401;
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48 end
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49
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50 local data = json.decode(request.body);
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51 if not data then
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52 response.status_code = 400;
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53 return "Invalid JSON. From you of all people...";
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54 end
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55
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56 local node = default_node;
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57 if node_mapping then
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58 node = node_prefix .. data.repository[node_mapping];
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59 end
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60
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61 local github_event = request.headers.x_github_event or data.object_kind;
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62 if not github_event and data.commits then
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63 github_event = "push"; -- curl?
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64 end
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65 module:log("debug", "Handling '%s' event: \n%s\n", github_event, tostring(request.body));
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66
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67 if github_event == "push" then
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68
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69 for _, commit in ipairs(data.commits) do
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70 local ok, err = pubsub_service:publish(node, github_actor, commit.id,
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71 st.stanza("item", { id = commit.id, xmlns = "http://jabber.org/protocol/pubsub" })
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72 :tag("entry", { xmlns = "http://www.w3.org/2005/Atom" })
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73 :tag("id"):text(commit.id):up()
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74 :tag("title"):text(commit.message:match("^[^\r\n]*")):up()
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75 :tag("summary"):text(("Commit to %s by %s: %s"):format(data.repository.name, commit.author.name, commit.message:match("^[^\r\n]*"))):up()
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76 :tag("content"):text(commit.message):up()
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77 :tag("link", { rel = "alternate", href = commit.url }):up()
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78 :tag("published"):text(commit.author.date):up()
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79 :tag("author")
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80 :tag("name"):text(commit.author.name):up()
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81 :tag("email"):text(commit.author.email):up()
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82 :up()
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83 );
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84 if not ok then
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85 return error_mapping[err] or 500;
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86 end
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87 end
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88
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89 elseif github_event then
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90 module:log("debug", "Unsupported Github event %q", github_event);
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91 return 501;
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92 end
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93
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94 response.status_code = 202;
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95 return "Thank you Github!";
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96 end
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97
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98 module:provides("http", {
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99 route = {
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100 POST = handle_POST;
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101 };
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102 });
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103
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104 if not node_mapping then
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105 function module.load()
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106 if not pubsub_service.nodes[default_node] then
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107 local ok, err = pubsub_service:create(default_node, true);
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108 if not ok then
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109 module:log("error", "Error creating node: %s", err);
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110 else
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111 module:log("debug", "Node %q created", default_node);
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112 end
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113 end
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114 end
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115 end