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annotate mod_pubsub_post/mod_pubsub_post.lua @ 4521:f7381268a597

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mod_pubsub_post: Add support for mapping incoming JSON to XML Using the new util.datamapper pubsub_post_mappings[node] = filename or schema
author Kim Alvefur <zash@zash.se>
date Mon, 22 Mar 2021 21:18:35 +0100
parents 0d3926e49b55
children 08b71d02c6dc
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
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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 mappings = module:get_option("pubsub_post_mappings", nil);
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20 local datamapper;
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21 if type(mappings) == "table" then
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22 datamapper = require "util.datamapper";
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23 for node, f in pairs(mappings) do
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24 if type(f) == "string" then
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25 local fh = assert(module:load_resource(f));
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26 mappings[node] = assert(json.parse(fh:read("*a")));
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27 fh:close()
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28 end
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29 end
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30 end
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31
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32 local function wrap(node, parsed, raw)
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33 if mappings and mappings[node] then
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34 return datamapper.unparse(mappings[node], parsed)
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35 end
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36 return st.stanza("json", { xmlns="urn:xmpp:json:0" }):text(raw);
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37 end
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38
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39 local error_mapping = {
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40 ["forbidden"] = 403;
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41 ["item-not-found"] = 404;
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42 ["internal-server-error"] = 500;
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43 ["conflict"] = 409;
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44 };
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45
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46 local function publish_payload(node, actor, item_id, payload)
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47 local post_item = st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = item_id, })
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48 :add_child(payload);
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49 local ok, err = pubsub_service:publish(node, actor, item_id, post_item);
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50 module:log("debug", ":publish(%q, true, %q, %s) -> %q", node, item_id, payload:top_tag(), err or "");
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51 if not ok then
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52 return error_mapping[err] or 500;
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53 end
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54 return 202;
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55 end
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56
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57 local function handle_json(node, actor, data)
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58 local parsed, err = json.decode(data);
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59 if not parsed then
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60 return { status_code = 400; body = tostring(err); }
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61 end
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62 if type(parsed) ~= "table" then
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63 return { status_code = 400; body = "object or array expected"; };
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64 end
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65 local payload = wrap(node, parsed, data)
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66 return publish_payload(node, actor, type(parsed.id) == "string" and parsed.id or "current", payload);
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67 end
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68
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69 local function publish_atom(node, actor, feed)
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70 for entry in feed:childtags("entry") do
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71 local item_id = entry:get_child_text("id");
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72 if not item_id then
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73 item_id = uuid_generate();
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74 entry:tag("id"):text(item_id):up();
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75 end
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76 if not entry:get_child_text("published") then
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77 entry:tag("published"):text(timestamp_generate()):up();
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78 end
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79 local resp = publish_payload(node, actor, item_id, entry);
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80 if resp ~= 202 then return resp; end
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81 end
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82 return 202;
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83 end
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84
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85 local function handle_xml(node, actor, payload)
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86 local xmlpayload, err = xml.parse(payload);
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87 if not xmlpayload then
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88 module:log("debug", "XML parse error: %s\n%q", err, payload);
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89 return { status_code = 400, body = tostring(err) };
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90 end
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91 if xmlpayload.attr.xmlns == "http://www.w3.org/2005/Atom" and xmlpayload.name == "feed" then
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92 return publish_atom(node, actor, xmlpayload);
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93 else
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94 return publish_payload(node, actor, "current", xmlpayload);
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95 end
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96 end
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97
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98 local actor_source = module:get_option_string("pubsub_post_actor"); -- COMPAT
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99 local default_secret = module:get_option_string("pubsub_post_default_secret");
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100 local actor_secrets = module:get_option("pubsub_post_secrets");
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101 local actors = module:get_option("pubsub_post_actors");
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102 local default_actor = module:get_option_string("pubsub_post_default_actor");
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103 if not default_actor and actor_source == "superuser" then
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104 default_actor = true;
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105 end
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106
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107 local function verify_signature(secret, body, signature)
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108 if not signature then return false; end
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109 local algo, digest = signature:match("^([^=]+)=(%x+)");
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110 if not algo then return false; end
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111 local hmac = hmacs[algo];
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112 if not algo then return false; end
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113 return hmac(secret, body) == from_hex(digest);
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114 end
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115
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116 function handle_POST(event, path)
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117 local request = event.request;
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118
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119 local content_type = request.headers.content_type or "application/octet-stream";
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120 local actor = actors and actors[path] or default_actor or request.ip;
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121 local secret = actor_secrets and actor_secrets[path] or default_secret;
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122
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123 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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124
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125 if secret and not verify_signature(secret, request.body, request.headers.x_hub_signature) then
3504
9ef5b229f73e mod_pubsub_post: Make debug messages more informative
Kim Alvefur <zash@zash.se>
parents: 3503
diff changeset
126 module:log("debug", "Signature validation failed");
3501
1df139b157fb mod_pubsub_post: Add support for WebSub authentication
Kim Alvefur <zash@zash.se>
parents: 3255
diff changeset
127 return 401;
1df139b157fb mod_pubsub_post: Add support for WebSub authentication
Kim Alvefur <zash@zash.se>
parents: 3255
diff changeset
128 end
1df139b157fb mod_pubsub_post: Add support for WebSub authentication
Kim Alvefur <zash@zash.se>
parents: 3255
diff changeset
129
3255
64d1dfbd1740 mod_pubsub_post: Ensure actor is non-nil (catch inability to determine IP or simliar)
Kim Alvefur <zash@zash.se>
parents: 3254
diff changeset
130 if not actor then
64d1dfbd1740 mod_pubsub_post: Ensure actor is non-nil (catch inability to determine IP or simliar)
Kim Alvefur <zash@zash.se>
parents: 3254
diff changeset
131 return 401;
64d1dfbd1740 mod_pubsub_post: Ensure actor is non-nil (catch inability to determine IP or simliar)
Kim Alvefur <zash@zash.se>
parents: 3254
diff changeset
132 end
64d1dfbd1740 mod_pubsub_post: Ensure actor is non-nil (catch inability to determine IP or simliar)
Kim Alvefur <zash@zash.se>
parents: 3254
diff changeset
133
3014
72dbc9b66de8 mod_pubsub_post: Change to support arbitrary XML payloads
Kim Alvefur <zash@zash.se>
parents: 3013
diff changeset
134 if content_type == "application/xml" or content_type:sub(-4) == "+xml" then
3017
8e48c0b233e0 mod_pubsub_post: Factor out the 'actor' into an argument
Kim Alvefur <zash@zash.se>
parents: 3016
diff changeset
135 return handle_xml(path, actor, request.body);
3016
3f4e2340bfdc mod_pubsub_post: Add support for publishing arbitrary JSON
Kim Alvefur <zash@zash.se>
parents: 3015
diff changeset
136 elseif content_type == "application/json" or content_type:sub(-5) == "+json" then
3017
8e48c0b233e0 mod_pubsub_post: Factor out the 'actor' into an argument
Kim Alvefur <zash@zash.se>
parents: 3016
diff changeset
137 return handle_json(path, actor, request.body);
3014
72dbc9b66de8 mod_pubsub_post: Change to support arbitrary XML payloads
Kim Alvefur <zash@zash.se>
parents: 3013
diff changeset
138 end
72dbc9b66de8 mod_pubsub_post: Change to support arbitrary XML payloads
Kim Alvefur <zash@zash.se>
parents: 3013
diff changeset
139
72dbc9b66de8 mod_pubsub_post: Change to support arbitrary XML payloads
Kim Alvefur <zash@zash.se>
parents: 3013
diff changeset
140 module:log("debug", "Unsupported content-type: %q", content_type);
72dbc9b66de8 mod_pubsub_post: Change to support arbitrary XML payloads
Kim Alvefur <zash@zash.se>
parents: 3013
diff changeset
141 return 415;
1619
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
142 end
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
143
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
144 module:provides("http", {
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
145 route = {
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
146 ["POST /*"] = handle_POST;
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
147 };
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
148 });
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
149
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
150 function module.load()
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
151 module:log("debug", "Loaded at %s", module:http_url());
43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
152 end