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annotate mod_http_upload_external/mod_http_upload_external.lua @ 2919:0ea93da47db9

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mod_conversejs: Allow passing arbitrary options trough to Converse.js
author Kim Alvefur <zash@zash.se>
date Sat, 10 Mar 2018 00:05:30 +0100
parents d6badf56ab5f
children 280305c043b0
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1 -- mod_http_upload_external
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2 --
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3 -- Copyright (C) 2015-2016 Kim Alvefur
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4 --
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5 -- This file is MIT/X11 licensed.
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6 --
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7
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8 -- imports
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9 local st = require"util.stanza";
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10 local uuid = require"util.uuid".generate;
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11 local http = require "util.http";
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12 local dataform = require "util.dataforms".new;
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13 local HMAC = require "util.hashes".hmac_sha256;
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14
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15 -- config
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16 local file_size_limit = module:get_option_number(module.name .. "_file_size_limit", 100 * 1024 * 1024); -- 100 MB
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17 local base_url = assert(module:get_option_string(module.name .. "_base_url"), module.name .. "_base_url is a required option");
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18 local secret = assert(module:get_option_string(module.name .. "_secret"), module.name .. "_secret is a required option");
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20 -- depends
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21 module:depends("disco");
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22
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23 -- namespace
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24 local legacy_namespace = "urn:xmpp:http:upload";
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25 local namespace = "urn:xmpp:http:upload:0";
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27 -- identity and feature advertising
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28 module:add_identity("store", "file", module:get_option_string("name", "HTTP File Upload"))
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29 module:add_feature(namespace);
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30 module:add_feature(legacy_namespace);
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31
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32 module:add_extension(dataform {
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33 { name = "FORM_TYPE", type = "hidden", value = namespace },
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34 { name = "max-file-size", type = "text-single" },
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35 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result"));
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36
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37 module:add_extension(dataform {
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38 { name = "FORM_TYPE", type = "hidden", value = legacy_namespace },
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39 { name = "max-file-size", type = "text-single" },
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40 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result"));
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41
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42 local function magic_crypto_dust(random, filename, filesize)
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43 local message = string.format("%s/%s %d", random, filename, filesize);
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44 local digest = HMAC(secret, message, true);
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45 random, filename = http.urlencode(random), http.urlencode(filename);
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46 return base_url .. random .. "/" .. filename, "?v=" .. digest;
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47 end
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48
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49 local function handle_request(origin, stanza, xmlns, filename, filesize)
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50 -- local clients only
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51 if origin.type ~= "c2s" then
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52 module:log("debug", "Request for upload slot from a %s", origin.type);
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53 origin.send(st.error_reply(stanza, "cancel", "not-authorized"));
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54 return nil, nil;
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55 end
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56 -- validate
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57 if not filename or filename:find("/") then
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58 module:log("debug", "Filename %q not allowed", filename or "");
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59 origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid filename"));
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60 return nil, nil;
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61 end
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62 if not filesize then
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63 module:log("debug", "Missing file size");
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64 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing or invalid file size"));
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65 return nil, nil;
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66 elseif filesize > file_size_limit then
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67 module:log("debug", "File too large (%d > %d)", filesize, file_size_limit);
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68 origin.send(st.error_reply(stanza, "modify", "not-acceptable", "File too large",
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69 st.stanza("file-too-large", {xmlns=xmlns})
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70 :tag("max-size"):text(tostring(file_size_limit))));
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71 return nil, nil;
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72 end
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73 local random = uuid();
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74 local get_url, verify = magic_crypto_dust(random, filename, filesize);
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75 local put_url = get_url .. verify;
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76
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77 module:log("info", "Handing out upload slot %s to %s@%s", get_url, origin.username, origin.host);
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78
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79 return get_url, put_url;
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80 end
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81
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82 -- hooks
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83 module:hook("iq/host/"..legacy_namespace..":request", function (event)
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84 local stanza, origin = event.stanza, event.origin;
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85 local request = stanza.tags[1];
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86 local filename = request:get_child_text("filename");
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87 local filesize = tonumber(request:get_child_text("size"));
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88
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89 local get_url, put_url = handle_request(
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90 origin, stanza, legacy_namespace, filename, filesize);
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91
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92 if not get_url then
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93 -- error was already sent
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94 return true;
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95 end
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96
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97 local reply = st.reply(stanza)
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98 :tag("slot", { xmlns = legacy_namespace })
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99 :tag("get"):text(get_url):up()
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100 :tag("put"):text(put_url):up()
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101 :up();
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102 origin.send(reply);
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103 return true;
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104 end);
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105
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106 module:hook("iq/host/"..namespace..":request", function (event)
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107 local stanza, origin = event.stanza, event.origin;
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108 local request = stanza.tags[1];
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109 local filename = request.attr.filename;
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110 local filesize = tonumber(request.attr.size);
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111 local get_url, put_url = handle_request(
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112 origin, stanza, legacy_namespace, filename, filesize);
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113
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114 if not get_url then
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115 -- error was already sent
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116 return true;
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117 end
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118
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119 local reply = st.reply(stanza)
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120 :tag("slot", { xmlns = namespace})
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121 :tag("get", { url = get_url }):up()
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122 :tag("put", { url = put_url }):up()
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123 :up();
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124 origin.send(reply);
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125 return true;
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126 end);