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mod_http_upload_external/mod_http_upload_external.lua @ 2964:1c336d0d0214
mod_net_proxy: Fixed small indentation mistake in docs
author | Pascal Mathis <mail@pascalmathis.com> |
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date | Thu, 29 Mar 2018 22:07:18 +0200 |
parent | 2939:280305c043b0 |
child | 2978:ac99a04231b1 |
rev | line source |
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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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19 |
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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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26 |
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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, 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); |