prosody-modules
c4002aae4ad3
mod_http_upload_external/mod_http_upload_external.lua

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mod_http_upload_external/mod_http_upload_external.lua @ 4203:c4002aae4ad3

mod_s2s_keepalive: Use timestamp as iq @id RFC 6120 implies that the id attribute must be unique within a stream. This should fix problems with remote servers that enforce uniqueness and don't answer duplicated ids. If it doesn't do that, then at least you can get a guesstimate at round-trip time from the difference between the result iq stanza and the timestamp it was logged without having to go look for when it was sent, or needing to keep state.
author Kim Alvefur <zash@zash.se>
date Wed, 14 Oct 2020 18:02:10 +0200
parent 3167:bedd3f4a8f90
child 4509:16995e7624f0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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"),
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18 module.name .. "_base_url is a required option");
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19 local secret = assert(module:get_option_string(module.name .. "_secret"),
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20 module.name .. "_secret is a required option");
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21
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22 local token_protocol = module:get_option_string(module.name .. "_protocol", "v1");
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24 -- depends
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25 module:depends("disco");
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26
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27 -- namespace
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28 local legacy_namespace = "urn:xmpp:http:upload";
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29 local namespace = "urn:xmpp:http:upload:0";
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30
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31 -- identity and feature advertising
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32 module:add_identity("store", "file", module:get_option_string("name", "HTTP File Upload"))
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33 module:add_feature(namespace);
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34 module:add_feature(legacy_namespace);
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35
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36 module:add_extension(dataform {
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37 { name = "FORM_TYPE", type = "hidden", value = namespace },
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38 { name = "max-file-size", type = "text-single" },
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39 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result"));
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40
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41 module:add_extension(dataform {
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42 { name = "FORM_TYPE", type = "hidden", value = legacy_namespace },
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43 { name = "max-file-size", type = "text-single" },
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44 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result"));
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45
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46 local function magic_crypto_dust(random, filename, filesize, filetype)
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47 local param, message;
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48 if token_protocol == "v1" then
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49 param, message = "v", string.format("%s/%s %d", random, filename, filesize);
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50 else
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51 param, message = "v2", string.format("%s/%s\0%d\0%s", random, filename, filesize, filetype);
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52 end
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53 local digest = HMAC(secret, message, true);
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54 random, filename = http.urlencode(random), http.urlencode(filename);
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55 return base_url .. random .. "/" .. filename, "?"..param.."=" .. digest;
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56 end
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57
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58 local function handle_request(origin, stanza, xmlns, filename, filesize, filetype)
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59 -- local clients only
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60 if origin.type ~= "c2s" then
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61 module:log("debug", "Request for upload slot from a %s", origin.type);
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62 origin.send(st.error_reply(stanza, "cancel", "not-authorized"));
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63 return nil, nil;
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64 end
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65 -- validate
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66 if not filename or filename:find("/") then
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67 module:log("debug", "Filename %q not allowed", filename or "");
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68 origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid filename"));
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69 return nil, nil;
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70 end
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71 if not filesize then
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72 module:log("debug", "Missing file size");
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73 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing or invalid file size"));
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74 return nil, nil;
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75 elseif filesize > file_size_limit then
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76 module:log("debug", "File too large (%d > %d)", filesize, file_size_limit);
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77 origin.send(st.error_reply(stanza, "modify", "not-acceptable", "File too large",
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78 st.stanza("file-too-large", {xmlns=xmlns})
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79 :tag("max-size"):text(tostring(file_size_limit))));
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80 return nil, nil;
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81 end
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82 local random = uuid();
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83 local get_url, verify = magic_crypto_dust(random, filename, filesize, filetype);
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84 local put_url = get_url .. verify;
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85
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86 module:log("debug", "Handing out upload slot %s to %s@%s [%d %s]", get_url, origin.username, origin.host, filesize, filetype);
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87
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88 return get_url, put_url;
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89 end
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90
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91 -- hooks
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92 module:hook("iq/host/"..legacy_namespace..":request", function (event)
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93 local stanza, origin = event.stanza, event.origin;
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94 local request = stanza.tags[1];
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95 local filename = request:get_child_text("filename");
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96 local filesize = tonumber(request:get_child_text("size"));
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97 local filetype = request:get_child_text("content-type") or "application/octet-stream";
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98
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99 local get_url, put_url = handle_request(
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100 origin, stanza, legacy_namespace, filename, filesize, filetype);
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101
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102 if not get_url then
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103 -- error was already sent
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104 return true;
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105 end
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106
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107 local reply = st.reply(stanza)
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108 :tag("slot", { xmlns = legacy_namespace })
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109 :tag("get"):text(get_url):up()
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110 :tag("put"):text(put_url):up()
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111 :up();
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112 origin.send(reply);
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113 return true;
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114 end);
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115
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116 module:hook("iq/host/"..namespace..":request", function (event)
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117 local stanza, origin = event.stanza, event.origin;
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118 local request = stanza.tags[1];
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119 local filename = request.attr.filename;
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120 local filesize = tonumber(request.attr.size);
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121 local filetype = request.attr["content-type"] or "application/octet-stream";
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122
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123 local get_url, put_url = handle_request(
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124 origin, stanza, namespace, filename, filesize, filetype);
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125
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126 if not get_url then
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127 -- error was already sent
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128 return true;
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129 end
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130
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131 local reply = st.reply(stanza)
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132 :tag("slot", { xmlns = namespace})
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133 :tag("get", { url = get_url }):up()
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134 :tag("put", { url = put_url }):up()
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135 :up();
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136 origin.send(reply);
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137 return true;
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138 end);