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plugins/mod_http_file_share.lua @ 11336:b05331cff47a
mod_http_file_share: Indicate missing token via WWW-Authenticate header
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 29 Jan 2021 15:34:36 +0100 |
parent | 11335:b7acab5e7f57 |
child | 11343:f125ac529c22 |
rev | line source |
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1 -- Prosody IM |
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2 -- Copyright (C) 2021 Kim Alvefur |
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3 -- |
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4 -- This project is MIT/X11 licensed. Please see the |
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5 -- COPYING file in the source package for more information. |
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6 -- |
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7 -- XEP-0363: HTTP File Upload |
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8 -- Again, from the top! |
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9 |
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10 local t_insert = table.insert; |
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11 local jid = require "util.jid"; |
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12 local st = require "util.stanza"; |
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13 local url = require "socket.url"; |
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14 local dm = require "core.storagemanager".olddm; |
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15 local jwt = require "util.jwt"; |
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16 local errors = require "util.error"; |
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17 local dataform = require "util.dataforms".new; |
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18 local dt = require "util.datetime"; |
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19 local hi = require "util.human.units"; |
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20 local cache = require "util.cache"; |
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21 |
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22 local namespace = "urn:xmpp:http:upload:0"; |
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23 |
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24 module:depends("disco"); |
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25 |
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26 module:add_identity("store", "file", module:get_option_string("name", "HTTP File Upload")); |
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27 module:add_feature(namespace); |
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28 |
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29 local uploads = module:open_store("uploads", "archive"); |
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30 -- id, <request>, time, owner |
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31 |
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32 local secret = module:get_option_string(module.name.."_secret", require"util.id".long()); |
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33 local external_base_url = module:get_option_string(module.name .. "_base_url"); |
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34 local file_size_limit = module:get_option_number(module.name .. "_size_limit", 10 * 1024 * 1024); -- 10 MB |
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35 local file_types = module:get_option_set(module.name .. "_allowed_file_types", {}); |
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36 local safe_types = module:get_option_set(module.name .. "_safe_file_types", {"image/*","video/*","audio/*","text/plain"}); |
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37 local expiry = module:get_option_number(module.name .. "_expires_after", 7 * 86400); |
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38 |
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39 local access = module:get_option_set(module.name .. "_access", {}); |
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40 |
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41 if not external_base_url then |
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42 module:depends("http"); |
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43 end |
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44 |
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45 module:add_extension(dataform { |
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46 { name = "FORM_TYPE", type = "hidden", value = namespace }, |
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47 { name = "max-file-size", type = "text-single" }, |
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48 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result")); |
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49 |
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50 local upload_errors = errors.init(module.name, namespace, { |
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51 access = { type = "auth"; condition = "forbidden" }; |
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52 filename = { type = "modify"; condition = "bad-request"; text = "Invalid filename" }; |
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53 filetype = { type = "modify"; condition = "not-acceptable"; text = "File type not allowed" }; |
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54 filesize = { type = "modify"; condition = "not-acceptable"; text = "File too large"; |
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55 extra = {tag = st.stanza("file-too-large", {xmlns = namespace}):tag("max-file-size"):text(tostring(file_size_limit)) }; |
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56 }; |
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57 filesizefmt = { type = "modify"; condition = "bad-request"; text = "File size must be positive integer"; } |
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58 }); |
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59 |
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60 local upload_cache = cache.new(1024); |
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61 |
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62 -- Convenience wrapper for logging file sizes |
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63 local function B(bytes) return hi.format(bytes, "B", "b"); end |
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64 |
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65 local function get_filename(slot, create) |
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66 return dm.getpath(slot, module.host, module.name, "bin", create) |
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67 end |
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68 |
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69 function may_upload(uploader, filename, filesize, filetype) -- > boolean, error |
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70 local uploader_host = jid.host(uploader); |
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71 if not ((access:empty() and prosody.hosts[uploader_host]) or access:contains(uploader) or access:contains(uploader_host)) then |
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72 return false, upload_errors.new("access"); |
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73 end |
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74 |
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75 if not filename or filename:find"/" then |
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76 -- On Linux, only '/' and '\0' are invalid in filenames and NUL can't be in XML |
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77 return false, upload_errors.new("filename"); |
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78 end |
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79 |
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80 if not filesize or filesize < 0 or filesize % 1 ~= 0 then |
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81 return false, upload_errors.new("filesizefmt"); |
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82 end |
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83 if filesize > file_size_limit then |
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84 return false, upload_errors.new("filesize"); |
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85 end |
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86 |
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87 if not ( file_types:empty() or file_types:contains(filetype) or file_types:contains(filetype:gsub("/.*", "/*")) ) then |
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88 return false, upload_errors.new("filetype"); |
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89 end |
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90 |
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91 return true; |
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92 end |
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93 |
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94 function get_authz(uploader, filename, filesize, filetype, slot) |
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95 return jwt.sign(secret, { |
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96 sub = uploader; |
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97 filename = filename; |
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98 filesize = filesize; |
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99 filetype = filetype; |
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100 slot = slot; |
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101 exp = os.time()+300; |
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102 }); |
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103 end |
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104 |
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105 function get_url(slot, filename) |
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106 local base_url = external_base_url or module:http_url(); |
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107 local slot_url = url.parse(base_url); |
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108 slot_url.path = url.parse_path(slot_url.path or "/"); |
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109 t_insert(slot_url.path, slot); |
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110 if filename then |
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111 t_insert(slot_url.path, filename); |
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112 slot_url.path.is_directory = false; |
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113 else |
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114 slot_url.path.is_directory = true; |
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115 end |
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116 slot_url.path = url.build_path(slot_url.path); |
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117 return url.build(slot_url); |
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118 end |
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119 |
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120 function handle_slot_request(event) |
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121 local stanza, origin = event.stanza, event.origin; |
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122 |
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123 local request = st.clone(stanza.tags[1], true); |
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124 local filename = request.attr.filename; |
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125 local filesize = tonumber(request.attr.size); |
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126 local filetype = request.attr["content-type"] or "application/octet-stream"; |
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127 local uploader = jid.bare(stanza.attr.from); |
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128 |
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129 local may, why_not = may_upload(uploader, filename, filesize, filetype); |
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130 if not may then |
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131 origin.send(st.error_reply(stanza, why_not)); |
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132 return true; |
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133 end |
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134 |
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135 module:log("info", "Issuing upload slot to %s for %s", uploader, B(filesize)); |
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136 local slot, storage_err = errors.coerce(uploads:append(nil, nil, request, os.time(), uploader)) |
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137 if not slot then |
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138 origin.send(st.error_reply(stanza, storage_err)); |
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139 return true; |
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140 end |
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141 |
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142 local authz = get_authz(uploader, filename, filesize, filetype, slot); |
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143 local slot_url = get_url(slot, filename); |
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144 local upload_url = slot_url; |
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145 |
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146 local reply = st.reply(stanza) |
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147 :tag("slot", { xmlns = namespace }) |
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148 :tag("get", { url = slot_url }):up() |
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149 :tag("put", { url = upload_url }) |
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150 :text_tag("header", "Bearer "..authz, {name="Authorization"}) |
11309
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151 :reset(); |
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152 |
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153 origin.send(reply); |
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154 return true; |
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155 end |
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156 |
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157 function handle_upload(event, path) -- PUT /upload/:slot |
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158 local request = event.request; |
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159 local authz = request.headers.authorization; |
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160 if authz then |
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161 authz = authz:match("^Bearer (.*)") |
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162 end |
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163 if not authz then |
11335
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164 module:log("debug", "Missing or malformed Authorization header"); |
11336
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165 event.response.headers.www_authenticate = "Bearer"; |
11309
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166 return 403; |
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167 end |
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168 local authed, upload_info = jwt.verify(secret, authz); |
11309
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169 if not (authed and type(upload_info) == "table" and type(upload_info.exp) == "number") then |
11321
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170 module:log("debug", "Unauthorized or invalid token: %s, %q", authed, upload_info); |
11309
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171 return 401; |
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172 end |
11334
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173 if not request.body_sink and upload_info.exp < os.time() then |
11321
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174 module:log("debug", "Authorization token expired on %s", dt.datetime(upload_info.exp)); |
11309
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175 return 410; |
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176 end |
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177 if not path or upload_info.slot ~= path:match("^[^/]+") then |
11321
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178 module:log("debug", "Invalid upload slot: %q, path: %q", upload_info.slot, path); |
11309
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179 return 400; |
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180 end |
11323
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181 if request.headers.content_length and tonumber(request.headers.content_length) ~= upload_info.filesize then |
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182 return 413; |
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183 -- Note: We don't know the size if the upload is streamed in chunked encoding, |
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184 -- so we also check the final file size on completion. |
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185 end |
11309
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186 |
11325
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11324
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187 local filename = get_filename(upload_info.slot, true); |
11324
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188 |
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189 |
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190 if not request.body_sink then |
11321
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191 module:log("debug", "Preparing to receive upload into %q, expecting %s", filename, B(upload_info.filesize)); |
11309
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192 local fh, err = errors.coerce(io.open(filename.."~", "w")); |
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193 if not fh then |
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194 return err; |
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195 end |
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196 request.body_sink = fh; |
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197 if request.body == false then |
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198 return true; |
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199 end |
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200 end |
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201 |
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202 if request.body then |
11321
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203 module:log("debug", "Complete upload available, %s", B(#request.body)); |
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204 -- Small enough to have been uploaded already |
11309
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205 local written, err = errors.coerce(request.body_sink:write(request.body)); |
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206 if not written then |
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207 return err; |
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208 end |
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209 request.body = nil; |
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210 end |
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211 |
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212 if request.body_sink then |
11316
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213 local final_size = request.body_sink:seek(); |
11309
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214 local uploaded, err = errors.coerce(request.body_sink:close()); |
11316
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215 if final_size ~= upload_info.filesize then |
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216 -- Could be too short as well, but we say the same thing |
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217 uploaded, err = false, 413; |
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218 end |
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219 if uploaded then |
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220 module:log("debug", "Upload of %q completed, %s", filename, B(final_size)); |
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221 assert(os.rename(filename.."~", filename)); |
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222 |
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223 upload_cache:set(upload_info.slot, { |
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224 name = upload_info.filename; |
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225 size = tostring(upload_info.filesize); |
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226 type = upload_info.filetype; |
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227 time = os.time(); |
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228 }); |
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229 return 201; |
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230 else |
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231 assert(os.remove(filename.."~")); |
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232 return err; |
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233 end |
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234 end |
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235 |
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236 end |
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237 |
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238 function handle_download(event, path) -- GET /uploads/:slot+filename |
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239 local request, response = event.request, event.response; |
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240 local slot_id = path:match("^[^/]+"); |
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241 local basename, filetime, filetype, filesize; |
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242 local cached = upload_cache:get(slot_id); |
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243 if cached then |
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244 module:log("debug", "Cache hit"); |
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245 -- TODO stats (instead of logging?) |
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246 basename = cached.name; |
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247 filesize = cached.size; |
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248 filetype = cached.type; |
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249 filetime = cached.time; |
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250 upload_cache:set(slot_id, cached); |
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251 -- TODO cache negative hits? |
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252 else |
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253 module:log("debug", "Cache miss"); |
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254 local slot, when = errors.coerce(uploads:get(nil, slot_id)); |
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255 if not slot then |
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256 module:log("debug", "uploads:get(%q) --> not-found, %s", slot_id, when); |
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257 else |
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258 module:log("debug", "uploads:get(%q) --> %s, %d", slot_id, slot, when); |
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259 basename = slot.attr.filename; |
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260 filesize = slot.attr.size; |
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261 filetype = slot.attr["content-type"]; |
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262 filetime = when; |
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263 upload_cache:set(slot_id, { |
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264 name = basename; |
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265 size = slot.attr.size; |
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266 type = filetype; |
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267 time = when; |
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268 }); |
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269 end |
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270 end |
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271 if not basename then |
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272 return 404; |
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273 end |
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274 local last_modified = os.date('!%a, %d %b %Y %H:%M:%S GMT', filetime); |
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275 if request.headers.if_modified_since == last_modified then |
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276 return 304; |
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277 end |
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278 local filename = get_filename(slot_id); |
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279 local handle, ferr = errors.coerce(io.open(filename)); |
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280 if not handle then |
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281 return ferr or 410; |
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282 end |
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283 |
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284 local disposition = "attachment"; |
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285 if safe_types:contains(filetype) or safe_types:contains(filetype:gsub("/.*", "/*")) then |
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286 disposition = "inline"; |
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287 end |
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288 |
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289 response.headers.last_modified = last_modified; |
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290 response.headers.content_length = filesize; |
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291 response.headers.content_type = filetype or "application/octet-stream"; |
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292 response.headers.content_disposition = string.format("%s; filename=%q", disposition, basename); |
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293 |
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294 response.headers.cache_control = "max-age=31556952, immutable"; |
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295 response.headers.content_security_policy = "default-src 'none'; frame-ancestors 'none';" |
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296 response.headers.strict_transport_security = "max-age=31556952"; |
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297 response.headers.x_content_type_options = "nosniff"; |
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298 response.headers.x_frame_options = "DENY"; -- replaced by frame-ancestors in CSP? |
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299 response.headers.x_xss_protection = "1; mode=block"; |
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300 |
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301 return response:send_file(handle); |
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302 end |
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303 |
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304 if expiry >= 0 and not external_base_url then |
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305 -- TODO HTTP DELETE to the external endpoint? |
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306 local array = require "util.array"; |
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307 local async = require "util.async"; |
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308 local ENOENT = require "util.pposix".ENOENT; |
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309 |
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310 local function sleep(t) |
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311 local wait, done = async.waiter(); |
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312 module:add_timer(t, done) |
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313 wait(); |
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314 end |
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315 |
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316 local reaper_task = async.runner(function(boundary_time) |
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317 local iter, total = assert(uploads:find(nil, {["end"] = boundary_time; total = true})); |
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318 |
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319 if total == 0 then |
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320 module:log("info", "No expired to prune"); |
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321 return; |
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322 end |
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323 |
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324 module:log("info", "Pruning expired files uploaded earlier than %s", dt.datetime(boundary_time)); |
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325 |
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326 local obsolete_files = array(); |
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327 local i = 0; |
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328 for slot_id in iter do |
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329 i = i + 1; |
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330 obsolete_files:push(get_filename(slot_id)); |
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331 upload_cache:set(slot_id, nil); |
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332 end |
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333 |
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334 sleep(0.1); |
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335 local n = 0; |
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336 obsolete_files:filter(function(filename) |
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337 n = n + 1; |
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338 if i % 100 == 0 then sleep(0.1); end |
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339 local deleted, err, errno = os.remove(filename); |
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340 if deleted or errno == ENOENT then |
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341 return false; |
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342 else |
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343 module:log("error", "Could not delete file %q: %s", filename, err); |
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344 return true; |
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345 end |
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346 end); |
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347 |
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348 local deletion_query = {["end"] = boundary_time}; |
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349 if #obsolete_files == 0 then |
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350 module:log("info", "All %d expired files deleted", n); |
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351 else |
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352 module:log("warn", "%d out of %d expired files could not be deleted", #obsolete_files, n); |
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353 deletion_query = {ids = obsolete_files}; |
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354 end |
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355 |
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356 local removed, err = uploads:delete(nil, deletion_query); |
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357 |
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358 if removed == true or removed == n or removed == #obsolete_files then |
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359 module:log("debug", "Removed all metadata for expired uploaded files"); |
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360 else |
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361 module:log("error", "Problem removing metadata for deleted files: %s", err); |
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362 end |
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363 |
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364 end); |
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365 |
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366 module:add_timer(1, function () |
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367 reaper_task:run(os.time()-expiry); |
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368 return 60*60; |
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369 end); |
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370 end |
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371 |
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372 module:hook("iq-get/host/urn:xmpp:http:upload:0:request", handle_slot_request); |
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373 |
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374 if not external_base_url then |
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375 module:provides("http", { |
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376 streaming_uploads = true; |
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377 route = { |
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378 ["PUT /*"] = handle_upload; |
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379 ["GET /*"] = handle_download; |
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380 } |
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381 }); |
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382 end |