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mod_http_upload/mod_http_upload.lua @ 1942:ff95d983940c
mod_http_upload: Say Hello to anyone opening the "bare" HTTP URL (helpful to show that module is loaded correctly)
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 01 Nov 2015 18:12:49 +0100 |
parent | 1914:b01d60dfa405 |
child | 1966:3b748666ff97 |
rev | line source |
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1 -- mod_http_upload |
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2 -- |
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3 -- Copyright (C) 2015 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 -- Implementation of HTTP Upload file transfer mechanism used by Conversations |
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8 -- |
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9 |
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10 -- imports |
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11 local st = require"util.stanza"; |
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12 local lfs = require"lfs"; |
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13 local uuid = require"util.uuid".generate; |
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14 local t_concat = table.concat; |
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15 local t_insert = table.insert; |
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16 local s_upper = string.upper; |
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17 |
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18 local function join_path(a, b) |
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19 return a .. package.config:sub(1,1) .. b; |
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20 end |
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21 |
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22 -- config |
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23 local file_size_limit = module:get_option_number(module.name .. "_file_size_limit", 10 * 1024 * 1024); -- 10 MB |
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24 |
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25 -- depends |
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26 module:depends("http"); |
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27 module:depends("disco"); |
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28 |
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29 -- namespace |
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30 local xmlns_http_upload = "urn:xmpp:http:upload"; |
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31 |
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32 module:add_feature(xmlns_http_upload); |
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33 |
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34 -- state |
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35 local pending_slots = module:shared("upload_slots"); |
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36 |
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37 local storage_path = join_path(prosody.paths.data, module.name); |
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38 lfs.mkdir(storage_path); |
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39 |
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40 -- hooks |
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41 module:hook("iq/host/"..xmlns_http_upload..":request", function (event) |
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42 local stanza, origin = event.stanza, event.origin; |
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43 local request = stanza.tags[1]; |
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44 -- local clients only |
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45 if origin.type ~= "c2s" then |
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46 origin.send(st.error_reply(stanza, "cancel", "not-authorized")); |
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47 return true; |
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48 end |
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49 -- validate |
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50 local filename = request:get_child_text("filename"); |
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51 if not filename or filename:find("/") then |
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52 origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid filename")); |
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53 return true; |
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54 end |
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55 local filesize = tonumber(request:get_child_text("size")); |
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56 if not filesize then |
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57 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing or invalid file size")); |
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58 return true; |
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59 elseif filesize > file_size_limit then |
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60 origin.send(st.error_reply(stanza, "modify", "not-acceptable", "File too large", |
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61 st.stanza("file-too-large", {xmlns=xmlns_http_upload}) |
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62 :tag("max-size"):text(tostring(file_size_limit)))); |
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63 return true; |
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64 end |
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65 local reply = st.reply(stanza); |
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66 reply:tag("slot", { xmlns = xmlns_http_upload }); |
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67 local random = uuid(); |
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68 pending_slots[random.."/"..filename] = origin.full_jid; |
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69 local url = module:http_url() .. "/" .. random .. "/" .. filename; |
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70 reply:tag("get"):text(url):up(); |
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71 reply:tag("put"):text(url):up(); |
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72 origin.send(reply); |
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73 return true; |
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74 end); |
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75 |
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76 -- http service |
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77 local function upload_data(event, path) |
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78 if not pending_slots[path] then |
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79 return 401; |
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80 end |
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81 local random, filename = path:match("^([^/]+)/([^/]+)$"); |
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82 if not random then |
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83 return 400; |
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84 end |
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85 if #event.request.body > file_size_limit then |
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86 module:log("error", "Uploaded file too large %d bytes", #event.request.body); |
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87 return 400; |
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88 end |
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89 local dirname = join_path(storage_path, random); |
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90 if not lfs.mkdir(dirname) then |
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91 module:log("error", "Could not create directory %s for upload", dirname); |
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92 return 500; |
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93 end |
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94 local full_filename = join_path(dirname, filename); |
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95 local fh, ferr = io.open(full_filename, "w"); |
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96 if not fh then |
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97 module:log("error", "Could not open file %s for upload: %s", full_filename, ferr); |
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98 return 500; |
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99 end |
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100 local ok, err = fh:write(event.request.body); |
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101 if not ok then |
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102 module:log("error", "Could not write to file %s for upload: %s", full_filename, err); |
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103 os.remove(full_filename); |
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104 return 500; |
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105 end |
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106 ok, err = fh:close(); |
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107 if not ok then |
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108 module:log("error", "Could not write to file %s for upload: %s", full_filename, err); |
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109 os.remove(full_filename); |
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110 return 500; |
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111 end |
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112 module:log("info", "File uploaded by %s to slot %s", pending_slots[path], random); |
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113 pending_slots[path] = nil; |
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114 return 200; |
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115 end |
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116 |
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117 -- FIXME Duplicated from net.http.server |
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118 |
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119 local codes = require "net.http.codes"; |
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120 local headerfix = setmetatable({}, { |
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121 __index = function(t, k) |
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122 local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": "; |
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123 t[k] = v; |
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124 return v; |
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125 end |
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126 }); |
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127 |
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128 local function send_response_sans_body(response, body) |
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129 if response.finished then return; end |
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130 response.finished = true; |
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131 response.conn._http_open_response = nil; |
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132 |
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133 local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]); |
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134 local headers = response.headers; |
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135 body = body or response.body or ""; |
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136 headers.content_length = #body; |
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137 |
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138 local output = { status_line }; |
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139 for k,v in pairs(headers) do |
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140 t_insert(output, headerfix[k]..v); |
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141 end |
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142 t_insert(output, "\r\n\r\n"); |
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143 -- Here we *don't* add the body to the output |
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144 |
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145 response.conn:write(t_concat(output)); |
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146 if response.on_destroy then |
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147 response:on_destroy(); |
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148 response.on_destroy = nil; |
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149 end |
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150 if response.persistent then |
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151 response:finish_cb(); |
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152 else |
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153 response.conn:close(); |
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154 end |
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155 end |
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156 |
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157 local serve_uploaded_files = module:depends("http_files").serve(storage_path); |
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158 |
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159 local function serve_head(event, path) |
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160 event.response.send = send_response_sans_body; |
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161 return serve_uploaded_files(event, path); |
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162 end |
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163 |
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164 local function serve_hello(event) |
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165 event.response.headers.content_type = "text/html;charset=utf-8" |
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166 return "<!DOCTYPE html>\n<h1>Hello from mod_"..module.name.."!</h1>\n"; |
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167 end |
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168 |
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169 module:provides("http", { |
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170 route = { |
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171 ["GET"] = serve_hello; |
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172 ["GET /"] = serve_hello; |
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173 ["GET /*"] = serve_uploaded_files; |
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174 ["HEAD /*"] = serve_head; |
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175 ["PUT /*"] = upload_data; |
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176 }; |
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177 }); |
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178 |
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179 module:log("info", "URL: <%s>; Storage path: %s", module:http_url(), storage_path); |