prosody-modules
03c5639882a7
mod_http_upload/mod_http_upload.lua

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mod_http_upload/mod_http_upload.lua @ 1851:03c5639882a7

mod_http_upload: Add support for a file size limit
author Kim Alvefur <zash@zash.se>
date Mon, 14 Sep 2015 12:49:54 +0200
parent 1850:e3a0ebe671cc
child 1874:8ef500508c59
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1772
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
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
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15 local function join_path(a, b)
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16 return a .. package.config:sub(1,1) .. b;
1815
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parents: 1805
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17 end
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18
1851
03c5639882a7 mod_http_upload: Add support for a file size limit
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parents: 1850
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19 -- config
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20 local file_size_limit = module:get_option_number(module.name .. "_file_size_limit", 10 * 1024 * 1024); -- 10 MB
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21
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22 -- depends
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23 module:depends("http");
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24 module:depends("disco");
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25
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26 -- namespace
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27 local xmlns_http_upload = "eu:siacs:conversations:http:upload";
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28
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29 module:add_feature(xmlns_http_upload);
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30
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31 -- state
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32 local pending_slots = module:shared("upload_slots");
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33
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34 local storage_path = join_path(prosody.paths.data, module.name);
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35 lfs.mkdir(storage_path);
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36
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37 -- hooks
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38 module:hook("iq/host/"..xmlns_http_upload..":request", function (event)
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39 local stanza, origin = event.stanza, event.origin;
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40 local request = stanza.tags[1];
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41 -- local clients only
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42 if origin.type ~= "c2s" then
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43 origin.send(st.error_reply(stanza, "cancel", "not-authorized"));
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44 return true;
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45 end
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46 -- validate
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47 local filename = request:get_child_text("filename");
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48 if not filename or filename:find("/") then
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49 origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid filename"));
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50 return true;
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51 end
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52 local filesize = tonumber(request:get_child_text("size"));
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53 if not filesize then
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54 origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing or invalid file size"));
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55 return true;
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56 elseif filesize > file_size_limit then
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57 origin.send(st.error_reply(stanza, "modify", "not-acceptable", "File too large",
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58 st.stanza("file-too-large", {xmlns=xmlns_http_upload})
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59 :tag("max-size"):text(tostring(file_size_limit))));
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60 return true;
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61 end
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62 local reply = st.reply(stanza);
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63 reply:tag("slot", { xmlns = xmlns_http_upload });
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64 local random = uuid();
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65 pending_slots[random.."/"..filename] = origin.full_jid;
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66 local url = module:http_url() .. "/" .. random .. "/" .. filename;
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67 reply:tag("get"):text(url):up();
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68 reply:tag("put"):text(url):up();
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69 origin.send(reply);
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70 return true;
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71 end);
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72
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73 -- http service
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74 local function upload_data(event, path)
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75 if not pending_slots[path] then
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76 return 401;
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77 end
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78 local random, filename = path:match("^([^/]+)/([^/]+)$");
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79 if not random then
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80 return 400;
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81 end
1851
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82 if #event.request.body > file_size_limit then
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83 module:log("error", "Uploaded file too large %d bytes", #event.request.body);
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84 return 400;
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85 end
1772
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86 local dirname = join_path(storage_path, random);
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87 if not lfs.mkdir(dirname) then
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88 module:log("error", "Could not create directory %s for upload", dirname);
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89 return 500;
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90 end
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91 local full_filename = join_path(dirname, filename);
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92 local fh, ferr = io.open(full_filename, "w");
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93 if not fh then
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94 module:log("error", "Could not open file %s for upload: %s", full_filename, ferr);
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95 return 500;
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96 end
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97 local ok, err = fh:write(event.request.body);
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98 if not ok then
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99 module:log("error", "Could not write to file %s for upload: %s", full_filename, err);
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100 os.remove(full_filename);
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101 return 500;
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102 end
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103 ok, err = fh:close();
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104 if not ok then
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105 module:log("error", "Could not write to file %s for upload: %s", full_filename, err);
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106 os.remove(full_filename);
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107 return 500;
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108 end
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Kim Alvefur <zash@zash.se>
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109 module:log("info", "File uploaded by %s to slot %s", pending_slots[path], random);
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110 pending_slots[path] = nil;
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111 return 200;
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112 end
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113
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114 local serve_uploaded_files = module:depends("http_files").serve(storage_path);
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115
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116 local function size_only(request, data)
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117 request.headers.content_size = #data;
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118 return 200;
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119 end
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120
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121 local function serve_head(event, path)
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122 event.send = size_only;
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123 return serve_uploaded_files(event, path);
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124 end
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125
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parents:
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126 module:provides("http", {
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127 route = {
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128 ["GET /*"] = serve_uploaded_files;
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129 ["HEAD /*"] = serve_head;
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130 ["PUT /*"] = upload_data;
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131 };
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132 });
1849
5244c9b0b297 mod_http_upload: Log a message with the upload URL and storage path for easy discovery
Kim Alvefur <zash@zash.se>
parents: 1848
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133
5244c9b0b297 mod_http_upload: Log a message with the upload URL and storage path for easy discovery
Kim Alvefur <zash@zash.se>
parents: 1848
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134 module:log("info", "URL: <%s>; Storage path: %s", module:http_url(), storage_path);