prosody
494761f5d7da
plugins/mod_http_file_share.lua

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plugins/mod_http_file_share.lua @ 11324:494761f5d7da

mod_http_file_share: Use '.bin' file extension Distinct from '.dat' used by datamanager / internal stortage for Lua object storage so that they can't easily be loaded by accident that way.
author Kim Alvefur <zash@zash.se>
date Wed, 27 Jan 2021 17:48:12 +0100
parent 11323:a853a018eede
child 11325:76fc73d39092
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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
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21 local namespace = "urn:xmpp:http:upload:0";
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22
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23 module:depends("disco");
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24
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25 module:add_identity("store", "file", module:get_option_string("name", "HTTP File Upload"));
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26 module:add_feature(namespace);
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27
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28 local uploads = module:open_store("uploads", "archive");
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29 -- id, <request>, time, owner
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30
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31 local secret = module:get_option_string(module.name.."_secret", require"util.id".long());
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32 local external_base_url = module:get_option_string(module.name .. "_base_url");
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33 local file_size_limit = module:get_option_number(module.name .. "_size_limit", 10 * 1024 * 1024); -- 10 MB
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34 local file_types = module:get_option_set(module.name .. "_allowed_file_types", {});
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35
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36 local access = module:get_option_set(module.name .. "_access", {});
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37
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38 if not external_base_url then
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39 module:depends("http");
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40 end
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41
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42 module:add_extension(dataform {
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43 { name = "FORM_TYPE", type = "hidden", value = namespace },
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44 { name = "max-file-size", type = "text-single" },
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45 }:form({ ["max-file-size"] = tostring(file_size_limit) }, "result"));
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46
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47 local upload_errors = errors.init(module.name, namespace, {
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48 access = { type = "auth"; condition = "forbidden" };
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49 filename = { type = "modify"; condition = "bad-request"; text = "Invalid filename" };
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50 filetype = { type = "modify"; condition = "not-acceptable"; text = "File type not allowed" };
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51 filesize = { type = "modify"; condition = "not-acceptable"; text = "File too large";
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52 extra = {tag = st.stanza("file-too-large", {xmlns = namespace}):tag("max-file-size"):text(tostring(file_size_limit)) };
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53 filesizefmt = { type = "modify"; condition = "bad-request"; text = "File size must be positive integer"; }
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54 };
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55 });
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56
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57 -- Convenience wrapper for logging file sizes
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58 local function B(bytes) return hi.format(bytes, "B", "b"); end
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59
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60 function may_upload(uploader, filename, filesize, filetype) -- > boolean, error
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61 local uploader_host = jid.host(uploader);
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62 if not ((access:empty() and prosody.hosts[uploader_host]) or access:contains(uploader) or access:contains(uploader_host)) then
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63 return false, upload_errors.new("access");
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64 end
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65
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66 if not filename or filename:find"/" then
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67 -- On Linux, only '/' and '\0' are invalid in filenames and NUL can't be in XML
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68 return false, upload_errors.new("filename");
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69 end
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70
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71 if not filesize or filesize < 0 or filesize % 1 ~= 0 then
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72 return false, upload_errors.new("filesizefmt");
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73 end
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74 if filesize > file_size_limit then
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75 return false, upload_errors.new("filesize");
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76 end
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77
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78 if not ( file_types:empty() or file_types:contains(filetype) or file_types:contains(filetype:gsub("/.*", "/*")) ) then
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79 return false, upload_errors.new("filetype");
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80 end
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81
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82 return true;
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83 end
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84
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85 function get_authz(uploader, filename, filesize, filetype, slot)
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86 return jwt.sign(secret, {
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87 sub = uploader;
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88 filename = filename;
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89 filesize = filesize;
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90 filetype = filetype;
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91 slot = slot;
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92 exp = os.time()+300;
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93 });
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94 end
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95
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96 function get_url(slot, filename)
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97 local base_url = external_base_url or module:http_url();
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98 local slot_url = url.parse(base_url);
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99 slot_url.path = url.parse_path(slot_url.path or "/");
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100 t_insert(slot_url.path, slot);
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101 if filename then
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102 t_insert(slot_url.path, filename);
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103 slot_url.path.is_directory = false;
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104 else
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105 slot_url.path.is_directory = true;
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106 end
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107 slot_url.path = url.build_path(slot_url.path);
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108 return url.build(slot_url);
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109 end
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110
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111 function handle_slot_request(event)
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112 local stanza, origin = event.stanza, event.origin;
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113
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114 local request = st.clone(stanza.tags[1], true);
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115 local filename = request.attr.filename;
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116 local filesize = tonumber(request.attr.size);
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117 local filetype = request.attr["content-type"] or "application/octet-stream";
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118 local uploader = jid.bare(stanza.attr.from);
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119
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120 local may, why_not = may_upload(uploader, filename, filesize, filetype);
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121 if not may then
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parents:
diff changeset
122 origin.send(st.error_reply(stanza, why_not));
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
123 return true;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
124 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
125
11321
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diff changeset
126 module:log("info", "Issuing upload slot to %s for %s", uploader, B(filesize));
11309
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diff changeset
127 local slot, storage_err = errors.coerce(uploads:append(nil, nil, request, os.time(), uploader))
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parents:
diff changeset
128 if not slot then
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
129 origin.send(st.error_reply(stanza, storage_err));
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
130 return true;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
131 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
132
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
133 local authz = get_authz(uploader, filename, filesize, filetype, slot);
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parents:
diff changeset
134 local slot_url = get_url(slot, filename);
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
135 local upload_url = slot_url;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
136
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
137 local reply = st.reply(stanza)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
138 :tag("slot", { xmlns = namespace })
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
139 :tag("get", { url = slot_url }):up()
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
140 :tag("put", { url = upload_url })
11322
4ade9810ce35 mod_http_file_share: Move Authorization type string
Kim Alvefur <zash@zash.se>
parents: 11321
diff changeset
141 :text_tag("header", "Bearer "..authz, {name="Authorization"})
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 :reset();
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
143
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 origin.send(reply);
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
145 return true;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
146 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
147
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
148 function handle_upload(event, path) -- PUT /upload/:slot
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
149 local request = event.request;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
150 local authz = request.headers.authorization;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
151 if not authz or not authz:find"^Bearer ." then
11321
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Kim Alvefur <zash@zash.se>
parents: 11320
diff changeset
152 module:log("debug", "Missing Authorization");
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
153 return 403;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
154 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
155 local authed, upload_info = jwt.verify(secret, authz:match("^Bearer (.*)"));
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
156 if not (authed and type(upload_info) == "table" and type(upload_info.exp) == "number") then
11321
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Kim Alvefur <zash@zash.se>
parents: 11320
diff changeset
157 module:log("debug", "Unauthorized or invalid token: %s, %q", authed, upload_info);
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
158 return 401;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
159 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
160 if upload_info.exp < os.time() then
11321
15ab878a7d23 mod_http_file_share: Add some logging
Kim Alvefur <zash@zash.se>
parents: 11320
diff changeset
161 module:log("debug", "Authorization token expired on %s", dt.datetime(upload_info.exp));
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
162 return 410;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
163 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
164 if not path or upload_info.slot ~= path:match("^[^/]+") then
11321
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Kim Alvefur <zash@zash.se>
parents: 11320
diff changeset
165 module:log("debug", "Invalid upload slot: %q, path: %q", upload_info.slot, path);
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
166 return 400;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
167 end
11323
a853a018eede mod_http_file_share: Validate file size early in HTTP PUT request
Kim Alvefur <zash@zash.se>
parents: 11322
diff changeset
168 if request.headers.content_length and tonumber(request.headers.content_length) ~= upload_info.filesize then
a853a018eede mod_http_file_share: Validate file size early in HTTP PUT request
Kim Alvefur <zash@zash.se>
parents: 11322
diff changeset
169 return 413;
a853a018eede mod_http_file_share: Validate file size early in HTTP PUT request
Kim Alvefur <zash@zash.se>
parents: 11322
diff changeset
170 -- Note: We don't know the size if the upload is streamed in chunked encoding,
a853a018eede mod_http_file_share: Validate file size early in HTTP PUT request
Kim Alvefur <zash@zash.se>
parents: 11322
diff changeset
171 -- so we also check the final file size on completion.
a853a018eede mod_http_file_share: Validate file size early in HTTP PUT request
Kim Alvefur <zash@zash.se>
parents: 11322
diff changeset
172 end
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
173
11324
494761f5d7da mod_http_file_share: Use '.bin' file extension
Kim Alvefur <zash@zash.se>
parents: 11323
diff changeset
174 local filename = dm.getpath(upload_info.slot, module.host, module.name, "bin", true);
494761f5d7da mod_http_file_share: Use '.bin' file extension
Kim Alvefur <zash@zash.se>
parents: 11323
diff changeset
175
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
176
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
177 if not request.body_sink then
11321
15ab878a7d23 mod_http_file_share: Add some logging
Kim Alvefur <zash@zash.se>
parents: 11320
diff changeset
178 module:log("debug", "Preparing to receive upload into %q, expecting %s", filename, B(upload_info.filesize));
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
179 local fh, err = errors.coerce(io.open(filename.."~", "w"));
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
180 if not fh then
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
181 return err;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
182 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
183 request.body_sink = fh;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
184 if request.body == false then
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
185 return true;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
186 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
187 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
188
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
189 if request.body then
11321
15ab878a7d23 mod_http_file_share: Add some logging
Kim Alvefur <zash@zash.se>
parents: 11320
diff changeset
190 module:log("debug", "Complete upload available, %s", B(#request.body));
15ab878a7d23 mod_http_file_share: Add some logging
Kim Alvefur <zash@zash.se>
parents: 11320
diff changeset
191 -- Small enough to have been uploaded already
11309
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
192 local written, err = errors.coerce(request.body_sink:write(request.body));
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
193 if not written then
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
194 return err;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
195 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
196 request.body = nil;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
197 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
198
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
199 if request.body_sink then
11316
ae0461b37fbe mod_http_file_share: Verify final file size on completion of upload
Kim Alvefur <zash@zash.se>
parents: 11315
diff changeset
200 local final_size = request.body_sink:seek();
11309
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
201 local uploaded, err = errors.coerce(request.body_sink:close());
11316
ae0461b37fbe mod_http_file_share: Verify final file size on completion of upload
Kim Alvefur <zash@zash.se>
parents: 11315
diff changeset
202 if final_size ~= upload_info.filesize then
ae0461b37fbe mod_http_file_share: Verify final file size on completion of upload
Kim Alvefur <zash@zash.se>
parents: 11315
diff changeset
203 -- Could be too short as well, but we say the same thing
ae0461b37fbe mod_http_file_share: Verify final file size on completion of upload
Kim Alvefur <zash@zash.se>
parents: 11315
diff changeset
204 uploaded, err = false, 413;
ae0461b37fbe mod_http_file_share: Verify final file size on completion of upload
Kim Alvefur <zash@zash.se>
parents: 11315
diff changeset
205 end
11309
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
206 if uploaded then
11321
15ab878a7d23 mod_http_file_share: Add some logging
Kim Alvefur <zash@zash.se>
parents: 11320
diff changeset
207 module:log("debug", "Upload of %q completed, %s", filename, B(final_size));
11309
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
208 assert(os.rename(filename.."~", filename));
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
209 return 201;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
210 else
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
211 assert(os.remove(filename.."~"));
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 return err;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
214 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
215
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
216 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
217
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 function handle_download(event, path) -- GET /uploads/:slot+filename
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
219 local request, response = event.request, event.response;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 local slot_id = path:match("^[^/]+");
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
221 -- TODO cache
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
222 local slot, when = errors.coerce(uploads:get(nil, slot_id));
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
223 if not slot then
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
224 module:log("debug", "uploads:get(%q) --> not-found, %s", slot_id, when);
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
225 return 404;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
226 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
227 module:log("debug", "uploads:get(%q) --> %s, %d", slot_id, slot, when);
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
228 local last_modified = os.date('!%a, %d %b %Y %H:%M:%S GMT', when);
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
229 if request.headers.if_modified_since == last_modified then
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
230 return 304;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
231 end
11324
494761f5d7da mod_http_file_share: Use '.bin' file extension
Kim Alvefur <zash@zash.se>
parents: 11323
diff changeset
232 local filename = dm.getpath(slot_id, module.host, module.name, "bin");
11309
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
233 local handle, ferr = errors.coerce(io.open(filename));
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
234 if not handle then
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
235 return ferr or 410;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
236 end
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
237 response.headers.last_modified = last_modified;
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
238 response.headers.content_length = slot.attr.size;
11320
817cadf6be92 mod_http_file_share: Handle content-type being optional
Kim Alvefur <zash@zash.se>
parents: 11319
diff changeset
239 response.headers.content_type = slot.attr["content-type"] or "application/octet-stream";
11309
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
240 response.headers.content_disposition = string.format("attachment; filename=%q", slot.attr.filename);
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
241
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
242 response.headers.cache_control = "max-age=31556952, immutable";
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
243 response.headers.content_security_policy = "default-src 'none'; frame-ancestors 'none';"
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
244
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
245 return response:send_file(handle);
b59aed75dc5e mod_http_file_share: Let's write another XEP-0363 implementation
Kim Alvefur <zash@zash.se>
parents:
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246 -- TODO
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247 -- Set security headers
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248 end
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249
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250 -- TODO periodic cleanup job
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251
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252 module:hook("iq-get/host/urn:xmpp:http:upload:0:request", handle_slot_request);
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253
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254 if not external_base_url then
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255 module:provides("http", {
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256 streaming_uploads = true;
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257 route = {
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258 ["PUT /*"] = handle_upload;
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259 ["GET /*"] = handle_download;
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260 }
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261 });
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262 end