1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
-- mod_http_upload_external
--
-- Copyright (C) 2016 Sebastian Luksch
--
-- This file is MIT/X11 licensed.
--
-- Implementation of HTTP Upload file transfer mechanism used by Conversations
--
-- Query external HTTP server to retrieve URLs
--
-- configuration
local external_url = module:get_option("http_upload_external_url");
local xmpp_server_key = module:get_option("http_upload_external_server_key");
-- imports
local st = require"util.stanza";
local http = require"socket.http";
local json = require"util.json";
-- depends
module:depends("disco");
-- namespace
local xmlns_http_upload = "urn:xmpp:filetransfer:http";
module:add_feature(xmlns_http_upload);
-- hooks
module:hook("iq/host/"..xmlns_http_upload..":request", function (event)
local stanza, origin = event.stanza, event.origin;
local orig_from = stanza.attr.from;
local request = stanza.tags[1];
-- local clients only
if origin.type ~= "c2s" then
origin.send(st.error_reply(stanza, "cancel", "not-authorized"));
return true;
end
-- check configuration
if not external_url or not xmpp_server_key then
module:log("debug", "missing configuration options: http_upload_external_url and/or http_upload_external_server_key");
origin.send(st.error_reply(stanza, "cancel", "internal-server-error"));
return true;
end
local slot_type = request.attr.type;
module:log("debug", "incoming request is of type " .. slot_type);
if not slot_type or slot_type == "upload" then
-- validate
local filename = request:get_child_text("filename");
if not filename then
origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid filename"));
return true;
end
local filesize = tonumber(request:get_child_text("size"));
if not filesize then
origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing or invalid file size"));
return true;
end
local content_type = request:get_child_text("content-type");
-- build the body
local reqbody = "xmpp_server_key=" .. xmpp_server_key .. "&slot_type=upload&size=" .. filesize .. "&filename=" .. filename .. "&user_jid=" .. orig_from;
if content_type then
reqbody = reqbody .. "&content_type=" .. content_type;
end
-- the request
local respbody, statuscode = http.request(external_url, reqbody);
respbody = string.gsub(respbody, "\\/", "/")
local get_url = nil;
local put_url = nil;
-- check the response
if statuscode == 500 then
origin.send(st.error_reply(stanza, "cancel", "service-unavailable", respbody));
return true;
elseif statuscode == 406 or statuscode == 400 or statuscode == 403 then
local errobj, pos, err = json.decode(respbody);
if err then
origin.send(st.error_reply(stanza, "wait", "internal-server-error", err));
return true;
else
if errobj["err_code"] ~= nil and errobj["msg"] ~= nil then
if errobj.err_code == 1 then
origin.send(st.error_reply(stanza, "modify", "not-acceptable", errobj.msg));
return true;
elseif errobj.err_code == 2 then
origin.send(st.error_reply(stanza, "modify", "not-acceptable", errobj.msg,
st.stanza("file-too-large", {xmlns=xmlns_http_upload})
:tag("max-size"):text(errobj.parameters.max_file_size)));
return true;
elseif errobj.err_code == 3 then
origin.send(st.error_reply(stanza, "modify", "not-acceptable", errobj.msg,
st.stanza("invalid-character", {xmlns=xmlns_http_upload})
:text(errobj.parameters.invalid_character)));
return true;
elseif errobj.err_code == 4 then
origin.send(st.error_reply(stanza, "cancel", "internal-server-error", errobj.msg,
st.stanza("missing-parameter", {xmlns=xmlns_http_upload})
:text(errobj.parameters.missing_parameter)));
return true;
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "unknown err_code"));
return true;
end
elseif statuscode == 403 and errobj["msg"] ~= nil then
origin.send(st.error_reply(stanza, "cancel", "internal-server-error", errobj.msg));
return true;
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "msg or err_code not found"));
return true;
end
end
elseif statuscode == 200 then
local respobj, pos, err = json.decode(respbody);
if err then
origin.send(st.error_reply(stanza, "wait", "internal-server-error", err));
return true;
else
if respobj["get"] ~= nil and respobj["put"] ~= nil then
get_url = respobj.get;
put_url = respobj.put;
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "get or put not found"));
return true;
end
end
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode .. " response: " ..respbody));
return true;
end
local reply = st.reply(stanza);
reply:tag("slot", { xmlns = xmlns_http_upload });
reply:tag("get"):text(get_url):up();
reply:tag("put"):text(put_url):up();
origin.send(reply);
elseif slot_type == "delete" then
-- validate
local fileurl = request:get_child_text("fileurl");
if not fileurl then
origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid fileurl"));
return true;
end
-- build the body
local reqbody = "xmpp_server_key=" .. xmpp_server_key .. "slot_type=delete&file_url=" .. fileurl .. "&user_jid=" .. orig_from;
-- the request
local respbody, statuscode = http.request(external_url, reqbody);
respbody = string.gsub(respbody, "\\/", "/")
local delete_token = nil;
-- check the response
if statuscode == 500 then
origin.send(st.error_reply(stanza, "cancel", "service-unavailable", respbody));
return true;
elseif statuscode == 406 or statuscode == 400 or statuscode == 403 then
local errobj, pos, err = json.decode(respbody);
if err then
origin.send(st.error_reply(stanza, "wait", "internal-server-error", err));
return true;
else
if errobj["err_code"] ~= nil and errobj["msg"] ~= nil then
if errobj.err_code == 4 then
origin.send(st.error_reply(stanza, "cancel", "internal-server-error", errobj.msg,
st.stanza("missing-parameter", {xmlns=xmlns_http_upload})
:text(errobj.parameters.missing_parameter)));
return true;
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "unknown err_code"));
return true;
end
elseif statuscode == 403 and errobj["msg"] ~= nil then
origin.send(st.error_reply(stanza, "cancel", "internal-server-error", errobj.msg));
return true;
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "msg or err_code not found"));
return true;
end
end
elseif statuscode == 200 then
local respobj, pos, err = json.decode(respbody);
if err then
origin.send(st.error_reply(stanza, "wait", "internal-server-error", err));
return true;
else
if respobj["deletetoken"] ~= nil then
delete_token = respobj.deletetoken;
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "deletetoken not found"));
return true;
end
end
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode .. " response: " ..respbody));
return true;
end
local reply = st.reply(stanza);
reply:tag("slot", { xmlns = xmlns_http_upload });
reply:tag("deletetoken"):text(delete_token):up();
origin.send(reply);
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode .. " response: " ..respbody));
return true;
end
return true;
end);
|
