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-- 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);
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