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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");
local filetransfer_manager_ui_url = module:get_option("filetransfer_manager_ui_url");
-- imports
local st = require"util.stanza";
local http = require"socket.http";
local json = require"util.json";
local dataform = require "util.dataforms".new;
local ltn12 = require"ltn12";
-- depends
module:depends("disco");
-- namespace
local xmlns_http_upload = "urn:xmpp:filetransfer:http";
module:add_feature(xmlns_http_upload);
if filetransfer_manager_ui_url then
-- add additional disco info to advertise managing UI
module:add_extension(dataform {
{ name = "FORM_TYPE", type = "hidden", value = xmlns_http_upload },
{ name = "filetransfer-manager-ui-url", type = "text-single" },
}:form({ ["filetransfer-manager-ui-url"] = filetransfer_manager_ui_url }, "result"));
end
local function listfiles(origin, orig_from, stanza, request)
-- build the body
local reqbody = "xmpp_server_key=" .. xmpp_server_key .. "&slot_type=list&user_jid=" .. orig_from;
-- the request
local respbody, statuscode = http.request(external_url, reqbody);
-- respbody is nil in case the server is not reachable
if respbody ~= nil then
respbody = string.gsub(respbody, "\\/", "/");
end
local filelistempty = true;
local list;
-- 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;
elseif errobj["err_code"] ~= nil and errobj["msg"] ~= nil then
if statuscode == 403 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
-- process json response
list = respobj.list;
filelistempty = list == nil or next(list) == nil;
end
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode .. " response: " ..respbody));
return true;
end
local addedfiles = 0;
local reply = st.reply(stanza);
reply:tag("list", {xmlns=xmlns_http_upload});
if filelistempty == false then
for i, file in ipairs(list) do
local url = file.url;
if url == "" then
url = nil;
end
local fileinfo = file.fileinfo;
local sender = file.sender_jid;
if sender == nil then
sender = "";
end
local recipient = file.recipient_jid;
local sent_time = file.sent_time;
-- only add file if fileinfo is present
if fileinfo ~= nil then
addedfiles = addedfiles + 1;
reply:tag("file", {timestamp = tostring(sent_time), from = tostring(sender), to = recipient});
reply:tag("url"):text(url):up();
reply:tag("file-info");
reply:tag("filename"):text(fileinfo.filename):up();
reply:tag("size"):text(fileinfo.filesize):up();
reply:tag("content-type"):text(fileinfo.content_type):up():up():up();
end
end
end
if filelistempty or addedfiles == 0 then
reply:tag("empty"):up();
end
origin.send(reply);
return true;
end
local function deletefile(origin, orig_from, stanza, request)
-- validate
local fileurl = request:get_child_text("fileurl");
if not fileurl or 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 resp = {};
local client, statuscode = http.request{url=fileurl,
sink=ltn12.sink.table(resp),
method="DELETE",
headers={["X-XMPP-SERVER-KEY"]=xmpp_server_key,
["X-USER-JID"]=orig_from}};
local respbody = table.concat(resp);
-- respbody is nil in case the server is not reachable
if respbody ~= nil then
respbody = string.gsub(respbody, "\\/", "/");
end
-- 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 statuscode == 403 and errobj["msg"] ~= nil then
origin.send(st.error_reply(stanza, "cancel", "internal-server-error", errobj.msg));
return true;
elseif 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)
:tag("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
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "msg or err_code not found"));
return true;
end
end
elseif statuscode == 204 or statuscode == 404 then
local reply = st.reply(stanza);
reply:tag("deleted", { xmlns = xmlns_http_upload });
origin.send(reply);
return true;
elseif respbody ~= nil then
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode .. " response: " ..respbody));
return true;
else
-- http file service not reachable
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode));
return true;
end
end
-- 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;
if slot_type then
module:log("debug", "incoming request is of type " .. slot_type);
else
module:log("debug", "incoming request has no type - using default type 'upload'");
end
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 recipient = request.attr.recipient;
if not recipient then
origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing or invalid recipient"));
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 .. "&recipient_jid=" .. recipient;
if content_type then
reqbody = reqbody .. "&content_type=" .. content_type;
end
-- the request
local respbody, statuscode = http.request(external_url, reqbody);
-- respbody is nil in case the server is not reachable
if respbody ~= nil then
respbody = string.gsub(respbody, "\\/", "/");
end
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)
:tag("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)
:tag("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)
:tag("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
elseif respbody ~= nil then
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode .. " response: " ..respbody));
return true;
else
-- http file service not reachable
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode));
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);
return true;
elseif slot_type == "delete" then
return deletefile(origin, orig_from, stanza, request);
elseif slot_type == "list" then
return listfiles(origin, orig_from, stanza, request);
else
origin.send(st.error_reply(stanza, "cancel", "undefined-condition", "status code: " .. statuscode .. " response: " ..respbody));
return true;
end
end);
|
