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%% Copyright (C) 2003 Joakim Grebenö <jocke@gleipnir.com>.
%% All rights reserved.
%%
%% Copyright (C) 2006 Gaspar Chilingarov <nm@web.am>
%% Gurgen Tumanyan <barbarian@armkb.com>
%% All rights reserved.
%%
%%
%% Redistribution and use in source and binary forms, with or without
%% modification, are permitted provided that the following conditions
%% are met:
%%
%% 1. Redistributions of source code must retain the above copyright
%% notice, this list of conditions and the following disclaimer.
%% 2. Redistributions in binary form must reproduce the above
%% copyright notice, this list of conditions and the following
%% disclaimer in the documentation and/or other materials provided
%% with the distribution.
%%
%% THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
%% OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
%% WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
%% ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
%% DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
%% DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
%% GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
%% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
%% WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
%% NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
%% SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-module(yaws_jsonrpc).
-author("Gaspar Chilingarov <nm@web.am>, Gurgen Tumanyan <barbarian@armkb.com>").
-export([handler/2]).
-export([handler_session/2, handler_session/3]).
%-define(debug, 1).
%-include("../../yaws/src/yaws_debug.hrl").
-include("../include/yaws_api.hrl").
%%% ######################################################################
%%% public interface
%%%
%%%
%%% use jsonrpc handler which can automagically start sessions if we need
%%%
handler_session(Args, Handler) ->
handler_session(Args, Handler, 'SID').
%%%
%%% allow overriding session Cookie name
%%%
handler_session(Args, Handler, SID_NAME) when is_atom(SID_NAME) ->
handler_session(Args, Handler, atom_to_list(SID_NAME));
handler_session(Args, Handler, SID_NAME) ->
handler(Args, Handler, {session, SID_NAME}). % go to generic handler
%%%
%%% xmlrpc:handler compatible call
%%% no session support will be available
handler(Args, Handler) ->
handler(Args, Handler, simple).
%%% ######################################################################
%%% private functions
%%%
%%% we should be called from yaws page or module
handler(Args, Handler, Type) when is_record(Args, arg) -> % {{{
case parse_request(Args) of
ok ->
handle_payload(Args, Handler, Type);
{status, StatusCode} -> % cannot parse request
send(Args, StatusCode)
end. % }}}
-define(ERROR_LOG(Reason),
error_logger:error_report({?MODULE, ?LINE, Reason})).
%%%
%%% check that request come in reasonable protocol version and reasonable method
%%%
parse_request(Args) -> % {{{
case {(Args#arg.req)#http_request.method, (Args#arg.req)#http_request.version} of
{'POST', {1,0}} ->
% ?Debug("HTTP Version 1.0~n", []),
ok;
{'POST', {1,1}} ->
% ?Debug("HTTP Version 1.1~n", []),
ok;
{'POST', _HTTPVersion} -> {status, 505};
{_Method, {1,1}} -> {status, 501};
_ -> {status, 400}
end. % }}}
handle_payload(Args, Handler, Type) -> % {{{
Payload = binary_to_list(Args#arg.clidata),
% ?Debug("jsonrpc plaintext call ~p ~n", [Payload]),
case decode_handler_payload(Payload) of
{ok, DecodedPayload, ID} ->
% ?Debug("json2erl decoded call ~p ~n", [DecodedPayload]),
eval_payload(Args, Handler, DecodedPayload, Type, ID);
{error, Reason} ->
?ERROR_LOG({html, json2erl, Payload, Reason}),
send(Args, 400)
end. % }}}
%%%
%%% call handler/3 and provide session support
eval_payload(Args, {M, F}, Payload, {session, CookieName},ID) -> % {{{
{SessionValue, Cookie} = case yaws_api:find_cookie_val(CookieName, (Args#arg.headers)#headers.cookie) of
[] -> % have no session started, just call handler
{undefined, undefined};
Cookie2 -> % get old session data
case yaws_api:cookieval_to_opaque(Cookie2) of
{ok, OP} ->
yaws_api:cookieval_to_opaque(Cookie2),
{OP, Cookie2};
{error, _ErrMsg} -> % cannot get corresponding session
{undefined, undefined}
end
end,
case catch M:F(Args#arg.state, Payload, SessionValue) of
{'EXIT', Reason} ->
?ERROR_LOG({M, F, {'EXIT', Reason}}),
send(Args, 500);
{error, Reason} ->
?ERROR_LOG({M, F, Reason}),
send(Args, 500);
{false, ResponsePayload} ->
% do not have updates in session data
encode_send(Args, 200, ResponsePayload, [], ID);
{true, _NewTimeout, NewSessionValue, ResponsePayload} -> % be compatible with xmlrpc module
CO = case NewSessionValue of
undefined when Cookie == undefined -> []; % nothing to do
undefined -> % rpc handler requested session delete
yaws_api:delete_cookie_session(Cookie), []; % XXX: may be return set-cookie with empty val?
_ -> % any other value will stored in session
case SessionValue of
undefined -> % got session data and should start new session now
Cookie1 = yaws_api:new_cookie_session(NewSessionValue),
yaws_api:setcookie(CookieName, Cookie1, "/"); % return set_cookie header
_ ->
yaws_api:replace_cookie_session(Cookie, NewSessionValue),
[] % nothing to add to yaws data
end
end,
encode_send(Args, 200, ResponsePayload, CO, ID)
end; % }}}
%%%
%%% call handler/2 without session support
%%%
eval_payload(Args, {M, F}, Payload, simple, ID) -> % {{{
case catch M:F(Args#arg.state, Payload) of
{'EXIT', Reason} ->
?ERROR_LOG({M, F, {'EXIT', Reason}}),
send(Args, 500);
{error, Reason} ->
?ERROR_LOG({M, F, Reason}),
send(Args, 500);
{false, ResponsePayload} ->
encode_send(Args, 200, ResponsePayload, [],ID);
{true, _NewTimeout, _NewState, ResponsePayload} ->
encode_send(Args, 200, ResponsePayload, [],ID)
end. % }}}
%%% XXX compatibility with XMLRPC handlers
%%% XXX - potential bug here?
encode_send(Args, StatusCode, [Payload], AddOn, ID) -> % {{{
encode_send(Args, StatusCode, Payload, AddOn, ID); % }}}
encode_send(Args, StatusCode, Payload, AddOn, ID) -> % {{{
% ?Debug("jsonrpc response ~p ~n", [Payload]),
case encode_handler_payload(Payload, ID) of
{ok, EncodedPayload} ->
% ?Debug("jsonpc encoded response ~p ~n", [EncodedPayload]),
send(Args, StatusCode, EncodedPayload, AddOn);
{error, Reason} ->
?ERROR_LOG({jsonrpc_encode, payload, Payload, Reason}),
send(Args, 500)
end. % }}}
send(Args, StatusCode) -> send(Args, StatusCode, "", []). % {{{
send(Args, StatusCode, Payload, AddOnData) when not is_list(AddOnData) ->
send(Args, StatusCode, Payload, [AddOnData]);
send(_Args, StatusCode, Payload, AddOnData) ->
A = [
{status, StatusCode},
{content, "text/xml", Payload},
{header, {content_length, lists:flatlength(Payload) }}
] ++ AddOnData,
A
. % }}}
encode_handler_payload({response, [ErlStruct]},ID) -> % {{{
encode_handler_payload({response, ErlStruct}, ID);
encode_handler_payload({response, ErlStruct},ID) ->
StructStr = json:encode({struct, [ {result, ErlStruct}, {id, ID}]}),
{ok, StructStr}. % }}}
decode_handler_payload(JSonStr) -> %{{{
try
{ok, JSON} = json:decode_string(JSonStr),
Method = list_to_atom(jsonrpc:s(JSON, method)),
{array, Args} = jsonrpc:s(JSON, params),
ID = jsonrpc:s(JSON, id),
{ok, {call, Method, Args}, ID}
catch
error:Err -> {error, Err}
end.%}}}
% vim: tabstop=4 ft=erlang
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