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% Licensed under the Apache License, Version 2.0 (the "License"); you may not
% use this file except in compliance with the License. You may obtain a copy of
% the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
% License for the specific language governing permissions and limitations under
% the License.
-module(couch_httpd_external).
-export([handle_external_req/2, handle_external_req/3]).
-export([send_external_response/2, json_req_obj/2, json_req_obj/3]).
-export([default_or_content_type/2, parse_external_response/1]).
-import(couch_httpd,[send_error/4]).
-include("couch_db.hrl").
% handle_external_req/2
% for the old type of config usage:
% _external = {couch_httpd_external, handle_external_req}
% with urls like
% /db/_external/action/design/name
handle_external_req(#httpd{
path_parts=[_DbName, _External, UrlName | _Path]
}=HttpReq, Db) ->
process_external_req(HttpReq, Db, UrlName);
handle_external_req(#httpd{path_parts=[_, _]}=Req, _Db) ->
send_error(Req, 404, <<"external_server_error">>, <<"No server name specified.">>);
handle_external_req(Req, _) ->
send_error(Req, 404, <<"external_server_error">>, <<"Broken assumption">>).
% handle_external_req/3
% for this type of config usage:
% _action = {couch_httpd_external, handle_external_req, <<"action">>}
% with urls like
% /db/_action/design/name
handle_external_req(HttpReq, Db, Name) ->
process_external_req(HttpReq, Db, Name).
process_external_req(HttpReq, Db, Name) ->
Response = couch_external_manager:execute(binary_to_list(Name),
json_req_obj(HttpReq, Db)),
case Response of
{unknown_external_server, Msg} ->
send_error(HttpReq, 404, <<"external_server_error">>, Msg);
_ ->
send_external_response(HttpReq, Response)
end.
json_req_obj(Req, Db) -> json_req_obj(Req, Db, null).
json_req_obj(#httpd{mochi_req=Req,
method=Method,
requested_path_parts=RequestedPath,
path_parts=Path,
req_body=ReqBody
}, Db, DocId) ->
Body = case ReqBody of
undefined -> Req:recv_body();
Else -> Else
end,
ParsedForm = case Req:get_primary_header_value("content-type") of
"application/x-www-form-urlencoded" ++ _ ->
case Body of
undefined -> [];
_ -> mochiweb_util:parse_qs(Body)
end;
_ ->
[]
end,
Headers = Req:get(headers),
Hlist = mochiweb_headers:to_list(Headers),
{ok, Info} = couch_db:get_db_info(Db),
% add headers...
{[{<<"info">>, {Info}},
{<<"id">>, DocId},
{<<"uuid">>, couch_uuids:new()},
{<<"method">>, Method},
{<<"requested_path">>, RequestedPath},
{<<"path">>, Path},
{<<"query">>, json_query_keys(to_json_terms(Req:parse_qs()))},
{<<"headers">>, to_json_terms(Hlist)},
{<<"body">>, Body},
{<<"peer">>, ?l2b(Req:get(peer))},
{<<"form">>, to_json_terms(ParsedForm)},
{<<"cookie">>, to_json_terms(Req:parse_cookie())},
{<<"userCtx">>, couch_util:json_user_ctx(Db)},
{<<"secObj">>, couch_db:get_security(Db)}]}.
to_json_terms(Data) ->
to_json_terms(Data, []).
to_json_terms([], Acc) ->
{lists:reverse(Acc)};
to_json_terms([{Key, Value} | Rest], Acc) when is_atom(Key) ->
to_json_terms(Rest, [{list_to_binary(atom_to_list(Key)), list_to_binary(Value)} | Acc]);
to_json_terms([{Key, Value} | Rest], Acc) ->
to_json_terms(Rest, [{list_to_binary(Key), list_to_binary(Value)} | Acc]).
json_query_keys({Json}) ->
json_query_keys(Json, []).
json_query_keys([], Acc) ->
{lists:reverse(Acc)};
json_query_keys([{<<"startkey">>, Value} | Rest], Acc) ->
json_query_keys(Rest, [{<<"startkey">>, couch_util:json_decode(Value)}|Acc]);
json_query_keys([{<<"endkey">>, Value} | Rest], Acc) ->
json_query_keys(Rest, [{<<"endkey">>, couch_util:json_decode(Value)}|Acc]);
json_query_keys([{<<"key">>, Value} | Rest], Acc) ->
json_query_keys(Rest, [{<<"key">>, couch_util:json_decode(Value)}|Acc]);
json_query_keys([Term | Rest], Acc) ->
json_query_keys(Rest, [Term|Acc]).
send_external_response(Req, Response) ->
#extern_resp_args{
code = Code,
data = Data,
ctype = CType,
headers = Headers,
json = Json
} = parse_external_response(Response),
Headers1 = default_or_content_type(CType, Headers),
case Json of
nil ->
couch_httpd:send_response(Req, Code, Headers1, Data);
Json ->
couch_httpd:send_json(Req, Code, Headers1, Json)
end.
parse_external_response({Response}) ->
lists:foldl(fun({Key,Value}, Args) ->
case {Key, Value} of
{"", _} ->
Args;
{<<"code">>, Value} ->
Args#extern_resp_args{code=Value};
{<<"stop">>, true} ->
Args#extern_resp_args{stop=true};
{<<"json">>, Value} ->
Args#extern_resp_args{
json=Value,
ctype="application/json"};
{<<"body">>, Value} ->
Args#extern_resp_args{data=Value, ctype="text/html; charset=utf-8"};
{<<"base64">>, Value} ->
Args#extern_resp_args{
data=base64:decode(Value),
ctype="application/binary"
};
{<<"headers">>, {Headers}} ->
NewHeaders = lists:map(fun({Header, HVal}) ->
{binary_to_list(Header), binary_to_list(HVal)}
end, Headers),
Args#extern_resp_args{headers=NewHeaders};
_ -> % unknown key
Msg = lists:flatten(io_lib:format("Invalid data from external server: ~p", [{Key, Value}])),
throw({external_response_error, Msg})
end
end, #extern_resp_args{}, Response).
default_or_content_type(DefaultContentType, Headers) ->
IsContentType = fun({X, _}) -> string:to_lower(X) == "content-type" end,
case lists:any(IsContentType, Headers) of
false ->
[{"Content-Type", DefaultContentType} | Headers];
true ->
Headers
end.
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