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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(chttpd_show).
-export([handle_doc_update_req/3]).
-include_lib("couch/include/couch_db.hrl").
-include_lib("couch_views/include/couch_views.hrl").
maybe_open_doc(Db, DocId, Options) ->
case fabric:open_doc(Db, DocId, Options) of
{ok, Doc} ->
chttpd_stats:incr_reads(),
Doc;
{not_found, _} ->
nil
end.
% /db/_design/foo/update/bar/docid
% updates a doc based on a request
% handle_doc_update_req(#httpd{method = 'GET'}=Req, _Db, _DDoc) ->
% % anything but GET
% send_method_not_allowed(Req, "POST,PUT,DELETE,ETC");
handle_doc_update_req(#httpd{
path_parts=[_, _, _, _, UpdateName]
}=Req, Db, DDoc) ->
send_doc_update_response(Req, Db, DDoc, UpdateName, nil, null);
handle_doc_update_req(#httpd{
path_parts=[_, _, _, _, UpdateName | DocIdParts]
}=Req, Db, DDoc) ->
DocId = ?l2b(string:join([?b2l(P) || P <- DocIdParts], "/")),
Options = [conflicts, {user_ctx, Req#httpd.user_ctx}],
Doc = maybe_open_doc(Db, DocId, Options),
send_doc_update_response(Req, Db, DDoc, UpdateName, Doc, DocId);
handle_doc_update_req(Req, _Db, _DDoc) ->
chttpd:send_error(Req, 404, <<"update_error">>, <<"Invalid path.">>).
send_doc_update_response(Req, Db, DDoc, UpdateName, Doc, DocId) ->
%% Will throw an exception if the _update handler is missing
couch_util:get_nested_json_value(DDoc#doc.body, [<<"updates">>, UpdateName]),
JsonReq = chttpd_external:json_req_obj(Req, Db, DocId),
JsonDoc = couch_query_servers:json_doc(Doc),
Cmd = [<<"updates">>, UpdateName],
UpdateResp = couch_query_servers:ddoc_prompt(DDoc, Cmd, [JsonDoc, JsonReq]),
JsonResp = case UpdateResp of
[<<"up">>, {NewJsonDoc}, {JsonResp0}] ->
case chttpd:header_value(Req, "X-Couch-Full-Commit", "false") of
"true" ->
Options = [full_commit, {user_ctx, Req#httpd.user_ctx}];
_ ->
Options = [{user_ctx, Req#httpd.user_ctx}]
end,
NewDoc = couch_db:doc_from_json_obj_validate(Db, {NewJsonDoc}),
fabric2_db:validate_docid(NewDoc#doc.id),
{UpdateResult, NewRev} = fabric:update_doc(Db, NewDoc, Options),
chttpd_stats:incr_writes(),
NewRevStr = couch_doc:rev_to_str(NewRev),
case {UpdateResult, NewRev} of
{ok, _} ->
Code = 201;
{accepted, _} ->
Code = 202
end,
{JsonResp1} = apply_headers(JsonResp0, [
{<<"X-Couch-Update-NewRev">>, NewRevStr},
{<<"X-Couch-Id">>, couch_util:url_encode(NewDoc#doc.id)}
]),
{[{<<"code">>, Code} | JsonResp1]};
[<<"up">>, _Other, {JsonResp0}] ->
{[{<<"code">>, 200} | JsonResp0]}
end,
% todo set location field
chttpd_external:send_external_response(Req, JsonResp).
% Maybe this is in the proplists API
% todo move to couch_util
json_apply_field(H, {L}) ->
json_apply_field(H, L, []).
json_apply_field({Key, NewValue}, [{Key, _OldVal} | Headers], Acc) ->
% drop matching keys
json_apply_field({Key, NewValue}, Headers, Acc);
json_apply_field({Key, NewValue}, [{OtherKey, OtherVal} | Headers], Acc) ->
% something else is next, leave it alone.
json_apply_field({Key, NewValue}, Headers, [{OtherKey, OtherVal} | Acc]);
json_apply_field({Key, NewValue}, [], Acc) ->
% end of list, add ours
{[{Key, NewValue}|Acc]}.
apply_etag(JsonResp, undefined) ->
JsonResp;
apply_etag({ExternalResponse}, CurrentEtag) ->
% Here we embark on the delicate task of replacing or creating the
% headers on the JsonResponse object. We need to control the Etag and
% Vary headers. If the external function controls the Etag, we'd have to
% run it to check for a match, which sort of defeats the purpose.
apply_headers(ExternalResponse, [
{<<"ETag">>, CurrentEtag},
{<<"Vary">>, <<"Accept">>}
]).
apply_headers(JsonResp, []) ->
JsonResp;
apply_headers(JsonResp, NewHeaders) ->
case couch_util:get_value(<<"headers">>, JsonResp) of
undefined ->
{[{<<"headers">>, {NewHeaders}}| JsonResp]};
JsonHeaders ->
Headers = apply_headers1(JsonHeaders, NewHeaders),
NewKV = {<<"headers">>, Headers},
{lists:keyreplace(<<"headers">>, 1, JsonResp, NewKV)}
end.
apply_headers1(JsonHeaders, [{Key, Value} | Rest]) ->
NewJsonHeaders = json_apply_field({Key, Value}, JsonHeaders),
apply_headers1(NewJsonHeaders, Rest);
apply_headers1(JsonHeaders, []) ->
JsonHeaders.
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