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%%============================================================================== |
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%% Copyright 2014 Erlang Solutions Ltd. |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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%%============================================================================== |
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-module(mongoose_api_json). |
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-behaviour(mongoose_api_format). |
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%% mongoose_api_format callbacks |
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-export([serialize/1, |
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deserialize/1]). |
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%%-------------------------------------------------------------------- |
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%% mongoose_api_format callbacks |
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%%-------------------------------------------------------------------- |
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deserialize(Json) -> |
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try jiffy:decode(Json, [return_maps]) of |
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Data -> |
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{ok, do_deserialize(Data)} |
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catch _:_ -> |
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1 |
{error, unprocessable} |
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end. |
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serialize(Data) -> |
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do_serialize(Data). |
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%%-------------------------------------------------------------------- |
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%% internal functions |
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%%-------------------------------------------------------------------- |
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do_deserialize(#{} = Map) -> |
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maps:to_list(maps:map(fun(_K, V) -> do_deserialize(V) end, Map)); |
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do_deserialize(NotAMap) -> |
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NotAMap. |
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do_serialize(Data) -> |
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jiffy:encode(prepare_struct(Data)). |
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prepare_struct({Key, Value}) -> |
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#{prepare_key(Key) => prepare_struct(Value)}; |
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prepare_struct([]) -> |
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[]; |
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prepare_struct(List) when is_list(List) -> |
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34164 |
case is_proplist(List) of |
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true -> |
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maps:from_list([{prepare_key(K), prepare_struct(V)} || {K, V} <- List]); |
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false -> |
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[prepare_struct(Element) || Element <- List] |
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end; |
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prepare_struct(List) when is_list(List) -> |
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:-( |
try unicode:characters_to_binary(List) of |
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Bin when is_binary(Bin) -> Bin; |
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_ -> List %% Items in List are not valid unicode codepoints |
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catch |
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error:badarg -> List %% List is not a list of characters |
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end; |
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prepare_struct(Other) -> |
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Other. |
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prepare_key(Key) when is_integer(Key) -> |
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integer_to_binary(Key); |
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prepare_key(Key) when is_list(Key); is_binary(Key) -> |
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case unicode:characters_to_binary(Key) of |
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Bin when is_binary(Bin) -> Bin |
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end; |
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prepare_key(Key) -> |
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Key. |
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is_proplist(List) -> |
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is_proplist(List, sets:new()). |
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is_proplist([], _Keys) -> |
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true; |
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is_proplist([{Key, _} | Tail], Keys) -> |
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case sets:is_element(Key, Keys) of |
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true -> |
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false; |
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false -> |
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is_proplist(Tail, sets:add_element(Key, Keys)) |
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end; |
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is_proplist(_Other, _Keys) -> |
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false. |