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erlang-server.handler.mustache Maven / Gradle / Ivy
%% basic handler
-module({{classname}}).
%% Cowboy REST callbacks
-export([allowed_methods/2]).
-export([init/2]).
-export([allow_missing_post/2]).
-export([content_types_accepted/2]).
-export([content_types_provided/2]).
-export([delete_resource/2]).
-export([is_authorized/2]).
-export([known_content_type/2]).
-export([malformed_request/2]).
-export([valid_content_headers/2]).
-export([valid_entity_length/2]).
%% Handlers
-export([handle_request_json/2]).
-record(state, {
operation_id :: {{packageName}}_api:operation_id(),
logic_handler :: atom(),
validator_state :: jesse_state:state(),
context=#{} :: #{}
}).
-type state() :: state().
-spec init(Req :: cowboy_req:req(), Opts :: {{packageName}}_router:init_opts()) ->
{cowboy_rest, Req :: cowboy_req:req(), State :: state()}.
init(Req, {Operations, LogicHandler, ValidatorMod}) ->
Method = cowboy_req:method(Req),
OperationID = maps:get(Method, Operations, undefined),
ValidatorState = ValidatorMod:get_validator_state(),
error_logger:info_msg("Attempt to process operation: ~p", [OperationID]),
State = #state{
operation_id = OperationID,
logic_handler = LogicHandler,
validator_state = ValidatorState
},
{cowboy_rest, Req, State}.
-spec allowed_methods(Req :: cowboy_req:req(), State :: state()) ->
{Value :: [binary()], Req :: cowboy_req:req(), State :: state()}.
{{#operations}}{{#operation}}
allowed_methods(
Req,
State = #state{
operation_id = '{{operationId}}'
}
) ->
{[<<"{{httpMethod}}">>], Req, State};
{{/operation}}{{/operations}}
allowed_methods(Req, State) ->
{[], Req, State}.
-spec is_authorized(Req :: cowboy_req:req(), State :: state()) ->
{
Value :: true | {false, AuthHeader :: iodata()},
Req :: cowboy_req:req(),
State :: state()
}.
{{#operations}}
{{#operation}}
{{#authMethods}}
is_authorized(
Req0,
State = #state{
operation_id = '{{operationId}}' = OperationID,
logic_handler = LogicHandler
}
) ->
{{#isApiKey}}
From = {{#isKeyInQuery}}qs_val{{/isKeyInQuery}}{{#isKeyInHeader}}header{{/isKeyInHeader}},
Result = {{packageName}}_auth:authorize_api_key(
LogicHandler,
OperationID,
From,
"{{keyParamName}}",
Req0
),
case Result of
{true, Context, Req} -> {true, Req, State#state{context = Context}};
{false, AuthHeader, Req} -> {{false, AuthHeader}, Req, State}
end;
{{/isApiKey}}
{{#isOAuth}}
From = header,
Result = {{packageName}}_auth:authorize_api_key(
LogicHandler,
OperationID,
From,
"Authorization",
Req0
),
case Result of
{true, Context, Req} -> {true, Req, State#state{context = Context}};
{false, AuthHeader, Req} -> {{false, AuthHeader}, Req, State}
end;
{{/isOAuth}}
{{/authMethods}}
{{/operation}}
{{/operations}}
{{^authMethods}}
is_authorized(Req, State) ->
{true, Req, State}.
{{/authMethods}}
{{#authMethods}}
is_authorized(Req, State) ->
{{false, <<"">>}, Req, State}.
{{/authMethods}}
-spec content_types_accepted(Req :: cowboy_req:req(), State :: state()) ->
{
Value :: [{binary(), AcceptResource :: atom()}],
Req :: cowboy_req:req(),
State :: state()
}.
content_types_accepted(Req, State) ->
{[
{<<"application/json">>, handle_request_json}
], Req, State}.
-spec valid_content_headers(Req :: cowboy_req:req(), State :: state()) ->
{Value :: boolean(), Req :: cowboy_req:req(), State :: state()}.
{{#operations}}{{#operation}}
valid_content_headers(
Req0,
State = #state{
operation_id = '{{operationId}}'
}
) ->
Headers = [{{#headerParams}}"{{baseName}}"{{^-last}},{{/-last}}{{/headerParams}}],
{Result, Req} = validate_headers(Headers, Req0),
{Result, Req, State};
{{/operation}}{{/operations}}
valid_content_headers(Req, State) ->
{false, Req, State}.
-spec content_types_provided(Req :: cowboy_req:req(), State :: state()) ->
{
Value :: [{binary(), ProvideResource :: atom()}],
Req :: cowboy_req:req(),
State :: state()
}.
content_types_provided(Req, State) ->
{[
{<<"application/json">>, handle_request_json}
], Req, State}.
-spec malformed_request(Req :: cowboy_req:req(), State :: state()) ->
{Value :: false, Req :: cowboy_req:req(), State :: state()}.
malformed_request(Req, State) ->
{false, Req, State}.
-spec allow_missing_post(Req :: cowboy_req:req(), State :: state()) ->
{Value :: false, Req :: cowboy_req:req(), State :: state()}.
allow_missing_post(Req, State) ->
{false, Req, State}.
-spec delete_resource(Req :: cowboy_req:req(), State :: state()) ->
processed_response().
delete_resource(Req, State) ->
handle_request_json(Req, State).
-spec known_content_type(Req :: cowboy_req:req(), State :: state()) ->
{Value :: true, Req :: cowboy_req:req(), State :: state()}.
known_content_type(Req, State) ->
{true, Req, State}.
-spec valid_entity_length(Req :: cowboy_req:req(), State :: state()) ->
{Value :: true, Req :: cowboy_req:req(), State :: state()}.
valid_entity_length(Req, State) ->
%% @TODO check the length
{true, Req, State}.
%%%%
-type result_ok() :: {
ok,
{Status :: cowboy:http_status(), Headers :: cowboy:http_headers(), Body :: iodata()}
}.
-type result_error() :: {error, Reason :: any()}.
-type processed_response() :: {stop, cowboy_req:req(), state()}.
-spec process_response(result_ok() | result_error(), cowboy_req:req(), state()) ->
processed_response().
process_response(Response, Req0, State = #state{operation_id = OperationID}) ->
case Response of
{ok, {Code, Headers, Body}} ->
Req = cowboy_req:reply(Code, Headers, Body, Req0),
{stop, Req, State};
{error, Message} ->
error_logger:error_msg("Unable to process request for ~p: ~p", [OperationID, Message]),
Req = cowboy_req:reply(400, Req0),
{stop, Req, State}
end.
-spec handle_request_json(cowboy_req:req(), state()) -> processed_response().
handle_request_json(
Req0,
State = #state{
operation_id = OperationID,
logic_handler = LogicHandler,
validator_state = ValidatorState
}
) ->
case {{packageName}}_api:populate_request(OperationID, Req0, ValidatorState) of
{ok, Populated, Req1} ->
{Code, Headers, Body} = {{packageName}}_logic_handler:handle_request(
LogicHandler,
OperationID,
Req1,
maps:merge(State#state.context, Populated)
),
_ = {{packageName}}_api:validate_response(
OperationID,
Code,
Body,
ValidatorState
),
PreparedBody = prepare_body(Code, Body),
Response = {ok, {Code, Headers, PreparedBody}},
process_response(Response, Req1, State);
{error, Reason, Req1} ->
process_response({error, Reason}, Req1, State)
end.
validate_headers(_, Req) -> {true, Req}.
prepare_body(204, Body) when map_size(Body) == 0; length(Body) == 0 ->
<<>>;
prepare_body(304, Body) when map_size(Body) == 0; length(Body) == 0 ->
<<>>;
prepare_body(_Code, Body) ->
jsx:encode(Body).
