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erlang-server.api.mustache Maven / Gradle / Ivy
-module({{packageName}}_api).
-export([request_params/1]).
-export([request_param_info/2]).
-export([populate_request/3]).
-export([validate_response/4]).
%% exported to silence swagger complains
-export([get_value/3, validate_response_body/4]).
-type operation_id() :: atom().
-type request_param() :: atom().
-export_type([operation_id/0]).
-spec request_params(OperationID :: operation_id()) -> [Param :: request_param()].
{{#apiInfo}}{{#apis}}
{{#operations}}{{#operation}}
request_params('{{operationId}}') ->
[{{#allParams}}{{^isBodyParam}}
'{{baseName}}'{{/isBodyParam}}{{#isBodyParam}}
'{{dataType}}'{{/isBodyParam}}{{#hasMore}},{{/hasMore}}{{/allParams}}
];
{{/operation}}{{/operations}}{{/apis}}{{/apiInfo}}
request_params(_) ->
error(unknown_operation).
-type rule() ::
{type, 'binary'} |
{type, 'integer'} |
{type, 'float'} |
{type, 'binary'} |
{type, 'boolean'} |
{type, 'date'} |
{type, 'datetime'} |
{enum, [atom()]} |
{max, Max :: number()} |
{exclusive_max, Max :: number()} |
{min, Min :: number()} |
{exclusive_min, Min :: number()} |
{max_length, MaxLength :: integer()} |
{min_length, MaxLength :: integer()} |
{pattern, Pattern :: string()} |
schema |
required |
not_required.
-spec request_param_info(OperationID :: operation_id(), Name :: request_param()) -> #{
source => qs_val | binding | header | body,
rules => [rule()]
}.
{{#apiInfo}}{{#apis}}
{{#operations}}{{#operation}}{{#allParams}}
request_param_info('{{operationId}}', {{^isBodyParam}}'{{baseName}}'{{/isBodyParam}}{{#isBodyParam}}'{{dataType}}'{{/isBodyParam}}) ->
#{
source => {{#isQueryParam}}qs_val{{/isQueryParam}} {{#isPathParam}}binding{{/isPathParam}} {{#isHeaderParam}}header{{/isHeaderParam}}{{#isBodyParam}}body{{/isBodyParam}},
rules => [{{#isString}}
{type, 'binary'},{{/isString}}{{#isInteger}}
{type, 'integer'},{{/isInteger}}{{#isLong}}
{type, 'integer'},{{/isLong}}{{#isFloat}}
{type, 'float'},{{/isFloat}}{{#isDouble}}
{type, 'float'},{{/isDouble}}{{#isByteArray}}
{type, 'binary'},{{/isByteArray}}{{#isBinary}}
{type, 'binary'},{{/isBinary}}{{#isBoolean}}
{type, 'boolean'},{{/isBoolean}}{{#isDate}}
{type, 'date'},{{/isDate}}{{#isDateTime}}
{type, 'datetime'},{{/isDateTime}}{{#isEnum}}
{enum, [{{#allowableValues}}{{#values}}'{{.}}'{{^-last}}, {{/-last}}{{/values}}{{/allowableValues}}] },{{/isEnum}}{{#maximum}}
{max, {{maximum}} }, {{/maximum}}{{#exclusiveMaximum}}
{exclusive_max, {{exclusiveMaximum}} },{{/exclusiveMaximum}}{{#minimum}}
{min, {{minimum}} },{{/minimum}}{{#exclusiveMinimum}}
{exclusive_min, {{exclusiveMinimum}} },{{/exclusiveMinimum}}{{#maxLength}}
{max_length, {{maxLength}} },{{/maxLength}}{{#minLength}}
{min_length, {{minLength}} },{{/minLength}}{{#pattern}}
{pattern, "{{{pattern}}}" },{{/pattern}}{{#isBodyParam}}
schema,{{/isBodyParam}}{{#required}}
required{{/required}}{{^required}}
not_required{{/required}}
]
};
{{/allParams}}{{/operation}}{{/operations}}{{/apis}}{{/apiInfo}}
request_param_info(OperationID, Name) ->
error({unknown_param, OperationID, Name}).
-spec populate_request(
OperationID :: operation_id(),
Req :: cowboy_req:req(),
ValidatorState :: jesse_state:state()
) ->
{ok, Model :: #{}, Req :: cowboy_req:req()} |
{error, Reason :: any(), Req :: cowboy_req:req()}.
populate_request(OperationID, Req, ValidatorState) ->
Params = request_params(OperationID),
populate_request_params(OperationID, Params, Req, ValidatorState, #{}).
populate_request_params(_, [], Req, _, Model) ->
{ok, Model, Req};
populate_request_params(OperationID, [FieldParams | T], Req0, ValidatorState, Model) ->
case populate_request_param(OperationID, FieldParams, Req0, ValidatorState) of
{ok, K, V, Req} ->
populate_request_params(OperationID, T, Req, ValidatorState, maps:put(K, V, Model));
Error ->
Error
end.
populate_request_param(OperationID, Name, Req0, ValidatorState) ->
#{rules := Rules, source := Source} = request_param_info(OperationID, Name),
case get_value(Source, Name, Req0) of
{error, Reason, Req} ->
{error, Reason, Req};
{Value, Req} ->
case prepare_param(Rules, Name, Value, ValidatorState) of
{ok, Result} -> {ok, Name, Result, Req};
{error, Reason} ->
{error, Reason, Req}
end
end.
-spec validate_response(
OperationID :: operation_id(),
Code :: 200..599,
Body :: jesse:json_term(),
ValidatorState :: jesse_state:state()
) -> ok | no_return().
{{#apiInfo}}{{#apis}}
{{#operations}}{{#operation}}
{{#responses}}
validate_response('{{operationId}}', {{code}}, Body, ValidatorState) ->
validate_response_body('{{dataType}}', '{{baseType}}', Body, ValidatorState);
{{/responses}}
{{/operation}}{{/operations}}{{/apis}}{{/apiInfo}}
validate_response(_OperationID, _Code, _Body, _ValidatorState) ->
ok.
validate_response_body('list', ReturnBaseType, Body, ValidatorState) ->
[
validate(schema, ReturnBaseType, Item, ValidatorState)
|| Item <- Body];
validate_response_body(_, ReturnBaseType, Body, ValidatorState) ->
validate(schema, ReturnBaseType, Body, ValidatorState).
%%%
validate(Rule = required, Name, Value, _ValidatorState) ->
case Value of
undefined -> validation_error(Rule, Name);
_ -> ok
end;
validate(not_required, _Name, _Value, _ValidatorState) ->
ok;
validate(_, _Name, undefined, _ValidatorState) ->
ok;
validate(Rule = {type, 'integer'}, Name, Value, _ValidatorState) ->
try
{ok, {{packageName}}_utils:to_int(Value)}
catch
error:badarg ->
validation_error(Rule, Name)
end;
validate(Rule = {type, 'float'}, Name, Value, _ValidatorState) ->
try
{ok, {{packageName}}_utils:to_float(Value)}
catch
error:badarg ->
validation_error(Rule, Name)
end;
validate(Rule = {type, 'binary'}, Name, Value, _ValidatorState) ->
case is_binary(Value) of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(_Rule = {type, 'boolean'}, _Name, Value, _ValidatorState) when is_boolean(Value) ->
{ok, Value};
validate(Rule = {type, 'boolean'}, Name, Value, _ValidatorState) ->
V = binary_to_lower(Value),
try
case binary_to_existing_atom(V, utf8) of
B when is_boolean(B) -> {ok, B};
_ -> validation_error(Rule, Name)
end
catch
error:badarg ->
validation_error(Rule, Name)
end;
validate(Rule = {type, 'date'}, Name, Value, _ValidatorState) ->
case is_binary(Value) of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(Rule = {type, 'datetime'}, Name, Value, _ValidatorState) ->
case is_binary(Value) of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(Rule = {enum, Values}, Name, Value, _ValidatorState) ->
try
FormattedValue = erlang:binary_to_existing_atom(Value, utf8),
case lists:member(FormattedValue, Values) of
true -> {ok, FormattedValue};
false -> validation_error(Rule, Name)
end
catch
error:badarg ->
validation_error(Rule, Name)
end;
validate(Rule = {max, Max}, Name, Value, _ValidatorState) ->
case Value =< Max of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(Rule = {exclusive_max, ExclusiveMax}, Name, Value, _ValidatorState) ->
case Value > ExclusiveMax of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(Rule = {min, Min}, Name, Value, _ValidatorState) ->
case Value >= Min of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(Rule = {exclusive_min, ExclusiveMin}, Name, Value, _ValidatorState) ->
case Value =< ExclusiveMin of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(Rule = {max_length, MaxLength}, Name, Value, _ValidatorState) ->
case size(Value) =< MaxLength of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(Rule = {min_length, MinLength}, Name, Value, _ValidatorState) ->
case size(Value) >= MinLength of
true -> ok;
false -> validation_error(Rule, Name)
end;
validate(Rule = {pattern, Pattern}, Name, Value, _ValidatorState) ->
{ok, MP} = re:compile(Pattern),
case re:run(Value, MP) of
{match, _} -> ok;
_ -> validation_error(Rule, Name)
end;
validate(Rule = schema, Name, Value, ValidatorState) ->
Definition = list_to_binary("#/definitions/" ++ {{packageName}}_utils:to_list(Name)),
try
_ = validate_with_schema(Value, Definition, ValidatorState),
ok
catch
throw:[{schema_invalid, _, Error} | _] ->
Info = #{
type => schema_invalid,
error => Error
},
validation_error(Rule, Name, Info);
throw:[{data_invalid, Schema, Error, _, Path} | _] ->
Info = #{
type => data_invalid,
error => Error,
schema => Schema,
path => Path
},
validation_error(Rule, Name, Info)
end;
validate(Rule, Name, _Value, _ValidatorState) ->
error_logger:info_msg("Can't validate ~p with ~p", [Name, Rule]),
error({unknown_validation_rule, Rule}).
-spec validation_error(Rule :: any(), Name :: any()) -> no_return().
validation_error(ViolatedRule, Name) ->
validation_error(ViolatedRule, Name, #{}).
-spec validation_error(Rule :: any(), Name :: any(), Info :: #{}) -> no_return().
validation_error(ViolatedRule, Name, Info) ->
throw({wrong_param, Name, ViolatedRule, Info}).
-spec get_value(body | qs_val | header | binding, Name :: any(), Req0 :: cowboy_req:req()) ->
{Value :: any(), Req :: cowboy_req:req()} |
{error, Reason :: any(), Req :: cowboy_req:req()}.
get_value(body, _Name, Req0) ->
{ok, Body, Req} = cowboy_req:body(Req0),
case prepare_body(Body) of
{error, Reason} ->
{error, Reason, Req};
Value ->
{Value, Req}
end;
get_value(qs_val, Name, Req0) ->
{QS, Req} = cowboy_req:qs_vals(Req0),
Value = {{packageName}}_utils:get_opt({{packageName}}_utils:to_qs(Name), QS),
{Value, Req};
get_value(header, Name, Req0) ->
{Headers, Req} = cowboy_req:headers(Req0),
Value = {{packageName}}_utils:get_opt({{packageName}}_utils:to_header(Name), Headers),
{Value, Req};
get_value(binding, Name, Req0) ->
{Bindings, Req} = cowboy_req:bindings(Req0),
Value = {{packageName}}_utils:get_opt({{packageName}}_utils:to_binding(Name), Bindings),
{Value, Req}.
prepare_body(Body) ->
case Body of
<<"">> -> <<"">>;
_ ->
try
jsx:decode(Body, [return_maps])
catch
error:_ ->
{error, {invalid_body, not_json, Body}}
end
end.
validate_with_schema(Body, Definition, ValidatorState) ->
jesse_schema_validator:validate_with_state(
[{<<"$ref">>, Definition}],
Body,
ValidatorState
).
prepare_param(Rules, Name, Value, ValidatorState) ->
try
Result = lists:foldl(
fun(Rule, Acc) ->
case validate(Rule, Name, Acc, ValidatorState) of
ok -> Acc;
{ok, Prepared} -> Prepared
end
end,
Value,
Rules
),
{ok, Result}
catch
throw:Reason ->
{error, Reason}
end.
binary_to_lower(V) when is_binary(V) ->
list_to_binary(string:to_lower({{packageName}}_utils:to_list(V))).
