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mapstructure_decoder.go
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/
mapstructure_decoder.go
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// Copyright 2022 Dimitrij Drus <dadrus@gmx.de>
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package rule
import (
"errors"
"fmt"
"reflect"
"github.com/dadrus/heimdall/internal/x"
)
var (
ErrURLMissing = errors.New("url property not present")
ErrURLType = errors.New("bad url type")
ErrStrategyType = errors.New("bad strategy type")
ErrUnsupportedStrategy = errors.New("unsupported strategy")
)
func decodeMatcher(from reflect.Type, to reflect.Type, data any) (any, error) {
if to != reflect.TypeOf(Matcher{}) {
return data, nil
}
if from.Kind() != reflect.String && from.Kind() != reflect.Map {
return data, nil
}
if from.Kind() == reflect.String {
// nolint: forcetypeassert
// already checked above
return Matcher{URL: data.(string), Strategy: "glob"}, nil
}
// nolint: forcetypeassert
// already checked above
values := data.(map[string]any)
var strategyValue string
URL, urlPresent := values["url"]
if !urlPresent {
return nil, ErrURLMissing
}
urlValue, ok := URL.(string)
if !ok {
return nil, ErrURLType
}
strategy, strategyPresent := values["strategy"]
if strategyPresent {
strategyValue, ok = strategy.(string)
if !ok {
return nil, ErrStrategyType
}
if strategyValue != "glob" && strategyValue != "regex" {
return nil, fmt.Errorf("%w: %s", ErrUnsupportedStrategy, strategyValue)
}
}
return Matcher{
URL: urlValue,
Strategy: x.IfThenElse(strategyPresent, strategyValue, "glob"),
}, nil
}