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body_parameter_extract_strategy.go
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/
body_parameter_extract_strategy.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 extractors
import (
"strings"
"github.com/dadrus/heimdall/internal/heimdall"
"github.com/dadrus/heimdall/internal/x/errorchain"
)
type BodyParameterExtractStrategy struct {
Name string
}
func (es BodyParameterExtractStrategy) GetAuthData(ctx heimdall.Context) (string, error) {
data := ctx.Request().Body()
entries, ok := data.(map[string]any)
if !ok {
return "", errorchain.NewWithMessage(heimdall.ErrArgument, "no usable body present")
}
entry, ok := entries[es.Name]
if !ok {
return "", errorchain.NewWithMessagef(heimdall.ErrArgument,
"no %s parameter present in request body", es.Name)
}
var value string
switch val := entry.(type) {
case string:
value = val
case []string:
if len(val) != 1 {
return "", errorchain.NewWithMessagef(heimdall.ErrArgument,
"%s request body parameter is present multiple times", es.Name)
}
value = val[0]
case []any:
if len(val) != 1 {
return "", errorchain.NewWithMessagef(heimdall.ErrArgument,
"%s request body parameter is present multiple times", es.Name)
}
value, ok = val[0].(string)
if !ok {
return "", errorchain.NewWithMessagef(heimdall.ErrArgument,
"unexpected type for %s request body parameter", es.Name)
}
default:
return "", errorchain.NewWithMessagef(heimdall.ErrArgument,
"unexpected type for %s request body parameter", es.Name)
}
return strings.TrimSpace(value), nil
}