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json.go
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/
json.go
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// Copyright © 2024 Attestant Limited.
// 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.
package http
import (
"encoding/json"
"errors"
"fmt"
"io"
"github.com/huandu/go-clone"
)
func decodeJSONResponse[T any](body io.Reader, res T) (T, map[string]any, error) {
if body == nil {
return res, nil, errors.New("no body to read")
}
decoded := make(map[string]json.RawMessage)
if err := json.NewDecoder(body).Decode(&decoded); err != nil {
return res, nil, errors.Join(errors.New("failed to parse JSON"), err)
}
//nolint:forcetypeassert
data, isCorrectType := clone.Clone(res).(T)
if !isCorrectType {
return res, nil, ErrIncorrectType
}
metadata := make(map[string]any)
for k, v := range decoded {
switch k {
case "data":
err := json.Unmarshal(v, &data)
if err != nil {
return res, nil, errors.Join(errors.New("failed to unmarshal data"), err)
}
default:
var val any
err := json.Unmarshal(v, &val)
if err != nil {
return res, nil, errors.Join(fmt.Errorf("failed to unmarshal metadata %s", k), err)
}
metadata[k] = val
}
}
return data, metadata, nil
}