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// Copyright 2018 The Hugo Authors. All rights reserved.
//
// 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 transform
import (
"io/ioutil"
"github.com/gohugoio/hugo/common/hugio"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/parser/metadecoders"
"github.com/gohugoio/hugo/resource"
"github.com/pkg/errors"
"github.com/spf13/cast"
)
// Unmarshal unmarshals the data given, which can be either a string
// or a Resource. Supported formats are JSON, TOML and YAML.
func (ns *Namespace) Unmarshal(data interface{}) (interface{}, error) {
// All the relevant Resource types implements ReadSeekCloserResource,
// which should be the most effective way to get the content.
if r, ok := data.(resource.ReadSeekCloserResource); ok {
var key string
var reader hugio.ReadSeekCloser
if k, ok := r.(resource.Identifier); ok {
key = k.Key()
}
if key == "" {
reader, err := r.ReadSeekCloser()
if err != nil {
return nil, err
}
defer reader.Close()
key, err = helpers.MD5FromReader(reader)
if err != nil {
return nil, err
}
reader.Seek(0, 0)
}
return ns.cache.GetOrCreate(key, func() (interface{}, error) {
f := metadecoders.FormatFromMediaType(r.MediaType())
if f == "" {
return nil, errors.Errorf("MIME %q not supported", r.MediaType())
}
if reader == nil {
var err error
reader, err = r.ReadSeekCloser()
if err != nil {
return nil, err
}
defer reader.Close()
}
b, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
return metadecoders.Unmarshal(b, f)
})
}
dataStr, err := cast.ToStringE(data)
if err != nil {
return nil, errors.Errorf("type %T not supported", data)
}
key := helpers.MD5String(dataStr)
return ns.cache.GetOrCreate(key, func() (interface{}, error) {
f := metadecoders.FormatFromContentString(dataStr)
if f == "" {
return nil, errors.New("unknown format")
}
return metadecoders.Unmarshal([]byte(dataStr), f)
})
}
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