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// Copyright 2019 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 (
"errors"
"fmt"
"io"
"strings"
"github.com/gohugoio/hugo/resources"
"github.com/gohugoio/hugo/resources/resource"
"github.com/gohugoio/hugo/common/types"
"github.com/mitchellh/mapstructure"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/parser/metadecoders"
"github.com/spf13/cast"
)
// Unmarshal unmarshals the data given, which can be either a string, json.RawMessage
// or a Resource. Supported formats are JSON, TOML, YAML, and CSV.
// You can optionally provide an options map as the first argument.
func (ns *Namespace) Unmarshal(args ...any) (any, error) {
if len(args) < 1 || len(args) > 2 {
return nil, errors.New("unmarshal takes 1 or 2 arguments")
}
var data any
decoder := metadecoders.Default
if len(args) == 1 {
data = args[0]
} else {
m, ok := args[0].(map[string]any)
if !ok {
return nil, errors.New("first argument must be a map")
}
var err error
data = args[1]
decoder, err = decodeDecoder(m)
if err != nil {
return nil, fmt.Errorf("failed to decode options: %w", err)
}
}
if r, ok := data.(resource.UnmarshableResource); ok {
key := r.Key()
if key == "" {
return nil, errors.New("no Key set in Resource")
}
if decoder != metadecoders.Default {
key += decoder.OptionsKey()
}
v, err := ns.cache.GetOrCreate(key, func(string) (*resources.StaleValue[any], error) {
f := metadecoders.FormatFromStrings(r.MediaType().Suffixes()...)
if f == "" {
return nil, fmt.Errorf("MIME %q not supported", r.MediaType())
}
reader, err := r.ReadSeekCloser()
if err != nil {
return nil, err
}
defer reader.Close()
b, err := io.ReadAll(reader)
if err != nil {
return nil, err
}
v, err := decoder.Unmarshal(b, f)
if err != nil {
return nil, err
}
return &resources.StaleValue[any]{
Value: v,
StaleVersionFunc: func() uint32 {
return resource.StaleVersion(r)
},
}, nil
})
if err != nil {
return nil, err
}
return v.Value, nil
}
dataStr, err := types.ToStringE(data)
if err != nil {
return nil, fmt.Errorf("type %T not supported", data)
}
if dataStr == "" {
return nil, errors.New("no data to transform")
}
key := helpers.MD5String(dataStr)
v, err := ns.cache.GetOrCreate(key, func(string) (*resources.StaleValue[any], error) {
f := decoder.FormatFromContentString(dataStr)
if f == "" {
return nil, errors.New("unknown format")
}
v, err := decoder.Unmarshal([]byte(dataStr), f)
if err != nil {
return nil, err
}
return &resources.StaleValue[any]{
Value: v,
StaleVersionFunc: func() uint32 {
return 0
},
}, nil
})
if err != nil {
return nil, err
}
return v.Value, nil
}
func decodeDecoder(m map[string]any) (metadecoders.Decoder, error) {
opts := metadecoders.Default
if m == nil {
return opts, nil
}
// mapstructure does not support string to rune conversion, so do that manually.
// See https://github.com/mitchellh/mapstructure/issues/151
for k, v := range m {
if strings.EqualFold(k, "Delimiter") {
r, err := stringToRune(v)
if err != nil {
return opts, err
}
opts.Delimiter = r
delete(m, k)
} else if strings.EqualFold(k, "Comment") {
r, err := stringToRune(v)
if err != nil {
return opts, err
}
opts.Comment = r
delete(m, k)
}
}
err := mapstructure.WeakDecode(m, &opts)
return opts, err
}
func stringToRune(v any) (rune, error) {
s, err := cast.ToStringE(v)
if err != nil {
return 0, err
}
if len(s) == 0 {
return 0, nil
}
var r rune
for i, rr := range s {
if i == 0 {
r = rr
} else {
return 0, fmt.Errorf("invalid character: %q", v)
}
}
return r, nil
}
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