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// Copyright 2024 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 output
import (
"fmt"
"reflect"
"sort"
"strings"
"github.com/gohugoio/hugo/common/maps"
"github.com/gohugoio/hugo/config"
"github.com/gohugoio/hugo/media"
"github.com/mitchellh/mapstructure"
)
// OutputFormatConfig configures a single output format.
type OutputFormatConfig struct {
// The MediaType string. This must be a configured media type.
MediaType string
Format
}
var defaultOutputFormat = Format{
BaseName: "index",
Rel: "alternate",
}
func DecodeConfig(mediaTypes media.Types, in any) (*config.ConfigNamespace[map[string]OutputFormatConfig, Formats], error) {
buildConfig := func(in any) (Formats, any, error) {
f := make(Formats, len(DefaultFormats))
copy(f, DefaultFormats)
if in != nil {
m, err := maps.ToStringMapE(in)
if err != nil {
return nil, nil, fmt.Errorf("failed convert config to map: %s", err)
}
m = maps.CleanConfigStringMap(m)
for k, v := range m {
found := false
for i, vv := range f {
// Both are lower case.
if k == vv.Name {
// Merge it with the existing
if err := decode(mediaTypes, v, &f[i]); err != nil {
return f, nil, err
}
found = true
}
}
if found {
continue
}
newOutFormat := defaultOutputFormat
if err := decode(mediaTypes, v, &newOutFormat); err != nil {
return f, nil, err
}
newOutFormat.Name = k
f = append(f, newOutFormat)
}
}
// Also format is a map for documentation purposes.
docm := make(map[string]OutputFormatConfig, len(f))
for _, ff := range f {
docm[ff.Name] = OutputFormatConfig{
MediaType: ff.MediaType.Type,
Format: ff,
}
}
sort.Sort(f)
return f, docm, nil
}
return config.DecodeNamespace[map[string]OutputFormatConfig](in, buildConfig)
}
func decode(mediaTypes media.Types, input any, output *Format) error {
config := &mapstructure.DecoderConfig{
Metadata: nil,
Result: output,
WeaklyTypedInput: true,
DecodeHook: func(a reflect.Type, b reflect.Type, c any) (any, error) {
if a.Kind() == reflect.Map {
dataVal := reflect.Indirect(reflect.ValueOf(c))
for _, key := range dataVal.MapKeys() {
keyStr, ok := key.Interface().(string)
if !ok {
// Not a string key
continue
}
if strings.EqualFold(keyStr, "mediaType") {
// If mediaType is a string, look it up and replace it
// in the map.
vv := dataVal.MapIndex(key)
vvi := vv.Interface()
switch vviv := vvi.(type) {
case media.Type:
// OK
case string:
mediaType, found := mediaTypes.GetByType(vviv)
if !found {
return c, fmt.Errorf("media type %q not found", vviv)
}
dataVal.SetMapIndex(key, reflect.ValueOf(mediaType))
default:
return nil, fmt.Errorf("invalid output format configuration; wrong type for media type, expected string (e.g. text/html), got %T", vvi)
}
}
}
}
return c, nil
},
}
decoder, err := mapstructure.NewDecoder(config)
if err != nil {
return err
}
if err = decoder.Decode(input); err != nil {
return fmt.Errorf("failed to decode output format configuration: %w", err)
}
return nil
}
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