config: Add the foundation for GDPR privacy configuration

See #4616

config/configProvider.go

@@ -13,6 +13,12 @@
 
 package config
 
+import (
+	"strings"
+
+	"github.com/spf13/viper"
+)
+
 // Provider provides the configuration settings for Hugo.
 type Provider interface {
 	GetString(key string) string
@@ -25,3 +31,14 @@ type Provider interface {
 	Set(key string, value interface{})
 	IsSet(key string) bool
 }
+
+// FromConfigString creates a config from the given YAML, JSON or TOML config. This is useful in tests.
+func FromConfigString(config, configType string) (Provider, error) {
+	v := viper.New()
+	v.SetConfigType(configType)
+	if err := v.ReadConfig(strings.NewReader(config)); err != nil {
+		return nil, err
+	}
+	return v, nil
+
+}

config/privacy/privacyConfig.go

@@ -0,0 +1,85 @@
+// 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 privacy
+
+import (
+	"github.com/gohugoio/hugo/config"
+	"github.com/mitchellh/mapstructure"
+)
+
+const privacyConfigKey = "privacy"
+
+// Service is the common values for a service in a policy definition.
+type Service struct {
+	Disable bool
+}
+
+// Config is a privacy configuration for all the relevant services in Hugo.
+type Config struct {
+	Disqus          Disqus
+	GoogleAnalytics GoogleAnalytics
+	Instagram       Instagram
+	SpeakerDeck     SpeakerDeck
+	Tweet           Tweet
+	Vimeo           Vimeo
+	YouTube         YouTube
+}
+
+// Disqus holds the privacy configuration settings related to the Disqus template.
+type Disqus struct {
+	Service `mapstructure:",squash"`
+}
+
+// GoogleAnalytics holds the privacy configuration settings related to the Google Analytics template.
+type GoogleAnalytics struct {
+	Service `mapstructure:",squash"`
+}
+
+// Instagram holds the privacy configuration settings related to the Instagram shortcode.
+type Instagram struct {
+	Service `mapstructure:",squash"`
+}
+
+// SpeakerDeck holds the privacy configuration settings related to the SpeakerDeck shortcode.
+type SpeakerDeck struct {
+	Service `mapstructure:",squash"`
+}
+
+// Tweet holds the privacy configuration settingsrelated to the Tweet shortcode.
+type Tweet struct {
+	Service `mapstructure:",squash"`
+}
+
+// Vimeo holds the privacy configuration settingsrelated to the Vimeo shortcode.
+type Vimeo struct {
+	Service `mapstructure:",squash"`
+}
+
+// YouTube holds the privacy configuration settingsrelated to the YouTube shortcode.
+type YouTube struct {
+	Service  `mapstructure:",squash"`
+	NoCookie bool
+}
+
+func DecodeConfig(cfg config.Provider) (pc Config, err error) {
+	if !cfg.IsSet(privacyConfigKey) {
+		return
+	}
+
+	m := cfg.GetStringMap(privacyConfigKey)
+
+	err = mapstructure.WeakDecode(m, &pc)
+
+	return
+}

config/privacy/privacyConfig_test.go

@@ -0,0 +1,93 @@
+// 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 privacy
+
+import (
+	"testing"
+
+	"github.com/gohugoio/hugo/config"
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDecodeConfigFromTOML(t *testing.T) {
+	assert := require.New(t)
+
+	tomlConfig := `
+
+someOtherValue = "foo"
+
+[privacy]
+[privacy.disqus]
+disable = true
+[privacy.googleAnalytics]
+disable = true
+[privacy.instagram]
+disable = true
+[privacy.speakerDeck]
+disable = true
+[privacy.tweet]
+disable = true
+[privacy.vimeo]
+disable = true
+[privacy.youtube]
+disable = true
+noCookie = true
+`
+	cfg, err := config.FromConfigString(tomlConfig, "toml")
+	assert.NoError(err)
+
+	pc, err := DecodeConfig(cfg)
+	assert.NoError(err)
+	assert.NotNil(pc)
+
+	assert.True(pc.Disqus.Disable)
+	assert.True(pc.GoogleAnalytics.Disable)
+	assert.True(pc.Instagram.Disable)
+	assert.True(pc.SpeakerDeck.Disable)
+	assert.True(pc.Tweet.Disable)
+	assert.True(pc.Vimeo.Disable)
+
+	assert.True(pc.YouTube.NoCookie)
+	assert.True(pc.YouTube.Disable)
+}
+
+func TestDecodeConfigFromTOMLCaseInsensitive(t *testing.T) {
+	assert := require.New(t)
+
+	tomlConfig := `
+
+someOtherValue = "foo"
+
+[Privacy]
+[Privacy.YouTube]
+NoCOOKIE = true
+`
+	cfg, err := config.FromConfigString(tomlConfig, "toml")
+	assert.NoError(err)
+
+	pc, err := DecodeConfig(cfg)
+	assert.NoError(err)
+	assert.NotNil(pc)
+	assert.True(pc.YouTube.NoCookie)
+}
+
+func TestDecodeConfigDefault(t *testing.T) {
+	assert := require.New(t)
+
+	pc, err := DecodeConfig(viper.New())
+	assert.NoError(err)
+	assert.NotNil(pc)
+	assert.False(pc.YouTube.NoCookie)
+}