config: Add the foundation for GDPR privacy configuration

See #4616

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)
+}