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base64encode.go
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base64encode.go
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// Copyright 2015-2017 trivago GmbH
//
// 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 format
import (
"encoding/base64"
"github.com/trivago/gollum/core"
)
// Base64Encode formatter
//
// Base64Encode is a formatter that decodes Base64 encoded strings. Custom dictionaries
// are supported, by default RFC 4648 standard encoding is used.
//
// Parameters
//
// - Base64Dictionary: Defines the 64-character base64 lookup dictionary to use.
// When left empty a RFC 4648 standard encoding is used.
// By default this parameter is set to "".
//
// Examples
//
// This example uses RFC 4648 URL encoding to format incoming data.
//
// ExampleConsumer:
// Type: consumer.Console
// Streams: console
// Modulators:
// - formatter.Base64Encode
// Dictionary: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
//
type Base64Encode struct {
core.SimpleFormatter `gollumdoc:"embed_type"`
dictionary *base64.Encoding
}
func init() {
core.TypeRegistry.Register(Base64Encode{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *Base64Encode) Configure(conf core.PluginConfigReader) {
dict := conf.GetString("Dictionary", "")
if dict == "" {
format.dictionary = base64.StdEncoding
} else {
if len(dict) != 64 {
conf.Errors.Pushf("Base64 dictionary must contain 64 characters.")
}
format.dictionary = base64.NewEncoding(dict)
}
}
// ApplyFormatter update message payload
func (format *Base64Encode) ApplyFormatter(msg *core.Message) error {
encoded := format.getEncodedContent(format.GetAppliedContent(msg))
format.SetAppliedContent(msg, encoded)
return nil
}
func (format *Base64Encode) getEncodedContent(content []byte) []byte {
encodedLen := format.dictionary.EncodedLen(len(content))
encoded := core.MessageDataPool.Get(encodedLen)
format.dictionary.Encode(encoded, content)
return encoded
}