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base64encode.go
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base64encode.go
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// Copyright 2015 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"
"fmt"
"github.com/trivago/gollum/core"
"github.com/trivago/gollum/shared"
)
// Base64Encode is a formatter that encodes a message as base64.
// Configuration example
//
// - "<producer|stream>":
// Formatter: "format.Base64Encode"
// Dictionary: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890+/"
//
// Dictionary defines the 64-character base64 lookup dictionary to use. When
// left empty a dictionary as defined by RFC4648 is used. This is the default.
//
// Base64DataFormatter defines a formatter that is applied before the base64
// encoding takes place. By default this is set to "format.Forward"
type Base64Encode struct {
base core.Formatter
dictionary *base64.Encoding
}
func init() {
shared.RuntimeType.Register(Base64Encode{})
}
// Configure initializes this formatter with values from a plugin config.
func (format *Base64Encode) Configure(conf core.PluginConfig) error {
plugin, err := core.NewPluginWithType(conf.GetString("Base64DataFormatter", "format.Forward"), conf)
if err != nil {
return err
}
format.base = plugin.(core.Formatter)
dict := conf.GetString("Dictionary", "")
if dict == "" {
format.dictionary = base64.StdEncoding
} else {
if len(dict) != 64 {
return fmt.Errorf("Base64 dictionary must contain 64 characters.")
}
format.dictionary = base64.NewEncoding(dict)
}
return nil
}
// Format returns the original message payload
func (format *Base64Encode) Format(msg core.Message) ([]byte, core.MessageStreamID) {
data, streamID := format.base.Format(msg)
encoded := make([]byte, format.dictionary.EncodedLen(len(data)))
format.dictionary.Encode(encoded, data)
return encoded, streamID
}