How to encode and decode data as Base64 in MIME messages in Go?

To encode and decode data as Base64 in MIME messages in Go, you can use the encoding/base64 package. Here's an example of encoding and decoding data using Base64 in MIME messages:

package main

import (
	"encoding/base64"
	"fmt"
)

func main() {
	// Encode data as Base64
	message := "Hello, World!"
	encodedMessage := base64.StdEncoding.EncodeToString([]byte(message))
	fmt.Println("Encoded message:", encodedMessage)

	// Decode Base64 encoded data
	decodedMessage, err := base64.StdEncoding.DecodeString(encodedMessage)
	if err != nil {
		fmt.Println("Decoding error:", err)
		return
	}
	fmt.Println("Decoded message:", string(decodedMessage))
}

Output:

Encoded message: SGVsbG8sIFdvcmxkIQ==
Decoded message: Hello, World!

In this example, we use the EncodeToString function to encode the message string to Base64. Then, the DecodeString function is used to decode the Base64-encoded message. Note that the DecodeString function returns an error if there's an issue with decoding, so it's a good practice to handle the error appropriately.