GO WordDecoder.DecodeHeader用法及代碼示例

package main

import (
    "bytes"
    "fmt"
    "io"
    "mime"
)

func main() {
    dec := new(mime.WordDecoder)
    header, err := dec.DecodeHeader("=?utf-8?q?=C3=89ric?= <eric@example.org>, =?utf-8?q?Ana=C3=AFs?= <anais@example.org>")
    if err != nil {
        panic(err)
    }
    fmt.Println(header)

    header, err = dec.DecodeHeader("=?utf-8?q?=C2=A1Hola,?= =?utf-8?q?_se=C3=B1or!?=")
    if err != nil {
        panic(err)
    }
    fmt.Println(header)

    dec.CharsetReader = func(charset string, input io.Reader) (io.Reader, error) {
        switch charset {
        case "x-case":
            // Fake character set for example.
            // Real use would integrate with packages such
            // as code.google.com/p/go-charset
            content, err := io.ReadAll(input)
            if err != nil {
                return nil, err
            }
            return bytes.NewReader(bytes.ToUpper(content)), nil
        default:
            return nil, fmt.Errorf("unhandled charset %q", charset)
        }
    }
    header, err = dec.DecodeHeader("=?x-case?q?hello_?= =?x-case?q?world!?=")
    if err != nil {
        panic(err)
    }
    fmt.Println(header)
}

Éric <eric@example.org>, Anaïs <anais@example.org>
¡Hola, señor!
HELLO WORLD!