主题编码的电子邮件（RFC2047）。 解码错误

Question

I'm writing app in Golang. I need to decode email subject.

Original subject:

Raport z eksportu ogłoszeń nieruchomości

Encoded subject:

=?utf-8?B?RG9tLmV1IC0gcmFwb3J0IHogZWtzcG9ydHUgb2fFgm9zemXF?=  =?utf-8?B?hCBuaWVydWNob21vxZtjaQ==?=^M

Decoded subject: "Raport z eksportu ogłosze▒ ▒ nieruchomości"

I use github.com/famz/RFC2047 to decode email subjects.

My code is simple:

RFC2047.Decode(msg.Header.Get("Subject"))

Why, after decoding the subject is broken? Other subjects are correctly decoded. Is this a bad encoded subject?

Answer 1

If you're using Go 1.5, you can use the new functions of the mime package.

If you're using an older version of Go, you can use my drop-in replacement.

Example:

package main

import (
    "fmt"
    "mime" // When using Go 1.5
    mime "gopkg.in/alexcesaro/quotedprintable.v3" // When using older Go versions
)

func main() {
    s := "=?utf-8?B?RG9tLmV1IC0gcmFwb3J0IHogZWtzcG9ydHUgb2fFgm9zemXF?=  =?utf-8?B?hCBuaWVydWNob21vxZtjaQ==?="
    dec := new(mime.WordDecoder)
    subject, err := dec.DecodeHeader(s)
    if err != nil {
        panic(err)
    }
    fmt.Println(subject)
    // Output:
    // Dom.eu - raport z eksportu ogłoszeń nieruchomości
}