解码UTF8电子邮件标题 [英] Decode an UTF8 email header

问题描述

我有一个电子邮件主题：

I have an email subject of the form:

=?utf-8?B?T3.....?=

电子邮件的正文是utf-8 base64编码 - 已经解码了。
我目前使用Perl的Email :: MIME模块解码电子邮件。

The body of the email is utf-8 base64 encoded - and has decoded fine. I am current using Perl's Email::MIME module to decode the email.

=？utf-8分隔符的含义是什么？从这个字符串中提取信息？

What is the meaning of the =?utf-8 delimiter and how do I extract information from this string?

推荐答案

encoded-word 令牌（根据 RFC 2047 ）可能发生在某些标题的值中。他们被解析如下：

The encoded-word tokens (as per RFC 2047) can occur in values of some headers. They are parsed as follows:

=?<charset>?<encoding>?<data>?=

在这种情况下，字符集是UTF-8，编码是 B 这意味着base64（另一个选项是 Q ，这意味着Quoted Printable）。

Charset is UTF-8 in this case, the encoding is B which means base64 (the other option is Q which means Quoted Printable).

要阅读它，首先对base64进行解码，然后将其视为UTF-8字符。

To read it, first decode the base64, then treat it as UTF-8 characters.

还可以阅读各种Internet Mail RFC了解更多详细信息，主要是< a href =http://www.faqs.org/rfcs/rfc2047.html =noreferrer> RFC 2047 。

Also read the various Internet Mail RFCs for more detail, mainly RFC 2047.

既然你正在使用Perl， Encode :: MIME :: Header 可能会使用：

Since you are using Perl, Encode::MIME::Header could be of use:

概要

SYNOPSIS

use Encode qw/encode decode/;
$utf8   = decode('MIME-Header', $header);
$header = encode('MIME-Header', $utf8);

摘要

此模块实现RFC 2047 Mime
标题编码。有3个变量
编码名称; MIME-Header，MIME-B
和MIME-Q。差异是
描述如下

This module implements RFC 2047 Mime Header Encoding. There are 3 variant encoding names; MIME-Header, MIME-B and MIME-Q. The difference is described below

              decode()          encode()  
MIME-Header   Both B and Q      =?UTF-8?B?....?=  
MIME-B        B only; Q croaks  =?UTF-8?B?....?=  
MIME-Q        Q only; B croaks  =?UTF-8?Q?....?=

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