//根据编码格式获取转码后的主题内容
func getRealSubject(lang, encoding, content string) []byte {
encoding = strings.ToLower(encoding)
if encoding == "b" {
decoded, err := base64.StdEncoding.DecodeString(content)
if err != nil {
log.Printf("decode error:%s", err)
return nil
}
if lang == "utf-8" {
log.Printf(string(decoded))
return decoded
}
//非u8编码语言需要统一转为u8
dec := mahonia.NewDecoder(lang)
if decoded, ok := dec.ConvertStringOK(string(decoded)); ok {
log.Printf(string(decoded))
}
return decoded
} else if encoding == "q" {
return nil
} else {
return nil
}
}
func getDecodingContent(lang, encoding, content string) string {
if encoding == "b" {
decoded, err := base64.StdEncoding.DecodeString(content)
if err != nil {
log.Printf("decode error:%s", err)
return ""
}
if lang == "utf-8" {
//log.Printf("utf-8, noneed to convert: %s\n", string(decoded))
return string(decoded)
}
//非u8编码语言需要统一转为u8
dec := mahonia.NewDecoder(lang)
if u8Decoded, ok := dec.ConvertStringOK(string(decoded)); ok {
//log.Printf("%s convert to utf-8: %s\n", lang, string(decoded))
return string(u8Decoded) //注意作用域
}
} else if encoding == "q" {
//通过字符串构造Reader
r := quotedprintable.NewReader(strings.NewReader(content))
body, err := ioutil.ReadAll(r)
if err != nil {
log.Printf("read content error: %s", err)
return ""
}
log.Printf("quoted decode: %s\n", string(body))
return string(body)
}
//转换失败，返回空
return ""
}