-
-
Save isocroft/0ed7efcc6d3e8cfdea60b14cbded644d to your computer and use it in GitHub Desktop.
Golang implementation for RFC 1342: Non-ASCII Mail Headers
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package main | |
| import ( | |
| "encoding/base64" | |
| "fmt" | |
| "io" | |
| "io/ioutil" | |
| "mime/quotedprintable" | |
| "regexp" | |
| "strings" | |
| "golang.org/x/text/encoding" | |
| "golang.org/x/text/encoding/charmap" | |
| "golang.org/x/text/encoding/unicode" | |
| ) | |
| func decoder(encoding string) (*encoding.Decoder, error) { | |
| if strings.ToUpper(encoding) == "UTF-8" { | |
| return unicode.UTF8.NewDecoder(), nil | |
| } else if strings.ToUpper(encoding) == "ISO-8859-1" { | |
| return charmap.ISO8859_1.NewDecoder(), nil | |
| } else { | |
| return nil, fmt.Errorf("Unknown encoding") | |
| } | |
| } | |
| func decodeHeader(str string) (string, error) { | |
| re := regexp.MustCompile(`\=\?(?P<charset>.*?)\?(?P<encoding>.*)\?(?P<body>.*?)\?(.*?)\=`) | |
| matches := re.FindAllStringSubmatch(str, -1) | |
| if len(matches) == 0 { | |
| return str, nil | |
| } | |
| for _, match := range matches { | |
| var r io.Reader = strings.NewReader(match[3]) | |
| if match[2] == "Q" { | |
| r = quotedprintable.NewReader(r) | |
| } else if match[2] == "B" { | |
| r = base64.NewDecoder(base64.StdEncoding, r) | |
| } | |
| if d, err := decoder(match[1]); err == nil { | |
| r = d.Reader(r) | |
| } | |
| if val, err := ioutil.ReadAll(r); err == nil { | |
| str = strings.Replace(str, match[0], string(val), -1) | |
| } else if err != nil { | |
| fmt.Println(err.Error()) | |
| continue | |
| } | |
| } | |
| return str, nil | |
| } | |
| func main() { | |
| fmt.Println(decodeHeader("=?UTF-8?Q?=F3=BE=AC=8D_?= ... Laten we ontmoeten! Ik woon in de buurt ..")) | |
| fmt.Println(decodeHeader("=?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= <keld@dkuug.dk>")) | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment