Package mime implements parts of the MIME spec.
ErrInvalidMediaParameter is returned by ParseMediaType if the media type value was found but there was an error parsing the optional parameters
AddExtensionType sets the MIME type associated with the extension ext to typ. The extension should begin with a leading dot, as in ".html".
ExtensionsByType returns the extensions known to be associated with the MIME type typ. The returned extensions will each begin with a leading dot, as in ".html". When typ has no associated extensions, ExtensionsByType returns an nil slice.
FormatMediaType serializes mediatype t and the parameters param as a media type conforming to RFC 2045 and RFC 2616. The type and parameter names are written in lower-case. When any of the arguments result in a standard violation then FormatMediaType returns the empty string.
package main
import (
"fmt"
"mime"
)
func main() {
mediatype := "text/html"
params := map[string]string{
"charset": "utf-8",
}
result := mime.FormatMediaType(mediatype, params)
fmt.Println("result:", result)
}
Output: result: text/html; charset=utf-8
ParseMediaType parses a media type value and any optional parameters, per RFC 1521. Media types are the values in Content-Type and Content-Disposition headers (RFC 2183). On success, ParseMediaType returns the media type converted to lowercase and trimmed of white space and a non-nil map. If there is an error parsing the optional parameter, the media type will be returned along with the error ErrInvalidMediaParameter. The returned map, params, maps from the lowercase attribute to the attribute value with its case preserved.
package main
import (
"fmt"
"mime"
)
func main() {
mediatype, params, err := mime.ParseMediaType("text/html; charset=utf-8")
if err != nil {
panic(err)
}
fmt.Println("type:", mediatype)
fmt.Println("charset:", params["charset"])
}
Output: type: text/html charset: utf-8
TypeByExtension returns the MIME type associated with the file extension ext. The extension ext should begin with a leading dot, as in ".html". When ext has no associated type, TypeByExtension returns "".
Extensions are looked up first case-sensitively, then case-insensitively.
The built-in table is small but on unix it is augmented by the local system's MIME-info database or mime.types file(s) if available under one or more of these names:
/usr/local/share/mime/globs2 /usr/share/mime/globs2 /etc/mime.types /etc/apache2/mime.types /etc/apache/mime.types
On Windows, MIME types are extracted from the registry.
Text types have the charset parameter set to "utf-8" by default.
A WordDecoder decodes MIME headers containing RFC 2047 encoded-words.
Decode decodes an RFC 2047 encoded-word.
package main
import (
"bytes"
"fmt"
"io"
"mime"
)
func main() {
dec := new(mime.WordDecoder)
header, err := dec.Decode("=?utf-8?q?=C2=A1Hola,_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.Decode("=?x-case?q?hello!?=")
if err != nil {
panic(err)
}
fmt.Println(header)
}
Output: ¡Hola, señor! HELLO!
DecodeHeader decodes all encoded-words of the given string. It returns an error if and only if [WordDecoder.CharsetReader] of d returns an error.
A WordEncoder is an RFC 2047 encoded-word encoder.
Encode returns the encoded-word form of s. If s is ASCII without special characters, it is returned unchanged. The provided charset is the IANA charset name of s. It is case insensitive.
package main
import (
"fmt"
"mime"
)
func main() {
fmt.Println(mime.QEncoding.Encode("utf-8", "¡Hola, señor!"))
fmt.Println(mime.QEncoding.Encode("utf-8", "Hello!"))
fmt.Println(mime.BEncoding.Encode("UTF-8", "¡Hola, señor!"))
fmt.Println(mime.QEncoding.Encode("ISO-8859-1", "Caf\xE9"))
}
Output: =?utf-8?q?=C2=A1Hola,_se=C3=B1or!?= Hello! =?UTF-8?b?wqFIb2xhLCBzZcOxb3Ih?= =?ISO-8859-1?q?Caf=E9?=
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