multipart-related

multipart-related implements MIME multipart/related in go, RFC 2387

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multipart-related requires Go version 1.2 or greater.

What is multipart-related

The Package related implements MIME multipart/related parsing, as defined in RFC 2387.

See Wikipedia:

A multipart/related is used to indicate that each message part is a component of an aggregate whole. It is for compound objects consisting of several inter-related components - proper display cannot be achieved by individually displaying the constituent parts. The message consists of a root part (by default, the first) which reference other parts inline, which may in turn reference other parts. Message parts are commonly referenced by the "Content-ID" part header. The syntax of a reference is unspecified and is instead dictated by the encoding or protocol used in the part.

One common usage of this subtype is to send a web page complete with images in a single message. The root part would contain the HTML document, and use image tags to reference images stored in the latter parts.

Compatible with Google's Drive REST API

Usage

import "github.com/philippfranke/multipart-related/related"

Writer

content := []byte(`Life? Don't talk to me about life!`)   // Douglas Adams, The Hitchhiker's Guide to the Galaxy
var b bytes.Buffer
w := related.NewWriter(&b)

rootPart, err := w.CreateRoot("[email protected]", "H2/G2", nil)
if err != nil {
  panic(err)
}

rootPart.Write(content[:5])

nextPart, err := w.CreatePart("", nil)
if err != nil {
  panic(err)
}
nextPart.Write(content[5:])

if err := w.Close(); err != nil {
  panic(err)
}

fmt.Printf("The compound Object Content-Type:\n %s \n", w.FormDataContentType())
fmt.Fprintf(os.Stdout, "Body: \n %s", b.String())

Reader

header := `multipart/related; boundary=example-1;
                start="<[email protected]>";
                type="a/b"`

msg := strings.NewReader(`--example-1
Content-Type: a/b
Content-ID: <[email protected]>

Life?
--example-1
Content-Type: b/c
Content-Transfer-Encoding: base64
Content-ID: <[email protected]>

RG9uJ3QgdGFsayB0byBtZSBhYm91dCBsaWZlIQ==

--example-1--`)

  mediaType, params, err := mime.ParseMediaType(header)
  if err != nil {
    panic(err)
  }
  if mediaType != "multipart/related" {
    panic(nil)
  }

  r := related.NewReader(msg, params)
  object, err := r.ReadObject()
  if err != nil {
    panic(err)
  }
  for i, part := range object.Values {
    b, err := ioutil.ReadAll(part)
    if err != nil {
      panic(err)
    }
    fmt.Printf("%d.: %s \n", i, string(b))
  }

License

This library is distributed under the BSD-style license found in the LICENSE file.