package mail

import "github.com/emersion/go-message/mail"

Package mail implements reading and writing mail messages.

This package assumes that a mail message contains one or more text parts and zero or more attachment parts. Each text part represents a different version of the message content (e.g. a different type, a different language and so on).

RFC 5322 defines the Internet Message Format.

Index ¶

• func CreateSingleInlineWriter(w io.Writer, header Header) (io.WriteCloser, error)
• func GenerateMessageID() string
• type Address
• func (a *Address) String() string
• type AttachmentHeader
• func (h *AttachmentHeader) Filename() (string, error)
• func (h *AttachmentHeader) SetFilename(filename string)
• type Header
• func (h *Header) AddressList(key string) ([]*Address, error)
• func (h *Header) Date() (time.Time, error)
• func (h *Header) SetAddressList(key string, addrs []*Address)
• func (h *Header) SetDate(t time.Time)
• func (h *Header) SetSubject(s string)
• func (h *Header) Subject() (string, error)
• type InlineHeader
• type InlineWriter
• func (w *InlineWriter) Close() error
• func (w *InlineWriter) CreatePart(h InlineHeader) (io.WriteCloser, error)
• type Part
• type PartHeader
• type Reader
• func CreateReader(r io.Reader) (*Reader, error)
• func NewReader(e *message.Entity) *Reader
• func (r *Reader) Close() error
• func (r *Reader) NextPart() (*Part, error)
• type Writer
• func CreateWriter(w io.Writer, header Header) (*Writer, error)
• func (w *Writer) Close() error
• func (w *Writer) CreateAttachment(h AttachmentHeader) (io.WriteCloser, error)
• func (w *Writer) CreateInline() (*InlineWriter, error)
• func (w *Writer) CreateSingleInline(h InlineHeader) (io.WriteCloser, error)

Examples ¶

• Reader
• Writer

Functions ¶

func CreateSingleInlineWriter ¶

func CreateSingleInlineWriter(w io.Writer, header Header) (io.WriteCloser, error)

CreateSingleInlineWriter writes a mail header to w. The mail will contain a single inline part. The body of the part should be written to the returned io.WriteCloser. Only one single inline part should be written, use CreateWriter if you want multiple parts.

func GenerateMessageID ¶

func GenerateMessageID() string

Generates an RFC 2822-compliant Message-Id based on the informational draft "Recommendations for generating Message IDs", for lack of a better authoritative source.

Types ¶

type Address ¶

type Address mail.Address

Address represents a single mail address.

func (*Address) String ¶

func (a *Address) String() string

String formats the address as a valid RFC 5322 address. If the address's name contains non-ASCII characters the name will be rendered according to RFC 2047.

type AttachmentHeader ¶

type AttachmentHeader struct {
	message.Header
}

An AttachmentHeader represents an attachment's header.

func (*AttachmentHeader) Filename ¶

func (h *AttachmentHeader) Filename() (string, error)

Filename parses the attachment's filename.

func (*AttachmentHeader) SetFilename ¶

func (h *AttachmentHeader) SetFilename(filename string)

SetFilename formats the attachment's filename.

type Header ¶

type Header struct {
	message.Header
}

A Header is a mail header.

func (*Header) AddressList ¶

func (h *Header) AddressList(key string) ([]*Address, error)

AddressList parses the named header field as a list of addresses. If the header is missing, it returns nil.

func (*Header) Date ¶

func (h *Header) Date() (time.Time, error)

Date parses the Date header field.

func (*Header) SetAddressList ¶

func (h *Header) SetAddressList(key string, addrs []*Address)

SetAddressList formats the named header to the provided list of addresses.

func (*Header) SetDate ¶

func (h *Header) SetDate(t time.Time)

SetDate formats the Date header field.

func (*Header) SetSubject ¶

func (h *Header) SetSubject(s string)

SetSubject formats the Subject header field.

func (*Header) Subject ¶

func (h *Header) Subject() (string, error)

Subject parses the Subject header field. If there is an error, the raw field value is returned alongside the error.

type InlineHeader ¶

type InlineHeader struct {
	message.Header
}

A InlineHeader represents a message text header.

type InlineWriter ¶

type InlineWriter struct {
	// contains filtered or unexported fields
}

InlineWriter writes a mail message's text.

func (*InlineWriter) Close ¶

func (w *InlineWriter) Close() error

Close finishes the InlineWriter.

func (*InlineWriter) CreatePart ¶

func (w *InlineWriter) CreatePart(h InlineHeader) (io.WriteCloser, error)

CreatePart creates a new text part with the provided header. The body of the part should be written to the returned io.WriteCloser.

type Part ¶

type Part struct {
	Header PartHeader
	Body   io.Reader
}

A Part is either a mail text or an attachment. Header is either a InlineHeader or an AttachmentHeader.

type PartHeader ¶

type PartHeader interface {
	// Add adds the key, value pair to the header.
	Add(key, value string)
	// Del deletes the values associated with key.
	Del(key string)
	// Get gets the first value associated with the given key. If there are no
	// values associated with the key, Get returns "".
	Get(key string) string
	// Set sets the header entries associated with key to the single element
	// value. It replaces any existing values associated with key.
	Set(key, value string)
}

A PartHeader is a mail part header. It contains convenience functions to get and set header fields.

type Reader ¶

type Reader struct {
	Header Header
	// contains filtered or unexported fields
}

A Reader reads a mail message.

package main

import (
	"io"
	"io/ioutil"
	"log"

	"github.com/emersion/go-message/mail"
)

func main() {
	// Let's assume r is an io.Reader that contains a mail.
	var r io.Reader

	// Create a new mail reader
	mr, err := mail.CreateReader(r)
	if err != nil {
		log.Fatal(err)
	}

	// Read each mail's part
	for {
		p, err := mr.NextPart()
		if err == io.EOF {
			break
		} else if err != nil {
			log.Fatal(err)
		}

		switch h := p.Header.(type) {
		case *mail.InlineHeader:
			b, _ := ioutil.ReadAll(p.Body)
			log.Printf("Got text: %v\n", string(b))
		case *mail.AttachmentHeader:
			filename, _ := h.Filename()
			log.Printf("Got attachment: %v\n", filename)
		}
	}
}

func CreateReader ¶

func CreateReader(r io.Reader) (*Reader, error)

CreateReader reads a mail header from r and returns a new mail reader.

If the message uses an unknown transfer encoding or charset, CreateReader returns an error that verifies message.IsUnknownCharset, but also returns a Reader that can be used.

func NewReader ¶

func NewReader(e *message.Entity) *Reader

NewReader creates a new mail reader.

func (*Reader) Close ¶

func (r *Reader) Close() error

Close finishes the reader.

func (*Reader) NextPart ¶

func (r *Reader) NextPart() (*Part, error)

NextPart returns the next mail part. If there is no more part, io.EOF is returned as error.

The returned Part.Body must be read completely before the next call to NextPart, otherwise it will be discarded.

If the part uses an unknown transfer encoding or charset, NextPart returns an error that verifies message.IsUnknownCharset, but also returns a Part that can be used.

type Writer ¶

type Writer struct {
	// contains filtered or unexported fields
}

A Writer writes a mail message. A mail message contains one or more text parts and zero or more attachments.

package main

import (
	"bytes"
	"io"
	"log"
	"time"

	"github.com/emersion/go-message/mail"
)

func main() {
	var b bytes.Buffer

	from := []*mail.Address{{"Mitsuha Miyamizu", "mitsuha.miyamizu@example.org"}}
	to := []*mail.Address{{"Taki Tachibana", "taki.tachibana@example.org"}}

	// Create our mail header
	var h mail.Header
	h.SetDate(time.Now())
	h.SetAddressList("From", from)
	h.SetAddressList("To", to)

	// Create a new mail writer
	mw, err := mail.CreateWriter(&b, h)
	if err != nil {
		log.Fatal(err)
	}

	// Create a text part
	tw, err := mw.CreateInline()
	if err != nil {
		log.Fatal(err)
	}
	var th mail.InlineHeader
	th.Set("Content-Type", "text/plain")
	w, err := tw.CreatePart(th)
	if err != nil {
		log.Fatal(err)
	}
	io.WriteString(w, "Who are you?")
	w.Close()
	tw.Close()

	// Create an attachment
	var ah mail.AttachmentHeader
	ah.Set("Content-Type", "image/jpeg")
	ah.SetFilename("picture.jpg")
	w, err = mw.CreateAttachment(ah)
	if err != nil {
		log.Fatal(err)
	}
	// TODO: write a JPEG file to w
	w.Close()

	mw.Close()

	log.Println(b.String())
}

func CreateWriter ¶

func CreateWriter(w io.Writer, header Header) (*Writer, error)

CreateWriter writes a mail header to w and creates a new Writer.

func (*Writer) Close ¶

func (w *Writer) Close() error

Close finishes the Writer.

func (*Writer) CreateAttachment ¶

func (w *Writer) CreateAttachment(h AttachmentHeader) (io.WriteCloser, error)

CreateAttachment creates a new attachment with the provided header. The body of the part should be written to the returned io.WriteCloser.

func (*Writer) CreateInline ¶

func (w *Writer) CreateInline() (*InlineWriter, error)

CreateInline creates a InlineWriter. One or more parts representing the same text in different formats can be written to a InlineWriter.

func (*Writer) CreateSingleInline ¶

func (w *Writer) CreateSingleInline(h InlineHeader) (io.WriteCloser, error)

CreateSingleInline creates a new single text part with the provided header. The body of the part should be written to the returned io.WriteCloser. Only one single text part should be written, use CreateInline if you want multiple text parts.

Source Files ¶

address.go attachment.go header.go inline.go mail.go reader.go writer.go