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address.go
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address.go
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package rfc5321
import (
"errors"
"net"
)
// Parse productions according to ABNF in RFC5322
type RFC5322 struct {
AddressList
Parser
addr SingleAddress
}
type AddressList struct {
List []SingleAddress
Group string
}
type SingleAddress struct {
DisplayName string
DisplayNameQuoted bool
LocalPart string
LocalPartQuoted bool
Domain string
IP net.IP
NullPath bool
}
var (
errNotAtom = errors.New("not atom")
errExpectingAngleAddress = errors.New("not angle address")
errNotAWord = errors.New("not a word")
errExpectingColon = errors.New("expecting : ")
errExpectingSemicolon = errors.New("expecting ; ")
errExpectingAngleClose = errors.New("expecting >")
errExpectingAngleOpen = errors.New("< expected")
errQuotedUnclosed = errors.New("quoted string not closed")
)
// Address parses the "address" production specified in RFC5322
// address = mailbox / group
func (s *RFC5322) Address(input []byte) (AddressList, error) {
s.set(input)
s.next()
s.List = nil
s.addr = SingleAddress{}
if err := s.mailbox(); err != nil {
if s.ch == ':' {
if groupErr := s.group(); groupErr != nil {
return s.AddressList, groupErr
} else {
err = nil
}
}
return s.AddressList, err
}
return s.AddressList, nil
}
// group = display-name ":" [group-List] ";" [CFWS]
func (s *RFC5322) group() error {
if s.addr.DisplayName == "" {
if err := s.displayName(); err != nil {
return err
}
} else {
s.Group = s.addr.DisplayName
s.addr.DisplayName = ""
}
if s.ch != ':' {
return errExpectingColon
}
s.next()
_ = s.groupList()
s.skipSpace()
if s.ch != ';' {
return errExpectingSemicolon
}
return nil
}
// mailbox = name-addr / addr-spec
func (s *RFC5322) mailbox() error {
pos := s.pos // save the position
if err := s.nameAddr(); err != nil {
if err == errExpectingAngleAddress && s.ch != ':' { // ':' means it's a group
// we'll attempt to parse as an email address without angle brackets
s.addr.DisplayName = ""
s.addr.DisplayNameQuoted = false
s.pos = pos - 1 //- 1 // rewind to the saved position
if s.pos > -1 {
s.ch = s.buf[s.pos]
}
if err = s.Parser.mailbox(); err != nil {
return err
}
s.addAddress()
} else {
return err
}
}
return nil
}
// addAddress ads the current address to the List
func (s *RFC5322) addAddress() {
s.addr.LocalPart = s.LocalPart
s.addr.LocalPartQuoted = s.LocalPartQuotes
s.addr.Domain = s.Domain
s.addr.IP = s.IP
s.List = append(s.List, s.addr)
s.addr = SingleAddress{}
}
// nameAddr consumes the name-addr production.
// name-addr = [display-name] angle-addr
func (s *RFC5322) nameAddr() error {
_ = s.displayName()
if s.ch == '<' {
if err := s.angleAddr(); err != nil {
return err
}
s.next()
if s.ch != '>' {
return errExpectingAngleClose
}
s.addAddress()
return nil
} else {
return errExpectingAngleAddress
}
}
// angleAddr consumes the angle-addr production
// angle-addr = [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr
func (s *RFC5322) angleAddr() error {
s.skipSpace()
if s.ch != '<' {
return errExpectingAngleOpen
}
// addr-spec = local-part "@" domain
if err := s.Parser.mailbox(); err != nil {
return err
}
s.skipSpace()
return nil
}
// displayName consumes the display-name production:
// display-name = phrase
// phrase = 1*word / obs-phrase
func (s *RFC5322) displayName() error {
defer func() {
if s.accept.Len() > 0 {
s.addr.DisplayName = s.accept.String()
s.accept.Reset()
}
}()
// phrase
if err := s.word(); err != nil {
return err
}
for {
err := s.word()
if err != nil {
return nil
}
}
}
// quotedString consumes a quoted-string production
func (s *RFC5322) quotedString() error {
if s.ch == '"' {
if err := s.Parser.QcontentSMTP(); err != nil {
return err
}
if s.ch != '"' {
return errQuotedUnclosed
} else {
// accept the "
s.next()
}
}
return nil
}
// word = atom / quoted-string
func (s *RFC5322) word() error {
if s.ch == '"' {
s.addr.DisplayNameQuoted = true
return s.quotedString()
} else if s.isAtext(s.ch) || s.ch == ' ' || s.ch == '\t' {
return s.atom()
}
return errNotAWord
}
// atom = [CFWS] 1*atext [CFWS]
func (s *RFC5322) atom() error {
s.skipSpace()
if !s.isAtext(s.ch) {
return errNotAtom
}
for {
if s.isAtext(s.ch) {
s.accept.WriteByte(s.ch)
s.next()
} else {
skipped := s.skipSpace()
if !s.isAtext(s.ch) {
return nil
}
if skipped > 0 {
s.accept.WriteByte(' ')
}
s.accept.WriteByte(s.ch)
s.next()
}
}
}
// groupList consumes the "group-List" production:
// group-List = mailbox-List / CFWS / obs-group-List
func (s *RFC5322) groupList() error {
// mailbox-list = (mailbox *("," mailbox))
if err := s.mailbox(); err != nil {
return err
}
s.next()
for {
s.skipSpace()
if s.ch != ',' {
return nil
}
s.next()
s.skipSpace()
if err := s.mailbox(); err != nil {
return err
}
s.next()
}
}
// skipSpace skips vertical space by calling next(), returning the count of spaces skipped
func (s *RFC5322) skipSpace() int {
var skipped int
for {
if s.ch != ' ' && s.ch != 9 {
return skipped
}
s.next()
skipped++
}
}