mirror of
https://github.com/wneessen/go-mail.git
synced 2024-11-09 15:32:54 +01:00
Add EML parsing functionality to mail package
Added two new functions `EMLToMsg` and `readEML` to the `mail` package. `EMLToMsg` function opens and parses a .eml file and returns a pre-filled Msg pointer. `readEML` opens an EML file and uses net/mail to parse the header and body. These changes are made to provide support for EML file parsing, which is a common requirement in many email-based applications.
This commit is contained in:
parent
0bd5390e37
commit
d8d2a6e714
1 changed files with 97 additions and 0 deletions
97
eml.go
Normal file
97
eml.go
Normal file
|
@ -0,0 +1,97 @@
|
|||
package mail
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
nm "net/mail"
|
||||
"os"
|
||||
)
|
||||
|
||||
// EMLToMsg will open an parse a .eml file at a provided file path and return a
|
||||
// pre-filled Msg pointer
|
||||
func EMLToMsg(fp string) (*Msg, error) {
|
||||
m := &Msg{
|
||||
addrHeader: make(map[AddrHeader][]*nm.Address),
|
||||
genHeader: make(map[Header][]string),
|
||||
preformHeader: make(map[Header]string),
|
||||
mimever: Mime10,
|
||||
}
|
||||
|
||||
pm, err := readEML(fp)
|
||||
if err != nil || pm == nil {
|
||||
return m, fmt.Errorf("failed to parse EML file: %w", err)
|
||||
}
|
||||
|
||||
if err := parseEMLHeaders(&pm.Header, m); err != nil {
|
||||
return m, fmt.Errorf("failed to parse EML headers: %w", err)
|
||||
}
|
||||
|
||||
return m, nil
|
||||
}
|
||||
|
||||
// readEML opens an EML file and uses net/mail to parse the header and body
|
||||
func readEML(fp string) (*nm.Message, error) {
|
||||
fh, err := os.Open(fp)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to open EML file: %w", err)
|
||||
}
|
||||
defer func() {
|
||||
_ = fh.Close()
|
||||
}()
|
||||
pm, err := nm.ReadMessage(fh)
|
||||
if err != nil {
|
||||
return pm, fmt.Errorf("failed to parse EML: %w", err)
|
||||
}
|
||||
return pm, nil
|
||||
}
|
||||
|
||||
func parseEMLHeaders(mh *nm.Header, m *Msg) error {
|
||||
commonHeaders := []Header{
|
||||
HeaderContentType, HeaderImportance, HeaderInReplyTo, HeaderListUnsubscribe,
|
||||
HeaderListUnsubscribePost, HeaderMessageID, HeaderMIMEVersion, HeaderOrganization,
|
||||
HeaderPrecedence, HeaderPriority, HeaderSubject, HeaderUserAgent, HeaderXMailer,
|
||||
HeaderXMSMailPriority, HeaderXPriority,
|
||||
}
|
||||
|
||||
// Extract address headers
|
||||
if v := mh.Get(HeaderFrom.String()); v != "" {
|
||||
if err := m.From(v); err != nil {
|
||||
return fmt.Errorf(`failed to parse "From:" header: %w`, err)
|
||||
}
|
||||
}
|
||||
if v := mh.Get(HeaderTo.String()); v != "" {
|
||||
var als []string
|
||||
pal, err := nm.ParseAddressList(v)
|
||||
if err != nil {
|
||||
return fmt.Errorf(`failed to parse address list: %w`, err)
|
||||
}
|
||||
for _, a := range pal {
|
||||
als = append(als, a.String())
|
||||
}
|
||||
if err := m.To(als...); err != nil {
|
||||
return fmt.Errorf(`failed to parse "To:" header: %w`, err)
|
||||
}
|
||||
}
|
||||
|
||||
// Extract date from message
|
||||
d, err := mh.Date()
|
||||
if err != nil {
|
||||
switch {
|
||||
case errors.Is(err, nm.ErrHeaderNotPresent):
|
||||
m.SetDate()
|
||||
default:
|
||||
return fmt.Errorf("failed to parse EML date: %w", err)
|
||||
}
|
||||
}
|
||||
if err == nil {
|
||||
m.SetDateWithValue(d)
|
||||
}
|
||||
|
||||
// Extract common headers
|
||||
for _, h := range commonHeaders {
|
||||
if v := mh.Get(h.String()); v != "" {
|
||||
m.SetGenHeader(h, v)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
Loading…
Reference in a new issue