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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.
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1 changed files with 97 additions and 0 deletions
97
eml.go
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97
eml.go
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package mail
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import (
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"errors"
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"fmt"
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nm "net/mail"
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"os"
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)
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// EMLToMsg will open an parse a .eml file at a provided file path and return a
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// pre-filled Msg pointer
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func EMLToMsg(fp string) (*Msg, error) {
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m := &Msg{
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addrHeader: make(map[AddrHeader][]*nm.Address),
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genHeader: make(map[Header][]string),
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preformHeader: make(map[Header]string),
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mimever: Mime10,
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}
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pm, err := readEML(fp)
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if err != nil || pm == nil {
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return m, fmt.Errorf("failed to parse EML file: %w", err)
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}
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if err := parseEMLHeaders(&pm.Header, m); err != nil {
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return m, fmt.Errorf("failed to parse EML headers: %w", err)
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}
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return m, nil
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}
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// readEML opens an EML file and uses net/mail to parse the header and body
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func readEML(fp string) (*nm.Message, error) {
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fh, err := os.Open(fp)
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if err != nil {
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return nil, fmt.Errorf("failed to open EML file: %w", err)
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}
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defer func() {
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_ = fh.Close()
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}()
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pm, err := nm.ReadMessage(fh)
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if err != nil {
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return pm, fmt.Errorf("failed to parse EML: %w", err)
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}
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return pm, nil
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}
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func parseEMLHeaders(mh *nm.Header, m *Msg) error {
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commonHeaders := []Header{
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HeaderContentType, HeaderImportance, HeaderInReplyTo, HeaderListUnsubscribe,
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HeaderListUnsubscribePost, HeaderMessageID, HeaderMIMEVersion, HeaderOrganization,
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HeaderPrecedence, HeaderPriority, HeaderSubject, HeaderUserAgent, HeaderXMailer,
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HeaderXMSMailPriority, HeaderXPriority,
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}
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// Extract address headers
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if v := mh.Get(HeaderFrom.String()); v != "" {
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if err := m.From(v); err != nil {
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return fmt.Errorf(`failed to parse "From:" header: %w`, err)
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}
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}
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if v := mh.Get(HeaderTo.String()); v != "" {
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var als []string
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pal, err := nm.ParseAddressList(v)
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if err != nil {
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return fmt.Errorf(`failed to parse address list: %w`, err)
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}
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for _, a := range pal {
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als = append(als, a.String())
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}
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if err := m.To(als...); err != nil {
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return fmt.Errorf(`failed to parse "To:" header: %w`, err)
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}
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}
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// Extract date from message
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d, err := mh.Date()
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if err != nil {
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switch {
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case errors.Is(err, nm.ErrHeaderNotPresent):
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m.SetDate()
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default:
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return fmt.Errorf("failed to parse EML date: %w", err)
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}
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}
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if err == nil {
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m.SetDateWithValue(d)
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}
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// Extract common headers
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for _, h := range commonHeaders {
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if v := mh.Get(h.String()); v != "" {
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m.SetGenHeader(h, v)
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}
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}
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return nil
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}
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