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|
package email
import (
"bytes"
"net/mail"
"strings"
"github.com/jhillyerd/enmime"
)
type ParsedEmail struct {
MessageID string
FromAddress string
FromName string
ToAddresses []string
CcAddresses []string
BccAddresses []string
ReplyToAddress string
ReturnPath string
Subject string
Snippet string
Size int64
Attachments []ParsedAttachment
}
type ParsedAttachment struct {
Filename string
ContentType string
ContentID string
Size int64
IsInline bool
}
func Parse(rawMessage []byte) (*ParsedEmail, error) {
envelope, parseError := enmime.ReadEnvelope(bytes.NewReader(rawMessage))
if parseError != nil {
return nil, parseError
}
return &ParsedEmail{
MessageID: envelope.GetHeader("Message-ID"),
FromAddress: extractAddress(envelope.GetHeader("From")),
FromName: extractName(envelope.GetHeader("From")),
ToAddresses: extractAddressList(envelope.GetHeader("To")),
CcAddresses: extractAddressList(envelope.GetHeader("Cc")),
BccAddresses: extractAddressList(envelope.GetHeader("Bcc")),
ReplyToAddress: envelope.GetHeader("Reply-To"),
ReturnPath: envelope.GetHeader("Return-Path"),
Subject: envelope.GetHeader("Subject"),
Snippet: generateSnippet(envelope.Text),
Size: int64(len(rawMessage)),
Attachments: extractAttachments(envelope),
}, nil
}
func extractAddress(rawHeader string) string {
parsed, parseError := mail.ParseAddress(rawHeader)
if parseError != nil {
return rawHeader
}
return parsed.Address
}
func extractName(rawHeader string) string {
parsed, parseError := mail.ParseAddress(rawHeader)
if parseError != nil {
return ""
}
return parsed.Name
}
func extractAddressList(rawHeader string) []string {
if rawHeader == "" {
return nil
}
addresses, parseError := mail.ParseAddressList(rawHeader)
if parseError != nil {
return []string{rawHeader}
}
extracted := make([]string, len(addresses))
for index, address := range addresses {
extracted[index] = address.Address
}
return extracted
}
func generateSnippet(textBody string) string {
trimmed := strings.TrimSpace(textBody)
if len(trimmed) <= SnippetLength {
return trimmed
}
return trimmed[:SnippetLength]
}
func extractAttachments(envelope *enmime.Envelope) []ParsedAttachment {
var attachments []ParsedAttachment
for _, attachment := range envelope.Attachments {
attachments = append(attachments, ParsedAttachment{
Filename: attachment.FileName,
ContentType: attachment.ContentType,
ContentID: attachment.ContentID,
Size: int64(len(attachment.Content)),
IsInline: false,
})
}
for _, inline := range envelope.Inlines {
attachments = append(attachments, ParsedAttachment{
Filename: inline.FileName,
ContentType: inline.ContentType,
ContentID: inline.ContentID,
Size: int64(len(inline.Content)),
IsInline: true,
})
}
return attachments
}
|
