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email.go
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email.go
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package email
import (
"fmt"
"io"
"net/mail"
"strings"
"github.com/mnako/letters"
"golang.org/x/net/html"
)
type Address struct {
Email *mail.Address
Context AddressContext
}
type AddressContext int
const (
AddressContextNone AddressContext = iota
AddressContextFrom
AddressContextTo
AddressContextForwardedFrom
AddressContextForwardedTo
AddressContextMax
)
func (c *AddressContext) Set(val string) error {
*c = GetContext(val, false)
return nil
}
func (c AddressContext) String() string {
switch c {
case AddressContextNone:
return "None"
case AddressContextFrom:
return "From"
case AddressContextTo:
return "To"
case AddressContextForwardedFrom:
return "ForwardedFrom"
case AddressContextForwardedTo:
return "ForwardedTo"
default:
return "Unknown"
}
}
func GetContext(s string, forwarded bool) AddressContext {
m := strings.TrimSuffix(strings.ToLower(s), ":")
switch m {
case "from":
if forwarded {
return AddressContextForwardedFrom
}
return AddressContextFrom
case "to":
if forwarded {
return AddressContextForwardedTo
}
return AddressContextTo
case "forwardedfrom":
return AddressContextForwardedFrom
case "forwardedto":
return AddressContextForwardedTo
}
return AddressContextNone
}
func Parse(r io.Reader) (addresses [AddressContextMax][]Address, err error) {
email, err := letters.ParseEmail(r)
if err != nil {
return addresses, fmt.Errorf("failed to parse email: %e", err)
}
parsed, err := ParseHTML(email.HTML)
return parsed, err
}
func ParseHTML(htmlContent string) (addresses [AddressContextMax][]Address, err error) {
parsedHTML, err := html.Parse(strings.NewReader(htmlContent))
if err != nil {
return addresses, err
}
var f func(*html.Node) error
f = func(n *html.Node) error {
if n.Type == html.ElementNode && n.Data == "font" {
if n.FirstChild == nil || n.FirstChild.FirstChild == nil || n.FirstChild.NextSibling == nil {
return nil
}
fromTo := n.FirstChild.FirstChild.Data
context := GetContext(fromTo, true)
emailData := strings.TrimSpace(n.FirstChild.NextSibling.Data)
if context == AddressContextNone {
return nil
}
email, err := mail.ParseAddress(emailData)
if err != nil {
emailData = strings.Split(emailData, " ")[0]
email, err = mail.ParseAddress(emailData)
if err != nil {
return err
}
}
addresses[context] = append(addresses[context], Address{
Email: email,
Context: context,
})
return nil
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
if err := f(c); err != nil {
return err
}
}
return nil
}
err = f(parsedHTML)
return addresses, err
}