feat: strip comments from addresses

pkg/message/header.go

@@ -19,7 +19,9 @@ package message
 
 import (
 	"mime"
+	"net/mail"
 	"net/textproto"
+	"regexp"
 	"strings"
 	"time"
 
@@ -139,3 +141,42 @@ func GetAttachmentHeader(att *pmapi.Attachment) textproto.MIMEHeader {
 
 	return h
 }
+
+var reEmailComment = regexp.MustCompile("[(][^)]*[)]") // nolint[gochecknoglobals]
+
+// parseAddressComment removes the comments completely even though they should be allowed
+// http://tools.wordtothewise.com/rfc/822
+// NOTE: This should be supported in go>1.10 but it seems it's not ¯\_(ツ)_/¯
+func parseAddressComment(raw string) string {
+	return reEmailComment.ReplaceAllString(raw, "")
+}
+
+func parseAddressList(val string) (addrs []*mail.Address, err error) {
+	addrs, err = mail.ParseAddressList(parseAddressComment(val))
+	if err == nil {
+		if addrs == nil {
+			addrs = []*mail.Address{}
+		}
+		return
+	}
+
+	// Probably missing encoding error -- try to at least parse addresses in brackets.
+	first := strings.Index(val, "<")
+	last := strings.LastIndex(val, ">")
+	if first < 0 || last < 0 || first >= last {
+		return
+	}
+	var addrList []string
+	open := first
+	for open < last && 0 <= open {
+		val = val[open:]
+		close := strings.Index(val, ">")
+		addrList = append(addrList, val[:close+1])
+		val = val[close:]
+		open = strings.Index(val, "<")
+		last = strings.LastIndex(val, ">")
+	}
+	val = strings.Join(addrList, ", ")
+
+	return mail.ParseAddressList(val)
+}