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package lib
import (
"strings"
"github.com/emersion/go-message/mail"
)
// LimitHeaders returns a new Header with the specified headers included or
// excluded
func LimitHeaders(hdr *mail.Header, fields []string, exclude bool) *mail.Header {
fieldMap := make(map[string]struct{}, len(fields))
for _, f := range fields {
fieldMap[strings.ToLower(f)] = struct{}{}
}
nh := &mail.Header{}
curFields := hdr.Fields()
for curFields.Next() {
key := strings.ToLower(curFields.Key())
_, present := fieldMap[key]
// XOR exclude and present. When they are equal, it means we
// should not add the header to the new header struct
if exclude == present {
continue
}
nh.Add(key, curFields.Value())
}
return nh
}
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