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util.go
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/
util.go
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package backends
import (
"bytes"
"compress/zlib"
"crypto/md5"
"fmt"
"io"
"net/textproto"
"regexp"
"strings"
)
// First capturing group is header name, second is header value.
// Accounts for folding headers.
var headerRegex, _ = regexp.Compile(`^([\S ]+):([\S ]+(?:\r\n\s[\S ]+)?)`)
// ParseHeaders is deprecated, see mail.Envelope.ParseHeaders instead
func ParseHeaders(mailData string) map[string]string {
var headerSectionEnds int
for i, char := range mailData[:len(mailData)-4] {
if char == '\r' {
if mailData[i+1] == '\n' && mailData[i+2] == '\r' && mailData[i+3] == '\n' {
headerSectionEnds = i + 2
}
}
}
headers := make(map[string]string)
matches := headerRegex.FindAllStringSubmatch(mailData[:headerSectionEnds], -1)
for _, h := range matches {
name := textproto.CanonicalMIMEHeaderKey(strings.TrimSpace(strings.Replace(h[1], "\r\n", "", -1)))
val := strings.TrimSpace(strings.Replace(h[2], "\r\n", "", -1))
headers[name] = val
}
return headers
}
// returns an md5 hash as string of hex characters
func MD5Hex(stringArguments ...string) string {
h := md5.New()
var r *strings.Reader
for i := 0; i < len(stringArguments); i++ {
r = strings.NewReader(stringArguments[i])
_, _ = io.Copy(h, r)
}
sum := h.Sum([]byte{})
return fmt.Sprintf("%x", sum)
}
// concatenate & compress all strings passed in
func Compress(stringArguments ...string) string {
var b bytes.Buffer
var r *strings.Reader
w, _ := zlib.NewWriterLevel(&b, zlib.BestSpeed)
for i := 0; i < len(stringArguments); i++ {
r = strings.NewReader(stringArguments[i])
_, _ = io.Copy(w, r)
}
_ = w.Close()
return b.String()
}