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package smtp
import (
"fmt"
"strings"
)
func parseCmd(line string) (cmd string, arg string, err error) {
line = strings.TrimRight(line, "\r\n")
l := len(line)
switch {
case strings.HasPrefix(strings.ToUpper(line), "STARTTLS"):
return "STARTTLS", "", nil
case l == 0:
return "", "", nil
case l < 4:
return "", "", fmt.Errorf("Command too short: %q", line)
case l == 4:
return strings.ToUpper(line), "", nil
case l == 5:
// Too long to be only command, too short to have args
return "", "", fmt.Errorf("Mangled command: %q", line)
}
// If we made it here, command is long enough to have args
if line[4] != ' ' {
// There wasn't a space after the command?
return "", "", fmt.Errorf("Mangled command: %q", line)
}
// I'm not sure if we should trim the args or not, but we will for now
//return strings.ToUpper(line[0:4]), strings.Trim(line[5:], " "), nil
return strings.ToUpper(line[0:4]), strings.Trim(line[5:], " \n\r"), nil
}
// Takes the arguments proceeding a command and files them
// into a map[string]string after uppercasing each key. Sample arg
// string:
//
// " BODY=8BITMIME SIZE=1024 SMTPUTF8"
//
// The leading space is mandatory.
func parseArgs(args []string) (map[string]string, error) {
argMap := map[string]string{}
for _, arg := range args {
if arg == "" {
continue
}
m := strings.Split(arg, "=")
switch len(m) {
case 2:
argMap[strings.ToUpper(m[0])] = m[1]
case 1:
argMap[strings.ToUpper(m[0])] = ""
default:
return nil, fmt.Errorf("Failed to parse arg string: %q", arg)
}
}
return argMap, nil
}
func parseHelloArgument(arg string) (string, error) {
domain := arg
if idx := strings.IndexRune(arg, ' '); idx >= 0 {
domain = arg[:idx]
}
if domain == "" {
return "", fmt.Errorf("Invalid domain")
}
return domain, nil
}
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