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package commandargs
import (
"errors"
"os"
"regexp"
)
type CommandType string
const (
Discover CommandType = "discover"
)
var (
whoKeyRegex = regexp.MustCompile(`\bkey-(?P<keyid>\d+)\b`)
whoUsernameRegex = regexp.MustCompile(`\busername-(?P<username>\S+)\b`)
)
type CommandArgs struct {
GitlabUsername string
GitlabKeyId string
SshCommand string
CommandType CommandType
}
func Parse(arguments []string) (*CommandArgs, error) {
if sshConnection := os.Getenv("SSH_CONNECTION"); sshConnection == "" {
return nil, errors.New("Only ssh allowed")
}
info := &CommandArgs{}
info.parseWho(arguments)
info.parseCommand(os.Getenv("SSH_ORIGINAL_COMMAND"))
return info, nil
}
func (c *CommandArgs) parseWho(arguments []string) {
for _, argument := range arguments {
if keyId := tryParseKeyId(argument); keyId != "" {
c.GitlabKeyId = keyId
break
}
if username := tryParseUsername(argument); username != "" {
c.GitlabUsername = username
break
}
}
}
func tryParseKeyId(argument string) string {
matchInfo := whoKeyRegex.FindStringSubmatch(argument)
if len(matchInfo) == 2 {
// The first element is the full matched string
// The second element is the named `keyid`
return matchInfo[1]
}
return ""
}
func tryParseUsername(argument string) string {
matchInfo := whoUsernameRegex.FindStringSubmatch(argument)
if len(matchInfo) == 2 {
// The first element is the full matched string
// The second element is the named `username`
return matchInfo[1]
}
return ""
}
func (c *CommandArgs) parseCommand(commandString string) {
c.SshCommand = commandString
if commandString == "" {
c.CommandType = Discover
}
}
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