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package commandargs
import (
"errors"
"os"
"regexp"
"github.com/mattn/go-shellwords"
)
type CommandType string
const (
Discover CommandType = "discover"
TwoFactorRecover CommandType = "2fa_recovery_codes"
LfsAuthenticate CommandType = "git-lfs-authenticate"
ReceivePack CommandType = "git-receive-pack"
UploadPack CommandType = "git-upload-pack"
UploadArchive CommandType = "git-upload-archive"
)
var (
whoKeyRegex = regexp.MustCompile(`\bkey-(?P<keyid>\d+)\b`)
whoUsernameRegex = regexp.MustCompile(`\busername-(?P<username>\S+)\b`)
)
type CommandArgs struct {
GitlabUsername string
GitlabKeyId string
SshArgs []string
CommandType CommandType
}
func Parse(arguments []string) (*CommandArgs, error) {
if sshConnection := os.Getenv("SSH_CONNECTION"); sshConnection == "" {
return nil, errors.New("Only ssh allowed")
}
args := &CommandArgs{}
args.parseWho(arguments)
if err := args.parseCommand(os.Getenv("SSH_ORIGINAL_COMMAND")); err != nil {
return nil, errors.New("Invalid ssh command")
}
args.defineCommandType()
return args, 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) error {
args, err := shellwords.Parse(commandString)
if err != nil {
return err
}
// Handle Git for Windows 2.14 using "git upload-pack" instead of git-upload-pack
if len(args) > 1 && args[0] == "git" {
command := args[0] + "-" + args[1]
commandArgs := args[2:]
args = append([]string{command}, commandArgs...)
}
c.SshArgs = args
return nil
}
func (c *CommandArgs) defineCommandType() {
if len(c.SshArgs) == 0 {
c.CommandType = Discover
} else {
c.CommandType = CommandType(c.SshArgs[0])
}
}
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