Add jsonschema subcmd

Author: cedws

go.mod

@@ -11,5 +11,7 @@ require (
 require (
 	github.com/alecthomas/repr v0.4.0 // indirect
 	github.com/hexops/gotextdiff v1.0.3 // indirect
+	github.com/swaggest/jsonschema-go v0.3.78 // indirect
+	github.com/swaggest/refl v1.4.0 // indirect
 	golang.org/x/sys v0.35.0 // indirect
 )

go.sum

@@ -6,6 +6,10 @@ github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc
 github.com/alecthomas/repr v0.4.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
 github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
+github.com/swaggest/jsonschema-go v0.3.78 h1:5+YFQrLxOR8z6CHvgtZc42WRy/Q9zRQQ4HoAxlinlHw=
+github.com/swaggest/jsonschema-go v0.3.78/go.mod h1:4nniXBuE+FIGkOGuidjOINMH7OEqZK3HCSbfDuLRI0g=
+github.com/swaggest/refl v1.4.0 h1:CftOSdTqRqs100xpFOT/Rifss5xBV/CT0S/FN60Xe9k=
+github.com/swaggest/refl v1.4.0/go.mod h1:4uUVFVfPJ0NSX9FPwMPspeHos9wPFlCMGoPRllUbpvA=
 golang.org/x/crypto v0.41.0 h1:WKYxWedPGCTVVl5+WHSSrOBT0O8lx32+zxmHxijgXp4=
 golang.org/x/crypto v0.41.0/go.mod h1:pO5AFd7FA68rFak7rOAGVuygIISepHftHnr8dr6+sUc=
 golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=

pkg/cmd/cmd.go

@@ -10,21 +10,21 @@ import (
 type cli struct {
 	ListenAddr string `help:"Address to listen on" default:":2222"`
 	Config     string `help:"Path to JSON config file"`
+
+	Serve      serveCmd      `cmd:"" default:"1" help:"Start the server"`
+	JSONSchema jsonschemaCmd `cmd:"" name:"jsonschema" help:"Print config JSON schema"`
 }
 
-func (c *cli) Run() error {
+type serveCmd struct{}
+
+func (s *serveCmd) Run(c *cli) error {
 	config, err := sshgate.Open(c.Config)
 	if err != nil {
 		return err
 	}
 
 	server := sshgate.New(config, c.ListenAddr)
-
-	if err := server.ListenAndServe(context.Background()); err != nil {
-		return err
-	}
-
-	return nil
+	return server.ListenAndServe(context.Background())
 }
 
 func Execute() {

pkg/cmd/cmd_jsonschema.go

@@ -0,0 +1,25 @@
+package cmd
+
+import (
+	"encoding/json"
+	"log"
+	"os"
+
+	"github.com/cedws/sshgate/pkg/sshgate"
+	"github.com/swaggest/jsonschema-go"
+)
+
+type jsonschemaCmd struct{}
+
+func (j *jsonschemaCmd) Run() error {
+	reflector := jsonschema.Reflector{}
+	schema, err := reflector.Reflect(sshgate.Config{})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "  ")
+
+	return enc.Encode(schema)
+}