examples/scope: small scope exploder command line tool (#3266)

this provides a small tool that breaks a scope into
its constituent parts

Change-Id: If011dd457a175eeb6e013a17d1aee4f3edfb8b0c

examples/scope/main.go

@@ -0,0 +1,31 @@
+// Copyright (C) 2019 Storj Labs, Inc.
+// See LICENSE for copying information.
+
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"storj.io/storj/lib/uplink"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("usage:", os.Args[0], "<scope>")
+		os.Exit(1)
+	}
+	scope, err := uplink.ParseScope(os.Args[1])
+	if err != nil {
+		fmt.Println("invalid scope:", err.Error())
+		os.Exit(1)
+	}
+	encaccess, err := scope.EncryptionAccess.Serialize()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("satellite: %s\napi key: %s\nenc access: %s\n",
+		scope.SatelliteAddr,
+		scope.APIKey.Serialize(),
+		encaccess)
+}