Add a util to decode base64 inputs

cmd/lotus-shed/base64.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"encoding/base64"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"github.com/filecoin-project/go-state-types/abi"
+
+	"github.com/filecoin-project/go-address"
+
+	"github.com/urfave/cli/v2"
+)
+
+var base64Cmd = &cli.Command{
+	Name:        "base64",
+	Description: "multiformats base64",
+	Flags: []cli.Flag{
+		&cli.BoolFlag{
+			Name:  "decodeAddr",
+			Value: false,
+			Usage: "Decode a base64 addr",
+		},
+		&cli.BoolFlag{
+			Name:  "decodeBig",
+			Value: false,
+			Usage: "Decode a base64 big",
+		},
+	},
+	Action: func(cctx *cli.Context) error {
+		var input io.Reader
+
+		if cctx.Args().Len() == 0 {
+			input = os.Stdin
+		} else {
+			input = strings.NewReader(cctx.Args().First())
+		}
+
+		bytes, err := ioutil.ReadAll(input)
+		if err != nil {
+			return nil
+		}
+
+		decoded, err := base64.RawStdEncoding.DecodeString(strings.TrimSpace(string(bytes)))
+		if err != nil {
+			return err
+		}
+
+		if cctx.Bool("decodeAddr") {
+			addr, err := address.NewFromBytes(decoded)
+			if err != nil {
+				return err
+			}
+
+			fmt.Println(addr)
+
+			return nil
+		}
+
+		if cctx.Bool("decodeBig") {
+			var val abi.TokenAmount
+			err = val.UnmarshalBinary(decoded)
+			if err != nil {
+				return err
+			}
+
+			fmt.Println(val)
+		}
+
+		return nil
+	},
+}

cmd/lotus-shed/main.go

@@ -16,6 +16,7 @@ func main() {
 	logging.SetLogLevel("*", "INFO")
 
 	local := []*cli.Command{
+		base64Cmd,
 		base32Cmd,
 		base16Cmd,
 		bitFieldCmd,