From ec08e27af21de399fc2f772e78947e2ee7a57879 Mon Sep 17 00:00:00 2001
From: zgfzgf <1901989065@qq.com>
Date: Tue, 1 Dec 2020 19:36:01 +0800
Subject: [PATCH] add base64 decode

---
 cmd/lotus-shed/commp.go | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/cmd/lotus-shed/commp.go b/cmd/lotus-shed/commp.go
index 9b0cab75d..6f7923c24 100644
--- a/cmd/lotus-shed/commp.go
+++ b/cmd/lotus-shed/commp.go
@@ -1,27 +1,55 @@
 package main
 
 import (
+	"encoding/base64"
 	"encoding/hex"
 	"fmt"
 
 	commcid "github.com/filecoin-project/go-fil-commcid"
 	"github.com/urfave/cli/v2"
+	"golang.org/x/xerrors"
 )
 
 var commpToCidCmd = &cli.Command{
 	Name:        "commp-to-cid",
+	Usage:       "Convert commP to Cid",
 	Description: "Convert a raw commP to a piece-Cid",
+	ArgsUsage:   "[data]",
+	Flags: []cli.Flag{
+		&cli.StringFlag{
+			Name:  "encoding",
+			Value: "base64",
+			Usage: "specify input encoding to parse",
+		},
+	},
 	Action: func(cctx *cli.Context) error {
 		if !cctx.Args().Present() {
 			return fmt.Errorf("must specify commP to convert")
 		}
 
-		dec, err := hex.DecodeString(cctx.Args().First())
-		if err != nil {
-			return fmt.Errorf("failed to decode input as hex string: %w", err)
+		var dec []byte
+		switch cctx.String("encoding") {
+		case "base64":
+			data, err := base64.StdEncoding.DecodeString(cctx.Args().First())
+			if err != nil {
+				return xerrors.Errorf("decoding base64 value: %w", err)
+			}
+			dec = data
+		case "hex":
+			data, err := hex.DecodeString(cctx.Args().First())
+			if err != nil {
+				return xerrors.Errorf("decoding hex value: %w", err)
+			}
+			dec = data
+		default:
+			return xerrors.Errorf("unrecognized encoding: %s", cctx.String("encoding"))
 		}
 
-		fmt.Println(commcid.PieceCommitmentV1ToCID(dec))
+		cid, err := commcid.PieceCommitmentV1ToCID(dec)
+		if err != nil {
+			return err
+		}
+		fmt.Println(cid)
 		return nil
 	},
 }