[WIP] add multibase binary

go.mod

@@ -6,4 +6,5 @@ require (
 	github.com/mr-tron/base58 v1.1.0
 	github.com/multiformats/go-base32 v0.0.3
 	github.com/multiformats/go-base36 v0.1.0
+	github.com/urfave/cli/v2 v2.3.0
 )

go.sum

@@ -1,6 +1,19 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/mr-tron/base58 v1.1.0 h1:Y51FGVJ91WBqCEabAi5OPUz38eAx8DakuAm5svLcsfQ=
 github.com/mr-tron/base58 v1.1.0/go.mod h1:xcD2VGqlgYjBdcBLw+TuYLr8afG+Hj8g2eTVqeSzSU8=
 github.com/multiformats/go-base32 v0.0.3 h1:tw5+NhuwaOjJCC5Pp82QuXbrmLzWg7uxlMFp8Nq/kkI=
 github.com/multiformats/go-base32 v0.0.3/go.mod h1:pLiuGC8y0QR3Ue4Zug5UzK9LjgbkL8NSQj0zQ5Nz/AA=
 github.com/multiformats/go-base36 v0.1.0 h1:JR6TyF7JjGd3m6FbLU2cOxhC0Li8z8dLNGQ89tUg4F4=
 github.com/multiformats/go-base36 v0.1.0/go.mod h1:kFGE83c6s80PklsHO9sRn2NCoffoRdUUOENyW/Vv6sM=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
+github.com/urfave/cli/v2 v2.3.0 h1:qph92Y649prgesehzOrQjdWyxFOp/QVM+6imKHad91M=
+github.com/urfave/cli/v2 v2.3.0/go.mod h1:LJmUH05zAU44vOAcrfzZQKsZbVcdbOG8rtL3/XcUArI=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

multibase/main.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"fmt"
+	"github.com/multiformats/go-multibase"
+	"io/ioutil"
+	"os"
+
+	"github.com/urfave/cli/v2"
+)
+
+func main() {
+	app := &cli.App{
+		Name:  "multibase",
+		Usage: "base encoding and transcoding tool",
+		Commands: []*cli.Command{
+			{
+				Name:      "encode",
+				ArgsUsage: "<base>",
+				Usage:     "encode data in multibase",
+				Flags: []cli.Flag{
+					&cli.PathFlag{
+						Name:    "input",
+						Aliases: []string{"i"},
+						Usage:   "the file that should be encoded",
+					},
+				},
+				Action: func(context *cli.Context) error {
+					if !context.Args().Present() || context.NArg() > 2 {
+						return cli.ShowCommandHelp(context, "")
+					}
+
+					p := context.Path("input")
+					if (p == "" && context.NArg() != 2) || (p != "" && context.NArg() != 1) {
+						return cli.ShowCommandHelp(context, "")
+					}
+
+					base, err := multibase.EncoderByName(context.Args().First())
+					if err != nil {
+						return err
+					}
+
+					if p != "" {
+						fileData, err := ioutil.ReadFile(p)
+						if err != nil {
+							return err
+						}
+						fmt.Println(base.Encode(fileData))
+						return nil
+					}
+
+					fmt.Println(base.Encode([]byte(context.Args().Get(1))))
+					return nil
+				},
+			},
+			{
+				Name:      "decode",
+				ArgsUsage: "<data>",
+				Usage:     "encode data in multibase",
+				Flags: []cli.Flag{
+					&cli.PathFlag{
+						Name:    "output",
+						Aliases: []string{"o"},
+						Usage:   "output decoded data to a file",
+					},
+				},
+				Action: func(context *cli.Context) error {
+					if context.NArg() != 1 {
+						return cli.ShowCommandHelp(context, "")
+					}
+
+					_, data, err := multibase.Decode(context.Args().First())
+					if err != nil {
+						return err
+					}
+
+					p := context.Path("output")
+					if p == "" {
+						fmt.Printf(string(data))
+						return nil
+					}
+					return ioutil.WriteFile(p, data, os.ModePerm)
+				},
+			},
+			{
+				Name:      "transcode",
+				ArgsUsage: "<new-base> <data>",
+				Usage:     "transcode multibase data",
+				Action: func(context *cli.Context) error {
+					if context.NArg() != 2 {
+						return cli.ShowCommandHelp(context, "")
+					}
+
+					newbase, err := multibase.EncoderByName(context.Args().Get(0))
+					if err != nil {
+						return err
+					}
+
+					_, data, err := multibase.Decode(context.Args().Get(1))
+					if err != nil {
+						return err
+					}
+
+					fmt.Println(newbase.Encode(data))
+					return nil
+				},
+			},
+		},
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		panic(err)
+	}
+}