Go and typescript difference base64 encoding problem-CodePudding

type script:

Buffer.from('Мегафон').toString('base64') //0JzQtdCz0LDRhNC 0L0=

go:

decode, err := base64.URLEncoding.DecodeString("0JzQtdCz0LDRhNC 0L0=") //err : illegal base64 data at input byte 15

if i try:

base64.URLEncoding.EncodeToString([]byte("Мегафон")) //0JzQtdCz0LDRhNC-0L0=

That is, the difference is only in and -.

I made it work with v = strings.ReplaceAll(v, " ", "-") but this is clearly not a solution.

CodePudding user response：

You are comparing "standard" base64 encoding with URL-safe base64 encoding. To use normal base64 encoding in Go don't use base64.URLEncoding.DecodeString but instead base64.StdEncoding.DecodeString.

CodePudding user response：

You encoded your string with standard base64 encoding, and decoded with url-safe decoder. Check out base64.go

// StdEncoding is the standard base64 encoding, as defined in
// RFC 4648.
var StdEncoding = NewEncoding(encodeStd)

// URLEncoding is the alternate base64 encoding defined in RFC 4648.
// It is typically used in URLs and file names.
var URLEncoding = NewEncoding(encodeURL)

This will works.

base64.StdEncoding.DecodeString("0JzQtdCz0LDRhNC 0L0=")

If you want to encode your string url-safely, use base64url instead of base64. Then you can decode the string with base64.URLEncoding.

 Buffer.from('Мегафон').toString('base64url'); //'0JzQtdCz0LDRhNC-0L0'