Go example code for flexible decoding of unpadded URL encoded base64 and std encoding

bas64_decode.go

package main

import "fmt"
import "encoding/base64"
import "bytes"

var suspiciousBase64 = []byte(`OSEeu8fWTcq+AliFG3PlZ0eYR8zFWWAdkCwb3XbPE96wvAsiF1W6v2Udg5KoDe7M2d0oQMmpoNeC
ZQWRMBHarz5vHzfTSXXCjvoLfZJVA1FLiJ9RYk8ulFyEJF19nxd2GLArnWjiqsP9RslhFB3BvYnZ
O9IsuyRqWKpa1nl5B68=`)

func main() {
	decoded,err := decodeUnpaddedBase64(suspiciousBase64, false)
	if err != nil {
		fmt.Printf("could not process value: `%s`", err)
	} else {
		fmt.Printf("it worked! %d", len(decoded))
	}
}

var padding = []byte("=")

func decodeUnpaddedBase64(incoming []byte, isURLEncoded bool) (decoded []byte, err error) {


	decoded = make([]byte, len(incoming))

	if isURLEncoded {
		if m := len(incoming) % 4; m != 0 {
			paddingBytes := bytes.Repeat(padding, 4-m)
			incoming = append(incoming, paddingBytes[:]...)
		}
		_,err = base64.URLEncoding.Decode(decoded, incoming)
	} else {
		_,err = base64.StdEncoding.Decode(decoded, incoming)
	}
	if(err != nil){
		return
	}

	return
}

I thought this code would be handy for folks who are getting errors about: illegal base64 data at input byte 2, etc.