Create public key from modulus and exponent in Golang

I fetched from the first certificate on: https://www.googleapis.com/oauth2/v2/certs the 'n' and 'e' key values. Is there a package in Go that can build a public key with 'n' and 'e'? I don't know how it's done using the crypto/rsa package. Some code would be precious. Thank You.

The rsa package has a PublicKey type with fields N and E. It should be pretty straightforward to decode the parts as described in the JWA draft.

Here is some quickly hacked code (Playground):

package main

import (
	"bytes"
	"crypto/rsa"
	"encoding/base64"
	"encoding/binary"
	"fmt"
	"math/big"
)

func main() {
	nStr := "AN+7p8kw1A3LXfAJi+Ui4o8F8G0EeB4B5RuufglWa4AkadDaLTxGLNtY/NtyRZBfwhdAmRjKQJTVgn5j3y0s+j/bvpzMktoVeHB7irOhxDnZJdIxNNMY3nUKBgQB81jg8lNTeBrJqELSJiRXQIe5PyWJWwQJ1XrtfQNcwGkICM1L"
	decN, err := base64.StdEncoding.DecodeString(nStr)
	if err != nil {
		fmt.Println(err)
		return
	}
	n := big.NewInt(0)
	n.SetBytes(decN)

	eStr := "AQAB"
	decE, err := base64.StdEncoding.DecodeString(eStr)
	if err != nil {
		fmt.Println(err)
		return
	}
	var eBytes []byte
	if len(decE) < 8 {
		eBytes = make([]byte, 8-len(decE), 8)
		eBytes = append(eBytes, decE...)
	} else {
		eBytes = decE
	}
	eReader := bytes.NewReader(eBytes)
	var e uint64
	err = binary.Read(eReader, binary.BigEndian, &e)
	if err != nil {
		fmt.Println(err)
		return
	}
	pKey := rsa.PublicKey{N: n, E: int(e)}
}