go语言Base64解码遇到的坑

eyJhdF9oYXNoIjoiZXktaVFoY3NEUGdPR1pjTEh2MGJ4dyIsImF1ZCI6WyJhbm90aGVyLWNvbnN1bWVyNyJdLCJhdXRoX3RpbWUiOjE1NzgzNzg4NTAsImV4cCI6MTU3ODM4MjQ1MSwiaWF0IjoxNTc4Mzc4ODUxLCJpc3MiOiJodHRwOi8vMTcyLjE2LjIzLjE5OjkwMDAvIiwianRpIjoiMzk5NmI2ZjgtZmY5Mi00NWIzLWJkMzctYTBkZDVmNDlmYmNhIiwibm9uY2UiOiJmZ3J4YWtsb3pjcml0dmNnZ2d6b3p6ZXQiLCJyYXQiOjE1NzgzNzgyNjMsInNpZCI6ImQ3MGU0YzI5LTViZGYtNDczMy1hMmEzLTRlNDk4ZDM3OTI5ZSIsInN1YiI6ImFkbWluIn0

我们将上面一大串字符串在在线工具进行解码，发现ok，然后在编码发现会多一个“=”符号，使用go标准库里面的实例进行上面解码，发现错误

package main

import (
	"encoding/base64"
	"fmt"
)

func main() {

	fmt.Println(len("eyJhdF9oYXNoIjoiZXktaVFoY3NEUGdPR1pjTEh2MGJ4dyIsImF1ZCI6WyJhbm90aGVyLWNvbnN1bWVyNyJdLCJhdXRoX3RpbWUiOjE1NzgzNzg4NTAsImV4cCI6MTU3ODM4MjQ1MSwiaWF0IjoxNTc4Mzc4ODUxLCJpc3MiOiJodHRwOi8vMTcyLjE2LjIzLjE5OjkwMDAvIiwianRpIjoiMzk5NmI2ZjgtZmY5Mi00NWIzLWJkMzctYTBkZDVmNDlmYmNhIiwibm9uY2UiOiJmZ3J4YWtsb3pjcml0dmNnZ2d6b3p6ZXQiLCJyYXQiOjE1NzgzNzgyNjMsInNpZCI6ImQ3MGU0YzI5LTViZGYtNDczMy1hMmEzLTRlNDk4ZDM3OTI5ZSIsInN1YiI6ImFkbWluIn0"))
	_, err := base64.StdEncoding.DecodeString("eyJhdF9oYXNoIjoiZXktaVFoY3NEUGdPR1pjTEh2MGJ4dyIsImF1ZCI6WyJhbm90aGVyLWNvbnN1bWVyNyJdLCJhdXRoX3RpbWUiOjE1NzgzNzg4NTAsImV4cCI6MTU3ODM4MjQ1MSwiaWF0IjoxNTc4Mzc4ODUxLCJpc3MiOiJodHRwOi8vMTcyLjE2LjIzLjE5OjkwMDAvIiwianRpIjoiMzk5NmI2ZjgtZmY5Mi00NWIzLWJkMzctYTBkZDVmNDlmYmNhIiwibm9uY2UiOiJmZ3J4YWtsb3pjcml0dmNnZ2d6b3p6ZXQiLCJyYXQiOjE1NzgzNzgyNjMsInNpZCI6ImQ3MGU0YzI5LTViZGYtNDczMy1hMmEzLTRlNDk4ZDM3OTI5ZSIsInN1YiI6ImFkbWluIn0")
	fmt.Println(err)

}
报错信息如下：illegal base64 data at input byte 412

然后我在上面的字符串后面加上=，发现没有错误

然后发现一个新的方法，可以解决上面的问题

func main() {

	fmt.Println(len("eyJhdF9oYXNoIjoiZXktaVFoY3NEUGdPR1pjTEh2MGJ4dyIsImF1ZCI6WyJhbm90aGVyLWNvbnN1bWVyNyJdLCJhdXRoX3RpbWUiOjE1NzgzNzg4NTAsImV4cCI6MTU3ODM4MjQ1MSwiaWF0IjoxNTc4Mzc4ODUxLCJpc3MiOiJodHRwOi8vMTcyLjE2LjIzLjE5OjkwMDAvIiwianRpIjoiMzk5NmI2ZjgtZmY5Mi00NWIzLWJkMzctYTBkZDVmNDlmYmNhIiwibm9uY2UiOiJmZ3J4YWtsb3pjcml0dmNnZ2d6b3p6ZXQiLCJyYXQiOjE1NzgzNzgyNjMsInNpZCI6ImQ3MGU0YzI5LTViZGYtNDczMy1hMmEzLTRlNDk4ZDM3OTI5ZSIsInN1YiI6ImFkbWluIn0"))
	_, err := base64.RawStdEncoding.DecodeString("eyJhdF9oYXNoIjoiZXktaVFoY3NEUGdPR1pjTEh2MGJ4dyIsImF1ZCI6WyJhbm90aGVyLWNvbnN1bWVyNyJdLCJhdXRoX3RpbWUiOjE1NzgzNzg4NTAsImV4cCI6MTU3ODM4MjQ1MSwiaWF0IjoxNTc4Mzc4ODUxLCJpc3MiOiJodHRwOi8vMTcyLjE2LjIzLjE5OjkwMDAvIiwianRpIjoiMzk5NmI2ZjgtZmY5Mi00NWIzLWJkMzctYTBkZDVmNDlmYmNhIiwibm9uY2UiOiJmZ3J4YWtsb3pjcml0dmNnZ2d6b3p6ZXQiLCJyYXQiOjE1NzgzNzgyNjMsInNpZCI6ImQ3MGU0YzI5LTViZGYtNDczMy1hMmEzLTRlNDk4ZDM3OTI5ZSIsInN1YiI6ImFkbWluIn0")
	fmt.Println(err)

}

问题解决