如何在 Go 中解码 base64 编码的 JSON

Question

I have a map of type map[string][]byte , now the value of []byte is base64 encoded. There's a JSON encoded in that []byte that I want to use further. Now I do this to decode the base64 []byte array.

Assume that my secretInfo looks like this

apiVersion: v1
kind: Secret
metadata:
  namespace: kube-system
  name: my-credentials
data:
  secret_account.json: SGVsbG8sIHBsYXlncm91bmQ= // My base64 encoded data(not real/Actual data)

bytes, _ := b64.StdEncoding.DecodeString(string(secretInfo.Data["secret_account.json"])) // Converting data
var privateKeyJSON map[string]interface{}
err := json.Unmarshal(bytes, &privateKeyJSON)
if err != nil {
        r.Logger.Infof("Failed to parse secret %v", err)
    }

Now, I pass the value of the JSON to other JSON as a string.

secretInfo.StringData["DecodedPrivateKeyJson"] = string(bytes)

It throws me an error saying, expected JSON in StringData.DecodedPrivateKeyJson.

What am I missing?

Answer 1

It seems there is some issue in your code above

1. You ignored the decode error
2. You have not provided the code for how you parse the secret info

Adding a sample code with few cases, Hope It Helps :)

package main

import (
    b64 "encoding/base64"
    "encoding/json"
    "fmt"
)

func main() {
    encodedJSONTestData := []string{
        "ewoiZmlyc3RuYW1lIjoiSmhvbiIsCiJsYXN0bmFtZSI6ICJEb2UiCn0=",
        "",
        "!@#$%rtgfdjkmyhm",
    }

    for i, encodedJSON := range encodedJSONTestData {
        fmt.Println("Case", i)
        bytes, err := b64.StdEncoding.DecodeString(encodedJSON) // Converting data
        
        if err!=nil{
            fmt.Println("Failed to Decode secret", err)
            continue
        }
        
        var privateKeyJSON map[string]interface{}
        err = json.Unmarshal(bytes, &privateKeyJSON)
        if err != nil {
            fmt.Println("Failed to parse secret", err)
            continue
        }

        fmt.Println("Success", privateKeyJSON)
    }
}

Go Playground

Updated same code to use []Byte to provide more clarity

Answer 2

I think the problem is in this line:

secretInfo.StringData["DecodedPrivateKeyJson"] = string(bytes)

Which probably it should be like this:

secretInfo.StringData["DecodedPrivateKeyJson"] = string(privateKeyJSON)

Or event better:

marshaledPrivateKeyJSON, _ := json.Marshal(privateKeyJSON)
secretInfo.StringData["DecodedPrivateKeyJson"] = string(marshaledPrivateKeyJSON)