EncodingUtils (RestFB 2025.3.0 API)

java.lang.Object
- com.restfb.util.EncodingUtils

```
public final class EncodingUtils
extends Object
```
A collection of data-encoding utility methods.

Since:

1.6.13

Author:

Josef Gierbl, Mikael Grev, Mark Allen

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static byte[]`	`decodeBase64(String base64)`	Decodes a base64-encoded string, padding out if necessary.
`static String`	`encodeAppSecretProof(String appSecret, String accessToken)`	Generates an appsecret_proof for facebook.
`static byte[]`	`encodeHex(byte[] data)`	Encodes a hex `byte[]` from given `byte[]`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - decodeBase64
```
public static byte[] decodeBase64(String base64)
```
    Decodes a base64-encoded string, padding out if necessary.
    
    Parameters:
    
    base64 - The base64-encoded string to decode.
    
    Returns:
    
    A decoded version of base64.
    
    Throws:
    
    NullPointerException - If base64 is null.
  - encodeHex
```
public static byte[] encodeHex(byte[] data)
```
    Encodes a hex byte[] from given byte[].
    This function is equivalent to Apache commons-codec binary new Hex().encode(byte[])
    
    Parameters:
    
    data - The data to encode as hex.
    
    Returns:
    
    Hex-encoded byte[]
    
    Throws:
    
    NullPointerException - If data is null.
  - encodeAppSecretProof
```
public static String encodeAppSecretProof(String appSecret,
                                          String accessToken)
```
    Generates an appsecret_proof for facebook.
    See https://developers.facebook.com/docs/graph-api/securing-requests for more info
    
    Parameters:
    
    appSecret - The facebook application secret
    
    accessToken - The facebook access token
    
    Returns:
    
    A Hex encoded SHA256 Hash as a String