base64.go RawHistoryFolder

1package kittygraphics
2
3import (
4	"encoding/base64"
5	"fmt"
6)
7
8// DecodeBase64 accepts both padded standard base64 and unpadded raw standard
9// base64. It deliberately does not accept URL-safe alphabets or non-base64
10// whitespace other than the CR/LF ignored by the standard encoding.
11func DecodeBase64(encoded []byte) ([]byte, error) {
12	decoded, err := base64.StdEncoding.DecodeString(string(encoded))
13	if err == nil {
14		return decoded, nil
15	}
16	decoded, rawErr := base64.RawStdEncoding.DecodeString(string(encoded))
17	if rawErr == nil {
18		return decoded, nil
19	}
20	return nil, fmt.Errorf("%w: %v", ErrInvalidBase64, err)
21}
22
23// DecodePayload is a descriptive alias for DecodeBase64.
24func DecodePayload(encoded []byte) ([]byte, error) { return DecodeBase64(encoded) }