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<?php |
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2
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3
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declare(strict_types = 1); |
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4
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5
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namespace Sop\JWX\Util; |
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6
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7
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/** |
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8
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* Class offering Base64 encoding and decoding. |
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*/ |
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class Base64 |
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{ |
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/** |
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* Encode a string using base64url variant. |
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* |
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* @see https://en.wikipedia.org/wiki/Base64#URL_applications |
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*/ |
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171 |
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public static function urlEncode(string $data): string |
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{ |
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171 |
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return strtr(rtrim(self::encode($data), '='), '+/', '-_'); |
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} |
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22
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/** |
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* Decode a string using base64url variant. |
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* |
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* @see https://en.wikipedia.org/wiki/Base64#URL_applications |
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* |
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* @throws \UnexpectedValueException |
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*/ |
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29
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131 |
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public static function urlDecode(string $data): string |
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{ |
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131 |
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$data = strtr($data, '-_', '+/'); |
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32
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131 |
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switch (strlen($data) % 4) { |
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131 |
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case 0: |
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34
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78 |
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break; |
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35
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113 |
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case 2: |
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36
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81 |
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$data .= '=='; |
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37
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81 |
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break; |
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38
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68 |
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case 3: |
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39
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67 |
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$data .= '='; |
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40
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67 |
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break; |
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41
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default: |
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42
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1 |
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throw new \UnexpectedValueException( |
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43
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1 |
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'Malformed base64url encoding.'); |
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44
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} |
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45
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130 |
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return self::decode($data); |
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46
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} |
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47
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48
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/** |
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49
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* Check whether string is validly base64url encoded. |
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50
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* |
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51
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* @see https://en.wikipedia.org/wiki/Base64#URL_applications |
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52
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*/ |
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53
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141 |
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public static function isValidURLEncoding(string $data): bool |
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54
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{ |
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55
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141 |
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return 1 === preg_match('#^[A-Za-z0-9\-_]*$#', $data); |
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56
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} |
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57
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58
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/** |
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* Encode a string in base64. |
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60
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* |
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61
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* @see https://tools.ietf.org/html/rfc4648#section-4 |
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62
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*/ |
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63
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174 |
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public static function encode(string $data): string |
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64
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{ |
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65
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174 |
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return base64_encode($data); |
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66
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} |
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67
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68
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/** |
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69
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* Decode a string from base64 encoding. |
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70
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* |
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71
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* @see https://tools.ietf.org/html/rfc4648#section-4 |
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72
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* |
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73
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* @throws \RuntimeException If decoding fails |
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74
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*/ |
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75
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132 |
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public static function decode(string $data): string |
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76
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{ |
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132 |
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$ret = base64_decode($data, true); |
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78
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132 |
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if (!is_string($ret)) { |
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79
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1 |
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$err = error_get_last(); |
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80
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1 |
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$msg = isset($err) && __FILE__ === $err['file'] ? $err['message'] : null; |
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81
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1 |
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throw new \RuntimeException($msg ?? 'base64_decode() failed.'); |
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82
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} |
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83
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131 |
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return $ret; |
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84
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} |
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85
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86
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/** |
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87
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* Check whether string is validly base64 encoded. |
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88
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* |
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89
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* @see https://tools.ietf.org/html/rfc4648#section-4 |
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90
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*/ |
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91
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7 |
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public static function isValid(string $data): bool |
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92
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{ |
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93
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7 |
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return 1 === preg_match('#^[A-Za-z0-9+/]*={0,2}$#', $data); |
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94
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} |
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95
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} |
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96
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sop /
jwx
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