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| 1 | <?php declare(strict_types=1); |
| 2 | /** |
| 3 | * PrivateBin |
| 4 | * |
| 5 | * a zero-knowledge paste bin |
| 6 | * |
| 7 | * @link https://github.com/PrivateBin/PrivateBin |
| 8 | * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) |
| 9 | * @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License |
| 10 | */ |
| 11 | |
| 12 | namespace PrivateBin\Proxy; |
| 13 | |
| 14 | use Exception; |
| 15 | use PrivateBin\Configuration; |
| 16 | use PrivateBin\Json; |
| 17 | |
| 18 | /** |
| 19 | * AbstractProxy |
| 20 | * |
| 21 | * Forwards a URL for shortening and stores the result. |
| 22 | */ |
| 23 | abstract class AbstractProxy |
| 24 | { |
| 25 | /** |
| 26 | * error message |
| 27 | * |
| 28 | * @access private |
| 29 | * @var string |
| 30 | */ |
| 31 | private $_error = ''; |
| 32 | |
| 33 | /** |
| 34 | * shortened URL |
| 35 | * |
| 36 | * @access private |
| 37 | * @var string |
| 38 | */ |
| 39 | private $_url = ''; |
| 40 | |
| 41 | /** |
| 42 | * constructor |
| 43 | * |
| 44 | * initializes and runs the proxy class |
| 45 | * |
| 46 | * @access public |
| 47 | * @param Configuration $conf |
| 48 | * @param string $link |
| 49 | */ |
| 50 | public function __construct(Configuration $conf, string $link) |
| 51 | { |
| 52 | if (!filter_var($link, FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED | FILTER_FLAG_QUERY_REQUIRED)) { |
| 53 | $this->_error = 'Invalid URL given.'; |
| 54 | return; |
| 55 | } |
| 56 | |
| 57 | if (!str_starts_with($link, $conf->getKey('basepath') . '?') || |
| 58 | parse_url($link, PHP_URL_HOST) != parse_url($conf->getKey('basepath'), PHP_URL_HOST) |
| 59 | ) { |
| 60 | $this->_error = 'Trying to shorten a URL that isn\'t pointing at our instance.'; |
| 61 | return; |
| 62 | } |
| 63 | |
| 64 | $proxyUrl = $this->_getProxyUrl($conf); |
| 65 | |
| 66 | if (empty($proxyUrl)) { |
| 67 | $this->_error = 'Proxy error: Proxy URL is empty. This can be a configuration issue, like wrong or missing config keys.'; |
| 68 | $this->logErrorWithClassName($this->_error); |
| 69 | return; |
| 70 | } |
| 71 | |
| 72 | $data = file_get_contents($proxyUrl, false, |
| 73 | stream_context_create( |
| 74 | array( |
| 75 | 'http' => $this->_getProxyPayload($conf, $link), |
| 76 | ) |
| 77 | ) |
| 78 | ); |
| 79 | |
| 80 | if ($data === false) { |
| 81 | $http_response_header = $http_response_header ?? array(); |
| 82 | $statusCode = ''; |
| 83 | if (!empty($http_response_header) && preg_match('/HTTP\/\d+\.\d+\s+(\d+)/', $http_response_header[0], $matches)) { |
| 84 | $statusCode = $matches[1]; |
| 85 | } |
| 86 | $this->_error = 'Proxy error: Bad response. This can be a configuration issue, like wrong or missing config keys or a temporary outage.'; |
| 87 | $this->logErrorWithClassName($this->_error . ' Status code: ' . $statusCode); |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | try { |
| 92 | $jsonData = Json::decode($data); |
| 93 | } catch (Exception $e) { |
| 94 | $this->_error = 'Proxy error: Error parsing proxy response. This can be a configuration issue, like wrong or missing config keys.'; |
| 95 | $this->logErrorWithClassName('Error calling proxy: ' . $e->getMessage()); |
| 96 | return; |
| 97 | } |
| 98 | |
| 99 | $url = $this->_extractShortUrl($jsonData); |
| 100 | |
| 101 | if ($url === null || empty($url)) { |
| 102 | $this->_error = 'Proxy error: Error parsing proxy response. This can be a configuration issue, like wrong or missing config keys.'; |
| 103 | $this->logErrorWithClassName('Error calling proxy: ' . $data); |
| 104 | } else { |
| 105 | $this->_url = $url; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | private function logErrorWithClassName(string $error) |
| 110 | { |
| 111 | error_log('[' . get_class($this) . '] ' . $error); |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Returns the (untranslated) error message |
| 116 | * |
| 117 | * @access public |
| 118 | * @return string |
| 119 | */ |
| 120 | public function getError() |
| 121 | { |
| 122 | return $this->_error; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Returns the shortened URL |
| 127 | * |
| 128 | * @access public |
| 129 | * @return string |
| 130 | */ |
| 131 | public function getUrl() |
| 132 | { |
| 133 | return $this->_url; |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Returns true if any error has occurred |
| 138 | * |
| 139 | * @access public |
| 140 | * @return bool |
| 141 | */ |
| 142 | public function isError() |
| 143 | { |
| 144 | return !empty($this->_error); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Abstract method to get the payload to send to the URL shortener |
| 149 | * |
| 150 | * @access protected |
| 151 | * @param Configuration $conf |
| 152 | * @param string $link |
| 153 | * @return array |
| 154 | */ |
| 155 | abstract protected function _getProxyPayload(Configuration $conf, string $link): array; |
| 156 | |
| 157 | /** |
| 158 | * Abstract method to extract the shortUrl from the response |
| 159 | * |
| 160 | * @param array $data |
| 161 | * @return ?string |
| 162 | */ |
| 163 | abstract protected function _extractShortUrl(array $data): ?string; |
| 164 | |
| 165 | /** |
| 166 | * Abstract method to get the proxy URL |
| 167 | * |
| 168 | * @param Configuration $conf |
| 169 | * @return string |
| 170 | */ |
| 171 | abstract protected function _getProxyUrl(Configuration $conf): string; |
| 172 | } |