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| 1 | <?php declare(strict_types=1); |
| 2 | |
| 3 | namespace Taproot\IndieAuth\Storage; |
| 4 | |
| 5 | use DirectoryIterator; |
| 6 | use Exception; |
| 7 | use Psr\Log\LoggerAwareInterface; |
| 8 | use Psr\Log\LoggerInterface; |
| 9 | use Psr\Log\NullLogger; |
| 10 | use Taproot\IndieAuth\IndieAuthException; |
| 11 | |
| 12 | use function Taproot\IndieAuth\generateRandomString; |
| 13 | |
| 14 | /** |
| 15 | * Filesystem JSON Token Storage |
| 16 | * |
| 17 | * An implementation of `TokenStorageInterface` which stores authorization codes |
| 18 | * and access tokens in the filesystem as JSON files, and supports custom access |
| 19 | * token lifetimes. |
| 20 | * |
| 21 | * This is intended as a default, example implementation with minimal requirements. |
| 22 | * In practise, most people should probably be using an SQLite3 version of this |
| 23 | * which I haven’t written yet. I haven’t extensively documented this class, as it |
| 24 | * will likely be superceded by the SQLite version. |
| 25 | */ |
| 26 | class FilesystemJsonStorage implements TokenStorageInterface, LoggerAwareInterface { |
| 27 | const DEFAULT_AUTH_CODE_TTL = 60 * 5; // Five minutes. |
| 28 | const DEFAULT_ACCESS_TOKEN_TTL = 60 * 60 * 24 * 7; // One week. |
| 29 | |
| 30 | const TOKEN_LENGTH = 64; |
| 31 | |
| 32 | /** @var string $path */ |
| 33 | protected $path; |
| 34 | |
| 35 | /** @var int $authCodeTtl */ |
| 36 | protected $authCodeTtl; |
| 37 | |
| 38 | /** @var int $accessTokenTtl */ |
| 39 | protected $accessTokenTtl; |
| 40 | |
| 41 | /** @var string $secret */ |
| 42 | protected $secret; |
| 43 | |
| 44 | /** @var LoggerInterface $logger */ |
| 45 | protected $logger; |
| 46 | |
| 47 | public function __construct(string $path, string $secret, ?int $authCodeTtl=null, ?int $accessTokenTtl=null, $cleanUpNow=false, ?LoggerInterface $logger=null) { |
| 48 | $this->logger = $logger ?? new NullLogger(); |
| 49 | |
| 50 | if (strlen($secret) < 64) { |
| 51 | throw new Exception("\$secret must be a string with a minimum length of 64 characters. Make one with Taproot\IndieAuth\generateRandomString(64)"); |
| 52 | } |
| 53 | $this->secret = $secret; |
| 54 | |
| 55 | $this->path = rtrim($path, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR; |
| 56 | |
| 57 | $this->authCodeTtl = $authCodeTtl ?? self::DEFAULT_AUTH_CODE_TTL; |
| 58 | $this->accessTokenTtl = $accessTokenTtl ?? self::DEFAULT_ACCESS_TOKEN_TTL; |
| 59 | |
| 60 | @mkdir($this->path, 0777, true); |
| 61 | |
| 62 | if ($cleanUpNow) { |
| 63 | $this->deleteExpiredTokens(); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | // LoggerAwareInterface method. |
| 68 | |
| 69 | public function setLogger(LoggerInterface $logger) { |
| 70 | $this->logger = $logger; |
| 71 | } |
| 72 | |
| 73 | // TokenStorageInterface Methods. |
| 74 | |
| 75 | public function createAuthCode(array $data): ?string { |
| 76 | $this->logger->info("Creating authorization code.", $data); |
| 77 | $authCode = generateRandomString(self::TOKEN_LENGTH); |
| 78 | $accessToken = $this->hash($authCode); |
| 79 | |
| 80 | // TODO: valid_until should be expire_after(? — look up), and should not be set here, |
| 81 | // as it applies only to access tokens, not auth codes! Auth code TTL should always be |
| 82 | // the default. |
| 83 | if (!array_key_exists('valid_until', $data)) { |
| 84 | $data['valid_until'] = time() + $this->authCodeTtl; |
| 85 | } |
| 86 | |
| 87 | if (!$this->put($accessToken, $data)) { |
| 88 | return null; |
| 89 | } |
| 90 | return $authCode; |
| 91 | } |
| 92 | |
| 93 | public function exchangeAuthCodeForAccessToken(string $code, callable $validateAuthCode): ?array { |
| 94 | // Hash the auth code to get the theoretical matching access token filename. |
| 95 | $accessToken = $this->hash($code); |
| 96 | |
| 97 | // Prevent the token file from being read, modified or deleted while we’re working with it. |
| 98 | // r+ to allow reading and writing, but to make sure we don’t create the file if it doesn’t |
| 99 | // already exist. |
| 100 | return $this->withLock($this->getPath($accessToken), 'r+', function ($fp) use ($accessToken, $validateAuthCode) { |
| 101 | // Read the file contents. |
| 102 | $fileContents = ''; |
| 103 | while ($d = fread($fp, 1024)) { $fileContents .= $d; } |
| 104 | |
| 105 | $data = json_decode($fileContents, true); |
| 106 | |
| 107 | if (!is_array($data)) { |
| 108 | $this->logger->error('Authoriazation Code data could not be parsed as a JSON object.'); |
| 109 | return null; |
| 110 | } |
| 111 | |
| 112 | // Make sure the auth code hasn’t already been redeemed. |
| 113 | if ($data['exchanged_at'] ?? false) { |
| 114 | $this->logger->error("This authorization code has already been exchanged."); |
| 115 | return null; |
| 116 | } |
| 117 | |
| 118 | // Make sure the auth code isn’t expired. |
| 119 | if (($data['valid_until'] ?? 0) < time()) { |
| 120 | $this->logger->error("This authorization code has expired."); |
| 121 | return null; |
| 122 | } |
| 123 | |
| 124 | // The auth code is valid as far as we know, pass it to the validation callback passed from the |
| 125 | // Server. |
| 126 | try { |
| 127 | $validateAuthCode($data); |
| 128 | } catch (IndieAuthException $e) { |
| 129 | // If there was an issue with the auth code, delete it before bubbling the exception |
| 130 | // up to the Server for handling. We currently have a lock on the file path, so pass |
| 131 | // false to $observeLock to prevent a deadlock. |
| 132 | $this->logger->info("Deleting authorization code, as it failed the Server-level validation."); |
| 133 | $this->delete($accessToken, false); |
| 134 | throw $e; |
| 135 | } |
| 136 | |
| 137 | // If the access token is valid, mark it as redeemed and set a new expiry time. |
| 138 | $data['exchanged_at'] = time(); |
| 139 | |
| 140 | if (is_int($data['_access_token_ttl'] ?? null)) { |
| 141 | // This access token has a custom TTL, use that. |
| 142 | $data['valid_until'] = time() + $data['_access_code_ttl']; |
| 143 | } elseif ($this->accessTokenTtl == 0) { |
| 144 | // The token should be valid until explicitly revoked. |
| 145 | $data['valid_until'] = null; |
| 146 | } else { |
| 147 | // Use the default TTL. |
| 148 | $data['valid_until'] = time() + $this->accessTokenTtl; |
| 149 | } |
| 150 | |
| 151 | // Write the new file contents, truncating afterwards in case the new data is shorter than the old data. |
| 152 | $jsonData = json_encode($data); |
| 153 | if (rewind($fp) === false) { return null; } |
| 154 | if (fwrite($fp, $jsonData) === false) { return null; } |
| 155 | if (ftruncate($fp, strlen($jsonData)) === false) { return null; } |
| 156 | |
| 157 | // Return the OAuth2-compatible access token data to the Server for passing onto |
| 158 | // the client app. Passed via array_filter to remove the scope key if scope is null. |
| 159 | return array_filter([ |
| 160 | 'access_token' => $accessToken, |
| 161 | 'scope' => $data['scope'] ?? null, |
| 162 | 'me' => $data['me'], |
| 163 | 'profile' => $data['profile'] ?? null |
| 164 | ]); |
| 165 | }); |
| 166 | } |
| 167 | |
| 168 | public function getAccessToken(string $token): ?array { |
| 169 | $data = $this->get($token); |
| 170 | |
| 171 | if (!is_array($data)) { |
| 172 | $this->logger->error("The access token could not be parsed as a JSON object."); |
| 173 | return null; |
| 174 | } |
| 175 | |
| 176 | // Check that this is a redeemed access token. |
| 177 | if (($data['exchanged_at'] ?? false) === false) { |
| 178 | $this->logger->error("This authorization code has not yet been exchanged for an access token."); |
| 179 | return null; |
| 180 | } |
| 181 | |
| 182 | // Check that the access token is still valid. valid_until=null means it should live until |
| 183 | // explicitly revoked. |
| 184 | if (is_int($data['valid_until']) && $data['valid_until'] < time()) { |
| 185 | $this->logger->error("This access token has expired."); |
| 186 | return null; |
| 187 | } |
| 188 | |
| 189 | // The token is valid! |
| 190 | return $data; |
| 191 | } |
| 192 | |
| 193 | public function revokeAccessToken(string $token): bool { |
| 194 | $this->logger->info("Deleting access token {$token}"); |
| 195 | return $this->delete($token); |
| 196 | } |
| 197 | |
| 198 | // Implementation-Specifc Methods. |
| 199 | |
| 200 | public function deleteExpiredTokens(): int { |
| 201 | $deleted = 0; |
| 202 | |
| 203 | foreach (new DirectoryIterator($this->path) as $fileInfo) { |
| 204 | if ($fileInfo->isFile() && $fileInfo->getExtension() == 'json') { |
| 205 | // Only delete files which we can lock. |
| 206 | $successfullyDeleted = $this->withLock($fileInfo->getPathname(), 'r', function ($fp) use ($fileInfo) { |
| 207 | // Read the file, check expiry date! Only unlink if file is expired. |
| 208 | $fileContents = ''; |
| 209 | while ($d = fread($fp, 1024)) { $fileContents .= $d; } |
| 210 | |
| 211 | $data = json_decode($fileContents, true); |
| 212 | |
| 213 | if (!is_array($data)) { return; } |
| 214 | |
| 215 | // If valid_until is a valid time, and is in the past, delete the token. |
| 216 | if (is_int($data['valid_until'] ?? null) && $data['valid_until'] < time()) { |
| 217 | return unlink($fileInfo->getPathname()); |
| 218 | } |
| 219 | }); |
| 220 | |
| 221 | if ($successfullyDeleted) { $deleted++; } |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | return $deleted; |
| 226 | } |
| 227 | |
| 228 | public function get(string $key): ?array { |
| 229 | $path = $this->getPath($key); |
| 230 | |
| 231 | if (!file_exists($path)) { |
| 232 | return null; |
| 233 | } |
| 234 | |
| 235 | return $this->withLock($path, 'r', function ($fp) { |
| 236 | $fileContents = ''; |
| 237 | while ($data = fread($fp, 1024)) { |
| 238 | $fileContents .= $data; |
| 239 | } |
| 240 | $result = json_decode($fileContents, true); |
| 241 | |
| 242 | if (is_array($result)) { |
| 243 | return $result; |
| 244 | } |
| 245 | |
| 246 | return null; |
| 247 | }); |
| 248 | } |
| 249 | |
| 250 | public function put(string $key, array $data): bool { |
| 251 | // Ensure that the containing folder exists. |
| 252 | @mkdir($this->path, 0777, true); |
| 253 | |
| 254 | return $this->withLock($this->getPath($key), 'w', function ($fp) use ($data) { |
| 255 | return fwrite($fp, json_encode($data)) !== false; |
| 256 | }); |
| 257 | } |
| 258 | |
| 259 | public function delete(string $key, $observeLock=true): bool { |
| 260 | $path = $this->getPath($key); |
| 261 | if (file_exists($path)) { |
| 262 | if ($observeLock) { |
| 263 | return $this->withLock($path, 'r', function ($fp) use ($path) { |
| 264 | return unlink($path); |
| 265 | }); |
| 266 | } else { |
| 267 | return unlink($path); |
| 268 | } |
| 269 | } |
| 270 | return false; |
| 271 | } |
| 272 | |
| 273 | public function getPath(string $key): string { |
| 274 | // TODO: ensure that the calculated path is a child of $this->path. |
| 275 | return $this->path . "$key.json"; |
| 276 | } |
| 277 | |
| 278 | protected function withLock(string $path, string $mode, callable $callback) { |
| 279 | $fp = @fopen($path, $mode); |
| 280 | |
| 281 | if ($fp === false) { |
| 282 | return null; |
| 283 | } |
| 284 | |
| 285 | // Wait for a lock. |
| 286 | if (flock($fp, LOCK_EX)) { |
| 287 | $return = null; |
| 288 | try { |
| 289 | // Perform whatever action on the file pointer. |
| 290 | $return = $callback($fp); |
| 291 | } finally { |
| 292 | // Regardless of what happens, release the lock. |
| 293 | flock($fp, LOCK_UN); |
| 294 | fclose($fp); |
| 295 | } |
| 296 | return $return; |
| 297 | } |
| 298 | // It wasn’t possible to get a lock. |
| 299 | return null; |
| 300 | } |
| 301 | |
| 302 | protected function hash(string $token): string { |
| 303 | return hash_hmac('sha256', $token, $this->secret); |
| 304 | } |
| 305 | } |