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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** @license For full copyright and license information, please see the LICENSE.md file. */ |
| 6 | |
| 7 | namespace App\Modules\Map\Infrastructure\GeoIp; |
| 8 | |
| 9 | defined('AMMONLY_APP') || exit('Direct script access is forbidden.'); |
| 10 | |
| 11 | use App\Modules\Map\Domain\Model\IpLocationDto; |
| 12 | use App\Modules\Map\Domain\Repository\MaxMindMmdbReaderInterface; |
| 13 | use RuntimeException; |
| 14 | use Throwable; |
| 15 | |
| 16 | /** |
| 17 | * Pure PHP reader for MaxMind DB 2.0 binary database format (GeoLite2-City.mmdb). |
| 18 | * |
| 19 | * Implements binary search tree traversal and data decoding without external C extensions. |
| 20 | * |
| 21 | * @package App\Modules\Map\Infrastructure\GeoIp |
| 22 | */ |
| 23 | final class MaxMindMmdbReader implements MaxMindMmdbReaderInterface |
| 24 | { |
| 25 | private const string METADATA_MARKER = "\xab\xcd\xefMaxMind.com"; |
| 26 | |
| 27 | private ?string $fileContent = null; |
| 28 | private int $fileSize = 0; |
| 29 | private int $nodeCount = 0; |
| 30 | private int $recordSize = 0; |
| 31 | private int $nodeOffsetMult = 0; |
| 32 | private int $treeSize = 0; |
| 33 | private int $ipVersion = 4; |
| 34 | private bool $isLoaded = false; |
| 35 | |
| 36 | /** |
| 37 | * @param string $databasePath Absolute file path to .mmdb file. |
| 38 | */ |
| 39 | public function __construct(private readonly string $databasePath) |
| 40 | { |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Attempts to resolve IP to coordinates and metadata. |
| 45 | * |
| 46 | * @param string $ip IPv4 or IPv6 string. |
| 47 | * @return IpLocationDto|null Resolved DTO or null if not found. |
| 48 | */ |
| 49 | public function lookup(string $ip): ?IpLocationDto |
| 50 | { |
| 51 | $rawRecord = $this->resolveRawRecord($ip); |
| 52 | if ($rawRecord === null) { |
| 53 | return null; |
| 54 | } |
| 55 | |
| 56 | return $this->buildIpLocationDto($ip, $rawRecord); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * @return array<string, mixed>|null |
| 61 | */ |
| 62 | private function resolveRawRecord(string $ip): ?array |
| 63 | { |
| 64 | if (!$this->load()) { |
| 65 | return null; |
| 66 | } |
| 67 | |
| 68 | $packedIp = @inet_pton(trim($ip)); |
| 69 | if ($packedIp === false) { |
| 70 | return null; |
| 71 | } |
| 72 | |
| 73 | $rawRecord = $this->findRecord($packedIp); |
| 74 | return is_array($rawRecord) ? $rawRecord : null; |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * @param array<string, mixed> $rawRecord |
| 79 | */ |
| 80 | private function buildIpLocationDto(string $ip, array $rawRecord): ?IpLocationDto |
| 81 | { |
| 82 | $lat = isset($rawRecord['location']['latitude']) ? (float) $rawRecord['location']['latitude'] : null; |
| 83 | $lon = isset($rawRecord['location']['longitude']) ? (float) $rawRecord['location']['longitude'] : null; |
| 84 | if ($lat === null || $lon === null) { |
| 85 | return null; |
| 86 | } |
| 87 | |
| 88 | $countryCode = (string) ($rawRecord['country']['iso_code'] ?? ''); |
| 89 | $countryName = (string) ($rawRecord['country']['names']['en'] ?? $countryCode); |
| 90 | $cityName = (string) ($rawRecord['city']['names']['en'] ?? ''); |
| 91 | $timeZone = (string) ($rawRecord['location']['time_zone'] ?? ''); |
| 92 | |
| 93 | return new IpLocationDto( |
| 94 | ipAddress: trim($ip), |
| 95 | latitude: $lat, |
| 96 | longitude: $lon, |
| 97 | countryCode: $countryCode !== '' ? $countryCode : null, |
| 98 | countryName: $countryName !== '' ? $countryName : null, |
| 99 | cityName: $cityName !== '' ? $cityName : null, |
| 100 | timezone: $timeZone !== '' ? $timeZone : null |
| 101 | ); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Returns true if database file is loaded and operational. |
| 106 | */ |
| 107 | public function isAvailable(): bool |
| 108 | { |
| 109 | return $this->load(); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Lazy-loads and parses MMDB metadata section. |
| 114 | */ |
| 115 | private function load(): bool |
| 116 | { |
| 117 | if ($this->isLoaded) { |
| 118 | return true; |
| 119 | } |
| 120 | |
| 121 | if (!file_exists($this->databasePath) || !is_readable($this->databasePath)) { |
| 122 | return false; |
| 123 | } |
| 124 | |
| 125 | try { |
| 126 | $loaded = $this->parseDatabaseMetadata(); |
| 127 | } catch (Throwable) { |
| 128 | $loaded = false; |
| 129 | } |
| 130 | |
| 131 | return $loaded; |
| 132 | } |
| 133 | |
| 134 | private function parseDatabaseMetadata(): bool |
| 135 | { |
| 136 | $content = file_get_contents($this->databasePath); |
| 137 | if ($content === false || strlen($content) < 128) { |
| 138 | return false; |
| 139 | } |
| 140 | |
| 141 | $this->fileContent = $content; |
| 142 | $this->fileSize = strlen($content); |
| 143 | |
| 144 | $markerPos = strrpos($this->fileContent, self::METADATA_MARKER); |
| 145 | if ($markerPos === false) { |
| 146 | return false; |
| 147 | } |
| 148 | |
| 149 | $metaOffset = $markerPos + strlen(self::METADATA_MARKER); |
| 150 | return $this->initializeFromMetaOffset($metaOffset); |
| 151 | } |
| 152 | |
| 153 | private function initializeFromMetaOffset(int $metaOffset): bool |
| 154 | { |
| 155 | $metaData = $this->decodeData($metaOffset); |
| 156 | if (!is_array($metaData[0])) { |
| 157 | return false; |
| 158 | } |
| 159 | |
| 160 | $meta = $metaData[0]; |
| 161 | $this->nodeCount = (int) ($meta['node_count'] ?? 0); |
| 162 | $this->recordSize = (int) ($meta['record_size'] ?? 0); |
| 163 | $this->ipVersion = (int) ($meta['ip_version'] ?? 4); |
| 164 | |
| 165 | if ($this->nodeCount <= 0 || !in_array($this->recordSize, [24, 28, 32], true)) { |
| 166 | return false; |
| 167 | } |
| 168 | |
| 169 | $this->nodeOffsetMult = ($this->recordSize * 2) / 8; |
| 170 | $this->treeSize = (int) ($this->nodeCount * $this->nodeOffsetMult); |
| 171 | $this->isLoaded = true; |
| 172 | |
| 173 | return true; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Traverses the binary search tree for the given packed IP address. |
| 178 | */ |
| 179 | private function findRecord(string $packedIp): mixed |
| 180 | { |
| 181 | $ipLen = strlen($packedIp); |
| 182 | $bitCount = $ipLen * 8; |
| 183 | $node = 0; |
| 184 | |
| 185 | // If IPv4 in IPv6 database, traverse down 96 zeros to find IPv4 subtree |
| 186 | if ($this->ipVersion === 6 && $ipLen === 4) { |
| 187 | $packedIp = str_repeat("\x00", 12) . $packedIp; |
| 188 | $bitCount = 128; |
| 189 | } |
| 190 | |
| 191 | for ($i = 0; $i < $bitCount && $node < $this->nodeCount; ++$i) { |
| 192 | $byte = ord($packedIp[(int) ($i / 8)]); |
| 193 | $bit = ($byte >> (7 - ($i % 8))) & 1; |
| 194 | $node = $this->readNode($node, $bit); |
| 195 | } |
| 196 | |
| 197 | if ($node <= $this->nodeCount) { |
| 198 | return null; |
| 199 | } |
| 200 | |
| 201 | // Pointer into data section |
| 202 | $dataOffset = $node - $this->nodeCount - 16; |
| 203 | $fileOffset = $this->treeSize + 16 + $dataOffset; |
| 204 | if ($fileOffset >= $this->fileSize) { |
| 205 | return null; |
| 206 | } |
| 207 | |
| 208 | $decoded = $this->decodeData($fileOffset); |
| 209 | return $decoded[0] ?? null; |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Reads the child node value (left or right) from tree record. |
| 214 | */ |
| 215 | private function readNode(int $nodeIndex, int $index): int |
| 216 | { |
| 217 | $offset = $nodeIndex * $this->nodeOffsetMult; |
| 218 | |
| 219 | return match ($this->recordSize) { |
| 220 | 24 => $this->readNode24($offset, $index), |
| 221 | 32 => $this->readNode32($offset, $index), |
| 222 | default => $this->readNode28($offset, $index), |
| 223 | }; |
| 224 | } |
| 225 | |
| 226 | private function readNode24(int $offset, int $index): int |
| 227 | { |
| 228 | if ($index === 0) { |
| 229 | return (ord($this->fileContent[$offset]) << 16) |
| 230 | | (ord($this->fileContent[$offset + 1]) << 8) |
| 231 | | ord($this->fileContent[$offset + 2]); |
| 232 | } |
| 233 | return (ord($this->fileContent[$offset + 3]) << 16) |
| 234 | | (ord($this->fileContent[$offset + 4]) << 8) |
| 235 | | ord($this->fileContent[$offset + 5]); |
| 236 | } |
| 237 | |
| 238 | private function readNode32(int $offset, int $index): int |
| 239 | { |
| 240 | $pos = $offset + ($index * 4); |
| 241 | return (ord($this->fileContent[$pos]) << 24) |
| 242 | | (ord($this->fileContent[$pos + 1]) << 16) |
| 243 | | (ord($this->fileContent[$pos + 2]) << 8) |
| 244 | | ord($this->fileContent[$pos + 3]); |
| 245 | } |
| 246 | |
| 247 | private function readNode28(int $offset, int $index): int |
| 248 | { |
| 249 | $middle = ord($this->fileContent[$offset + 3]); |
| 250 | if ($index === 0) { |
| 251 | return (($middle & 0xF0) << 20) |
| 252 | | (ord($this->fileContent[$offset]) << 16) |
| 253 | | (ord($this->fileContent[$offset + 1]) << 8) |
| 254 | | ord($this->fileContent[$offset + 2]); |
| 255 | } |
| 256 | |
| 257 | return (($middle & 0x0F) << 24) |
| 258 | | (ord($this->fileContent[$offset + 4]) << 16) |
| 259 | | (ord($this->fileContent[$offset + 5]) << 8) |
| 260 | | ord($this->fileContent[$offset + 6]); |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Decodes data item from data section at specified offset. |
| 265 | * |
| 266 | * @return array{0: mixed, 1: int} Array of [decodedValue, nextOffset]. |
| 267 | */ |
| 268 | private function decodeData(int $offset): array |
| 269 | { |
| 270 | if ($offset >= $this->fileSize) { |
| 271 | return [null, $offset]; |
| 272 | } |
| 273 | |
| 274 | $ctrl = ord($this->fileContent[$offset]); |
| 275 | $type = $ctrl >> 5; |
| 276 | $size = $ctrl & 0x1F; |
| 277 | $current = $offset + 1; |
| 278 | |
| 279 | // Extended type 0 indicates next byte is actual type - 7 |
| 280 | if ($type === 0) { |
| 281 | $type = ord($this->fileContent[$current]) + 7; |
| 282 | $current++; |
| 283 | } |
| 284 | |
| 285 | if ($type === 1) { // Pointer |
| 286 | $pSize = ($ctrl >> 3) & 0x03; |
| 287 | return $this->decodePointer($ctrl, $pSize, $current); |
| 288 | } |
| 289 | |
| 290 | [$size, $current] = $this->resolveSize($size, $current); |
| 291 | |
| 292 | return $this->decodeValueByType($type, $size, $current); |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Resolves size field for standard MMDB types. |
| 297 | */ |
| 298 | private function resolveSize(int $size, int $current): array |
| 299 | { |
| 300 | if ($size === 29) { |
| 301 | $size = 29 + ord($this->fileContent[$current]); |
| 302 | $current++; |
| 303 | } elseif ($size === 30) { |
| 304 | $size = 285 + ((ord($this->fileContent[$current]) << 8) | ord($this->fileContent[$current + 1])); |
| 305 | $current += 2; |
| 306 | } elseif ($size === 31) { |
| 307 | $size = 65821 + ((ord($this->fileContent[$current]) << 16) |
| 308 | | (ord($this->fileContent[$current + 1]) << 8) |
| 309 | | ord($this->fileContent[$current + 2])); |
| 310 | $current += 3; |
| 311 | } |
| 312 | return [$size, $current]; |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Decodes a pointer reference to another location in the data section. |
| 317 | */ |
| 318 | private function decodePointer(int $ctrl, int $pSize, int $current): array |
| 319 | { |
| 320 | $b1 = ord($this->fileContent[$current]); |
| 321 | if ($pSize === 0) { |
| 322 | $ptr = (($ctrl & 0x07) << 8) | $b1; |
| 323 | $current += 1; |
| 324 | } elseif ($pSize === 1) { |
| 325 | $b2 = ord($this->fileContent[$current + 1]); |
| 326 | $ptr = 2048 + ((($ctrl & 0x07) << 16) | ($b1 << 8) | $b2); |
| 327 | $current += 2; |
| 328 | } elseif ($pSize === 2) { |
| 329 | $b2 = ord($this->fileContent[$current + 1]); |
| 330 | $b3 = ord($this->fileContent[$current + 2]); |
| 331 | $ptr = 526336 + ((($ctrl & 0x07) << 24) | ($b1 << 16) | ($b2 << 8) | $b3); |
| 332 | $current += 3; |
| 333 | } else { |
| 334 | $b2 = ord($this->fileContent[$current + 1]); |
| 335 | $b3 = ord($this->fileContent[$current + 2]); |
| 336 | $b4 = ord($this->fileContent[$current + 3]); |
| 337 | $ptr = ($b1 << 24) | ($b2 << 16) | ($b3 << 8) | $b4; |
| 338 | $current += 4; |
| 339 | } |
| 340 | |
| 341 | $targetOffset = $this->treeSize + 16 + $ptr; |
| 342 | $decoded = $this->decodeData($targetOffset); |
| 343 | |
| 344 | return [$decoded[0], $current]; |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * Decodes value by resolved MaxMind data type. |
| 349 | */ |
| 350 | private function decodeValueByType(int $type, int $size, int $current): array |
| 351 | { |
| 352 | return match ($type) { |
| 353 | 2 => [substr($this->fileContent, $current, $size), $current + $size], // UTF-8 String |
| 354 | 3 => $this->decodeDouble($current), // Double (IEEE 754) |
| 355 | 4 => [substr($this->fileContent, $current, $size), $current + $size], // Bytes |
| 356 | 5, 6, 9, 10 => $this->decodeUint($size, $current), // Unsigned integers |
| 357 | 7 => $this->decodeMap($size, $current), // Map |
| 358 | 8 => $this->decodeInt32($size, $current), // Signed 32-bit int |
| 359 | 11 => $this->decodeArray($size, $current), // Array |
| 360 | 14 => [$size === 1, $current], // Boolean |
| 361 | 15 => $this->decodeFloat($current), // Float |
| 362 | default => [null, $current + $size], |
| 363 | }; |
| 364 | } |
| 365 | |
| 366 | private function decodeDouble(int $current): array |
| 367 | { |
| 368 | $raw = substr($this->fileContent, $current, 8); |
| 369 | $val = unpack('E', $raw)[1] ?? 0.0; |
| 370 | return [(float) $val, $current + 8]; |
| 371 | } |
| 372 | |
| 373 | private function decodeFloat(int $current): array |
| 374 | { |
| 375 | $raw = substr($this->fileContent, $current, 4); |
| 376 | $val = unpack('G', $raw)[1] ?? 0.0; |
| 377 | return [(float) $val, $current + 4]; |
| 378 | } |
| 379 | |
| 380 | private function decodeUint(int $size, int $current): array |
| 381 | { |
| 382 | $val = 0; |
| 383 | for ($i = 0; $i < $size; ++$i) { |
| 384 | $val = ($val << 8) | ord($this->fileContent[$current + $i]); |
| 385 | } |
| 386 | return [$val, $current + $size]; |
| 387 | } |
| 388 | |
| 389 | private function decodeInt32(int $size, int $current): array |
| 390 | { |
| 391 | $val = 0; |
| 392 | for ($i = 0; $i < $size; ++$i) { |
| 393 | $val = ($val << 8) | ord($this->fileContent[$current + $i]); |
| 394 | } |
| 395 | if ($size === 4 && ($val & 0x80000000)) { |
| 396 | $val -= 0x100000000; |
| 397 | } |
| 398 | return [$val, $current + $size]; |
| 399 | } |
| 400 | |
| 401 | private function decodeMap(int $size, int $current): array |
| 402 | { |
| 403 | $map = []; |
| 404 | for ($i = 0; $i < $size; ++$i) { |
| 405 | [$key, $current] = $this->decodeData($current); |
| 406 | [$val, $current] = $this->decodeData($current); |
| 407 | if (is_string($key) || is_int($key)) { |
| 408 | $map[$key] = $val; |
| 409 | } |
| 410 | } |
| 411 | return [$map, $current]; |
| 412 | } |
| 413 | |
| 414 | private function decodeArray(int $size, int $current): array |
| 415 | { |
| 416 | $arr = []; |
| 417 | for ($i = 0; $i < $size; ++$i) { |
| 418 | [$val, $current] = $this->decodeData($current); |
| 419 | $arr[] = $val; |
| 420 | } |
| 421 | return [$arr, $current]; |
| 422 | } |
| 423 | } |