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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** |
| 6 | * This file is part of php-fast-forward/config. |
| 7 | * |
| 8 | * This source file is subject to the license bundled |
| 9 | * with this source code in the file LICENSE. |
| 10 | * |
| 11 | * @copyright Copyright (c) 2025-2026 Felipe Sayão Lobato Abreu <github@mentordosnerds.com> |
| 12 | * @license https://opensource.org/licenses/MIT MIT License |
| 13 | * |
| 14 | * @see https://github.com/php-fast-forward/config |
| 15 | * @see https://github.com/php-fast-forward |
| 16 | * @see https://datatracker.ietf.org/doc/html/rfc2119 |
| 17 | */ |
| 18 | |
| 19 | namespace FastForward\Config; |
| 20 | |
| 21 | use Brick\VarExporter\VarExporter; |
| 22 | use FastForward\Config\Exception\InvalidArgumentException; |
| 23 | |
| 24 | /** |
| 25 | * Class PhpFileConfig. |
| 26 | * |
| 27 | * Provides a configuration source backed by a single PHP file returning an array. |
| 28 | * This class MUST load the configuration from the specified PHP file. |
| 29 | * It SHALL lazily initialize and retrieve configuration data upon invocation. |
| 30 | * If configured as persistent, mutations made via `set` and `remove` SHALL be persisted back to the file. |
| 31 | */ |
| 32 | class PhpFileConfig implements ConfigInterface |
| 33 | { |
| 34 | use LazyLoadConfigTrait; |
| 35 | |
| 36 | /** |
| 37 | * Constructs a PhpFileConfig instance. |
| 38 | * |
| 39 | * @param string $file the path to the PHP configuration file |
| 40 | * @param bool $persistent whether changes should be saved back to the file |
| 41 | * @param array<string, mixed>|ConfigInterface|null $defaultConfig optional default configuration when the file does not exist |
| 42 | */ |
| 43 | public function __construct( |
| 44 | private string $file, |
| 45 | private bool $persistent = false, |
| 46 | private array|ConfigInterface|null $defaultConfig = null, |
| 47 | ) { |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Invokes the configuration and returns the configuration data. |
| 52 | * |
| 53 | * If the file exists, it MUST return a valid array. |
| 54 | * If the file does not exist but a default configuration is provided, |
| 55 | * the default configuration SHALL be used. |
| 56 | * |
| 57 | * @return ConfigInterface a ConfigInterface implementation containing the configuration data |
| 58 | * |
| 59 | * @throws InvalidArgumentException if the file is unreadable or does not return an array |
| 60 | */ |
| 61 | public function __invoke(): ConfigInterface |
| 62 | { |
| 63 | return $this->loadConfig(); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Sets configuration data. |
| 68 | * |
| 69 | * This method MUST update the configuration data in the file if the persistent flag is set to true. |
| 70 | * |
| 71 | * @param array<string, mixed>|ConfigInterface|string $key the configuration key or an array of key-value pairs to set |
| 72 | * @param mixed $value the value to set for the specified key |
| 73 | * |
| 74 | * @return void |
| 75 | * |
| 76 | * @throws InvalidArgumentException if the key is invalid or file cannot be written |
| 77 | */ |
| 78 | public function set(array|ConfigInterface|string $key, mixed $value = null): void |
| 79 | { |
| 80 | if (! $this->persistent) { |
| 81 | $this->getConfig()->set($key, $value); |
| 82 | |
| 83 | return; |
| 84 | } |
| 85 | |
| 86 | $this->mutate(static function (ConfigInterface $config) use ($key, $value): void { |
| 87 | $config->set($key, $value); |
| 88 | }); |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Removes a configuration key and its associated value. |
| 93 | * |
| 94 | * This method MUST update the configuration data in the file if the persistent flag is set to true. |
| 95 | * |
| 96 | * @param string $key the configuration key to remove |
| 97 | * |
| 98 | * @return void |
| 99 | * |
| 100 | * @throws InvalidArgumentException if the file cannot be written |
| 101 | */ |
| 102 | public function remove(string $key): void |
| 103 | { |
| 104 | if (! $this->persistent) { |
| 105 | $this->getConfig()->remove($key); |
| 106 | |
| 107 | return; |
| 108 | } |
| 109 | |
| 110 | $this->mutate(static function (ConfigInterface $config) use ($key): void { |
| 111 | $config->remove($key); |
| 112 | }); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Loads the configuration from the file or default configuration. |
| 117 | * |
| 118 | * @return ConfigInterface |
| 119 | * |
| 120 | * @throws InvalidArgumentException if the file is unreadable or does not return an array |
| 121 | */ |
| 122 | private function loadConfig(): ConfigInterface |
| 123 | { |
| 124 | if (! file_exists($this->file)) { |
| 125 | if ($this->defaultConfig !== null) { |
| 126 | $data = $this->defaultConfig instanceof ConfigInterface |
| 127 | ? $this->defaultConfig->toArray() |
| 128 | : $this->defaultConfig; |
| 129 | |
| 130 | return new ArrayConfig($data); |
| 131 | } |
| 132 | |
| 133 | throw InvalidArgumentException::forUnreadableFile($this->file); |
| 134 | } |
| 135 | |
| 136 | if (! is_file($this->file) || ! is_readable($this->file)) { |
| 137 | throw InvalidArgumentException::forUnreadableFile($this->file); |
| 138 | } |
| 139 | |
| 140 | $data = (static function (string $file): mixed { |
| 141 | return require $file; |
| 142 | })($this->file); |
| 143 | |
| 144 | if (! \is_array($data)) { |
| 145 | throw InvalidArgumentException::forInvalidConfigFile($this->file); |
| 146 | } |
| 147 | |
| 148 | return new ArrayConfig($data); |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * Executes a persistent mutation under an exclusive process lock. |
| 153 | * |
| 154 | * @param callable(ConfigInterface): void $operation |
| 155 | * |
| 156 | * @return void |
| 157 | * |
| 158 | * @throws InvalidArgumentException if the lock or file cannot be written |
| 159 | */ |
| 160 | private function mutate(callable $operation): void |
| 161 | { |
| 162 | $targetFile = $this->resolveTargetFile(); |
| 163 | $dir = \dirname($targetFile); |
| 164 | |
| 165 | if (! is_dir($dir)) { |
| 166 | if (! @mkdir($dir, 0777, true) && ! is_dir($dir)) { |
| 167 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 168 | } |
| 169 | } elseif (! is_writable($dir)) { |
| 170 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 171 | } |
| 172 | |
| 173 | if (file_exists($targetFile) && (! is_file($targetFile) || ! is_writable($targetFile))) { |
| 174 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 175 | } |
| 176 | |
| 177 | $lockPath = $dir . '/.' . \basename($targetFile) . '.lock'; |
| 178 | $lockFp = @fopen($lockPath, 'c+'); |
| 179 | |
| 180 | if (false === $lockFp) { |
| 181 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 182 | } |
| 183 | |
| 184 | try { |
| 185 | if (! @flock($lockFp, \LOCK_EX)) { |
| 186 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 187 | } |
| 188 | |
| 189 | try { |
| 190 | $config = $this->loadConfig(); |
| 191 | $operation($config); |
| 192 | $this->dump($config->toArray(), $targetFile); |
| 193 | $this->config = $config; |
| 194 | } finally { |
| 195 | @flock($lockFp, \LOCK_UN); |
| 196 | } |
| 197 | } finally { |
| 198 | @fclose($lockFp); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * Dumps the configuration array to the PHP file. |
| 204 | * |
| 205 | * @param array<array-key, mixed> $data the configuration data to write |
| 206 | * @param string|null $targetFile optional target file override (e.g. resolved symlink target) |
| 207 | * |
| 208 | * @return void |
| 209 | * |
| 210 | * @throws InvalidArgumentException if the file or directory is not writable, or cannot be exported |
| 211 | */ |
| 212 | private function dump(array $data, ?string $targetFile = null): void |
| 213 | { |
| 214 | $targetFile ??= $this->resolveTargetFile(); |
| 215 | $dir = \dirname($targetFile); |
| 216 | |
| 217 | if (! is_dir($dir)) { |
| 218 | if (! @mkdir($dir, 0777, true) && ! is_dir($dir)) { |
| 219 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 220 | } |
| 221 | } elseif (! is_writable($dir)) { |
| 222 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 223 | } |
| 224 | |
| 225 | if (file_exists($targetFile) && (! is_file($targetFile) || ! is_writable($targetFile))) { |
| 226 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 227 | } |
| 228 | |
| 229 | try { |
| 230 | $exported = VarExporter::export($data); |
| 231 | } catch (\Throwable $e) { |
| 232 | throw new InvalidArgumentException($e->getMessage(), (int) $e->getCode(), $e); |
| 233 | } |
| 234 | |
| 235 | $content = "<?php\n\ndeclare(strict_types=1);\n\nreturn {$exported};\n"; |
| 236 | |
| 237 | $tmpFile = tempnam($dir, 'cfg_'); |
| 238 | if (false === $tmpFile) { |
| 239 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 240 | } |
| 241 | |
| 242 | $bytesWritten = @file_put_contents($tmpFile, $content, \LOCK_EX); |
| 243 | if ($bytesWritten !== \strlen($content)) { |
| 244 | @unlink($tmpFile); |
| 245 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 246 | } |
| 247 | |
| 248 | $existingPerms = file_exists($targetFile) ? @fileperms($targetFile) : false; |
| 249 | $mode = false !== $existingPerms ? ($existingPerms & 0777) : (0666 & ~umask()); |
| 250 | @chmod($tmpFile, $mode); |
| 251 | |
| 252 | if (! @rename($tmpFile, $targetFile)) { |
| 253 | @unlink($tmpFile); |
| 254 | throw InvalidArgumentException::forUnwritableFile($this->file); |
| 255 | } |
| 256 | |
| 257 | if (\function_exists('opcache_invalidate')) { |
| 258 | @opcache_invalidate($targetFile, true); |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | /** |
| 263 | * Resolves the target file path, resolving symlinks to their canonical target. |
| 264 | * |
| 265 | * @return string |
| 266 | */ |
| 267 | private function resolveTargetFile(): string |
| 268 | { |
| 269 | if (! is_link($this->file)) { |
| 270 | return $this->file; |
| 271 | } |
| 272 | |
| 273 | $resolved = realpath($this->file); |
| 274 | if (false !== $resolved) { |
| 275 | return $resolved; |
| 276 | } |
| 277 | |
| 278 | $target = readlink($this->file); |
| 279 | if (false === $target) { |
| 280 | return $this->file; |
| 281 | } |
| 282 | |
| 283 | if (! str_starts_with($target, '/')) { |
| 284 | return \dirname($this->file) . '/' . $target; |
| 285 | } |
| 286 | |
| 287 | return $target; |
| 288 | } |
| 289 | } |