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<?php |
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declare(strict_types=1); |
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namespace BitWasp\PinEntry\Process; |
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class IPC |
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{ |
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const STDIN = 0; |
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const STDOUT = 1; |
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const STDERR = 2; |
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/** |
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* Contains a default file descriptor definitions |
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* for the STDIN, STDOUT, STDERR streams. |
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* @var array |
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*/ |
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protected static $defaultDescriptor = [ |
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// Define the STDIN pipe the child will read from |
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self::STDIN => ["pipe", "r"], |
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// Define the STDOUT pipe the child will write to |
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self::STDOUT => ["pipe", "w"], |
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// Define the STDERR pipe the child will write to. Can also |
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// specify a file instead of writing to this process. |
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self::STDERR => ["pipe", "w"], |
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]; |
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/** |
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* @var resource[] |
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*/ |
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private $fhList = []; |
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public function __construct(array $fileHandles) |
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{ |
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$missingKeys = array_diff_key(self::$defaultDescriptor, $fileHandles); |
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if (count($missingKeys) > 0) { |
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throw new \InvalidArgumentException("Missing required file handle ({$missingKeys[0]})"); |
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} |
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foreach ($fileHandles as $fhKey => $fh) { |
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if (!(is_resource($fh) && get_resource_type($fh) === "stream")) { |
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throw new \InvalidArgumentException("Invalid file handle ({$fhKey})"); |
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} |
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} |
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stream_set_blocking($fileHandles[self::STDOUT], false); |
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stream_set_blocking($fileHandles[self::STDERR], false); |
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$this->fhList = $fileHandles; |
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} |
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public function close() |
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{ |
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fclose($this->fhList[self::STDIN]); |
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fclose($this->fhList[self::STDOUT]); |
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fclose($this->fhList[self::STDERR]); |
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} |
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/** |
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* @param string $data |
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* @return int |
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*/ |
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public function send(string $data): int |
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{ |
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$write = fwrite($this->fhList[self::STDIN], $data); |
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if ($write === false) { |
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throw new \RuntimeException("Failed to write to process stdin"); |
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} |
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return $write; |
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} |
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public function readStdOut(): string |
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{ |
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return $this->blockingRead($this->fhList[self::STDOUT]); |
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} |
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/** |
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* @param resource $fh |
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* @return string |
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*/ |
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private function blockingRead($fh) |
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{ |
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$rx = [$fh]; |
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$wx = []; |
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$ex = []; |
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// This will pause execution until the stream changes state, |
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// most likely indicating it is ready to be read. |
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if (false === stream_select($rx, $wx, $ex, null, 0)) { |
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throw new \RuntimeException("stream_select failed"); |
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} |
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// maybe we should inspect $rx to see what the new status is before reading |
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$buffer = stream_get_contents($fh); |
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if ($buffer === false) { |
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throw new \RuntimeException("Reading from stream failed"); |
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} |
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assert($buffer !== ""); |
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return $buffer; |
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} |
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/** |
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* Return the default descriptors values, overloaded with |
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* the value in $overrideDescriptors if the same key is set there. |
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* |
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* @param array[] $overrideDescriptors |
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* @return array[] |
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*/ |
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public static function buildDescriptors(array $overrideDescriptors = []): array |
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{ |
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$descriptor = static::$defaultDescriptor; |
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foreach (array_intersect_key($descriptor, $overrideDescriptors) as $key => $value) { |
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$descriptor[$key] = $overrideDescriptors[$key]; |
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} |
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return $descriptor; |
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} |
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} |
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Bit-Wasp /
pinentry
