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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Console\Helper;
use Symfony\Component\Console\Output\OutputInterface;
/**
* The Dialog class provides helpers to interact with the user.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class DialogHelper extends Helper
{
private $inputStream;
private static $shell;
private static $stty;
/**
* Asks a question to the user.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param string $default The default answer if none is given by the user
*
* @return string The user answer
*
* @throws \RuntimeException If there is no data to read in the input stream
*/
public function ask(OutputInterface $output, $question, $default = null)
{
$output->write($question);
$ret = fgets($this->inputStream ?: STDIN, 4096);
if (false === $ret) {
throw new \RuntimeException('Aborted');
}
$ret = trim($ret);
return strlen($ret) > 0 ? $ret : $default;
}
/**
* Asks a confirmation to the user.
*
* The question will be asked until the user answers by nothing, yes, or no.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param Boolean $default The default answer if the user enters nothing
*
* @return Boolean true if the user has confirmed, false otherwise
*/
public function askConfirmation(OutputInterface $output, $question, $default = true)
{
$answer = 'z';
while ($answer && !in_array(strtolower($answer[0]), array('y', 'n'))) {
$answer = $this->ask($output, $question);
}
if (false === $default) {
return $answer && 'y' == strtolower($answer[0]);
}
return !$answer || 'y' == strtolower($answer[0]);
}
/**
* Asks a question to the user, the response is hidden
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question
* @param Boolean $fallback In case the response can not be hidden, whether to fallback on non-hidden question or not
*
* @return string The answer
*
* @throws \RuntimeException In case the fallback is deactivated and the response can not be hidden
*/
public function askHiddenResponse(OutputInterface $output, $question, $fallback = true)
{
if (defined('PHP_WINDOWS_VERSION_BUILD')) {
$exe = __DIR__ . '/../../Resources/bin/hiddeninput.exe';
// handle code running from a phar
if ('phar:' === substr(__FILE__, 0, 5)) {
$tmpExe = sys_get_temp_dir() . '/../../Resources/bin/hiddeninput.exe';
copy($exe, $tmpExe);
$exe = $tmpExe;
}
$output->write($question);
$value = rtrim(shell_exec($exe));
$output->writeln('');
if (isset($tmpExe)) {
unlink($tmpExe);
}
return $value;
}
if ($this->hasSttyAvailable()) {
$output->write($question);
$sttyMode = shell_exec('/usr/bin/env stty -g');
shell_exec('/usr/bin/env stty -echo');
$value = fgets($this->inputStream ?: STDIN, 4096);
shell_exec(sprintf('/usr/bin/env stty %s', $sttyMode));
if (false === $value) {
throw new \RuntimeException('Aborted');
}
$value = trim($value);
$output->writeln('');
return $value;
}
if (false !== $shell = $this->getShell()) {
$output->write($question);
$readCmd = $shell === 'csh' ? 'set mypassword = $<' : 'read mypassword';
$command = sprintf("/usr/bin/env %s -c 'stty -echo; %s; stty echo; echo \$mypassword'", $shell, $readCmd);
$value = rtrim(shell_exec($command));
$output->writeln('');
return $value;
}
if ($fallback) {
return $this->ask($output, $question);
}
throw new \RuntimeException('Unable to hide the response');
}
/**
* Asks for a value and validates the response.
*
* The validator receives the data to validate. It must return the
* validated data when the data is valid and throw an exception
* otherwise.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param callable $validator A PHP callback
* @param integer $attempts Max number of times to ask before giving up (false by default, which means infinite)
* @param string $default The default answer if none is given by the user
*
* @return mixed
*
* @throws \Exception When any of the validators return an error
*/
public function askAndValidate(OutputInterface $output, $question, $validator, $attempts = false, $default = null)
{
$that = $this;
$interviewer = function() use ($output, $question, $default, $that) {
return $that->ask($output, $question, $default);
};
return $this->validateAttempts($interviewer, $output, $validator, $attempts);
}
/**
* Asks for a value, hide and validates the response.
*
* The validator receives the data to validate. It must return the
* validated data when the data is valid and throw an exception
* otherwise.
*
* @param OutputInterface $output An Output instance
* @param string|array $question The question to ask
* @param callable $validator A PHP callback
* @param integer $attempts Max number of times to ask before giving up (false by default, which means infinite)
* @param Boolean $fallback In case the response can not be hidden, whether to fallback on non-hidden question or not
*
* @return string The response
*
* @throws \Exception When any of the validators return an error
* @throws \RuntimeException In case the fallback is deactivated and the response can not be hidden
*
*/
public function askHiddenResponseAndValidate(OutputInterface $output, $question, $validator, $attempts = false, $fallback = true)
{
$that = $this;
$interviewer = function() use ($output, $question, $fallback, $that) {
return $that->askHiddenResponse($output, $question, $fallback);
};
return $this->validateAttempts($interviewer, $output, $validator, $attempts);
}
/**
* Sets the input stream to read from when interacting with the user.
*
* This is mainly useful for testing purpose.
*
* @param resource $stream The input stream
*/
public function setInputStream($stream)
{
$this->inputStream = $stream;
}
/**
* Returns the helper's input stream
*
* @return string
*/
public function getInputStream()
{
return $this->inputStream;
}
/**
* {@inheritDoc}
*/
public function getName()
{
return 'dialog';
}
/**
* Return a valid unix shell
*
* @return string|false The valid shell name, false in case no valid shell is found
*/
private function getShell()
{
if (null !== self::$shell) {
return self::$shell;
}
self::$shell = false;
if (file_exists('/usr/bin/env')) {
// handle other OSs with bash/zsh/ksh/csh if available to hide the answer
$test = "/usr/bin/env %s -c 'echo OK' 2> /dev/null";
foreach (array('bash', 'zsh', 'ksh', 'csh') as $sh) {
if ('OK' === rtrim(shell_exec(sprintf($test, $sh)))) {
self::$shell = $sh;
break;
}
}
}
return self::$shell;
}
private function hasSttyAvailable()
{
if (null !== self::$stty) {
return self::$stty;
}
exec('/usr/bin/env stty', $output, $exicode);
return self::$stty = $exicode === 0;
}
/**
* Validate an attempt
*
* @param callable $interviewer A callable that will ask for a question and return the result
* @param OutputInterface $output An Output instance
* @param callable $validator A PHP callback
* @param integer $attempts Max number of times to ask before giving up ; false will ask infinitely
*
* @return string The validated response
*
* @throws \Exception In case the max number of attempts has been reached and no valid response has been given
*/
private function validateAttempts($interviewer, OutputInterface $output, $validator, $attempts)
{
$error = null;
while (false === $attempts || $attempts--) {
if (null !== $error) {
$output->writeln($this->getHelperSet()->get('formatter')->formatBlock($error->getMessage(), 'error'));
}
try {
return call_user_func($validator, $interviewer());
} catch (\Exception $error) {
}
}
throw $error;
}
}
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