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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\Dotenv;
use Symfony\Component\Dotenv\Exception\FormatException;
use Symfony\Component\Dotenv\Exception\FormatExceptionContext;
use Symfony\Component\Dotenv\Exception\PathException;
use Symfony\Component\Process\Exception\ExceptionInterface as ProcessException;
use Symfony\Component\Process\Process;
/**
* Manages .env files.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Kévin Dunglas <dunglas@gmail.com>
*/
final class Dotenv
{
public const VARNAME_REGEX = '(?i:[A-Z][A-Z0-9_]*+)';
public const STATE_VARNAME = 0;
public const STATE_VALUE = 1;
private $path;
private $cursor;
private $lineno;
private $data;
private $end;
private $values;
private $usePutenv;
/**
* @var bool If `putenv()` should be used to define environment variables or not.
* Beware that `putenv()` is not thread safe and this setting will default
* to `false` in Symfony 5.0.
*/
public function __construct(bool $usePutenv = true)
{
if (!\func_num_args()) {
@trigger_error(sprintf('The default value of "$usePutenv" argument of "%s" will be changed from "true" to "false" in Symfony 5.0. You should define its value explicitly.', __METHOD__), \E_USER_DEPRECATED);
}
$this->usePutenv = $usePutenv;
}
/**
* Loads one or several .env files.
*
* @param string $path A file to load
* @param string[] ...$extraPaths A list of additional files to load
*
* @throws FormatException when a file has a syntax error
* @throws PathException when a file does not exist or is not readable
*/
public function load(string $path, string ...$extraPaths): void
{
$this->doLoad(false, \func_get_args());
}
/**
* Loads a .env file and the corresponding .env.local, .env.$env and .env.$env.local files if they exist.
*
* .env.local is always ignored in test env because tests should produce the same results for everyone.
* .env.dist is loaded when it exists and .env is not found.
*
* @param string $path A file to load
* @param string $varName The name of the env vars that defines the app env
* @param string $defaultEnv The app env to use when none is defined
* @param array $testEnvs A list of app envs for which .env.local should be ignored
*
* @throws FormatException when a file has a syntax error
* @throws PathException when a file does not exist or is not readable
*/
public function loadEnv(string $path, string $varName = 'APP_ENV', string $defaultEnv = 'dev', array $testEnvs = ['test']): void
{
if (file_exists($path) || !file_exists($p = "$path.dist")) {
$this->load($path);
} else {
$this->load($p);
}
if (null === $env = $_SERVER[$varName] ?? $_ENV[$varName] ?? null) {
$this->populate([$varName => $env = $defaultEnv]);
}
if (!\in_array($env, $testEnvs, true) && file_exists($p = "$path.local")) {
$this->load($p);
$env = $_SERVER[$varName] ?? $_ENV[$varName] ?? $env;
}
if ('local' === $env) {
return;
}
if (file_exists($p = "$path.$env")) {
$this->load($p);
}
if (file_exists($p = "$path.$env.local")) {
$this->load($p);
}
}
/**
* Loads one or several .env files and enables override existing vars.
*
* @param string $path A file to load
* @param string[] ...$extraPaths A list of additional files to load
*
* @throws FormatException when a file has a syntax error
* @throws PathException when a file does not exist or is not readable
*/
public function overload(string $path, string ...$extraPaths): void
{
$this->doLoad(true, \func_get_args());
}
/**
* Sets values as environment variables (via putenv, $_ENV, and $_SERVER).
*
* @param array $values An array of env variables
* @param bool $overrideExistingVars true when existing environment variables must be overridden
*/
public function populate(array $values, bool $overrideExistingVars = false): void
{
$updateLoadedVars = false;
$loadedVars = array_flip(explode(',', $_SERVER['SYMFONY_DOTENV_VARS'] ?? $_ENV['SYMFONY_DOTENV_VARS'] ?? ''));
foreach ($values as $name => $value) {
$notHttpName = 0 !== strpos($name, 'HTTP_');
if (isset($_SERVER[$name]) && $notHttpName && !isset($_ENV[$name])) {
$_ENV[$name] = $_SERVER[$name];
}
// don't check existence with getenv() because of thread safety issues
if (!isset($loadedVars[$name]) && !$overrideExistingVars && isset($_ENV[$name])) {
continue;
}
if ($this->usePutenv) {
putenv("$name=$value");
}
$_ENV[$name] = $value;
if ($notHttpName) {
$_SERVER[$name] = $value;
}
if (!isset($loadedVars[$name])) {
$loadedVars[$name] = $updateLoadedVars = true;
}
}
if ($updateLoadedVars) {
unset($loadedVars['']);
$loadedVars = implode(',', array_keys($loadedVars));
$_ENV['SYMFONY_DOTENV_VARS'] = $_SERVER['SYMFONY_DOTENV_VARS'] = $loadedVars;
if ($this->usePutenv) {
putenv('SYMFONY_DOTENV_VARS='.$loadedVars);
}
}
}
/**
* Parses the contents of an .env file.
*
* @param string $data The data to be parsed
* @param string $path The original file name where data where stored (used for more meaningful error messages)
*
* @return array An array of env variables
*
* @throws FormatException when a file has a syntax error
*/
public function parse(string $data, string $path = '.env'): array
{
$this->path = $path;
$this->data = str_replace(["\r\n", "\r"], "\n", $data);
$this->lineno = 1;
$this->cursor = 0;
$this->end = \strlen($this->data);
$state = self::STATE_VARNAME;
$this->values = [];
$name = '';
$this->skipEmptyLines();
while ($this->cursor < $this->end) {
switch ($state) {
case self::STATE_VARNAME:
$name = $this->lexVarname();
$state = self::STATE_VALUE;
break;
case self::STATE_VALUE:
$this->values[$name] = $this->lexValue();
$state = self::STATE_VARNAME;
break;
}
}
if (self::STATE_VALUE === $state) {
$this->values[$name] = '';
}
try {
return $this->values;
} finally {
$this->values = [];
$this->data = null;
$this->path = null;
}
}
private function lexVarname(): string
{
// var name + optional export
if (!preg_match('/(export[ \t]++)?('.self::VARNAME_REGEX.')/A', $this->data, $matches, 0, $this->cursor)) {
throw $this->createFormatException('Invalid character in variable name');
}
$this->moveCursor($matches[0]);
if ($this->cursor === $this->end || "\n" === $this->data[$this->cursor] || '#' === $this->data[$this->cursor]) {
if ($matches[1]) {
throw $this->createFormatException('Unable to unset an environment variable');
}
throw $this->createFormatException('Missing = in the environment variable declaration');
}
if (' ' === $this->data[$this->cursor] || "\t" === $this->data[$this->cursor]) {
throw $this->createFormatException('Whitespace characters are not supported after the variable name');
}
if ('=' !== $this->data[$this->cursor]) {
throw $this->createFormatException('Missing = in the environment variable declaration');
}
++$this->cursor;
return $matches[2];
}
private function lexValue(): string
{
if (preg_match('/[ \t]*+(?:#.*)?$/Am', $this->data, $matches, 0, $this->cursor)) {
$this->moveCursor($matches[0]);
$this->skipEmptyLines();
return '';
}
if (' ' === $this->data[$this->cursor] || "\t" === $this->data[$this->cursor]) {
throw $this->createFormatException('Whitespace are not supported before the value');
}
$loadedVars = array_flip(explode(',', $_SERVER['SYMFONY_DOTENV_VARS'] ?? ($_ENV['SYMFONY_DOTENV_VARS'] ?? '')));
unset($loadedVars['']);
$v = '';
do {
if ("'" === $this->data[$this->cursor]) {
$len = 0;
do {
if ($this->cursor + ++$len === $this->end) {
$this->cursor += $len;
throw $this->createFormatException('Missing quote to end the value');
}
} while ("'" !== $this->data[$this->cursor + $len]);
$v .= substr($this->data, 1 + $this->cursor, $len - 1);
$this->cursor += 1 + $len;
} elseif ('"' === $this->data[$this->cursor]) {
$value = '';
if (++$this->cursor === $this->end) {
throw $this->createFormatException('Missing quote to end the value');
}
while ('"' !== $this->data[$this->cursor] || ('\\' === $this->data[$this->cursor - 1] && '\\' !== $this->data[$this->cursor - 2])) {
$value .= $this->data[$this->cursor];
++$this->cursor;
if ($this->cursor === $this->end) {
throw $this->createFormatException('Missing quote to end the value');
}
}
++$this->cursor;
$value = str_replace(['\\"', '\r', '\n'], ['"', "\r", "\n"], $value);
$resolvedValue = $value;
$resolvedValue = $this->resolveVariables($resolvedValue, $loadedVars);
$resolvedValue = $this->resolveCommands($resolvedValue, $loadedVars);
$resolvedValue = str_replace('\\\\', '\\', $resolvedValue);
$v .= $resolvedValue;
} else {
$value = '';
$prevChr = $this->data[$this->cursor - 1];
while ($this->cursor < $this->end && !\in_array($this->data[$this->cursor], ["\n", '"', "'"], true) && !((' ' === $prevChr || "\t" === $prevChr) && '#' === $this->data[$this->cursor])) {
if ('\\' === $this->data[$this->cursor] && isset($this->data[$this->cursor + 1]) && ('"' === $this->data[$this->cursor + 1] || "'" === $this->data[$this->cursor + 1])) {
++$this->cursor;
}
$value .= $prevChr = $this->data[$this->cursor];
if ('$' === $this->data[$this->cursor] && isset($this->data[$this->cursor + 1]) && '(' === $this->data[$this->cursor + 1]) {
++$this->cursor;
$value .= '('.$this->lexNestedExpression().')';
}
++$this->cursor;
}
$value = rtrim($value);
$resolvedValue = $value;
$resolvedValue = $this->resolveVariables($resolvedValue, $loadedVars);
$resolvedValue = $this->resolveCommands($resolvedValue, $loadedVars);
$resolvedValue = str_replace('\\\\', '\\', $resolvedValue);
if ($resolvedValue === $value && preg_match('/\s+/', $value)) {
throw $this->createFormatException('A value containing spaces must be surrounded by quotes');
}
$v .= $resolvedValue;
if ($this->cursor < $this->end && '#' === $this->data[$this->cursor]) {
break;
}
}
} while ($this->cursor < $this->end && "\n" !== $this->data[$this->cursor]);
$this->skipEmptyLines();
return $v;
}
private function lexNestedExpression(): string
{
++$this->cursor;
$value = '';
while ("\n" !== $this->data[$this->cursor] && ')' !== $this->data[$this->cursor]) {
$value .= $this->data[$this->cursor];
if ('(' === $this->data[$this->cursor]) {
$value .= $this->lexNestedExpression().')';
}
++$this->cursor;
if ($this->cursor === $this->end) {
throw $this->createFormatException('Missing closing parenthesis.');
}
}
if ("\n" === $this->data[$this->cursor]) {
throw $this->createFormatException('Missing closing parenthesis.');
}
return $value;
}
private function skipEmptyLines()
{
if (preg_match('/(?:\s*+(?:#[^\n]*+)?+)++/A', $this->data, $match, 0, $this->cursor)) {
$this->moveCursor($match[0]);
}
}
private function resolveCommands(string $value, array $loadedVars): string
{
if (false === strpos($value, '$')) {
return $value;
}
$regex = '/
(\\\\)? # escaped with a backslash?
\$
(?<cmd>
\( # require opening parenthesis
([^()]|\g<cmd>)+ # allow any number of non-parens, or balanced parens (by nesting the <cmd> expression recursively)
\) # require closing paren
)
/x';
return preg_replace_callback($regex, function ($matches) use ($loadedVars) {
if ('\\' === $matches[1]) {
return substr($matches[0], 1);
}
if ('\\' === \DIRECTORY_SEPARATOR) {
throw new \LogicException('Resolving commands is not supported on Windows.');
}
if (!class_exists(Process::class)) {
throw new \LogicException('Resolving commands requires the Symfony Process component.');
}
$process = method_exists(Process::class, 'fromShellCommandline') ? Process::fromShellCommandline('echo '.$matches[0]) : new Process('echo '.$matches[0]);
if (!method_exists(Process::class, 'fromShellCommandline') && method_exists(Process::class, 'inheritEnvironmentVariables')) {
// Symfony 3.4 does not inherit env vars by default:
$process->inheritEnvironmentVariables();
}
$env = [];
foreach ($this->values as $name => $value) {
if (isset($loadedVars[$name]) || (!isset($_ENV[$name]) && !(isset($_SERVER[$name]) && 0 !== strpos($name, 'HTTP_')))) {
$env[$name] = $value;
}
}
$process->setEnv($env);
try {
$process->mustRun();
} catch (ProcessException $e) {
throw $this->createFormatException(sprintf('Issue expanding a command (%s)', $process->getErrorOutput()));
}
return preg_replace('/[\r\n]+$/', '', $process->getOutput());
}, $value);
}
private function resolveVariables(string $value, array $loadedVars): string
{
if (false === strpos($value, '$')) {
return $value;
}
$regex = '/
(?<!\\\\)
(?P<backslashes>\\\\*) # escaped with a backslash?
\$
(?!\() # no opening parenthesis
(?P<opening_brace>\{)? # optional brace
(?P<name>'.self::VARNAME_REGEX.')? # var name
(?P<default_value>:[-=][^\}]++)? # optional default value
(?P<closing_brace>\})? # optional closing brace
/x';
$value = preg_replace_callback($regex, function ($matches) use ($loadedVars) {
// odd number of backslashes means the $ character is escaped
if (1 === \strlen($matches['backslashes']) % 2) {
return substr($matches[0], 1);
}
// unescaped $ not followed by variable name
if (!isset($matches['name'])) {
return $matches[0];
}
if ('{' === $matches['opening_brace'] && !isset($matches['closing_brace'])) {
throw $this->createFormatException('Unclosed braces on variable expansion');
}
$name = $matches['name'];
if (isset($loadedVars[$name]) && isset($this->values[$name])) {
$value = $this->values[$name];
} elseif (isset($_ENV[$name])) {
$value = $_ENV[$name];
} elseif (isset($_SERVER[$name]) && 0 !== strpos($name, 'HTTP_')) {
$value = $_SERVER[$name];
} elseif (isset($this->values[$name])) {
$value = $this->values[$name];
} else {
$value = (string) getenv($name);
}
if ('' === $value && isset($matches['default_value']) && '' !== $matches['default_value']) {
$unsupportedChars = strpbrk($matches['default_value'], '\'"{$');
if (false !== $unsupportedChars) {
throw $this->createFormatException(sprintf('Unsupported character "%s" found in the default value of variable "$%s".', $unsupportedChars[0], $name));
}
$value = substr($matches['default_value'], 2);
if ('=' === $matches['default_value'][1]) {
$this->values[$name] = $value;
}
}
if (!$matches['opening_brace'] && isset($matches['closing_brace'])) {
$value .= '}';
}
return $matches['backslashes'].$value;
}, $value);
return $value;
}
private function moveCursor(string $text)
{
$this->cursor += \strlen($text);
$this->lineno += substr_count($text, "\n");
}
private function createFormatException(string $message): FormatException
{
return new FormatException($message, new FormatExceptionContext($this->data, $this->path, $this->lineno, $this->cursor));
}
private function doLoad(bool $overrideExistingVars, array $paths): void
{
foreach ($paths as $path) {
if (!is_readable($path) || is_dir($path)) {
throw new PathException($path);
}
$this->populate($this->parse(file_get_contents($path), $path), $overrideExistingVars);
}
}
}