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<?php
namespace Dotenv;
use Dotenv\Exception\InvalidFileException;
use Dotenv\Exception\InvalidPathException;
/**
* This is the loaded class.
*
* It's responsible for loading variables by reading a file from disk and:
* - stripping comments beginning with a `#`,
* - parsing lines that look shell variable setters, e.g `export key = value`, `key="value"`.
*/
class Loader
{
/**
* The file path.
*
* @var string
*/
protected $filePath;
/**
* Are we immutable?
*
* @var bool
*/
protected $immutable;
/**
* Create a new loader instance.
*
* @param string $filePath
* @param bool $immutable
*
* @return void
*/
public function __construct($filePath, $immutable = false)
{
$this->filePath = $filePath;
$this->immutable = $immutable;
}
/**
* Load `.env` file in given directory.
*
* @return array
*/
public function load()
{
$this->ensureFileIsReadable();
$filePath = $this->filePath;
$lines = $this->readLinesFromFile($filePath);
foreach ($lines as $line) {
if (!$this->isComment($line) && $this->looksLikeSetter($line)) {
$this->setEnvironmentVariable($line);
}
}
return $lines;
}
/**
* Ensures the given filePath is readable.
*
* @throws \Dotenv\Exception\InvalidPathException
*
* @return void
*/
protected function ensureFileIsReadable()
{
if (!is_readable($this->filePath) || !is_file($this->filePath)) {
throw new InvalidPathException(sprintf('Unable to read the environment file at %s.', $this->filePath));
}
}
/**
* Normalise the given environment variable.
*
* Takes value as passed in by developer and:
* - ensures we're dealing with a separate name and value, breaking apart the name string if needed,
* - cleaning the value of quotes,
* - cleaning the name of quotes,
* - resolving nested variables.
*
* @param string $name
* @param string $value
*
* @return array
*/
protected function normaliseEnvironmentVariable($name, $value)
{
list($name, $value) = $this->splitCompoundStringIntoParts($name, $value);
list($name, $value) = $this->sanitiseVariableName($name, $value);
list($name, $value) = $this->sanitiseVariableValue($name, $value);
$value = $this->resolveNestedVariables($value);
return array($name, $value);
}
/**
* Process the runtime filters.
*
* Called from the `VariableFactory`, passed as a callback in `$this->loadFromFile()`.
*
* @param string $name
* @param string $value
*
* @return array
*/
public function processFilters($name, $value)
{
list($name, $value) = $this->splitCompoundStringIntoParts($name, $value);
list($name, $value) = $this->sanitiseVariableName($name, $value);
list($name, $value) = $this->sanitiseVariableValue($name, $value);
return array($name, $value);
}
/**
* Read lines from the file, auto detecting line endings.
*
* @param string $filePath
*
* @return array
*/
protected function readLinesFromFile($filePath)
{
// Read file into an array of lines with auto-detected line endings
$autodetect = ini_get('auto_detect_line_endings');
ini_set('auto_detect_line_endings', '1');
$lines = file($filePath, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
ini_set('auto_detect_line_endings', $autodetect);
return $lines;
}
/**
* Determine if the line in the file is a comment, e.g. begins with a #.
*
* @param string $line
*
* @return bool
*/
protected function isComment($line)
{
return strpos(ltrim($line), '#') === 0;
}
/**
* Determine if the given line looks like it's setting a variable.
*
* @param string $line
*
* @return bool
*/
protected function looksLikeSetter($line)
{
return strpos($line, '=') !== false;
}
/**
* Split the compound string into parts.
*
* If the `$name` contains an `=` sign, then we split it into 2 parts, a `name` & `value`
* disregarding the `$value` passed in.
*
* @param string $name
* @param string $value
*
* @return array
*/
protected function splitCompoundStringIntoParts($name, $value)
{
if (strpos($name, '=') !== false) {
list($name, $value) = array_map('trim', explode('=', $name, 2));
}
return array($name, $value);
}
/**
* Strips quotes from the environment variable value.
*
* @param string $name
* @param string $value
*
* @throws \Dotenv\Exception\InvalidFileException
*
* @return array
*/
protected function sanitiseVariableValue($name, $value)
{
$value = trim($value);
if (!$value) {
return array($name, $value);
}
if ($this->beginsWithAQuote($value)) { // value starts with a quote
$quote = $value[0];
$regexPattern = sprintf(
'/^
%1$s # match a quote at the start of the value
( # capturing sub-pattern used
(?: # we do not need to capture this
[^%1$s\\\\] # any character other than a quote or backslash
|\\\\\\\\ # or two backslashes together
|\\\\%1$s # or an escaped quote e.g \"
)* # as many characters that match the previous rules
) # end of the capturing sub-pattern
%1$s # and the closing quote
.*$ # and discard any string after the closing quote
/mx',
$quote
);
$value = preg_replace($regexPattern, '$1', $value);
$value = str_replace("\\$quote", $quote, $value);
$value = str_replace('\\\\', '\\', $value);
} else {
$parts = explode(' #', $value, 2);
$value = trim($parts[0]);
// Unquoted values cannot contain whitespace
if (preg_match('/\s+/', $value) > 0) {
throw new InvalidFileException('Dotenv values containing spaces must be surrounded by quotes.');
}
}
return array($name, trim($value));
}
/**
* Resolve the nested variables.
*
* Look for {$varname} patterns in the variable value and replace with an
* existing environment variable.
*
* @param string $value
*
* @return mixed
*/
protected function resolveNestedVariables($value)
{
if (strpos($value, '$') !== false) {
$loader = $this;
$value = preg_replace_callback(
'/\${([a-zA-Z0-9_]+)}/',
function ($matchedPatterns) use ($loader) {
$nestedVariable = $loader->getEnvironmentVariable($matchedPatterns[1]);
if ($nestedVariable === null) {
return $matchedPatterns[0];
} else {
return $nestedVariable;
}
},
$value
);
}
return $value;
}
/**
* Strips quotes and the optional leading "export " from the environment variable name.
*
* @param string $name
* @param string $value
*
* @return array
*/
protected function sanitiseVariableName($name, $value)
{
$name = trim(str_replace(array('export ', '\'', '"'), '', $name));
return array($name, $value);
}
/**
* Determine if the given string begins with a quote.
*
* @param string $value
*
* @return bool
*/
protected function beginsWithAQuote($value)
{
return strpbrk($value[0], '"\'') !== false;
}
/**
* Search the different places for environment variables and return first value found.
*
* @param string $name
*
* @return string|null
*/
public function getEnvironmentVariable($name)
{
switch (true) {
case array_key_exists($name, $_ENV):
return $_ENV[$name];
case array_key_exists($name, $_SERVER):
return $_SERVER[$name];
default:
$value = getenv($name);
return $value === false ? null : $value; // switch getenv default to null
}
}
/**
* Set an environment variable.
*
* This is done using:
* - putenv,
* - $_ENV,
* - $_SERVER.
*
* The environment variable value is stripped of single and double quotes.
*
* @param string $name
* @param string|null $value
*
* @return void
*/
public function setEnvironmentVariable($name, $value = null)
{
list($name, $value) = $this->normaliseEnvironmentVariable($name, $value);
// Don't overwrite existing environment variables if we're immutable
// Ruby's dotenv does this with `ENV[key] ||= value`.
if ($this->immutable && $this->getEnvironmentVariable($name) !== null) {
return;
}
// If PHP is running as an Apache module and an existing
// Apache environment variable exists, overwrite it
if (function_exists('apache_getenv') && function_exists('apache_setenv') && apache_getenv($name)) {
apache_setenv($name, $value);
}
putenv("$name=$value");
$_ENV[$name] = $value;
$_SERVER[$name] = $value;
}
/**
* Clear an environment variable.
*
* This is not (currently) used by Dotenv but is provided as a utility
* method for 3rd party code.
*
* This is done using:
* - putenv,
* - unset($_ENV, $_SERVER).
*
* @param string $name
*
* @see setEnvironmentVariable()
*
* @return void
*/
public function clearEnvironmentVariable($name)
{
// Don't clear anything if we're immutable.
if ($this->immutable) {
return;
}
putenv($name);
unset($_ENV[$name], $_SERVER[$name]);
}
}
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