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<?php
/*
* This file is part of composer/spdx-licenses.
*
* (c) Composer <https://github.com/composer>
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace Composer\Spdx;
class SpdxLicenses
{
/** @var string */
const LICENSES_FILE = 'spdx-licenses.json';
/** @var string */
const EXCEPTIONS_FILE = 'spdx-exceptions.json';
/**
* Contains all the licenses.
*
* The array is indexed by license identifiers, which contain
* a numerically indexed array with license details.
*
* [ lowercased license identifier =>
* [ 0 => identifier (string), 1 => full name (string), 2 => osi certified (bool), 3 => deprecated (bool) ]
* , ...
* ]
*
* @var array<string, array{0: string, 1: string, 2: bool, 3: bool}>
*/
private $licenses;
/**
* @var string
*/
private $licensesExpression;
/**
* Contains all the license exceptions.
*
* The array is indexed by license exception identifiers, which contain
* a numerically indexed array with license exception details.
*
* [ lowercased exception identifier =>
* [ 0 => exception identifier (string), 1 => full name (string) ]
* , ...
* ]
*
* @var array<string, array{0: string, 1: string}>
*/
private $exceptions;
/**
* @var string
*/
private $exceptionsExpression;
public function __construct()
{
$this->loadLicenses();
$this->loadExceptions();
}
/**
* Returns license metadata by license identifier.
*
* This function adds a link to the full license text to the license metadata.
* The array returned is in the form of:
*
* [ 0 => full name (string), 1 => osi certified, 2 => link to license text (string), 3 => deprecation status (bool) ]
*
* @param string $identifier
*
* @return array{0: string, 1: bool, 2: string, 3: bool}|null
*/
public function getLicenseByIdentifier($identifier)
{
$key = strtolower($identifier);
if (!isset($this->licenses[$key])) {
return null;
}
list($identifier, $name, $isOsiApproved, $isDeprecatedLicenseId) = $this->licenses[$key];
return array(
$name,
$isOsiApproved,
'https://spdx.org/licenses/' . $identifier . '.html#licenseText',
$isDeprecatedLicenseId,
);
}
/**
* Returns all licenses information, keyed by the lowercased license identifier.
*
* @return array{0: string, 1: string, 2: bool, 3: bool}[] Each item is [ 0 => identifier (string), 1 => full name (string), 2 => osi certified (bool), 3 => deprecated (bool) ]
*/
public function getLicenses()
{
return $this->licenses;
}
/**
* Returns license exception metadata by license exception identifier.
*
* This function adds a link to the full license exception text to the license exception metadata.
* The array returned is in the form of:
*
* [ 0 => full name (string), 1 => link to license text (string) ]
*
* @param string $identifier
*
* @return array{0: string, 1: string}|null
*/
public function getExceptionByIdentifier($identifier)
{
$key = strtolower($identifier);
if (!isset($this->exceptions[$key])) {
return null;
}
list($identifier, $name) = $this->exceptions[$key];
return array(
$name,
'https://spdx.org/licenses/' . $identifier . '.html#licenseExceptionText',
);
}
/**
* Returns the short identifier of a license (or license exception) by full name.
*
* @param string $name
*
* @return string|null
*/
public function getIdentifierByName($name)
{
foreach ($this->licenses as $licenseData) {
if ($licenseData[1] === $name) {
return $licenseData[0];
}
}
foreach ($this->exceptions as $licenseData) {
if ($licenseData[1] === $name) {
return $licenseData[0];
}
}
return null;
}
/**
* Returns the OSI Approved status for a license by identifier.
*
* @param string $identifier
*
* @return bool
*/
public function isOsiApprovedByIdentifier($identifier)
{
return $this->licenses[strtolower($identifier)][2];
}
/**
* Returns the deprecation status for a license by identifier.
*
* @param string $identifier
*
* @return bool
*/
public function isDeprecatedByIdentifier($identifier)
{
return $this->licenses[strtolower($identifier)][3];
}
/**
* @param string[]|string $license
*
* @throws \InvalidArgumentException
*
* @return bool
*/
public function validate($license)
{
if (is_array($license)) {
$count = count($license);
if ($count !== count(array_filter($license, 'is_string'))) {
throw new \InvalidArgumentException('Array of strings expected.');
}
$license = $count > 1 ? '(' . implode(' OR ', $license) . ')' : (string) reset($license);
}
if (!is_string($license)) {
throw new \InvalidArgumentException(sprintf(
'Array or String expected, %s given.',
gettype($license)
));
}
return $this->isValidLicenseString($license);
}
/**
* @return string
*/
public static function getResourcesDir()
{
return dirname(__DIR__) . '/../data/Composer/res';
}
/**
* @return void
*/
private function loadLicenses()
{
if (null !== $this->licenses) {
return;
}
$json = file_get_contents(self::getResourcesDir() . '/' . self::LICENSES_FILE);
if (false === $json) {
throw new \RuntimeException('Missing license file in ' . self::getResourcesDir() . '/' . self::LICENSES_FILE);
}
$this->licenses = array();
foreach (json_decode($json, true) as $identifier => $license) {
$this->licenses[strtolower($identifier)] = array($identifier, $license[0], $license[1], $license[2]);
}
}
/**
* @return void
*/
private function loadExceptions()
{
if (null !== $this->exceptions) {
return;
}
$json = file_get_contents(self::getResourcesDir() . '/' . self::EXCEPTIONS_FILE);
if (false === $json) {
throw new \RuntimeException('Missing exceptions file in ' . self::getResourcesDir() . '/' . self::EXCEPTIONS_FILE);
}
$this->exceptions = array();
foreach (json_decode($json, true) as $identifier => $exception) {
$this->exceptions[strtolower($identifier)] = array($identifier, $exception[0]);
}
}
/**
* @return string
*/
private function getLicensesExpression()
{
if (null === $this->licensesExpression) {
$licenses = array_map('preg_quote', array_keys($this->licenses));
rsort($licenses);
$licenses = implode('|', $licenses);
$this->licensesExpression = $licenses;
}
return $this->licensesExpression;
}
/**
* @return string
*/
private function getExceptionsExpression()
{
if (null === $this->exceptionsExpression) {
$exceptions = array_map('preg_quote', array_keys($this->exceptions));
rsort($exceptions);
$exceptions = implode('|', $exceptions);
$this->exceptionsExpression = $exceptions;
}
return $this->exceptionsExpression;
}
/**
* @param string $license
*
* @throws \RuntimeException
*
* @return bool
*/
private function isValidLicenseString($license)
{
if (isset($this->licenses[strtolower($license)])) {
return true;
}
$licenses = $this->getLicensesExpression();
$exceptions = $this->getExceptionsExpression();
$regex = <<<REGEX
{
(?(DEFINE)
# idstring: 1*( ALPHA / DIGIT / - / . )
(?<idstring>[\pL\pN.-]{1,})
# license-id: taken from list
(?<licenseid>{$licenses})
# license-exception-id: taken from list
(?<licenseexceptionid>{$exceptions})
# license-ref: [DocumentRef-1*(idstring):]LicenseRef-1*(idstring)
(?<licenseref>(?:DocumentRef-(?&idstring):)?LicenseRef-(?&idstring))
# simple-expresssion: license-id / license-id+ / license-ref
(?<simple_expression>(?&licenseid)\+? | (?&licenseid) | (?&licenseref))
# compound-expression: 1*(
# simple-expression /
# simple-expression WITH license-exception-id /
# compound-expression AND compound-expression /
# compound-expression OR compound-expression
# ) / ( compound-expression ) )
(?<compound_head>
(?&simple_expression) ( \s+ WITH \s+ (?&licenseexceptionid))?
| \( \s* (?&compound_expression) \s* \)
)
(?<compound_expression>
(?&compound_head) (?: \s+ (?:AND|OR) \s+ (?&compound_expression))?
)
# license-expression: 1*1(simple-expression / compound-expression)
(?<license_expression>(?&compound_expression) | (?&simple_expression))
) # end of define
^(NONE | NOASSERTION | (?&license_expression))$
}xi
REGEX;
$match = preg_match($regex, $license);
if (0 === $match) {
return false;
}
if (false === $match) {
throw new \RuntimeException('Regex failed to compile/run.');
}
return true;
}
}