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<?php
namespace Aws\Token;
use Aws\Exception\TokenException;
use GuzzleHttp\Promise;
/**
* Token that comes from the SSO provider
*/
class SsoTokenProvider implements RefreshableTokenProviderInterface
{
use ParsesIniTrait;
const ENV_PROFILE = 'AWS_PROFILE';
private $ssoProfileName;
private $filename;
private $ssoOidcClient;
/**
* Constructs a new SSO token object, with the specified AWS
* token
*
* @param string $token Security token to use
* @param int $expires UNIX timestamp for when the token expires
*/
public function __construct($ssoProfileName, $filename = null, $ssoOidcClient = null) {
$profileName = getenv(self::ENV_PROFILE) ?: 'default';
$this->ssoProfileName = !empty($ssoProfileName) ? $ssoProfileName : $profileName;
$this->filename = !empty($filename)
? $filename :
self::getHomeDir() . '/.aws/config';
$this->ssoOidcClient = $ssoOidcClient;
}
/*
* Loads cached sso credentials
*
* @return PromiseInterface
*/
public function __invoke()
{
return Promise\Coroutine::of(function () {
if (!@is_readable($this->filename)) {
throw new TokenException("Cannot read token from $this->filename");
}
$profiles = self::loadProfiles($this->filename);
if (!isset($profiles[$this->ssoProfileName])) {
throw new TokenException("Profile {$this->ssoProfileName} does not exist in {$this->filename}.");
}
$ssoProfile = $profiles[$this->ssoProfileName];
if (empty($ssoProfile['sso_session'])) {
throw new TokenException(
"Profile {$this->ssoProfileName} in {$this->filename} must contain an sso_session."
);
}
$sessionProfileName = 'sso-session ' . $ssoProfile['sso_session'];
if (empty($profiles[$sessionProfileName])) {
throw new TokenException(
"Profile {$this->ssoProfileName} does not exist in {$this->filename}"
);
}
$sessionProfileData = $profiles[$sessionProfileName];
if (empty($sessionProfileData['sso_start_url'])
|| empty($sessionProfileData['sso_region'])
) {
throw new TokenException(
"Profile {$this->ssoProfileName} in {$this->filename} must contain the following keys: "
. "sso_start_url and sso_region."
);
}
$tokenLocation = self::getTokenLocation($ssoProfile['sso_session']);
if (!@is_readable($tokenLocation)) {
throw new TokenException("Unable to read token file at $tokenLocation");
}
$tokenData = $this->getTokenData($tokenLocation);
$this->validateTokenData($tokenLocation, $tokenData);
yield new SsoToken(
$tokenData['accessToken'],
$tokenData['expiresAt'],
isset($tokenData['refreshToken']) ? $tokenData['refreshToken'] : null,
isset($tokenData['clientId']) ? $tokenData['clientId'] : null,
isset($tokenData['clientSecret']) ? $tokenData['clientSecret'] : null,
isset($tokenData['registrationExpiresAt']) ? $tokenData['registrationExpiresAt'] : null,
isset($tokenData['region']) ? $tokenData['region'] : null,
isset($tokenData['startUrl']) ? $tokenData['startUrl'] : null
);
});
}
/**
* Refreshes the token
* @return mixed|null
*/
public function refresh() {
try {
//try to reload from disk
$token = $this();
if (
$token instanceof SsoToken
&& !$token->shouldAttemptRefresh()
) {
return $token;
}
} finally {
//if reload from disk fails, try refreshing
$tokenLocation = self::getTokenLocation($this->ssoProfileName);
$tokenData = $this->getTokenData($tokenLocation);
if (
empty($this->ssoOidcClient)
|| empty($tokenData['startUrl'])
) {
throw new TokenException(
"Cannot refresh this token without an 'ssooidcClient' "
. "and a 'start_url'"
);
}
$response = $this->ssoOidcClient->createToken([
'clientId' => $tokenData['clientId'],
'clientSecret' => $tokenData['clientSecret'],
'grantType' => 'refresh_token', // REQUIRED
'refreshToken' => $tokenData['refreshToken'],
]);
if ($response['@metadata']['statusCode'] == 200) {
$tokenData['accessToken'] = $response['accessToken'];
$tokenData['expiresAt'] = time () + $response['expiresIn'];
$tokenData['refreshToken'] = $response['refreshToken'];
$token = new SsoToken(
$tokenData['accessToken'],
$tokenData['expiresAt'],
$tokenData['refreshToken'],
isset($tokenData['clientId']) ? $tokenData['clientId'] : null,
isset($tokenData['clientSecret']) ? $tokenData['clientSecret'] : null,
isset($tokenData['registrationExpiresAt']) ? $tokenData['registrationExpiresAt'] : null,
isset($tokenData['region']) ? $tokenData['region'] : null,
isset($tokenData['startUrl']) ? $tokenData['startUrl'] : null );
$this->writeNewTokenDataToDisk($tokenData, $tokenLocation);
return $token;
}
}
}
public function shouldAttemptRefresh()
{
$tokenLocation = self::getTokenLocation($this->ssoProfileName);
$tokenData = $this->getTokenData($tokenLocation);
return strtotime("-10 minutes") >= strtotime($tokenData['expiresAt']);
}
/**
* @param $sso_session
* @return string
*/
public static function getTokenLocation($sso_session)
{
return self::getHomeDir()
. '/.aws/sso/cache/'
. utf8_encode(sha1($sso_session))
. ".json";
}
/**
* @param $tokenLocation
* @return array
*/
function getTokenData($tokenLocation)
{
return json_decode(file_get_contents($tokenLocation), true);
}
/**
* @param $tokenData
* @param $tokenLocation
* @return mixed
*/
private function validateTokenData($tokenLocation, $tokenData)
{
if (empty($tokenData['accessToken']) || empty($tokenData['expiresAt'])) {
throw new TokenException(
"Token file at {$tokenLocation} must contain an access token and an expiration"
);
}
try {
$expiration = strtotime($tokenData['expiresAt']);
} catch (\Exception $e) {
throw new TokenException("Cached SSO token returned an invalid expiration");
}
if ($expiration > time()) {
throw new TokenException("Cached SSO token returned an expired token");
}
return $tokenData;
}
/**
* @param array $tokenData
* @param string $tokenLocation
* @return void
*/
private function writeNewTokenDataToDisk(array $tokenData, $tokenLocation)
{
$tokenData['expiresAt'] = gmdate(
'Y-m-d\TH:i:s\Z',
$tokenData['expiresAt']
);
file_put_contents($tokenLocation, json_encode(array_filter($tokenData)));
}
}
|
