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<?php
/*!
* Hybridauth
* https://hybridauth.github.io | https://github.com/hybridauth/hybridauth
* (c) 2017 Hybridauth authors | https://hybridauth.github.io/license.html
*/
namespace Hybridauth\Adapter;
use Hybridauth\Exception\Exception;
use Hybridauth\Exception\InvalidApplicationCredentialsException;
use Hybridauth\Exception\InvalidAuthorizationStateException;
use Hybridauth\Exception\InvalidAuthorizationCodeException;
use Hybridauth\Exception\AuthorizationDeniedException;
use Hybridauth\Exception\InvalidAccessTokenException;
use Hybridauth\Data;
use Hybridauth\HttpClient;
/**
* This class can be used to simplify the authorization flow of OAuth 2 based service providers.
*
* Subclasses (i.e., providers adapters) can either use the already provided methods or override
* them when necessary.
*/
abstract class OAuth2 extends AbstractAdapter implements AdapterInterface
{
/**
* Client Identifier
*
* RFC6749: client_id REQUIRED. The client identifier issued to the client during
* the registration process described by Section 2.2.
*
* http://tools.ietf.org/html/rfc6749#section-2.2
*
* @var string
*/
protected $clientId = '';
/**
* Client Secret
*
* RFC6749: client_secret REQUIRED. The client secret. The client MAY omit the
* parameter if the client secret is an empty string.
*
* http://tools.ietf.org/html/rfc6749#section-2.2
*
* @var string
*/
protected $clientSecret = '';
/**
* Access Token Scope
*
* RFC6749: The authorization and token endpoints allow the client to specify the
* scope of the access request using the "scope" request parameter.
*
* http://tools.ietf.org/html/rfc6749#section-3.3
*
* @var string
*/
protected $scope = '';
/**
* Base URL to provider API
*
* This var will be used to build urls when sending signed requests
*
* @var string
*/
protected $apiBaseUrl = '';
/**
* Authorization Endpoint
*
* RFC6749: The authorization endpoint is used to interact with the resource
* owner and obtain an authorization grant.
*
* http://tools.ietf.org/html/rfc6749#section-3.1
*
* @var string
*/
protected $authorizeUrl = '';
/**
* Access Token Endpoint
*
* RFC6749: The token endpoint is used by the client to obtain an access token by
* presenting its authorization grant or refresh token.
*
* http://tools.ietf.org/html/rfc6749#section-3.2
*
* @var string
*/
protected $accessTokenUrl = '';
/**
* TokenInfo endpoint
*
* Access token validation. OPTIONAL.
*
* @var string
*/
protected $accessTokenInfoUrl = '';
/**
* IPD API Documentation
*
* OPTIONAL.
*
* @var string
*/
protected $apiDocumentation = '';
/**
* Redirection Endpoint or Callback
*
* RFC6749: After completing its interaction with the resource owner, the
* authorization server directs the resource owner's user-agent back to
* the client.
*
* http://tools.ietf.org/html/rfc6749#section-3.1.2
*
* @var string
*/
protected $callback = '';
/**
* Authorization Url Parameters
*
* @var array
*/
protected $AuthorizeUrlParameters = [];
/**
* Authorization Url Parameter encoding type
* @see https://www.php.net/manual/de/function.http-build-query.php
*
* @var string
*/
protected $AuthorizeUrlParametersEncType = PHP_QUERY_RFC1738;
/**
* Authorization Request State
*
* @var bool
*/
protected $supportRequestState = true;
/**
* Access Token name
*
* While most providers will use 'access_token' as name for the Access Token attribute, other do not.
* On the latter case, this should be set by sub classes.
*
* @var string
*/
protected $accessTokenName = 'access_token';
/**
* Authorization Request HTTP method.
*
* @see exchangeCodeForAccessToken()
*
* @var string
*/
protected $tokenExchangeMethod = 'POST';
/**
* Authorization Request URL parameters.
*
* Sub classes may change add any additional parameter when necessary.
*
* @see exchangeCodeForAccessToken()
*
* @var array
*/
protected $tokenExchangeParameters = [];
/**
* Authorization Request HTTP headers.
*
* Sub classes may add any additional header when necessary.
*
* @see exchangeCodeForAccessToken()
*
* @var array
*/
protected $tokenExchangeHeaders = [];
/**
* Refresh Token Request HTTP method.
*
* @see refreshAccessToken()
*
* @var string
*/
protected $tokenRefreshMethod = 'POST';
/**
* Refresh Token Request URL parameters.
*
* Sub classes may change add any additional parameter when necessary.
*
* @see refreshAccessToken()
*
* @var array|null
*/
protected $tokenRefreshParameters = null;
/**
* Refresh Token Request HTTP headers.
*
* Sub classes may add any additional header when necessary.
*
* @see refreshAccessToken()
*
* @var array
*/
protected $tokenRefreshHeaders = [];
/**
* Authorization Request URL parameters.
*
* Sub classes may change add any additional parameter when necessary.
*
* @see apiRequest()
*
* @var array
*/
protected $apiRequestParameters = [];
/**
* Authorization Request HTTP headers.
*
* Sub classes may add any additional header when necessary.
*
* @see apiRequest()
*
* @var array
*/
protected $apiRequestHeaders = [];
/**
* {@inheritdoc}
*/
protected function configure()
{
$this->clientId = $this->config->filter('keys')->get('id') ?: $this->config->filter('keys')->get('key');
$this->clientSecret = $this->config->filter('keys')->get('secret');
if (!$this->clientId || !$this->clientSecret) {
throw new InvalidApplicationCredentialsException(
'Your application id is required in order to connect to ' . $this->providerId
);
}
$this->scope = $this->config->exists('scope') ? $this->config->get('scope') : $this->scope;
if ($this->config->exists('tokens')) {
$this->setAccessToken($this->config->get('tokens'));
}
if ($this->config->exists('supportRequestState')) {
$this->supportRequestState = $this->config->get('supportRequestState');
}
$this->setCallback($this->config->get('callback'));
$this->setApiEndpoints($this->config->get('endpoints'));
}
/**
* {@inheritdoc}
*/
protected function initialize()
{
$this->AuthorizeUrlParameters = [
'response_type' => 'code',
'client_id' => $this->clientId,
'redirect_uri' => $this->callback,
'scope' => $this->scope,
];
$this->tokenExchangeParameters = [
'client_id' => $this->clientId,
'client_secret' => $this->clientSecret,
'grant_type' => 'authorization_code',
'redirect_uri' => $this->callback
];
$refreshToken = $this->getStoredData('refresh_token');
if (!empty($refreshToken)) {
$this->tokenRefreshParameters = [
'grant_type' => 'refresh_token',
'refresh_token' => $refreshToken,
];
}
$this->apiRequestHeaders = [
'Authorization' => 'Bearer ' . $this->getStoredData('access_token')
];
}
/**
* {@inheritdoc}
*/
public function authenticate()
{
$this->logger->info(sprintf('%s::authenticate()', get_class($this)));
if ($this->isConnected()) {
return true;
}
try {
$this->authenticateCheckError();
$code = filter_input($_SERVER['REQUEST_METHOD'] === 'POST' ? INPUT_POST : INPUT_GET, 'code');
if (empty($code)) {
$this->authenticateBegin();
} else {
$this->authenticateFinish();
}
} catch (Exception $e) {
$this->clearStoredData();
throw $e;
}
return null;
}
/**
* {@inheritdoc}
*/
public function isConnected()
{
if ((bool)$this->getStoredData('access_token')) {
return (!$this->hasAccessTokenExpired() || $this->isRefreshTokenAvailable());
}
return false;
}
/**
* If we can use a refresh token, then an expired token does not stop us being connected.
*
* @return bool
*/
public function isRefreshTokenAvailable()
{
return is_array($this->tokenRefreshParameters);
}
/**
* Authorization Request Error Response
*
* RFC6749: If the request fails due to a missing, invalid, or mismatching
* redirection URI, or if the client identifier is missing or invalid,
* the authorization server SHOULD inform the resource owner of the error.
*
* http://tools.ietf.org/html/rfc6749#section-4.1.2.1
*
* @throws \Hybridauth\Exception\InvalidAuthorizationCodeException
* @throws \Hybridauth\Exception\AuthorizationDeniedException
*/
protected function authenticateCheckError()
{
$error = filter_input(INPUT_GET, 'error', FILTER_SANITIZE_SPECIAL_CHARS);
if (!empty($error)) {
$error_description = filter_input(INPUT_GET, 'error_description', FILTER_SANITIZE_SPECIAL_CHARS);
$error_uri = filter_input(INPUT_GET, 'error_uri', FILTER_SANITIZE_SPECIAL_CHARS);
$collated_error = sprintf('Provider returned an error: %s %s %s', $error, $error_description, $error_uri);
if ($error == 'access_denied') {
throw new AuthorizationDeniedException($collated_error);
}
throw new InvalidAuthorizationCodeException($collated_error);
}
}
/**
* Initiate the authorization protocol
*
* Build Authorization URL for Authorization Request and redirect the user-agent to the
* Authorization Server.
*/
protected function authenticateBegin()
{
$authUrl = $this->getAuthorizeUrl();
$this->logger->debug(sprintf('%s::authenticateBegin(), redirecting user to:', get_class($this)), [$authUrl]);
HttpClient\Util::redirect($authUrl);
}
/**
* Finalize the authorization process
*
* @throws \Hybridauth\Exception\HttpClientFailureException
* @throws \Hybridauth\Exception\HttpRequestFailedException
* @throws InvalidAccessTokenException
* @throws InvalidAuthorizationStateException
*/
protected function authenticateFinish()
{
$this->logger->debug(
sprintf('%s::authenticateFinish(), callback url:', get_class($this)),
[HttpClient\Util::getCurrentUrl(true)]
);
$state = filter_input($_SERVER['REQUEST_METHOD'] === 'POST' ? INPUT_POST : INPUT_GET, 'state');
$code = filter_input($_SERVER['REQUEST_METHOD'] === 'POST' ? INPUT_POST : INPUT_GET, 'code');
/**
* Authorization Request State
*
* RFC6749: state : RECOMMENDED. An opaque value used by the client to maintain
* state between the request and callback. The authorization server includes
* this value when redirecting the user-agent back to the client.
*
* http://tools.ietf.org/html/rfc6749#section-4.1.1
*/
if ($this->supportRequestState
&& (!$state || $this->getStoredData('authorization_state') != $state)
) {
$this->deleteStoredData('authorization_state');
throw new InvalidAuthorizationStateException(
'The authorization state [state=' . substr(htmlentities($state), 0, 100) . '] '
. 'of this page is either invalid or has already been consumed.'
);
}
/**
* Authorization Request Code
*
* RFC6749: If the resource owner grants the access request, the authorization
* server issues an authorization code and delivers it to the client:
*
* http://tools.ietf.org/html/rfc6749#section-4.1.2
*/
$response = $this->exchangeCodeForAccessToken($code);
$this->validateAccessTokenExchange($response);
$this->initialize();
}
/**
* Build Authorization URL for Authorization Request
*
* RFC6749: The client constructs the request URI by adding the following
* $parameters to the query component of the authorization endpoint URI:
*
* - response_type REQUIRED. Value MUST be set to "code".
* - client_id REQUIRED.
* - redirect_uri OPTIONAL.
* - scope OPTIONAL.
* - state RECOMMENDED.
*
* http://tools.ietf.org/html/rfc6749#section-4.1.1
*
* Sub classes may redefine this method when necessary.
*
* @param array $parameters
*
* @return string Authorization URL
*/
protected function getAuthorizeUrl($parameters = [])
{
$this->AuthorizeUrlParameters = !empty($parameters)
? $parameters
: array_replace(
(array)$this->AuthorizeUrlParameters,
(array)$this->config->get('authorize_url_parameters')
);
if ($this->supportRequestState) {
if (!isset($this->AuthorizeUrlParameters['state'])) {
$this->AuthorizeUrlParameters['state'] = 'HA-' . str_shuffle('ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890');
}
$this->storeData('authorization_state', $this->AuthorizeUrlParameters['state']);
}
$queryParams = http_build_query($this->AuthorizeUrlParameters, '', '&', $this->AuthorizeUrlParametersEncType);
return $this->authorizeUrl . '?' . $queryParams;
}
/**
* Access Token Request
*
* This method will exchange the received $code in loginFinish() with an Access Token.
*
* RFC6749: The client makes a request to the token endpoint by sending the
* following parameters using the "application/x-www-form-urlencoded"
* with a character encoding of UTF-8 in the HTTP request entity-body:
*
* - grant_type REQUIRED. Value MUST be set to "authorization_code".
* - code REQUIRED. The authorization code received from the authorization server.
* - redirect_uri REQUIRED.
* - client_id REQUIRED.
*
* http://tools.ietf.org/html/rfc6749#section-4.1.3
*
* @param string $code
*
* @return string Raw Provider API response
* @throws \Hybridauth\Exception\HttpClientFailureException
* @throws \Hybridauth\Exception\HttpRequestFailedException
*/
protected function exchangeCodeForAccessToken($code)
{
$this->tokenExchangeParameters['code'] = $code;
$response = $this->httpClient->request(
$this->accessTokenUrl,
$this->tokenExchangeMethod,
$this->tokenExchangeParameters,
$this->tokenExchangeHeaders
);
$this->validateApiResponse('Unable to exchange code for API access token');
return $response;
}
/**
* Validate Access Token Response
*
* RFC6749: If the access token request is valid and authorized, the
* authorization server issues an access token and optional refresh token.
* If the request client authentication failed or is invalid, the authorization
* server returns an error response as described in Section 5.2.
*
* Example of a successful response:
*
* HTTP/1.1 200 OK
* Content-Type: application/json;charset=UTF-8
* Cache-Control: no-store
* Pragma: no-cache
*
* {
* "access_token":"2YotnFZFEjr1zCsicMWpAA",
* "token_type":"example",
* "expires_in":3600,
* "refresh_token":"tGzv3JOkF0XG5Qx2TlKWIA",
* "example_parameter":"example_value"
* }
*
* http://tools.ietf.org/html/rfc6749#section-4.1.4
*
* This method uses Data_Parser to attempt to decodes the raw $response (usually JSON)
* into a data collection.
*
* @param string $response
*
* @return \Hybridauth\Data\Collection
* @throws InvalidAccessTokenException
*/
protected function validateAccessTokenExchange($response)
{
$data = (new Data\Parser())->parse($response);
$collection = new Data\Collection($data);
if (!$collection->exists('access_token')) {
throw new InvalidAccessTokenException(
'Provider returned no access_token: ' . htmlentities($response)
);
}
$this->storeData('access_token', $collection->get('access_token'));
$this->storeData('token_type', $collection->get('token_type'));
if ($collection->get('refresh_token')) {
$this->storeData('refresh_token', $collection->get('refresh_token'));
}
// calculate when the access token expire
if ($collection->exists('expires_in')) {
$expires_at = time() + (int)$collection->get('expires_in');
$this->storeData('expires_in', $collection->get('expires_in'));
$this->storeData('expires_at', $expires_at);
}
$this->deleteStoredData('authorization_state');
$this->initialize();
return $collection;
}
/**
* Refreshing an Access Token
*
* RFC6749: If the authorization server issued a refresh token to the
* client, the client makes a refresh request to the token endpoint by
* adding the following parameters ... in the HTTP request entity-body:
*
* - grant_type REQUIRED. Value MUST be set to "refresh_token".
* - refresh_token REQUIRED. The refresh token issued to the client.
* - scope OPTIONAL.
*
* http://tools.ietf.org/html/rfc6749#section-6
*
* This method is similar to exchangeCodeForAccessToken(). The only
* difference is here we exchange refresh_token for a new access_token.
*
* @param array $parameters
*
* @return string|null Raw Provider API response, or null if we cannot refresh
* @throws \Hybridauth\Exception\HttpClientFailureException
* @throws \Hybridauth\Exception\HttpRequestFailedException
* @throws InvalidAccessTokenException
*/
public function refreshAccessToken($parameters = [])
{
$this->tokenRefreshParameters = !empty($parameters)
? $parameters
: $this->tokenRefreshParameters;
if (!$this->isRefreshTokenAvailable()) {
return null;
}
$response = $this->httpClient->request(
$this->accessTokenUrl,
$this->tokenRefreshMethod,
$this->tokenRefreshParameters,
$this->tokenRefreshHeaders
);
$this->validateApiResponse('Unable to refresh the access token');
$this->validateRefreshAccessToken($response);
return $response;
}
/**
* Check whether access token has expired
*
* @param int|null $time
* @return bool|null
*/
public function hasAccessTokenExpired($time = null)
{
if ($time === null) {
$time = time();
}
$expires_at = $this->getStoredData('expires_at');
if (!$expires_at) {
return null;
}
return $expires_at <= $time;
}
/**
* Validate Refresh Access Token Request
*
* RFC6749: If valid and authorized, the authorization server issues an
* access token as described in Section 5.1. If the request failed
* verification or is invalid, the authorization server returns an error
* response as described in Section 5.2.
*
* http://tools.ietf.org/html/rfc6749#section-6
* http://tools.ietf.org/html/rfc6749#section-5.1
* http://tools.ietf.org/html/rfc6749#section-5.2
*
* This method simply use validateAccessTokenExchange(), however sub
* classes may redefine it when necessary.
*
* @param $response
*
* @return \Hybridauth\Data\Collection
* @throws InvalidAccessTokenException
*/
protected function validateRefreshAccessToken($response)
{
return $this->validateAccessTokenExchange($response);
}
/**
* Send a signed request to provider API
*
* RFC6749: Accessing Protected Resources: The client accesses protected
* resources by presenting the access token to the resource server. The
* resource server MUST validate the access token and ensure that it has
* not expired and that its scope covers the requested resource.
*
* Note: Since the specifics of error responses is beyond the scope of
* RFC6749 and OAuth specifications, Hybridauth will consider any HTTP
* status code that is different than '200 OK' as an ERROR.
*
* http://tools.ietf.org/html/rfc6749#section-7
*
* @param string $url
* @param string $method
* @param array $parameters
* @param array $headers
* @param bool $multipart
*
* @return mixed
* @throws \Hybridauth\Exception\HttpClientFailureException
* @throws \Hybridauth\Exception\HttpRequestFailedException
* @throws InvalidAccessTokenException
*/
public function apiRequest($url, $method = 'GET', $parameters = [], $headers = [], $multipart = false)
{
// refresh tokens if needed
$this->maintainToken();
if ($this->hasAccessTokenExpired() === true) {
$this->refreshAccessToken();
}
if (strrpos($url, 'http://') !== 0 && strrpos($url, 'https://') !== 0) {
$url = rtrim($this->apiBaseUrl, '/') . '/' . ltrim($url, '/');
}
$parameters = array_replace($this->apiRequestParameters, (array)$parameters);
$headers = array_replace($this->apiRequestHeaders, (array)$headers);
$response = $this->httpClient->request(
$url,
$method, // HTTP Request Method. Defaults to GET.
$parameters, // Request Parameters
$headers, // Request Headers
$multipart // Is request multipart
);
$this->validateApiResponse('Signed API request to ' . $url . ' has returned an error');
$response = (new Data\Parser())->parse($response);
return $response;
}
}
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