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<?php
namespace OAuth\OAuth2\Service;
use OAuth\Common\Consumer\CredentialsInterface;
use OAuth\Common\Exception\Exception;
use OAuth\Common\Service\AbstractService as BaseAbstractService;
use OAuth\Common\Storage\TokenStorageInterface;
use OAuth\Common\Http\Exception\TokenResponseException;
use OAuth\Common\Http\Client\ClientInterface;
use OAuth\Common\Http\Uri\UriInterface;
use OAuth\OAuth2\Service\Exception\InvalidAuthorizationStateException;
use OAuth\OAuth2\Service\Exception\InvalidScopeException;
use OAuth\OAuth2\Service\Exception\MissingRefreshTokenException;
use OAuth\Common\Token\TokenInterface;
use OAuth\Common\Token\Exception\ExpiredTokenException;
abstract class AbstractService extends BaseAbstractService implements ServiceInterface
{
/** @const OAUTH_VERSION */
const OAUTH_VERSION = 2;
/** @var array */
protected $scopes;
/** @var UriInterface|null */
protected $baseApiUri;
/** @var bool */
protected $stateParameterInAuthUrl;
/** @var string */
protected $apiVersion;
/**
* @param CredentialsInterface $credentials
* @param ClientInterface $httpClient
* @param TokenStorageInterface $storage
* @param array $scopes
* @param UriInterface|null $baseApiUri
* @param bool $stateParameterInAutUrl
* @param string $apiVersion
*
* @throws InvalidScopeException
*/
public function __construct(
CredentialsInterface $credentials,
ClientInterface $httpClient,
TokenStorageInterface $storage,
$scopes = array(),
UriInterface $baseApiUri = null,
$stateParameterInAutUrl = false,
$apiVersion = ""
) {
parent::__construct($credentials, $httpClient, $storage);
$this->stateParameterInAuthUrl = $stateParameterInAutUrl;
foreach ($scopes as $scope) {
if (!$this->isValidScope($scope)) {
throw new InvalidScopeException('Scope ' . $scope . ' is not valid for service ' . get_class($this));
}
}
$this->scopes = $scopes;
$this->baseApiUri = $baseApiUri;
$this->apiVersion = $apiVersion;
}
/**
* {@inheritdoc}
*/
public function getAuthorizationUri(array $additionalParameters = array())
{
$parameters = array_merge(
$additionalParameters,
array(
'type' => 'web_server',
'client_id' => $this->credentials->getConsumerId(),
'redirect_uri' => $this->credentials->getCallbackUrl(),
'response_type' => 'code',
)
);
$parameters['scope'] = implode($this->getScopesDelimiter(), $this->scopes);
if ($this->needsStateParameterInAuthUrl()) {
if (!isset($parameters['state'])) {
$parameters['state'] = $this->generateAuthorizationState();
}
$this->storeAuthorizationState($parameters['state']);
}
// Build the url
$url = clone $this->getAuthorizationEndpoint();
foreach ($parameters as $key => $val) {
$url->addToQuery($key, $val);
}
return $url;
}
/**
* {@inheritdoc}
*/
public function requestAccessToken($code, $state = null)
{
if (null !== $state) {
$this->validateAuthorizationState($state);
}
$bodyParams = array(
'code' => $code,
'client_id' => $this->credentials->getConsumerId(),
'client_secret' => $this->credentials->getConsumerSecret(),
'redirect_uri' => $this->credentials->getCallbackUrl(),
'grant_type' => 'authorization_code',
);
$responseBody = $this->httpClient->retrieveResponse(
$this->getAccessTokenEndpoint(),
$bodyParams,
$this->getExtraOAuthHeaders()
);
$token = $this->parseAccessTokenResponse($responseBody);
$this->storage->storeAccessToken($this->service(), $token);
return $token;
}
/**
* Sends an authenticated API request to the path provided.
* If the path provided is not an absolute URI, the base API Uri (must be passed into constructor) will be used.
*
* @param string|UriInterface $path
* @param string $method HTTP method
* @param array $body Request body if applicable.
* @param array $extraHeaders Extra headers if applicable. These will override service-specific
* any defaults.
*
* @return string
*
* @throws ExpiredTokenException
* @throws Exception
*/
public function request($path, $method = 'GET', $body = null, array $extraHeaders = array())
{
$uri = $this->determineRequestUriFromPath($path, $this->baseApiUri);
$token = $this->storage->retrieveAccessToken($this->service());
if ($token->getEndOfLife() !== TokenInterface::EOL_NEVER_EXPIRES
&& $token->getEndOfLife() !== TokenInterface::EOL_UNKNOWN
&& time() > $token->getEndOfLife()
) {
throw new ExpiredTokenException(
sprintf(
'Token expired on %s at %s',
date('m/d/Y', $token->getEndOfLife()),
date('h:i:s A', $token->getEndOfLife())
)
);
}
// add the token where it may be needed
if (static::AUTHORIZATION_METHOD_HEADER_OAUTH === $this->getAuthorizationMethod()) {
$extraHeaders = array_merge(array('Authorization' => 'OAuth ' . $token->getAccessToken()), $extraHeaders);
} elseif (static::AUTHORIZATION_METHOD_QUERY_STRING === $this->getAuthorizationMethod()) {
$uri->addToQuery('access_token', $token->getAccessToken());
} elseif (static::AUTHORIZATION_METHOD_QUERY_STRING_V2 === $this->getAuthorizationMethod()) {
$uri->addToQuery('oauth2_access_token', $token->getAccessToken());
} elseif (static::AUTHORIZATION_METHOD_QUERY_STRING_V3 === $this->getAuthorizationMethod()) {
$uri->addToQuery('apikey', $token->getAccessToken());
} elseif (static::AUTHORIZATION_METHOD_QUERY_STRING_V4 === $this->getAuthorizationMethod()) {
$uri->addToQuery('auth', $token->getAccessToken());
} elseif (static::AUTHORIZATION_METHOD_HEADER_BEARER === $this->getAuthorizationMethod()) {
$extraHeaders = array_merge(array('Authorization' => 'Bearer ' . $token->getAccessToken()), $extraHeaders);
}
$extraHeaders = array_merge($this->getExtraApiHeaders(), $extraHeaders);
return $this->httpClient->retrieveResponse($uri, $body, $extraHeaders, $method);
}
/**
* Accessor to the storage adapter to be able to retrieve tokens
*
* @return TokenStorageInterface
*/
public function getStorage()
{
return $this->storage;
}
/**
* Refreshes an OAuth2 access token.
*
* @param TokenInterface $token
*
* @return TokenInterface $token
*
* @throws MissingRefreshTokenException
*/
public function refreshAccessToken(TokenInterface $token)
{
$refreshToken = $token->getRefreshToken();
if (empty($refreshToken)) {
throw new MissingRefreshTokenException();
}
$parameters = array(
'grant_type' => 'refresh_token',
'type' => 'web_server',
'client_id' => $this->credentials->getConsumerId(),
'client_secret' => $this->credentials->getConsumerSecret(),
'refresh_token' => $refreshToken,
);
$responseBody = $this->httpClient->retrieveResponse(
$this->getAccessTokenEndpoint(),
$parameters,
$this->getExtraOAuthHeaders()
);
$token = $this->parseAccessTokenResponse($responseBody);
$this->storage->storeAccessToken($this->service(), $token);
return $token;
}
/**
* Return whether or not the passed scope value is valid.
*
* @param string $scope
*
* @return bool
*/
public function isValidScope($scope)
{
$reflectionClass = new \ReflectionClass(get_class($this));
return in_array($scope, $reflectionClass->getConstants(), true);
}
/**
* Check if the given service need to generate a unique state token to build the authorization url
*
* @return bool
*/
public function needsStateParameterInAuthUrl()
{
return $this->stateParameterInAuthUrl;
}
/**
* Validates the authorization state against a given one
*
* @param string $state
* @throws InvalidAuthorizationStateException
*/
protected function validateAuthorizationState($state)
{
if ($this->retrieveAuthorizationState() !== $state) {
throw new InvalidAuthorizationStateException();
}
}
/**
* Generates a random string to be used as state
*
* @return string
*/
protected function generateAuthorizationState()
{
return md5(rand());
}
/**
* Retrieves the authorization state for the current service
*
* @return string
*/
protected function retrieveAuthorizationState()
{
return $this->storage->retrieveAuthorizationState($this->service());
}
/**
* Stores a given authorization state into the storage
*
* @param string $state
*/
protected function storeAuthorizationState($state)
{
$this->storage->storeAuthorizationState($this->service(), $state);
}
/**
* Return any additional headers always needed for this service implementation's OAuth calls.
*
* @return array
*/
protected function getExtraOAuthHeaders()
{
return array();
}
/**
* Return any additional headers always needed for this service implementation's API calls.
*
* @return array
*/
protected function getExtraApiHeaders()
{
return array();
}
/**
* Parses the access token response and returns a TokenInterface.
*
* @abstract
*
* @param string $responseBody
*
* @return TokenInterface
*
* @throws TokenResponseException
*/
abstract protected function parseAccessTokenResponse($responseBody);
/**
* Returns a class constant from ServiceInterface defining the authorization method used for the API
* Header is the sane default.
*
* @return int
*/
protected function getAuthorizationMethod()
{
return static::AUTHORIZATION_METHOD_HEADER_OAUTH;
}
/**
* Returns api version string if is set else retrun empty string
*
* @return string
*/
protected function getApiVersionString()
{
return !(empty($this->apiVersion)) ? "/".$this->apiVersion : "" ;
}
/**
* Returns delimiter to scopes in getAuthorizationUri
* For services that do not fully respect the Oauth's RFC,
* and use scopes with commas as delimiter
*
* @return string
*/
protected function getScopesDelimiter()
{
return ' ';
}
}