Update website

vendor/league/oauth2-client/src/Provider/AbstractProvider.php

@@ -0,0 +1,941 @@
+<?php
+/**
+ * This file is part of the league/oauth2-client library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @link http://thephpleague.com/oauth2-client/ Documentation
+ * @link https://packagist.org/packages/league/oauth2-client Packagist
+ * @link https://github.com/thephpleague/oauth2-client GitHub
+ */
+
+namespace League\OAuth2\Client\Provider;
+
+use GuzzleHttp\Client as HttpClient;
+use GuzzleHttp\ClientInterface as HttpClientInterface;
+use GuzzleHttp\Exception\BadResponseException;
+use InvalidArgumentException;
+use League\OAuth2\Client\Grant\AbstractGrant;
+use League\OAuth2\Client\Grant\GrantFactory;
+use League\OAuth2\Client\OptionProvider\OptionProviderInterface;
+use League\OAuth2\Client\OptionProvider\PostAuthOptionProvider;
+use League\OAuth2\Client\Provider\Exception\IdentityProviderException;
+use League\OAuth2\Client\Token\AccessToken;
+use League\OAuth2\Client\Token\AccessTokenInterface;
+use League\OAuth2\Client\Tool\ArrayAccessorTrait;
+use League\OAuth2\Client\Tool\GuardedPropertyTrait;
+use League\OAuth2\Client\Tool\QueryBuilderTrait;
+use League\OAuth2\Client\Tool\RequestFactory;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use UnexpectedValueException;
+
+/**
+ * Represents a service provider (authorization server).
+ *
+ * @link http://tools.ietf.org/html/rfc6749#section-1.1 Roles (RFC 6749, §1.1)
+ */
+abstract class AbstractProvider
+{
+    use ArrayAccessorTrait;
+    use GuardedPropertyTrait;
+    use QueryBuilderTrait;
+
+    /**
+     * @var string|null Key used in a token response to identify the resource owner.
+     */
+    const ACCESS_TOKEN_RESOURCE_OWNER_ID = null;
+
+    /**
+     * @var string HTTP method used to fetch access tokens.
+     */
+    const METHOD_GET = 'GET';
+
+    /**
+     * @var string HTTP method used to fetch access tokens.
+     */
+    const METHOD_POST = 'POST';
+
+    /**
+     * @var string PKCE method used to fetch authorization token.
+     * The PKCE code challenge will be hashed with sha256 (recommended).
+     */
+    const PKCE_METHOD_S256 = 'S256';
+
+    /**
+     * @var string PKCE method used to fetch authorization token.
+     * The PKCE code challenge will be sent as plain text, this is NOT recommended.
+     * Only use `plain` if no other option is possible.
+     */
+    const PKCE_METHOD_PLAIN = 'plain';
+
+    /**
+     * @var string
+     */
+    protected $clientId;
+
+    /**
+     * @var string
+     */
+    protected $clientSecret;
+
+    /**
+     * @var string
+     */
+    protected $redirectUri;
+
+    /**
+     * @var string
+     */
+    protected $state;
+
+    /**
+     * @var string|null
+     */
+    protected $pkceCode = null;
+
+    /**
+     * @var GrantFactory
+     */
+    protected $grantFactory;
+
+    /**
+     * @var RequestFactory
+     */
+    protected $requestFactory;
+
+    /**
+     * @var HttpClientInterface
+     */
+    protected $httpClient;
+
+    /**
+     * @var OptionProviderInterface
+     */
+    protected $optionProvider;
+
+    /**
+     * Constructs an OAuth 2.0 service provider.
+     *
+     * @param array $options An array of options to set on this provider.
+     *     Options include `clientId`, `clientSecret`, `redirectUri`, and `state`.
+     *     Individual providers may introduce more options, as needed.
+     * @param array $collaborators An array of collaborators that may be used to
+     *     override this provider's default behavior. Collaborators include
+     *     `grantFactory`, `requestFactory`, and `httpClient`.
+     *     Individual providers may introduce more collaborators, as needed.
+     */
+    public function __construct(array $options = [], array $collaborators = [])
+    {
+        // We'll let the GuardedPropertyTrait handle mass assignment of incoming
+        // options, skipping any blacklisted properties defined in the provider
+        $this->fillProperties($options);
+
+        if (empty($collaborators['grantFactory'])) {
+            $collaborators['grantFactory'] = new GrantFactory();
+        }
+        $this->setGrantFactory($collaborators['grantFactory']);
+
+        if (empty($collaborators['requestFactory'])) {
+            $collaborators['requestFactory'] = new RequestFactory();
+        }
+        $this->setRequestFactory($collaborators['requestFactory']);
+
+        if (empty($collaborators['httpClient'])) {
+            $client_options = $this->getAllowedClientOptions($options);
+
+            $collaborators['httpClient'] = new HttpClient(
+                array_intersect_key($options, array_flip($client_options))
+            );
+        }
+        $this->setHttpClient($collaborators['httpClient']);
+
+        if (empty($collaborators['optionProvider'])) {
+            $collaborators['optionProvider'] = new PostAuthOptionProvider();
+        }
+        $this->setOptionProvider($collaborators['optionProvider']);
+    }
+
+    /**
+     * Returns the list of options that can be passed to the HttpClient
+     *
+     * @param array $options An array of options to set on this provider.
+     *     Options include `clientId`, `clientSecret`, `redirectUri`, and `state`.
+     *     Individual providers may introduce more options, as needed.
+     * @return array The options to pass to the HttpClient constructor
+     */
+    protected function getAllowedClientOptions(array $options)
+    {
+        $client_options = ['timeout', 'proxy'];
+
+        // Only allow turning off ssl verification if it's for a proxy
+        if (!empty($options['proxy'])) {
+            $client_options[] = 'verify';
+        }
+
+        return $client_options;
+    }
+
+    /**
+     * Sets the grant factory instance.
+     *
+     * @param  GrantFactory $factory
+     * @return self
+     */
+    public function setGrantFactory(GrantFactory $factory)
+    {
+        $this->grantFactory = $factory;
+
+        return $this;
+    }
+
+    /**
+     * Returns the current grant factory instance.
+     *
+     * @return GrantFactory
+     */
+    public function getGrantFactory()
+    {
+        return $this->grantFactory;
+    }
+
+    /**
+     * Sets the request factory instance.
+     *
+     * @param  RequestFactory $factory
+     * @return self
+     */
+    public function setRequestFactory(RequestFactory $factory)
+    {
+        $this->requestFactory = $factory;
+
+        return $this;
+    }
+
+    /**
+     * Returns the request factory instance.
+     *
+     * @return RequestFactory
+     */
+    public function getRequestFactory()
+    {
+        return $this->requestFactory;
+    }
+
+    /**
+     * Sets the HTTP client instance.
+     *
+     * @param  HttpClientInterface $client
+     * @return self
+     */
+    public function setHttpClient(HttpClientInterface $client)
+    {
+        $this->httpClient = $client;
+
+        return $this;
+    }
+
+    /**
+     * Returns the HTTP client instance.
+     *
+     * @return HttpClientInterface
+     */
+    public function getHttpClient()
+    {
+        return $this->httpClient;
+    }
+
+    /**
+     * Sets the option provider instance.
+     *
+     * @param  OptionProviderInterface $provider
+     * @return self
+     */
+    public function setOptionProvider(OptionProviderInterface $provider)
+    {
+        $this->optionProvider = $provider;
+
+        return $this;
+    }
+
+    /**
+     * Returns the option provider instance.
+     *
+     * @return OptionProviderInterface
+     */
+    public function getOptionProvider()
+    {
+        return $this->optionProvider;
+    }
+
+    /**
+     * Returns the current value of the state parameter.
+     *
+     * This can be accessed by the redirect handler during authorization.
+     *
+     * @return string
+     */
+    public function getState()
+    {
+        return $this->state;
+    }
+
+    /**
+     * Set the value of the pkceCode parameter.
+     *
+     * When using PKCE this should be set before requesting an access token.
+     *
+     * @param string $pkceCode
+     * @return self
+     */
+    public function setPkceCode($pkceCode)
+    {
+        $this->pkceCode = $pkceCode;
+        return $this;
+    }
+
+    /**
+     * Returns the current value of the pkceCode parameter.
+     *
+     * This can be accessed by the redirect handler during authorization.
+     *
+     * @return string|null
+     */
+    public function getPkceCode()
+    {
+        return $this->pkceCode;
+    }
+
+    /**
+     * Returns the base URL for authorizing a client.
+     *
+     * Eg. https://oauth.service.com/authorize
+     *
+     * @return string
+     */
+    abstract public function getBaseAuthorizationUrl();
+
+    /**
+     * Returns the base URL for requesting an access token.
+     *
+     * Eg. https://oauth.service.com/token
+     *
+     * @param array $params
+     * @return string
+     */
+    abstract public function getBaseAccessTokenUrl(array $params);
+
+    /**
+     * Returns the URL for requesting the resource owner's details.
+     *
+     * @param AccessToken $token
+     * @return string
+     */
+    abstract public function getResourceOwnerDetailsUrl(AccessToken $token);
+
+    /**
+     * Returns a new random string to use as the state parameter in an
+     * authorization flow.
+     *
+     * @param  int $length Length of the random string to be generated.
+     * @return string
+     */
+    protected function getRandomState($length = 32)
+    {
+        // Converting bytes to hex will always double length. Hence, we can reduce
+        // the amount of bytes by half to produce the correct length.
+        return bin2hex(random_bytes($length / 2));
+    }
+
+    /**
+     * Returns a new random string to use as PKCE code_verifier and
+     * hashed as code_challenge parameters in an authorization flow.
+     * Must be between 43 and 128 characters long.
+     *
+     * @param  int $length Length of the random string to be generated.
+     * @return string
+     */
+    protected function getRandomPkceCode($length = 64)
+    {
+        return substr(
+            strtr(
+                base64_encode(random_bytes($length)),
+                '+/',
+                '-_'
+            ),
+            0,
+            $length
+        );
+    }
+
+    /**
+     * Returns the default scopes used by this provider.
+     *
+     * This should only be the scopes that are required to request the details
+     * of the resource owner, rather than all the available scopes.
+     *
+     * @return array
+     */
+    abstract protected function getDefaultScopes();
+
+    /**
+     * Returns the string that should be used to separate scopes when building
+     * the URL for requesting an access token.
+     *
+     * @return string Scope separator, defaults to ','
+     */
+    protected function getScopeSeparator()
+    {
+        return ',';
+    }
+
+    /**
+     * @return string|null
+     */
+    protected function getPkceMethod()
+    {
+        return null;
+    }
+
+    /**
+     * Returns authorization parameters based on provided options.
+     *
+     * @param  array $options
+     * @return array Authorization parameters
+     */
+    protected function getAuthorizationParameters(array $options)
+    {
+        if (empty($options['state'])) {
+            $options['state'] = $this->getRandomState();
+        }
+
+        if (empty($options['scope'])) {
+            $options['scope'] = $this->getDefaultScopes();
+        }
+
+        $options += [
+            'response_type'   => 'code',
+            'approval_prompt' => 'auto'
+        ];
+
+        if (is_array($options['scope'])) {
+            $separator = $this->getScopeSeparator();
+            $options['scope'] = implode($separator, $options['scope']);
+        }
+
+        // Store the state as it may need to be accessed later on.
+        $this->state = $options['state'];
+
+        $pkceMethod = $this->getPkceMethod();
+        if (!empty($pkceMethod)) {
+            $this->pkceCode = $this->getRandomPkceCode();
+            if ($pkceMethod === static::PKCE_METHOD_S256) {
+                $options['code_challenge'] = trim(
+                    strtr(
+                        base64_encode(hash('sha256', $this->pkceCode, true)),
+                        '+/',
+                        '-_'
+                    ),
+                    '='
+                );
+            } elseif ($pkceMethod === static::PKCE_METHOD_PLAIN) {
+                $options['code_challenge'] = $this->pkceCode;
+            } else {
+                throw new InvalidArgumentException('Unknown PKCE method "' . $pkceMethod . '".');
+            }
+            $options['code_challenge_method'] = $pkceMethod;
+        }
+
+        // Business code layer might set a different redirect_uri parameter
+        // depending on the context, leave it as-is
+        if (!isset($options['redirect_uri'])) {
+            $options['redirect_uri'] = $this->redirectUri;
+        }
+
+        $options['client_id'] = $this->clientId;
+
+        return $options;
+    }
+
+    /**
+     * Builds the authorization URL's query string.
+     *
+     * @param  array $params Query parameters
+     * @return string Query string
+     */
+    protected function getAuthorizationQuery(array $params)
+    {
+        return $this->buildQueryString($params);
+    }
+
+    /**
+     * Builds the authorization URL.
+     *
+     * @param  array $options
+     * @return string Authorization URL
+     */
+    public function getAuthorizationUrl(array $options = [])
+    {
+        $base   = $this->getBaseAuthorizationUrl();
+        $params = $this->getAuthorizationParameters($options);
+        $query  = $this->getAuthorizationQuery($params);
+
+        return $this->appendQuery($base, $query);
+    }
+
+    /**
+     * Redirects the client for authorization.
+     *
+     * @param  array $options
+     * @param  callable|null $redirectHandler
+     * @return mixed
+     */
+    public function authorize(
+        array $options = [],
+        callable $redirectHandler = null
+    ) {
+        $url = $this->getAuthorizationUrl($options);
+        if ($redirectHandler) {
+            return $redirectHandler($url, $this);
+        }
+
+        // @codeCoverageIgnoreStart
+        header('Location: ' . $url);
+        exit;
+        // @codeCoverageIgnoreEnd
+    }
+
+    /**
+     * Appends a query string to a URL.
+     *
+     * @param  string $url The URL to append the query to
+     * @param  string $query The HTTP query string
+     * @return string The resulting URL
+     */
+    protected function appendQuery($url, $query)
+    {
+        $query = trim($query, '?&');
+
+        if ($query) {
+            $glue = strstr($url, '?') === false ? '?' : '&';
+            return $url . $glue . $query;
+        }
+
+        return $url;
+    }
+
+    /**
+     * Returns the method to use when requesting an access token.
+     *
+     * @return string HTTP method
+     */
+    protected function getAccessTokenMethod()
+    {
+        return self::METHOD_POST;
+    }
+
+    /**
+     * Returns the key used in the access token response to identify the resource owner.
+     *
+     * @return string|null Resource owner identifier key
+     */
+    protected function getAccessTokenResourceOwnerId()
+    {
+        return static::ACCESS_TOKEN_RESOURCE_OWNER_ID;
+    }
+
+    /**
+     * Builds the access token URL's query string.
+     *
+     * @param  array $params Query parameters
+     * @return string Query string
+     */
+    protected function getAccessTokenQuery(array $params)
+    {
+        return $this->buildQueryString($params);
+    }
+
+    /**
+     * Checks that a provided grant is valid, or attempts to produce one if the
+     * provided grant is a string.
+     *
+     * @param  AbstractGrant|string $grant
+     * @return AbstractGrant
+     */
+    protected function verifyGrant($grant)
+    {
+        if (is_string($grant)) {
+            return $this->grantFactory->getGrant($grant);
+        }
+
+        $this->grantFactory->checkGrant($grant);
+        return $grant;
+    }
+
+    /**
+     * Returns the full URL to use when requesting an access token.
+     *
+     * @param array $params Query parameters
+     * @return string
+     */
+    protected function getAccessTokenUrl(array $params)
+    {
+        $url = $this->getBaseAccessTokenUrl($params);
+
+        if ($this->getAccessTokenMethod() === self::METHOD_GET) {
+            $query = $this->getAccessTokenQuery($params);
+            return $this->appendQuery($url, $query);
+        }
+
+        return $url;
+    }
+
+    /**
+     * Returns a prepared request for requesting an access token.
+     *
+     * @param array $params Query string parameters
+     * @return RequestInterface
+     */
+    protected function getAccessTokenRequest(array $params)
+    {
+        $method  = $this->getAccessTokenMethod();
+        $url     = $this->getAccessTokenUrl($params);
+        $options = $this->optionProvider->getAccessTokenOptions($this->getAccessTokenMethod(), $params);
+
+        return $this->getRequest($method, $url, $options);
+    }
+
+    /**
+     * Requests an access token using a specified grant and option set.
+     *
+     * @param  mixed                $grant
+     * @param  array<string, mixed> $options
+     * @throws IdentityProviderException
+     * @return AccessTokenInterface
+     */
+    public function getAccessToken($grant, array $options = [])
+    {
+        $grant = $this->verifyGrant($grant);
+
+        $params = [
+            'client_id'     => $this->clientId,
+            'client_secret' => $this->clientSecret,
+            'redirect_uri'  => $this->redirectUri,
+        ];
+
+        if (!empty($this->pkceCode)) {
+            $params['code_verifier'] = $this->pkceCode;
+        }
+
+        $params   = $grant->prepareRequestParameters($params, $options);
+        $request  = $this->getAccessTokenRequest($params);
+        $response = $this->getParsedResponse($request);
+        if (false === is_array($response)) {
+            throw new UnexpectedValueException(
+                'Invalid response received from Authorization Server. Expected JSON.'
+            );
+        }
+        $prepared = $this->prepareAccessTokenResponse($response);
+        $token    = $this->createAccessToken($prepared, $grant);
+
+        return $token;
+    }
+
+    /**
+     * Returns a PSR-7 request instance that is not authenticated.
+     *
+     * @param  string $method
+     * @param  string $url
+     * @param  array $options
+     * @return RequestInterface
+     */
+    public function getRequest($method, $url, array $options = [])
+    {
+        return $this->createRequest($method, $url, null, $options);
+    }
+
+    /**
+     * Returns an authenticated PSR-7 request instance.
+     *
+     * @param  string $method
+     * @param  string $url
+     * @param  AccessTokenInterface|string|null $token
+     * @param  array $options Any of "headers", "body", and "protocolVersion".
+     * @return RequestInterface
+     */
+    public function getAuthenticatedRequest($method, $url, $token, array $options = [])
+    {
+        return $this->createRequest($method, $url, $token, $options);
+    }
+
+    /**
+     * Creates a PSR-7 request instance.
+     *
+     * @param  string $method
+     * @param  string $url
+     * @param  AccessTokenInterface|string|null $token
+     * @param  array $options
+     * @return RequestInterface
+     */
+    protected function createRequest($method, $url, $token, array $options)
+    {
+        $defaults = [
+            'headers' => $this->getHeaders($token),
+        ];
+
+        $options = array_merge_recursive($defaults, $options);
+        $factory = $this->getRequestFactory();
+
+        return $factory->getRequestWithOptions($method, $url, $options);
+    }
+
+    /**
+     * Sends a request instance and returns a response instance.
+     *
+     * WARNING: This method does not attempt to catch exceptions caused by HTTP
+     * errors! It is recommended to wrap this method in a try/catch block.
+     *
+     * @param  RequestInterface $request
+     * @return ResponseInterface
+     */
+    public function getResponse(RequestInterface $request)
+    {
+        return $this->getHttpClient()->send($request);
+    }
+
+    /**
+     * Sends a request and returns the parsed response.
+     *
+     * @param  RequestInterface $request
+     * @throws IdentityProviderException
+     * @return mixed
+     */
+    public function getParsedResponse(RequestInterface $request)
+    {
+        try {
+            $response = $this->getResponse($request);
+        } catch (BadResponseException $e) {
+            $response = $e->getResponse();
+        }
+
+        $parsed = $this->parseResponse($response);
+
+        $this->checkResponse($response, $parsed);
+
+        return $parsed;
+    }
+
+    /**
+     * Attempts to parse a JSON response.
+     *
+     * @param  string $content JSON content from response body
+     * @return array Parsed JSON data
+     * @throws UnexpectedValueException if the content could not be parsed
+     */
+    protected function parseJson($content)
+    {
+        $content = json_decode($content, true);
+
+        if (json_last_error() !== JSON_ERROR_NONE) {
+            throw new UnexpectedValueException(sprintf(
+                "Failed to parse JSON response: %s",
+                json_last_error_msg()
+            ));
+        }
+
+        return $content;
+    }
+
+    /**
+     * Returns the content type header of a response.
+     *
+     * @param  ResponseInterface $response
+     * @return string Semi-colon separated join of content-type headers.
+     */
+    protected function getContentType(ResponseInterface $response)
+    {
+        return join(';', (array) $response->getHeader('content-type'));
+    }
+
+    /**
+     * Parses the response according to its content-type header.
+     *
+     * @throws UnexpectedValueException
+     * @param  ResponseInterface $response
+     * @return array
+     */
+    protected function parseResponse(ResponseInterface $response)
+    {
+        $content = (string) $response->getBody();
+        $type = $this->getContentType($response);
+
+        if (strpos($type, 'urlencoded') !== false) {
+            parse_str($content, $parsed);
+            return $parsed;
+        }
+
+        // Attempt to parse the string as JSON regardless of content type,
+        // since some providers use non-standard content types. Only throw an
+        // exception if the JSON could not be parsed when it was expected to.
+        try {
+            return $this->parseJson($content);
+        } catch (UnexpectedValueException $e) {
+            if (strpos($type, 'json') !== false) {
+                throw $e;
+            }
+
+            if ($response->getStatusCode() == 500) {
+                throw new UnexpectedValueException(
+                    'An OAuth server error was encountered that did not contain a JSON body',
+                    0,
+                    $e
+                );
+            }
+
+            return $content;
+        }
+    }
+
+    /**
+     * Checks a provider response for errors.
+     *
+     * @throws IdentityProviderException
+     * @param  ResponseInterface $response
+     * @param  array|string $data Parsed response data
+     * @return void
+     */
+    abstract protected function checkResponse(ResponseInterface $response, $data);
+
+    /**
+     * Prepares an parsed access token response for a grant.
+     *
+     * Custom mapping of expiration, etc should be done here. Always call the
+     * parent method when overloading this method.
+     *
+     * @param  mixed $result
+     * @return array
+     */
+    protected function prepareAccessTokenResponse(array $result)
+    {
+        if ($this->getAccessTokenResourceOwnerId() !== null) {
+            $result['resource_owner_id'] = $this->getValueByKey(
+                $result,
+                $this->getAccessTokenResourceOwnerId()
+            );
+        }
+        return $result;
+    }
+
+    /**
+     * Creates an access token from a response.
+     *
+     * The grant that was used to fetch the response can be used to provide
+     * additional context.
+     *
+     * @param  array $response
+     * @param  AbstractGrant $grant
+     * @return AccessTokenInterface
+     */
+    protected function createAccessToken(array $response, AbstractGrant $grant)
+    {
+        return new AccessToken($response);
+    }
+
+    /**
+     * Generates a resource owner object from a successful resource owner
+     * details request.
+     *
+     * @param  array $response
+     * @param  AccessToken $token
+     * @return ResourceOwnerInterface
+     */
+    abstract protected function createResourceOwner(array $response, AccessToken $token);
+
+    /**
+     * Requests and returns the resource owner of given access token.
+     *
+     * @param  AccessToken $token
+     * @return ResourceOwnerInterface
+     */
+    public function getResourceOwner(AccessToken $token)
+    {
+        $response = $this->fetchResourceOwnerDetails($token);
+
+        return $this->createResourceOwner($response, $token);
+    }
+
+    /**
+     * Requests resource owner details.
+     *
+     * @param  AccessToken $token
+     * @return mixed
+     */
+    protected function fetchResourceOwnerDetails(AccessToken $token)
+    {
+        $url = $this->getResourceOwnerDetailsUrl($token);
+
+        $request = $this->getAuthenticatedRequest(self::METHOD_GET, $url, $token);
+
+        $response = $this->getParsedResponse($request);
+
+        if (false === is_array($response)) {
+            throw new UnexpectedValueException(
+                'Invalid response received from Authorization Server. Expected JSON.'
+            );
+        }
+
+        return $response;
+    }
+
+    /**
+     * Returns the default headers used by this provider.
+     *
+     * Typically this is used to set 'Accept' or 'Content-Type' headers.
+     *
+     * @return array
+     */
+    protected function getDefaultHeaders()
+    {
+        return [];
+    }
+
+    /**
+     * Returns the authorization headers used by this provider.
+     *
+     * Typically this is "Bearer" or "MAC". For more information see:
+     * http://tools.ietf.org/html/rfc6749#section-7.1
+     *
+     * No default is provided, providers must overload this method to activate
+     * authorization headers.
+     *
+     * @param  mixed|null $token Either a string or an access token instance
+     * @return array
+     */
+    protected function getAuthorizationHeaders($token = null)
+    {
+        return [];
+    }
+
+    /**
+     * Returns all headers used by this provider for a request.
+     *
+     * The request will be authenticated if an access token is provided.
+     *
+     * @param  mixed|null $token object or string
+     * @return array
+     */
+    public function getHeaders($token = null)
+    {
+        if ($token) {
+            return array_merge(
+                $this->getDefaultHeaders(),
+                $this->getAuthorizationHeaders($token)
+            );
+        }
+
+        return $this->getDefaultHeaders();
+    }
+}

vendor/league/oauth2-client/src/Provider/Exception/IdentityProviderException.php

@@ -0,0 +1,48 @@
+<?php
+/**
+ * This file is part of the league/oauth2-client library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @link http://thephpleague.com/oauth2-client/ Documentation
+ * @link https://packagist.org/packages/league/oauth2-client Packagist
+ * @link https://github.com/thephpleague/oauth2-client GitHub
+ */
+
+namespace League\OAuth2\Client\Provider\Exception;
+
+/**
+ * Exception thrown if the provider response contains errors.
+ */
+class IdentityProviderException extends \Exception
+{
+    /**
+     * @var mixed
+     */
+    protected $response;
+
+    /**
+     * @param string $message
+     * @param int $code
+     * @param mixed $response The response body
+     */
+    public function __construct($message, $code, $response)
+    {
+        $this->response = $response;
+
+        parent::__construct($message, $code);
+    }
+
+    /**
+     * Returns the exception's response body.
+     *
+     * @return mixed
+     */
+    public function getResponseBody()
+    {
+        return $this->response;
+    }
+}

vendor/league/oauth2-client/src/Provider/GenericProvider.php

@@ -0,0 +1,247 @@
+<?php
+/**
+ * This file is part of the league/oauth2-client library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @link http://thephpleague.com/oauth2-client/ Documentation
+ * @link https://packagist.org/packages/league/oauth2-client Packagist
+ * @link https://github.com/thephpleague/oauth2-client GitHub
+ */
+
+namespace League\OAuth2\Client\Provider;
+
+use InvalidArgumentException;
+use League\OAuth2\Client\Provider\Exception\IdentityProviderException;
+use League\OAuth2\Client\Token\AccessToken;
+use League\OAuth2\Client\Tool\BearerAuthorizationTrait;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Represents a generic service provider that may be used to interact with any
+ * OAuth 2.0 service provider, using Bearer token authentication.
+ */
+class GenericProvider extends AbstractProvider
+{
+    use BearerAuthorizationTrait;
+
+    /**
+     * @var string
+     */
+    private $urlAuthorize;
+
+    /**
+     * @var string
+     */
+    private $urlAccessToken;
+
+    /**
+     * @var string
+     */
+    private $urlResourceOwnerDetails;
+
+    /**
+     * @var string
+     */
+    private $accessTokenMethod;
+
+    /**
+     * @var string
+     */
+    private $accessTokenResourceOwnerId;
+
+    /**
+     * @var array|null
+     */
+    private $scopes = null;
+
+    /**
+     * @var string
+     */
+    private $scopeSeparator;
+
+    /**
+     * @var string
+     */
+    private $responseError = 'error';
+
+    /**
+     * @var string
+     */
+    private $responseCode;
+
+    /**
+     * @var string
+     */
+    private $responseResourceOwnerId = 'id';
+
+    /**
+     * @var string|null
+     */
+    private $pkceMethod = null;
+
+    /**
+     * @param array $options
+     * @param array $collaborators
+     */
+    public function __construct(array $options = [], array $collaborators = [])
+    {
+        $this->assertRequiredOptions($options);
+
+        $possible   = $this->getConfigurableOptions();
+        $configured = array_intersect_key($options, array_flip($possible));
+
+        foreach ($configured as $key => $value) {
+            $this->$key = $value;
+        }
+
+        // Remove all options that are only used locally
+        $options = array_diff_key($options, $configured);
+
+        parent::__construct($options, $collaborators);
+    }
+
+    /**
+     * Returns all options that can be configured.
+     *
+     * @return array
+     */
+    protected function getConfigurableOptions()
+    {
+        return array_merge($this->getRequiredOptions(), [
+            'accessTokenMethod',
+            'accessTokenResourceOwnerId',
+            'scopeSeparator',
+            'responseError',
+            'responseCode',
+            'responseResourceOwnerId',
+            'scopes',
+            'pkceMethod',
+        ]);
+    }
+
+    /**
+     * Returns all options that are required.
+     *
+     * @return array
+     */
+    protected function getRequiredOptions()
+    {
+        return [
+            'urlAuthorize',
+            'urlAccessToken',
+            'urlResourceOwnerDetails',
+        ];
+    }
+
+    /**
+     * Verifies that all required options have been passed.
+     *
+     * @param  array $options
+     * @return void
+     * @throws InvalidArgumentException
+     */
+    private function assertRequiredOptions(array $options)
+    {
+        $missing = array_diff_key(array_flip($this->getRequiredOptions()), $options);
+
+        if (!empty($missing)) {
+            throw new InvalidArgumentException(
+                'Required options not defined: ' . implode(', ', array_keys($missing))
+            );
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getBaseAuthorizationUrl()
+    {
+        return $this->urlAuthorize;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getBaseAccessTokenUrl(array $params)
+    {
+        return $this->urlAccessToken;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getResourceOwnerDetailsUrl(AccessToken $token)
+    {
+        return $this->urlResourceOwnerDetails;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getDefaultScopes()
+    {
+        return $this->scopes;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function getAccessTokenMethod()
+    {
+        return $this->accessTokenMethod ?: parent::getAccessTokenMethod();
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function getAccessTokenResourceOwnerId()
+    {
+        return $this->accessTokenResourceOwnerId ?: parent::getAccessTokenResourceOwnerId();
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function getScopeSeparator()
+    {
+        return $this->scopeSeparator ?: parent::getScopeSeparator();
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function getPkceMethod()
+    {
+        return $this->pkceMethod ?: parent::getPkceMethod();
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function checkResponse(ResponseInterface $response, $data)
+    {
+        if (!empty($data[$this->responseError])) {
+            $error = $data[$this->responseError];
+            if (!is_string($error)) {
+                $error = var_export($error, true);
+            }
+            $code  = $this->responseCode && !empty($data[$this->responseCode])? $data[$this->responseCode] : 0;
+            if (!is_int($code)) {
+                $code = intval($code);
+            }
+            throw new IdentityProviderException($error, $code, $data);
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function createResourceOwner(array $response, AccessToken $token)
+    {
+        return new GenericResourceOwner($response, $this->responseResourceOwnerId);
+    }
+}

vendor/league/oauth2-client/src/Provider/GenericResourceOwner.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * This file is part of the league/oauth2-client library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @link http://thephpleague.com/oauth2-client/ Documentation
+ * @link https://packagist.org/packages/league/oauth2-client Packagist
+ * @link https://github.com/thephpleague/oauth2-client GitHub
+ */
+
+namespace League\OAuth2\Client\Provider;
+
+/**
+ * Represents a generic resource owner for use with the GenericProvider.
+ */
+class GenericResourceOwner implements ResourceOwnerInterface
+{
+    /**
+     * @var array
+     */
+    protected $response;
+
+    /**
+     * @var string
+     */
+    protected $resourceOwnerId;
+
+    /**
+     * @param array $response
+     * @param string $resourceOwnerId
+     */
+    public function __construct(array $response, $resourceOwnerId)
+    {
+        $this->response = $response;
+        $this->resourceOwnerId = $resourceOwnerId;
+    }
+
+    /**
+     * Returns the identifier of the authorized resource owner.
+     *
+     * @return mixed
+     */
+    public function getId()
+    {
+        return $this->response[$this->resourceOwnerId];
+    }
+
+    /**
+     * Returns the raw resource owner response.
+     *
+     * @return array
+     */
+    public function toArray()
+    {
+        return $this->response;
+    }
+}

vendor/league/oauth2-client/src/Provider/ResourceOwnerInterface.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ * This file is part of the league/oauth2-client library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Alex Bilbie <hello@alexbilbie.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ * @link http://thephpleague.com/oauth2-client/ Documentation
+ * @link https://packagist.org/packages/league/oauth2-client Packagist
+ * @link https://github.com/thephpleague/oauth2-client GitHub
+ */
+
+namespace League\OAuth2\Client\Provider;
+
+/**
+ * Classes implementing `ResourceOwnerInterface` may be used to represent
+ * the resource owner authenticated with a service provider.
+ */
+interface ResourceOwnerInterface
+{
+    /**
+     * Returns the identifier of the authorized resource owner.
+     *
+     * @return mixed
+     */
+    public function getId();
+
+    /**
+     * Return all of the owner details available as an array.
+     *
+     * @return array
+     */
+    public function toArray();
+}