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<?php
namespace Laravel\Socialite\Two;
use GuzzleHttp\Client;
use GuzzleHttp\RequestOptions;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Laravel\Socialite\Contracts\Provider as ProviderContract;
abstract class AbstractProvider implements ProviderContract
{
/**
* The HTTP request instance.
*
* @var \Illuminate\Http\Request
*/
protected $request;
/**
* The HTTP Client instance.
*
* @var \GuzzleHttp\Client
*/
protected $httpClient;
/**
* The client ID.
*
* @var string
*/
protected $clientId;
/**
* The client secret.
*
* @var string
*/
protected $clientSecret;
/**
* The redirect URL.
*
* @var string
*/
protected $redirectUrl;
/**
* The custom parameters to be sent with the request.
*
* @var array
*/
protected $parameters = [];
/**
* The scopes being requested.
*
* @var array
*/
protected $scopes = [];
/**
* The separating character for the requested scopes.
*
* @var string
*/
protected $scopeSeparator = ',';
/**
* The type of the encoding in the query.
*
* @var int Can be either PHP_QUERY_RFC3986 or PHP_QUERY_RFC1738.
*/
protected $encodingType = PHP_QUERY_RFC1738;
/**
* Indicates if the session state should be utilized.
*
* @var bool
*/
protected $stateless = false;
/**
* Indicates if PKCE should be used.
*
* @var bool
*/
protected $usesPKCE = false;
/**
* The custom Guzzle configuration options.
*
* @var array
*/
protected $guzzle = [];
/**
* The cached user instance.
*
* @var \Laravel\Socialite\Two\User|null
*/
protected $user;
/**
* Create a new provider instance.
*
* @param \Illuminate\Http\Request $request
* @param string $clientId
* @param string $clientSecret
* @param string $redirectUrl
* @param array $guzzle
* @return void
*/
public function __construct(Request $request, $clientId, $clientSecret, $redirectUrl, $guzzle = [])
{
$this->guzzle = $guzzle;
$this->request = $request;
$this->clientId = $clientId;
$this->redirectUrl = $redirectUrl;
$this->clientSecret = $clientSecret;
}
/**
* Get the authentication URL for the provider.
*
* @param string $state
* @return string
*/
abstract protected function getAuthUrl($state);
/**
* Get the token URL for the provider.
*
* @return string
*/
abstract protected function getTokenUrl();
/**
* Get the raw user for the given access token.
*
* @param string $token
* @return array
*/
abstract protected function getUserByToken($token);
/**
* Map the raw user array to a Socialite User instance.
*
* @param array $user
* @return \Laravel\Socialite\Two\User
*/
abstract protected function mapUserToObject(array $user);
/**
* Redirect the user of the application to the provider's authentication screen.
*
* @return \Illuminate\Http\RedirectResponse
*/
public function redirect()
{
$state = null;
if ($this->usesState()) {
$this->request->session()->put('state', $state = $this->getState());
}
if ($this->usesPKCE()) {
$this->request->session()->put('code_verifier', $this->getCodeVerifier());
}
return new RedirectResponse($this->getAuthUrl($state));
}
/**
* Build the authentication URL for the provider from the given base URL.
*
* @param string $url
* @param string $state
* @return string
*/
protected function buildAuthUrlFromBase($url, $state)
{
return $url.'?'.http_build_query($this->getCodeFields($state), '', '&', $this->encodingType);
}
/**
* Get the GET parameters for the code request.
*
* @param string|null $state
* @return array
*/
protected function getCodeFields($state = null)
{
$fields = [
'client_id' => $this->clientId,
'redirect_uri' => $this->redirectUrl,
'scope' => $this->formatScopes($this->getScopes(), $this->scopeSeparator),
'response_type' => 'code',
];
if ($this->usesState()) {
$fields['state'] = $state;
}
if ($this->usesPKCE()) {
$fields['code_challenge'] = $this->getCodeChallenge();
$fields['code_challenge_method'] = $this->getCodeChallengeMethod();
}
return array_merge($fields, $this->parameters);
}
/**
* Format the given scopes.
*
* @param array $scopes
* @param string $scopeSeparator
* @return string
*/
protected function formatScopes(array $scopes, $scopeSeparator)
{
return implode($scopeSeparator, $scopes);
}
/**
* {@inheritdoc}
*/
public function user()
{
if ($this->user) {
return $this->user;
}
if ($this->hasInvalidState()) {
throw new InvalidStateException;
}
$response = $this->getAccessTokenResponse($this->getCode());
$this->user = $this->mapUserToObject($this->getUserByToken(
$token = Arr::get($response, 'access_token')
));
return $this->user->setToken($token)
->setRefreshToken(Arr::get($response, 'refresh_token'))
->setExpiresIn(Arr::get($response, 'expires_in'))
->setApprovedScopes(explode($this->scopeSeparator, Arr::get($response, 'scope', '')));
}
/**
* Get a Social User instance from a known access token.
*
* @param string $token
* @return \Laravel\Socialite\Two\User
*/
public function userFromToken($token)
{
$user = $this->mapUserToObject($this->getUserByToken($token));
return $user->setToken($token);
}
/**
* Determine if the current request / session has a mismatching "state".
*
* @return bool
*/
protected function hasInvalidState()
{
if ($this->isStateless()) {
return false;
}
$state = $this->request->session()->pull('state');
return empty($state) || $this->request->input('state') !== $state;
}
/**
* Get the access token response for the given code.
*
* @param string $code
* @return array
*/
public function getAccessTokenResponse($code)
{
$response = $this->getHttpClient()->post($this->getTokenUrl(), [
RequestOptions::HEADERS => $this->getTokenHeaders($code),
RequestOptions::FORM_PARAMS => $this->getTokenFields($code),
]);
return json_decode($response->getBody(), true);
}
/**
* Get the headers for the access token request.
*
* @param string $code
* @return array
*/
protected function getTokenHeaders($code)
{
return ['Accept' => 'application/json'];
}
/**
* Get the POST fields for the token request.
*
* @param string $code
* @return array
*/
protected function getTokenFields($code)
{
$fields = [
'grant_type' => 'authorization_code',
'client_id' => $this->clientId,
'client_secret' => $this->clientSecret,
'code' => $code,
'redirect_uri' => $this->redirectUrl,
];
if ($this->usesPKCE()) {
$fields['code_verifier'] = $this->request->session()->pull('code_verifier');
}
return $fields;
}
/**
* Get the code from the request.
*
* @return string
*/
protected function getCode()
{
return $this->request->input('code');
}
/**
* Merge the scopes of the requested access.
*
* @param array|string $scopes
* @return $this
*/
public function scopes($scopes)
{
$this->scopes = array_unique(array_merge($this->scopes, (array) $scopes));
return $this;
}
/**
* Set the scopes of the requested access.
*
* @param array|string $scopes
* @return $this
*/
public function setScopes($scopes)
{
$this->scopes = array_unique((array) $scopes);
return $this;
}
/**
* Get the current scopes.
*
* @return array
*/
public function getScopes()
{
return $this->scopes;
}
/**
* Set the redirect URL.
*
* @param string $url
* @return $this
*/
public function redirectUrl($url)
{
$this->redirectUrl = $url;
return $this;
}
/**
* Get a instance of the Guzzle HTTP client.
*
* @return \GuzzleHttp\Client
*/
protected function getHttpClient()
{
if (is_null($this->httpClient)) {
$this->httpClient = new Client($this->guzzle);
}
return $this->httpClient;
}
/**
* Set the Guzzle HTTP client instance.
*
* @param \GuzzleHttp\Client $client
* @return $this
*/
public function setHttpClient(Client $client)
{
$this->httpClient = $client;
return $this;
}
/**
* Set the request instance.
*
* @param \Illuminate\Http\Request $request
* @return $this
*/
public function setRequest(Request $request)
{
$this->request = $request;
return $this;
}
/**
* Determine if the provider is operating with state.
*
* @return bool
*/
protected function usesState()
{
return ! $this->stateless;
}
/**
* Determine if the provider is operating as stateless.
*
* @return bool
*/
protected function isStateless()
{
return $this->stateless;
}
/**
* Indicates that the provider should operate as stateless.
*
* @return $this
*/
public function stateless()
{
$this->stateless = true;
return $this;
}
/**
* Get the string used for session state.
*
* @return string
*/
protected function getState()
{
return Str::random(40);
}
/**
* Determine if the provider uses PKCE.
*
* @return bool
*/
protected function usesPKCE()
{
return $this->usesPKCE;
}
/**
* Enables PKCE for the provider.
*
* @return $this
*/
public function enablePKCE()
{
$this->usesPKCE = true;
return $this;
}
/**
* Generates a random string of the right length for the PKCE code verifier.
*
* @return string
*/
protected function getCodeVerifier()
{
return Str::random(96);
}
/**
* Generates the PKCE code challenge based on the PKCE code verifier in the session.
*
* @return string
*/
protected function getCodeChallenge()
{
$hashed = hash('sha256', $this->request->session()->get('code_verifier'), true);
return rtrim(strtr(base64_encode($hashed), '+/', '-_'), '=');
}
/**
* Returns the hash method used to calculate the PKCE code challenge.
*
* @return string
*/
protected function getCodeChallengeMethod()
{
return 'S256';
}
/**
* Set the custom parameters of the request.
*
* @param array $parameters
* @return $this
*/
public function with(array $parameters)
{
$this->parameters = $parameters;
return $this;
}
}
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