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<?php
/**
 * OAuth 2.0 Authorization Server
 *
 * @package     league/oauth2-server
 * @author      Alex Bilbie <hello@alexbilbie.com>
 * @copyright   Copyright (c) Alex Bilbie
 * @license     http://mit-license.org/
 * @link        https://github.com/thephpleague/oauth2-server
 */

namespace League\OAuth2\Server;

use League\OAuth2\Server\Grant\GrantTypeInterface;
use League\OAuth2\Server\TokenType\Bearer;

/**
 * OAuth 2.0 authorization server class
 */
class AuthorizationServer extends AbstractServer
{
    /**
     * The delimiter between scopes specified in the scope query string parameter
     * The OAuth 2 specification states it should be a space but most use a comma
     *
     * @var string
     */
    protected $scopeDelimiter = ' ';

/**
     * The TTL (time to live) of an access token in seconds (default: 3600)
     *
     * @var integer
     */
    protected $accessTokenTTL = 3600;

/**
     * The registered grant response types
     *
     * @var array
     */
    protected $responseTypes = [];

/**
     * The registered grant types
     *
     * @var array
     */
    protected $grantTypes = [];

/**
     * Require the "scope" parameter to be in checkAuthoriseParams()
     *
     * @var boolean
     */
    protected $requireScopeParam = false;

/**
     * Default scope(s) to be used if none is provided
     *
     * @var string|array
     */
    protected $defaultScope;

/**
     * Require the "state" parameter to be in checkAuthoriseParams()
     *
     * @var boolean
     */
    protected $requireStateParam = false;

/**
     * Create a new OAuth2 authorization server
     *
     * @return self
     */
    public function __construct()
    {
        // Set Bearer as the default token type
        $this->setTokenType(new Bearer());

parent::__construct();

return $this;
    }

/**
     * Enable support for a grant
     *
     * @param GrantTypeInterface $grantType  A grant class which conforms to Interface/GrantTypeInterface
     * @param null|string        $identifier An identifier for the grant (autodetected if not passed)
     *
     * @return self
     */
    public function addGrantType(GrantTypeInterface $grantType, $identifier = null)
    {
        if (is_null($identifier)) {
            $identifier = $grantType->getIdentifier();
        }

// Inject server into grant
        $grantType->setAuthorizationServer($this);

$this->grantTypes[$identifier] = $grantType;

if (!is_null($grantType->getResponseType())) {
            $this->responseTypes[] = $grantType->getResponseType();
        }

return $this;
    }

/**
     * Check if a grant type has been enabled
     *
     * @param string $identifier The grant type identifier
     *
     * @return boolean Returns "true" if enabled, "false" if not
     */
    public function hasGrantType($identifier)
    {
        return (array_key_exists($identifier, $this->grantTypes));
    }

/**
     * Returns response types
     *
     * @return array
     */
    public function getResponseTypes()
    {
        return $this->responseTypes;
    }

/**
     * Require the "scope" parameter in checkAuthoriseParams()
     *
     * @param boolean $require
     *
     * @return self
     */
    public function requireScopeParam($require = true)
    {
        $this->requireScopeParam = $require;

return $this;
    }

/**
     * Is the scope parameter required?
     *
     * @return bool
     */
    public function scopeParamRequired()
    {
        return $this->requireScopeParam;
    }

/**
     * Default scope to be used if none is provided and requireScopeParam() is false
     *
     * @param string $default Name of the default scope
     *
     * @return self
     */
    public function setDefaultScope($default = null)
    {
        $this->defaultScope = $default;

return $this;
    }

/**
     * Default scope to be used if none is provided and requireScopeParam is false
     *
     * @return string|null
     */
    public function getDefaultScope()
    {
        return $this->defaultScope;
    }

/**
     * Require the "state" parameter in checkAuthoriseParams()
     *
     * @return bool
     */
    public function stateParamRequired()
    {
        return $this->requireStateParam;
    }

/**
     * Require the "state" parameter in checkAuthoriseParams()
     *
     * @param boolean $require
     *
     * @return self
     */
    public function requireStateParam($require = true)
    {
        $this->requireStateParam = $require;

return $this;
    }

/**
     * Get the scope delimiter
     *
     * @return string The scope delimiter (default: ",")
     */
    public function getScopeDelimiter()
    {
        return $this->scopeDelimiter;
    }

/**
     * Set the scope delimiter
     *
     * @param string $scopeDelimiter
     *
     * @return self
     */
    public function setScopeDelimiter($scopeDelimiter = ' ')
    {
        $this->scopeDelimiter = $scopeDelimiter;

return $this;
    }

/**
     * Get the TTL for an access token
     *
     * @return int The TTL
     */
    public function getAccessTokenTTL()
    {
        return $this->accessTokenTTL;
    }

/**
     * Set the TTL for an access token
     *
     * @param int $accessTokenTTL The new TTL
     *
     * @return self
     */
    public function setAccessTokenTTL($accessTokenTTL = 3600)
    {
        $this->accessTokenTTL = $accessTokenTTL;

return $this;
    }

/**
     * Issue an access token
     *
     * @return array Authorise request parameters
     *
     * @throws
     */
    public function issueAccessToken()
    {
        $grantType = $this->getRequest()->request->get('grant_type');
        if (is_null($grantType)) {
            throw new Exception\InvalidRequestException('grant_type');
        }

// Ensure grant type is one that is recognised and is enabled
        if (!in_array($grantType, array_keys($this->grantTypes))) {
            throw new Exception\UnsupportedGrantTypeException($grantType);
        }

// Complete the flow
        return $this->getGrantType($grantType)->completeFlow();
    }

/**
     * Return a grant type class
     *
     * @param string $grantType The grant type identifier
     *
     * @return Grant\GrantTypeInterface
     *
     * @throws
     */
    public function getGrantType($grantType)
    {
        if (isset($this->grantTypes[$grantType])) {
            return $this->grantTypes[$grantType];
        }

throw new Exception\InvalidGrantException($grantType);
    }
}