src/Authenticator.php
protected function getCode()
    {
        $storage = $this->getStorage();

        if (!GlobalVariableGetter::has('code')) {
            return;
        }

        if ($storage->get('code') === GlobalVariableGetter::get('code')) {
            //we have already validated this code
            return;
        }

        // if stored state does not exists
        if (null === $state = $storage->get('state')) {
            throw new LinkedInException('Could not find a stored CSRF state token.');
        }

        // if state not exists in the request
        if (!GlobalVariableGetter::has('state')) {
            throw new LinkedInException('Could not find a CSRF state token in the request.');
        }

        // if state exists in session and in request and if they are not equal
        if ($state !== GlobalVariableGetter::get('state')) {
            throw new LinkedInException('The CSRF state token from the request does not match the stored token.');
        }

        // CSRF state has done its job, so clear it
        $storage->clear('state');

        return GlobalVariableGetter::get('code');
    }
protected function getCode()
    {
        $storage = $this->getStorage();

        if (!GlobalVariableGetter::has('code')) {
            return;
        }

        if ($storage->get('code') === GlobalVariableGetter::get('code')) {
            //we have already validated this code
            return;
        }

        // if stored state does not exists
        if (null === $state = $storage->get('state')) {
            throw new LinkedInException('Could not find a stored CSRF state token.');
        }

        // if state not exists in the request
        if (!GlobalVariableGetter::has('state')) {
            throw new LinkedInException('Could not find a CSRF state token in the request.');
        }

        // if state exists in session and in request and if they are not equal
        if ($state !== GlobalVariableGetter::get('state')) {
            throw new LinkedInException('The CSRF state token from the request does not match the stored token.');
        }

        // CSRF state has done its job, so clear it
        $storage->clear('state');

        return GlobalVariableGetter::get('code');
    }
protected function getCode ( ) { $ storage = $ this -> getStorage ( ) ; if ( ! GlobalVariableGetter :: has ( 'code' ) ) { return ; } if ( $ storage -> get ( 'code' ) === GlobalVariableGetter :: get ( 'code' ) ) { //we have already validated this code return ; } // if stored state does not exists if ( null === $ state = $ storage -> get ( 'state' ) ) { throw new LinkedInException ( 'Could not find a stored CSRF state token.' ) ; } // if state not exists in the request if ( ! GlobalVariableGetter :: has ( 'state' ) ) { throw new LinkedInException ( 'Could not find a CSRF state token in the request.' ) ; } // if state exists in session and in request and if they are not equal if ( $ state !== GlobalVariableGetter :: get ( 'state' ) ) { throw new LinkedInException ( 'The CSRF state token from the request does not match the stored token.' ) ; } // CSRF state has done its job, so clear it $ storage -> clear ( 'state' ) ; return GlobalVariableGetter :: get ( 'code' ) ; }
Get the authorization code from the query parameters, if it exists,
and otherwise return null to signal no authorization code was
discovered.

@return string|null The authorization code, or null if the authorization code not exists.

@throws LinkedInException on invalid CSRF tokens
Get the authorization code from the query parameters if it exists and otherwise return null to signal no authorization code was discovered .