AuthBucket\OAuth2\ResponseType\AbstractResponseTypeHandler::checkRedirectUri PHP Method

    protected function checkRedirectUri(Request $request, $clientId)
    {
        // redirect_uri may not exists.
        $redirectUri = $request->query->get('redirect_uri');
        $errors = $this->validator->validate($redirectUri, [new RedirectUri()]);
        if (count($errors) > 0) {
            throw new InvalidRequestException(['error_description' => 'The request includes an invalid parameter value.']);
        }
        // redirect_uri is not required if already established via other channels,
        // check an existing redirect URI against the one supplied.
        $redirectUriStored = null;
        $clientManager = $this->modelManagerFactory->getModelManager('client');
        $result = $clientManager->readModelOneBy(['clientId' => $clientId]);
        if ($result !== null && $result->getRedirectUri()) {
            $redirectUriStored = $result->getRedirectUri();
        }
        // At least one of: existing redirect URI or input redirect URI must be
        // specified.
        if (!$redirectUriStored && !$redirectUri) {
            throw new InvalidRequestException(['error_description' => 'The request is missing a required parameter.']);
        }
        // If there's an existing uri and one from input, verify that they match.
        if ($redirectUriStored && $redirectUri) {
            // Ensure that the input uri starts with the stored uri.
            if (strcasecmp(substr($redirectUri, 0, strlen($redirectUriStored)), $redirectUriStored) !== 0) {
                throw new InvalidRequestException(['error_description' => 'The request includes an invalid parameter value']);
            }
        }
        return $redirectUri ?: $redirectUriStored;
    }