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File: SubmissionAuthorPolicy.inc.php
<?php
/**
 * @file classes/security/authorization/internal/SubmissionAuthorPolicy.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class SubmissionAuthorPolicy
 * @ingroup security_authorization_internal
 *
 * @brief Class to control access to a submission based on authorship.
 *
 * NB: This policy expects a previously authorized submission in the
 * authorization context.
 */

import('lib.pkp.classes.security.authorization.AuthorizationPolicy');
import('lib.pkp.classes.security.authorization.internal.UserAccessibleWorkflowStageRequiredPolicy');

class SubmissionAuthorPolicy extends AuthorizationPolicy {
	/** @var PKPRequest */
	var $_request;

	/**
	 * Constructor
	 * @param $request PKPRequest
	 */
	function __construct($request) {
		parent::__construct('user.authorization.submissionAuthor');
		$this->_request = $request;
	}

	//
	// Implement template methods from AuthorizationPolicy
	//
	/**
	 * @see AuthorizationPolicy::effect()
	 */
	function effect() {
		// Get the user
		$user = $this->_request->getUser();
		if (!is_a($user, 'User')) return AUTHORIZATION_DENY;

		// Get the submission
		$submission = $this->getAuthorizedContextObject(ASSOC_TYPE_SUBMISSION);
		if (!is_a($submission, 'Submission')) return AUTHORIZATION_DENY;

		$context = $this->_request->getContext();

		// Check authorship of the submission. Any ROLE_ID_AUTHOR assignment will do.
		$stageAssignmentDao = DAORegistry::getDAO('StageAssignmentDAO'); /* @var $stageAssignmentDao StageAssignmentDAO */
		$userGroupDao = DAORegistry::getDAO('UserGroupDAO'); /* @var $userGroupDao UserGroupDAO */
		$submitterAssignments = $stageAssignmentDao->getBySubmissionAndStageId($submission->getId(), null, null, $user->getId());
		$workflowStages = Application::getApplicationStages();
		while ($assignment = $submitterAssignments->next()) {
			$userGroup = $userGroupDao->getById($assignment->getUserGroupId());
			if ($userGroup->getRoleId() == ROLE_ID_AUTHOR) {

				$accessibleWorkflowStages = array();
				foreach ($workflowStages as $stageId) {
					$accessibleStageRoles = Services::get('user')->getAccessibleStageRoles($user->getId(), $context->getId(), $submission, $stageId);
					if (!empty($accessibleStageRoles)) {
						$accessibleWorkflowStages[$stageId] = $accessibleStageRoles;
					}
				}
				$this->addAuthorizedContextObject(ASSOC_TYPE_ACCESSIBLE_WORKFLOW_STAGES, $accessibleWorkflowStages);

				return AUTHORIZATION_PERMIT;
			}
		}
		return AUTHORIZATION_DENY;
	}
}