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The Cross-listing Assistant in Canvas at Indiana University is a utility for combining enrollments from multiple course sections into a single primary course site, which reduces the administrative overhead of managing a separate version of the course for each section.

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package edu.iu.uits.lms.crosslist.config;

/*-
 * #%L
 * lms-lti-crosslist
 * %%
 * Copyright (C) 2015 - 2022 Indiana University
 * %%
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * 3. Neither the name of the Indiana University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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import edu.iu.uits.lms.lti.LTIConstants;
import edu.iu.uits.lms.lti.repository.DefaultInstructorRoleRepository;
import edu.iu.uits.lms.lti.service.LmsDefaultGrantedAuthoritiesMapper;
import lombok.extern.slf4j.Slf4j;

import java.util.Arrays;
import java.util.List;

@Slf4j
public class CustomRoleMapper extends LmsDefaultGrantedAuthoritiesMapper {

   private ToolConfig toolConfig;

   public CustomRoleMapper(DefaultInstructorRoleRepository defaultInstructorRoleRepository, ToolConfig toolConfig) {
      super(defaultInstructorRoleRepository);
      this.toolConfig = toolConfig;
   }

   @Override
   protected String returnEquivalentAuthority(String[] userRoles, List instructorRoles) {
      List userRoleList = Arrays.asList(userRoles);
      List adminRoleList = toolConfig.getAdminRoles();

      // check for admins first
      for (String adminRole : adminRoleList) {
         if (userRoleList.contains(adminRole)) {
            return LTIConstants.ADMIN_AUTHORITY;
         }
      }

      //Then do normal stuff
      return super.returnEquivalentAuthority(userRoles, instructorRoles);
   }
}