thelabdude commented on a change in pull request #355:
URL: https://github.com/apache/solr/pull/355#discussion_r732902326



##########
File path: 
solr/core/src/java/org/apache/solr/security/MultiAuthRuleBasedAuthorizationPlugin.java
##########
@@ -0,0 +1,102 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.security;
+
+import java.security.Principal;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.lucene.util.ResourceLoader;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.common.StringUtils;
+import org.apache.solr.core.CoreContainer;
+
+/**
+ * Authorization plugin designed to work with the MultiAuthPlugin to support 
different AuthorizationPlugin per scheme.
+ */
+public class MultiAuthRuleBasedAuthorizationPlugin extends 
RuleBasedAuthorizationPluginBase {
+  private final Map<String, RuleBasedAuthorizationPluginBase> pluginMap = new 
LinkedHashMap<>();
+  private final ResourceLoader loader;
+
+  // Need the CC to get the resource loader for loading the sub-plugins
+  public MultiAuthRuleBasedAuthorizationPlugin(CoreContainer cc) {
+    this.loader = cc.getResourceLoader();
+  }
+
+  @Override
+  @SuppressWarnings({"unchecked"})
+  public void init(Map<String, Object> initInfo) {
+    super.init(initInfo);
+
+    Object o = initInfo.get(MultiAuthPlugin.PROPERTY_SCHEMES);
+    if (!(o instanceof List)) {
+      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Invalid 
config: "+getClass().getName()+" requires a list of schemes!");
+    }
+
+    List<Object> schemeList = (List<Object>) o;
+    if (schemeList.size() < 2) {
+      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Invalid 
config: "+getClass().getName()+" requires at least two schemes!");
+    }
+
+    for (Object s : schemeList) {
+      if (!(s instanceof Map)) {
+        throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Invalid 
scheme config, expected JSON object but found: " + s);
+      }
+      initPluginForScheme((Map<String, Object>) s);
+    }
+  }
+
+  protected void initPluginForScheme(Map<String, Object> schemeMap) {
+    Map<String, Object> schemeConfig = new HashMap<>(schemeMap);
+
+    String scheme = (String) 
schemeConfig.remove(MultiAuthPlugin.PROPERTY_SCHEME);
+    if (StringUtils.isEmpty(scheme)) {
+      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "'scheme' 
is a required attribute: " + schemeMap);
+    }
+
+    String clazz = (String) schemeConfig.remove("class");
+    if (StringUtils.isEmpty(clazz)) {
+      throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "'class' 
is a required attribute: " + schemeMap);
+    }
+
+    RuleBasedAuthorizationPluginBase pluginForScheme = 
loader.newInstance(clazz, RuleBasedAuthorizationPluginBase.class);
+    pluginForScheme.init(schemeConfig);
+    pluginMap.put(scheme.toLowerCase(Locale.ROOT), pluginForScheme);
+  }
+
+  /**
+   * Pulls roles from the Principal
+   *
+   * @param principal the user Principal which should contain roles
+   * @return set of roles as strings
+   */
+  @Override
+  public Set<String> getUserRoles(Principal principal) {
+    for (RuleBasedAuthorizationPluginBase plugin : pluginMap.values()) {
+      final Set<String> userRoles = plugin.getUserRoles(principal);
+      if (userRoles != null && !userRoles.isEmpty()) {
+        return userRoles; // first non-empty match wins

Review comment:
       Maybe I get rid of the `default-scheme` and the first in the list is 
considered the "default" ... that way, whenever we loop over the schemes, the 
default would apply first. Alternatively, we could merge the role sets into 
one? Either seems reasonable to me ... My guess is that 99% of the cases, they 
won't have overlapping users between the schemes




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