Implement simple functionality for get and delete APIs as well

Signed-off-by: Derek Ho <dxho@amazon.com>

src/main/java/org/opensearch/security/action/apitokens/ApiTokenAction.java

@@ -28,22 +28,25 @@
 import org.opensearch.rest.RestRequest;
 import org.opensearch.threadpool.ThreadPool;
 
+import static org.opensearch.rest.RestRequest.Method.DELETE;
+import static org.opensearch.rest.RestRequest.Method.GET;
 import static org.opensearch.rest.RestRequest.Method.POST;
 import static org.opensearch.security.dlic.rest.support.Utils.addRoutesPrefix;
 
 public class ApiTokenAction extends BaseRestHandler {
-
-    private ClusterService clusterService;
-    private ThreadPool threadpool;
-    private ApiTokenRepository apiTokenRepository;
+    private final ApiTokenRepository apiTokenRepository;
 
     public static final String NAME_JSON_PROPERTY = "name";
 
-    private static final List<RestHandler.Route> ROUTES = addRoutesPrefix(ImmutableList.of(new RestHandler.Route(POST, "/apitokens")));
+    private static final List<RestHandler.Route> ROUTES = addRoutesPrefix(
+        ImmutableList.of(
+            new RestHandler.Route(POST, "/apitokens"),
+            new RestHandler.Route(DELETE, "/apitokens"),
+            new RestHandler.Route(GET, "/apitokens")
+        )
+    );
 
     public ApiTokenAction(ClusterService clusterService, ThreadPool threadPool, Client client) {
-        this.clusterService = clusterService;
-        this.threadpool = threadPool;
         this.apiTokenRepository = new ApiTokenRepository(client, clusterService);
     }
 
@@ -59,15 +62,49 @@ public List<RestHandler.Route> routes() {
 
     @Override
     protected RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
+        // TODO: Authorize this API properly
         switch (request.method()) {
             case POST:
                 return handlePost(request, client);
+            case DELETE:
+                return handleDelete(request, client);
+            case GET:
+                return handleGet(request, client);
             default:
                 throw new IllegalArgumentException(request.method() + " not supported");
         }
     }
 
+    private RestChannelConsumer handleGet(RestRequest request, NodeClient client) {
+        return channel -> {
+            final XContentBuilder builder = channel.newBuilder();
+            BytesRestResponse response;
+            try {
+                List<Map<String, Object>> token = apiTokenRepository.getApiTokens();
+
+                builder.startArray();
+                for (int i = 0; i < token.toArray().length; i++) {
+                    // TODO: refactor this to the helper function
+                    builder.startObject();
+                    builder.field("name", token.get(i).get("description"));
+                    builder.field("creation_time", token.get(i).get("creation_time"));
+                    builder.endObject();
+                }
+                builder.endArray();
+
+                response = new BytesRestResponse(RestStatus.OK, builder);
+            } catch (final Exception exception) {
+                builder.startObject().field("error", "An unexpected error occurred. Please check the input and try again.").endObject();
+                response = new BytesRestResponse(RestStatus.INTERNAL_SERVER_ERROR, builder);
+            }
+            builder.close();
+            channel.sendResponse(response);
+        };
+
+    }
+
     private RestChannelConsumer handlePost(RestRequest request, NodeClient client) {
+        // TODO: Enforce unique token description
         return channel -> {
             final XContentBuilder builder = channel.newBuilder();
             BytesRestResponse response;
@@ -92,6 +129,34 @@ private RestChannelConsumer handlePost(RestRequest request, NodeClient client) {
 
     }
 
+    private RestChannelConsumer handleDelete(RestRequest request, NodeClient client) {
+        return channel -> {
+            final XContentBuilder builder = channel.newBuilder();
+            BytesRestResponse response;
+            try {
+                final Map<String, Object> requestBody = request.contentOrSourceParamParser().map();
+
+                validateRequestParameters(requestBody);
+                apiTokenRepository.deleteApiToken((String) requestBody.get(NAME_JSON_PROPERTY));
+
+                builder.startObject();
+                builder.field("message", "token " + requestBody.get(NAME_JSON_PROPERTY) + " deleted successfully.");
+                builder.endObject();
+
+                response = new BytesRestResponse(RestStatus.OK, builder);
+            } catch (final ApiTokenException exception) {
+                builder.startObject().field("error", exception.getMessage()).endObject();
+                response = new BytesRestResponse(RestStatus.NOT_FOUND, builder);
+            } catch (final Exception exception) {
+                builder.startObject().field("error", "An unexpected error occurred. Please check the input and try again.").endObject();
+                response = new BytesRestResponse(RestStatus.INTERNAL_SERVER_ERROR, builder);
+            }
+            builder.close();
+            channel.sendResponse(response);
+        };
+
+    }
+
     private void validateRequestParameters(Map<String, Object> requestBody) {
         if (!requestBody.containsKey(NAME_JSON_PROPERTY)) {
             throw new IllegalArgumentException("Name parameter is required and cannot be empty.");

src/main/java/org/opensearch/security/action/apitokens/ApiTokenException.java

@@ -0,0 +1,24 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+package org.opensearch.security.action.apitokens;
+
+import org.opensearch.OpenSearchException;
+
+public class ApiTokenException extends OpenSearchException {
+    public ApiTokenException(String message) {
+        super(message);
+    }
+
+    public ApiTokenException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/org/opensearch/security/action/apitokens/ApiTokenIndexHandler.java

@@ -12,16 +12,19 @@
 package org.opensearch.security.action.apitokens;
 
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 
 import com.google.common.collect.ImmutableMap;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import org.opensearch.action.admin.indices.create.CreateIndexRequest;
-import org.opensearch.action.get.GetRequest;
 import org.opensearch.action.index.IndexRequest;
 import org.opensearch.action.index.IndexResponse;
+import org.opensearch.action.search.SearchRequest;
+import org.opensearch.action.search.SearchResponse;
 import org.opensearch.client.Client;
 import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.util.concurrent.ThreadContext;
@@ -30,6 +33,11 @@
 import org.opensearch.core.action.ActionListener;
 import org.opensearch.core.xcontent.ToXContent;
 import org.opensearch.core.xcontent.XContentBuilder;
+import org.opensearch.index.query.QueryBuilders;
+import org.opensearch.index.reindex.BulkByScrollResponse;
+import org.opensearch.index.reindex.DeleteByQueryAction;
+import org.opensearch.index.reindex.DeleteByQueryRequest;
+import org.opensearch.search.SearchHit;
 import org.opensearch.security.support.ConfigConstants;
 
 public class ApiTokenIndexHandler {
@@ -67,11 +75,36 @@ public String indexToken(ApiToken token) {
 
     }
 
-    public Object getTokens() {
+    public void deleteToken(String name) throws ApiTokenException {
         try (final ThreadContext.StoredContext ctx = client.threadPool().getThreadContext().stashContext()) {
+            DeleteByQueryRequest request = new DeleteByQueryRequest(ConfigConstants.OPENSEARCH_API_TOKENS_INDEX).setQuery(
+                QueryBuilders.matchQuery("description", name)
+            ).setRefresh(true);  // This will refresh the index after deletion
 
-            return client.get(new GetRequest(ConfigConstants.OPENSEARCH_API_TOKENS_INDEX));
+            BulkByScrollResponse response = client.execute(DeleteByQueryAction.INSTANCE, request).actionGet();
 
+            long deletedDocs = response.getDeleted();
+
+            if (deletedDocs == 0) {
+                throw new ApiTokenException("No token found with name " + name);
+            }
+            LOGGER.info("Deleted " + deletedDocs + " documents");
+        }
+    }
+
+    public List<Map<String, Object>> getApiTokens() {
+        try (final ThreadContext.StoredContext ctx = client.threadPool().getThreadContext().stashContext()) {
+
+            SearchRequest searchRequest = new SearchRequest(ConfigConstants.OPENSEARCH_API_TOKENS_INDEX);
+
+            SearchResponse response = client.search(searchRequest).actionGet();
+
+            List<Map<String, Object>> tokens = new ArrayList<>();
+            for (SearchHit hit : response.getHits().getHits()) {
+                tokens.add(hit.getSourceAsMap());
+            }
+
+            return tokens;
         }
     }
 

src/main/java/org/opensearch/security/action/apitokens/ApiTokenRepository.java

@@ -12,6 +12,7 @@
 package org.opensearch.security.action.apitokens;
 
 import java.util.List;
+import java.util.Map;
 
 import org.opensearch.client.Client;
 import org.opensearch.cluster.service.ClusterService;
@@ -25,8 +26,17 @@ public ApiTokenRepository(Client client, ClusterService clusterService) {
 
     public String createApiToken(String name) {
         apiTokenIndexHandler.createApiTokenIndexIfAbsent();
-        String token = apiTokenIndexHandler.indexToken(new ApiToken(name, "test-token", List.of()));
-        return token;
+        return apiTokenIndexHandler.indexToken(new ApiToken(name, "test-token", List.of()));
+    }
+
+    public void deleteApiToken(String name) throws ApiTokenException {
+        apiTokenIndexHandler.createApiTokenIndexIfAbsent();
+        apiTokenIndexHandler.deleteToken(name);
+    }
+
+    public List<Map<String, Object>> getApiTokens() {
+        apiTokenIndexHandler.createApiTokenIndexIfAbsent();
+        return apiTokenIndexHandler.getApiTokens();
     }
 
 }