content: /*
   * 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.bifromq.apiserver.http.handler;
  
  import static io.netty.handler.codec.http.HttpResponseStatus.INTERNAL_SERVER_ERROR;
  import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
  import static io.netty.handler.codec.http.HttpResponseStatus.OK;
  import static org.apache.bifromq.apiserver.Headers.HEADER_CLIENT_ID;
  import static org.apache.bifromq.apiserver.Headers.HEADER_USER_ID;
  import static org.apache.bifromq.apiserver.http.handler.utils.HeaderUtils.getHeader;
  
  import com.google.protobuf.util.JsonFormat;
  import io.netty.buffer.Unpooled;
  import io.netty.handler.codec.http.DefaultFullHttpResponse;
  import io.netty.handler.codec.http.FullHttpRequest;
  import io.netty.handler.codec.http.FullHttpResponse;
  import io.swagger.v3.oas.annotations.Operation;
  import io.swagger.v3.oas.annotations.Parameter;
  import io.swagger.v3.oas.annotations.Parameters;
  import io.swagger.v3.oas.annotations.enums.ParameterIn;
  import io.swagger.v3.oas.annotations.media.Content;
  import io.swagger.v3.oas.annotations.media.Schema;
  import io.swagger.v3.oas.annotations.parameters.RequestBody;
  import io.swagger.v3.oas.annotations.responses.ApiResponse;
  import io.swagger.v3.oas.annotations.responses.ApiResponses;
  import jakarta.ws.rs.GET;
  import jakarta.ws.rs.Path;
  import java.util.concurrent.CompletableFuture;
  import lombok.SneakyThrows;
  import org.apache.bifromq.plugin.settingprovider.ISettingProvider;
  import org.apache.bifromq.sessiondict.client.ISessionDictClient;
  import org.apache.bifromq.sessiondict.rpc.proto.GetRequest;
  import org.apache.bifromq.type.ClientInfo;
  
  @Path("/session")
  final class GetSessionInfoHandler extends TenantAwareHandler {
      private final ISessionDictClient sessionDictClient;
  
      GetSessionInfoHandler(ISettingProvider settingProvider, ISessionDictClient sessionDictClient) {
          super(settingProvider);
          this.sessionDictClient = sessionDictClient;
      }
  
      @GET
      @Operation(summary = "Get the session information of the given user and client id")
  
      @Parameters({
          @Parameter(name = "req_id", in = ParameterIn.HEADER,
              description = "optional caller provided request id", schema = @Schema(implementation = Long.class)),
          @Parameter(name = "tenant_id", in = ParameterIn.HEADER, required = true,
              description = "the id of tenant", schema = @Schema(implementation = String.class)),
          @Parameter(name = "user_id", in = ParameterIn.HEADER, required = true,
              description = "the id of user who established the session",
              schema = @Schema(implementation = String.class)),
          @Parameter(name = "client_id", in = ParameterIn.HEADER, required = true,
              description = "the client id of the mqtt session", schema = @Schema(implementation = String.class)),
      })
      @RequestBody(required = false)
      @ApiResponses(value = {
          @ApiResponse(responseCode = "200",
              description = "Success",
              content = @Content(mediaType = "application/json")),
          @ApiResponse(responseCode = "404", description = "No session found for the given user and client id",
              content = @Content(schema = @Schema(implementation = String.class))),
      })
      @Override
      public CompletableFuture<FullHttpResponse> handle(@Parameter(hidden = true) long reqId,
                                                        @Parameter(hidden = true) String tenantId,
                                                        @Parameter(hidden = true) FullHttpRequest req) {
          String userId = getHeader(HEADER_USER_ID, req, true);
          String clientId = getHeader(HEADER_CLIENT_ID, req, true);
          return sessionDictClient.get(GetRequest.newBuilder()
                  .setReqId(reqId)
                  .setTenantId(tenantId)
                  .setUserId(userId)
                  .setClientId(clientId)
                  .build())
              .thenApply(reply -> switch (reply.getResult()) {
                  // return clientInfo as json response body
                  case OK -> {
                      DefaultFullHttpResponse resp = new DefaultFullHttpResponse(req.protocolVersion(), OK,
                          Unpooled.wrappedBuffer(toJSON(reply.getOwner()).getBytes()));
                      resp.headers().set("Content-Type", "application/json");
                      yield resp;
                  }
                  case NOT_FOUND -> new DefaultFullHttpResponse(req.protocolVersion(), NOT_FOUND, Unpooled.EMPTY_BUFFER);
                  default -> new DefaultFullHttpResponse(req.protocolVersion(), INTERNAL_SERVER_ERROR,
                      Unpooled.EMPTY_BUFFER);
              });
      }
  
      @SneakyThrows
      private String toJSON(ClientInfo clientInfo) {
          return JsonFormat.printer().print(clientInfo);
      }
  }
  