| // Copyright (C) 2023 The Android Open Source Project |
| // |
| // Licensed 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 com.googlesource.gerrit.plugins.replication.pull.api.util; |
| |
| import static javax.servlet.http.HttpServletResponse.SC_CREATED; |
| import static javax.servlet.http.HttpServletResponse.SC_OK; |
| |
| import com.google.common.flogger.FluentLogger; |
| import com.google.gerrit.extensions.api.projects.HeadInput; |
| import com.google.gerrit.extensions.restapi.BadRequestException; |
| import com.google.gerrit.extensions.restapi.Response; |
| import com.google.gerrit.httpd.restapi.RestApiServlet; |
| import com.google.gerrit.json.OutputFormat; |
| import com.google.gson.Gson; |
| import com.google.gson.stream.JsonReader; |
| import com.google.inject.TypeLiteral; |
| import com.googlesource.gerrit.plugins.replication.pull.api.FetchAction; |
| import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionInput; |
| import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionsInput; |
| import java.io.BufferedReader; |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| public class PayloadSerDes { |
| private static final FluentLogger logger = FluentLogger.forEnclosingClass(); |
| private static final Gson gson = OutputFormat.JSON.newGsonBuilder().create(); |
| |
| public static RevisionInput parseRevisionInput(HttpServletRequest httpRequest) |
| throws BadRequestException, IOException { |
| return parse(httpRequest, TypeLiteral.get(RevisionInput.class)); |
| } |
| |
| public static RevisionsInput parseRevisionsInput(HttpServletRequest httpRequest) |
| throws BadRequestException, IOException { |
| return parse(httpRequest, TypeLiteral.get(RevisionsInput.class)); |
| } |
| |
| public static HeadInput parseHeadInput(HttpServletRequest httpRequest) |
| throws BadRequestException, IOException { |
| return parse(httpRequest, TypeLiteral.get(HeadInput.class)); |
| } |
| |
| public static FetchAction.Input parseInput(HttpServletRequest httpRequest) |
| throws BadRequestException, IOException { |
| return parse(httpRequest, TypeLiteral.get(FetchAction.Input.class)); |
| } |
| |
| public static <T> void writeResponse(HttpServletResponse httpResponse, Response<T> response) |
| throws IOException { |
| String responseJson = gson.toJson(response); |
| if (response.statusCode() == SC_OK || response.statusCode() == SC_CREATED) { |
| |
| httpResponse.setContentType("application/json"); |
| httpResponse.setStatus(response.statusCode()); |
| PrintWriter writer = httpResponse.getWriter(); |
| writer.print(new String(RestApiServlet.JSON_MAGIC)); |
| writer.print(responseJson); |
| } else { |
| httpResponse.sendError(response.statusCode(), responseJson); |
| } |
| } |
| |
| private static <T> T parse(HttpServletRequest httpRequest, TypeLiteral<T> typeLiteral) |
| throws IOException, BadRequestException { |
| |
| try (BufferedReader br = httpRequest.getReader(); |
| JsonReader json = new JsonReader(br)) { |
| try { |
| json.setLenient(true); |
| |
| try { |
| json.peek(); |
| } catch (EOFException e) { |
| throw new BadRequestException("Expected JSON object", e); |
| } |
| |
| return gson.fromJson(json, typeLiteral.getType()); |
| } finally { |
| try { |
| // Reader.close won't consume the rest of the input. Explicitly consume the request |
| // body. |
| br.skip(Long.MAX_VALUE); |
| } catch (Exception e) { |
| // ignore, e.g. trying to consume the rest of the input may fail if the request was |
| // cancelled |
| logger.atFine().withCause(e).log("Exception during the parsing of the request json"); |
| } |
| } |
| } |
| } |
| } |