/*
    * Copyright (C) 2015, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.transport;
  
  import static org.eclipse.jgit.transport.BasePackPushConnection.CAPABILITY_REPORT_STATUS;
  import static org.eclipse.jgit.transport.BasePackPushConnection.CAPABILITY_SIDE_BAND_64K;
  import static org.eclipse.jgit.transport.RemoteRefUpdate.Status.REJECTED_OTHER_REASON;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.fail;
  
  import java.io.IOException;
  import java.io.StringWriter;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.jgit.errors.TransportException;
  import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription;
  import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
  import org.eclipse.jgit.junit.TestRepository;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.NullProgressMonitor;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.ObjectInserter;
  import org.eclipse.jgit.lib.RefUpdate;
  import org.eclipse.jgit.lib.Repository;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  public class PushConnectionTest {
  	private URIish uri;
  	private TestProtocol<Object> testProtocol;
  	private Object ctx = new Object();
  	private InMemoryRepository server;
  	private InMemoryRepository client;
  	private List<String> processedRefs;
  	private ObjectId obj1;
  	private ObjectId obj2;
  	private ObjectId obj3;
  	private String refName = "refs/tags/blob";
  
  	@Before
  	public void setUp() throws Exception {
  		server = newRepo("server");
  		client = newRepo("client");
  		processedRefs = new ArrayList<>();
  		testProtocol = new TestProtocol<>(null, (Object req, Repository db) -> {
  			ReceivePack rp = new ReceivePack(db);
  			rp.setPreReceiveHook((ReceivePack receivePack,
  					Collection<ReceiveCommand> cmds) -> {
  				for (ReceiveCommand cmd : cmds) {
  					processedRefs.add(cmd.getRefName());
  				}
  			});
  			return rp;
  		});
  		uri = testProtocol.register(ctx, server);
  
  		try (ObjectInserter ins = server.newObjectInserter()) {
  			obj1 = ins.insert(Constants.OBJ_BLOB, Constants.encode("test"));
  			obj3 = ins.insert(Constants.OBJ_BLOB, Constants.encode("not"));
  			ins.flush();
  
  			RefUpdate u = server.updateRef(refName);
  			u.setNewObjectId(obj1);
  			assertEquals(RefUpdate.Result.NEW, u.update());
  		}
  
  		try (ObjectInserter ins = client.newObjectInserter()) {
  			obj2 = ins.insert(Constants.OBJ_BLOB, Constants.encode("file"));
  			ins.flush();
  		}
  	}
  
  	@After
  	public void tearDown() {
  		Transport.unregister(testProtocol);
  	}
  
  	private static InMemoryRepository newRepo(String name) {
  		return new InMemoryRepository(new DfsRepositoryDescription(name));
  	}
  
  	@Test
  	public void testWrongOldIdDoesNotReplace() throws IOException {
  		RemoteRefUpdate rru = new RemoteRefUpdate(null, null, obj2, refName,
  				false, null, obj3);
  
 		Map<String, RemoteRefUpdate> updates = new HashMap<>();
 		updates.put(rru.getRemoteName(), rru);
 
 		try (Transport tn = testProtocol.open(uri, client, "server");
 				PushConnection connection = tn.openPush()) {
 			connection.push(NullProgressMonitor.INSTANCE, updates);
 		}
 
 		assertEquals(REJECTED_OTHER_REASON, rru.getStatus());
 		assertEquals("invalid old id sent", rru.getMessage());
 	}
 
 	@Test
 	public void invalidCommand() throws IOException {
 		try (Transport tn = testProtocol.open(uri, client, "server");
 				InternalPushConnection c = (InternalPushConnection) tn.openPush()) {
 			StringWriter msgs = new StringWriter();
 			PacketLineOut pckOut = c.pckOut;
 
 			@SuppressWarnings("resource")
 			SideBandInputStream in = new SideBandInputStream(c.in,
 					NullProgressMonitor.INSTANCE, msgs, null);
 
 			// Explicitly invalid command, but sane enough capabilities.
 			StringBuilder buf = new StringBuilder();
 			buf.append("42");
 			buf.append(' ');
 			buf.append(obj2.name());
 			buf.append(' ');
 			buf.append("refs/heads/A" + obj2.name());
 			buf.append('\0').append(CAPABILITY_SIDE_BAND_64K);
 			buf.append(' ').append(CAPABILITY_REPORT_STATUS);
 			buf.append('\n');
 			pckOut.writeString(buf.toString());
 			pckOut.end();
 
 			try {
 				in.read();
 				fail("expected TransportException");
 			} catch (TransportException e) {
 				assertEquals(
 						"remote: error: invalid protocol: wanted 'old new ref'",
 						e.getMessage());
 			}
 		}
 	}
 
 	@Test
 	public void limitCommandBytes() throws IOException {
 		Map<String, RemoteRefUpdate> updates = new HashMap<>();
 		for (int i = 0; i < 4; i++) {
 			RemoteRefUpdate rru = new RemoteRefUpdate(
 					null, null, obj2, "refs/test/T" + i,
 					false, null, ObjectId.zeroId());
 			updates.put(rru.getRemoteName(), rru);
 		}
 
 		server.getConfig().setInt("receive", null, "maxCommandBytes", 195);
 		try (Transport tn = testProtocol.open(uri, client, "server");
 				PushConnection connection = tn.openPush()) {
 			try {
 				connection.push(NullProgressMonitor.INSTANCE, updates);
 				fail("server did not abort");
 			} catch (TransportException e) {
 				String msg = e.getMessage();
 				assertEquals(
 						"remote: Commands size exceeds limit defined in receive.maxCommandBytes",
 						msg);
 			}
 		}
 	}
 
 	@Test
 	public void commandOrder() throws Exception {
 		List<RemoteRefUpdate> updates = new ArrayList<>();
 		try (TestRepository<?> tr = new TestRepository<>(client)) {
 			// Arbitrary non-sorted order.
 			for (int i = 9; i >= 0; i--) {
 				String name = "refs/heads/b" + i;
 				tr.branch(name).commit().create();
 				RemoteRefUpdate rru = new RemoteRefUpdate(client, name, name,
 						false, null, ObjectId.zeroId());
 				updates.add(rru);
 			}
 		}
 
 		PushResult result;
 		try (Transport tn = testProtocol.open(uri, client, "server")) {
 			result = tn.push(NullProgressMonitor.INSTANCE, updates);
 		}
 
 		for (RemoteRefUpdate remoteUpdate : result.getRemoteUpdates()) {
 			assertEquals(
 					"update should succeed on " + remoteUpdate.getRemoteName(),
 					RemoteRefUpdate.Status.OK, remoteUpdate.getStatus());
 		}
 
 		List<String> expected = remoteRefNames(updates);
 		assertEquals(
 				"ref names processed by ReceivePack should match input ref names in order",
 				expected, processedRefs);
 		assertEquals(
 				"remote ref names should match input ref names in order",
 				expected, remoteRefNames(result.getRemoteUpdates()));
 	}
 
 	private static List<String> remoteRefNames(Collection<RemoteRefUpdate> updates) {
 		List<String> result = new ArrayList<>();
 		for (RemoteRefUpdate u : updates) {
 			result.add(u.getRemoteName());
 		}
 		return result;
 	}
 }