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/*
* Copyright (C) 2018, 2022 Google LLC. 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.GitProtocolConstants.OPTION_FILTER;
import static org.eclipse.jgit.transport.GitProtocolConstants.PACKET_DEEPEN;
import static org.eclipse.jgit.transport.GitProtocolConstants.PACKET_DEEPEN_NOT;
import static org.eclipse.jgit.transport.GitProtocolConstants.PACKET_DEEPEN_SINCE;
import static org.eclipse.jgit.transport.GitProtocolConstants.PACKET_SHALLOW;
import static org.eclipse.jgit.transport.GitProtocolConstants.PACKET_WANT;
import java.io.EOFException;
import java.io.IOException;
import java.text.MessageFormat;
import org.eclipse.jgit.errors.PackProtocolException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.internal.transport.parser.FirstWant;
import org.eclipse.jgit.lib.ObjectId;
/**
* Parser for git protocol versions 0 and 1.
*
* It reads the lines coming through the {@link PacketLineIn} and builds a
* {@link FetchV0Request} object.
*
* It requires a transferConfig object to know if the server supports filters.
*/
final class ProtocolV0Parser {
private final TransferConfig transferConfig;
ProtocolV0Parser(TransferConfig transferConfig) {
this.transferConfig = transferConfig;
}
/**
* Parse an incoming protocol v1 upload request arguments from the wire.
*
* The incoming PacketLineIn is consumed until an END line, but the caller
* is responsible for closing it (if needed).
*
* @param pckIn
* incoming lines. This method will read until an END line.
* @return a FetchV0Request with the data received in the wire.
* @throws PackProtocolException
* @throws IOException
*/
FetchV0Request recvWants(PacketLineIn pckIn)
throws PackProtocolException, IOException {
FetchV0Request.Builder reqBuilder = new FetchV0Request.Builder();
boolean isFirst = true;
boolean filterReceived = false;
for (;;) {
String line;
try {
line = pckIn.readString();
} catch (EOFException eof) {
if (isFirst) {
break;
}
throw eof;
}
if (PacketLineIn.isEnd(line)) {
break;
}
if (line.startsWith(PACKET_DEEPEN)) {
int depth = Integer
.parseInt(line.substring(PACKET_DEEPEN.length()));
if (depth <= 0) {
throw new PackProtocolException(
MessageFormat.format(JGitText.get().invalidDepth,
Integer.valueOf(depth)));
}
if (reqBuilder.getDeepenSince() != 0) {
throw new PackProtocolException(
JGitText.get().deepenSinceWithDeepen);
}
if (reqBuilder.hasDeepenNots()) {
throw new PackProtocolException(
JGitText.get().deepenNotWithDeepen);
}
reqBuilder.setDepth(depth);
continue;
}
if (line.startsWith(PACKET_DEEPEN_NOT)) {
reqBuilder.addDeepenNot(
line.substring(PACKET_DEEPEN_NOT.length()));
if (reqBuilder.getDepth() != 0) {
throw new PackProtocolException(
JGitText.get().deepenNotWithDeepen);
}
continue;
}
if (line.startsWith(PACKET_DEEPEN_SINCE)) {
// TODO: timestamps should be long
int ts = Integer
.parseInt(line.substring(PACKET_DEEPEN_SINCE.length()));
if (ts <= 0) {
throw new PackProtocolException(MessageFormat
.format(JGitText.get().invalidTimestamp, line));
}
if (reqBuilder.getDepth() != 0) {
throw new PackProtocolException(
JGitText.get().deepenSinceWithDeepen);
}
reqBuilder.setDeepenSince(ts);
continue;
}
if (line.startsWith(PACKET_SHALLOW)) {
reqBuilder.addClientShallowCommit(
ObjectId.fromString(
line.substring(PACKET_SHALLOW.length())));
continue;
}
if (transferConfig.isAllowFilter()
&& line.startsWith(OPTION_FILTER + " ")) { //$NON-NLS-1$
String arg = line.substring(OPTION_FILTER.length() + 1);
if (filterReceived) {
throw new PackProtocolException(
JGitText.get().tooManyFilters);
}
filterReceived = true;
reqBuilder.setFilterSpec(FilterSpec.fromFilterLine(arg));
continue;
}
if (!line.startsWith(PACKET_WANT) || line.length() < 45) {
throw new PackProtocolException(MessageFormat
.format(JGitText.get().expectedGot, "want", line)); //$NON-NLS-1$
}
if (isFirst) {
if (line.length() > 45) {
FirstWant firstLine = FirstWant.fromLine(line);
reqBuilder.addClientCapabilities(firstLine.getCapabilities());
reqBuilder.setAgent(firstLine.getAgent());
line = firstLine.getLine();
}
}
reqBuilder.addWantId(
ObjectId.fromString(line.substring(PACKET_WANT.length())));
isFirst = false;
}
return reqBuilder.build();
}
}
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