| /* |
| * Copyright (C) 2018, 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.internal.transport.parser; |
| |
| import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_AGENT; |
| import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_SESSION_ID; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.jgit.annotations.Nullable; |
| import org.eclipse.jgit.errors.PackProtocolException; |
| import org.eclipse.jgit.internal.JGitText; |
| |
| /** |
| * In the pack negotiation phase (protocol v0/v1), the client sends a list of |
| * wants. The first "want" line is special, as it (can) have a list of |
| * capabilities appended. |
| * |
| * E.g. "want oid cap1 cap2 cap3" |
| * |
| * Do not confuse this line with the first one in the reference advertisement, |
| * which is sent by the server, looks like |
| * "b8f7c471373b8583ced0025cfad8c9916c484b76 HEAD\0 cap1 cap2 cap3" and is |
| * parsed by the BasePackConnection.readAdvertisedRefs method. |
| * |
| * This class parses the input want line and holds the results: the actual want |
| * line and the capabilities. |
| * |
| */ |
| public class FirstWant { |
| private final String line; |
| |
| private final Set<String> capabilities; |
| |
| @Nullable |
| private final String agent; |
| |
| @Nullable |
| private final String clientSID; |
| |
| private static final String AGENT_PREFIX = OPTION_AGENT + '='; |
| |
| private static final String SESSION_ID_PREFIX = OPTION_SESSION_ID + '='; |
| |
| /** |
| * Parse the first want line in the protocol v0/v1 pack negotiation. |
| * |
| * @param line |
| * line from the client. |
| * @return an instance of FirstWant |
| * @throws PackProtocolException |
| * if the line doesn't follow the protocol format. |
| */ |
| public static FirstWant fromLine(String line) throws PackProtocolException { |
| String wantLine; |
| Set<String> capabilities; |
| String agent = null; |
| String clientSID = null; |
| |
| if (line.length() > 45) { |
| String opt = line.substring(45); |
| if (!opt.startsWith(" ")) { //$NON-NLS-1$ |
| throw new PackProtocolException(JGitText.get().wantNoSpaceWithCapabilities); |
| } |
| opt = opt.substring(1); |
| |
| HashSet<String> opts = new HashSet<>(); |
| for (String clientCapability : opt.split(" ")) { //$NON-NLS-1$ |
| if (clientCapability.startsWith(AGENT_PREFIX)) { |
| agent = clientCapability.substring(AGENT_PREFIX.length()); |
| } else if (clientCapability.startsWith(SESSION_ID_PREFIX)) { |
| clientSID = clientCapability |
| .substring(SESSION_ID_PREFIX.length()); |
| } else { |
| opts.add(clientCapability); |
| } |
| } |
| wantLine = line.substring(0, 45); |
| capabilities = Collections.unmodifiableSet(opts); |
| } else { |
| wantLine = line; |
| capabilities = Collections.emptySet(); |
| } |
| |
| return new FirstWant(wantLine, capabilities, agent, clientSID); |
| } |
| |
| private FirstWant(String line, Set<String> capabilities, |
| @Nullable String agent, @Nullable String clientSID) { |
| this.line = line; |
| this.capabilities = capabilities; |
| this.agent = agent; |
| this.clientSID = clientSID; |
| } |
| |
| /** |
| * Get line |
| * |
| * @return non-capabilities part of the line. |
| */ |
| public String getLine() { |
| return line; |
| } |
| |
| /** |
| * Get capabilities |
| * |
| * @return capabilities parsed from the line as an immutable set (excluding |
| * agent and session-id). |
| */ |
| public Set<String> getCapabilities() { |
| return capabilities; |
| } |
| |
| /** |
| * Get agent |
| * |
| * @return client user agent parsed from the line. |
| */ |
| @Nullable |
| public String getAgent() { |
| return agent; |
| } |
| |
| /** |
| * Get client session-id |
| * |
| * @return client session-id parsed from the line. |
| */ |
| @Nullable |
| public String getClientSID() { |
| return clientSID; |
| } |
| } |