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- /*
- * Copyright (C) 2008, 2010 Google Inc.
- * Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com>
- * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
- * Copyright (C) 2008, 2020 Shawn O. Pearce <spearce@spearce.org> 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.COMMAND_LS_REFS;
- import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_AGENT;
- import static org.eclipse.jgit.transport.GitProtocolConstants.REF_ATTR_PEELED;
- import static org.eclipse.jgit.transport.GitProtocolConstants.REF_ATTR_SYMREF_TARGET;
- import static org.eclipse.jgit.transport.GitProtocolConstants.VERSION_1;
- import static org.eclipse.jgit.transport.GitProtocolConstants.VERSION_2;
-
- import java.io.EOFException;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.text.MessageFormat;
- import java.util.Arrays;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.HashMap;
- import java.util.HashSet;
- import java.util.Iterator;
- import java.util.LinkedHashMap;
- import java.util.Map;
- import java.util.Objects;
- import java.util.Set;
-
- import org.eclipse.jgit.annotations.NonNull;
- import org.eclipse.jgit.errors.InvalidObjectIdException;
- import org.eclipse.jgit.errors.NoRemoteRepositoryException;
- import org.eclipse.jgit.errors.PackProtocolException;
- import org.eclipse.jgit.errors.RemoteRepositoryException;
- import org.eclipse.jgit.errors.TransportException;
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.ObjectIdRef;
- import org.eclipse.jgit.lib.Ref;
- import org.eclipse.jgit.lib.Repository;
- import org.eclipse.jgit.lib.SymbolicRef;
- import org.eclipse.jgit.util.StringUtils;
- import org.eclipse.jgit.util.io.InterruptTimer;
- import org.eclipse.jgit.util.io.TimeoutInputStream;
- import org.eclipse.jgit.util.io.TimeoutOutputStream;
-
- /**
- * Base helper class for pack-based operations implementations. Provides partial
- * implementation of pack-protocol - refs advertising and capabilities support,
- * and some other helper methods.
- *
- * @see BasePackFetchConnection
- * @see BasePackPushConnection
- */
- abstract class BasePackConnection extends BaseConnection {
-
- protected static final String CAPABILITY_SYMREF_PREFIX = "symref="; //$NON-NLS-1$
-
- /** The repository this transport fetches into, or pushes out of. */
- protected final Repository local;
-
- /** Remote repository location. */
- protected final URIish uri;
-
- /** A transport connected to {@link #uri}. */
- protected final Transport transport;
-
- /** Low-level input stream, if a timeout was configured. */
- protected TimeoutInputStream timeoutIn;
-
- /** Low-level output stream, if a timeout was configured. */
- protected TimeoutOutputStream timeoutOut;
-
- /** Timer to manage {@link #timeoutIn} and {@link #timeoutOut}. */
- private InterruptTimer myTimer;
-
- /** Input stream reading from the remote. */
- protected InputStream in;
-
- /** Output stream sending to the remote. */
- protected OutputStream out;
-
- /** Packet line decoder around {@link #in}. */
- protected PacketLineIn pckIn;
-
- /** Packet line encoder around {@link #out}. */
- protected PacketLineOut pckOut;
-
- /** Send {@link PacketLineOut#end()} before closing {@link #out}? */
- protected boolean outNeedsEnd;
-
- /** True if this is a stateless RPC connection. */
- protected boolean statelessRPC;
-
- /** Capability tokens advertised by the remote side. */
- private final Map<String, String> remoteCapabilities = new HashMap<>();
-
- /** Extra objects the remote has, but which aren't offered as refs. */
- protected final Set<ObjectId> additionalHaves = new HashSet<>();
-
- private TransferConfig.ProtocolVersion protocol = TransferConfig.ProtocolVersion.V0;
-
- BasePackConnection(PackTransport packTransport) {
- transport = (Transport) packTransport;
- local = transport.local;
- uri = transport.uri;
- }
-
- TransferConfig.ProtocolVersion getProtocolVersion() {
- return protocol;
- }
-
- void setProtocolVersion(@NonNull TransferConfig.ProtocolVersion protocol) {
- this.protocol = protocol;
- }
-
- /**
- * Configure this connection with the directional pipes.
- *
- * @param myIn
- * input stream to receive data from the peer. Caller must ensure
- * the input is buffered, otherwise read performance may suffer.
- * @param myOut
- * output stream to transmit data to the peer. Caller must ensure
- * the output is buffered, otherwise write performance may
- * suffer.
- */
- protected final void init(InputStream myIn, OutputStream myOut) {
- final int timeout = transport.getTimeout();
- if (timeout > 0) {
- final Thread caller = Thread.currentThread();
- if (myTimer == null) {
- myTimer = new InterruptTimer(caller.getName() + "-Timer"); //$NON-NLS-1$
- }
- timeoutIn = new TimeoutInputStream(myIn, myTimer);
- timeoutOut = new TimeoutOutputStream(myOut, myTimer);
- timeoutIn.setTimeout(timeout * 1000);
- timeoutOut.setTimeout(timeout * 1000);
- myIn = timeoutIn;
- myOut = timeoutOut;
- }
-
- in = myIn;
- out = myOut;
-
- pckIn = new PacketLineIn(in);
- pckOut = new PacketLineOut(out);
- outNeedsEnd = true;
- }
-
- /**
- * Reads the advertised references through the initialized stream.
- * <p>
- * Subclass implementations may call this method only after setting up the
- * input and output streams with {@link #init(InputStream, OutputStream)}.
- * <p>
- * If any errors occur, this connection is automatically closed by invoking
- * {@link #close()} and the exception is wrapped (if necessary) and thrown
- * as a {@link org.eclipse.jgit.errors.TransportException}.
- *
- * @return {@code true} if the refs were read; {@code false} otherwise
- * indicating that {@link #lsRefs} must be called
- *
- * @throws org.eclipse.jgit.errors.TransportException
- * the reference list could not be scanned.
- */
- protected boolean readAdvertisedRefs() throws TransportException {
- try {
- return readAdvertisedRefsImpl();
- } catch (TransportException err) {
- close();
- throw err;
- } catch (IOException | RuntimeException err) {
- close();
- throw new TransportException(err.getMessage(), err);
- }
- }
-
- private String readLine() throws IOException {
- String line = pckIn.readString();
- if (PacketLineIn.isEnd(line)) {
- return null;
- }
- if (line.startsWith("ERR ")) { //$NON-NLS-1$
- // This is a customized remote service error.
- // Users should be informed about it.
- throw new RemoteRepositoryException(uri, line.substring(4));
- }
- return line;
- }
-
- private boolean readAdvertisedRefsImpl() throws IOException {
- final Map<String, Ref> avail = new LinkedHashMap<>();
- final Map<String, String> symRefs = new LinkedHashMap<>();
- for (boolean first = true;; first = false) {
- String line;
-
- if (first) {
- boolean isV1 = false;
- try {
- line = readLine();
- } catch (EOFException e) {
- TransportException noRepo = noRepository();
- noRepo.initCause(e);
- throw noRepo;
- }
- if (line != null && VERSION_1.equals(line)) {
- // Same as V0, except for this extra line. We shouldn't get
- // it since we never request V1.
- setProtocolVersion(TransferConfig.ProtocolVersion.V0);
- isV1 = true;
- line = readLine();
- }
- if (line == null) {
- break;
- }
- final int nul = line.indexOf('\0');
- if (nul >= 0) {
- // Protocol V0: The first line (if any) may contain
- // "hidden" capability values after a NUL byte.
- for (String capability : line.substring(nul + 1)
- .split(" ")) { //$NON-NLS-1$
- if (capability.startsWith(CAPABILITY_SYMREF_PREFIX)) {
- String[] parts = capability
- .substring(
- CAPABILITY_SYMREF_PREFIX.length())
- .split(":", 2); //$NON-NLS-1$
- if (parts.length == 2) {
- symRefs.put(parts[0], parts[1]);
- }
- } else {
- addCapability(capability);
- }
- }
- line = line.substring(0, nul);
- setProtocolVersion(TransferConfig.ProtocolVersion.V0);
- } else if (!isV1 && VERSION_2.equals(line)) {
- // Protocol V2: remaining lines are capabilities as
- // key=value pairs
- setProtocolVersion(TransferConfig.ProtocolVersion.V2);
- readCapabilitiesV2();
- // Break out here so that stateless RPC transports get a
- // chance to set up the output stream.
- return false;
- } else {
- setProtocolVersion(TransferConfig.ProtocolVersion.V0);
- }
- } else {
- line = readLine();
- if (line == null) {
- break;
- }
- }
-
- // Expecting to get a line in the form "sha1 refname"
- if (line.length() < 41 || line.charAt(40) != ' ') {
- throw invalidRefAdvertisementLine(line);
- }
- String name = line.substring(41, line.length());
- if (first && name.equals("capabilities^{}")) { //$NON-NLS-1$
- // special line from git-receive-pack (protocol V0) to show
- // capabilities when there are no refs to advertise
- continue;
- }
-
- final ObjectId id = toId(line, line.substring(0, 40));
- if (name.equals(".have")) { //$NON-NLS-1$
- additionalHaves.add(id);
- } else {
- processLineV1(name, id, avail);
- }
- }
- updateWithSymRefs(avail, symRefs);
- available(avail);
- return true;
- }
-
- /**
- * Issue a protocol V2 ls-refs command and read its response.
- *
- * @param refSpecs
- * to produce ref prefixes from if the server supports git
- * protocol V2
- * @param additionalPatterns
- * to use for ref prefixes if the server supports git protocol V2
- * @throws TransportException
- * if the command could not be run or its output not be read
- */
- protected void lsRefs(Collection<RefSpec> refSpecs,
- String... additionalPatterns) throws TransportException {
- try {
- lsRefsImpl(refSpecs, additionalPatterns);
- } catch (TransportException err) {
- close();
- throw err;
- } catch (IOException | RuntimeException err) {
- close();
- throw new TransportException(err.getMessage(), err);
- }
- }
-
- private void lsRefsImpl(Collection<RefSpec> refSpecs,
- String... additionalPatterns) throws IOException {
- pckOut.writeString("command=" + COMMAND_LS_REFS); //$NON-NLS-1$
- // Add the user-agent
- String agent = UserAgent.get();
- if (agent != null && isCapableOf(OPTION_AGENT)) {
- pckOut.writeString(OPTION_AGENT + '=' + agent);
- }
- pckOut.writeDelim();
- pckOut.writeString("peel"); //$NON-NLS-1$
- pckOut.writeString("symrefs"); //$NON-NLS-1$
- for (String refPrefix : getRefPrefixes(refSpecs, additionalPatterns)) {
- pckOut.writeString("ref-prefix " + refPrefix); //$NON-NLS-1$
- }
- pckOut.end();
- final Map<String, Ref> avail = new LinkedHashMap<>();
- final Map<String, String> symRefs = new LinkedHashMap<>();
- for (;;) {
- String line = readLine();
- if (line == null) {
- break;
- }
- // Expecting to get a line in the form "sha1 refname"
- if (line.length() < 41 || line.charAt(40) != ' ') {
- throw invalidRefAdvertisementLine(line);
- }
- String name = line.substring(41, line.length());
- final ObjectId id = toId(line, line.substring(0, 40));
- if (name.equals(".have")) { //$NON-NLS-1$
- additionalHaves.add(id);
- } else {
- processLineV2(line, id, name, avail, symRefs);
- }
- }
- updateWithSymRefs(avail, symRefs);
- available(avail);
- }
-
- private Collection<String> getRefPrefixes(Collection<RefSpec> refSpecs,
- String... additionalPatterns) {
- if (refSpecs.isEmpty() && (additionalPatterns == null
- || additionalPatterns.length == 0)) {
- return Collections.emptyList();
- }
- Set<String> patterns = new HashSet<>();
- if (additionalPatterns != null) {
- Arrays.stream(additionalPatterns).filter(Objects::nonNull)
- .forEach(patterns::add);
- }
- for (RefSpec spec : refSpecs) {
- // TODO: for now we only do protocol V2 for fetch. For push
- // RefSpecs, the logic would need to be different. (At the
- // minimum, take spec.getDestination().)
- String src = spec.getSource();
- if (ObjectId.isId(src)) {
- continue;
- }
- if (spec.isWildcard()) {
- patterns.add(src.substring(0, src.indexOf('*')));
- } else {
- patterns.add(src);
- patterns.add(Constants.R_REFS + src);
- patterns.add(Constants.R_HEADS + src);
- patterns.add(Constants.R_TAGS + src);
- }
- }
- return patterns;
- }
-
- private void readCapabilitiesV2() throws IOException {
- // In git protocol V2, capabilities are different. If it's a key-value
- // pair, the key may be a command name, and the value a space-separated
- // list of capabilities for that command. We still store it in the same
- // map as for protocol v0/v1. Protocol v2 code has to account for this.
- for (;;) {
- String line = readLine();
- if (line == null) {
- break;
- }
- addCapability(line);
- }
- }
-
- private void addCapability(String capability) {
- String parts[] = capability.split("=", 2); //$NON-NLS-1$
- if (parts.length == 2) {
- remoteCapabilities.put(parts[0], parts[1]);
- }
- remoteCapabilities.put(capability, null);
- }
-
- private ObjectId toId(String line, String value)
- throws PackProtocolException {
- try {
- return ObjectId.fromString(value);
- } catch (InvalidObjectIdException e) {
- PackProtocolException ppe = invalidRefAdvertisementLine(line);
- ppe.initCause(e);
- throw ppe;
- }
- }
-
- private void processLineV1(String name, ObjectId id, Map<String, Ref> avail)
- throws IOException {
- if (name.endsWith("^{}")) { //$NON-NLS-1$
- name = name.substring(0, name.length() - 3);
- final Ref prior = avail.get(name);
- if (prior == null) {
- throw new PackProtocolException(uri, MessageFormat.format(
- JGitText.get().advertisementCameBefore, name, name));
- }
- if (prior.getPeeledObjectId() != null) {
- throw duplicateAdvertisement(name + "^{}"); //$NON-NLS-1$
- }
- avail.put(name, new ObjectIdRef.PeeledTag(Ref.Storage.NETWORK, name,
- prior.getObjectId(), id));
- } else {
- final Ref prior = avail.put(name, new ObjectIdRef.PeeledNonTag(
- Ref.Storage.NETWORK, name, id));
- if (prior != null) {
- throw duplicateAdvertisement(name);
- }
- }
- }
-
- private void processLineV2(String line, ObjectId id, String rest,
- Map<String, Ref> avail, Map<String, String> symRefs)
- throws IOException {
- String[] parts = rest.split(" "); //$NON-NLS-1$
- String name = parts[0];
- // Two attributes possible, symref-target or peeled
- String symRefTarget = null;
- String peeled = null;
- for (int i = 1; i < parts.length; i++) {
- if (parts[i].startsWith(REF_ATTR_SYMREF_TARGET)) {
- if (symRefTarget != null) {
- throw new PackProtocolException(uri, MessageFormat.format(
- JGitText.get().duplicateRefAttribute, line));
- }
- symRefTarget = parts[i]
- .substring(REF_ATTR_SYMREF_TARGET.length());
- } else if (parts[i].startsWith(REF_ATTR_PEELED)) {
- if (peeled != null) {
- throw new PackProtocolException(uri, MessageFormat.format(
- JGitText.get().duplicateRefAttribute, line));
- }
- peeled = parts[i].substring(REF_ATTR_PEELED.length());
- }
- if (peeled != null && symRefTarget != null) {
- break;
- }
- }
- Ref idRef;
- if (peeled != null) {
- idRef = new ObjectIdRef.PeeledTag(Ref.Storage.NETWORK, name, id,
- toId(line, peeled));
- } else {
- idRef = new ObjectIdRef.PeeledNonTag(Ref.Storage.NETWORK, name, id);
- }
- Ref prior = avail.put(name, idRef);
- if (prior != null) {
- throw duplicateAdvertisement(name);
- }
- if (!StringUtils.isEmptyOrNull(symRefTarget)) {
- symRefs.put(name, symRefTarget);
- }
- }
-
- /**
- * Updates the given refMap with {@link SymbolicRef}s defined by the given
- * symRefs.
- * <p>
- * For each entry, symRef, in symRefs, whose value is a key in refMap, adds
- * a new entry to refMap with that same key and value of a new
- * {@link SymbolicRef} with source=symRef.key and
- * target=refMap.get(symRef.value), then removes that entry from symRefs.
- * <p>
- * If refMap already contains an entry for symRef.key, it is replaced.
- * </p>
- * </p>
- * <p>
- * For example, given:
- * </p>
- *
- * <pre>
- * refMap.put("refs/heads/main", ref);
- * symRefs.put("HEAD", "refs/heads/main");
- * </pre>
- *
- * then:
- *
- * <pre>
- * updateWithSymRefs(refMap, symRefs);
- * </pre>
- *
- * has the <em>effect</em> of:
- *
- * <pre>
- * refMap.put("HEAD",
- * new SymbolicRef("HEAD", refMap.get(symRefs.remove("HEAD"))))
- * </pre>
- * <p>
- * Any entry in symRefs whose value is not a key in refMap is ignored. Any
- * circular symRefs are ignored.
- * </p>
- * <p>
- * Upon completion, symRefs will contain only any unresolvable entries.
- * </p>
- *
- * @param refMap
- * a non-null, modifiable, Map to update, and the provider of
- * symref targets.
- * @param symRefs
- * a non-null, modifiable, Map of symrefs.
- * @throws NullPointerException
- * if refMap or symRefs is null
- */
- static void updateWithSymRefs(Map<String, Ref> refMap, Map<String, String> symRefs) {
- boolean haveNewRefMapEntries = !refMap.isEmpty();
- while (!symRefs.isEmpty() && haveNewRefMapEntries) {
- haveNewRefMapEntries = false;
- final Iterator<Map.Entry<String, String>> iterator = symRefs.entrySet().iterator();
- while (iterator.hasNext()) {
- final Map.Entry<String, String> symRef = iterator.next();
- if (!symRefs.containsKey(symRef.getValue())) { // defer forward reference
- final Ref r = refMap.get(symRef.getValue());
- if (r != null) {
- refMap.put(symRef.getKey(), new SymbolicRef(symRef.getKey(), r));
- haveNewRefMapEntries = true;
- iterator.remove();
- }
- }
- }
- }
- // If HEAD is still in the symRefs map here, the real ref was not
- // reported, but we know it must point to the object reported for HEAD.
- // So fill it in in the refMap.
- String headRefName = symRefs.get(Constants.HEAD);
- if (headRefName != null && !refMap.containsKey(headRefName)) {
- Ref headRef = refMap.get(Constants.HEAD);
- if (headRef != null) {
- ObjectId headObj = headRef.getObjectId();
- headRef = new ObjectIdRef.PeeledNonTag(Ref.Storage.NETWORK,
- headRefName, headObj);
- refMap.put(headRefName, headRef);
- headRef = new SymbolicRef(Constants.HEAD, headRef);
- refMap.put(Constants.HEAD, headRef);
- symRefs.remove(Constants.HEAD);
- }
- }
- }
-
- /**
- * Create an exception to indicate problems finding a remote repository. The
- * caller is expected to throw the returned exception.
- *
- * Subclasses may override this method to provide better diagnostics.
- *
- * @return a TransportException saying a repository cannot be found and
- * possibly why.
- */
- protected TransportException noRepository() {
- return new NoRemoteRepositoryException(uri, JGitText.get().notFound);
- }
-
- /**
- * Whether this option is supported
- *
- * @param option
- * option string
- * @return whether this option is supported
- */
- protected boolean isCapableOf(String option) {
- return remoteCapabilities.containsKey(option);
- }
-
- /**
- * Request capability
- *
- * @param b
- * buffer
- * @param option
- * option we want
- * @return {@code true} if the requested option is supported
- */
- protected boolean wantCapability(StringBuilder b, String option) {
- if (!isCapableOf(option))
- return false;
- b.append(' ');
- b.append(option);
- return true;
- }
-
- /**
- * Return a capability value.
- *
- * @param option
- * to get
- * @return the value stored, if any.
- */
- protected String getCapability(String option) {
- return remoteCapabilities.get(option);
- }
-
- /**
- * Add user agent capability
- *
- * @param b
- * a {@link java.lang.StringBuilder} object.
- */
- protected void addUserAgentCapability(StringBuilder b) {
- String a = UserAgent.get();
- if (a != null && remoteCapabilities.get(OPTION_AGENT) != null) {
- b.append(' ').append(OPTION_AGENT).append('=').append(a);
- }
- }
-
- /** {@inheritDoc} */
- @Override
- public String getPeerUserAgent() {
- String agent = remoteCapabilities.get(OPTION_AGENT);
- return agent != null ? agent : super.getPeerUserAgent();
- }
-
- private PackProtocolException duplicateAdvertisement(String name) {
- return new PackProtocolException(uri, MessageFormat.format(JGitText.get().duplicateAdvertisementsOf, name));
- }
-
- private PackProtocolException invalidRefAdvertisementLine(String line) {
- return new PackProtocolException(uri, MessageFormat.format(JGitText.get().invalidRefAdvertisementLine, line));
- }
-
- /** {@inheritDoc} */
- @Override
- public void close() {
- if (out != null) {
- try {
- if (outNeedsEnd) {
- outNeedsEnd = false;
- pckOut.end();
- }
- out.close();
- } catch (IOException err) {
- // Ignore any close errors.
- } finally {
- out = null;
- pckOut = null;
- }
- }
-
- if (in != null) {
- try {
- in.close();
- } catch (IOException err) {
- // Ignore any close errors.
- } finally {
- in = null;
- pckIn = null;
- }
- }
-
- if (myTimer != null) {
- try {
- myTimer.terminate();
- } finally {
- myTimer = null;
- timeoutIn = null;
- timeoutOut = null;
- }
- }
- }
-
- /**
- * Tell the peer we are disconnecting, if it cares to know.
- */
- protected void endOut() {
- if (outNeedsEnd && out != null) {
- try {
- outNeedsEnd = false;
- pckOut.end();
- } catch (IOException e) {
- try {
- out.close();
- } catch (IOException err) {
- // Ignore any close errors.
- } finally {
- out = null;
- pckOut = null;
- }
- }
- }
- }
- }
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