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/*
* Copyright (C) 2024 Thomas Wolf <twolf@apache.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.lib;
import java.text.MessageFormat;
import java.util.EnumMap;
import java.util.Map;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import java.util.concurrent.ConcurrentHashMap;
import org.eclipse.jgit.annotations.NonNull;
import org.eclipse.jgit.internal.JGitText;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Manages the available signers.
*
* @since 7.0
*/
public final class Signers {
private static final Logger LOG = LoggerFactory.getLogger(Signers.class);
private static final Map<GpgConfig.GpgFormat, SignerFactory> SIGNER_FACTORIES = loadSigners();
private static final Map<GpgConfig.GpgFormat, Signer> SIGNERS = new ConcurrentHashMap<>();
private static Map<GpgConfig.GpgFormat, SignerFactory> loadSigners() {
Map<GpgConfig.GpgFormat, SignerFactory> result = new EnumMap<>(
GpgConfig.GpgFormat.class);
try {
for (SignerFactory factory : ServiceLoader
.load(SignerFactory.class)) {
GpgConfig.GpgFormat format = factory.getType();
SignerFactory existing = result.get(format);
if (existing != null) {
LOG.warn("{}", //$NON-NLS-1$
MessageFormat.format(
JGitText.get().signatureServiceConflict,
"SignerFactory", format, //$NON-NLS-1$
existing.getClass().getCanonicalName(),
factory.getClass().getCanonicalName()));
} else {
result.put(format, factory);
}
}
} catch (ServiceConfigurationError e) {
LOG.error(e.getMessage(), e);
}
return result;
}
private Signers() {
// No instantiation
}
/**
* Retrieves a {@link Signer} that can produce signatures of the given type
* {@code format}.
*
* @param format
* {@link GpgConfig.GpgFormat} the signer must support
* @return a {@link Signer}, or {@code null} if none is available
*/
public static Signer get(@NonNull GpgConfig.GpgFormat format) {
return SIGNERS.computeIfAbsent(format, f -> {
SignerFactory factory = SIGNER_FACTORIES.get(format);
if (factory == null) {
return null;
}
return factory.create();
});
}
/**
* Sets a specific signer to use for a specific signature type.
*
* @param format
* signature type to set the {@code signer} for
* @param signer
* the {@link Signer} to use for signatures of type
* {@code format}; if {@code null}, a default implementation, if
* available, may be used.
*/
public static void set(@NonNull GpgConfig.GpgFormat format, Signer signer) {
if (signer == null) {
SIGNERS.remove(format);
} else {
SIGNERS.put(format, signer);
}
}
}
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