org.ajoberstar.grgit.auth.TransportOpUtil.groovy Maven / Gradle / Ivy

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/*
 * Copyright 2012-2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.ajoberstar.grgit.auth

import java.awt.GraphicsEnvironment

import org.ajoberstar.grgit.Credentials

import org.eclipse.jgit.api.TransportCommand
import org.eclipse.jgit.awtui.AwtCredentialsProvider
import org.eclipse.jgit.transport.CredentialsProvider
import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider

import org.slf4j.Logger
import org.slf4j.LoggerFactory

/**
 * Utility class that allows a JGit {@code TransportCommand} to be configured
 * to use additional authentication options.
 */
final class TransportOpUtil {
    private static final Logger logger = LoggerFactory.getLogger(TransportOpUtil)

    private TransportOpUtil() {
        throw new AssertionError('This class cannot be instantiated.')
    }

    /**
     * Configures the given transport command with the given credentials.
     * @param cmd the command to configure
     * @param creds the hardcoded credentials to use, if not {@code null}
     */
    static void configure(TransportCommand cmd, Credentials creds) {
        AuthConfig config = AuthConfig.fromSystemProperties()
        logger.info('The following authentication options are allowed (though they may not be available): {}', config.allowed)
        cmd.credentialsProvider = determineCredentialsProvider(config, creds)
        cmd.transportConfigCallback = new JschAgentProxyConfigCallback(config)
    }

    private static CredentialsProvider determineCredentialsProvider(AuthConfig config, Credentials creds) {
        Credentials systemCreds = config.hardcodedCreds
        if (config.allows(AuthConfig.Option.HARDCODED) && creds?.username) {
            logger.info('using hardcoded credentials provided programmatically')
            return new UsernamePasswordCredentialsProvider(creds.username, creds.password)
        } else if (config.allows(AuthConfig.Option.HARDCODED) && systemCreds) {
            logger.info('using hardcoded credentials from system properties')
            return new UsernamePasswordCredentialsProvider(systemCreds.username, systemCreds.password)
        } else if (config.allows(AuthConfig.Option.INTERACTIVE) && !GraphicsEnvironment.isHeadless()) {
            logger.info('using interactive credentials, if needed')
            return new AwtCredentialsProvider()
        } else {
            return null
        }
    }
}