com.spotify.sshagentproxy.DefaultIdentity Maven / Gradle / Ivy

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A Java library that talks to the local ssh-agent.
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/*-
 * -\-\-
 * ssh-agent-proxy
 * --
 * Copyright (C) 2016 Spotify AB
 * --
 * 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.
 * -/-/-
 */

/**
 * Copyright (c) 2015 Spotify AB.
 *
 * 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 com.spotify.sshagentproxy;

import com.google.common.base.Objects;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.util.Iterator;

public class DefaultIdentity implements Identity {

  private static final String RSA_LABEL = "ssh-rsa";
  private static final String DSS_LABEL = "ssh-dss";

  private final String keyFormat;
  private final PublicKey publicKey;
  private final String comment;
  private final byte[] keyBlob;

  private DefaultIdentity(final String keyFormat, final PublicKey publicKey, final String comment,
                          final byte[] keyBlob) {
    this.keyFormat = keyFormat;
    this.publicKey = publicKey;
    this.comment = comment;
    this.keyBlob = keyBlob;
  }

  public static Identity from(final byte[] keyBlob, final String comment)
      throws NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException {
    final Iterator keyBlobIterator = new ByteIterator(keyBlob);
    final String keyFormat = new String(keyBlobIterator.next());

    final PublicKey publicKey;
    switch (keyFormat) {
      case RSA_LABEL:
        publicKey = Rsa.from(keyBlob);
        break;
      case DSS_LABEL:
      default:
        throw new UnsupportedOperationException(String.format(
            "Got unsupported key format '%s'. Skipping.", keyFormat));
    }

    keyBlobIterator.next();
    return new DefaultIdentity(keyFormat, publicKey, comment, keyBlob);
  }

  @Override
  public String getKeyFormat() {
    return keyFormat;
  }

  public PublicKey getPublicKey() {
    return publicKey;
  }

  public String getComment() {
    return comment;
  }

  @Override
  public byte[] getKeyBlob() {
    return keyBlob;
  }

  @Override
  public String toString() {
    return Objects.toStringHelper(this)
        .add("keyFormat", keyFormat)
        .add("publicKey", publicKey)
        .add("comment", comment)
        .toString();
  }

  @Override
  public boolean equals(final Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }

    final DefaultIdentity that = (DefaultIdentity) obj;

    if (keyFormat != null ? !keyFormat.equals(that.keyFormat) : that.keyFormat != null) {
      return false;
    }
    if (publicKey != null ? !publicKey.equals(that.publicKey) : that.publicKey != null) {
      return false;
    }
    return !(comment != null ? !comment.equals(that.comment) : that.comment != null);

  }

  @Override
  public int hashCode() {
    int result = keyFormat != null ? keyFormat.hashCode() : 0;
    result = 31 * result + (publicKey != null ? publicKey.hashCode() : 0);
    result = 31 * result + (comment != null ? comment.hashCode() : 0);
    return result;
  }
}