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Tink is a small cryptographic library that provides a safe, simple, agile and fast way to accomplish some common cryptographic tasks.

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// Copyright 2021 Google LLC
//
// 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.google.crypto.tink.jwt;

import com.google.crypto.tink.internal.KeysetHandleInterface;
import com.google.crypto.tink.internal.MonitoringClient;
import com.google.crypto.tink.internal.MonitoringUtil;
import com.google.crypto.tink.internal.MutableMonitoringRegistry;
import com.google.crypto.tink.internal.MutablePrimitiveRegistry;
import com.google.crypto.tink.internal.PrimitiveSet;
import com.google.crypto.tink.internal.PrimitiveWrapper;
import com.google.errorprone.annotations.Immutable;
import java.security.GeneralSecurityException;

/**
 * The implementation of {@code PrimitiveWrapper}.
 *
 * The returned primitive works with a keyset (rather than a single key). To sign a message, it
 * uses the primary key in the keyset, and prepends to the signature a certain prefix associated
 * with the primary key.
 */
class JwtPublicKeySignWrapper implements PrimitiveWrapper {

  private static final JwtPublicKeySignWrapper WRAPPER = new JwtPublicKeySignWrapper();

  JwtPublicKeySignWrapper() {}

  @Immutable
  private static class WrappedJwtPublicKeySign implements JwtPublicKeySign {
    private final JwtPublicKeySign primary;
    private final int primaryKeyId;

    @SuppressWarnings("Immutable")
    private final MonitoringClient.Logger logger;

    public WrappedJwtPublicKeySign(final PrimitiveSet primitives)
        throws GeneralSecurityException {
      KeysetHandleInterface keysetHandle = primitives.getKeysetHandle();
      this.primary = primitives.getPrimitiveForEntry(keysetHandle.getPrimary());
      this.primaryKeyId = keysetHandle.getPrimary().getId();
      if (!primitives.getAnnotations().isEmpty()) {
        MonitoringClient client = MutableMonitoringRegistry.globalInstance().getMonitoringClient();
        this.logger =
            client.createLogger(keysetHandle, primitives.getAnnotations(), "jwtsign", "sign");
      } else {
        this.logger = MonitoringUtil.DO_NOTHING_LOGGER;
      }
    }

    @Override
    public String signAndEncode(RawJwt token) throws GeneralSecurityException {
      try {
        String output = primary.signAndEncode(token);
        logger.log(primaryKeyId, 1);
        return output;
      } catch (GeneralSecurityException e) {
        logger.logFailure();
        throw e;
      }
    }
  }

  @Override
  public JwtPublicKeySign wrap(final PrimitiveSet primitives)
      throws GeneralSecurityException {
    return new WrappedJwtPublicKeySign(primitives);
  }

  @Override
  public Class getPrimitiveClass() {
    return JwtPublicKeySign.class;
  }

  @Override
  public Class getInputPrimitiveClass() {
    return JwtPublicKeySign.class;
  }

  /**
   * Register the wrapper within the registry.
   *
   * This is required for calls to {@link Keyset.getPrimitive} with a {@link JwtPublicKeySign}
   * argument.
   */
  public static void register() throws GeneralSecurityException {
    MutablePrimitiveRegistry.globalInstance().registerPrimitiveWrapper(WRAPPER);
  }
}