com.google.api.client.auth.oauth.OAuthHmacSigner Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of google-api-client Show documentation

Google API Client Library for Java. Supports Java 5 (or higher) desktop (SE) and web (EE), Android, and Google App Engine.

There is a newer version: 1.4.1-beta

Show newest version

/*
 * Copyright (c) 2010 Google Inc.
 * 
 * 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.api.client.auth.oauth;

import com.google.api.client.auth.HmacSha;

import java.security.GeneralSecurityException;

/**
 * OAuth {@code "HMAC-SHA1"} signature method.
 * 
 * @since 1.0
 * @author Yaniv Inbar
 */
public final class OAuthHmacSigner implements OAuthSigner {

  /** Client-shared secret or {@code null} for none. */
  public String clientSharedSecret;

  /** Token-shared secret or {@code null} for none. */
  public String tokenSharedSecret;

  public String getSignatureMethod() {
    return "HMAC-SHA1";
  }

  public String computeSignature(String signatureBaseString)
      throws GeneralSecurityException {
    StringBuilder keyBuf = new StringBuilder();
    String clientSharedSecret = this.clientSharedSecret;
    if (clientSharedSecret != null) {
      keyBuf.append(OAuthParameters.escape(clientSharedSecret));
    }
    keyBuf.append('&');
    String tokenSharedSecret = this.tokenSharedSecret;
    if (tokenSharedSecret != null) {
      keyBuf.append(OAuthParameters.escape(tokenSharedSecret));
    }
    return HmacSha.sign(keyBuf.toString(), signatureBaseString);
  }
}