co.cask.cdap.security.auth.AccessTokenTransformer.java Source code

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Here is the source code for co.cask.cdap.security.auth.AccessTokenTransformer.java

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/*
 * Copyright  2014 Cask Data, 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 co.cask.cdap.security.auth;

import co.cask.cdap.common.io.Codec;
import com.google.inject.Inject;
import org.apache.commons.codec.binary.Base64;

import java.io.IOException;

/**
 * It takes the access token and transforms it to Access Token Identifier.
 */
public class AccessTokenTransformer {
    private final Codec<AccessToken> accessTokenCodec;
    private final Codec<AccessTokenIdentifier> accessTokenIdentifierCodec;

    @Inject
    public AccessTokenTransformer(Codec<AccessToken> accessTokenCodec,
            Codec<AccessTokenIdentifier> accessTokenIdentifierCodec) {
        this.accessTokenCodec = accessTokenCodec;
        this.accessTokenIdentifierCodec = accessTokenIdentifierCodec;
    }

    /**
     *
     * @param accessToken is the access token from Authorization header in HTTP Request
     * @return the serialized access token identifer
     * @throws IOException
     */
    public AccessTokenIdentifierPair transform(String accessToken) throws IOException {
        byte[] decodedAccessToken = Base64.decodeBase64(accessToken);
        AccessToken accessTokenObj = accessTokenCodec.decode(decodedAccessToken);
        AccessTokenIdentifier accessTokenIdentifierObj = accessTokenObj.getIdentifier();
        byte[] encodedAccessTokenIdentifier = accessTokenIdentifierCodec.encode(accessTokenIdentifierObj);
        return new AccessTokenIdentifierPair(Base64.encodeBase64String(encodedAccessTokenIdentifier).trim(),
                accessTokenIdentifierObj);
    }

    /**
     * Access token identifier pair that has marshalled and unmarshalled
     * access token object
     */
    public class AccessTokenIdentifierPair {
        private final String accessTokenIdentifierStr;
        private final AccessTokenIdentifier accessTokenIdentifierObj;

        public AccessTokenIdentifierPair(String accessTokenIdentifierStr,
                AccessTokenIdentifier accessTokenIdentifierObj) {
            this.accessTokenIdentifierObj = accessTokenIdentifierObj;
            this.accessTokenIdentifierStr = accessTokenIdentifierStr;
        }

        public String getAccessTokenIdentifierStr() {
            return accessTokenIdentifierStr;
        }

        public AccessTokenIdentifier getAccessTokenIdentifierObj() {
            return accessTokenIdentifierObj;
        }

        @Override
        public String toString() {
            return accessTokenIdentifierStr;
        }
    }

}