io.warp10.script.functions.RUNNERNONCE.java Source code

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Here is the source code for io.warp10.script.functions.RUNNERNONCE.java

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//
//   Copyright 2016  Cityzen Data
//
//   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 io.warp10.script.functions;

import io.warp10.WarpDist;
import io.warp10.crypto.KeyStore;
import io.warp10.crypto.OrderPreservingBase64;
import io.warp10.script.NamedWarpScriptFunction;
import io.warp10.script.WarpScriptException;
import io.warp10.script.WarpScriptStack;
import io.warp10.script.WarpScriptStackFunction;

import com.geoxp.oss.CryptoHelper;
import com.google.common.base.Charsets;
import com.google.common.primitives.Longs;

/**
 * Extract the content of a Runner Nonce
 */
public class RUNNERNONCE extends NamedWarpScriptFunction implements WarpScriptStackFunction {

    private byte[] runnerPSK;

    public RUNNERNONCE(String name) {
        super(name);
    }

    @Override
    public Object apply(WarpScriptStack stack) throws WarpScriptException {
        Object o = stack.pop();

        if (!(o instanceof String)) {
            throw new WarpScriptException(getName() + " expects a String.");
        }

        synchronized (RUNNERNONCE.class) {
            if (null == runnerPSK) {
                try {
                    runnerPSK = WarpDist.getKeyStore().getKey(KeyStore.AES_RUNNER_PSK);
                } catch (Throwable t) {
                    // Catch NoClassDefFoundError
                }
            }
        }

        if (null != runnerPSK) {
            // Unwrap the blob
            byte[] wrapped = OrderPreservingBase64.decode(o.toString().getBytes(Charsets.US_ASCII));
            byte[] raw = CryptoHelper.unwrapBlob(runnerPSK, wrapped);

            if (null == raw) {
                throw new WarpScriptException(getName() + " invalid runner nonce.");
            }
            stack.push(Longs.fromByteArray(raw));
        } else {
            stack.push(null);
        }

        return stack;
    }
}