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package net.robotmedia.billing.security;

import android.content.Context;
import android.provider.Settings;
import net.robotmedia.billing.model.Transaction;
import net.robotmedia.billing.utils.BillingBase64StringDecoder;
import net.robotmedia.billing.utils.BillingBase64StringEncoder;
import net.robotmedia.billing.utils.Installation;
import org.solovyev.android.security.Security;
import org.solovyev.common.security.*;
import org.solovyev.common.text.StringDecoder;
import org.solovyev.common.text.StringEncoder;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * User: serso
 * Date: 2/10/13
 * Time: 6:52 PM
 */
public final class BillingSecurity {

	private BillingSecurity() {
		throw new AssertionError();
	}

	@Nonnull
	private static Cipherer newTransactionObfuscator(@Nonnull byte[] initialVector, @Nullable String securityPrefix) {
		final Cipherer byteCipherer = Security.newAndroidAesByteCipherer(initialVector);
		Cipherer stringCipherer = TypedCipherer.newInstance(byteCipherer, StringDecoder.getInstance(), StringEncoder.getInstance(), BillingBase64StringDecoder.getInstance(), BillingBase64StringEncoder.getInstance());

		if (securityPrefix != null) {
			stringCipherer = PrefixStringObfuscator.newInstance(securityPrefix, stringCipherer);
		}

		return TransactionObfuscator.newInstance(stringCipherer);
	}

	@Nonnull
	public static SecurityService getObfuscationSecurityService(byte[] initialVector, @Nullable String securityPrefix) {
		return Security.newSecurityService(newTransactionObfuscator(initialVector, securityPrefix), Security.newAndroidAesSecretKeyProvider(), Security.newAndroidSaltGenerator(), getHashProvider());
	}

	@Nonnull
	private static HashProvider getHashProvider() {
		final HashProvider hashProvider = org.solovyev.android.security.Security.newAndroidSha512ByteHashProvider();
		return TypedHashProvider.newByteHashCodeInstance(hashProvider);
	}

	@Nonnull
	public static String generatePassword(@Nonnull Context context) {
		final String installationId = Installation.id(context);
		final String deviceId = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.ANDROID_ID);
		return installationId + deviceId + context.getPackageName();
	}
}