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/*
* Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
* Copyright (C) 2014 Vincent Breitmoser <v.breitmoser@mugenguild.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.provider;
import android.database.Cursor;
import android.net.Uri;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.pgp.CanonicalizedSecretKey.SecretKeyType;
import org.sufficientlysecure.keychain.pgp.KeyRing;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
import org.sufficientlysecure.keychain.provider.KeychainContract.Keys;
import org.sufficientlysecure.keychain.provider.ProviderHelper.NotFoundException;
import org.sufficientlysecure.keychain.util.Log;
/**
* This implementation of KeyRing provides a cached view of PublicKeyRing
* objects based on database queries exclusively.
* <p/>
* This class should be used where only few points of data but no actual
* cryptographic operations are required about a PublicKeyRing which is already
* in the database. This happens commonly in UI code, where parsing of a PGP
* key for examination would be a very expensive operation.
* <p/>
* Each getter method is implemented using a more or less expensive database
* query, while object construction is (almost) free. A common pattern is
* mProviderHelper.getCachedKeyRing(uri).getterMethod()
* <p/>
* TODO Ensure that the values returned here always match the ones returned by
* the parsed KeyRing!
*/
public class CachedPublicKeyRing extends KeyRing {
final ProviderHelper mProviderHelper;
final Uri mUri;
public CachedPublicKeyRing(ProviderHelper providerHelper, Uri uri) {
mProviderHelper = providerHelper;
mUri = uri;
}
@Override
public long getMasterKeyId() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeychainContract.KeyRings.MASTER_KEY_ID, ProviderHelper.FIELD_TYPE_INTEGER);
return (Long) data;
}
/**
* Find the master key id related to a given query. The id will either be extracted from the
* query, which should work for all specific /key_rings/ queries, or will be queried if it can't.
*/
public long extractOrGetMasterKeyId() throws NotFoundException {
// try extracting from the uri first
String firstSegment = mUri.getPathSegments().get(1);
if (!firstSegment.equals("find")) try {
return Long.parseLong(firstSegment);
} catch (NumberFormatException e) {
// didn't work? oh well.
Log.d(Constants.TAG, "Couldn't get masterKeyId from URI, querying...");
}
return getMasterKeyId();
}
public byte[] getFingerprint() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeychainContract.KeyRings.FINGERPRINT, ProviderHelper.FIELD_TYPE_BLOB);
return (byte[]) data;
}
@Override
public String getPrimaryUserId() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeychainContract.KeyRings.USER_ID,
ProviderHelper.FIELD_TYPE_STRING);
return (String) data;
}
public String getPrimaryUserIdWithFallback() throws NotFoundException {
return getPrimaryUserId();
}
@Override
public boolean isRevoked() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeychainContract.KeyRings.IS_REVOKED,
ProviderHelper.FIELD_TYPE_INTEGER);
return (Long) data > 0;
}
@Override
public boolean canCertify() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeychainContract.KeyRings.HAS_CERTIFY,
ProviderHelper.FIELD_TYPE_NULL);
return !((Boolean) data);
}
@Override
public long getEncryptId() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeyRings.HAS_ENCRYPT,
ProviderHelper.FIELD_TYPE_INTEGER);
return (Long) data;
}
@Override
public boolean hasEncrypt() throws NotFoundException {
return getEncryptId() != 0;
}
/**
* Returns the key id which should be used for signing.
* <p/>
* This method returns keys which are actually available (ie. secret available, and not stripped,
* revoked, or expired), hence only works on keyrings where a secret key is available!
*/
public long getSecretSignId() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeyRings.HAS_SIGN,
ProviderHelper.FIELD_TYPE_INTEGER);
return (Long) data;
}
@Override
public int getVerified() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeychainContract.KeyRings.VERIFIED,
ProviderHelper.FIELD_TYPE_INTEGER);
return (Integer) data;
}
public boolean hasAnySecret() throws NotFoundException {
Object data = mProviderHelper.getGenericData(mUri,
KeychainContract.KeyRings.HAS_ANY_SECRET,
ProviderHelper.FIELD_TYPE_INTEGER);
return (Long) data > 0;
}
private Cursor getSubkeys() throws NotFoundException {
Uri keysUri = KeychainContract.Keys.buildKeysUri(extractOrGetMasterKeyId());
return mProviderHelper.getContentResolver().query(keysUri, null, null, null, null);
}
public SecretKeyType getSecretKeyType(long keyId) throws NotFoundException {
Object data = mProviderHelper.getGenericData(Keys.buildKeysUri(mUri),
KeyRings.HAS_SECRET,
ProviderHelper.FIELD_TYPE_INTEGER,
KeyRings.KEY_ID + " = " + Long.toString(keyId));
return SecretKeyType.fromNum(((Long) data).intValue());
}
}
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