Java tutorial
/* * Copyright (C) 2013-2014 Dominik Schrmann <dominik@dominikschuermann.de> * * 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.thialfihar.android.apg.ui; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.app.NavUtils; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarActivity; import android.text.format.DateFormat; import android.view.MenuItem; import android.view.View; import android.widget.TextView; import org.spongycastle.bcpg.SignatureSubpacket; import org.spongycastle.bcpg.SignatureSubpacketTags; import org.spongycastle.bcpg.sig.RevocationReason; import org.spongycastle.openpgp.PGPException; import org.spongycastle.openpgp.PGPKeyRing; import org.spongycastle.openpgp.PGPSignature; import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentVerifierBuilderProvider; import org.thialfihar.android.apg.Constants; import org.thialfihar.android.apg.R; import org.thialfihar.android.apg.pgp.PgpConversionHelper; import org.thialfihar.android.apg.pgp.PgpKeyHelper; import org.thialfihar.android.apg.provider.ApgContract.Certs; import org.thialfihar.android.apg.provider.ApgContract.KeyRings; import org.thialfihar.android.apg.provider.ApgContract; import org.thialfihar.android.apg.provider.ProviderHelper; import org.thialfihar.android.apg.util.Log; import java.security.SignatureException; import java.util.Date; public class ViewCertActivity extends ActionBarActivity implements LoaderManager.LoaderCallbacks<Cursor> { // These are the rows that we will retrieve. static final String[] PROJECTION = new String[] { Certs.MASTER_KEY_ID, Certs.USER_ID, Certs.TYPE, Certs.CREATION, Certs.KEY_ID_CERTIFIER, Certs.SIGNER_UID, Certs.DATA, }; private static final int INDEX_MASTER_KEY_ID = 0; private static final int INDEX_USER_ID = 1; private static final int INDEX_TYPE = 2; private static final int INDEX_CREATION = 3; private static final int INDEX_KEY_ID_CERTIFIER = 4; private static final int INDEX_SIGNER_UID = 5; private static final int INDEX_DATA = 6; private Uri mDataUri; private long mCertifierKeyId; private TextView mSigneeKey, mSigneeUid, mAlgorithm, mType, mReason, mCreation; private TextView mCertifierKey, mCertifierUid, mStatus; private View mRowReason; private View mViewCertifierButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); setContentView(R.layout.view_cert_activity); mStatus = (TextView) findViewById(R.id.status); mSigneeKey = (TextView) findViewById(R.id.signee_key); mSigneeUid = (TextView) findViewById(R.id.signee_uid); mAlgorithm = (TextView) findViewById(R.id.algorithm); mType = (TextView) findViewById(R.id.signature_type); mReason = (TextView) findViewById(R.id.reason); mCreation = (TextView) findViewById(R.id.creation); mCertifierKey = (TextView) findViewById(R.id.signer_key_id); mCertifierUid = (TextView) findViewById(R.id.signer_uid); mRowReason = findViewById(R.id.row_reason); mViewCertifierButton = findViewById(R.id.view_cert_view_cert_key); mDataUri = getIntent().getData(); if (mDataUri == null) { Log.e(Constants.TAG, "Intent data missing. Should be Uri of key!"); finish(); return; } getSupportLoaderManager().initLoader(0, null, this); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { // Now create and return a CursorLoader that will take care of // creating a Cursor for the data being displayed. return new CursorLoader(this, mDataUri, PROJECTION, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { if (data.moveToFirst()) { String signeeKey = PgpKeyHelper.convertKeyIdToHex(data.getLong(INDEX_MASTER_KEY_ID)); mSigneeKey.setText(signeeKey); String signeeUid = data.getString(INDEX_USER_ID); mSigneeUid.setText(signeeUid); Date creationDate = new Date(data.getLong(INDEX_CREATION) * 1000); mCreation.setText(DateFormat.getDateFormat(getApplicationContext()).format(creationDate)); mCertifierKeyId = data.getLong(INDEX_KEY_ID_CERTIFIER); String certifierKey = PgpKeyHelper.convertKeyIdToHex(mCertifierKeyId); mCertifierKey.setText(certifierKey); String certifierUid = data.getString(INDEX_SIGNER_UID); if (certifierUid != null) { mCertifierUid.setText(certifierUid); } else { mCertifierUid.setText(R.string.unknown_uid); } PGPSignature sig = PgpConversionHelper.BytesToPGPSignature(data.getBlob(INDEX_DATA)); try { ProviderHelper providerHelper = new ProviderHelper(this); PGPKeyRing signeeRing = providerHelper.getPGPKeyRing(ApgContract.KeyRingData .buildPublicKeyRingUri(Long.toString(data.getLong(INDEX_MASTER_KEY_ID)))); PGPKeyRing signerRing = providerHelper.getPGPKeyRing( ApgContract.KeyRingData.buildPublicKeyRingUri(Long.toString(sig.getKeyID()))); try { sig.init(new JcaPGPContentVerifierBuilderProvider() .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME), signerRing.getPublicKey()); if (sig.verifyCertification(signeeUid, signeeRing.getPublicKey())) { mStatus.setText(R.string.cert_verify_ok); mStatus.setTextColor(getResources().getColor(R.color.bbutton_success)); } else { mStatus.setText(R.string.cert_verify_failed); mStatus.setTextColor(getResources().getColor(R.color.alert)); } } catch (SignatureException e) { mStatus.setText(R.string.cert_verify_error); mStatus.setTextColor(getResources().getColor(R.color.alert)); } catch (PGPException e) { mStatus.setText(R.string.cert_verify_error); mStatus.setTextColor(getResources().getColor(R.color.alert)); } } catch (ProviderHelper.NotFoundException e) { mStatus.setText(R.string.cert_verify_unavailable); mStatus.setTextColor(getResources().getColor(R.color.black)); } String algorithmStr = PgpKeyHelper.getAlgorithmInfo(this, sig.getKeyAlgorithm(), 0); mAlgorithm.setText(algorithmStr); mRowReason.setVisibility(View.GONE); switch (data.getInt(INDEX_TYPE)) { case PGPSignature.DEFAULT_CERTIFICATION: mType.setText(R.string.cert_default); break; case PGPSignature.NO_CERTIFICATION: mType.setText(R.string.cert_none); break; case PGPSignature.CASUAL_CERTIFICATION: mType.setText(R.string.cert_casual); break; case PGPSignature.POSITIVE_CERTIFICATION: mType.setText(R.string.cert_positive); break; case PGPSignature.CERTIFICATION_REVOCATION: { mType.setText(R.string.cert_revoke); if (sig.getHashedSubPackets().hasSubpacket(SignatureSubpacketTags.REVOCATION_REASON)) { SignatureSubpacket p = sig.getHashedSubPackets() .getSubpacket(SignatureSubpacketTags.REVOCATION_REASON); // For some reason, this is missing in SignatureSubpacketInputStream:146 if (!(p instanceof RevocationReason)) { p = new RevocationReason(false, p.getData()); } String reason = ((RevocationReason) p).getRevocationDescription(); mReason.setText(reason); mRowReason.setVisibility(View.VISIBLE); } break; } } } // can't do this before the data is initialized mViewCertifierButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent viewIntent = new Intent(ViewCertActivity.this, ViewKeyActivity.class); try { ProviderHelper providerHelper = new ProviderHelper(ViewCertActivity.this); long signerMasterKeyId = providerHelper.getMasterKeyId( KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(Long.toString(mCertifierKeyId))); viewIntent.setData(KeyRings.buildGenericKeyRingUri(Long.toString(signerMasterKeyId))); startActivity(viewIntent); } catch (ProviderHelper.NotFoundException e) { // TODO notify user of this, maybe offer download? Log.e(Constants.TAG, "key not found!", e); } } }); } @Override public void onLoaderReset(Loader<Cursor> loader) { } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: { Intent viewIntent = NavUtils.getParentActivityIntent(this); viewIntent.setData(KeyRings.buildGenericKeyRingUri(mDataUri)); NavUtils.navigateUpTo(this, viewIntent); return true; } } return super.onOptionsItemSelected(item); } }