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/*
* Copyright (C) 2014 Dominik Schürmann <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.sufficientlysecure.keychain.util;
import android.content.Context;
import org.sufficientlysecure.keychain.keyimport.HkpKeyserver;
import org.sufficientlysecure.keychain.keyimport.ImportKeysListEntry;
import org.sufficientlysecure.keychain.keyimport.Keyserver;
import org.sufficientlysecure.keychain.keyimport.ParcelableKeyRing;
import org.sufficientlysecure.keychain.operations.results.ImportKeyResult;
import org.sufficientlysecure.keychain.service.ImportKeyringParcel;
import org.sufficientlysecure.keychain.ui.base.CryptoOperationHelper;
import java.net.Proxy;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
public class EmailKeyHelper {
// TODO: Make this not require a proxy in it's constructor, redesign when it is to be used
// to import keys, simply use CryptoOperationHelper with this callback
public abstract class ImportContactKeysCallback
implements CryptoOperationHelper.Callback<ImportKeyringParcel, ImportKeyResult> {
private ArrayList<ParcelableKeyRing> mKeyList;
private String mKeyserver;
public ImportContactKeysCallback(Context context, String keyserver, Proxy proxy) {
this(context, new ContactHelper(context).getContactMails(), keyserver, proxy);
}
public ImportContactKeysCallback(Context context, List<String> mails, String keyserver,
Proxy proxy) {
Set<ImportKeysListEntry> entries = new HashSet<>();
for (String mail : mails) {
entries.addAll(getEmailKeys(context, mail, proxy));
}
// Put them in a list and import
ArrayList<ParcelableKeyRing> keys = new ArrayList<>(entries.size());
for (ImportKeysListEntry entry : entries) {
keys.add(new ParcelableKeyRing(entry.getFingerprintHex(), entry.getKeyIdHex()));
}
mKeyList = keys;
mKeyserver = keyserver;
}
@Override
public ImportKeyringParcel createOperationInput() {
return new ImportKeyringParcel(mKeyList, mKeyserver);
}
}
public static Set<ImportKeysListEntry> getEmailKeys(Context context, String mail, Proxy proxy) {
Set<ImportKeysListEntry> keys = new HashSet<>();
// Try _hkp._tcp SRV record first
String[] mailparts = mail.split("@");
if (mailparts.length == 2) {
HkpKeyserver hkp = HkpKeyserver.resolve(mailparts[1], proxy);
if (hkp != null) {
keys.addAll(getEmailKeys(mail, hkp));
}
}
if (keys.isEmpty()) {
// Most users don't have the SRV record, so ask a default server as well
String server = Preferences.getPreferences(context).getPreferredKeyserver();
if (server != null) {
HkpKeyserver hkp = new HkpKeyserver(server, proxy);
keys.addAll(getEmailKeys(mail, hkp));
}
}
return keys;
}
public static List<ImportKeysListEntry> getEmailKeys(String mail, Keyserver keyServer) {
Set<ImportKeysListEntry> keys = new HashSet<>();
try {
for (ImportKeysListEntry key : keyServer.search(mail)) {
if (key.isRevoked() || key.isExpired()) continue;
for (String userId : key.getUserIds()) {
if (userId.toLowerCase().contains(mail.toLowerCase(Locale.ENGLISH))) {
keys.add(key);
}
}
}
} catch (Keyserver.CloudSearchFailureException ignored) {
}
return new ArrayList<>(keys);
}
}
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