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package org.sufficientlysecure.keychain.linked.resources;
import android.content.Context;
import android.support.annotation.DrawableRes;
import android.support.annotation.StringRes;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog;
import org.sufficientlysecure.keychain.linked.LinkedTokenResource;
import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
import java.net.URI;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import de.measite.minidns.Client;
import de.measite.minidns.DNSMessage;
import de.measite.minidns.Question;
import de.measite.minidns.Record;
import de.measite.minidns.Record.CLASS;
import de.measite.minidns.Record.TYPE;
import de.measite.minidns.record.TXT;
public class DnsResource extends LinkedTokenResource {
final static Pattern magicPattern =
Pattern.compile("openpgpid\\+token=([a-zA-Z0-9]+)(?:#|;)([a-zA-Z0-9]+)");
String mFqdn;
CLASS mClass;
TYPE mType;
DnsResource(Set<String> flags, HashMap<String, String> params, URI uri,
String fqdn, CLASS clazz, TYPE type) {
super(flags, params, uri);
mFqdn = fqdn;
mClass = clazz;
mType = type;
}
public static String generateText(byte[] fingerprint) {
return String.format("openpgp4fpr=%s",
KeyFormattingUtils.convertFingerprintToHex(fingerprint));
}
public static DnsResource createNew (String domain) {
HashSet<String> flags = new HashSet<>();
HashMap<String,String> params = new HashMap<>();
URI uri = URI.create("dns:" + domain + "?TYPE=TXT");
return create(flags, params, uri);
}
public static DnsResource create(Set<String> flags, HashMap<String,String> params, URI uri) {
if ( ! ("dns".equals(uri.getScheme())
&& (flags == null || flags.isEmpty())
&& (params == null || params.isEmpty()))) {
return null;
}
//
String spec = uri.getSchemeSpecificPart();
// If there are // at the beginning, this includes an authority - we don't support those!
if (spec.startsWith("//")) {
return null;
}
String[] pieces = spec.split("\\?", 2);
// In either case, part before a ? is the fqdn
String fqdn = pieces[0];
// There may be a query part
/*
if (pieces.length > 1) {
// parse CLASS and TYPE query paramters
}
*/
CLASS clazz = CLASS.IN;
TYPE type = TYPE.TXT;
return new DnsResource(flags, params, uri, fqdn, clazz, type);
}
@SuppressWarnings("unused")
public String getFqdn() {
return mFqdn;
}
@Override
protected String fetchResource (Context context, OperationLog log, int indent) {
Client c = new Client();
DNSMessage msg = c.query(new Question(mFqdn, mType, mClass));
Record aw = msg.getAnswers()[0];
TXT txt = (TXT) aw.getPayload();
return txt.getText().toLowerCase();
}
@Override
protected Matcher matchResource(OperationLog log, int indent, String res) {
return magicPattern.matcher(res);
}
@Override
public @StringRes
int getVerifiedText(boolean isSecret) {
return isSecret ? R.string.linked_verified_secret_dns : R.string.linked_verified_dns;
}
@Override
public @DrawableRes int getDisplayIcon() {
return R.drawable.linked_dns;
}
@Override
public String getDisplayTitle(Context context) {
return context.getString(R.string.linked_title_dns);
}
@Override
public String getDisplayComment(Context context) {
return mFqdn;
}
}
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