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package org.sufficientlysecure.keychain.pgp.linked;
import android.content.Context;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.operations.results.LinkedVerifyResult;
import org.sufficientlysecure.keychain.operations.results.OperationResult.LogType;
import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog;
import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
import org.sufficientlysecure.keychain.util.Log;
import java.net.URI;
import java.util.HashMap;
import java.util.Map.Entry;
import java.util.Set;
import java.util.regex.Matcher;
public abstract class LinkedCookieResource extends LinkedResource {
protected LinkedCookieResource(Set<String> flags, HashMap<String, String> params, URI uri) {
super(flags, params, uri);
}
public URI toUri () {
StringBuilder b = new StringBuilder();
b.append("pgpid+cookie:");
// add flags
if (mFlags != null) {
boolean first = true;
for (String flag : mFlags) {
if (!first) {
b.append(";");
}
first = false;
b.append(flag);
}
}
// add parameters
if (mParams != null) {
boolean first = true;
for (Entry<String, String> stringStringEntry : mParams.entrySet()) {
if (!first) {
b.append(";");
}
first = false;
b.append(stringStringEntry.getKey()).append("=").append(stringStringEntry.getValue());
}
}
b.append("@");
b.append(mSubUri);
return URI.create(b.toString());
}
public URI getSubUri () {
return mSubUri;
}
public static String generate (Context context, byte[] fingerprint, int nonce) {
return String.format("[Verifying my PGP key: openpgp4fpr:%s#%08x]",
KeyFormattingUtils.convertFingerprintToHex(fingerprint), nonce);
}
public static String generatePreview () {
return "[Verifying my PGP key: openpgp4fpr:0x…]";
}
public LinkedVerifyResult verify(byte[] fingerprint, int nonce) {
OperationLog log = new OperationLog();
log.add(LogType.MSG_LV, 0);
// Try to fetch resource. Logs for itself
String res = fetchResource(log, 1);
if (res == null) {
// if this is null, an error was recorded in fetchResource above
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
Log.d(Constants.TAG, "Resource data: '" + res + "'");
return verifyString(log, 1, res, nonce, fingerprint);
}
protected abstract String fetchResource (OperationLog log, int indent);
protected Matcher matchResource (OperationLog log, int indent, String res) {
return magicPattern.matcher(res);
}
protected LinkedVerifyResult verifyString (OperationLog log, int indent,
String res,
int nonce, byte[] fingerprint) {
log.add(LogType.MSG_LV_MATCH, indent);
Matcher match = matchResource(log, indent+1, res);
if (!match.find()) {
log.add(LogType.MSG_LV_MATCH_ERROR, 2);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
String candidateFp = match.group(1).toLowerCase();
try {
int nonceCandidate = Integer.parseInt(match.group(2).toLowerCase(), 16);
if (nonce != nonceCandidate) {
log.add(LogType.MSG_LV_NONCE_ERROR, indent);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
} catch (NumberFormatException e) {
log.add(LogType.MSG_LV_NONCE_ERROR, indent);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
String fp = KeyFormattingUtils.convertFingerprintToHex(fingerprint);
if (!fp.equals(candidateFp)) {
log.add(LogType.MSG_LV_FP_ERROR, indent);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
log.add(LogType.MSG_LV_FP_OK, indent);
log.add(LogType.MSG_LV_NONCE_OK, indent);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_OK, log);
}
}
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