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/*
* Copyright © 2018 Samuel Holland <samuel@sholland.org>
* SPDX-License-Identifier: GPL-2.0-or-later
*/
package com.wireguard.config;
import android.text.TextUtils;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.InetAddress;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* The set of valid attributes for an interface or peer in a WireGuard configuration file.
*/
enum Attribute {
ADDRESS("Address"),
ALLOWED_IPS("AllowedIPs"),
DNS("DNS"),
ENDPOINT("Endpoint"),
LISTEN_PORT("ListenPort"),
MTU("MTU"),
PERSISTENT_KEEPALIVE("PersistentKeepalive"),
PRESHARED_KEY("PresharedKey"),
PRIVATE_KEY("PrivateKey"),
PUBLIC_KEY("PublicKey");
private static final String[] EMPTY_LIST = new String[0];
private static final Map<String, Attribute> KEY_MAP;
private static final Pattern LIST_SEPARATOR_PATTERN = Pattern.compile("\\s*,\\s*");
private static final Method NUMERIC_ADDRESS_PARSER;
private static final Pattern SEPARATOR_PATTERN = Pattern.compile("\\s|=");
static {
KEY_MAP = new HashMap<>(Attribute.values().length);
for (final Attribute key : Attribute.values()) {
KEY_MAP.put(key.token, key);
}
}
static {
try {
NUMERIC_ADDRESS_PARSER = InetAddress.class.getMethod("parseNumericAddress", String.class);
} catch (final Exception e) {
throw new RuntimeException(e);
}
}
private final Pattern pattern;
private final String token;
Attribute(final String token) {
pattern = Pattern.compile(token + "\\s*=\\s*(\\S.*)");
this.token = token;
}
public static <T> String iterableToString(final Iterable<T> iterable) {
return TextUtils.join(", ", iterable);
}
public static Attribute match(final CharSequence line) {
return KEY_MAP.get(SEPARATOR_PATTERN.split(line)[0]);
}
public static InetAddress parseIPString(final String address) {
if (address == null || address.isEmpty())
throw new IllegalArgumentException("Empty address");
try {
return (InetAddress) NUMERIC_ADDRESS_PARSER.invoke(null, address);
} catch (final IllegalAccessException e) {
throw new RuntimeException(e);
} catch (final InvocationTargetException e) {
if (e.getCause() instanceof IllegalArgumentException)
throw (IllegalArgumentException) e.getCause();
else
throw new IllegalArgumentException(e.getCause());
}
}
public static String[] stringToList(final String string) {
if (string == null)
return EMPTY_LIST;
return LIST_SEPARATOR_PATTERN.split(string.trim());
}
public String composeWith(final Object value) {
return String.format("%s = %s%n", token, value);
}
public String composeWith(final int value) {
return String.format(Locale.getDefault(), "%s = %d%n", token, value);
}
public <T> String composeWith(final Iterable<T> value) {
return String.format("%s = %s%n", token, iterableToString(value));
}
public String parse(final CharSequence line) {
final Matcher matcher = pattern.matcher(line);
return matcher.matches() ? matcher.group(1) : null;
}
public String[] parseList(final CharSequence line) {
final Matcher matcher = pattern.matcher(line);
return matcher.matches() ? stringToList(matcher.group(1)) : null;
}
}
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