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/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.net.module.util;
import android.text.TextUtils;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Collection of network common utilities.
*
* @hide
*/
public final class ProxyUtils {
public static final int PROXY_VALID = 0;
public static final int PROXY_HOSTNAME_EMPTY = 1;
public static final int PROXY_HOSTNAME_INVALID = 2;
public static final int PROXY_PORT_EMPTY = 3;
public static final int PROXY_PORT_INVALID = 4;
public static final int PROXY_EXCLLIST_INVALID = 5;
// Hostname / IP REGEX validation
// Matches blank input, ips, and domain names
private static final String NAME_IP_REGEX =
"[a-zA-Z0-9]+(\\-[a-zA-Z0-9]+)*(\\.[a-zA-Z0-9]+(\\-[a-zA-Z0-9]+)*)*";
private static final Pattern HOSTNAME_PATTERN;
private static final String HOSTNAME_REGEXP = "^$|^" + NAME_IP_REGEX + "$";
private static final Pattern EXCLLIST_PATTERN;
private static final String EXCL_REGEX =
"[a-zA-Z0-9*]+(\\-[a-zA-Z0-9*]+)*(\\.[a-zA-Z0-9*]+(\\-[a-zA-Z0-9*]+)*)*";
private static final String EXCLLIST_REGEXP = "^$|^" + EXCL_REGEX + "(," + EXCL_REGEX + ")*$";
static {
HOSTNAME_PATTERN = Pattern.compile(HOSTNAME_REGEXP);
EXCLLIST_PATTERN = Pattern.compile(EXCLLIST_REGEXP);
}
/** Converts exclusion list from String to List. */
public static List<String> exclusionStringAsList(String exclusionList) {
if (exclusionList == null) {
return Collections.emptyList();
}
return Arrays.asList(exclusionList.toLowerCase(Locale.ROOT).split(","));
}
/** Converts exclusion list from List to string */
public static String exclusionListAsString(String[] exclusionList) {
if (exclusionList == null) {
return "";
}
return TextUtils.join(",", exclusionList);
}
/**
* Validate syntax of hostname, port and exclusion list entries
*/
public static int validate(String hostname, String port, String exclList) {
Matcher match = HOSTNAME_PATTERN.matcher(hostname);
Matcher listMatch = EXCLLIST_PATTERN.matcher(exclList);
if (!match.matches()) return PROXY_HOSTNAME_INVALID;
if (!listMatch.matches()) return PROXY_EXCLLIST_INVALID;
if (hostname.length() > 0 && port.length() == 0) return PROXY_PORT_EMPTY;
if (port.length() > 0) {
if (hostname.length() == 0) return PROXY_HOSTNAME_EMPTY;
int portVal = -1;
try {
portVal = Integer.parseInt(port);
} catch (NumberFormatException ex) {
return PROXY_PORT_INVALID;
}
if (portVal <= 0 || portVal > 0xFFFF) return PROXY_PORT_INVALID;
}
return PROXY_VALID;
}
}
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