151 lines
5.3 KiB
Java
151 lines
5.3 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util;
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import io.netty.util.internal.StringUtil;
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import java.net.IDN;
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import java.util.Collections;
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import java.util.LinkedHashMap;
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import java.util.Locale;
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import java.util.Map;
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import static io.netty.util.internal.ObjectUtil.checkNotNull;
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import static io.netty.util.internal.StringUtil.commonSuffixOfLength;
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/**
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* Maps a domain name to its associated value object.
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* <p>
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* DNS wildcard is supported as hostname, so you can use {@code *.netty.io} to match both {@code netty.io}
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* and {@code downloads.netty.io}.
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* </p>
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*/
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public class DomainNameMapping<V> implements Mapping<String, V> {
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final V defaultValue;
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private final Map<String, V> map;
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private final Map<String, V> unmodifiableMap;
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/**
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* Creates a default, order-sensitive mapping. If your hostnames are in conflict, the mapping
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* will choose the one you add first.
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*
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* @param defaultValue the default value for {@link #map(String)} to return when nothing matches the input
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* @deprecated use {@link DomainNameMappingBuilder} to create and fill the mapping instead
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*/
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@Deprecated
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public DomainNameMapping(V defaultValue) {
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this(4, defaultValue);
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}
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/**
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* Creates a default, order-sensitive mapping. If your hostnames are in conflict, the mapping
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* will choose the one you add first.
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*
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* @param initialCapacity initial capacity for the internal map
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* @param defaultValue the default value for {@link #map(String)} to return when nothing matches the input
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* @deprecated use {@link DomainNameMappingBuilder} to create and fill the mapping instead
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*/
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@Deprecated
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public DomainNameMapping(int initialCapacity, V defaultValue) {
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this(new LinkedHashMap<String, V>(initialCapacity), defaultValue);
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}
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DomainNameMapping(Map<String, V> map, V defaultValue) {
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this.defaultValue = checkNotNull(defaultValue, "defaultValue");
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this.map = map;
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unmodifiableMap = map != null ? Collections.unmodifiableMap(map)
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: null;
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}
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/**
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* Adds a mapping that maps the specified (optionally wildcard) host name to the specified output value.
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* <p>
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* <a href="http://en.wikipedia.org/wiki/Wildcard_DNS_record">DNS wildcard</a> is supported as hostname.
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* For example, you can use {@code *.netty.io} to match {@code netty.io} and {@code downloads.netty.io}.
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* </p>
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*
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* @param hostname the host name (optionally wildcard)
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* @param output the output value that will be returned by {@link #map(String)} when the specified host name
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* matches the specified input host name
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* @deprecated use {@link DomainNameMappingBuilder} to create and fill the mapping instead
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*/
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@Deprecated
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public DomainNameMapping<V> add(String hostname, V output) {
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map.put(normalizeHostname(checkNotNull(hostname, "hostname")), checkNotNull(output, "output"));
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return this;
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}
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/**
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* Simple function to match <a href="http://en.wikipedia.org/wiki/Wildcard_DNS_record">DNS wildcard</a>.
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*/
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static boolean matches(String template, String hostName) {
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if (template.startsWith("*.")) {
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return template.regionMatches(2, hostName, 0, hostName.length())
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|| commonSuffixOfLength(hostName, template, template.length() - 1);
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}
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return template.equals(hostName);
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}
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/**
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* IDNA ASCII conversion and case normalization
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*/
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static String normalizeHostname(String hostname) {
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if (needsNormalization(hostname)) {
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hostname = IDN.toASCII(hostname, IDN.ALLOW_UNASSIGNED);
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}
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return hostname.toLowerCase(Locale.US);
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}
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private static boolean needsNormalization(String hostname) {
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final int length = hostname.length();
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for (int i = 0; i < length; i++) {
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int c = hostname.charAt(i);
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if (c > 0x7F) {
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return true;
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}
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}
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return false;
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}
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@Override
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public V map(String hostname) {
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if (hostname != null) {
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hostname = normalizeHostname(hostname);
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for (Map.Entry<String, V> entry : map.entrySet()) {
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if (matches(entry.getKey(), hostname)) {
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return entry.getValue();
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}
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}
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}
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return defaultValue;
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}
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/**
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* Returns a read-only {@link Map} of the domain mapping patterns and their associated value objects.
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*/
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public Map<String, V> asMap() {
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return unmodifiableMap;
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}
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@Override
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public String toString() {
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return StringUtil.simpleClassName(this) + "(default: " + defaultValue + ", map: " + map + ')';
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}
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}
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