73 lines
2.5 KiB
Java
73 lines
2.5 KiB
Java
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/*
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* Copyright 2016 Red Hat, Inc. and/or its affiliates
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* and other contributors as indicated by the @author tags.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.keycloak.theme;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.nio.charset.Charset;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import org.jboss.logging.Logger;
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/**
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* @author <a href="mailto:wadahiro@gmail.com">Hiroyuki Wada</a>
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*/
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public class PropertiesUtil {
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private static final Logger logger = Logger.getLogger(PropertiesUtil.class);
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public static final Pattern DETECT_ENCODING_PATTERN = Pattern.compile("^#\\s*encoding:\\s*([\\w.:-]+)",
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Pattern.CASE_INSENSITIVE);
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public static final Charset DEFAULT_ENCODING = Charset.forName("ISO-8859-1");
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/**
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* <p>
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* Detect file encoding from the first line of the property file. If the first line in the file doesn't contain the
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* comment with the encoding, it uses ISO-8859-1 as default encoding for backwards compatibility.
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* </p>
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* <p>
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* The specified stream is closed before this method returns.
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* </p>
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*
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* @param in The input stream
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* @return Encoding
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* @throws IOException
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*/
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public static Charset detectEncoding(InputStream in) throws IOException {
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try (BufferedReader br = new BufferedReader(new InputStreamReader(in, DEFAULT_ENCODING))) {
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String firstLine = br.readLine();
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if (firstLine != null) {
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Matcher matcher = DETECT_ENCODING_PATTERN.matcher(firstLine);
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if (matcher.find()) {
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String encoding = matcher.group(1);
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if (Charset.isSupported(encoding)) {
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return Charset.forName(encoding);
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} else {
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logger.warnv("Unsupported encoding: {0}", encoding);
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}
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}
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}
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}
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return DEFAULT_ENCODING;
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}
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}
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