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/*
* Copyright (C) 2014 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 libcore.net.http;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import java.nio.charset.StandardCharsets;
import java.nio.charset.UnsupportedCharsetException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* @hide
*/
public class ResponseUtils {
/**
* Returns the response charset of a HTTP response based on the {@code Content-Type} of
* the response (see RFC 7230). If the {@code Content-Type} header is missing or invalid,
* the response is assumed to be encoded as {@code UTF-8}. Note that a charset usually
* makes sense only for {@code "text/plain"} and other "text based" responses.
*
* @throws IllegalCharsetNameException if the response specified charset is illegal.
* @throws UnsupportedCharsetException if the response specified charset is unsupported.
*/
public static Charset responseCharset(String contentTypeHeader)
throws IllegalCharsetNameException, UnsupportedCharsetException {
Charset responseCharset = StandardCharsets.UTF_8;
if (contentTypeHeader != null) {
Map<String, String> contentTypeParams = parseContentTypeParameters(contentTypeHeader);
String charsetParameter = contentTypeParams.get("charset");
if (charsetParameter != null) {
responseCharset = Charset.forName(charsetParameter);
}
}
return responseCharset;
}
/**
* Parse content-type parameters. The format of this header is roughly :
* {@code type/subtype; param1=value1; param2=value2 ...} where each of the
* parameters are optional. Parsing is lenient, malformed parameters are ignored.
*
* Parameter keys & values are trimmed of whitespace and keys are converted to
* lower case.
*/
private static Map<String, String> parseContentTypeParameters(String contentTypeHeader) {
Map<String, String> parameters = Collections.EMPTY_MAP;
String[] fields = contentTypeHeader.split(";");
if (fields.length > 1) {
parameters = new HashMap<>();
// Ignore the first element in the array (the type/subtype).
for (int i = 1; i < fields.length; ++i) {
final String parameter = fields[i];
if (!parameter.isEmpty()) {
final String[] components = parameter.split("=");
if (components.length != 2) {
continue;
}
final String key = components[0].trim().toLowerCase();
final String value = components[1].trim();
if (key.isEmpty() || value.isEmpty()) {
continue;
}
parameters.put(key, value);
}
}
}
return parameters;
}
}
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