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/*
* ============LICENSE_START====================================
* DCAEGEN2-SERVICES-SDK
* =========================================================
* Copyright (C) 2019 Nokia. All rights reserved.
* =========================================================
* 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.
* ============LICENSE_END=====================================
*/
package org.onap.dcaegen2.services.sdk.security;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.CharBuffer;
final class CharsFromStreamReader {
public static final int END_OF_STREAM = -1;
private final int maxLength;
CharsFromStreamReader(int maxLength) {
this.maxLength = maxLength;
}
CharSequence readPasswordFromStdIn() throws IOException {
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in))) {
return readPassword(bufferedReader);
}
}
CharSequence readPassword(BufferedReader bufferedReader) throws IOException {
final CharBuffer charBuffer = CharBuffer.allocate(maxLength);
if (readAllChars(charBuffer, bufferedReader)) {
charBuffer.flip();
return charBuffer.asReadOnlyBuffer();
} else {
throw new IOException(
"Input exceeds maximum supported length of " + maxLength + " characters");
}
}
private boolean readAllChars(CharBuffer charBuffer, BufferedReader bufferedReader) throws IOException {
int readChars = 0;
while (readChars != END_OF_STREAM && charBuffer.remaining() > 0) {
readChars = bufferedReader.read(charBuffer);
}
// true when all characters were read
return readChars == -1;
}
}
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