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chore: add support for fetching properties w/wo namespace + bitstring (…
…eclipse-edc#4108) chore: add support for fetching properties w/wo namespace + bitstring implementation
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104 changes: 104 additions & 0 deletions
104
...c/main/java/org/eclipse/edc/iam/verifiablecredentials/spi/model/statuslist/BitString.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| /* | ||
| * Copyright (c) 2024 Bayerische Motoren Werke Aktiengesellschaft (BMW AG) | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Apache License, Version 2.0 which is available at | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * Contributors: | ||
| * Bayerische Motoren Werke Aktiengesellschaft (BMW AG) - initial API and implementation | ||
| * | ||
| */ | ||
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| package org.eclipse.edc.iam.verifiablecredentials.spi.model.statuslist; | ||
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| import org.eclipse.edc.spi.result.Result; | ||
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| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.util.Base64; | ||
| import java.util.zip.GZIPInputStream; | ||
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| /** | ||
| * Representation of <a href="https://www.w3.org/TR/2023/WD-vc-status-list-20230427/#bitstring-encoding">StatusList2021Credential#bitstring</a> | ||
| */ | ||
| public class BitString { | ||
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| private final boolean leftToRightIndexing; | ||
| private final byte[] bits; | ||
| private final int bitsPerByte = 8; | ||
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| private BitString(byte[] bits, boolean leftToRightIndexing) { | ||
| this.bits = bits; | ||
| this.leftToRightIndexing = leftToRightIndexing; | ||
| } | ||
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| /** | ||
| * Checks if the bit at the input index is `1`. The input index should be in the | ||
| * bound (0-bitstring_length - 1). The default bit order is left to right, which means | ||
| * that for a byte 00000001, the bit value of that first (zeroth) index is `0` and | ||
| * the last index (seventh) is `1` | ||
| * | ||
| * @param idx The bit index to check | ||
| * @return True if `1`, false otherwise | ||
| */ | ||
| public boolean get(int idx) { | ||
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| if (idx < 0 || idx >= length()) { | ||
| throw new IllegalArgumentException("Index out of range 0-%s".formatted(length())); | ||
| } | ||
| var byteIdx = idx / bitsPerByte; | ||
| var bitIdx = idx % bitsPerByte; | ||
| var shift = leftToRightIndexing ? (7 - bitIdx) : bitIdx; | ||
| return (bits[byteIdx] & (1L << shift)) != 0; | ||
| } | ||
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| public int length() { | ||
| return bits.length * bitsPerByte; | ||
| } | ||
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| /** | ||
| * Parser configuration for {@link BitString} | ||
| */ | ||
| public static final class Parser { | ||
| private boolean leftToRightIndexing = true; | ||
| private Base64.Decoder decoder = Base64.getDecoder(); | ||
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| private Parser() { | ||
| } | ||
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| public static Parser newInstance() { | ||
| return new Parser(); | ||
| } | ||
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| public Parser leftToRightIndexing(boolean leftToRightIndexing) { | ||
| this.leftToRightIndexing = leftToRightIndexing; | ||
| return this; | ||
| } | ||
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| public Parser decoder(Base64.Decoder decoder) { | ||
| this.decoder = decoder; | ||
| return this; | ||
| } | ||
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| public Result<BitString> parse(String encodedList) { | ||
| return Result.ofThrowable(() -> decoder.decode(encodedList)) | ||
| .compose(this::unGzip) | ||
| .map(bytes -> new BitString(bytes, leftToRightIndexing)); | ||
| } | ||
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| private Result<byte[]> unGzip(byte[] bytes) { | ||
| try (var inputStream = new GZIPInputStream(new ByteArrayInputStream(bytes))) { | ||
| try (var outputStream = new ByteArrayOutputStream()) { | ||
| inputStream.transferTo(outputStream); | ||
| return Result.success(outputStream.toByteArray()); | ||
| } | ||
| } catch (IOException e) { | ||
| return Result.failure("Failed to ungzip encoded list: %s".formatted(e.getMessage())); | ||
| } | ||
| } | ||
| } | ||
| } |
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