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The ProximaX IPFS Java API is a Java library for interacting IPFS server.
package io.ipfs.api.cbor;
import io.ipfs.cid.*;
import io.ipfs.multiaddr.*;
import io.ipfs.multihash.*;
import java.io.*;
import java.util.*;
import java.util.stream.*;
public interface CborObject {
void serialize(CborEncoder encoder);
default byte[] toByteArray() {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
CborEncoder encoder = new CborEncoder(bout);
serialize(encoder);
return bout.toByteArray();
}
int LINK_TAG = 42;
static CborObject fromByteArray(byte[] cbor) {
return deserialize(new CborDecoder(new ByteArrayInputStream(cbor)));
}
static CborObject deserialize(CborDecoder decoder) {
try {
CborType type = decoder.peekType();
switch (type.getMajorType()) {
case CborConstants.TYPE_TEXT_STRING:
return new CborString(decoder.readTextString());
case CborConstants.TYPE_BYTE_STRING:
return new CborByteArray(decoder.readByteString());
case CborConstants.TYPE_UNSIGNED_INTEGER:
return new CborLong(decoder.readInt());
case CborConstants.TYPE_NEGATIVE_INTEGER:
return new CborLong(decoder.readInt());
case CborConstants.TYPE_FLOAT_SIMPLE:
if (type.getAdditionalInfo() == CborConstants.NULL) {
decoder.readNull();
return new CborNull();
}
if (type.getAdditionalInfo() == CborConstants.TRUE) {
decoder.readBoolean();
return new CborBoolean(true);
}
if (type.getAdditionalInfo() == CborConstants.FALSE) {
decoder.readBoolean();
return new CborBoolean(false);
}
throw new IllegalStateException("Unimplemented simple type! " + type.getAdditionalInfo());
case CborConstants.TYPE_MAP: {
long nValues = decoder.readMapLength();
SortedMap result = new TreeMap<>();
for (long i=0; i < nValues; i++) {
CborObject key = deserialize(decoder);
CborObject value = deserialize(decoder);
result.put(key, value);
}
return new CborMap(result);
}
case CborConstants.TYPE_ARRAY:
long nItems = decoder.readArrayLength();
List res = new ArrayList<>((int) nItems);
for (long i=0; i < nItems; i++)
res.add(deserialize(decoder));
return new CborList(res);
case CborConstants.TYPE_TAG:
long tag = decoder.readTag();
if (tag == LINK_TAG) {
CborObject value = deserialize(decoder);
if (value instanceof CborString)
return new CborMerkleLink(Cid.decode(((CborString) value).value));
if (value instanceof CborByteArray) {
byte[] bytes = ((CborByteArray) value).value;
if (bytes[0] == 0) // multibase for binary
return new CborMerkleLink(Cid.cast(Arrays.copyOfRange(bytes, 1, bytes.length)));
throw new IllegalStateException("Unknown Multibase decoding Merkle link: " + bytes[0]);
}
throw new IllegalStateException("Invalid type for merkle link: " + value);
}
throw new IllegalStateException("Unknown TAG in CBOR: " + type.getAdditionalInfo());
default:
throw new IllegalStateException("Unimplemented cbor type: " + type);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
final class CborMap implements CborObject {
public final SortedMap values;
public CborMap(SortedMap values) {
this.values = values;
}
public static CborMap build(Map values) {
SortedMap transformed = values.entrySet()
.stream()
.collect(Collectors.toMap(
e -> new CborString(e.getKey()),
e -> e.getValue(),
(a, b) -> a, TreeMap::new));
return new CborMap(transformed);
}
@Override
public void serialize(CborEncoder encoder) {
try {
encoder.writeMapStart(values.size());
for (Map.Entry entry : values.entrySet()) {
entry.getKey().serialize(encoder);
entry.getValue().serialize(encoder);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CborMap cborMap = (CborMap) o;
return values != null ? values.equals(cborMap.values) : cborMap.values == null;
}
@Override
public int hashCode() {
return values != null ? values.hashCode() : 0;
}
}
final class CborMerkleLink implements CborObject {
public final Multihash target;
public CborMerkleLink(Multihash target) {
this.target = target;
}
@Override
public void serialize(CborEncoder encoder) {
try {
encoder.writeTag(LINK_TAG);
byte[] cid = target.toBytes();
byte[] withMultibaseHeader = new byte[cid.length + 1];
System.arraycopy(cid, 0, withMultibaseHeader, 1, cid.length);
encoder.writeByteString(withMultibaseHeader);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CborMerkleLink that = (CborMerkleLink) o;
return target != null ? target.equals(that.target) : that.target == null;
}
@Override
public int hashCode() {
return target != null ? target.hashCode() : 0;
}
}
final class CborList implements CborObject {
public final List value;
public CborList(List value) {
this.value = value;
}
@Override
public void serialize(CborEncoder encoder) {
try {
encoder.writeArrayStart(value.size());
for (CborObject object : value) {
object.serialize(encoder);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CborList cborList = (CborList) o;
return value != null ? value.equals(cborList.value) : cborList.value == null;
}
@Override
public int hashCode() {
return value != null ? value.hashCode() : 0;
}
}
final class CborBoolean implements CborObject {
public final boolean value;
public CborBoolean(boolean value) {
this.value = value;
}
@Override
public void serialize(CborEncoder encoder) {
try {
encoder.writeBoolean(value);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CborBoolean that = (CborBoolean) o;
return value == that.value;
}
@Override
public int hashCode() {
return (value ? 1 : 0);
}
@Override
public String toString() {
return "CborBoolean{" +
value +
'}';
}
}
final class CborByteArray implements CborObject, Comparable {
public final byte[] value;
public CborByteArray(byte[] value) {
this.value = value;
}
@Override
public int compareTo(CborByteArray other) {
return compare(value, other.value);
}
public static int compare(byte[] a, byte[] b)
{
for (int i=0; i < Math.min(a.length, b.length); i++)
if (a[i] != b[i])
return a[i] & 0xff - b[i] & 0xff;
return 0;
}
@Override
public void serialize(CborEncoder encoder) {
try {
encoder.writeByteString(value);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CborByteArray that = (CborByteArray) o;
return Arrays.equals(value, that.value);
}
@Override
public int hashCode() {
return Arrays.hashCode(value);
}
}
final class CborString implements CborObject, Comparable {
public final String value;
public CborString(String value) {
this.value = value;
}
@Override
public int compareTo(CborString cborString) {
int lenDiff = value.length() - cborString.value.length();
if (lenDiff != 0)
return lenDiff;
return value.compareTo(cborString.value);
}
@Override
public void serialize(CborEncoder encoder) {
try {
encoder.writeTextString(value);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CborString that = (CborString) o;
return value.equals(that.value);
}
@Override
public int hashCode() {
return value.hashCode();
}
@Override
public String toString() {
return "CborString{\"" +
value +
"\"}";
}
}
final class CborLong implements CborObject, Comparable {
public final long value;
public CborLong(long value) {
this.value = value;
}
@Override
public int compareTo(CborLong other) {
return Long.compare(value, other.value);
}
@Override
public void serialize(CborEncoder encoder) {
try {
encoder.writeInt(value);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CborLong cborLong = (CborLong) o;
return value == cborLong.value;
}
@Override
public int hashCode() {
return (int) (value ^ (value >>> 32));
}
@Override
public String toString() {
return "CborLong{" +
value +
'}';
}
}
final class CborNull implements CborObject, Comparable {
public CborNull() {}
@Override
public int compareTo(CborNull cborNull) {
return 0;
}
@Override
public void serialize(CborEncoder encoder) {
try {
encoder.writeNull();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
return true;
}
@Override
public int hashCode() {
return 0;
}
@Override
public String toString() {
return "CborNull{}";
}
}
}