SHiNE-server/shine-server-blockchain/src/main/java/blockchain/body/ConnectionBody.java
AidarKC 9f1ca37977 23 01 25
Сделал более понятный названия у интерфейса  BodyHasLine

(всё работает)
2026-01-23 13:05:29 +03:00

259 lines
11 KiB
Java
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package blockchain.body;
import blockchain.MsgSubType;
import utils.blockchain.BlockchainNameUtil;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Objects;
/**
* ConnectionBody — type=3, ver=1 (в заголовке блока).
*
* subType (в заголовке блока) как MsgSubType:
* FRIEND=10, UNFRIEND=11
* CONTACT=20, UNCONTACT=21
* FOLLOW=30, UNFOLLOW=31
*
* bodyBytes (BigEndian), новый формат (toLogin НЕ ХРАНИМ):
* [4] lineCode
* [4] prevLineNumber
* [32] prevLineHash32
* [4] thisLineNumber
*
* [1] toBlockchainNameLen (uint8)
* [N] toBlockchainName UTF-8
* [4] toBlockGlobalNumber (int32)
* [32] toBlockHash32 (raw 32 bytes)
*
* toLogin вычисляется автоматически из toBlockchainName:
* toLogin = BlockchainNameUtil.loginFromBlockchainName(toBlockchainName)
*/
/**
* =========================================================================
* ПРАВИЛО TARGET/ROOT ДЛЯ КАНАЛОВ И СВЯЗЕЙ (важно для подписок/друзей/контактов)
* =========================================================================
*
* Термины:
* - ROOT линии/канала = блок, который "начинает" линию:
* * для канала "0" root = HEADER (blockNumber=0)
* * для канала "X" root = CREATE_CHANNEL (blockNumber этого блока)
*
* 1) СВЯЗИ МЕЖДУ ПОЛЬЗОВАТЕЛЯМИ (CONNECTION_*):
* FRIEND / CONTACT -> цель ВСЕГДА HEADER пользователя:
* toBlockNumber = 0
* toBlockHash32 = hash32(HEADER цели)
*
* 2) ПОДПИСКИ НА КОНТЕНТ (FOLLOW/SUBSCRIBE):
* FOLLOW пользователя (в целом) -> цель = ROOT дефолтного канала "0" (то есть HEADER):
* toBlockNumber = 0
* toBlockHash32 = hash32(HEADER цели)
*
* FOLLOW/подписка на конкретный канал пользователя ->
* цель = ROOT этого канала:
* - канал "0": toBlockNumber=0, toBlockHash32=hash32(HEADER)
* - канал "X": toBlockNumber=blockNumber(CREATE_CHANNEL),
* toBlockHash32=hash32(CREATE_CHANNEL)
*
* 3) ЗАПРЕТЫ ВАЛИДАЦИИ (желательно на сервере/в БД):
* - CONNECTION_FRIEND/CONTACT не могут ссылаться на не-HEADER (toBlockNumber != 0 запрещено).
* - FOLLOW на канал "X" не может ссылаться на произвольный пост внутри канала:
* разрешено ТОЛЬКО на ROOT (HEADER или CREATE_CHANNEL).
*
* Зачем так:
* - связи и подписки всегда стабильны и не ломаются при новых постах,
* - один понятный инвариант: "подписка всегда указывает на root линии".
* =========================================================================
*/
public final class ConnectionBody implements BodyRecord, BodyHasTarget, BodyHasLine {
public static final short TYPE = 3;
public static final short VER = 1;
public static final int KEY = ((TYPE & 0xFFFF) << 16) | (VER & 0xFFFF);
public final short subType; // из header
public final short version; // из header
// line
public final int lineCode;
public final int prevLineNumber;
public final byte[] prevLineHash32;
public final int thisLineNumber;
// payload
public final String toBlockchainName;
public final int toBlockGlobalNumber;
public final byte[] toBlockHash32;
public ConnectionBody(short subType, short version, byte[] bodyBytes) {
Objects.requireNonNull(bodyBytes, "bodyBytes == null");
this.subType = subType;
this.version = version;
if ((this.version & 0xFFFF) != (VER & 0xFFFF)) {
throw new IllegalArgumentException("ConnectionBody version must be 1, got=" + (this.version & 0xFFFF));
}
if (!isValidSubType(this.subType)) {
throw new IllegalArgumentException("Bad connection subType: " + (this.subType & 0xFFFF));
}
// минимум:
// lineCode(4) + line(4+32+4) + toBchLen[1]+toBch[1] + global[4] + hash[32]
if (bodyBytes.length < 4 + (4 + 32 + 4) + 1 + 1 + 4 + 32) {
throw new IllegalArgumentException("ConnectionBody too short");
}
ByteBuffer bb = ByteBuffer.wrap(bodyBytes).order(ByteOrder.BIG_ENDIAN);
this.lineCode = bb.getInt();
this.prevLineNumber = bb.getInt();
this.prevLineHash32 = new byte[32];
bb.get(this.prevLineHash32);
this.thisLineNumber = bb.getInt();
int bchLen = Byte.toUnsignedInt(bb.get());
if (bchLen <= 0) throw new IllegalArgumentException("toBlockchainNameLen is 0");
if (bb.remaining() < bchLen + 4 + 32) throw new IllegalArgumentException("Connection payload too short");
byte[] bchBytes = new byte[bchLen];
bb.get(bchBytes);
this.toBlockchainName = new String(bchBytes, StandardCharsets.UTF_8);
this.toBlockGlobalNumber = bb.getInt();
this.toBlockHash32 = new byte[32];
bb.get(this.toBlockHash32);
if (bb.remaining() != 0) throw new IllegalArgumentException("Unexpected tail bytes, remaining=" + bb.remaining());
}
public ConnectionBody(int lineCode,
int prevLineNumber,
byte[] prevLineHash32,
int thisLineNumber,
short subType,
String toBlockchainName,
int toBlockGlobalNumber,
byte[] toBlockHash32) {
Objects.requireNonNull(toBlockchainName, "toBlockchainName == null");
Objects.requireNonNull(toBlockHash32, "toBlockHash32 == null");
if (lineCode < 0) throw new IllegalArgumentException("lineCode < 0");
if (!isValidSubType(subType)) throw new IllegalArgumentException("Bad connection subType: " + (subType & 0xFFFF));
if (toBlockchainName.isBlank()) throw new IllegalArgumentException("toBlockchainName is blank");
// Железное правило формата: bchName -> login + "-NNN"
if (BlockchainNameUtil.loginFromBlockchainName(toBlockchainName) == null) {
throw new IllegalArgumentException("toBlockchainName must match login+\"-NNN\": " + toBlockchainName);
}
if (toBlockGlobalNumber < 0) throw new IllegalArgumentException("toBlockGlobalNumber < 0");
if (toBlockHash32.length != 32) throw new IllegalArgumentException("toBlockHash32 != 32");
this.lineCode = lineCode;
this.prevLineNumber = prevLineNumber;
this.prevLineHash32 = (prevLineHash32 == null ? new byte[32] : Arrays.copyOf(prevLineHash32, 32));
this.thisLineNumber = thisLineNumber;
this.subType = subType;
this.version = VER;
this.toBlockchainName = toBlockchainName;
this.toBlockGlobalNumber = toBlockGlobalNumber;
this.toBlockHash32 = Arrays.copyOf(toBlockHash32, 32);
}
private static boolean isValidSubType(short st) {
int v = st & 0xFFFF;
return v == (MsgSubType.CONNECTION_FRIEND & 0xFFFF)
|| v == (MsgSubType.CONNECTION_UNFRIEND & 0xFFFF)
|| v == (MsgSubType.CONNECTION_CONTACT & 0xFFFF)
|| v == (MsgSubType.CONNECTION_UNCONTACT & 0xFFFF)
|| v == (MsgSubType.CONNECTION_FOLLOW & 0xFFFF)
|| v == (MsgSubType.CONNECTION_UNFOLLOW & 0xFFFF);
}
@Override
public ConnectionBody check() {
if (lineCode < 0) throw new IllegalArgumentException("lineCode < 0");
if (!isValidSubType(subType)) throw new IllegalArgumentException("Bad connection subType: " + (subType & 0xFFFF));
// line rule (как было)
if (prevLineNumber == -1) {
if (!isAllZero32(prevLineHash32)) throw new IllegalArgumentException("prevLineHash32 must be zero when prevLineNumber=-1");
if (thisLineNumber != -1) throw new IllegalArgumentException("thisLineNumber must be -1 when prevLineNumber=-1");
} else {
if (prevLineHash32 == null || prevLineHash32.length != 32) throw new IllegalArgumentException("prevLineHash32 invalid");
}
if (toBlockchainName == null || toBlockchainName.isBlank())
throw new IllegalArgumentException("toBlockchainName is blank");
// гарантируем вычислимый toLogin (иначе target “битый” по стандарту)
if (BlockchainNameUtil.loginFromBlockchainName(toBlockchainName) == null)
throw new IllegalArgumentException("toBlockchainName must match login+\"-NNN\": " + toBlockchainName);
if (toBlockGlobalNumber < 0) throw new IllegalArgumentException("toBlockGlobalNumber < 0");
if (toBlockHash32 == null || toBlockHash32.length != 32) throw new IllegalArgumentException("toBlockHash32 invalid");
return this;
}
@Override
public byte[] toBytes() {
byte[] bchBytes = toBlockchainName.getBytes(StandardCharsets.UTF_8);
if (bchBytes.length == 0 || bchBytes.length > 255)
throw new IllegalArgumentException("toBlockchainName utf8 len must be 1..255");
if (toBlockHash32 == null || toBlockHash32.length != 32)
throw new IllegalArgumentException("toBlockHash32 != 32");
int cap = 4 + (4 + 32 + 4)
+ 1 + bchBytes.length
+ 4 + 32;
ByteBuffer bb = ByteBuffer.allocate(cap).order(ByteOrder.BIG_ENDIAN);
bb.putInt(lineCode);
bb.putInt(prevLineNumber);
bb.put(prevLineHash32 == null ? new byte[32] : Arrays.copyOf(prevLineHash32, 32));
bb.putInt(thisLineNumber);
bb.put((byte) bchBytes.length);
bb.put(bchBytes);
bb.putInt(toBlockGlobalNumber);
bb.put(toBlockHash32);
return bb.array();
}
private static boolean isAllZero32(byte[] b) {
if (b == null || b.length != 32) return true;
for (int i = 0; i < 32; i++) if (b[i] != 0) return false;
return true;
}
/* ====================== BodyHasLine ====================== */
@Override public int lineCode() { return lineCode; }
@Override public int prevLineBlockGlobalNumber() { return prevLineNumber; }
@Override public byte[] prevLineBlockHash32() { return prevLineHash32 == null ? null : Arrays.copyOf(prevLineHash32, 32); }
@Override public int lineSeq() { return thisLineNumber; }
/* ====================== BodyHasTarget ===================== */
@Override public String toBchName() { return toBlockchainName; }
@Override public Integer toBlockGlobalNumber() { return toBlockGlobalNumber; }
@Override public byte[] toBlockHashBytes() { return toBlockHash32; }
}