81 lines
2.9 KiB
Java
81 lines
2.9 KiB
Java
package com.baiyue.common.event;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.SerializationFeature;
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/**
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* 将 JSON 负载转换为稳定字节序列，避免对象字段顺序不同导致摘要不一致。
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*/
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public final class EventPayloadCanonicalizer {
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private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
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.configure(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS, true);
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private EventPayloadCanonicalizer() {
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}
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/**
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* 递归排序对象字段并输出 UTF-8 JSON 字节。
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*/
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public static byte[] canonicalize(JsonNode payload) {
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if (payload == null || payload.isNull()) {
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throw new IllegalArgumentException("事件负载不能为空");
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}
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return write(sort(payload));
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}
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/** 仅用于接收规范化数字规则上线前已经生成的历史摘要。 */
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public static byte[] canonicalizeLegacy(JsonNode payload) {
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if (payload == null || payload.isNull()) {
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throw new IllegalArgumentException("事件负载不能为空");
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}
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return write(sortLegacy(payload));
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}
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private static byte[] write(JsonNode payload) {
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try {
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return OBJECT_MAPPER.writeValueAsBytes(payload);
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} catch (JsonProcessingException exception) {
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throw new IllegalArgumentException("事件负载无法规范化", exception);
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}
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}
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private static JsonNode sort(JsonNode node) {
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if (node.isObject()) {
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var names = new java.util.ArrayList<String>();
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node.fieldNames().forEachRemaining(names::add);
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names.sort(String::compareTo);
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var result = OBJECT_MAPPER.createObjectNode();
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names.forEach(name -> result.set(name, sort(node.get(name))));
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return result;
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}
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if (node.isArray()) {
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var result = OBJECT_MAPPER.createArrayNode();
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node.forEach(child -> result.add(sort(child)));
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return result;
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}
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if (node.isNumber()) {
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return com.fasterxml.jackson.databind.node.DecimalNode.valueOf(node.decimalValue().stripTrailingZeros());
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}
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return node;
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}
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private static JsonNode sortLegacy(JsonNode node) {
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if (node.isObject()) {
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var names = new java.util.ArrayList<String>();
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node.fieldNames().forEachRemaining(names::add);
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names.sort(String::compareTo);
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var result = OBJECT_MAPPER.createObjectNode();
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names.forEach(name -> result.set(name, sortLegacy(node.get(name))));
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return result;
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}
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if (node.isArray()) {
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var result = OBJECT_MAPPER.createArrayNode();
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node.forEach(child -> result.add(sortLegacy(child)));
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return result;
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}
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return node;
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}
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}
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