감사 상세를 무손실 압축하고 이전 기수 정리 처리량을 개선한다

packages/infra/test/playAuditDecisionCodec.test.ts

@@ -0,0 +1,54 @@
+import { gzipSync } from 'node:zlib';
+import { describe, expect, it } from 'vitest';
+import { decodeAuditDecisionSteps, encodeAuditDecisionSteps } from '../src/playAuditDecisionCodec.js';
+
+describe('lossless audit decision storage', () => {
+    it('compresses repeated context while preserving every value and its order', () => {
+        const steps = Array.from({ length: 128 }, (_, sequence) => ({
+            sequence,
+            phase: 'general',
+            generalId: 51,
+            nationId: 3,
+            cityId: 12,
+            year: 190,
+            month: 7,
+            kind: 'RNG',
+            value: sequence / 128,
+            text: '판단·줄바꿈\n따옴표 " 그대로',
+            empty: null,
+        }));
+        const stored = encodeAuditDecisionSteps(steps);
+        expect(Array.isArray(stored)).toBe(false);
+        expect(Buffer.byteLength(JSON.stringify(stored))).toBeLessThan(Buffer.byteLength(JSON.stringify(steps)) / 3);
+        expect(decodeAuditDecisionSteps(stored)).toEqual(steps);
+    });
+    it('keeps tiny and historical uncompressed arrays readable', () => {
+        expect(encodeAuditDecisionSteps([])).toEqual([]);
+        expect(decodeAuditDecisionSteps([{ marker: 'legacy', sequence: 0 }])).toEqual([
+            { marker: 'legacy', sequence: 0 },
+        ]);
+    });
+    it('rejects unknown versions, bad base64, truncated gzip and invalid contents', () => {
+        for (const value of [
+            null,
+            {},
+            { encoding: 'gzip-json-v2', data: '' },
+            { encoding: 'gzip-json-v1', data: '%%%' },
+            { encoding: 'gzip-json-v1', data: 'YQ==' },
+            { encoding: 'gzip-json-v1', data: gzipSync('{}').toString('base64') },
+            { encoding: 'gzip-json-v1', data: gzipSync(JSON.stringify(Array(129).fill(null))).toString('base64') },
+        ])
+            expect(() => decodeAuditDecisionSteps(value)).toThrow();
+        expect(() => encodeAuditDecisionSteps(Array(129).fill(null))).toThrow();
+    });
+    it('bounds decompression and preserves oversized raw records rather than truncating them', () => {
+        const steps = [{ text: 'x'.repeat(16 * 1024 * 1024) }];
+        expect(encodeAuditDecisionSteps(steps)).toEqual(steps);
+        expect(() =>
+            decodeAuditDecisionSteps({
+                encoding: 'gzip-json-v1',
+                data: gzipSync(JSON.stringify(steps)).toString('base64'),
+            })
+        ).toThrow('Corrupt');
+    });
+});