상위 디렉터리 및 카테고리의 소유권을 검증하지 않던 문제 등 버그 수정 및 Vitest 기반 테스트 추가

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/range.test.ts

@@ -0,0 +1,68 @@
+import { describe, expect, it } from "vitest";
+import { CHUNK_SIZE, ENCRYPTED_CHUNK_SIZE, ENCRYPTION_OVERHEAD } from "#lib/constants/index.js";
+import { getContentRangeHeader, parseRangeHeader } from "#lib/modules/http.js";
+import { getDecryptedSize, getEncryptedRange } from "../../src/service-worker/modules/crypto";
+
+describe("parseRangeHeader", () => {
+  it("parses byte ranges", () => {
+    expect(parseRangeHeader(null)).toBeUndefined();
+    expect(parseRangeHeader("bytes=0-")).toEqual({ start: 0, end: undefined });
+    expect(parseRangeHeader("bytes=10-20")).toEqual({ start: 10, end: 20 });
+    expect(parseRangeHeader("bytes=10-20, 30-40")).toEqual({ start: 10, end: 20 });
+  });
+
+  it("formats Content-Range", () => {
+    expect(getContentRangeHeader({ start: 1, end: 2, total: 3 })).toEqual({
+      "Content-Range": "bytes 1-2/3",
+    });
+  });
+});
+
+describe("encrypted chunk layout", () => {
+  const encryptedSizeOf = (size: number) =>
+    size + Math.ceil(size / CHUNK_SIZE) * ENCRYPTION_OVERHEAD;
+
+  it.each([1, CHUNK_SIZE - 1, CHUNK_SIZE, CHUNK_SIZE + 1, 3 * CHUNK_SIZE + 12345])(
+    "computes the decrypted size of %i bytes",
+    (size) => {
+      expect(getDecryptedSize(encryptedSizeOf(size), false)).toBe(size);
+    },
+  );
+
+  it("computes the decrypted size of legacy files", () => {
+    expect(getDecryptedSize(100 + ENCRYPTION_OVERHEAD, true)).toBe(100);
+  });
+
+  it("maps a plaintext range to whole encrypted chunks", () => {
+    const totalSize = 3 * CHUNK_SIZE + 100;
+    const totalEncryptedSize = encryptedSizeOf(totalSize);
+
+    expect(getEncryptedRange(0, 10, totalEncryptedSize, false)).toEqual({
+      firstChunkIndex: 0,
+      lastChunkIndex: 0,
+      start: 0,
+      end: ENCRYPTED_CHUNK_SIZE - 1,
+    });
+    expect(getEncryptedRange(CHUNK_SIZE - 1, CHUNK_SIZE, totalEncryptedSize, false)).toEqual({
+      firstChunkIndex: 0,
+      lastChunkIndex: 1,
+      start: 0,
+      end: 2 * ENCRYPTED_CHUNK_SIZE - 1,
+    });
+    expect(getEncryptedRange(totalSize - 1, totalSize - 1, totalEncryptedSize, false)).toEqual({
+      firstChunkIndex: 3,
+      lastChunkIndex: 3,
+      start: 3 * ENCRYPTED_CHUNK_SIZE,
+      end: totalEncryptedSize - 1,
+    });
+  });
+
+  it("maps any range of legacy files to the whole file", () => {
+    expect(getEncryptedRange(5, 10, 1000, true)).toEqual({
+      firstChunkIndex: 0,
+      lastChunkIndex: 0,
+      start: 0,
+      end: 999,
+    });
+  });
+});