feat(attachments): depolama soyutlaması, içerikten tür tespiti, sharp/HEIC dönüşümü ve yetkili dosya servisi

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

src/shared/attachments.test.ts

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+import { describe, expect, it } from "vitest";
+import {
+  acceptAttribute,
+  allowedAttachmentKinds,
+  detectFileType,
+  formatFileSize,
+  kindOf,
+} from "./attachments";
+
+const bytes = (...parts: (number[] | string)[]) =>
+  new Uint8Array(
+    parts.flatMap((p) => (typeof p === "string" ? [...p].map((c) => c.charCodeAt(0)) : p)),
+  );
+
+describe("detectFileType", () => {
+  it("imzalardan türü bulur", () => {
+    expect(detectFileType(bytes([0xff, 0xd8, 0xff, 0xe0]))).toBe("jpeg");
+    expect(detectFileType(bytes([0x89], "PNG", [0x0d, 0x0a, 0x1a, 0x0a]))).toBe("png");
+    expect(detectFileType(bytes("RIFF", [0, 0, 0, 0], "WEBPVP8 "))).toBe("webp");
+    expect(detectFileType(bytes("%PDF-1.7"))).toBe("pdf");
+  });
+
+  it("HEIC: ana veya uyumlu markadan", () => {
+    expect(detectFileType(bytes([0, 0, 0, 24], "ftypheic", [0, 0, 0, 0], "mif1heic"))).toBe("heic");
+    expect(detectFileType(bytes([0, 0, 0, 28], "ftypmif1", [0, 0, 0, 0], "mif1heichevc"))).toBe(
+      "heic",
+    );
+    // MP4 videosu HEIC değildir.
+    expect(detectFileType(bytes([0, 0, 0, 24], "ftypisom", [0, 0, 2, 0], "isomiso2"))).toBeNull();
+  });
+
+  it("uzantı/metin/kısa içerik reddedilir", () => {
+    expect(detectFileType(bytes("<svg xmlns="))).toBeNull();
+    expect(detectFileType(bytes("GIF89a"))).toBeNull();
+    expect(detectFileType(bytes([0xff, 0xd8]))).toBeNull();
+    expect(detectFileType(new Uint8Array())).toBeNull();
+  });
+});
+
+describe("tür kuralları", () => {
+  it("gider yalnızca görsel; gelir ve transfer görsel + PDF", () => {
+    expect(allowedAttachmentKinds("expense")).toEqual(["image"]);
+    expect(allowedAttachmentKinds("income")).toEqual(["image", "pdf"]);
+    expect(allowedAttachmentKinds("transfer")).toEqual(["image", "pdf"]);
+    expect(acceptAttribute(["image"])).not.toContain("pdf");
+    expect(acceptAttribute(["image", "pdf"])).toContain("application/pdf");
+    expect(kindOf("heic")).toBe("image");
+    expect(kindOf("pdf")).toBe("pdf");
+  });
+
+  it("boyut biçimi", () => {
+    expect(formatFileSize(900)).toBe("900 B");
+    expect(formatFileSize(2048)).toBe("2 KB");
+    expect(formatFileSize(1.5 * 1024 * 1024)).toBe("1,5 MB");
+  });
+});