enhance(server): downloadUrlでContent-Dispositionからファイル名を取得 (#10150)

* enhance(server): downloadUrlでContent-Dispositionからファイル名を取得
Resolve #10036
Resolve #4750

* untitled

* オブジェクトストレージのContent-Dispositionのファイル名の拡張子をContent-Typeに添ったものにする

* ✌️

* tiff

* fix filename

* add test

* /files/でもContent-Disposition

* comment

* fix test

packages/backend/test/unit/misc/others.ts

@@ -0,0 +1,39 @@
+import { describe, test, expect } from '@jest/globals';
+import { contentDisposition } from '@/misc/content-disposition.js';
+import { correctFilename } from '@/misc/correct-filename.js';
+
+describe('misc:content-disposition', () => {
+    test('inline', () => {
+        expect(contentDisposition('inline', 'foo bar')).toBe('inline; filename=\"foo_bar\"; filename*=UTF-8\'\'foo%20bar');
+    });
+    test('attachment', () => {
+        expect(contentDisposition('attachment', 'foo bar')).toBe('attachment; filename=\"foo_bar\"; filename*=UTF-8\'\'foo%20bar');
+    });
+    test('non ascii', () => {
+        expect(contentDisposition('attachment', 'ファイル名')).toBe('attachment; filename=\"_____\"; filename*=UTF-8\'\'%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E5%90%8D');
+    });
+});
+
+describe('misc:correct-filename', () => {
+    test('simple', () => {
+        expect(correctFilename('filename', 'jpg')).toBe('filename.jpg');
+    });
+    test('with same ext', () => {
+        expect(correctFilename('filename.jpg', 'jpg')).toBe('filename.jpg');
+    });
+    test('with different ext', () => {
+        expect(correctFilename('filename.webp', 'jpg')).toBe('filename.webp.jpg');
+    });
+    test('non ascii with space', () => {
+        expect(correctFilename('ファイル 名前', 'jpg')).toBe('ファイル 名前.jpg');
+    });
+    test('jpeg', () => {
+        expect(correctFilename('filename.jpeg', 'jpg')).toBe('filename.jpeg');
+    });
+    test('tiff', () => {
+        expect(correctFilename('filename.tiff', 'tif')).toBe('filename.tiff');
+    });
+    test('null ext', () => {
+        expect(correctFilename('filename', null)).toBe('filename.unknown');
+    });
+});