入力された文字列が動画のURLでなかったときの処理を追加

src/function.test.ts

@@ -0,0 +1,63 @@
+import {
+  assertEquals,
+  assertObjectMatch,
+} from "https://deno.land/std@0.212.0/assert/mod.ts";
+import { getInfo } from "./function.ts";
+
+Deno.test("動画の情報を取得できる", async () => {
+  const result = await getInfo(
+    "https://submarin.online/files/3e327bd6-8a90-49d0-8aed-1864c20e5209",
+  );
+
+  assertEquals(result.result, "ok");
+  assertObjectMatch(result, {
+    result: "ok",
+    fileInfo: {
+      name: "mov,mp4,m4a,3gp,3g2,mj2",
+      bitRate: 56565,
+      duration: 3750000,
+      url: "/3e327bd6-8a90-49d0-8aed-1864c20e5209",
+      nbStreams: 1,
+      flags: 2097152,
+      nbChapters: 0,
+      streams: [
+        {
+          id: 1,
+          startTime: 0,
+          duration: 57600,
+          codecType: 0,
+          codecName: "avc1",
+          format: "yuv420p",
+          bitRate: 48947,
+          profile: "High",
+          level: 13,
+          width: 468,
+          height: 82,
+          channels: 0,
+          sampleRate: 0,
+          frameSize: 0,
+          tags: [],
+        },
+      ],
+    },
+  });
+});
+
+Deno.test("URLでない文字列を渡すとエラーになる", async () => {
+  const result = await getInfo("hoge");
+
+  assertEquals(result.result, "err");
+  assertObjectMatch(result, { result: "err", error: "Invalid input: not URL" });
+});
+
+Deno.test("動画でないファイルを渡すとエラーになる", async () => {
+  const result = await getInfo(
+    "https://submarin.online/files",
+  );
+
+  assertEquals(result.result, "err");
+  assertObjectMatch(result, {
+    result: "err",
+    error: "Invalid input: not video",
+  });
+});

src/function.ts

@@ -43,17 +43,30 @@ export const getInfo = async (
   { result: "ok"; fileInfo: FileInfo } | { result: "err"; error: string }
 > => {
   if (!(path instanceof URL)) {
-    path = new URL(path);
+    try {
+      path = new URL(path);
+    } catch {
+      return { result: "err", error: "Invalid input: not URL" };
+    }
   }
   const filename = `/${path.pathname.split("/").slice(-1)[0]}`;
+  if (!filename) {
+    return { result: "err", error: "Invalid input: not video" };
+  }
   const file = wasi.fs.open(filename, {
     read: true,
     write: true,
     create: true,
   });
-  await fetch(path).then((res) => res.arrayBuffer()).then((buf) =>
-    file.write(new Uint8Array(buf))
-  );
+  const res = await fetch(path);
+  if (!res.ok || !res.headers.get("Content-Type")?.includes("video")) {
+    res.body?.cancel();
+
+    return { result: "err", error: "Invalid input: not video" };
+  }
+
+  const buf = await res.arrayBuffer();
+  file.write(new Uint8Array(buf))
   file.seek(0);
 
   const { ptr, len } = utf8Encode(filename);