First Commit(なのに未完成)

src/lib/account.ts

@@ -0,0 +1,38 @@
+import Database, { getByIndex } from "@/lib/db";
+
+export async function isSignin(db: Database) {
+  const origin = await getByIndex(db.server, "name", "origin");
+  const token = await getByIndex(db.server, "name", "token");
+  
+  if (
+    origin === undefined ||
+    token === undefined
+  ) {
+    return false;
+  }
+  
+  try {
+    const req = await fetch(new URL("/api/me/", origin.value), {
+      method: "POST",
+      body: JSON.stringify({
+        token: token.value,
+      }),
+    });
+  
+    const res = await req.json();
+    
+    if (!res.success) {
+      await db.server.delete(origin.id);
+      await db.server.delete(token.id);
+      
+      return false;
+    } else {
+      return true;
+    }
+  } catch (err) {
+    await db.server.delete(origin.id);
+    await db.server.delete(token.id);
+    
+    throw err;
+  }
+}