feat: implement osu! installation validation

src/lib/api/ezpp.ts

@@ -1,6 +1,7 @@
 import ky from 'ky';
 
 const BANCHO_ENDPOINT = 'https://c.ez-pp.farm/';
+const ENDPOINT = 'https://ez-pp.farm/';
 
 export const ezppfarm = {
   ping: async (): Promise<number | undefined> => {
@@ -14,4 +15,44 @@ export const ezppfarm = {
       return undefined;
     }
   },
+  login: async (
+    username: string,
+    password: string
+  ): Promise<
+    | {
+        code: number;
+        message: string;
+        user?: {
+          id: number;
+          donor: boolean;
+          name: string;
+          email: string;
+        };
+      }
+    | undefined
+  > => {
+    try {
+      const request = await ky(`${ENDPOINT}login/check`, {
+        method: 'POST',
+        body: JSON.stringify({ username, password }),
+        headers: {
+          'Content-Type': 'application/json',
+          'User-Agent': 'EZPPLauncher',
+        },
+      });
+      if (!request.ok) return undefined;
+      return await request.json<{
+        code: number;
+        message: string;
+        user?: {
+          id: number;
+          donor: boolean;
+          name: string;
+          email: string;
+        };
+      }>();
+    } catch {
+      return undefined;
+    }
+  },
 };