diff --git a/src/app/jams/oauth/login/route.ts b/src/app/jams/oauth/login/route.ts
index a8884b0..1b36439 100644
--- a/src/app/jams/oauth/login/route.ts
+++ b/src/app/jams/oauth/login/route.ts
@@ -2,6 +2,7 @@ import { AppTable, db } from "@/lib/mastoauth/kysely";
 import { MastoAuth } from "@/lib/mastoauth/mastoauth";
 import { cookies } from "next/headers";
 import { NextRequest } from "next/server";
+import crypto from "node:crypto";
 
 export async function GET(request: NextRequest) {
   const cookieStore = cookies();
@@ -9,6 +10,7 @@ export async function GET(request: NextRequest) {
   if (instance == null) return new Response('', {
     status: 400
   });
+  let useMiAuth = false;
   const mauth = new MastoAuth(instance);
 
   // Check if instance is fediblocked
@@ -56,16 +58,23 @@ export async function GET(request: NextRequest) {
     // Create new app
     const temp_iapp = await mauth.newApplication();
 
-    if (temp_iapp == null) return new Response('', {
-      status: 400
-    });
-
-    existingInstanceApp = {
-      instance_domain: instance,
-      client_id: temp_iapp.client_id,
-      client_secret: temp_iapp.client_secret,
-      redirect_uri: temp_iapp.redirect_uri
-    } as AppTable;
+    // Misskey.
+    if (temp_iapp != null)
+      existingInstanceApp = {
+        instance_domain: instance,
+        client_id: temp_iapp.client_id,
+        client_secret: temp_iapp.client_secret,
+        redirect_uri: temp_iapp.redirect_uri
+      } as AppTable;
+    else {
+      useMiAuth = true;
+      existingInstanceApp = {
+        instance_domain: instance,
+        client_id: "https://abtmtr.link/jams/",
+        client_secret: "MISSKEY",
+        redirect_uri: "https://abtmtr.link/jams/oauth/code"
+      } as AppTable;
+    }
 
     try {
       await db.insertInto('apps')
@@ -79,12 +88,30 @@ export async function GET(request: NextRequest) {
     }
   }
 
+  const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-._~";
+  const codeVerifier = new Array(128)
+    .fill(0)
+    .map(() => chars[Math.floor(chars.length * Math.random())])
+    .join("");
+  console.log('code_verifier', codeVerifier);
+
+  const codeChallenge = crypto
+    .createHash("sha256")
+    .update(codeVerifier, "ascii")
+    .digest("base64url");
+  console.log('code_challenge', codeChallenge);
+
+  const state = crypto.randomUUID();
+  console.log('state', state);
+
   cookieStore.set("instance", instance, {
     expires: Date.now() + 604800000
   });
   if (instance == "discord.com")
-    return Response.redirect(`https://${instance}/oauth2/authorize?response_type=code&client_id=${existingInstanceApp.client_id}&redirect_uri=${existingInstanceApp.redirect_uri}&scope=identify&state=${Math.random().toString(36).slice(2)}&integration_type=1`)
+    return Response.redirect(`https://${instance}/oauth2/authorize?response_type=code&client_id=${existingInstanceApp.client_id}&redirect_uri=${existingInstanceApp.redirect_uri}&scope=identify&state=${state}&integration_type=1`)
   if (instance == "github.com")
-    return Response.redirect(`https://${instance}/login/oauth/authorize?client_id=${existingInstanceApp.client_id}&redirect_uri=${existingInstanceApp.redirect_uri}&scope=&state=${Math.random().toString(36).slice(2)}`)
+    return Response.redirect(`https://${instance}/login/oauth/authorize?client_id=${existingInstanceApp.client_id}&redirect_uri=${existingInstanceApp.redirect_uri}&scope=&state=${state}`)
+  if (useMiAuth)
+    return Response.redirect(`https://${instance}/oauth/authorize?response_type=code&client_id=${existingInstanceApp.client_id}&redirect_uri=${existingInstanceApp.redirect_uri}&state=${state}&code_challenge=${codeChallenge}&code_challenge_method=S256&scope=read`);
   return Response.redirect(`https://${instance}/oauth/authorize?response_type=code&client_id=${existingInstanceApp.client_id}&redirect_uri=${existingInstanceApp.redirect_uri}&scope=read`);
 }
\ No newline at end of file
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index d33174f..cef042d 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -22,6 +22,9 @@ export default function RootLayout({
       "--font-MaterialSymbols": materialSymbols.style.fontFamily, 
       "--font-Renogare": renogare.style.fontFamily
     } as {[key: string]: string}}>
+      <head>
+        <link rel='redirect_uri' href='/jams/oauth/code'></link>
+      </head>
       <body>{children}</body>
     </html>
   );