diff --git a/auth.py b/auth.py
new file mode 100644
index 0000000..2e30dfb
--- /dev/null
+++ b/auth.py
@@ -0,0 +1,115 @@
+from flask import Flask, Response, redirect
+from flask import request
+from markupsafe import escape
+from mastodon import Mastodon
+from email.headerregistry import Address
+import jwt
+import shelve
+from gevent.pywsgi import WSGIServer
+import os
+
+SECRET = os.environ["SECRET"]
+ZULIP = f"https://{os.environ['ZULIP']}/accounts/login/jwt/"
+REDIRECT = f"https://{os.environ['ZULIP']}/callback"
+SHELVE_LOCATION = os.environ.get("DB_DIR", "/var/lib/fedi-zulip")
+PORT = int(os.environ.get("PORT", "5000"))
+
+app = Flask(__name__)
+
+@app.get("/")
+def index():
+    return f"""
+<!DOCTYPE html>
+<html lang="en">
+ <body>
+    <h1>Login to Pleroma Chat Using Handle</h1>
+    <p>
+        You can use this page to login to {os.environ['ZULIP']} using your
+        Pleroma, Akkoma or Mastodon handle. Format is <code>nickname@server</code>.
+    </p>
+    <form action="/login" method="post">
+        <label for="nickname">Fediverse handle</label>
+        <br>
+        <input type="email" id="nickname" name="nickname">
+        <button>login</button>
+    </form>
+ </body>
+</html>
+"""
+
+
+@app.post("/login")
+def login():
+    instance = Address(addr_spec=request.form["nickname"]).domain
+    try:
+        with shelve.open(SHELVE_LOCATION) as apps:
+            app = apps.get(instance)
+            if app == None:
+                (client, secret) = Mastodon.create_app(
+                    "zulip",
+                    scopes=["read"],
+                    redirect_uris=REDIRECT,
+                    api_base_url=f"https://{instance}",
+                )
+                apps[instance] = (client, secret)
+
+            (client, secret) = apps[instance]
+            masto = Mastodon(
+                client_id=client,
+                client_secret=secret,
+                api_base_url=f"https://{instance}",
+            )
+            oauth = Mastodon.auth_request_url(
+                masto,
+                scopes=["read"],
+                force_login=True,
+                redirect_uris=REDIRECT,
+                state=instance,
+            )
+            return redirect(oauth)
+    except Exception as e:
+        print(e)
+        return Response("fail", status=400)
+
+
+@app.get("/callback")
+def callback():
+    oauth = request.args.get("code")
+    instance = request.args.get("state")
+    if oauth != None and instance != None:
+        try:
+            with shelve.open(SHELVE_LOCATION) as apps:
+                app = apps.get(instance)
+                if app != None:
+                    masto = Mastodon(
+                        client_id=app[0],
+                        client_secret=app[1],
+                        api_base_url=f"https://{instance}",
+                    )
+                    Mastodon.log_in(masto, code=oauth, scopes=["read"])
+                    creds = Mastodon.account_verify_credentials(masto)
+                    token = jwt.encode(
+                        {"email": f"{creds.acct}@{instance}"},
+                        SECRET,
+                        algorithm="HS256",
+                    )
+                    return f"""
+<!DOCTYPE html>
+                        <html lang="en">
+                            <body>
+                                <form name="zulip" action="{ZULIP}" method="post">
+                                    <input type="hidden" name="token" value={escape(token)}>
+                                    <button>login to zulip</button>
+                                </form>
+                                <script type="text/javascript">
+                                    document.zulip.submit();
+                                </script>
+                            </body>
+                        </html>
+                    """
+        except:
+            pass
+    return Response("fail", status=400)
+
+http_server = WSGIServer(("127.0.0.1", PORT), app)
+http_server.serve_forever()
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..ebfa02f
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+flask
+markupsafe
+mastodon
