diff --git a/.env.dist b/.env.dist
index a42131a..967c4cd 100644
--- a/.env.dist
+++ b/.env.dist
@@ -1,2 +1,3 @@
 DISCORD_TOKEN=
-SENTRY_DSN=
+OAUTH2_CLIENT_ID=
+OAUTH2_CLIENT_SECRET=
diff --git a/bot.py b/bot.py
index 2e3fdd2..a362465 100644
--- a/bot.py
+++ b/bot.py
@@ -7,19 +7,24 @@ from disnake import Client, Guild, Member
 from dotenv import load_dotenv
 from ics import Calendar, Event  # type: ignore
 from ics.alarm.display import DisplayAlarm  # type: ignore
-from quart import Quart, abort
-from sentry_sdk import init
-from sentry_sdk.integrations.quart import QuartIntegration
+from quart import Quart, redirect, request, session, url_for
+from requests_oauthlib import OAuth2Session  # type: ignore
 
 load_dotenv()
 
 DISCORD_TOKEN = environ.get("DISCORD_TOKEN")
-if not DISCORD_TOKEN:
-    raise Exception("Missing DISCORD_TOKEN env")
+OAUTH2_CLIENT_ID = environ.get("OAUTH2_CLIENT_ID")
+OAUTH2_CLIENT_SECRET = environ.get("OAUTH2_CLIENT_SECRET")
+OAUTH2_REDIRECT_URI = environ.get("OAUTH2_REDIRECT_URI", "callback")
+if not DISCORD_TOKEN or not OAUTH2_CLIENT_ID or not OAUTH2_CLIENT_SECRET:
+    raise Exception(
+        "Missing some env variables "
+        "(could be DISCORD_TOKEN, OAUTH2_CLIENT_ID or OAUTH2_CLIENT_SECRET)"
+    )
 
-SENTRY_DSN = environ.get("SENTRY_DSN")
-if SENTRY_DSN:
-    init(SENTRY_DSN, integrations=[QuartIntegration()])
+API_BASE_URL = environ.get("API_BASE_URL", "https://discordapp.com/api")
+AUTHORIZATION_BASE_URL = API_BASE_URL + "/oauth2/authorize"
+TOKEN_URL = API_BASE_URL + "/oauth2/token"
 
 
 class Discord(Client):
@@ -29,6 +34,7 @@ class Discord(Client):
 
 client = Discord()
 app = Quart(__name__)
+app.config["SECRET_KEY"] = OAUTH2_CLIENT_SECRET
 
 
 def get_guild_by_id(guild_id: Union[int, str]) -> Optional[Guild]:
@@ -55,11 +61,63 @@ async def get_guild_tag(member: Member) -> Optional[str]:
     return None
 
 
+def token_updater(token: str) -> None:
+    session["oauth2_token"] = token
+
+
+def make_oauth_session(
+    host_url: str,
+    token: Optional[str] = None,
+    state: Optional[str] = None,
+    scope: Optional[list[str]] = None,
+) -> OAuth2Session:
+    print(host_url + OAUTH2_REDIRECT_URI)
+    return OAuth2Session(
+        client_id=OAUTH2_CLIENT_ID,
+        token=token,
+        state=state,
+        scope=scope,
+        redirect_uri=host_url + OAUTH2_REDIRECT_URI,
+        auto_refresh_kwargs={
+            "client_id": OAUTH2_CLIENT_ID,
+            "client_secret": OAUTH2_CLIENT_SECRET,
+        },
+        auto_refresh_url=TOKEN_URL,
+        token_updater=token_updater,
+    )
+
+
+@app.route("/login")
+async def login():
+    discord = make_oauth_session(host_url=request.host_url, scope=["guilds"])
+    authorization_url, state = discord.authorization_url(AUTHORIZATION_BASE_URL)
+    session["oauth2_state"] = state
+    return redirect(authorization_url)
+
+
+@app.route("/callback")
+async def callback():
+    request_values = await request.values
+    if request_values.get("error"):
+        return request_values["error"]
+    discord = make_oauth_session(
+        host_url=request.host_url, state=session.get("oauth2_state")
+    )
+    token = discord.fetch_token(
+        TOKEN_URL,
+        client_secret=OAUTH2_CLIENT_SECRET,
+        authorization_response=request.url,
+    )
+    session["oauth2_token"] = token
+    print(token)
+    return ""
+
+
 @app.route("/<guild_id>.ics")
 async def index(guild_id):
     guild = get_guild_by_id(guild_id)
     if guild is None:
-        abort(404)
+        return redirect(url_for(".login"))
 
     bot = get_bot_member(guild)
     guild_tag = await get_guild_tag(bot)
diff --git a/poetry.lock b/poetry.lock
index d2cf2fa..8422c12 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -369,6 +369,19 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "oauthlib"
+version = "3.2.0"
+description = "A generic, spec-compliant, thorough implementation of the OAuth request-signing logic"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+rsa = ["cryptography (>=3.0.0)"]
+signals = ["blinker (>=1.4.0)"]
+signedtoken = ["cryptography (>=3.0.0)", "pyjwt (>=2.0.0,<3)"]
+
 [[package]]
 name = "pathspec"
 version = "0.9.0"
@@ -458,36 +471,37 @@ werkzeug = ">=2.0.0"
 dotenv = ["python-dotenv"]
 
 [[package]]
-name = "sentry-sdk"
-version = "1.5.11"
-description = "Python client for Sentry (https://sentry.io)"
+name = "requests"
+version = "2.27.1"
+description = "Python HTTP for Humans."
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
 
 [package.dependencies]
-blinker = {version = ">=1.1", optional = true, markers = "extra == \"quart\""}
-certifi = "*"
-quart = {version = ">=0.16.1", optional = true, markers = "extra == \"quart\""}
-urllib3 = ">=1.10.0"
+certifi = ">=2017.4.17"
+charset-normalizer = {version = ">=2.0.0,<2.1.0", markers = "python_version >= \"3\""}
+idna = {version = ">=2.5,<4", markers = "python_version >= \"3\""}
+urllib3 = ">=1.21.1,<1.27"
 
 [package.extras]
-aiohttp = ["aiohttp (>=3.5)"]
-beam = ["apache-beam (>=2.12)"]
-bottle = ["bottle (>=0.12.13)"]
-celery = ["celery (>=3)"]
-chalice = ["chalice (>=1.16.0)"]
-django = ["django (>=1.8)"]
-falcon = ["falcon (>=1.4)"]
-flask = ["flask (>=0.11)", "blinker (>=1.1)"]
-httpx = ["httpx (>=0.16.0)"]
-pure_eval = ["pure-eval", "executing", "asttokens"]
-pyspark = ["pyspark (>=2.4.4)"]
-quart = ["quart (>=0.16.1)", "blinker (>=1.1)"]
-rq = ["rq (>=0.6)"]
-sanic = ["sanic (>=0.8)"]
-sqlalchemy = ["sqlalchemy (>=1.2)"]
-tornado = ["tornado (>=5)"]
+socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
+use_chardet_on_py3 = ["chardet (>=3.0.2,<5)"]
+
+[[package]]
+name = "requests-oauthlib"
+version = "1.3.1"
+description = "OAuthlib authentication support for Requests."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.dependencies]
+oauthlib = ">=3.0.0"
+requests = ">=2.0.0"
+
+[package.extras]
+rsa = ["oauthlib[signedtoken] (>=3.0.0)"]
 
 [[package]]
 name = "six"
@@ -595,7 +609,7 @@ multidict = ">=4.0"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "3e4b5f68ee271697671c0b54ea6463947b11d2a701f022240e3f2ec0f3a87c79"
+content-hash = "b2bf381b8cdd3f6dac5453b4744dafa57d6d38739367d29b799c9dfb703628b6"
 
 [metadata.files]
 aiofiles = [
@@ -990,6 +1004,10 @@ mypy-extensions = [
     {file = "mypy_extensions-0.4.3-py2.py3-none-any.whl", hash = "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d"},
     {file = "mypy_extensions-0.4.3.tar.gz", hash = "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"},
 ]
+oauthlib = [
+    {file = "oauthlib-3.2.0-py3-none-any.whl", hash = "sha256:6db33440354787f9b7f3a6dbd4febf5d0f93758354060e802f6c06cb493022fe"},
+    {file = "oauthlib-3.2.0.tar.gz", hash = "sha256:23a8208d75b902797ea29fd31fa80a15ed9dc2c6c16fe73f5d346f83f6fa27a2"},
+]
 pathspec = [
     {file = "pathspec-0.9.0-py2.py3-none-any.whl", hash = "sha256:7d15c4ddb0b5c802d161efc417ec1a2558ea2653c2e8ad9c19098201dc1c993a"},
     {file = "pathspec-0.9.0.tar.gz", hash = "sha256:e564499435a2673d586f6b2130bb5b95f04a3ba06f81b8f895b651a3c76aabb1"},
@@ -1022,9 +1040,13 @@ quart = [
     {file = "Quart-0.17.0-py3-none-any.whl", hash = "sha256:69480e7384935feff1f50293a8cb70c5d31f568af94ed792d043bb368b50bd50"},
     {file = "Quart-0.17.0.tar.gz", hash = "sha256:2cf213d8b83fa701a83e3b3125e9102a937cefd1e97e9583f22ee2fa79139640"},
 ]
-sentry-sdk = [
-    {file = "sentry-sdk-1.5.11.tar.gz", hash = "sha256:6c01d9d0b65935fd275adc120194737d1df317dce811e642cbf0394d0d37a007"},
-    {file = "sentry_sdk-1.5.11-py2.py3-none-any.whl", hash = "sha256:c17179183cac614e900cbd048dab03f49a48e2820182ec686c25e7ce46f8548f"},
+requests = [
+    {file = "requests-2.27.1-py2.py3-none-any.whl", hash = "sha256:f22fa1e554c9ddfd16e6e41ac79759e17be9e492b3587efa038054674760e72d"},
+    {file = "requests-2.27.1.tar.gz", hash = "sha256:68d7c56fd5a8999887728ef304a6d12edc7be74f1cfa47714fc8b414525c9a61"},
+]
+requests-oauthlib = [
+    {file = "requests-oauthlib-1.3.1.tar.gz", hash = "sha256:75beac4a47881eeb94d5ea5d6ad31ef88856affe2332b9aafb52c6452ccf0d7a"},
+    {file = "requests_oauthlib-1.3.1-py2.py3-none-any.whl", hash = "sha256:2577c501a2fb8d05a304c09d090d6e47c306fef15809d102b327cf8364bddab5"},
 ]
 six = [
     {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
diff --git a/pyproject.toml b/pyproject.toml
index 87ab858..2c30c4f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,8 +11,7 @@ disnake = "2.5.0"
 ics = "0.7"
 python-dotenv = "0.20.0"
 quart = "0.17.0"
-sentry-sdk = {extras = ["quart"], version = "1.5.11"}
-
+requests-oauthlib = "1.3.1"
 
 [tool.poetry.dev-dependencies]
 flake8 = "4.0.1"