From f4abef1ed67f430c69924fc2b5483244ac226908 Mon Sep 17 00:00:00 2001
From: n <git@wnd.sh>
Date: Thu, 1 May 2025 05:01:35 +0100
Subject: [PATCH] initial commit

---
 .env.example     |  3 +++
 .gitignore       |  3 +++
 Dockerfile       | 14 ++++++++++++++
 app/__init__.py  |  0
 app/main.py      | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
 requirements.txt |  3 +++
 6 files changed, 73 insertions(+)
 create mode 100644 .env.example
 create mode 100644 .gitignore
 create mode 100644 Dockerfile
 create mode 100644 app/__init__.py
 create mode 100644 app/main.py
 create mode 100644 requirements.txt

diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..9ddc45b
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,3 @@
+MONZO_CLIENT_ID=oauth2client_xxx
+MONZO_CLIENT_SECRET=mnzconf.base64-string
+MONZO_CALLBACK_URI=http://localhost:8000/callback
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8820971
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.env
+.env.public
+.env.private
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..2b2a0e0
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,14 @@
+FROM ghcr.io/astral-sh/uv:alpine
+
+RUN uv venv /code/.venv
+WORKDIR /code
+
+COPY ./requirements.txt /code/requirements.txt
+
+RUN uv pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+COPY ./app /code/app
+
+# If running behind a proxy like Nginx or Traefik add --proxy-headers
+# CMD ["uv", "run", "fastapi", "run", "app/main.py", "--port", "80", "--proxy-headers"]
+CMD ["uv", "run", "fastapi", "run", "app/main.py", "--port", "80"]
diff --git a/app/__init__.py b/app/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/main.py b/app/main.py
new file mode 100644
index 0000000..5f76f5b
--- /dev/null
+++ b/app/main.py
@@ -0,0 +1,50 @@
+from collections import OrderedDict
+from dotenv import load_dotenv
+from fastapi import FastAPI
+from fastapi.responses import RedirectResponse
+from uuid import uuid4
+from urllib.parse import urlencode
+from typing import Union
+import requests
+import os
+
+load_dotenv()
+client_id = os.environ['MONZO_CLIENT_ID']
+client_secret = os.environ['MONZO_CLIENT_SECRET']
+callback_uri = os.environ['MONZO_CALLBACK_URI']
+
+app = FastAPI()
+
+@app.get("/")
+def read_root(): return {"version": "v0.0.4"}
+
+
+@app.get("/redirect", response_class=RedirectResponse)
+def read_redirect():
+    state = uuid4()
+    # TODO: store state in a cookie to check it later
+    query = urlencode(OrderedDict(
+        client_id=client_id,
+        redirect_uri=callback_uri,
+        state=state,
+        response_type="code",
+    ))
+    return f"https://auth.monzo.com/?{query}"
+
+
+@app.get("/callback")
+def read_callback(code: str, state: str):
+    # TODO: check the state with the user's cookie
+    data = {
+        'grant_type': 'authorization_code',
+        'client_id': client_id,
+        'client_secret': client_secret,
+        'redirect_uri': callback_uri,
+        'code': code,
+    }
+    response = requests.post("https://api.monzo.com/oauth2/token", data=data)
+    return response.json()
+
+@app.get("/items/{item_id}")
+def read_item(item_id: int, q: Union[str, None] = None):
+    return {"item_id": item_id, "q": q}
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..1b3223d
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+fastapi[standard]>=0.113.0,<0.114.0
+pydantic>=2.7.0,<3.0.0
+requests>=2.32.3