feat: Add README and dynamic port configuration

Introduces a README with setup and usage instructions for the GoogleDonts app, enhancing accessibility and guidance for users.

Adapts the app to use an environment variable for port configuration, allowing flexibility in deployment environments, which defaults to port 5678 when unset.

Refactors request headers to exclude "Accept-Encoding", ensuring compatibility with font responses.

This update aims to support user autonomy in hosting and increase privacy assurance.

Relates to potential improvements in user deployment experiences and privacy measures.

README.md

@@ -0,0 +1,46 @@
+# GoogleDonts - a privacy-friendly Google Fonts proxy
+
+GoogleDonts is a Flask app that acts as a proxy for Google Fonts. It allows you to use fonts without disclosing your website visitors' IP addresses to Google.
+
+## How it works
+
+GoogleDonts works by fetching the font files from Google and serving them to the client. This way, the client's IP address is never disclosed to Google. It does not store any data about the client.
+
+It modifies the CSS files so that the font URLs also point to the proxy. This way, the client's browser fetches the font files from the proxy instead of Google.
+
+### Disclaimer
+
+We try our best to ensure that users do not make any connections to Google's servers. However, we cannot guarantee that we catch everything. If you find any issues, please report them. And if at all possible, please host your own fonts instead of using Google Fonts.
+
+## Setup
+
+1. Clone the repository
+
+```bash
+git clone https://git.private.coffee/PrivateCoffee/googledonts.git
+cd googledonts
+```
+
+2. Create a virtual environment and install the dependencies
+
+```bash
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+```
+
+3. Use the flask command or a WSGI server to run the app
+
+```bash
+flask run
+```
+
+In production, you should use a WSGI server like uWSGI, and a reverse proxy like Caddy. Ensure that your server does not log the client's IP address!
+
+## Configuration
+
+GoogleDonts does not require any configuration. However, if you use `flask run`, you can set the `PORT` environment variable to change the port the app listens on. By default, it listens on port 5678.
+
+## License
+
+TypeNot is licensed under the MIT License. See [LICENSE](LICENSE) for more information.

app.py

@@ -1,6 +1,7 @@
 from flask import Flask, request, Response, render_template
 import requests
 import re
+import os
 
 app = Flask(__name__)
 
@@ -51,11 +52,8 @@ def proxy_fonts_api(path):
     if query_string:
         url += f"?{query_string}"
     headers = {
-        key: value for (key, value) in request.headers.items() if key.lower() != "host"
+        "Accept-Encoding": ""
     }
-    headers["Accept-Encoding"] = (
-        ""  # Disable Accept-Encoding to avoid compressed responses
-    )
 
     response = requests.get(url, headers=headers)
     replacement = request.host.encode(
@@ -103,4 +101,4 @@ def proxy_fonts_api(path):
 
 
 if __name__ == "__main__":
-    app.run(host="0.0.0.0", port=5678)
+    app.run(host="0.0.0.0", port=os.environ.get("PORT", 5678))