googledonts/app.py

from flask import Flask, request, Response, render_template
import requests
import re

app = Flask(__name__)

FONT_STATIC_URL = "https://fonts.gstatic.com"
FONT_API_URL = "https://fonts.googleapis.com"

PATTERN = rb"fonts\.gstatic\.com"


@app.route("/")
def home():
    domain = request.url_root
    return render_template("index.html", domain=domain)


@app.route("/s/<path:path>", methods=["GET"])
def proxy_fonts_static(path):
    url = f"{FONT_STATIC_URL}/s/{path}"
    response = requests.get(url, stream=True)

    def generate():
        for chunk in response.iter_content(chunk_size=8192):
            yield chunk

    # Remove hop-by-hop headers
    headers = {
        key: value
        for key, value in response.headers.items()
        if key.lower()
        not in [
            "connection",
            "keep-alive",
            "proxy-authenticate",
            "proxy-authorization",
            "te",
            "trailers",
            "transfer-encoding",
            "upgrade",
        ]
    }
    return Response(generate(), status=response.status_code, headers=headers)


@app.route("/<path:path>", methods=["GET"])
def proxy_fonts_api(path):
    query_string = request.query_string.decode("utf-8")
    url = f"{FONT_API_URL}/{path}"
    if query_string:
        url += f"?{query_string}"
    headers = {
        key: value for (key, value) in request.headers.items() if key.lower() != "host"
    }
    headers["Accept-Encoding"] = (
        ""  # Disable Accept-Encoding to avoid compressed responses
    )

    response = requests.get(url, headers=headers)
    replacement = request.host.encode(
        "utf-8"
    )  # Convert the host to bytes for replacement

    if "text/css" in response.headers.get("Content-Type", ""):
        content = response.content
        content = re.sub(PATTERN, replacement, content)

        headers = {
            key: value
            for key, value in response.headers.items()
            if key.lower()
            not in [
                "connection",
                "keep-alive",
                "proxy-authenticate",
                "proxy-authorization",
                "te",
                "trailers",
                "transfer-encoding",
                "upgrade",
            ]
        }
        return Response(content, status=response.status_code, headers=headers)
    else:
        # For non-CSS content, return as is
        headers = {
            key: value
            for key, value in response.headers.items()
            if key.lower()
            not in [
                "connection",
                "keep-alive",
                "proxy-authenticate",
                "proxy-authorization",
                "te",
                "trailers",
                "transfer-encoding",
                "upgrade",
            ]
        }
        return Response(response.content, status=response.status_code, headers=headers)


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5678)