feat: add home route and template for proxy instructions

Integrated a new home route in the application that renders a template with instructions on how to use the Google Fonts proxy service, enhancing user guidance. This change includes the addition of an `index.html` template, which provides a clear example and usage instructions, and minor refactoring of existing routes for improved readability.

app.py

@@ -1,15 +1,22 @@
-from flask import Flask, request, Response
+from flask import Flask, request, Response, render_template
 import requests
 import re
 
 app = Flask(__name__)
 
-FONT_STATIC_URL = 'https://fonts.gstatic.com'
+FONT_STATIC_URL = "https://fonts.gstatic.com"
-FONT_API_URL = 'https://fonts.googleapis.com'
+FONT_API_URL = "https://fonts.googleapis.com"
 
-PATTERN = rb'fonts\.gstatic\.com'
+PATTERN = rb"fonts\.gstatic\.com"
 
-@app.route('/s/<path:path>', methods=['GET'])
+
+@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)
@@ -19,34 +26,81 @@ def proxy_fonts_static(path):
             yield chunk
 
     # Remove hop-by-hop headers
-    headers = {key: value for key, value in response.headers.items() if key.lower() not in [
+    headers = {
-        'connection', 'keep-alive', 'proxy-authenticate', 'proxy-authorization', 'te', 'trailers', 'transfer-encoding', 'upgrade']}
+        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'])
+
+@app.route("/<path:path>", methods=["GET"])
 def proxy_fonts_api(path):
-    query_string = request.query_string.decode('utf-8')
+    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 = {
-    headers['Accept-Encoding'] = ''  # Disable Accept-Encoding to avoid compressed responses
+        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
+    replacement = request.host.encode(
+        "utf-8"
+    )  # Convert the host to bytes for replacement
 
-    if 'text/css' in response.headers.get('Content-Type', ''):
+    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 [
+        headers = {
-            'connection', 'keep-alive', 'proxy-authenticate', 'proxy-authorization', 'te', 'trailers', 'transfer-encoding', 'upgrade']}
+            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 [
+        headers = {
-            'connection', 'keep-alive', 'proxy-authenticate', 'proxy-authorization', 'te', 'trailers', 'transfer-encoding', 'upgrade']}
+            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)
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5678)

templates/index.html

@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta
+      name="viewport"
+      content="width=device-width, initial-scale=1, shrink-to-fit=no"
+    />
+    <title>GoogleDonts</title>
+    <link
+      href="https://nobsdelivr.private.coffee/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css"
+      rel="stylesheet"
+    />
+    <style>
+      body {
+        background-color: #f8f9fa;
+      }
+      .hero {
+        background: gray;
+        color: white;
+        padding: 100px 0;
+      }
+      .hero h1 {
+        font-size: 3.5rem;
+      }
+      .hero p {
+        font-size: 1.25rem;
+      }
+      .example-code {
+        background-color: #e9ecef;
+        padding: 15px;
+        border-radius: 5px;
+        font-family: monospace;
+      }
+    </style>
+  </head>
+  <body>
+    <header class="hero text-center">
+      <div class="container">
+        <h1 class="display-4">Welcome to GoogleDonts</h1>
+        <p class="lead">
+          GoogleDonts is a proxy service to Google Fonts. It allows you to use
+            Google Fonts without any data being sent to Google.
+        </p>
+      </div>
+    </header>
+    <main class="container text-center my-5">
+      <p class="lead">
+        To use the proxy, simply replace
+        <code>https://fonts.googleapis.com/</code> with <code>{{ domain }}</code> in
+        the URL.
+      </p>
+      <p>Example:</p>
+      <div class="example-code">
+        <code>{{ domain }}css?family=Montserrat:400,700</code>
+      </div>
+    </main>
+    <footer class="text-center py-4">
+      <p>
+        Brought to you by <a href="https://private.coffee">Private.coffee</a>
+      </p>
+    </footer>
+    <script src="https://nobsdelivr.private.coffee/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"></script>
+  </body>
+</html>