Initial commit for Hugging Face Space

Dockerfile

@@ -0,0 +1,33 @@
+
+# Use Python 3.9 as base (stable for WeasyPrint)
+FROM python:3.9-slim
+
+# 1. Install System Dependencies (The "Construction Team")
+# We install Pango, Cairo, and fonts for CJK support
+RUN apt-get update && apt-get install -y \
+    libpango-1.0-0 \
+    libpangoft2-1.0-0 \
+    libharfbuzz-subset0 \
+    libjpeg-dev \
+    libopenjp2-7-dev \
+    libxcb1 \
+    fontconfig \
+    fonts-noto-cjk \
+    && rm -rf /var/lib/apt/lists/*
+
+# 2. Set working directory
+WORKDIR /app
+
+# 3. Install Python Dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# 4. Copy Application Code
+COPY . .
+
+# 5. Expose Port (Hugging Face expects port 7860)
+EXPOSE 7860
+
+# 6. Run the Application
+# Using Gunicorn for production-grade performance
+CMD ["gunicorn", "-b", "0.0.0.0:7860", "app:app"]

README.md

@@ -0,0 +1,17 @@
+
+---
+title: Backend Service
+emoji: 🚀
+colorFrom: blue
+colorTo: purple
+sdk: docker
+app_port: 7860
+---
+# Universal Backend Service for Chrome Extensions
+
+This generic backend service provides:
+- **PDF Generation**: High-fidelity HTML-to-PDF conversion using WeasyPrint (with CJK font support).
+- **Extensible**: Ready to add more Python-based utilities.
+
+## Deployment
+Deployed via Docker on Hugging Face Spaces.

app.py

@@ -0,0 +1,58 @@
+
+from flask import Flask, request, send_file
+from weasyprint import HTML, CSS
+from weasyprint.text.fonts import FontConfiguration
+import io
+
+app = Flask(__name__)
+
+# Basic Health Check
+@app.route('/')
+def home():
+    return "Backend Service Running"
+
+@app.route('/api/generate_pdf', methods=['POST'])
+def generate_pdf():
+    try:
+        data = request.json
+        if not data or 'html' not in data:
+            return {"error": "Missing 'html' field"}, 400
+
+        html_content = data['html']
+        
+        # Prepare buffer
+        pdf_buffer = io.BytesIO()
+        
+        # Font Config (We rely on system fonts installed via Dockerfile)
+        # fonts-noto-cjk provides "Noto Sans CJK SC"
+        font_config = FontConfiguration()
+        
+        # CSS to enforce fonts
+        css = CSS(string='''
+            @page { margin: 20mm; }
+            body { font-family: "Noto Sans CJK SC", sans-serif !important; }
+            img { max-width: 100%; height: auto; }
+            pre { white-space: pre-wrap; background: #f5f5f5; padding: 10px; }
+        ''')
+
+        HTML(string=html_content).write_pdf(
+            pdf_buffer, 
+            stylesheets=[css], 
+            font_config=font_config
+        )
+        
+        pdf_buffer.seek(0)
+        
+        return send_file(
+            pdf_buffer,
+            mimetype='application/pdf',
+            as_attachment=True,
+            download_name='export.pdf'
+        )
+
+    except Exception as e:
+        print(f"Error: {e}")
+        return {"error": str(e)}, 500
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=7860)

requirements.txt

@@ -0,0 +1,4 @@
+
+Flask==3.0.0
+WeasyPrint==60.1
+gunicorn==21.2.0