Download | Gr 3108 Core Pdf
const downloadFile = async () => toggleUI(true); showMessage('Preparing download…');
| Layer | What it does | Technologies | |-------|--------------|---------------| | | Shows a “Download PDF” button, handles click, shows progress & error messages | HTML5, CSS3 (Bootstrap 5), vanilla JavaScript (or React/Angular snippet) | | Backend API | Serves the PDF from a secure location, validates request, logs the download, supports range requests for resumable downloads | Python + Flask (or Node + Express alternative) | | Infrastructure | Stores the PDF safely, configures caching & security headers, optional CDN fallback | Filesystem/Cloud storage (e.g., S3), Nginx reverse‑proxy, optional CloudFront/Cloudflare CDN | 1️⃣ Front‑End – “Download GR‑3108‑Core PDF” Component 1.1 HTML (Bootstrap 5) <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>GR‑3108 Core – PDF Download</title> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"> <style> .spinner-border-sm width: 1rem; height: 1rem; #downloadMsg min-height: 1.5rem; </style> </head> <body class="container py-5">
app = create_app()
def get_pdf_path(filename: str) -> str: """ Return an absolute, safe path to the requested PDF. Raises 404 if the file does not exist. """ root = current_app.config["PDF_ROOT"] safe_path = safe_join(root, filename) if not safe_path or not os.path.isfile(safe_path): abort(404, description="PDF not found.") return safe_path
// Cleanup a.remove(); window.URL.revokeObjectURL(url); gr 3108 core pdf download
return response from app import create_app
showMessage('✅ Download started.', 'success'); catch (err) console.error(err); showMessage(`❌ Failed: $err.message`, 'error'); finally toggleUI(false); ; if not request
# 4️⃣ Nginx reverse‑proxy (example /etc/nginx/sites‑available/gr3108.conf)
def create_app(): app = Flask(__name__) # ------------------------------ # App configuration (example) # ------------------------------ app.config.update( SECRET_KEY="replace‑with‑strong‑random‑bytes", PDF_ROOT="static/pdf", # folder where PDFs live PDF_MAX_AGE=86400, # 1 day browser cache ) # Register API blueprint app.register_blueprint(api_bp, url_prefix="/api/v1") return app import os from flask import current_app, abort, send_file, after_this_request from werkzeug.utils import safe_join from datetime import datetime, timedelta if not request.cookies.get("auth"): abort(401
# -------------------------------------------------------------------- # OPTIONAL: Replace with your own auth check (Flask‑Login, JWT, etc.) # -------------------------------------------------------------------- def login_required(fn): """Very light placeholder – raise 401 if no session.""" from functools import wraps @wraps(fn) def wrapper(*args, **kwargs): # Example: check a simple cookie; replace with real auth. if not request.cookies.get("auth"): abort(401, description="Authentication required.") return fn(*args, **kwargs) return wrapper