Create app.py

app.py

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+import os
+import json
+import time
+from flask import Flask, render_template, request, redirect, url_for, session, flash
+from huggingface_hub import HfApi, hf_hub_download
+from werkzeug.security import generate_password_hash, check_password_hash
+from threading import Lock
+
+app = Flask(__name__)
+app.secret_key = os.environ.get("SECRET_KEY", "dev_key_change_this")
+
+# --- DATABASE CONFIG ---
+HF_TOKEN = os.environ.get("HF_TOKEN")
+DB_REPO = os.environ.get("DB_REPO") # e.g., "username/dataset-name"
+DB_FILE = "db.json"
+api = HfApi(token=HF_TOKEN)
+db_lock = Lock()
+
+# --- DATA STORAGE HELPER ---
+# We download the JSON DB at startup and upload it on every change
+def load_db():
+    try:
+        path = hf_hub_download(repo_id=DB_REPO, filename=DB_FILE, repo_type="dataset", token=HF_TOKEN)
+        with open(path, 'r') as f:
+            return json.load(f)
+    except:
+        # Initialize if not exists
+        return {"users": {}, "pins": []}
+
+def save_db(data):
+    with db_lock:
+        with open(DB_FILE, 'w') as f:
+            json.dump(data, f)
+        
+        # Push to HF Hub (This acts as your persistent storage)
+        api.upload_file(
+            path_or_fileobj=DB_FILE,
+            path_in_repo=DB_FILE,
+            repo_id=DB_REPO,
+            repo_type="dataset",
+            commit_message="Sync DB"
+        )
+
+# Initialize Local Cache of DB
+DATA_CACHE = load_db()
+
+# --- ROUTES ---
+
+@app.route('/')
+def index():
+    return render_template('index.html', pins=DATA_CACHE['pins'], user=session.get('user'))
+
+@app.route('/signup', methods=['POST'])
+def signup():
+    username = request.form['username']
+    password = request.form['password']
+    
+    if username in DATA_CACHE['users']:
+        flash("User already exists")
+        return redirect(url_for('index'))
+
+    DATA_CACHE['users'][username] = generate_password_hash(password)
+    save_db(DATA_CACHE)
+    session['user'] = username
+    return redirect(url_for('index'))
+
+@app.route('/login', methods=['POST'])
+def login():
+    username = request.form['username']
+    password = request.form['password']
+    
+    user_hash = DATA_CACHE['users'].get(username)
+    if user_hash and check_password_hash(user_hash, password):
+        session['user'] = username
+    else:
+        flash("Invalid credentials")
+    return redirect(url_for('index'))
+
+@app.route('/logout')
+def logout():
+    session.pop('user', None)
+    return redirect(url_for('index'))
+
+@app.route('/add_pin', methods=['POST'])
+def add_pin():
+    if 'user' not in session:
+        return redirect(url_for('index'))
+    
+    # User submits an Image URL (e.g., from Imgur or Unsplash)
+    img_url = request.form['img_url']
+    caption = request.form['caption']
+    
+    new_pin = {
+        "id": int(time.time()),
+        "url": img_url,
+        "caption": caption,
+        "author": session['user']
+    }
+    
+    DATA_CACHE['pins'].insert(0, new_pin) # Add to top
+    save_db(DATA_CACHE)
+    return redirect(url_for('index'))
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=7860)
+