BLockchain based E-voting example

examples/Blockchain-Based-E_voting/app(1).py

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+from flask import Flask, render_template, request, redirect, url_for, session
+import sqlite3
+from my_blockchain import Blockchain
+import cv2
+
+app = Flask(__name__)
+app.secret_key = "e-voting-secure-key"
+voting_chain = Blockchain()
+
+# Load face detection model
+face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")
+
+# Database Connection
+def get_db_connection():
+    conn = sqlite3.connect('voters.db')
+    conn.row_factory = sqlite3.Row
+    return conn
+
+# Home Route
+@app.route('/')
+def home():
+    return render_template('index.html')
+
+# Voter Authentication (Live Face Detection)
+@app.route('/login', methods=['POST'])
+def login():
+    voter_name = request.form['name']
+    
+    # Check voter in database
+    conn = get_db_connection()
+    cursor = conn.cursor()
+    cursor.execute("SELECT * FROM voters WHERE name=?", (voter_name,))
+    voter = cursor.fetchone()
+    conn.close()
+    
+    if voter:
+        # Start Face Verification
+        cap = cv2.VideoCapture(0)
+        verified = False
+
+        while True:
+            ret, frame = cap.read()
+            if not ret:
+                break
+
+            gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
+            faces = face_cascade.detectMultiScale(gray, scaleFactor=1.1, minNeighbors=5, minSize=(100, 100))
+
+            if len(faces) > 0:
+                verified = True
+                break
+
+            cv2.imshow("Face Verification - Press 'Q' to Exit", frame)
+            if cv2.waitKey(1) & 0xFF == ord('q'):
+                break
+
+        cap.release()
+        cv2.destroyAllWindows()
+
+        if verified:
+            session['voter_name'] = voter_name
+            return redirect(url_for('vote'))
+        else:
+            return "❌ Face Verification Failed! Try Again."
+
+    return "❌ Voter Not Found! Please Register First."
+
+# Voting Page
+@app.route('/vote', methods=['GET', 'POST'])
+def vote():
+    if 'voter_name' not in session:
+        return redirect(url_for('home'))
+
+    if request.method == 'POST':
+        vote_choice = request.form['vote']
+        voter_name = session['voter_name']
+
+        voting_chain.add_vote(voter_name, vote_choice)
+        session.pop('voter_name', None)
+
+        return redirect(url_for('results'))
+
+    return render_template('vote.html')
+
+# Results Page
+@app.route('/results')
+def results():
+    vote_counts = {}
+    for block in voting_chain.chain[1:]:
+        vote = block['vote']
+        vote_counts[vote] = vote_counts.get(vote, 0) + 1
+
+    return render_template('results.html', votes=vote_counts)
+
+# Run Flask App
+if __name__ == '__main__':
+    app.run(debug=True)