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import streamlit as st
import hashlib
import json
import time
# Blockchain Class
class Blockchain:
def __init__(self):
self.chain = []
self.voters = set()
self.load_data()
if not self.chain:
self.create_genesis_block()
def create_genesis_block(self):
"""Creates the first block in the blockchain."""
genesis_block = {
"index": 1,
"timestamp": time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),
"votes": {},
"previous_hash": "0",
"hash": self.hash_block({}, "0"),
}
self.chain.append(genesis_block)
self.save_data()
def create_block(self, votes, previous_hash):
block = {
"index": len(self.chain) + 1,
"timestamp": time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),
"votes": votes,
"previous_hash": previous_hash,
"hash": self.hash_block(votes, previous_hash),
}
self.chain.append(block)
self.save_data()
return block
def hash_block(self, votes, previous_hash):
block_string = json.dumps(votes, sort_keys=True) + previous_hash
return hashlib.sha256(block_string.encode()).hexdigest()
def get_latest_block(self):
return self.chain[-1] if self.chain else None
def save_data(self):
with open("votes.json", "w") as f:
json.dump({"chain": self.chain, "voters": list(self.voters)}, f, indent=4)
def load_data(self):
try:
with open("votes.json", "r") as f:
data = json.load(f)
self.chain = data.get("chain", [])
self.voters = set(data.get("voters", []))
except FileNotFoundError:
self.chain = []
self.voters = set()
# Initialize Blockchain
blockchain = Blockchain()
# Set page config
st.set_page_config(page_title="Blockchain Voting", page_icon="🗳", layout="wide")
st.markdown("<h1>🗳 Secure Blockchain-Based Voting System</h1>", unsafe_allow_html=True)
# Sidebar for Voter Input
st.sidebar.header("🔐 Voter Authentication")
voter_id = st.sidebar.text_input("🔑 Enter your Unique Voter ID:", max_chars=10)
# Hash the voter ID for security
def hash_voter_id(voter_id):
return hashlib.sha256(voter_id.encode()).hexdigest()
# Candidate Selection
st.sidebar.header("🗳 Vote Now")
candidates = ["BJP", "Shiv Sena", "NCP", "NOTA"]
selected_candidate = st.sidebar.radio("Select your candidate:", candidates)
# Voting Button
if st.sidebar.button("✅ Submit Vote"):
if not voter_id:
st.sidebar.warning("⚠ Please enter a valid Voter ID!")
else:
voter_hash = hash_voter_id(voter_id) # Hash voter ID
if voter_hash in blockchain.voters:
st.sidebar.error("❌ You have already voted!")
else:
last_block = blockchain.get_latest_block()
new_votes = last_block["votes"].copy() if last_block else {}
new_votes[selected_candidate] = new_votes.get(selected_candidate, 0) + 1
blockchain.create_block(new_votes, last_block["hash"] if last_block else "0")
blockchain.voters.add(voter_hash) # Store hashed ID
blockchain.save_data()
st.sidebar.success(f"✅ Vote cast for {selected_candidate}!")
# Display Vote Count
st.markdown("<h2 style='text-align: center; color:#ffcc00;'>📊 Live Vote Count</h2>", unsafe_allow_html=True)
latest_block = blockchain.get_latest_block()
if latest_block:
with st.container():
col1, col2, col3, col4 = st.columns(4)
vote_data = latest_block["votes"]
col1.metric(label="🔹 BJP", value=vote_data.get("BJP", 0))
col2.metric(label="🔹 Shiv Sena", value=vote_data.get("Shiv Sena", 0))
col3.metric(label="🔹 NCP", value=vote_data.get("NCP", 0))
col4.metric(label="🔹 NOTA", value=vote_data.get("NOTA", 0))
# Show Blockchain Data
if st.checkbox("📜 View Blockchain Data"):
st.json(blockchain.chain) |