v. 1
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commit
d8e8636705
GPG key ID:
7F01AE38128DA30D
2
.gitignore
vendored
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.gitignore
vendored
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venv/
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blockchain.json
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158
blockchain.py
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blockchain.py
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import hashlib
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import json
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import base64
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import os
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import requests
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from datetime import datetime
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from flask import Flask, jsonify, request, render_template, flash, redirect, url_for
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class Block:
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def __init__(self, index, timestamp, data, previous_hash):
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self.index = index
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self.timestamp = timestamp
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self.data = data
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self.previous_hash = previous_hash
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self.hash = self.calculate_hash()
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def calculate_hash(self):
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data_string = json.dumps(self.data, sort_keys=True)
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return hashlib.sha256((str(self.index) + self.timestamp + data_string + self.previous_hash).encode()).hexdigest()
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class Blockchain:
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def __init__(self):
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self.chain = []
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self.load_chain()
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def create_genesis_block(self):
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return Block(0, "00-00-0000", "Genesis Block", "0")
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def get_latest_block(self):
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return self.chain[-1]
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def add_block(self, new_block):
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new_block.previous_hash = self.get_latest_block().hash
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new_block.hash = new_block.calculate_hash()
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self.chain.append(new_block)
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self.save_chain()
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def load_chain(self):
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if os.path.exists('blockchain.json'):
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with open('blockchain.json', 'r') as file:
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chain_data = json.load(file)
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for block_data in chain_data:
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block = Block(block_data['index'], block_data['timestamp'], block_data['data'], block_data['previous_hash'])
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block.hash = block_data['hash']
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self.chain.append(block)
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else:
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self.chain.append(self.create_genesis_block())
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def save_chain(self):
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chain_data = []
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for block in self.chain:
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chain_data.append({
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'index': block.index,
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'timestamp': block.timestamp,
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'data': block.data,
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'previous_hash': block.previous_hash,
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'hash': block.hash
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})
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with open('blockchain.json', 'w') as file:
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json.dump(chain_data, file)
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def is_chain_valid(self):
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for i in range(1, len(self.chain)):
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current_block = self.chain[i]
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previous_block = self.chain[i - 1]
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if current_block.hash != current_block.calculate_hash():
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return False
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if current_block.previous_hash != previous_block.hash:
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return False
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return True
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app = Flask(__name__)
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app.secret_key = 'lesecretkey'
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blockchain = Blockchain()
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CONNECTED_NODES = []
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@app.route('/')
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def index():
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return render_template('index.html')
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@app.route('/upload', methods=['POST'])
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def upload_image():
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file = request.files['image']
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image_data = base64.b64encode(file.read()).decode('utf-8')
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current_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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block = Block(len(blockchain.chain), current_time, image_data, blockchain.get_latest_block().hash)
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blockchain.add_block(block)
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if blockchain.is_chain_valid():
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flash('Image uploaded successfully', 'success')
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else:
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flash('Corrupted blocks detected. Image upload failed.', 'danger')
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blockchain.chain.pop()
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return redirect(url_for('index'))
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@app.route('/chain', methods=['GET'])
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def get_chain():
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chain_data = []
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for block in blockchain.chain:
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chain_data.append({
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'index': block.index,
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'timestamp': block.timestamp,
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'data': block.data,
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'previous_hash': block.previous_hash,
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'hash': block.hash
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})
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return jsonify(chain_data)
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@app.route('/register_node', methods=['POST'])
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def register_node():
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node_url = request.form['node_url']
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if not node_url.startswith('http://') and not node_url.startswith('https://'):
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node_url = 'http://' + node_url
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if node_url not in CONNECTED_NODES:
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CONNECTED_NODES.append(node_url)
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return redirect(url_for('index'))
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@app.route('/sync_chain', methods=['GET'])
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def sync_chain():
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longest_chain = None
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current_len = len(blockchain.chain)
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for node_url in CONNECTED_NODES:
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response = requests.get(f'{node_url}/chain')
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if response.status_code == 200:
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chain_data = response.json()
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chain_len = len(chain_data)
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if chain_len > current_len:
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current_len = chain_len
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longest_chain = chain_data
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if longest_chain:
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blockchain.chain = [Block(block['index'], block['timestamp'], block['data'], block['previous_hash']) for block in longest_chain]
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blockchain.save_chain()
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flash('Blockchain synchronized successfully', 'success')
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else:
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flash('Blockchain is already up to date', 'info')
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return redirect(url_for('index'))
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@app.route('/validate', methods=['GET'])
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def validate_blockchain():
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is_valid = blockchain.is_chain_valid()
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if is_valid:
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return jsonify({"message": "Blockchain is valid"})
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else:
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return jsonify({"message": "Blockchain is invalid"}), 400
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@app.route('/nodes', methods=['GET'])
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def get_nodes():
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return jsonify(CONNECTED_NODES)
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if __name__ == '__main__':
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app.run(host='0.0.0.0', port=5000, debug=True)
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2
requirements.txt
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2
requirements.txt
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requests
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flask
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81
templates/index.html
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81
templates/index.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Memechain</title>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
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</head>
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<body>
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<div class="container">
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<h1>Memechain</h1>
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<em>your glorified nfts or something</em>
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{% with messages = get_flashed_messages(with_categories=true) %}
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{% if messages %}
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{% for category, message in messages %}
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<div style="margin-top: 16px;" class="alert alert-{{ category }}" role="alert">
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{{ message }}
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</div>
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{% endfor %}
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{% endif %}
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{% endwith %}
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<form action="/upload" method="post" enctype="multipart/form-data">
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<div class="form-group">
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<label for="image">Select Image:</label>
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<input type="file" class="form-control-file" id="image" name="image" accept="image/*" required>
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</div>
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<button type="submit" class="btn btn-primary">Upload</button>
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</form>
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<hr>
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<h2>Connected Nodes</h2>
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<form action="/register_node" method="post">
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<div class="form-group">
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<label for="node_url">Node URL:</label>
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<input type="text" class="form-control" id="node_url" name="node_url" required>
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</div>
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<button type="submit" class="btn btn-primary">Connect Node</button>
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</form>
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<ul id="node-list" class="list-group mt-3"></ul>
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<hr>
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<a href="/sync_chain" class="btn btn-primary">Sync Blockchain</a>
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<hr>
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<h2>Blockchain</h2>
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<div id="blockchain"></div>
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</div>
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<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
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<script>
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fetch('/chain')
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.then(response => response.json())
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.then(data => {
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const blockchainDiv = document.getElementById('blockchain');
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data.forEach(block => {
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const blockDiv = document.createElement('div');
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blockDiv.innerHTML = `
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<p>Index: ${block.index}</p>
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<p>Timestamp: ${block.timestamp}</p>
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<p>Image: <img style="height: 50%; width: 50%;" src="data:image/png;base64,${block.data}" alt="Block Image"></p>
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<p>Previous Hash: ${block.previous_hash}</p>
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<p>Hash: ${block.hash}</p>
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<hr>
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`;
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blockchainDiv.appendChild(blockDiv);
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});
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});
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fetch('/nodes')
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.then(response => response.json())
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.then(nodes => {
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const nodeList = document.getElementById('node-list');
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nodes.forEach(node => {
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const listItem = document.createElement('li');
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listItem.textContent = node;
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listItem.classList.add('list-group-item');
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nodeList.appendChild(listItem);
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});
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});
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</script>
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</body>
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</html>
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