File size: 19,000 Bytes
635881c |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 |
# blockchain_utils_metamask.py
import hashlib
import json
import os
import time
import streamlit as st
from web3 import Web3
class BlockchainManagerMetaMask:
def __init__(self,
contract_address=None,
network_id=None):
"""
Initialize blockchain connection for MetaMask integration.
Args:
contract_address: Address of the deployed RAG Document Verifier contract
network_id: Network ID from MetaMask (e.g., '1' for Ethereum Mainnet)
"""
self.contract_address = contract_address
self.network_id = network_id
# MetaMask connection status
self.is_connected = False
self.user_address = None
# Contract ABI - Load from file or define here
self.abi = [
{
"inputs": [],
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"anonymous": False,
"inputs": [
{
"indexed": True,
"internalType": "address",
"name": "user",
"type": "address"
},
{
"indexed": True,
"internalType": "string",
"name": "documentId",
"type": "string"
},
{
"indexed": False,
"internalType": "string",
"name": "documentHash",
"type": "string"
},
{
"indexed": False,
"internalType": "uint256",
"name": "timestamp",
"type": "uint256"
}
],
"name": "DocumentVerified",
"type": "event"
},
{
"anonymous": False,
"inputs": [
{
"indexed": True,
"internalType": "address",
"name": "user",
"type": "address"
},
{
"indexed": True,
"internalType": "string",
"name": "queryId",
"type": "string"
},
{
"indexed": False,
"internalType": "string",
"name": "queryHash",
"type": "string"
},
{
"indexed": False,
"internalType": "uint256",
"name": "timestamp",
"type": "uint256"
}
],
"name": "QueryLogged",
"type": "event"
},
{
"inputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"name": "documentHashes",
"outputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "string",
"name": "documentId",
"type": "string"
}
],
"name": "getDocumentHash",
"outputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "string",
"name": "queryId",
"type": "string"
}
],
"name": "getQueryInfo",
"outputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "string",
"name": "queryId",
"type": "string"
},
{
"internalType": "string",
"name": "queryHash",
"type": "string"
}
],
"name": "logQuery",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"name": "queryHashes",
"outputs": [
{
"internalType": "string",
"name": "",
"type": "string"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "string",
"name": "documentId",
"type": "string"
},
{
"internalType": "string",
"name": "documentHash",
"type": "string"
}
],
"name": "verifyDocument",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
}
]
# Flag to track if we're in a browser environment
self.is_browser_env = self._check_browser_environment()
# Generate JavaScript for web3 interaction with MetaMask
self.web3_js = self._generate_web3_js()
def _check_browser_environment(self):
"""Check if we're running in a browser environment."""
# This is a simplified check - in a real app, you'd detect this differently
return True
def _generate_web3_js(self):
"""Generate JavaScript code for MetaMask interaction."""
js_code = """
<script>
async function verifyDocumentWithMetaMask(documentId, documentHash) {
if (typeof window.ethereum === 'undefined') {
return {
status: false,
error: "MetaMask is not installed. Please install MetaMask and try again."
};
}
try {
// Request account access if needed
const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' });
const account = accounts[0];
// Create web3 instance
const web3 = new Web3(window.ethereum);
// Create contract instance
const contractABI = CONTRACT_ABI_PLACEHOLDER;
const contractAddress = 'CONTRACT_ADDRESS_PLACEHOLDER';
const contract = new web3.eth.Contract(contractABI, contractAddress);
// Prepare and send transaction
const tx = await contract.methods.verifyDocument(documentId, documentHash).send({
from: account
});
return {
status: true,
tx_hash: tx.transactionHash,
document_id: documentId,
document_hash: documentHash,
block_number: tx.blockNumber,
status_code: tx.status ? 1 : 0
};
} catch (error) {
console.error("Error verifying document:", error);
return {
status: false,
error: error.message
};
}
}
async function logQueryWithMetaMask(queryId, queryHash) {
if (typeof window.ethereum === 'undefined') {
return {
status: false,
error: "MetaMask is not installed. Please install MetaMask and try again."
};
}
try {
// Request account access if needed
const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' });
const account = accounts[0];
// Create web3 instance
const web3 = new Web3(window.ethereum);
// Create contract instance
const contractABI = CONTRACT_ABI_PLACEHOLDER;
const contractAddress = 'CONTRACT_ADDRESS_PLACEHOLDER';
const contract = new web3.eth.Contract(contractABI, contractAddress);
// Prepare and send transaction
const tx = await contract.methods.logQuery(queryId, queryHash).send({
from: account
});
return {
status: true,
tx_hash: tx.transactionHash,
query_id: queryId,
query_hash: queryHash,
block_number: tx.blockNumber,
status_code: tx.status ? 1 : 0
};
} catch (error) {
console.error("Error logging query:", error);
return {
status: false,
error: error.message
};
}
}
async function checkDocumentVerifiedWithMetaMask(documentId) {
if (typeof window.ethereum === 'undefined') {
return {
status: false,
error: "MetaMask is not installed. Please install MetaMask and try again."
};
}
try {
// Create web3 instance
const web3 = new Web3(window.ethereum);
// Create contract instance
const contractABI = CONTRACT_ABI_PLACEHOLDER;
const contractAddress = 'CONTRACT_ADDRESS_PLACEHOLDER';
const contract = new web3.eth.Contract(contractABI, contractAddress);
// Call the contract
const result = await contract.methods.getDocumentHash(documentId).call();
return {
status: true,
document_id: documentId,
document_hash: result,
is_verified: result !== ""
};
} catch (error) {
console.error("Error checking document:", error);
return {
status: false,
error: error.message
};
}
}
</script>
"""
# Replace placeholders with actual values
js_code = js_code.replace('CONTRACT_ABI_PLACEHOLDER', json.dumps(self.abi))
if self.contract_address:
js_code = js_code.replace('CONTRACT_ADDRESS_PLACEHOLDER', self.contract_address)
return js_code
def update_connection(self, is_connected, user_address=None, network_id=None):
"""Update the connection status with MetaMask info."""
self.is_connected = is_connected
self.user_address = user_address
if network_id:
self.network_id = network_id
def compute_file_hash(self, file_path):
"""
Compute the SHA-256 hash of a file.
Args:
file_path: Path to the file
Returns:
str: Hexadecimal hash of the file
"""
sha256_hash = hashlib.sha256()
with open(file_path, "rb") as f:
# Read and update hash in chunks for memory efficiency
for byte_block in iter(lambda: f.read(4096), b""):
sha256_hash.update(byte_block)
return sha256_hash.hexdigest()
def verify_document(self, document_id, file_path):
"""
Verify a document by storing its hash on the blockchain using MetaMask.
In a real Streamlit app, this would generate HTML/JS to call MetaMask.
For this example, we'll use placeholders.
Args:
document_id: Unique identifier for the document
file_path: Path to the document file
Returns:
dict: Transaction status info
"""
if not self.is_connected:
return {
"status": False,
"error": "MetaMask is not connected. Please connect your wallet first."
}
if not self.contract_address:
return {
"status": False,
"error": "Contract address is not set."
}
try:
# Compute document hash
document_hash = self.compute_file_hash(file_path)
# In a real app, we would use JavaScript to call MetaMask
# For this example, we'll return a simulated successful response
# Display MetaMask interaction info
st.info("Please confirm the transaction in your MetaMask wallet...")
# Simulate transaction process time
with st.spinner("Waiting for transaction confirmation..."):
time.sleep(3) # Simulate transaction time
# Simulate successful transaction
tx_hash = "0x" + "".join([format(i, "02x") for i in os.urandom(32)])
block_number = 12345678
return {
"status": True,
"tx_hash": tx_hash,
"document_id": document_id,
"document_hash": document_hash,
"block_number": block_number,
"status": 1 # Success
}
except Exception as e:
st.error(f"Error during verification: {str(e)}")
return {
"status": False,
"error": str(e)
}
def check_document_verified(self, document_id):
"""
Check if a document has already been verified on the blockchain.
Args:
document_id: Unique identifier for the document
Returns:
bool: True if document is verified, False otherwise
"""
if not self.is_connected:
st.warning("MetaMask not connected. Cannot check document verification status.")
return False
if not self.contract_address:
st.warning("Contract address not set. Cannot check document verification status.")
return False
# In a real app, we would use JavaScript to call the smart contract
# For this example, we'll return a simulated response
return False
def log_query(self, query_text, answer_text):
"""
Log a query and its answer on the blockchain.
Args:
query_text: The user's query
answer_text: The system's answer
Returns:
dict: Transaction status info
"""
if not self.is_connected:
return {
"status": False,
"error": "MetaMask is not connected. Please connect your wallet first."
}
if not self.contract_address:
return {
"status": False,
"error": "Contract address is not set."
}
try:
# Create a unique query ID using timestamp
query_id = f"query_{int(time.time())}"
# Create a JSON object with query and answer
query_data = {
"query": query_text,
"answer": answer_text,
"timestamp": int(time.time())
}
# Hash the query data
query_hash = hashlib.sha256(json.dumps(query_data).encode()).hexdigest()
# Display MetaMask interaction info
st.info("Please confirm the transaction in your MetaMask wallet...")
# Simulate transaction process time
with st.spinner("Waiting for transaction confirmation..."):
time.sleep(3) # Simulate transaction time
# Simulate successful transaction
tx_hash = "0x" + "".join([format(i, "02x") for i in os.urandom(32)])
block_number = 12345678
return {
"status": True,
"tx_hash": tx_hash,
"query_id": query_id,
"query_hash": query_hash,
"block_number": block_number,
"status": 1 # Success
}
except Exception as e:
st.error(f"Error during query logging: {str(e)}")
return {
"status": False,
"error": str(e)
}
def get_metamask_js(self):
"""Return the JavaScript code for MetaMask interaction."""
return self.web3_js |