Offline mode implemented

README

@@ -16,6 +16,7 @@ similar third-party projects.
 * Sending TRX/USDT/USDC on all supported networks
 * Freezing (for energy) and unfreezing TRX on all supported networks
 * Ability to connect to custom nodes or TronGrid API (with your own API key)
+* Offline mode for send/freeze/unfreeze transactions
 * No filesystem interaction (that's a feature, not a bug: see the FAQ section)
 * Full scriptability: send/freeze/unfreeze transactions require manual approval
   but it actually can be turned off with a special commandline parameter for the
@@ -145,9 +146,25 @@ Again, the amount of TRX is entered as a floating point value.
 
 Keep in mind that it takes up to 72 hours to unfreeze your TRX assets.
 
+-- Offline operations --
+
+The send trx, send usdt, send usdc, fre trx and unf trx subcommands support the
+-o flag that, after the "Success:" line, outputs a JSON of a signed transaction.
+You can copy or otherwise transfer this output to a different machine running
+kisstron and broadcast it to the network with bro trx subcommand:
+
+./kisstron.py bro trx [netopts]
+
+You can then paste the transaction JSON into the input field, press Enter and,
+unless -nc flag is passed too, confirm sending the transaction by entering yes.
+The transaction will be broadcast and processed as usual.
+
+Keep in mind that Tron transactions expire very quickly, so you have a limited
+time window between signing and publishing them.
+
 == FAQ ==
 
-- Can I trust it?
+- Can I trust this wallet?
 
 The author trusts it. In fact, kisstron was created because of lack of decent
 FOSS Tron wallets for Linux/BSD desktop operating systems. However, it cannot
@@ -179,9 +196,8 @@ No. The underlying tronpy library signs all transactions offline, so the
 private key never leaves your machine. It uses libsecp256k1 via coincurve
 library binding for transaction signing.
 
-Ability to implement offline mode (transactions are created and signed on one
+You can also use offline mode to split signing and sending transactions, as
-kisstron instance without Internet connectivity, then broadcast from another)
+shown in this document.
-in the future versions is being studied.
 
 - Why doesn't kisstron support TRC-10, multisig, witnesses, history etc?
 

kisstron.py

@@ -11,6 +11,7 @@
 # * ability to select testnets (nile, shasta) if necessary
 # * ability to connect to custom mainnet nodes if necessary
 # * switching to TronGrid API by providing your own API key
+# * offline mode with -o switch and bro[adcast] operation
 #
 # As of now, the main goal is to be able to operate on TRX and stablecoins.
 # For mnemonic phrase generation, only English is currently supported.
@@ -19,11 +20,14 @@
 #
 # Created by Luxferre in 2024, released into public domain
 
-import sys
+import sys, json
 from tronpy import Tron
+from tronpy.tron import Transaction
 from tronpy.keys import PrivateKey
 from tronpy.providers import HTTPProvider
-from tronpy.exceptions import BadAddress, AddressNotFound, BadKey, ValidationError
+from tronpy.exceptions import (BadAddress, AddressNotFound,
+  BadKey, ValidationError, TransactionError)
+from json.decoder import JSONDecodeError
 import mnemonic, eth_utils
 
 # some global parameters (hardcoded)
@@ -258,7 +262,8 @@ def infobypk(network: str, pk: str):
 # send TRX transaction (and wait for its completion)
 # input: network, private key, target address, amount (in TRX)
 # output: transaction receipt object
-def sendtrx(network: str, pk: str, toaddr: str, amt: float):
+def sendtrx(network: str, pk: str, toaddr: str, amt: float,
+            offline: bool = False):
   res = {'success': False, 'message': '', 'result': {}}
   if amt < 1:
     res['message'] = 'Nothing to transfer!'
@@ -273,11 +278,15 @@ def sendtrx(network: str, pk: str, toaddr: str, amt: float):
   # build and sign the transaction
   txn = client.trx.transfer(fromaddr, toaddr,
           int(amt * TRX_SCALE)).build().sign(rpk)
-  # send the transaction
+  if offline == True: # generate transaction JSON
+    res['success'] = True
+    res['result'] = txn
+    res['message'] = json.dumps(txn.to_json(), separators=(',', ':'))
+  else: # send the transaction
     try:
       receipt = txn.broadcast().wait()
-  except ValidationError:
+    except ValidationError as e:
-    res['message'] = 'Insufficient balance or other validation error!'
+      res['message'] = str(e)
       return res
     res['success'] = True
     res['message'] = 'Sent %f TRX to %s\nTransaction ID %s' % (amt, 
@@ -288,7 +297,8 @@ def sendtrx(network: str, pk: str, toaddr: str, amt: float):
 # send TRC20 token transaction (and wait for its completion)
 # input: network, private key, token ticker, target address, amount (in tokens)
 # output: transaction receipt object
-def sendtrc20(network: str, pk: str, ticker: str, toaddr: str, amt: float):
+def sendtrc20(network: str, pk: str, ticker: str, toaddr: str,
+              amt: float, offline: bool = False):
   res = {'success': False, 'message': '', 'result': {}}
   ticker = ticker.lower()
   if ticker not in KT_TRC20_TOKENS[network]:
@@ -312,11 +322,15 @@ def sendtrc20(network: str, pk: str, ticker: str, toaddr: str, amt: float):
   # build and sign the transaction
   txn = cntr.functions.transfer(toaddr,
           int(amt * scaler)).with_owner(fromaddr).build().sign(rpk)
-  # send the transaction
+  if offline == True: # generate transaction JSON
+    res['success'] = True
+    res['result'] = txn
+    res['message'] = json.dumps(txn.to_json(), separators=(',', ':'))
+  else: # send the transaction
     try:
       receipt = txn.broadcast().wait()
-  except ValidationError:
+    except ValidationError as e:
-    res['message'] = 'Insufficient balance or other validation error!'
+      res['message'] = str(e)
       return res
     res['result'] = receipt
     if receipt['receipt']['result'] == 'OUT_OF_ENERGY':
@@ -331,7 +345,7 @@ def sendtrc20(network: str, pk: str, ticker: str, toaddr: str, amt: float):
 # freeze TRX for energy (and wait for its completion)
 # input: network, private key, amount
 # output: transaction receipt object
-def freezetrx(network: str, pk: str, amt: float):
+def freezetrx(network: str, pk: str, amt: float, offline: bool = False):
   res = {'success': False, 'message': '', 'result': {}}
   if amt < 1:
     res['message'] = 'Nothing to freeze!'
@@ -346,11 +360,15 @@ def freezetrx(network: str, pk: str, amt: float):
   # build and sign the transaction
   txn = client.trx.freeze_balance(myaddr, int(amt * TRX_SCALE),
           "ENERGY").build().sign(rpk)
-  # send the transaction
+  if offline == True: # generate transaction JSON
+    res['success'] = True
+    res['result'] = txn
+    res['message'] = json.dumps(txn.to_json(), separators=(',', ':'))
+  else: # send the transaction
     try:
       receipt = txn.broadcast().wait()
-  except ValidationError:
+    except ValidationError as e:
-    res['message'] = 'Insufficient balance or other validation error!'
+      res['message'] = str(e)
       return res
     res['success'] = True
     res['message'] = 'Frozen %f TRX at %s\nTransaction ID %s' % (amt, 
@@ -361,7 +379,7 @@ def freezetrx(network: str, pk: str, amt: float):
 # unfreeze TRX for energy (and wait for its completion)
 # input: network, private key, amount
 # output: transaction receipt object
-def unfreezetrx(network: str, pk: str, amt: float):
+def unfreezetrx(network: str, pk: str, amt: float, offline: bool = False):
   res = {'success': False, 'message': '', 'result': {}}
   if amt < 1:
     res['message'] = 'Nothing to unfreeze!'
@@ -377,11 +395,15 @@ def unfreezetrx(network: str, pk: str, amt: float):
   txn = client.trx.unfreeze_balance(owner = myaddr,
           unfreeze_balance = int(amt * TRX_SCALE),
           resource = "ENERGY").build().sign(rpk)
-  # send the transaction
+  if offline == True: # generate transaction JSON
+    res['success'] = True
+    res['result'] = txn
+    res['message'] = json.dumps(txn.to_json(), separators=(',', ':'))
+  else: # send the transaction
     try:
       receipt = txn.broadcast().wait()
-  except ValidationError:
+    except ValidationError as e:
-    res['message'] = 'Insufficient balance or other validation error!'
+      res['message'] = str(e)
       return res
     res['success'] = True
     res['message'] = 'Unfrozen %f TRX at %s\nTransaction ID %s' % (amt, 
@@ -389,10 +411,42 @@ def unfreezetrx(network: str, pk: str, amt: float):
     res['result'] = receipt
   return res
 
+# Broadcast transaction JSON saved in kisstron offline mode
+# input: network, transaction JSON string
+# output: transaction receipt object
+def broadcastjson(network, tjson):
+  res = {'success': False, 'message': '', 'result': {}}
+  # import the transaction from JSON
+  try:
+    txn = Transaction.from_json(json.loads(tjson))
+  except (TypeError, ValidationError, TransactionError,
+          JSONDecodeError, KeyError):
+    res['message'] = 'Malformed transaction JSON!'
+    return res
+  # instantiate a client for the transaction
+  txn._client = tronclient(network)
+  # send the transaction
+  try:
+    receipt = txn.broadcast().wait()
+  except ValidationError as e:
+    res['message'] = str(e)
+    return res
+  except TransactionError as e:
+    res['message'] = str(e)
+    return res
+  res['result'] = receipt
+  if ('receipt' in receipt and 'result' in receipt['receipt'] 
+        and receipt['receipt']['result'] == 'OUT_OF_ENERGY'):
+    res['message'] = 'Not enough energy for transaction!'
+    return res
+  res['success'] = True
+  res['message'] = 'Transaction sent\nTransaction ID %s' % receipt['id']
+  return res
+
 if __name__ == '__main__': # main app start
   from argparse import ArgumentParser
   parser = ArgumentParser(description='kisstron: a simple CLI wallet for Tron blockchain', epilog='(c) Luxferre 2024 --- No rights reserved <https://unlicense.org>')
-  parser.add_argument('op', help='Operation: new, import, info, send, fre[eze], unf[reeze]')
+  parser.add_argument('op', help='Operation: new, import, info, send, fre[eze], unf[reeze], bro[adcast]')
   parser.add_argument('coin', help='Coin to operate on: trx (default), usdt, usdc', default='trx')
   parser.add_argument('-net', '--network', default='mainnet', help='(op: all) Network: mainnet (default), nile, shasta')
   parser.add_argument('-node', '--tron-node', default=NODE_ADDR, help='(op: all) Custom Tron node HTTP address (default %s)' % NODE_ADDR)
@@ -400,6 +454,7 @@ if __name__ == '__main__': # main app start
   parser.add_argument('-addr', '--address', default=None, help='(op: info, send) Tron address to send to or display information about (-pk overrides this to display own info)')
   parser.add_argument('-amt', '--amount', type=float, default=0, help='(op: send, fre, unf) Amount to send/freeze/unfreeze')
   parser.add_argument('-pk', '--private-key', default=None, help='(op: info, send, fre, unf) Private key for transactions or own information, in hex')
+  parser.add_argument('-o', '--offline', action='store_true', help='(op: send, fre, unf) Build and sign the transaction in offline mode and output its JSON')
   parser.add_argument('-pp', '--passphrase', default='', help='(op: new, import) Mnemonic encryption passphrase (default empty)')
   parser.add_argument('-wc', '--words-count', type=int, default=12, help='(op: new) Word count in the mnemonic: 12 (default), 15, 18, 21, 24')
   parser.add_argument('-dp', '--derivation-path', default="m/44'/195'/0'/0/0", help="(op: new, import) BIP-39 derivation path for mnemonic (default is m/44'/195'/0'/0/0)")
@@ -420,6 +475,9 @@ if __name__ == '__main__': # main app start
   trans_confirm = True            # ask for transaction confirmation ("yes") 
   NODE_ADDR = args.tron_node      # custom Tron node HTTP address
   TG_API_KEY = args.trongrid_api_key # optional TronGrid API key
+  offline_mode = False            # offline mode
+  if args.offline == True:
+    offline_mode = True
   if args.no_confirm == True:
     trans_confirm = False
 
@@ -432,6 +490,9 @@ if __name__ == '__main__': # main app start
     mnemo = input('Your mnemonic phrase: ')
     opres = importwallet(tronnet, mnemo, passphrase, dpath)
   elif op == 'info': # info on own or foreign address
+    if offline_mode == True:
+      print('Info operation is not available in offline mode!')
+      sys.exit(1)
     if pk == None: # public info, address must be set
       opres = infobyaddr(tronnet, targetaddr)  
     else: # own info, private key must be set
@@ -440,17 +501,25 @@ if __name__ == '__main__': # main app start
     if trans_confirm == True:
       trconfirm('Enter "yes" to confirm sending funds: ')
     if coin == 'trx': # send TRX
-      opres = sendtrx(tronnet, pk, targetaddr, amount)
+      opres = sendtrx(tronnet, pk, targetaddr, amount, offline_mode)
     else: # send one of the predefined TRC20 tokens
-      opres = sendtrc20(tronnet, pk, coin, targetaddr, amount)
+      opres = sendtrc20(tronnet, pk, coin, targetaddr, amount, offline_mode)
   elif op == 'fre' or op == 'freeze': # freeze TRX for energy
     if trans_confirm == True:
       trconfirm('Enter "yes" to confirm freezing funds: ')
-    opres = freezetrx(tronnet, pk, amount)
+    opres = freezetrx(tronnet, pk, amount, offline_mode)
   elif op == 'unf' or op == 'unfreeze': # unfreeze TRX
     if trans_confirm == True:
       trconfirm('Enter "yes" to confirm unfreezing funds: ')
-    opres = unfreezetrx(tronnet, pk, amount)
+    opres = unfreezetrx(tronnet, pk, amount, offline_mode)
+  elif op == 'bro' or op == 'broadcast': # broadcast signed JSON transaction
+    if offline_mode == True:
+      print('Broadcast operation is not available in offline mode!')
+      sys.exit(1)
+    transjson = input('Input transaction JSON: ')
+    if trans_confirm == True:
+      trconfirm('Enter "yes" to confirm sending the transaction: ')
+    opres = broadcastjson(tronnet, transjson)
   else: # unknown operation
     print('Unknown operation!')
     print('Run the script with -h parameter to see available options')