Raise ValueError on invalid Bitcoin amount strings

jmbitcoin/jmbitcoin/amount.py

@@ -1,4 +1,5 @@
 from decimal import Decimal
+import re
 
 
 def btc_to_sat(btc):
@@ -19,7 +20,10 @@ def sat_to_btc(sat):
 
 
 def amount_to_sat(amount_str):
-    amount_str = str(amount_str)
+    amount_str = str(amount_str).strip()
+    if re.compile("^[0-9]{1,8}(\.)?([0-9]{1,8})?(btc|sat)?$").match(
+                  amount_str.lower()) is None:
+        raise ValueError("Invalid BTC amount string " + amount_str)
     if amount_str.lower().endswith("btc"):
         return int(btc_to_sat(amount_str[:-3]))
     elif amount_str.lower().endswith("sat"):

jmbitcoin/test/test_amounts.py

@@ -24,6 +24,10 @@ def test_amount_to_sat():
     assert(btc.amount_to_sat("1.12300000sat") == 1)
     assert(btc.amount_to_sat("1btc") == 100000000)
     assert(btc.amount_to_sat("1BTC") == 100000000)
+    with pytest.raises(ValueError):
+        btc.amount_to_sat("")
+        btc.amount_to_sat("invalidamount")
+        btc.amount_to_sat("123inv")
 
 
 def test_amount_to_btc():
@@ -37,6 +41,10 @@ def test_amount_to_btc():
     assert(btc.amount_to_btc("1.12300000sat") == Decimal("0.00000001"))
     assert(btc.amount_to_btc("1btc") == 1)
     assert(btc.amount_to_btc("1BTC") == 1)
+    with pytest.raises(ValueError):
+        btc.amount_to_btc("")
+        btc.amount_to_btc("invalidamount")
+        btc.amount_to_btc("123inv")
 
 
 def test_amount_to_sat_str():
@@ -50,6 +58,10 @@ def test_amount_to_sat_str():
     assert(btc.amount_to_sat_str("1.12300000sat") == "1 sat")
     assert(btc.amount_to_sat_str("1btc") == "100000000 sat")
     assert(btc.amount_to_sat_str("1BTC") == "100000000 sat")
+    with pytest.raises(ValueError):
+        btc.amount_to_sat_str("")
+        btc.amount_to_sat_str("invalidamount")
+        btc.amount_to_sat_str("123inv")
 
 
 def test_amount_to_btc_str():
@@ -63,6 +75,10 @@ def test_amount_to_btc_str():
     assert(btc.amount_to_btc_str("1.12300000sat") == "0.00000001 BTC")
     assert(btc.amount_to_btc_str("1btc") == "1.00000000 BTC")
     assert(btc.amount_to_btc_str("1BTC") == "1.00000000 BTC")
+    with pytest.raises(ValueError):
+        btc.amount_to_btc_str("")
+        btc.amount_to_btc_str("invalidamount")
+        btc.amount_to_btc_str("123inv")
 
 
 def test_amount_to_str():
@@ -76,6 +92,10 @@ def test_amount_to_str():
     assert(btc.amount_to_str("1.12300000sat") == "0.00000001 BTC (1 sat)")
     assert(btc.amount_to_str("1btc") == "1.00000000 BTC (100000000 sat)")
     assert(btc.amount_to_str("1BTC") == "1.00000000 BTC (100000000 sat)")
+    with pytest.raises(ValueError):
+        btc.amount_to_str("")
+        btc.amount_to_str("invalidamount")
+        btc.amount_to_str("123inv")
 
 
 def test_sat_to_str():

scripts/joinmarket-qt.py

@@ -128,7 +128,11 @@ def checkAddress(parent, addr):
 def checkAmount(parent, amount_str):
     if not amount_str:
         return False
-    amount_sat = btc.amount_to_sat(amount_str)
+    try:
+        amount_sat = btc.amount_to_sat(amount_str)
+    except ValueError as e:
+        JMQtMessageBox(parent, e.args[0], title="Error", mbtype="warn")
+        return False
     if amount_sat < DUST_THRESHOLD:
         JMQtMessageBox(parent,
                        "Amount " + btc.amount_to_str(amount_sat) +
@@ -644,7 +648,11 @@ class SpendTab(QWidget):
             return
 
         destaddr = str(self.addressInput.text().strip())
-        amount = btc.amount_to_sat(self.amountInput.text())
+        try:
+            amount = btc.amount_to_sat(self.amountInput.text())
+        except ValueError as e:
+            JMQtMessageBox(parent, e.args[0], title="Error", mbtype="warn")
+            return
         makercount = int(self.numCPInput.text())
         mixdepth = int(self.mixdepthInput.text())