Ask user to confirm making new wallet

Warns users before they generate a new single wallet, which will erase
the old one. Also stores the addresses and keys in sessionStorage in
case it needs to be recovered.

bitaddress.org.html

@@ -9591,12 +9591,22 @@ ninja.wallets.singlewallet = {
 
 	// generate bitcoin address and private key and update information in the HTML
 	generateNewAddressAndKey: function () {
+		this.generate = function () {
+			if ( document.getElementById("qrcode_private").innerHTML.length && window.sessionStorage ) {
+				window.sessionStorage.previous_address = document.getElementById("btcaddress").innerHTML
+				window.sessionStorage.previous_private_key = document.getElementById("btcprivwif").innerHTML
+			}
+
 			try {
 				var key = new Bitcoin.ECKey(false);
 				var bitcoinAddress = key.getBitcoinAddress();
 				var privateKeyWif = key.getBitcoinWalletImportFormat();
 				document.getElementById("btcaddress").innerHTML = bitcoinAddress;
 				document.getElementById("btcprivwif").innerHTML = privateKeyWif;
+
+				window.sessionStorage.newest_address = bitcoinAddress
+				window.sessionStorage.newest_private_key = privateKeyWif
+
 				var keyValuePair = {
 					"qrcode_public": bitcoinAddress,
 					"qrcode_private": privateKeyWif
@@ -9611,6 +9621,14 @@ ninja.wallets.singlewallet = {
 				document.getElementById("qrcode_public").innerHTML = "";
 				document.getElementById("qrcode_private").innerHTML = "";
 			}
+
+		}
+
+		if ( document.getElementById("qrcode_private").innerHTML.length ) {
+			if ( confirm( "WARNING: This will permanently erase the current private key that is on the screen. If you have not saved this private key, press cancel now!" ) ) {
+				return this.generate()
+			} else return
+		} else return this.generate()
 	}
 };
 	</script>

src/ninja.singlewallet.js

@@ -16,12 +16,22 @@ ninja.wallets.singlewallet = {
 
 	// generate bitcoin address and private key and update information in the HTML
 	generateNewAddressAndKey: function () {
+		this.generate = function () {
+			if ( document.getElementById("qrcode_private").innerHTML.length && window.sessionStorage ) {
+				window.sessionStorage.previous_address = document.getElementById("btcaddress").innerHTML
+				window.sessionStorage.previous_private_key = document.getElementById("btcprivwif").innerHTML
+			}
+
 			try {
 				var key = new Bitcoin.ECKey(false);
 				var bitcoinAddress = key.getBitcoinAddress();
 				var privateKeyWif = key.getBitcoinWalletImportFormat();
 				document.getElementById("btcaddress").innerHTML = bitcoinAddress;
 				document.getElementById("btcprivwif").innerHTML = privateKeyWif;
+
+				window.sessionStorage.newest_address = bitcoinAddress
+				window.sessionStorage.newest_private_key = privateKeyWif
+
 				var keyValuePair = {
 					"qrcode_public": bitcoinAddress,
 					"qrcode_private": privateKeyWif
@@ -36,5 +46,13 @@ ninja.wallets.singlewallet = {
 				document.getElementById("qrcode_public").innerHTML = "";
 				document.getElementById("qrcode_private").innerHTML = "";
 			}
+
+		}
+
+		if ( document.getElementById("qrcode_private").innerHTML.length ) {
+			if ( confirm( "WARNING: This will permanently erase the current private key that is on the screen. If you have not saved this private key, press cancel now!" ) ) {
+				return this.generate()
+			} else return
+		} else return this.generate()
 	}
 };