1 files changed, 67 insertions, 0 deletions
diff --git a/src/qt/bitcoinaddressvalidator.cpp b/src/qt/bitcoinaddressvalidator.cpp
new file mode 100644
index 0000000000..373877808f
--- /dev/null
+++ b/src/qt/bitcoinaddressvalidator.cpp
@@ -0,0 +1,67 @@
+#include "bitcoinaddressvalidator.h"
+
+/* Base58 characters are:
+     "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
+
+  This is:
+  - All numbers except for '0'
+  - All uppercase letters except for 'I' and 'O'
+  - All lowercase letters except for 'l'
+
+  User friendly Base58 input can map
+  - 'l' and 'I' to '1'
+  - '0' and 'O' to 'o'
+*/
+
+BitcoinAddressValidator::BitcoinAddressValidator(QObject *parent) :
+    QValidator(parent)
+{
+}
+
+QValidator::State BitcoinAddressValidator::validate(QString &input, int &pos) const
+{
+    // Correction
+    for(int idx=0; idx<input.size(); ++idx)
+    {
+        switch(input.at(idx).unicode())
+        {
+        case 'l':
+        case 'I':
+            input[idx] = QChar('1');
+            break;
+        case '0':
+        case 'O':
+            input[idx] = QChar('o');
+            break;
+        default:
+            break;
+        }
+    }
+
+    // Validation
+    QValidator::State state = QValidator::Acceptable;
+    for(int idx=0; idx<input.size(); ++idx)
+    {
+        int ch = input.at(idx).unicode();
+
+        if(((ch >= '0' && ch<='9') ||
+           (ch >= 'a' && ch<='z') ||
+           (ch >= 'A' && ch<='Z')) &&
+           ch != 'l' && ch != 'I' && ch != '0' && ch != 'O')
+        {
+            // Alphanumeric and not a 'forbidden' character
+        }
+        else
+        {
+            state = QValidator::Invalid;
+        }
+    }
+
+    // Empty address is "intermediate" input
+    if(input.isEmpty())
+    {
+        state = QValidator::Intermediate;
+    }
+
+    return state;
+}