Initial commit.

src/qt/bitcoinaddressvalidator.cpp

@@ -0,0 +1,77 @@
+#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();)
+    {
+        bool removeChar = false;
+        QChar ch = input.at(idx);
+        // Corrections made are very conservative on purpose, to avoid
+        // users unexpectedly getting away with typos that would normally
+        // be detected, and thus sending to the wrong address.
+        switch(ch.unicode())
+        {
+        // Qt categorizes these as "Other_Format" not "Separator_Space"
+        case 0x200B: // ZERO WIDTH SPACE
+        case 0xFEFF: // ZERO WIDTH NO-BREAK SPACE
+            removeChar = true;
+            break;
+        default:
+            break;
+        }
+        // Remove whitespace
+        if(ch.isSpace())
+            removeChar = true;
+        // To next character
+        if(removeChar)
+            input.remove(idx, 1);
+        else
+            ++idx;
+    }
+
+    // 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;
+}