src/qt/bitcoinaddressvalidator.cpp

   1 // Copyright (c) 2011-2014 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "bitcoinaddressvalidator.h"
   6
   7 #include "base58.h"
   8
   9 /* Base58 characters are:
  10      "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
  11
  12   This is:
  13   - All numbers except for '0'
  14   - All upper-case letters except for 'I' and 'O'
  15   - All lower-case letters except for 'l'
  16 */
  17
  18 BitcoinAddressEntryValidator::BitcoinAddressEntryValidator(QObject *parent) :
  19     QValidator(parent)
  20 {
  21 }
  22
  23 QValidator::State BitcoinAddressEntryValidator::validate(QString &input, int &pos) const
  24 {
  25     Q_UNUSED(pos);
  26
  27     // Empty address is "intermediate" input
  28     if (input.isEmpty())
  29         return QValidator::Intermediate;
  30
  31     // Correction
  32     for (int idx = 0; idx < input.size();)
  33     {
  34         bool removeChar = false;
  35         QChar ch = input.at(idx);
  36         // Corrections made are very conservative on purpose, to avoid
  37         // users unexpectedly getting away with typos that would normally
  38         // be detected, and thus sending to the wrong address.
  39         switch(ch.unicode())
  40         {
  41         // Qt categorizes these as "Other_Format" not "Separator_Space"
  42         case 0x200B: // ZERO WIDTH SPACE
  43         case 0xFEFF: // ZERO WIDTH NO-BREAK SPACE
  44             removeChar = true;
  45             break;
  46         default:
  47             break;
  48         }
  49
  50         // Remove whitespace
  51         if (ch.isSpace())
  52             removeChar = true;
  53
  54         // To next character
  55         if (removeChar)
  56             input.remove(idx, 1);
  57         else
  58             ++idx;
  59     }
  60
  61     // Validation
  62     QValidator::State state = QValidator::Acceptable;
  63     for (int idx = 0; idx < input.size(); ++idx)
  64     {
  65         int ch = input.at(idx).unicode();
  66
  67         if (((ch >= '0' && ch<='9') ||
  68             (ch >= 'a' && ch<='z') ||
  69             (ch >= 'A' && ch<='Z')) &&
  70             ch != 'l' && ch != 'I' && ch != '0' && ch != 'O')
  71         {
  72             // Alphanumeric and not a 'forbidden' character
  73         }
  74         else
  75         {
  76             state = QValidator::Invalid;
  77         }
  78     }
  79
  80     return state;
  81 }
  82
  83 BitcoinAddressCheckValidator::BitcoinAddressCheckValidator(QObject *parent) :
  84     QValidator(parent)
  85 {
  86 }
  87
  88 QValidator::State BitcoinAddressCheckValidator::validate(QString &input, int &pos) const
  89 {
  90     Q_UNUSED(pos);
  91     // Validate the passed Bitcoin address
  92     CBitcoinAddress addr(input.toStdString());
  93     if (addr.IsValid())
  94         return QValidator::Acceptable;
  95
  96     return QValidator::Invalid;
  97 }