Inside Bitcoin

1// Copyright (c) 2011-present 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 <qt/bitcoinaddressvalidator.h>
6
7#include <key_io.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
18BitcoinAddressEntryValidator::BitcoinAddressEntryValidator(QObject *parent) :
19    QValidator(parent)
20{
21}
22
23QValidator::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 != 'I' && ch != 'O') // Characters invalid in both Base58 and Bech32
71        {
72            // Alphanumeric and not a 'forbidden' character
73        }
74        else
75        {
76            state = QValidator::Invalid;
77        }
78    }
79
80    return state;
81}
82
83BitcoinAddressCheckValidator::BitcoinAddressCheckValidator(QObject *parent) :
84    QValidator(parent)
85{
86}
87
88QValidator::State BitcoinAddressCheckValidator::validate(QString &input, int &pos) const
89{
90    Q_UNUSED(pos);
91    // Validate the passed Bitcoin address
92    if (IsValidDestinationString(input.toStdString())) {
93        return QValidator::Acceptable;
94    }
95
96    return QValidator::Invalid;
97}
98