C++ STObject::getFieldArray方法代码示例

TxMeta::TxMeta (uint256 const& txid, std::uint32_t ledger, STObject const& obj,
    beast::Journal j)
    : mTransactionID (txid)
    , mLedger (ledger)
    , mNodes (obj.getFieldArray (sfAffectedNodes))
    , j_ (j)
{
    mResult = obj.getFieldU8 (sfTransactionResult);
    mIndex = obj.getFieldU32 (sfTransactionIndex);

    auto affectedNodes = dynamic_cast <STArray const*>
        (obj.peekAtPField (sfAffectedNodes));
    assert (affectedNodes);
    if (affectedNodes)
        mNodes = *affectedNodes;

    if (obj.isFieldPresent (sfDeliveredAmount))
        setDeliveredAmount (obj.getFieldAmount (sfDeliveredAmount));
}

std::pair<std::vector<SignerEntries::SignerEntry>, TER>
SignerEntries::deserialize (
    STObject const& obj, beast::Journal journal, std::string const& annotation)
{
    std::pair<std::vector<SignerEntry>, TER> s;

    if (!obj.isFieldPresent (sfSignerEntries))
    {
        if (journal.trace) journal.trace <<
            "Malformed " << annotation << ": Need signer entry array.";
        s.second = temMALFORMED;
        return s;
    }

    auto& accountVec = s.first;
    accountVec.reserve (STTx::maxMultiSigners);

    STArray const& sEntries (obj.getFieldArray (sfSignerEntries));
    for (STObject const& sEntry : sEntries)
    {
        // Validate the SignerEntry.
        if (sEntry.getFName () != sfSignerEntry)
        {
            journal.trace <<
                "Malformed " << annotation << ": Expected SignerEntry.";
            s.second = temMALFORMED;
            return s;
        }

        // Extract SignerEntry fields.
        AccountID const account = sEntry.getAccountID (sfAccount);
        std::uint16_t const weight = sEntry.getFieldU16 (sfSignerWeight);
        accountVec.emplace_back (account, weight);
    }

    s.second = tesSUCCESS;
    return s;
}

static
bool
isMemoOkay (STObject const& st, std::string& reason)
{
    if (!st.isFieldPresent (sfMemos))
        return true;

    auto const& memos = st.getFieldArray (sfMemos);

    // The number 2048 is a preallocation hint, not a hard limit
    // to avoid allocate/copy/free's
    Serializer s (2048);
    memos.add (s);

    // FIXME move the memo limit into a config tunable
    if (s.getDataLength () > 1024)
    {
        reason = "The memo exceeds the maximum allowed size.";
        return false;
    }

    for (auto const& memo : memos)
    {
        auto memoObj = dynamic_cast <STObject const*> (&memo);

        if (!memoObj || (memoObj->getFName() != sfMemo))
        {
            reason = "A memo array may contain only Memo objects.";
            return false;
        }

        for (auto const& memoElement : *memoObj)
        {
            auto const& name = memoElement.getFName();

            if (name != sfMemoType &&
                name != sfMemoData &&
                name != sfMemoFormat)
            {
                reason = "A memo may contain only MemoType, MemoData or "
                         "MemoFormat fields.";
                return false;
            }

            // The raw data is stored as hex-octets, which we want to decode.
            auto data = strUnHex (memoElement.getText ());

            if (!data.second)
            {
                reason = "The MemoType, MemoData and MemoFormat fields may "
                         "only contain hex-encoded data.";
                return false;
            }

            if (name == sfMemoData)
                continue;

            // The only allowed characters for MemoType and MemoFormat are the
            // characters allowed in URLs per RFC 3986: alphanumerics and the
            // following symbols: -._~:/?#[]@!$&'()*+,;=%
            static std::array<char, 256> const allowedSymbols = []
            {
                std::array<char, 256> a;
                a.fill(0);

                std::string symbols (
                    "0123456789"
                    "-._~:/?#[]@!$&'()*+,;=%"
                    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                    "abcdefghijklmnopqrstuvwxyz");

                for(char c : symbols)
                    a[c] = 1;
                return a;
            }();

            for (auto c : data.first)
            {
                if (!allowedSymbols[c])
                {
                    reason = "The MemoType and MemoFormat fields may only "
                             "contain characters that are allowed in URLs "
                             "under RFC 3986.";
                    return false;
                }
            }
        }
    }

    return true;
}