URIToken hook

uri_token_hook.c

#include "hookapi.h"

#define MIN_XRP_AMOUNT 100000000 // 100 XRP in drops
#define ISSUER_ACCOUNT "rL4usRexjgCPTG8RoZvVHXmUjuYdWbRx2T"
#define MY_ACCOUNT "rL4usRexjgCPTG8RoZvVHXmUjuYdWbRx2T"

int64_t hook(uint32_t reserved) {

    TRACESTR("HookOnURITokenCreateSellOffer: Start.");

    // Filter on outgoing transactions
    unsigned char account_buffer[20];
    int64_t account_len = otxn_field(SBUF(account_buffer), sfAccount);
    if (account_len != 20) {
        rollback(SBUF("HookOnURITokenCreateSellOffer: Could not get account."), 1);
    }

    if (!BUFFER_EQUAL_20(account_buffer, MY_ACCOUNT)) {
        DONE("HookOnURITokenCreateSellOffer: Ignoring non-outgoing transaction.");
    }

    // Filter on sfAmount
    unsigned char amount_buffer[SFS_AMOUNT_IOU];
    int64_t amount_len = otxn_field(SBUF(amount_buffer), sfAmount);
    if (amount_len != 8) {
        DONE("HookOnURITokenCreateSellOffer: Ignoring non-XRP transaction.");
    }

    int64_t amount_drops = AMOUNT_TO_DROPS(amount_buffer);
    if (amount_drops < MIN_XRP_AMOUNT) {
        // Check if the NFT was issued from the specified wallet
        unsigned char issuer_buffer[20];
        int64_t issuer_len = otxn_field(SBUF(issuer_buffer), sfIssuer);
        if (issuer_len != 20) {
            rollback(SBUF("HookOnURITokenCreateSellOffer: Could not get issuer."), 1);
        }

        if (!BUFFER_EQUAL_20(issuer_buffer, ISSUER_ACCOUNT)) {
            rollback(SBUF("HookOnURITokenCreateSellOffer: sfAmount of Sell tx is less than 100 XRP and NFT was not issued from the specified wallet."), 1);
        }
    }

    TRACESTR("HookOnURITokenCreateSellOffer: End.");

    accept(SBUF("HookOnURITokenCreateSellOffer: Finished."), __LINE__);

    _g(1,1);

    // unreachable
    return 0;
}