VerifiedTrading.ride

# Set Smart asset to trade only with BetterTokens verified assets and Waves.

{-# STDLIB_VERSION 2 #-}
{-# CONTENT_TYPE EXPRESSION #-}
{-# SCRIPT_TYPE ASSET #-}

# BetterTokens Oracle address.
let addr = Address(base58'3P6t5mKGwVDkyjFhtUqw4NnecyC3DRpLfkw')

match (tx) {
    case e:ExchangeTransaction => 
        # Determine if Smart asset is paired with Waves.
        let withWaves = (!isDefined(e.sellOrder.assetPair.priceAsset) || !isDefined(e.sellOrder.assetPair.amountAsset))

        if(withWaves == false) then {
            # If paired with another token, check BetterToken status.
            #
            # We cannot determine if Smart asset is amount or price asset in the pair
            # that is why we check in both places.
            let priceAssetKey = "status_<" + toBase58String(extract(e.sellOrder.assetPair.priceAsset)) + ">"
            let priceAssetInOracle = (getInteger(addr, priceAssetKey) == 2)

            let amountAssetKey = "status_<" + toBase58String(extract(e.sellOrder.assetPair.amountAsset)) + ">"
            let amountAssetInOracle = (getInteger(addr, priceAssetKey) == 2)
            
            priceAssetInOracle || amountAssetInOracle
        } else {
            true
        }
    case _ => true
}