forwarder.oscript

/*
Double forwarder:
- forward data1 to address1
- receive some coins in response (single-asset responses only)
- forward the coins, plus data2, to the final recipient address2 (which can be another AA)
*/
{
	init: `{
		$non_bytes_asset = trigger.output[[asset!=base]].asset;
		if ($non_bytes_asset == 'ambiguous')
			bounce('ambiguous asset');
		$asset = $non_bytes_asset == 'none' ? 'base' : $non_bytes_asset;

		$claim_num = trigger.data.claim_num;
		$step1 = !!$claim_num; // from the bridge
		if ($step1){
			$data = trigger.data.data;
			$address = $data.address1;
			$data_to_forward = $data.data1;
		}
		else if (var['initial_unit'] AND var['initial_unit'] == trigger.initial_unit AND var['address2']){ // response from the AA called in step 1
			$step2 = true;
			$address = var['address2'];
			$data_to_forward = var['data2'];
		}
	}`,
	messages: [
		{
			if: `{$step1 OR $step2}`,
			app: 'payment',
			payload: {
				asset: '{$asset}',
				outputs: [{address: `{$address}`, amount: `{trigger.output[[asset=$asset]]}`}]
			}
		},
		{ // send additional 1000 bytes
			if: `{($step1 OR $step2) AND $asset != 'base'}`,
			app: 'payment',
			payload: {
				asset: 'base',
				outputs: [{address: `{$address}`, amount: 1000}]
			}
		},
		{
			if: `{$data_to_forward}`,
			app: 'data',
			payload: `{
				$data_to_forward
			}`
		},
		{
			app: 'state',
			state: `{
				if ($step1 AND $data.address2){ // save step2 data for future forwarding
					var['initial_unit'] = trigger.initial_unit;
					var['address2'] = $data.address2;
					var['data2'] = $data.data2;
				}
				else if ($step2){
					var['initial_unit'] = false;
					var['address2'] = false;
					var['data2'] = false;
				}
				response['message'] = $step1 ? 'forwarded 1' : ($step2 ? 'forwarded 2' : 'deposited');
			}`
		}
	]
}