call smart contracts for payout amounts (#50)

src/app/api/_utils/chain.ts

@@ -0,0 +1,6 @@
+import { ethers, JsonRpcProvider, Signer } from "ethers";
+
+export async function getBackendVoidSigner(): Promise<Signer> {
+    const provider = new JsonRpcProvider(process.env.BACKEND_CHAIN_RPC_URL);
+    return new ethers.VoidSigner("0x0000000000000000000000000000000000000000", provider);
+}

src/app/api/quote/[carrier]/[flightNumber]/route.ts

@@ -3,6 +3,8 @@ import { NextRequest } from "next/server";
 import { LOGGER } from "../../../../../utils/logger_backend";
 import { FLIGHTSTATS_BASE_URL } from "../../../_utils/config";
 import { sendRequestAndReturnResponse } from "../../../_utils/proxy";
+import { FlightLib__factory } from "../../../../../contracts/gif";
+import { getBackendVoidSigner } from "../../../_utils/chain";
 
 /**
  * get rating from flightstats and calculate quote via contract call 
@@ -26,8 +28,14 @@ export async function GET(request: NextRequest, { params } : { params: { carrier
     LOGGER.debug(`[${reqId}] Ratings:ontime ${rating.ontime}, observations: ${rating.observations}, late15 ${rating.late15}, late30 ${rating.late30}, `
         + `late45 ${rating.late45}, cancelled ${rating.cancelled}, diverted ${rating.diverted} ontimepercent ${rating.ontimepercent}`);
 
+    const signer = await getBackendVoidSigner();
+
     // TODO: calculate premium based on rating by calling onchain quote function (#45)
     // TODO: generate signature for flight rating data
+    const productAddress = process.env.NEXT_PUBLIC_PRODUCT_CONTRACT_ADDRESS!;
+    const flightLib = FlightLib__factory.connect(process.env.NEXT_PUBLIC_FLIGHT_LIB_ADDRESS!, signer);
+    const result = await flightLib.calculatePayoutAmounts(productAddress, 30 * 10 ** 6, [rating.observations, rating.late15, rating.late30, rating.late45, rating.cancelled, rating.diverted]);
+    LOGGER.info(`calculatePayoutAmounts ${result[0].toString()}, ${result[1].toString()}, ${result[2].toString()}`);
 
     return Response.json({
         premium: 30 * 10 ** 6, // FIXME: return actual premium