Add host address to offers

contracts/Marketplace.sol

@@ -37,6 +37,7 @@ contract Marketplace is Collateral {
     Request storage request = requests[offer.requestId];
     require(balanceOf(msg.sender) >= collateral, "Insufficient collateral");
     require(request.size != 0, "Unknown request");
+    require(offer.host == msg.sender, "Invalid host address");
     require(offers[id].expiry == 0, "Offer already exists");
     // solhint-disable-next-line not-rely-on-time
     require(offer.expiry > block.timestamp, "Offer expired");
@@ -57,6 +58,7 @@ contract Marketplace is Collateral {
   }
 
   struct Offer {
+    address host;
     bytes32 requestId;
     uint256 price;
     uint256 expiry;

test/Marketplace.test.js

@@ -97,6 +97,13 @@ describe("Marketplace", function () {
         .withArgs(offerId(offer), offerToArray(offer))
     })
 
+    it("rejects offer with invalid host address", async function () {
+      let invalid = { ...offer, host: client.address }
+      await expect(marketplace.offerStorage(invalid)).to.be.revertedWith(
+        "Invalid host address"
+      )
+    })
+
     it("rejects offer for unknown request", async function () {
       let unknown = exampleRequest()
       let invalid = { ...offer, requestId: requestId(unknown) }
@@ -159,7 +166,7 @@ function requestId(request) {
 function offerId(offer) {
   return keccak256(
     defaultAbiCoder.encode(
-      ["bytes32", "uint256", "uint256"],
+      ["address", "bytes32", "uint256", "uint256"],
       offerToArray(offer)
     )
   )
@@ -179,5 +186,5 @@ function requestToArray(request) {
 }
 
 function offerToArray(offer) {
-  return [offer.requestId, offer.price, offer.expiry]
+  return [offer.host, offer.requestId, offer.price, offer.expiry]
 }

test/examples.js

@@ -19,6 +19,7 @@ const exampleBid = () => ({
 })
 
 const exampleOffer = () => ({
+  host: hexlify(randomBytes(20)),
   price: 42,
   expiry: now() + hours(1),
 })