CpmStar: Adapter Update bidder implementation to allow imp.ext passthrough with the correct custom parameters.

Author: przemkaczmarek

src/main/java/org/prebid/server/bidder/cpmstar/CpmStarBidder.java

@@ -1,6 +1,7 @@
 package org.prebid.server.bidder.cpmstar;
 
 import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.iab.openrtb.request.BidRequest;
 import com.iab.openrtb.request.Imp;
 import com.iab.openrtb.response.Bid;
@@ -26,6 +27,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.Map;
 import java.util.Objects;
 
 public class CpmStarBidder implements Bidder<BidRequest> {
@@ -79,7 +81,14 @@ private Imp createImp(ExtImpCpmStar extImpCpmStar, Imp imp) {
         if (extImpCpmStar == null) {
             throw new PreBidException("imp id=%s: bidder.ext is null".formatted(imp.getId()));
         }
-        return imp.toBuilder().ext(mapper.mapper().valueToTree(extImpCpmStar)).build();
+        final Map<String, Object> extMap = mapper.mapper().convertValue(imp.getExt(), new TypeReference<>() {
+        });
+        final Map<String, Object> bidderMap = (Map<String, Object>) extMap.remove("bidder");
+        if (bidderMap != null) {
+            extMap.putAll(bidderMap);
+        }
+        final ObjectNode newExt = mapper.mapper().valueToTree(extMap);
+        return imp.toBuilder().ext(newExt).build();
     }
 
     @Override

src/test/resources/org/prebid/server/it/openrtb2/cpmstar/test-auction-cpmstar-request.json

@@ -21,4 +21,4 @@
       "gdpr": 0
     }
   }
-}
+}

src/test/resources/org/prebid/server/it/openrtb2/cpmstar/test-cpmstar-bid-request.json

@@ -9,14 +9,12 @@
         "h": 250
       },
       "ext": {
+        "tid" : "${json-unit.any-string}",
         "placementId": 1234,
         "subpoolId": 1234
       }
     }
   ],
-  "source": {
-    "tid": "${json-unit.any-string}"
-  },
   "site": {
     "domain": "www.example.com",
     "page": "http://www.example.com",
@@ -36,6 +34,8 @@
   "cur": [
     "USD"
   ],
+  "source" :
+  {"tid" : "${json-unit.any-string}"},
   "regs": {
     "ext": {
       "gdpr": 0
@@ -52,3 +52,4 @@
     }
   }
 }
+