Kobler: New adapter ported from Go

src/main/java/org/prebid/server/bidder/kobler/KoblerBidder.java

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+package org.prebid.server.bidder.kobler;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+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;
+import com.iab.openrtb.response.BidResponse;
+import com.iab.openrtb.response.SeatBid;
+import org.apache.commons.collections4.CollectionUtils;
+import org.prebid.server.bidder.Bidder;
+import org.prebid.server.bidder.model.BidderBid;
+import org.prebid.server.bidder.model.BidderCall;
+import org.prebid.server.bidder.model.BidderError;
+import org.prebid.server.bidder.model.HttpRequest;
+import org.prebid.server.bidder.model.Price;
+import org.prebid.server.bidder.model.Result;
+import org.prebid.server.currency.CurrencyConversionService;
+import org.prebid.server.exception.PreBidException;
+import org.prebid.server.json.DecodeException;
+import org.prebid.server.json.JacksonMapper;
+import org.prebid.server.proto.openrtb.ext.ExtPrebid;
+import org.prebid.server.proto.openrtb.ext.request.kobler.ExtImpKobler;
+import org.prebid.server.proto.openrtb.ext.response.BidType;
+import org.prebid.server.proto.openrtb.ext.response.ExtBidPrebid;
+import org.prebid.server.util.BidderUtil;
+import org.prebid.server.util.HttpUtil;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+public class KoblerBidder implements Bidder<BidRequest> {
+
+    private static final TypeReference<ExtPrebid<?, ExtImpKobler>> KOBLER_EXT_TYPE_REFERENCE =
+            new TypeReference<>() {
+            };
+    private static final String EXT_PREBID = "prebid";
+    private static final String DEFAULT_BID_CURRENCY = "USD";
+    private static final String DEV_ENDPOINT = "https://bid-service.dev.essrtb.com/bid/prebid_server_rtb_call";
+
+    private final String endpointUrl;
+    private final CurrencyConversionService currencyConversionService;
+    private final JacksonMapper mapper;
+
+    public KoblerBidder(String endpointUrl,
+                        CurrencyConversionService currencyConversionService,
+                        JacksonMapper mapper) {
+
+        this.endpointUrl = HttpUtil.validateUrl(endpointUrl);
+        this.currencyConversionService = Objects.requireNonNull(currencyConversionService);
+        this.mapper = Objects.requireNonNull(mapper);
+    }
+
+    @Override
+    public Result<List<HttpRequest<BidRequest>>> makeHttpRequests(BidRequest bidRequest) {
+        final List<BidderError> errors = new ArrayList<>();
+        boolean testMode = false;
+        final List<Imp> modifiedImps = new ArrayList<>();
+
+        final List<String> currencies = new ArrayList<>(bidRequest.getCur());
+        if (!currencies.contains(DEFAULT_BID_CURRENCY)) {
+            currencies.add(DEFAULT_BID_CURRENCY);
+        }
+
+        final List<Imp> imps = bidRequest.getImp();
+        if (!imps.isEmpty()) {
+            try {
+                testMode = parseImpExt(imps.getFirst()).getTest();
+            } catch (PreBidException e) {
+                errors.add(BidderError.badInput(e.getMessage()));
+                return Result.withErrors(errors);
+            }
+        }
+
+        for (Imp imp : imps) {
+            try {
+                modifiedImps.add(modifyImp(bidRequest, imp));
+            } catch (PreBidException e) {
+                errors.add(BidderError.badInput(e.getMessage()));
+                return Result.withErrors(errors);
+            }
+        }
+
+        final BidRequest modifiedRequest = bidRequest.toBuilder()
+                .cur(currencies)
+                .imp(modifiedImps)
+                .build();
+
+        final String endpoint = testMode ? DEV_ENDPOINT : endpointUrl;
+
+        final HttpRequest<BidRequest> httpRequest = BidderUtil.defaultRequest(modifiedRequest, endpoint, mapper);
+        return Result.of(Collections.singletonList(httpRequest), errors);
+    }
+
+    private Imp modifyImp(BidRequest bidRequest, Imp imp) {
+        final Price resolvedBidFloor = resolveBidFloor(imp, bidRequest);
+
+        return imp.toBuilder()
+                .bidfloor(resolvedBidFloor.getValue())
+                .bidfloorcur(resolvedBidFloor.getCurrency())
+                .build();
+    }
+
+    private Price resolveBidFloor(Imp imp, BidRequest bidRequest) {
+        final Price initialBidFloorPrice = Price.of(imp.getBidfloorcur(), imp.getBidfloor());
+        return BidderUtil.shouldConvertBidFloor(initialBidFloorPrice, DEFAULT_BID_CURRENCY)
+                ? convertBidFloor(initialBidFloorPrice, bidRequest)
+                : initialBidFloorPrice;
+    }
+
+    private Price convertBidFloor(Price bidFloorPrice, BidRequest bidRequest) {
+        final BigDecimal convertedPrice = currencyConversionService.convertCurrency(
+                bidFloorPrice.getValue(),
+                bidRequest,
+                bidFloorPrice.getCurrency(),
+                DEFAULT_BID_CURRENCY);
+
+        return Price.of(DEFAULT_BID_CURRENCY, convertedPrice);
+    }
+
+    private ExtImpKobler parseImpExt(Imp imp) {
+        try {
+            return mapper.mapper().convertValue(imp.getExt(), KOBLER_EXT_TYPE_REFERENCE).getBidder();
+        } catch (IllegalArgumentException e) {
+            throw new PreBidException(e.getMessage());
+        }
+    }
+
+    @Override
+    public Result<List<BidderBid>> makeBids(BidderCall<BidRequest> httpCall, BidRequest bidRequest) {
+        try {
+            final BidResponse bidResponse = mapper.decodeValue(httpCall.getResponse().getBody(), BidResponse.class);
+            return Result.withValues(extractBids(bidResponse));
+        } catch (DecodeException e) {
+            return Result.withError(BidderError.badServerResponse(e.getMessage()));
+        }
+    }
+
+    private List<BidderBid> extractBids(BidResponse bidResponse) {
+        if (bidResponse == null || CollectionUtils.isEmpty(bidResponse.getSeatbid())) {
+            return Collections.emptyList();
+        }
+        return bidsFromResponse(bidResponse);
+    }
+
+    private List<BidderBid> bidsFromResponse(BidResponse bidResponse) {
+        return bidResponse.getSeatbid().stream()
+                .filter(Objects::nonNull)
+                .map(SeatBid::getBid)
+                .filter(Objects::nonNull)
+                .flatMap(Collection::stream)
+                .map(bid -> BidderBid.of(bid, getBidType(bid), bidResponse.getCur()))
+                .toList();
+    }
+
+    private BidType getBidType(Bid bid) {
+        return Optional.ofNullable(bid.getExt())
+                .map(ext -> ext.get(EXT_PREBID))
+                .map(ObjectNode.class::cast)
+                .map(this::parseExtBidPrebid)
+                .map(ExtBidPrebid::getType)
+                .orElse(BidType.banner);
+    }
+
+    private ExtBidPrebid parseExtBidPrebid(ObjectNode prebid) {
+        try {
+            return mapper.mapper().treeToValue(prebid, ExtBidPrebid.class);
+        } catch (JsonProcessingException e) {
+            return null;
+        }
+    }
+}

src/main/java/org/prebid/server/proto/openrtb/ext/request/kobler/ExtImpKobler.java

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+package org.prebid.server.proto.openrtb.ext.request.kobler;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Value;
+
+@Value(staticConstructor = "of")
+public class ExtImpKobler {
+
+    @JsonProperty("test")
+    Boolean test;
+}

src/main/java/org/prebid/server/spring/config/bidder/KoblerConfiguration.java

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+package org.prebid.server.spring.config.bidder;
+
+import org.prebid.server.bidder.BidderDeps;
+import org.prebid.server.bidder.kobler.KoblerBidder;
+import org.prebid.server.currency.CurrencyConversionService;
+import org.prebid.server.json.JacksonMapper;
+import org.prebid.server.spring.config.bidder.model.BidderConfigurationProperties;
+import org.prebid.server.spring.config.bidder.util.BidderDepsAssembler;
+import org.prebid.server.spring.config.bidder.util.UsersyncerCreator;
+import org.prebid.server.spring.env.YamlPropertySourceFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+import jakarta.validation.constraints.NotBlank;
+
+@Configuration
+@PropertySource(value = "classpath:/bidder-config/kobler.yaml", factory = YamlPropertySourceFactory.class)
+public class KoblerConfiguration {
+
+    private static final String BIDDER_NAME = "kobler";
+
+    @Bean("koblerConfigurationProperties")
+    @ConfigurationProperties("adapters.kobler")
+    BidderConfigurationProperties configurationProperties() {
+        return new BidderConfigurationProperties();
+    }
+
+    @Bean
+    BidderDeps koblerBidderDeps(BidderConfigurationProperties koblerConfigurationProperties,
+                                CurrencyConversionService currencyConversionService,
+                                @NotBlank @Value("${external-url}") String externalUrl,
+                                JacksonMapper mapper) {
+
+        return BidderDepsAssembler.forBidder(BIDDER_NAME)
+                .withConfig(koblerConfigurationProperties)
+                .usersyncerCreator(UsersyncerCreator.create(externalUrl))
+                .bidderCreator(config -> new KoblerBidder(config.getEndpoint(), currencyConversionService, mapper))
+                .assemble();
+    }
+}

src/main/resources/bidder-config/kobler.yaml

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+adapters:
+  kobler:
+    endpoint: "https://bid.essrtb.com/bid/prebid_server_rtb_call"
+    endpoint-compression: gzip
+    geoscope:
+      - NOR
+      - SWE
+      - DNK
+    meta-info:
+      maintainer-email: [email protected]
+      site-media-types:
+      - banner
+      vendor-id: 0

src/main/resources/static/bidder-params/kobler.json

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+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "title": "Kobler Adapter Params",
+  "description": "A schema which validates params accepted by the Kobler adapter",
+  "type": "object",
+
+  "properties": {
+    "test": {
+      "type": "boolean",
+      "description": "Whether the request is for testing only. When multiple ad units are submitted together, it is enough to set this parameter on the first one."
+    }
+  }
+}