New Adapter: GoAdserver

[goadserver]

🔧 Type of changes

• new bid adapter

✨ What's the context?

GoAdserver is a self-hosted, multi-tenant ad server. The Prebid.js adapter (goadserver) is already in Prebid.js, with docs at https://docs.prebid.org/dev-docs/bidders/goadserver.html. This adds the Prebid Server Java adapter. The Go counterpart is prebid/prebid-server#5023.

🧠 Rationale behind the change

• All requests go to one fixed endpoint, https://pbs.goadserver.com/openrtb2/auction. GoAdserver's gateway routes each request to the publisher's deployment by the publisher token, so the adapter never builds a hostname from request data.
• Params: token (required), plus optional floor (USD CPM, applied when the imp has no bidfloor) and subid (string or integer, sent as imp.ext.goadserver.subid).
• Requests: impressions are grouped by token, one request per token, with the token in site.publisher.id. Other publisher fields are kept.
• Bid type: taken from bid.mtype, falling back to bid.ext.prebid.type, which the endpoint sets on every bid. The endpoint's Prebid.js targeting ext is dropped and bid.ext.dsa is kept for DsaEnforcer.
• Supported traffic: site only (banner, video, native), because the endpoint needs site.page.
• No user sync, default OpenRTB 2.5: the sync cookie belongs to each deployment's domain, so there is no single sync URL. The 2.5 downgrade matches what the endpoint reads.

🔎 New Bid Adapter Checklist

• verify email contact works (support@goadserver.com)
• NO fully dynamic hostnames: a single fixed endpoint, with routing done server-side by token
• geographic host parameters are NOT required
• direct use of HTTP is prohibited: implements Bidder<BidRequest> and uses BidderUtil.defaultRequest
• if the ORTB is just forwarded to the endpoint, use the generic adapter: not applicable. The adapter groups imps by token, rewrites site.publisher.id and imp.ext, applies the floor param, and filters the response ext.
• cover an adapter configuration with an integration test (GoadserverTest)

🧪 Test plan

• GoadserverBidderTest: 18 unit tests covering site-only, grouping by token, publisher override and creation, floor precedence, subid (string and number), missing token, invalid ext, the OpenRTB version header, mtype and ext-type resolution, DSA kept and targeting stripped, unsupported types, and the default currency.
• GoadserverTest integration test against WireMock.
• BidderParamValidatorTest and BidderCatalogTest pass, and checkstyle reports 0 violations.
• The gateway endpoint is live and answers with a valid certificate.

🏎 Quality check

• Are your changes following our code style guidelines?
• Are there any breaking changes in your code? (none)
• Does your test coverage exceed 90%?
• Are there any erroneous console logs, debuggers or leftover code in your changes? (none)

🤖 Generated with Claude Code

https://claude.ai/code/session_01Logb1f3FNVSzPCTMtqNc8A