New Adapter: Adswag

[westerschmal]

New Adapter: Adswag

Adds the Adswag bid adapter for Adswag's directly-integrated European supply.

• Maintainer: prebid@adswag.ai (bidder-info yaml)
• GVL vendor ID: 1417
• Media types: banner, video, audio — site and app (no native, no DOOH)
• Endpoint: https://bid.adswag.ai/prebid/bid (static, EU-hosted; no dynamic hostnames, no geographic host parameters)
• OpenRTB: 2.6, GPP supported, multi-format imps supported (the adapter does not split imps)
• Usersync: consent-gated redirect syncer on ev.adswag.ai (uid macro $UID); under GDPR a uid is only issued with vendor-1417 + Purpose-1 consent, otherwise the redirect carries an empty uid
• Params: publisherId (required, string), placementId (optional, string) — schema in static/bidder-params/adswag.json
• modifyingVastXmlAllowed: false — our ad server owns VAST composition and measurement beacons

Bidder params for validating bids (live evergreen test campaign, bids €2.50 EUR; verified against production 2026-08-13):

{ "publisherId": "prebid-test", "placementId": "prebid-test-display" }

Display imps must include size 300x250; prebid-test-video / prebid-test-audio for video (mp4) and audio (mpeg/mp4) imps. placementId may be omitted (placement is discovered from gpid/adunit code). Requests with test: 1 also receive bids.

Tests: go test -race -cover ./adapters/adswag/... — 94.7% coverage; 6 exemplary + 14 supplemental JSON fixtures plus a captured-production-response test (fixture tokens are synthetic). ./validate.sh suite green.

Docs PR (bidder page with pbs metadata): prebid/prebid.github.io#6702
Prebid.js adapter PR: prebid/Prebid.js#15487

We will port this adapter to prebid-server-java ourselves (port PR opened alongside).

[westerschmal]

This PR is ready for review whenever someone has a chance. One note on the red semgrep-check: the failure is the pull_request_target workflow declining to check out fork branches — it reproduces on the pre-change commit and on other fork PRs (e.g. #4897) — so it isn't caused by anything in this change. Happy to address any feedback.

[github-actions]

Code coverage summary

Note:

• Prebid team doesn't anticipate tests covering code paths that might result in marshal and unmarshal errors
• Coverage summary encompasses all commits leading up to the latest one, 9090e28

adswag

Refer here for heat map coverage report

github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:39:	Builder		100.0%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:43:	MakeRequests	88.2%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:121:	parseImpExt	88.5%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:162:	setPublisherID	93.3%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:185:	MakeBids	100.0%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:237:	makeTypedBid	92.9%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:289:	resolveBidType	100.0%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:315:	findImp		100.0%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:324:	bannerSize	100.0%
github.com/prebid/prebid-server/v4/adapters/adswag/adswag.go:339:	iframeMarkup	100.0%
total:									(statements)	93.6%