The tool generates bidder-specific files required for PreBid Server(PBS). A user should provide all necessary information via user interface(web page).

The tool doesn't support type casting, therefore fields should be modified with an appropriate type value whether it's a literal or value taken from another field. Also, tool doesn't support conditional changes, like the ones that could modify a certain field depending on some condition.

OpenRTB fields that cannot be modified(i.e. have a value assigned to them):

1. request.site.content, request.app.content;
2. Any exchange-specific extensions to OpenRTB (.ext fields);
3. A specific element of list, array or sequence.

Currently supported transformations:

1. Static transformations, e.g. setting a constant value(or null) to a field: request.imp.id = "id", request.at = 1, request.imp[i].banner.format = null;
2. Dynamic transformations, e.g. value taken from another field:
   • On impression level - values can be taken from request.imp[i] and request.imp[i].ext.bidder., where imp[i] is a current impression and .ext.bidder - bidder-specific impression extension. For example: request.imp[i].tagid <- request.imp[i].ext.bidder.bidderField request.imp[i].banner.id <- request.imp[i].id
   • On request level - values can be taken from any request field, except selecting a specific value from list, array or sequence fields, e.g. an array can be assigned from another array field, but array[i] cannot be assigned to specific field. For example: request.site.publisher.id <- request.id request.app.id <- request.app.content.producer.id request.test <- request.site.privacypolicy

Finally, if an OpenRTB Object's field needs to be modified, tool either modifies an existing object, or creates a new one and sets target field(other fields would be empty).

All above-mentioned transformations can be manually customized in case something cannot be done via code generation by modifying {BidderName}Bidder.java file.

The tool presumes that local PBS directory is in the same parent directory as Bidder Generation Tool and it is named according to PBS github repository - prebid-server-java. Otherwise, it would create prebid-server-java folder in Bidder Generation Tool parent directory and generate folders and files there. In such case, you would have to manually move files to where the PBS is to submit a Pull Request.

Following files(and folders, if they don't exist) are being generated in local PBS directory:

1. src/main/java/org/prebid/server/bidder/{biddername}/{BidderName}Bidder.java - java class that handles bidder request transformations;
2. src/main/java/org/prebid/server/spring/config/bidder/{BidderName}Configuration.java - bidder java configuration class;
3. src/main/java/org/prebid/server/proto/openrtb/ext/request/{biddername}/ExtImp{BidderName}.java - java class that is a model for bidder-specific extension, passed in request.imp.ext.bidder;
4. src/main/resources/bidder-config/{biddername}.yaml - bidder configuration properties, user sync and meta info file;
5. src/main/resources/static/bidder-params/{bidderName}.json - bidder json schema that describes bidder-specific parameters;
6. src/test/java/org/prebid/server/bidder/{biddername}/{BidderName}BidderTest.java - java test class for Bidder class.

In case the any file at the targeted path already exists - it would be overridden.

Prerequisites:

• Java 8+
• Maven 3.3+

Steps:

1. OPTIONAL. Clone prebid-server-java repository with [email protected]:rubicon-project/prebid-server-java.git command. If you have it already, proceed to step 2. If you want to just generate files and move them at will - skip this step.

2. Clone the bidder-generation-tool repository with [email protected]:rubicon-project/pbs-java-bidder-generation.git command to the same parent directory where you have prebid-server-java. In case PBS directory name is different or it is absent - the tool will create prebid-server-java folder in it's parent directory and write files there so you can move them where you need.

3. Run Bidder Generation Tool from its directory with command mvn spring-boot:run. After application loads it should open its homepage at your default browser or if it did not - got to localhost:8080

4. Fill up the form providing all necessary information and bidder implementation details and click Generate Bidder Files. In case the files already exist (e.g. you need to change something) - make necessary changes in the form and click Generate Bidder Files again - all necessary files will be overridden.

Fields:

• Bidder Name - e.g. "myBidder". No spaces or special characters, we recommend that this should be the same as your Prebid.js bidder code.
• Maintainer Email - we want to be able to get in touch with you should something go wrong
• IAB Vendor ID - Prebid.org supports the IAB method of complying with GDPR. https://advertisingconsent.eu/vendor-list/
• Auction endpoint URL - the POST destination where the final generated OpenRTB will be sent to your bidder.
• User syncer url - this is where /cookie_sync should send the user to get an ID cookie for your domain. e.g. //id.mybidder.com/getuid?
• User sync UID placeholder - this is the argument that represents bidder's UID placeholder wich should be sent to the user sync URL. The placeholder that should be provided can vary on your bidder specifics: it could be $UID, ${UID}, blank, or any other placeholder. By default, leaves the uid= which is blank/absent UID. In case any extra changes should be made, you can manually modify the generated {biddername}.yaml config file. Example of generated usersync params: /setuid?bidder=biddername&gdpr={{gdpr}}&gdpr_consent={{gdpr_consent}}&uid=$UID
• Endpoint accepts multiple imps - if your bidder accepts multiple imps in the OpenRTB, use this value. Otherwise, if you need to have the imps split out into separate requests, switch to 'Endpoint accepts one imp at a time'.
• Accepts web traffic - define which types of media your bidder accepts
• Accepts app traffic - define which types of media your bidder accepts
• Bidder params - Add the parameters allowed by your bidder. e.g. 'placementId'.
• Transformations - Add customizations to the OpenRTB JSON needed by your bidder. Basically, if there's a static value your bidder needs to have, or a simple field copy, the transformations listed above will do the job.

5. Check out the generated files in prebid-server-java directory. e.g. cd ~/git/prebid-server-java/src/main/java/org/prebid/server/bidder/myBidder

6. Create a branch and submit a PR to the open source repo

   • cd ~/git/prebid-server-java
   • git checkout -b myBidder-adapter
   • git status # eyeball to make sure no unexpected changes are going to be submitted
   • git add
   • git commit -m "myBidder adapter generated through the UI"
   • git push --set-upstream origin myBidder-adapter
   • In the browser go to https://github.com/rubicon-project/prebid-server-java
   • Create a PR from the new branch