From 04a9fd399c0a7c069b909b60ae12604b44a266ed Mon Sep 17 00:00:00 2001
From: "Isaac A. Dettman" <idettman@rubiconproject.com>
Date: Thu, 25 Jul 2019 14:27:09 -0700
Subject: [PATCH] Add oRTB cur to PrebidServer Adapter (#3951)

* Add 'cur' to ORTB obj
---
 modules/prebidServerBidAdapter/index.js       | 12 +++++
 .../modules/prebidServerBidAdapter_spec.js    | 46 ++++++++++++++++++-
 2 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/modules/prebidServerBidAdapter/index.js b/modules/prebidServerBidAdapter/index.js
index e857bf1d665..582b12e59d7 100644
--- a/modules/prebidServerBidAdapter/index.js
+++ b/modules/prebidServerBidAdapter/index.js
@@ -533,6 +533,18 @@ const OPEN_RTB_PROTOCOL = {
       request.ext.prebid = Object.assign(request.ext.prebid, _s2sConfig.extPrebid);
     }
 
+    /**
+     * @type {(string[]|string|undefined)} - OpenRTB property 'cur', currencies available for bids
+     */
+    const adServerCur = config.getConfig('currency.adServerCurrency');
+    if (adServerCur && typeof adServerCur === 'string') {
+      // if the value is a string, wrap it with an array
+      request.cur = [adServerCur];
+    } else if (Array.isArray(adServerCur) && adServerCur.length) {
+      // if it's an array, get the first element
+      request.cur = [adServerCur[0]];
+    }
+
     _appendSiteAppDevice(request);
 
     const digiTrust = _getDigiTrustQueryParams(bidRequests && bidRequests[0]);
diff --git a/test/spec/modules/prebidServerBidAdapter_spec.js b/test/spec/modules/prebidServerBidAdapter_spec.js
index 9562b2f4c07..8b077ca796a 100644
--- a/test/spec/modules/prebidServerBidAdapter_spec.js
+++ b/test/spec/modules/prebidServerBidAdapter_spec.js
@@ -904,9 +904,51 @@ describe('S2S Adapter', function () {
       expect(Array.isArray(requestBid.user.ext.eids)).to.be.true;
       expect(requestBid.user.ext.eids.filter(eid => eid.source === 'adserver.org')).is.not.empty;
       expect(requestBid.user.ext.eids.filter(eid => eid.source === 'adserver.org')[0].uids[0].id).is.equal('abc123');
-      expect(requestBid.user.ext.eids.filter(eid => eid.source === 'pubcommon')).is.not.empty; ;
+      expect(requestBid.user.ext.eids.filter(eid => eid.source === 'pubcommon')).is.not.empty;
       expect(requestBid.user.ext.eids.filter(eid => eid.source === 'pubcommon')[0].uids[0].id).is.equal('1234');
-    })
+    });
+
+    it('when config \'currency.adServerCurrency\' value is an array: ORTB has property \'cur\' value set to a single item array', function () {
+      let s2sConfig = utils.deepClone(CONFIG);
+      s2sConfig.endpoint = 'https://prebid.adnxs.com/pbs/v1/openrtb2/auction';
+      config.setConfig({
+        currency: {adServerCurrency: ['USD', 'GB', 'UK', 'AU']},
+        s2sConfig: s2sConfig
+      });
+
+      const bidRequests = utils.deepClone(BID_REQUESTS);
+      adapter.callBids(REQUEST, bidRequests, addBidResponse, done, ajax);
+
+      const parsedRequestBody = JSON.parse(requests[0].requestBody);
+      expect(parsedRequestBody.cur).to.deep.equal(['USD']);
+    });
+
+    it('when config \'currency.adServerCurrency\' value is a string: ORTB has property \'cur\' value set to a single item array', function () {
+      let s2sConfig = utils.deepClone(CONFIG);
+      s2sConfig.endpoint = 'https://prebid.adnxs.com/pbs/v1/openrtb2/auction';
+      config.setConfig({
+        currency: {adServerCurrency: 'NZ'},
+        s2sConfig: s2sConfig
+      });
+
+      const bidRequests = utils.deepClone(BID_REQUESTS);
+      adapter.callBids(REQUEST, bidRequests, addBidResponse, done, ajax);
+
+      const parsedRequestBody = JSON.parse(requests[1].requestBody);
+      expect(parsedRequestBody.cur).to.deep.equal(['NZ']);
+    });
+
+    it('when config \'currency.adServerCurrency\' is unset: ORTB should not define a \'cur\' property', function () {
+      let s2sConfig = utils.deepClone(CONFIG);
+      s2sConfig.endpoint = 'https://prebid.adnxs.com/pbs/v1/openrtb2/auction';
+      config.setConfig({s2sConfig: s2sConfig});
+
+      const bidRequests = utils.deepClone(BID_REQUESTS);
+      adapter.callBids(REQUEST, bidRequests, addBidResponse, done, ajax);
+
+      const parsedRequestBody = JSON.parse(requests[0].requestBody);
+      expect(typeof parsedRequestBody.cur).to.equal('undefined');
+    });
 
     it('always add ext.prebid.targeting.includebidderkeys: false for ORTB', function () {
       const s2sConfig = Object.assign({}, CONFIG, {