add UNICORN bid adapter (prebid#4917)

* add UNICORN bid adapter

* fix not using flatMap

* fix symbol error

* care lint & empty response

* care lint & add tests

modules/unicornBidAdapter.js

@@ -0,0 +1,144 @@
+import * as utils from '../src/utils.js';
+import { BANNER } from '../src/mediaTypes.js';
+import { registerBidder } from '../src/adapters/bidderFactory.js';
+const BIDDER_CODE = 'unicorn';
+const UNICORN_ENDPOINT = 'https://ds.uncn.jp/pb/0/bid.json';
+const UNICORN_DEFAULT_CURRENCY = 'JPY';
+const UNICORN_PB_COOKIE_KEY = '__pb_unicorn_aud';
+
+/**
+ * Placement ID and Account ID are required.
+ * @param {BidRequest} bidRequest
+ * @returns {boolean}
+ */
+const isBidRequestValid = bidRequest => {
+  return !!bidRequest.adUnitCode && !!bidRequest.params.accountId;
+};
+
+/**
+ * @param {Array<BidRequest>} validBidRequests
+ * @param {any} bidderRequest
+ * @returns {ServerRequest}
+ */
+export const buildRequests = (validBidRequests, bidderRequest) => {
+  return {
+    method: 'POST',
+    url: UNICORN_ENDPOINT,
+    data: buildOpenRtbBidRequestPayload(validBidRequests, bidderRequest)
+  };
+};
+
+/**
+ * Transform BidRequest to OpenRTB-formatted BidRequest Object
+ * @param {Array<BidRequest>} validBidRequests
+ * @param {any} bidderRequest
+ * @returns {string}
+ */
+function buildOpenRtbBidRequestPayload(validBidRequests, bidderRequest) {
+  utils.logInfo(
+    '[UNICORN] buildOpenRtbBidRequestPayload.validBidRequests:',
+    validBidRequests
+  );
+  utils.logInfo(
+    '[UNICORN] buildOpenRtbBidRequestPayload.bidderRequest:',
+    bidderRequest
+  );
+  const imp = validBidRequests.map(br => {
+    const sizes = utils.parseSizesInput(br.sizes)[0];
+    return {
+      id: br.bidId,
+      banner: {
+        w: sizes.split('x')[0],
+        h: sizes.split('x')[1]
+      },
+      tagid: utils.deepAccess(br, 'params.placementId') || br.adUnitCode,
+      secure: 1,
+      bidfloor: parseFloat(utils.deepAccess(br, 'params.bidfloorCpm') || 0)
+    };
+  });
+  const request = {
+    id: bidderRequest.auctionId,
+    at: 1,
+    imp,
+    cur: UNICORN_DEFAULT_CURRENCY,
+    site: {
+      id: window.location.hostname,
+      publisher: {
+        id: utils.deepAccess(validBidRequests[0], 'params.accountId')
+      },
+      domain: window.location.hostname,
+      page: window.location.href,
+      ref: bidderRequest.refererInfo.referer
+    },
+    device: {
+      language: navigator.language,
+      ua: navigator.userAgent
+    },
+    user: {
+      id: getUid()
+    },
+    bcat: utils.deepAccess(validBidRequests[0], 'params.bcat') || [],
+    source: {
+      ext: {
+        stype: 'prebid_uncn',
+        bidder: BIDDER_CODE
+      }
+    }
+  };
+  utils.logInfo('[UNICORN] OpenRTB Formatted Request:', request);
+  return JSON.stringify(request);
+}
+
+const interpretResponse = (serverResponse, request) => {
+  utils.logInfo('[UNICORN] interpretResponse.serverResponse:', serverResponse);
+  utils.logInfo('[UNICORN] interpretResponse.request:', request);
+  const res = serverResponse.body;
+  var bids = []
+  if (res) {
+    res.seatbid.forEach(sb => {
+      sb.bid.forEach(b => {
+        bids.push({
+          requestId: b.impid,
+          cpm: b.price || 0,
+          width: b.w,
+          height: b.h,
+          ad: b.adm,
+          ttl: 1000,
+          creativeId: b.crid,
+          netRevenue: false,
+          currency: res.cur
+        })
+      })
+    });
+  }
+  utils.logInfo('[UNICORN] interpretResponse bids:', bids);
+  return bids;
+};
+
+/**
+ * Get or Create Uid for First Party Cookie
+ */
+const getUid = () => {
+  const ck = utils.getCookie(UNICORN_PB_COOKIE_KEY);
+  if (ck) {
+    return JSON.parse(ck)['uid'];
+  } else {
+    const newCk = {
+      uid: utils.generateUUID()
+    };
+    const expireIn = new Date(Date.now() + 24 * 60 * 60 * 10000).toUTCString();
+    utils.setCookie(UNICORN_PB_COOKIE_KEY, JSON.stringify(newCk), expireIn);
+    return newCk.uid;
+  }
+};
+
+export const spec = {
+  code: BIDDER_CODE,
+  aliases: ['uncn'],
+  supportedMediaTypes: [BANNER],
+  isBidRequestValid,
+  buildRequests,
+  interpretResponse,
+};
+
+registerBidder(spec);

modules/unicornBidAdapter.md

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+# Overview
+
+**Module Name**: UNICORN Bid Adapter
+**Module Type**: Bidder Adapter
+**Maintainer**: service+prebid.js@bulbit.jp
+
+# Description
+
+Module that connects to UNICORN.
+
+# Test Parameters
+
+```js
+    const adUnits = [{
+        code: 'test-adunit1', // REQUIRED: adunit code
+        mediaTypes: {
+            banner: {
+                sizes: [[300, 250]] // a banner size
+            }
+        },
+        bids: [{
+            bidder: 'unicorn',
+            params: {
+                placementId: 'rectangle-ad-1', // OPTIONAL: If placementId is empty, adunit code will be used as placementId. 
+                bidfloorCpm: 0.2, // OPTIONAL: Floor CPM (JPY) defaults to 0
+                accountId: 12345, // REQUIRED: Account ID for charge request
+                bcat: ['IAB-1', 'IAB-2'] // OPTIONAL: blocked IAB categories
+            }
+        }]
+    }];
+```