Add a new adapter for Appier bidder.

modules/appierBidAdapter.js

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+import { registerBidder } from 'src/adapters/bidderFactory';
+import { BANNER } from 'src/mediaTypes';
+import { config } from 'src/config';
+
+export const ADAPTER_VERSION = '1.0.0';
+const SUPPORTED_AD_TYPES = [BANNER];
+
+// we have different servers for different regions / farms
+export const API_SERVERS_MAP = {
+  'default': 'ad2.apx.appier.net',
+  'tw': 'ad2.apx.appier.net',
+  'jp': 'ad-jp.apx.appier.net'
+};
+
+const BIDDER_API_ENDPOINT = '/v1/prebid/bid';
+
+export const spec = {
+  code: 'appier',
+  supportedMediaTypes: SUPPORTED_AD_TYPES,
+
+  /**
+   * Determines whether or not the given bid request is valid.
+   *
+   * @param {BidRequest} bid The bid params to validate.
+   * @return boolean True if this is a valid bid, and false otherwise.
+   */
+  isBidRequestValid: function (bid) {
+    return typeof bid.params.hzid === 'string';
+  },
+
+  /**
+   * Make a server request from the list of BidRequests.
+   *
+   * @param {bidRequests[]} - an array of bids
+   * @return ServerRequest Info describing the request to the server.
+   */
+  buildRequests: function (bidRequests, bidderRequest) {
+    if (bidRequests.length === 0) {
+      return [];
+    }
+    const server = this.getApiServer();
+    const bidderApiUrl = `//${server}${BIDDER_API_ENDPOINT}`
+    const payload = {
+      'bids': bidRequests,
+      'refererInfo': bidderRequest.refererInfo,
+      'version': ADAPTER_VERSION
+    };
+    return [{
+      method: 'POST',
+      url: bidderApiUrl,
+      data: payload,
+      // keep the bidder request object for later use
+      bidderRequest: bidderRequest
+    }];
+  },
+
+  /**
+   * Unpack the response from the server into a list of bids.
+   *
+   * @param {serverResponse} serverResponse A successful response from the server.
+   * @return {Bid[]} An array of bids which were nested inside the server.
+   */
+  interpretResponse: function (serverResponse, serverRequest) {
+    if (!Array.isArray(serverResponse.body)) {
+      return [];
+    }
+    // server response body is an array of bid results
+    const bidResults = serverResponse.body;
+    // our server directly returns the format needed by prebid.js so no more
+    // transformation is needed here.
+    return bidResults;
+  },
+
+  /**
+   * Get the hostname of the server we want to use.
+   */
+  getApiServer() {
+    // we may use different servers for different farms (geographical regions)
+    // if a server is specified explicitly, use it. otherwise, use farm specific server.
+    let server = config.getConfig('appier.server');
+    if (!server) {
+      const farm = config.getConfig('appier.farm');
+      server = API_SERVERS_MAP[farm] || API_SERVERS_MAP['default'];
+    }
+    return server;
+  }
+};
+
+registerBidder(spec);

modules/appierBidAdapter.md

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+# Overview
+
+```
+Module Name:  Appier Bid Adapter
+Module Type:  Bidder Adapter
+Maintainer: apn-dev@appier.com
+```
+
+# Description
+
+Connects to Appier exchange for bids.
+
+NOTE:
+- Appier bid adapter only supports Banner at the moment.
+- Multi-currency is not supported. Please make sure you have correct DFP currency settings according to your deal with Appier.
+
+# Sample Ad Unit Config
+```
+var adUnits = [
+   // Banner adUnit
+   {
+      code: 'banner-div',
+      mediaTypes: {
+        banner: {
+          sizes: [[300, 250], [300,600]]
+        }
+      },
+      bids: [{
+         bidder: 'appier',
+         params: {
+           hzid: 'WhM5WIOp'
+         }
+       }]
+   }
+];
+```
+
+# Additional Config (Optional)
+Set the "farm" to use region-specific server
+```
+  // use the bid server in Taiwan (country code: tw)
+  pbjs.setConfig({
+    appier: {
+      'farm': 'tw'
+    }
+  });
+```
+
+Explicitly override the bid server used for bidding
+```
+  // use the bid server specified and override the default
+  pbjs.setConfig({
+    appier: {
+      'server': '${HOST_NAME_OF_THE_SERVER}'
+    }
+  });
+```

test/spec/modules/appierBidAdapter_spec.js

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+import { expect } from 'chai';
+import { spec, API_SERVERS_MAP, ADAPTER_VERSION } from 'modules/appierBidAdapter';
+import { newBidder } from 'src/adapters/bidderFactory';
+import { config } from 'src/config';
+
+describe('AppierAdapter', function () {
+  const adapter = newBidder(spec);
+
+  describe('inherited functions', function () {
+    it('exists and is a function', function () {
+      expect(adapter.callBids).to.exist.and.to.be.a('function');
+    });
+  });
+
+  describe('isBidRequestValid', function () {
+    let bid = {
+      'bidder': 'appier',
+      'params': {
+        'hzid': 'abcd'
+      },
+      'adUnitCode': 'adunit-code',
+      'sizes': [[300, 250], [300, 600]],
+      'bidId': '30b31c1838de1e',
+      'bidderRequestId': '22edbae2733bf6',
+      'auctionId': '1d1a030790a475',
+    };
+
+    it('should return true when required params zoneId found', function () {
+      expect(spec.isBidRequestValid(bid)).to.equal(true);
+    });
+
+    it('should return false when required param zoneId is missing', function () {
+      let bid = Object.assign({}, bid);
+      bid.params = {};
+      expect(spec.isBidRequestValid(bid)).to.equal(false);
+    });
+
+    it('should return false when required param zoneId has wrong type', function () {
+      let bid = Object.assign({}, bid);
+      bid.params = {
+        'hzid': null
+      };
+      expect(spec.isBidRequestValid(bid)).to.equal(false);
+    });
+  });
+
+  describe('buildRequests', function() {
+    it('should return an empty list when there are no bid requests', function() {
+      const fakeBidRequests = [];
+      const fakeBidderRequest = {};
+      expect(spec.buildRequests(fakeBidRequests, fakeBidderRequest)).to.be.an('array').that.is.empty;
+    });
+
+    it('should generate a POST bid request with method, url, and data fields', function() {
+      const bid = {
+        'bidder': 'appier',
+        'params': {
+          'hzid': 'abcd'
+        },
+        'adUnitCode': 'adunit-code',
+        'sizes': [[300, 250], [300, 600]],
+        'bidId': '30b31c1838de1e',
+        'bidderRequestId': '22edbae2733bf6',
+        'auctionId': '1d1a030790a475',
+      };
+      const fakeBidRequests = [bid];
+      const fakeBidderRequest = {refererInfo: {
+        'referer': 'fakeReferer',
+        'reachedTop': true,
+        'numIframes': 1,
+        'stack': []
+      }};
+
+      const builtRequests = spec.buildRequests(fakeBidRequests, fakeBidderRequest);
+      expect(builtRequests.length).to.equal(1);
+      expect(builtRequests[0].method).to.equal('POST');
+      expect(builtRequests[0].url).match(/v1\/prebid\/bid/);
+      expect(builtRequests[0].data).deep.equal({
+        'bids': fakeBidRequests,
+        'refererInfo': fakeBidderRequest.refererInfo,
+        'version': ADAPTER_VERSION
+      });
+    });
+  });
+
+  describe('interpretResponse', function() {
+    const bid = {
+      'bidder': 'appier',
+      'params': {
+        'hzid': 'abcd'
+      },
+      'adUnitCode': 'adunit-code',
+      'sizes': [[300, 250], [300, 600]],
+      'bidId': '30b31c1838de1e',
+      'bidderRequestId': '22edbae2733bf6',
+      'auctionId': '1d1a030790a475',
+    };
+    const fakeBidRequests = [bid];
+
+    it('should return an empty aray to indicate no valid bids', function() {
+      const fakeServerResponse = {};
+
+      const bidResponses = spec.interpretResponse(fakeServerResponse, fakeBidRequests);
+
+      expect(bidResponses).is.an('array').that.is.empty;
+    });
+
+    it('should generate correct response array for bidder', function() {
+      const fakeBidResult = {
+        'requestId': '30b31c1838de1e',
+        'cpm': 0.0029346001,
+        'creativeId': 'Idl0P0d5S3Ca5kVWcia-wQ',
+        'width': 300,
+        'height': 250,
+        'currency': 'USD',
+        'netRevenue': true,
+        'ttl': 300,
+        'ad': '<div>fake html</div>',
+        'appierParams': {
+          'hzid': 'test_hzid'
+        }
+      };
+      const fakeServerResponse = {
+        headers: [],
+        body: [fakeBidResult]
+      };
+
+      const bidResponses = spec.interpretResponse(fakeServerResponse, fakeBidRequests);
+      expect(bidResponses).deep.equal([fakeBidResult]);
+    });
+  });
+
+  describe('getApiServer', function() {
+    it('should use the server specified by setConfig(appier.server)', function() {
+      config.setConfig({
+        'appier': {'server': 'fake_server'}
+      });
+
+      const server = spec.getApiServer();
+
+      expect(server).equals('fake_server');
+    });
+
+    it('should retrieve a farm specific hostname if server is not specpfied', function() {
+      config.setConfig({
+        'appier': {'farm': 'tw'}
+      });
+
+      const server = spec.getApiServer();
+
+      expect(server).equals(API_SERVERS_MAP['tw']);
+    });
+
+    it('if farm is not recognized, use the default farm', function() {
+      config.setConfig({
+        'appier': {'farm': 'no_this_farm'}
+      });
+
+      const server = spec.getApiServer();
+
+      expect(server).equals(API_SERVERS_MAP['default']);
+    });
+
+    it('if farm is not specified, use the default farm', function() {
+      config.setConfig({
+        'appier': {}
+      });
+
+      const server = spec.getApiServer();
+
+      expect(server).equals(API_SERVERS_MAP['default']);
+    });
+  });
+});