✨ Add requestOrigin field in analytics config

extensions/amp-analytics/0.1/config.js

@@ -475,7 +475,8 @@ export function expandConfigRequest(config) {
       config['requests'][k] = expandRequestStr(config['requests'][k]);
     }
   }
-  return config;
+
+  return handleTopLevelAttributes_(config);
 }
 
 /**
@@ -490,3 +491,24 @@ function expandRequestStr(request) {
     'baseUrl': request,
   };
 }
+
+/**
+ * Handles top level fields in the given config
+ * @param {!JsonObject} config
+ * @return {JsonObject}
+ */
+function handleTopLevelAttributes_(config) {
+  // handle a top level requestOrigin
+  if (hasOwn(config, 'requests') && hasOwn(config, 'requestOrigin')) {
+    const requestOrigin = config['requestOrigin'];
+
+    for (const requestName in config['requests']) {
+      // only add top level request origin into request if it doesn't have one
+      if (!hasOwn(config['requests'][requestName], 'origin')) {
+        config['requests'][requestName]['origin'] = requestOrigin;
+      }
+    }
+  }
+
+  return config;
+}

extensions/amp-analytics/0.1/requests.js

@@ -47,6 +47,9 @@ export class RequestHandler {
     /** @const {!Window} */
     this.win = this.ampdoc_.win;
 
+    /** @const {string} !if specified, all requests are prepended with this */
+    this.requestOrigin_ = request['origin'];
+
     /** @const {string} */
     this.baseUrl = devAssert(request['baseUrl']);
 
@@ -65,12 +68,18 @@ export class RequestHandler {
     /** @private {!../../../src/service/url-replacements-impl.UrlReplacements} */
     this.urlReplacementService_ = Services.urlReplacementsForDoc(element);
 
+    /** @private {!../../../src/service/url-impl.Url} */
+    this.urlService_ = Services.urlForDoc(element);
+
     /** @private {?Promise<string>} */
     this.baseUrlPromise_ = null;
 
     /** @private {?Promise<string>} */
     this.baseUrlTemplatePromise_ = null;
 
+    /** @private {?Promise<string>} */
+    this.requestOriginPromise_ = null;
+
     /** @private {!Array<!Promise<!BatchSegmentDef>>} */
     this.batchSegmentPromises_ = [];
 
@@ -133,10 +142,12 @@ export class RequestHandler {
 
     if (!this.baseUrlPromise_) {
       expansionOption.freezeVar('extraUrlParams');
+
       this.baseUrlTemplatePromise_ = this.variableService_.expandTemplate(
         this.baseUrl,
         expansionOption
       );
+
       this.baseUrlPromise_ = this.baseUrlTemplatePromise_.then(baseUrl => {
         return this.urlReplacementService_.expandUrlAsync(
           baseUrl,
@@ -146,6 +157,29 @@ export class RequestHandler {
       });
     }
 
+    // expand requestOrigin if it is declared
+    if (!this.requestOriginPromise_ && this.requestOrigin_) {
+      // do not encode vars in request origin
+      const requestOriginExpansionOpt = new ExpansionOptions(
+        expansionOption.vars,
+        expansionOption.iterations,
+        true // opt_noEncode
+      );
+
+      this.requestOriginPromise_ = this.variableService_
+        // expand variables in request origin
+        .expandTemplate(this.requestOrigin_, requestOriginExpansionOpt)
+        // substitute in URL values e.g. DOCUMENT_REFERRER -> https://example.com
+        .then(expandedRequestOrigin => {
+          return this.urlReplacementService_.expandUrlAsync(
+            expandedRequestOrigin,
+            bindings,
+            this.whiteList_,
+            true // opt_noEncode
+          );
+        });
+    }
+
     const params = Object.assign({}, configParams, trigger['extraUrlParams']);
     const timestamp = this.win.Date.now();
     const batchSegmentPromise = expandExtraUrlParams(
@@ -207,38 +241,48 @@ export class RequestHandler {
    */
   fire_() {
     const {
+      requestOriginPromise_: requestOriginPromise,
       baseUrlTemplatePromise_: baseUrlTemplatePromise,
       baseUrlPromise_: baseUrlPromise,
       batchSegmentPromises_: segmentPromises,
     } = this;
     const trigger = /** @type {!JsonObject} */ (this.lastTrigger_);
     this.reset_();
 
-    baseUrlTemplatePromise.then(preUrl => {
+    // preconnect to requestOrigin if available, otherwise baseUrlTemplate
+    const preconnectPromise = requestOriginPromise
+      ? requestOriginPromise
+      : baseUrlTemplatePromise;
+
+    preconnectPromise.then(preUrl => {
       this.preconnect_.url(preUrl, true);
-      Promise.all([baseUrlPromise, Promise.all(segmentPromises)]).then(
-        results => {
-          const baseUrl = results[0];
-          const batchSegments = results[1];
-          if (batchSegments.length === 0) {
-            return;
-          }
-          // TODO: iframePing will not work with batch. Add a config validation.
-          if (trigger['iframePing']) {
-            userAssert(
-              trigger['on'] == 'visible',
-              'iframePing is only available on page view requests.'
-            );
-            this.transport_.sendRequestUsingIframe(baseUrl, batchSegments[0]);
-          } else {
-            this.transport_.sendRequest(
-              baseUrl,
-              batchSegments,
-              !!this.batchInterval_
-            );
-          }
-        }
-      );
+    });
+
+    Promise.all([
+      baseUrlPromise,
+      Promise.all(segmentPromises),
+      requestOriginPromise,
+    ]).then(results => {
+      const requestUrl = this.composeRequestUrl_(results[0], results[2]);
+
+      const batchSegments = results[1];
+      if (batchSegments.length === 0) {
+        return;
+      }
+      // TODO: iframePing will not work with batch. Add a config validation.
+      if (trigger['iframePing']) {
+        userAssert(
+          trigger['on'] == 'visible',
+          'iframePing is only available on page view requests.'
+        );
+        this.transport_.sendRequestUsingIframe(requestUrl, batchSegments[0]);
+      } else {
+        this.transport_.sendRequest(
+          requestUrl,
+          batchSegments,
+          !!this.batchInterval_
+        );
+      }
     });
   }
 
@@ -325,6 +369,25 @@ export class RequestHandler {
       this.refreshBatchInterval_();
     }, interval);
   }
+
+  /**
+   * Composes a request URL given a base and requestOrigin
+   * @private
+   * @param {string} baseUrl
+   * @param {string=} opt_requestOrigin
+   * @return {string}
+   */
+  composeRequestUrl_(baseUrl, opt_requestOrigin) {
+    if (opt_requestOrigin) {
+      // parse can handle relative request origins and will use the
+      // current page's origin if so. However, we only want to accept absolute
+      // URLs for request origin to keep our URL composition rules simple
+      const requestOriginInfo = this.urlService_.parse(opt_requestOrigin);
+      return requestOriginInfo.origin + baseUrl;
+    }
+
+    return baseUrl;
+  }
 }
 
 /**

extensions/amp-analytics/0.1/test/test-config.js

@@ -36,6 +36,97 @@ describes.realWin('AnalyticsConfig', {amp: false}, env => {
     delete ANALYTICS_CONFIG['-test-venfor'];
   });
 
+  describe('handles top level fields correctly', () => {
+    it('propogates requestOrigin into each request object', () => {
+      ANALYTICS_CONFIG['-test-venfor'] = {
+        'requestOrigin': 'https://example.com',
+        'requests': {'test1': '/test1', 'test2': '/test1/test2'},
+      };
+
+      const element = getAnalyticsTag({}, {'type': '-test-venfor'});
+
+      return new AnalyticsConfig(element).loadConfig().then(config => {
+        expect(config['requests']).to.deep.equal({
+          'test1': {
+            origin: 'https://example.com',
+            baseUrl: '/test1',
+          },
+          'test2': {
+            origin: 'https://example.com',
+            baseUrl: '/test1/test2',
+          },
+        });
+      });
+    });
+
+    it('does not overwrite existing origin in request object', () => {
+      ANALYTICS_CONFIG['-test-venfor'] = {
+        'requestOrigin': 'https://toplevel.com',
+        'requests': {
+          'test1': {
+            origin: 'https://nested.com',
+            baseUrl: '/test1',
+          },
+        },
+      };
+
+      const element = getAnalyticsTag({}, {'type': '-test-venfor'});
+
+      return new AnalyticsConfig(element).loadConfig().then(config => {
+        expect(config['requests']).to.deep.equal({
+          'test1': {
+            origin: 'https://nested.com',
+            baseUrl: '/test1',
+          },
+        });
+      });
+    });
+
+    it('handles empty string request origin', () => {
+      ANALYTICS_CONFIG['-test-venfor'] = {
+        'requestOrigin': '',
+        'requests': {
+          'test1': {
+            baseUrl: '/test1',
+          },
+        },
+      };
+
+      const element = getAnalyticsTag({}, {'type': '-test-venfor'});
+
+      return new AnalyticsConfig(element).loadConfig().then(config => {
+        expect(config['requests']).to.deep.equal({
+          'test1': {
+            origin: '',
+            baseUrl: '/test1',
+          },
+        });
+      });
+    });
+
+    it('handles undefined request origin', () => {
+      ANALYTICS_CONFIG['-test-venfor'] = {
+        'requestOrigin': undefined,
+        'requests': {
+          'test1': {
+            baseUrl: '/test1',
+          },
+        },
+      };
+
+      const element = getAnalyticsTag({}, {'type': '-test-venfor'});
+
+      return new AnalyticsConfig(element).loadConfig().then(config => {
+        expect(config['requests']).to.deep.equal({
+          'test1': {
+            origin: undefined,
+            baseUrl: '/test1',
+          },
+        });
+      });
+    });
+  });
+
   describe('merges requests correctly', () => {
     it('inline and vendor both string', () => {
       ANALYTICS_CONFIG['-test-venfor'] = {