core(installable-manifest): expose app manifest url

lighthouse-cli/test/smokehouse/test-definitions/pwa/pwa2-expectations.js

@@ -116,7 +116,7 @@ module.exports = [
         },
         'installable-manifest': {
           score: 1,
-          details: {items: [pwaDetailsExpectations]},
+          details: {items: [{...pwaDetailsExpectations, manifestUrl: 'https://caltrainschedule.io/manifest.json'}]},
         },
         'splash-screen': {
           score: 1,

lighthouse-core/audits/installable-manifest.js

@@ -89,17 +89,20 @@ class InstallableManifest extends MultiCheckAudit {
   /**
    * @param {LH.Artifacts} artifacts
    * @param {LH.Audit.Context} context
-   * @return {Promise<{failures: Array<string>, manifestValues: LH.Artifacts.ManifestValues}>}
+   * @return {Promise<{failures: Array<string>, manifestValues: LH.Artifacts.ManifestValues, manifestUrl: string | null}>}
    */
   static async audit_(artifacts, context) {
     const manifestValues = await ManifestValues.request(artifacts, context);
     const manifestFailures = InstallableManifest.assessManifest(manifestValues);
 
+    const manifestUrl = artifacts.WebAppManifest ? artifacts.WebAppManifest.url : null;
+
     return {
       failures: [
         ...manifestFailures,
       ],
       manifestValues,
+      manifestUrl,
     };
   }
 }

lighthouse-core/lib/manifest-parser.js

@@ -472,6 +472,7 @@ function parse(string, manifestUrl, documentUrl) {
       raw: string,
       value: undefined,
       warning: 'ERROR: file isn\'t valid JSON: ' + e,
+      url: manifestUrl,
     };
   }
 
@@ -505,6 +506,7 @@ function parse(string, manifestUrl, documentUrl) {
     raw: string,
     value: manifest,
     warning: manifestUrlWarning,
+    url: manifestUrl,
   };
 }
 

lighthouse-core/test/audits/installable-manifest-test.js

@@ -44,6 +44,16 @@ describe('PWA: webapp install banner audit', () => {
       });
     });
 
+    it('passes when manifest url matches', () => {
+      const artifacts = generateMockArtifacts();
+      const context = generateMockAuditContext();
+
+      return InstallableManifestAudit.audit(artifacts, context).then(result => {
+        assert.strictEqual(artifacts.WebAppManifest.url, EXAMPLE_MANIFEST_URL);
+        assert.strictEqual(result.details.items[0].manifestUrl, EXAMPLE_MANIFEST_URL);
+      });
+    });
+
     it('fails with a non-parsable manifest', () => {
       const artifacts = generateMockArtifacts('{,:}');
       const context = generateMockAuditContext();

lighthouse-core/test/gather/gather-runner-test.js

@@ -1803,6 +1803,7 @@ describe('GatherRunner', function() {
         name: {value: 'App', raw: 'App'},
         start_url: {value: passContext.url, raw: undefined},
       });
+      expect(result && result.url).toMatch(MANIFEST_URL);
     });
   });
 });

lighthouse-core/test/results/sample_v2.json

@@ -509,6 +509,7 @@
             "failures": [
               "No manifest was fetched"
             ],
+            "manifestUrl": null,
             "isParseFailure": true,
             "parseFailureReason": "No manifest was fetched"
           }