fix(privacy): stop matching ads inside ordinary identifiers

internal/privacy/scanner.go

@@ -107,7 +107,7 @@ var trackingSDKPatterns = []struct {
 	{regexp.MustCompile(`(?i)(mixpanel)`), "Mixpanel"},
 	{regexp.MustCompile(`(?i)(@segment/|analytics-react-native)`), "Segment"},
 	{regexp.MustCompile(`(?i)(branch\.io|react-native-branch)`), "Branch"},
-	{regexp.MustCompile(`(?i)(google.*ads|GADMobileAds|admob)`), "Google Ads/AdMob"},
+	{regexp.MustCompile(`(?i)(googlemobileads|google-mobile-ads|GADMobileAds|GADApplicationIdentifier|\badmob)`), "Google Ads/AdMob"},
 	{regexp.MustCompile(`(?i)(unity.*ads|UnityAds)`), "Unity Ads"},
 	{regexp.MustCompile(`(?i)(applovin|AppLovinSDK)`), "AppLovin"},
 	{regexp.MustCompile(`(?i)(ironSource|IronSource)`), "ironSource"},

internal/privacy/scanner_test.go

@@ -39,3 +39,81 @@ func TestRequiredReasonDetectsRealCallSites(t *testing.T) {
 		}
 	}
 }
+
+// The Google Ads/AdMob pattern used to be `google.*ads`, which is unanchored and
+// case-insensitive, so `ads` matched inside ordinary identifiers — `loadSdk`,
+// `downloads`, `uploads`, `threads`. Any app that touched a non-ad Google SDK and
+// happened to have one of those words on the same line got a CRITICAL §5.1.2
+// finding telling it to add an ATT prompt it does not need, and `--exit-code`
+// failed the build. https://github.com/RevylAI/greenlight/issues/30
+func TestGoogleAdsPatternIgnoresOrdinaryIdentifiers(t *testing.T) {
+	clean := []struct {
+		name    string
+		file    string
+		content string
+	}{
+		{"google sign-in with loadSdk", "googleSignIn.ts",
+			"GoogleSignin: Awaited<ReturnType<typeof loadSdk>>[\"GoogleSignin\"],\n"},
+		{"google with downloads", "Downloads.swift",
+			"let googleDriveDownloads = try await drive.downloads()\n"},
+		{"google with threads", "Threads.ts",
+			"const googleClient = build(); // threads are reused here\n"},
+		{"google with uploads", "Uploads.ts",
+			"import { GoogleAuthProvider } from \"firebase/auth\"; const uploads = [];\n"},
+	}
+
+	for _, tc := range clean {
+		t.Run(tc.name, func(t *testing.T) {
+			dir := t.TempDir()
+			writeFile(t, dir, tc.file, tc.content)
+
+			res, err := Scan(dir)
+			if err != nil {
+				t.Fatalf("Scan: %v", err)
+			}
+			for _, sdk := range res.TrackingSDKs {
+				if sdk == "Google Ads/AdMob" {
+					t.Errorf("reported Google Ads/AdMob for an app with no ad SDK; content=%q", tc.content)
+				}
+			}
+		})
+	}
+}
+
+// Anchoring the pattern must not cost us any real AdMob integration. These are the
+// forms that appear in the file types detectLang actually scans — Swift, Objective-C
+// and JS/TS. Manifest files like Info.plist, Podfile and package.json are not scanned
+// at all today, so GADApplicationIdentifier is kept in the pattern for the Swift and
+// Objective-C call sites rather than for the plist key.
+func TestGoogleAdsPatternStillDetectsRealIntegrations(t *testing.T) {
+	real := []struct {
+		name    string
+		file    string
+		content string
+	}{
+		{"swift import", "Ads.swift", "import GoogleMobileAds\n"},
+		{"swift api", "Ads.swift", "GADMobileAds.sharedInstance().start(completionHandler: nil)\n"},
+		{"objc identifier", "Ads.m", "NSString *key = @\"GADApplicationIdentifier\";\n"},
+		{"react native import", "ads.ts", "import mobileAds from 'react-native-google-mobile-ads';\n"},
+		{"expo admob component", "Banner.tsx", "import { AdMobBanner } from 'expo-ads-admob';\n"},
+		{"bare admob token", "ads.js", "const admob = require('admob');\n"},
+	}
+
+	for _, tc := range real {
+		t.Run(tc.name, func(t *testing.T) {
+			dir := t.TempDir()
+			writeFile(t, dir, tc.file, tc.content)
+
+			res, err := Scan(dir)
+			if err != nil {
+				t.Fatalf("Scan: %v", err)
+			}
+			for _, sdk := range res.TrackingSDKs {
+				if sdk == "Google Ads/AdMob" {
+					return
+				}
+			}
+			t.Errorf("missed a real AdMob integration; content=%q TrackingSDKs=%v", tc.content, res.TrackingSDKs)
+		})
+	}
+}