Add enums to sort by browser feature support

lib/gcpspanner/spanneradapters/backend.go

@@ -555,12 +555,13 @@ func (s *Backend) FeaturesSearch(
 }
 
 // TODO: Pass in context to be used by slog.ErrorContext.
+// nolint: gocyclo // WONTFIX. Keep all the cases here so that the exhaustive
+// linter can catch a missing case.
 func getFeatureSearchSortOrder(
 	sortOrder *backend.ListFeaturesParamsSort) gcpspanner.Sortable {
 	if sortOrder == nil {
 		return gcpspanner.NewBaselineStatusSort(false)
 	}
-	// nolint: exhaustive // Remove once we support all the cases.
 	switch *sortOrder {
 	case backend.NameAsc:
 		return gcpspanner.NewFeatureNameSort(true)
@@ -606,6 +607,22 @@ func getFeatureSearchSortOrder(
 		return gcpspanner.NewChromiumUsageSort(true)
 	case backend.ChromiumUsageDesc:
 		return gcpspanner.NewChromiumUsageSort(false)
+	case backend.AvailabilityChromeAsc:
+		return gcpspanner.NewBrowserFeatureSupportSort(true, string(backend.Chrome))
+	case backend.AvailabilityChromeDesc:
+		return gcpspanner.NewBrowserFeatureSupportSort(false, string(backend.Chrome))
+	case backend.AvailabilityEdgeAsc:
+		return gcpspanner.NewBrowserFeatureSupportSort(true, string(backend.Edge))
+	case backend.AvailabilityEdgeDesc:
+		return gcpspanner.NewBrowserFeatureSupportSort(false, string(backend.Edge))
+	case backend.AvailabilityFirefoxAsc:
+		return gcpspanner.NewBrowserFeatureSupportSort(true, string(backend.Firefox))
+	case backend.AvailabilityFirefoxDesc:
+		return gcpspanner.NewBrowserFeatureSupportSort(false, string(backend.Firefox))
+	case backend.AvailabilitySafariAsc:
+		return gcpspanner.NewBrowserFeatureSupportSort(true, string(backend.Safari))
+	case backend.AvailabilitySafariDesc:
+		return gcpspanner.NewBrowserFeatureSupportSort(false, string(backend.Safari))
 	}
 
 	// Unknown sort order

lib/gcpspanner/spanneradapters/backend_test.go

@@ -1336,6 +1336,38 @@ func TestGetFeatureSearchSortOrder(t *testing.T) {
 			input: valuePtr(backend.StableSafariDesc),
 			want:  gcpspanner.NewBrowserImplSort(false, "safari", true),
 		},
+		{
+			input: valuePtr(backend.AvailabilityChromeAsc),
+			want:  gcpspanner.NewBrowserFeatureSupportSort(true, "chrome"),
+		},
+		{
+			input: valuePtr(backend.AvailabilityChromeDesc),
+			want:  gcpspanner.NewBrowserFeatureSupportSort(false, "chrome"),
+		},
+		{
+			input: valuePtr(backend.AvailabilityEdgeAsc),
+			want:  gcpspanner.NewBrowserFeatureSupportSort(true, "edge"),
+		},
+		{
+			input: valuePtr(backend.AvailabilityEdgeDesc),
+			want:  gcpspanner.NewBrowserFeatureSupportSort(false, "edge"),
+		},
+		{
+			input: valuePtr(backend.AvailabilityFirefoxAsc),
+			want:  gcpspanner.NewBrowserFeatureSupportSort(true, "firefox"),
+		},
+		{
+			input: valuePtr(backend.AvailabilityFirefoxDesc),
+			want:  gcpspanner.NewBrowserFeatureSupportSort(false, "firefox"),
+		},
+		{
+			input: valuePtr(backend.AvailabilitySafariAsc),
+			want:  gcpspanner.NewBrowserFeatureSupportSort(true, "safari"),
+		},
+		{
+			input: valuePtr(backend.AvailabilitySafariDesc),
+			want:  gcpspanner.NewBrowserFeatureSupportSort(false, "safari"),
+		},
 	}
 
 	for _, tt := range sortOrderTests {

openapi/backend/openapi.yaml

@@ -76,6 +76,15 @@ paths:
               - experimental_firefox_desc
               - chromium_usage_asc
               - chromium_usage_desc
+              # availability_{browser}_{direction}
+              - availability_chrome_asc
+              - availability_chrome_desc
+              - availability_edge_asc
+              - availability_edge_desc
+              - availability_firefox_asc
+              - availability_firefox_desc
+              - availability_safari_asc
+              - availability_safari_desc
       responses:
         '200':
           description: OK