feat: add regions endpoint for proxies feature (#7277)

* feat: add regions endpoint for proxies feature

coderd/workspaceproxies_test.go

@@ -0,0 +1,67 @@
+package coderd_test
+
+import (
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/require"
+
+	"github.com/coder/coder/coderd/coderdtest"
+	"github.com/coder/coder/coderd/database/dbtestutil"
+	"github.com/coder/coder/codersdk"
+	"github.com/coder/coder/testutil"
+)
+
+func TestRegions(t *testing.T) {
+	t.Parallel()
+
+	t.Run("OK", func(t *testing.T) {
+		t.Parallel()
+		const appHostname = "*.apps.coder.test"
+
+		db, pubsub := dbtestutil.NewDB(t)
+		deploymentID := uuid.New()
+
+		ctx := testutil.Context(t, testutil.WaitLong)
+		err := db.InsertDeploymentID(ctx, deploymentID.String())
+		require.NoError(t, err)
+
+		client := coderdtest.New(t, &coderdtest.Options{
+			AppHostname: appHostname,
+			Database:    db,
+			Pubsub:      pubsub,
+		})
+		_ = coderdtest.CreateFirstUser(t, client)
+
+		regions, err := client.Regions(ctx)
+		require.NoError(t, err)
+
+		require.Len(t, regions, 1)
+		require.NotEqual(t, uuid.Nil, regions[0].ID)
+		require.Equal(t, regions[0].ID, deploymentID)
+		require.Equal(t, "primary", regions[0].Name)
+		require.Equal(t, "Default", regions[0].DisplayName)
+		require.NotEmpty(t, regions[0].IconURL)
+		require.True(t, regions[0].Healthy)
+		require.Equal(t, client.URL.String(), regions[0].PathAppURL)
+		require.Equal(t, appHostname, regions[0].WildcardHostname)
+
+		// Ensure the primary region ID is constant.
+		regions2, err := client.Regions(ctx)
+		require.NoError(t, err)
+		require.Equal(t, regions[0].ID, regions2[0].ID)
+	})
+
+	t.Run("RequireAuth", func(t *testing.T) {
+		t.Parallel()
+
+		ctx := testutil.Context(t, testutil.WaitLong)
+		client := coderdtest.New(t, nil)
+		_ = coderdtest.CreateFirstUser(t, client)
+
+		unauthedClient := codersdk.New(client.URL)
+		regions, err := unauthedClient.Regions(ctx)
+		require.Error(t, err)
+		require.Empty(t, regions)
+	})
+}