[MM-28885] app/plugin: check if plugin manifest has errors (#15630)

* app/plugin: dont sync plugins with errors

* reflect review comments

* update test

* Update plugin/environment_test.go

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>

* reflect review comments

* reflect review comments

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>

plugin/environment.go

@@ -86,7 +86,8 @@ func scanSearchPath(path string) ([]*model.BundleInfo, error) {
 		if !file.IsDir() || file.Name()[0] == '.' {
 			continue
 		}
-		if info := model.BundleInfoForPath(filepath.Join(path, file.Name())); info.ManifestPath != "" {
+		info := model.BundleInfoForPath(filepath.Join(path, file.Name()))
+		if info.Manifest != nil {
 			ret = append(ret, info)
 		}
 	}

plugin/environment_test.go

@@ -0,0 +1,71 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package plugin
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAvaliablePlugins(t *testing.T) {
+	dir, err1 := ioutil.TempDir("", "mm-plugin-test")
+	require.NoError(t, err1)
+	t.Cleanup(func() {
+		os.RemoveAll(dir)
+	})
+
+	env := Environment{
+		pluginDir: dir,
+	}
+
+	t.Run("Should be able to load available plugins", func(t *testing.T) {
+		bundle1 := model.BundleInfo{
+			ManifestPath: "",
+			Manifest: &model.Manifest{
+				Id:      "someid",
+				Version: "1",
+			},
+		}
+		err := os.Mkdir(filepath.Join(dir, "plugin1"), 0700)
+		require.NoError(t, err)
+		defer os.RemoveAll(filepath.Join(dir, "plugin1"))
+
+		path := filepath.Join(dir, "plugin1", "plugin.json")
+		err = ioutil.WriteFile(path, []byte(bundle1.Manifest.ToJson()), 0644)
+		require.NoError(t, err)
+
+		bundles, err := env.Available()
+		require.NoError(t, err)
+		require.Len(t, bundles, 1)
+	})
+
+	t.Run("Should not be able to load plugins without a valid manifest file", func(t *testing.T) {
+		err := os.Mkdir(filepath.Join(dir, "plugin2"), 0700)
+		require.NoError(t, err)
+		defer os.RemoveAll(filepath.Join(dir, "plugin2"))
+
+		path := filepath.Join(dir, "plugin2", "manifest.json")
+		err = ioutil.WriteFile(path, []byte("{}"), 0644)
+		require.NoError(t, err)
+
+		bundles, err := env.Available()
+		require.NoError(t, err)
+		require.Len(t, bundles, 0)
+	})
+
+	t.Run("Should not be able to load plugins without a manifest file", func(t *testing.T) {
+		err := os.Mkdir(filepath.Join(dir, "plugin3"), 0700)
+		require.NoError(t, err)
+		defer os.RemoveAll(filepath.Join(dir, "plugin3"))
+
+		bundles, err := env.Available()
+		require.NoError(t, err)
+		require.Len(t, bundles, 0)
+	})
+}