Plugin framework: add ability to install other plugins to the… (#12232)

* add ability to upload other plugins to the plugin API

* generated client rpc glue code

* fix UploadPlugin API signature

* generated plugin mocks

* added upload plugin test

* removed unused comment

* using single line to call InstallPlugin with file Reader

* fix minimum server version

* added successful plugin upload test

* renamed UploadPlugin to InstallPlugin

app/plugin_api_test.go

@@ -21,6 +21,7 @@ import (
 	"github.com/mattermost/mattermost-server/plugin"
 	"github.com/mattermost/mattermost-server/services/mailservice"
 	"github.com/mattermost/mattermost-server/utils"
+	"github.com/mattermost/mattermost-server/utils/fileutils"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -684,6 +685,43 @@ func TestPluginAPIGetPlugins(t *testing.T) {
 	assert.Equal(t, pluginManifests, plugins)
 }
 
+func TestPluginAPIInstallPlugin(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+	api := th.SetupPluginAPI()
+
+	path, _ := fileutils.FindDir("tests")
+	tarData, err := ioutil.ReadFile(filepath.Join(path, "testplugin.tar.gz"))
+	require.NoError(t, err)
+
+	_, err = api.InstallPlugin(bytes.NewReader(tarData), true)
+	assert.NotNil(t, err, "should not allow upload if upload disabled")
+	assert.Equal(t, err.Error(), "installPlugin: Plugins and/or plugin uploads have been disabled., ")
+
+	th.App.UpdateConfig(func(cfg *model.Config) {
+		*cfg.PluginSettings.Enable = true
+		*cfg.PluginSettings.EnableUploads = true
+	})
+
+	manifest, err := api.InstallPlugin(bytes.NewReader(tarData), true)
+	defer os.RemoveAll("plugins/testplugin")
+	require.Nil(t, err)
+	assert.Equal(t, "testplugin", manifest.Id)
+
+	// Successfully installed
+	pluginsResp, err := api.GetPlugins()
+	require.Nil(t, err)
+
+	found := false
+	for _, m := range pluginsResp {
+		if m.Id == manifest.Id {
+			found = true
+		}
+	}
+
+	assert.True(t, found)
+}
+
 func TestPluginAPIGetTeamIcon(t *testing.T) {
 	th := Setup(t).InitBasic()
 	defer th.TearDown()