[MM-16700] Add InstallPluginFromUrl helper method (#12994)

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

plugin/helpers_plugin_test.go

@@ -0,0 +1,105 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package plugin_test
+
+import (
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"path/filepath"
+	"testing"
+
+	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/mattermost/mattermost-server/v5/plugin"
+	"github.com/mattermost/mattermost-server/v5/plugin/plugintest"
+	"github.com/mattermost/mattermost-server/v5/plugin/plugintest/mock"
+	"github.com/mattermost/mattermost-server/v5/utils/fileutils"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestInstallPluginFromURL(t *testing.T) {
+	replace := true
+
+	t.Run("incompatible server version", func(t *testing.T) {
+		h := &plugin.HelpersImpl{}
+		api := &plugintest.API{}
+		api.On("GetServerVersion").Return("5.1.0")
+		h.API = api
+
+		_, err := h.InstallPluginFromURL("", true)
+
+		assert.Error(t, err)
+		assert.Equal(t, "incompatible server version for plugin, minimum required version: 5.18.0, current version: 5.1.0", err.Error())
+	})
+
+	t.Run("error while parsing the download url", func(t *testing.T) {
+		h := &plugin.HelpersImpl{}
+		api := &plugintest.API{}
+		api.On("GetServerVersion").Return("5.19.0")
+		h.API = api
+		_, err := h.InstallPluginFromURL("http://%41:8080/", replace)
+
+		assert.Error(t, err)
+		assert.Equal(t, "error while parsing url: parse http://%41:8080/: invalid URL escape \"%41\"", err.Error())
+	})
+
+	t.Run("errors out while downloading file", func(t *testing.T) {
+		h := &plugin.HelpersImpl{}
+		api := &plugintest.API{}
+		api.On("GetServerVersion").Return("5.19.0")
+		h.API = api
+		testServer := httptest.NewServer(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
+			res.WriteHeader(http.StatusInternalServerError)
+		}))
+		defer testServer.Close()
+		url := testServer.URL
+
+		_, err := h.InstallPluginFromURL(url, replace)
+
+		assert.Error(t, err)
+		assert.Equal(t, "received 500 status code while downloading plugin from server", err.Error())
+	})
+
+	t.Run("downloads the file successfully", func(t *testing.T) {
+		h := &plugin.HelpersImpl{}
+		api := &plugintest.API{}
+		api.On("GetServerVersion").Return("5.19.0")
+		h.API = api
+		path, _ := fileutils.FindDir("tests")
+		tarData, err := ioutil.ReadFile(filepath.Join(path, "testplugin.tar.gz"))
+		require.NoError(t, err)
+		expectedManifest := &model.Manifest{Id: "testplugin"}
+		api.On("InstallPlugin", mock.Anything, false).Return(expectedManifest, nil)
+
+		testServer := httptest.NewServer(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
+			res.WriteHeader(http.StatusOK)
+			_, _ = res.Write(tarData)
+		}))
+		defer testServer.Close()
+		url := testServer.URL
+
+		manifest, err := h.InstallPluginFromURL(url, false)
+
+		assert.NoError(t, err)
+		assert.Equal(t, "testplugin", manifest.Id)
+	})
+
+	t.Run("the url pointing to server is incorrect", func(t *testing.T) {
+		h := &plugin.HelpersImpl{}
+		api := &plugintest.API{}
+		api.On("GetServerVersion").Return("5.19.0")
+		h.API = api
+		testServer := httptest.NewServer(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
+			res.WriteHeader(http.StatusNotFound)
+		}))
+		defer testServer.Close()
+		url := testServer.URL
+
+		_, err := h.InstallPluginFromURL(url, false)
+
+		assert.Error(t, err)
+		assert.Equal(t, "received 404 status code while downloading plugin from server", err.Error())
+	})
+}