[MM-53968] Includes mattermost-plugin-api into the mono repo (#24235)

Include https://github.com/mattermost/mattermost-plugin-api into the mono repo

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
Co-authored-by: Michael Kochell <mjkochell@gmail.com>
Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>
Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
Co-authored-by: Alex Dovenmuehle <alex.dovenmuehle@mattermost.com>
Co-authored-by: Michael Kochell <6913320+mickmister@users.noreply.github.com>
Co-authored-by: Christopher Poile <cpoile@gmail.com>
Co-authored-by: İlker Göktuğ Öztürk <ilkergoktugozturk@gmail.com>
Co-authored-by: Shota Gvinepadze <wineson@gmail.com>
Co-authored-by: Ali Farooq <ali.farooq0@pm.me>
Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>
Co-authored-by: Daniel Espino García <larkox@gmail.com>
Co-authored-by: Christopher Speller <crspeller@gmail.com>
Co-authored-by: Alex Dovenmuehle <adovenmuehle@gmail.com>
Co-authored-by: Szymon Gibała <szymongib@gmail.com>
Co-authored-by: Lev <1187448+levb@users.noreply.github.com>
Co-authored-by: Jason Frerich <jason.frerich@mattermost.com>
Co-authored-by: Agniva De Sarker <agnivade@yahoo.co.in>
Co-authored-by: Artur M. Wolff <artur.m.wolff@gmail.com>
Co-authored-by: Madhav Hugar <16546715+madhavhugar@users.noreply.github.com>
Co-authored-by: Joe <security.joe@pm.me>
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>
Co-authored-by: José Peso <trilopin@users.noreply.github.com>

server/public/pluginapi/system_test.go

@@ -0,0 +1,104 @@
+package pluginapi_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/pkg/errors"
+	"github.com/stretchr/testify/require"
+
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/plugin/plugintest"
+	"github.com/mattermost/mattermost/server/public/pluginapi"
+)
+
+func TestGetManifest(t *testing.T) {
+	t.Run("valid manifest", func(t *testing.T) {
+		content := []byte(`
+		{
+			"id": "some.id",
+			"name": "Some Name"
+		}
+		`)
+		expectedManifest := &model.Manifest{
+			Id:   "some.id",
+			Name: "Some Name",
+		}
+
+		dir, err := os.MkdirTemp("", "")
+		require.NoError(t, err)
+		defer os.RemoveAll(dir)
+
+		tmpfn := filepath.Join(dir, "plugin.json")
+		//nolint:gosec //only used in tests
+		err = os.WriteFile(tmpfn, content, 0o666)
+		require.NoError(t, err)
+
+		api := &plugintest.API{}
+		api.On("GetBundlePath").Return(dir, nil)
+		defer api.AssertExpectations(t)
+		client := pluginapi.NewClient(api, &plugintest.Driver{})
+		m, err := client.System.GetManifest()
+		require.NoError(t, err)
+		require.Equal(t, expectedManifest, m)
+
+		// Altering the pointer doesn't alter the result
+		m.Id = "new.id"
+
+		m2, err := client.System.GetManifest()
+		require.NoError(t, err)
+		require.Equal(t, expectedManifest, m2)
+	})
+
+	t.Run("GetBundlePath fails", func(t *testing.T) {
+		api := &plugintest.API{}
+		api.On("GetBundlePath").Return("", errors.New(""))
+		defer api.AssertExpectations(t)
+		client := pluginapi.NewClient(api, &plugintest.Driver{})
+		m, err := client.System.GetManifest()
+		require.Error(t, err)
+		require.Nil(t, m)
+	})
+
+	t.Run("No manifest found", func(t *testing.T) {
+		dir, err := os.MkdirTemp("", "")
+		require.NoError(t, err)
+		defer os.RemoveAll(dir)
+
+		api := &plugintest.API{}
+		api.On("GetBundlePath").Return(dir, nil)
+		defer api.AssertExpectations(t)
+		client := pluginapi.NewClient(api, &plugintest.Driver{})
+		m, err := client.System.GetManifest()
+		require.Error(t, err)
+		require.Nil(t, m)
+	})
+}
+
+func TestRequestTrialLicense(t *testing.T) {
+	t.Run("Server version incompatible", func(t *testing.T) {
+		api := &plugintest.API{}
+		defer api.AssertExpectations(t)
+		client := pluginapi.NewClient(api, &plugintest.Driver{})
+
+		api.On("GetServerVersion").Return("5.35.0")
+		err := client.System.RequestTrialLicense("requesterID", 10, true, true)
+
+		require.Error(t, err)
+		require.Equal(t, "current server version is lower than 5.36", err.Error())
+	})
+
+	t.Run("Server version compatible", func(t *testing.T) {
+		api := &plugintest.API{}
+		defer api.AssertExpectations(t)
+		client := pluginapi.NewClient(api, &plugintest.Driver{})
+
+		api.On("GetServerVersion").Return("5.36.0")
+		api.On("RequestTrialLicense", "requesterID", 10, true, true).Return(nil)
+
+		err := client.System.RequestTrialLicense("requesterID", 10, true, true)
+
+		require.NoError(t, err)
+	})
+}