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

plugin/client_rpc_generated.go

@@ -8,6 +8,7 @@ package plugin
 
 import (
 	"fmt"
+	"io"
 	"log"
 
 	"github.com/mattermost/mattermost-server/mlog"
@@ -3488,6 +3489,36 @@ func (s *apiRPCServer) GetPluginStatus(args *Z_GetPluginStatusArgs, returns *Z_G
 	return nil
 }
 
+type Z_InstallPluginArgs struct {
+	A io.Reader
+	B bool
+}
+
+type Z_InstallPluginReturns struct {
+	A *model.Manifest
+	B *model.AppError
+}
+
+func (g *apiRPCClient) InstallPlugin(file io.Reader, replace bool) (*model.Manifest, *model.AppError) {
+	_args := &Z_InstallPluginArgs{file, replace}
+	_returns := &Z_InstallPluginReturns{}
+	if err := g.client.Call("Plugin.InstallPlugin", _args, _returns); err != nil {
+		log.Printf("RPC call to InstallPlugin API failed: %s", err.Error())
+	}
+	return _returns.A, _returns.B
+}
+
+func (s *apiRPCServer) InstallPlugin(args *Z_InstallPluginArgs, returns *Z_InstallPluginReturns) error {
+	if hook, ok := s.impl.(interface {
+		InstallPlugin(file io.Reader, replace bool) (*model.Manifest, *model.AppError)
+	}); ok {
+		returns.A, returns.B = hook.InstallPlugin(args.A, args.B)
+	} else {
+		return encodableError(fmt.Errorf("API InstallPlugin called but not implemented."))
+	}
+	return nil
+}
+
 type Z_KVSetArgs struct {
 	A string
 	B []byte