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.go

@@ -7,6 +7,8 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"io"
+	"io/ioutil"
 	"net/http"
 	"path/filepath"
 	"strings"
@@ -655,6 +657,19 @@ func (api *PluginAPI) GetPluginStatus(id string) (*model.PluginStatus, *model.Ap
 	return api.app.GetPluginStatus(id)
 }
 
+func (api *PluginAPI) InstallPlugin(file io.Reader, replace bool) (*model.Manifest, *model.AppError) {
+	if !*api.app.Config().PluginSettings.Enable || !*api.app.Config().PluginSettings.EnableUploads {
+		return nil, model.NewAppError("installPlugin", "app.plugin.upload_disabled.app_error", nil, "", http.StatusNotImplemented)
+	}
+
+	fileBuffer, err := ioutil.ReadAll(file)
+	if err != nil {
+		return nil, model.NewAppError("InstallPlugin", "api.plugin.upload.file.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	return api.app.InstallPlugin(bytes.NewReader(fileBuffer), replace)
+}
+
 // KV Store Section
 
 func (api *PluginAPI) KVSet(key string, value []byte) *model.AppError {