feat: add system info page (#1033)

* feat: add system info page

* feat: add some code

* fix

controllers/system_info.go

@@ -0,0 +1,78 @@
+// Copyright 2022 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package controllers
+
+import (
+	"github.com/casdoor/casdoor/object"
+	"github.com/casdoor/casdoor/util"
+)
+
+type SystemInfo struct {
+	MemoryUsed  uint64    `json:"memory_used"`
+	MemoryTotal uint64    `json:"memory_total"`
+	CpuUsage    []float64 `json:"cpu_usage"`
+}
+
+// GetSystemInfo
+// @Title GetSystemInfo
+// @Tag System API
+// @Description get user's system info
+// @Param   id    query    string  true        "The id of the user"
+// @Success 200 {object} object.SystemInfo The Response object
+// @router /get-system-info [get]
+func (c *ApiController) GetSystemInfo() {
+	id := c.GetString("id")
+	if id == "" {
+		id = c.GetSessionUsername()
+	}
+
+	user := object.GetUser(id)
+	if user == nil || !user.IsGlobalAdmin {
+		c.ResponseError("You are not authorized to access this resource")
+	}
+
+	cpuUsage, err := util.GetCpuUsage()
+	if err != nil {
+		c.ResponseError(err.Error())
+	}
+
+	memoryUsed, memoryTotal, err := util.GetMemoryUsage()
+	if err != nil {
+		c.ResponseError(err.Error())
+	}
+
+	c.Data["json"] = SystemInfo{
+		CpuUsage:    cpuUsage,
+		MemoryUsed:  memoryUsed,
+		MemoryTotal: memoryTotal,
+	}
+	c.ServeJSON()
+}
+
+// GitRepoVersion
+// @Title GitRepoVersion
+// @Tag System API
+// @Description get local github repo's latest release version info
+// @Success 200 {string} local latest version hash of casdoor
+// @router /get-release [get]
+func (c *ApiController) GitRepoVersion() {
+	version, err := util.GetGitRepoVersion()
+	if err != nil {
+		c.ResponseError(err.Error())
+	}
+
+	c.Data["json"] = version
+	c.ServeJSON()
+}