feat: support dashboard in homepage (#2207)

* feat: support dashboard

* feat: support dashboard

object/get-dashboard.go

@@ -0,0 +1,111 @@
+// Copyright 2021 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 object
+
+import "time"
+
+type Dashboard struct {
+	OrganizationCounts []int `json:"organizationCounts"`
+	UserCounts         []int `json:"userCounts"`
+	ProviderCounts     []int `json:"providerCounts"`
+	ApplicationCounts  []int `json:"applicationCounts"`
+	SubscriptionCounts []int `json:"subscriptionCounts"`
+}
+
+func GetDashboard() (*Dashboard, error) {
+	dashboard := &Dashboard{
+		OrganizationCounts: make([]int, 31),
+		UserCounts:         make([]int, 31),
+		ProviderCounts:     make([]int, 31),
+		ApplicationCounts:  make([]int, 31),
+		SubscriptionCounts: make([]int, 31),
+	}
+
+	nowTime := time.Now()
+
+	organizations := make([]Organization, 0)
+	if err := ormer.Engine.Find(&organizations); err != nil {
+		return dashboard, err
+	}
+	users := make([]User, 0)
+	if err := ormer.Engine.Find(&users); err != nil {
+		return dashboard, err
+	}
+	providers := make([]Provider, 0)
+	if err := ormer.Engine.Find(&providers); err != nil {
+		return dashboard, err
+	}
+	applications := make([]Application, 0)
+	if err := ormer.Engine.Find(&applications); err != nil {
+		return dashboard, err
+	}
+	subscriptions := make([]Subscription, 0)
+	if err := ormer.Engine.Find(&subscriptions); err != nil {
+		return dashboard, err
+	}
+
+	for i := 30; i >= 0; i-- {
+		cutTime := nowTime.AddDate(0, 0, -i)
+		dashboard.OrganizationCounts[30-i] = countCreatedBefore(organizations, cutTime)
+		dashboard.UserCounts[30-i] = countCreatedBefore(users, cutTime)
+		dashboard.ProviderCounts[30-i] = countCreatedBefore(providers, cutTime)
+		dashboard.ApplicationCounts[30-i] = countCreatedBefore(applications, cutTime)
+		dashboard.SubscriptionCounts[30-i] = countCreatedBefore(subscriptions, cutTime)
+	}
+
+	return dashboard, nil
+}
+
+func countCreatedBefore(objects interface{}, before time.Time) int {
+	count := 0
+	switch obj := objects.(type) {
+	case []Organization:
+		for _, o := range obj {
+			createdTime, _ := time.Parse("2006-01-02T15:04:05-07:00", o.CreatedTime)
+			if createdTime.Before(before) {
+				count++
+			}
+		}
+	case []User:
+		for _, u := range obj {
+			createdTime, _ := time.Parse("2006-01-02T15:04:05-07:00", u.CreatedTime)
+			if createdTime.Before(before) {
+				count++
+			}
+		}
+	case []Provider:
+		for _, p := range obj {
+			createdTime, _ := time.Parse("2006-01-02T15:04:05-07:00", p.CreatedTime)
+			if createdTime.Before(before) {
+				count++
+			}
+		}
+	case []Application:
+		for _, a := range obj {
+			createdTime, _ := time.Parse("2006-01-02T15:04:05-07:00", a.CreatedTime)
+			if createdTime.Before(before) {
+				count++
+			}
+		}
+	case []Subscription:
+		for _, s := range obj {
+			createdTime, _ := time.Parse("2006-01-02T15:04:05-07:00", s.CreatedTime)
+			if createdTime.Before(before) {
+				count++
+			}
+		}
+	}
+	return count
+}