Add Link API.

object/application.go

@@ -80,6 +80,22 @@ func getApplication(owner string, name string) *Application {
 	}
 }
 
+func GetDefaultApplication(owner string) *Application {
+	name := "app-built-in"
+	application := Application{Owner: owner, Name: name}
+	existed, err := adapter.engine.Get(&application)
+	if err != nil {
+		panic(err)
+	}
+
+	if existed {
+		extendApplication(&application)
+		return &application
+	} else {
+		return nil
+	}
+}
+
 func getApplicationByClientId(clientId string) *Application {
 	application := Application{}
 	existed, err := adapter.engine.Where("client_id=?", clientId).Get(&application)

object/provider.go

@@ -15,6 +15,8 @@
 package object
 
 import (
+	"strings"
+
 	"github.com/casdoor/casdoor/util"
 	"xorm.io/core"
 )
@@ -41,6 +43,17 @@ func GetProviders(owner string) []*Provider {
 	return providers
 }
 
+func GetDefaultProviders(owner string) []*Provider {
+	providers := GetProviders(owner)
+	res := []*Provider{}
+	for _, provider := range providers {
+		if strings.Contains(provider.Name, "casdoor") {
+			res = append(res, provider)
+		}
+	}
+	return res
+}
+
 func getProvider(owner string, name string) *Provider {
 	provider := Provider{Owner: owner, Name: name}
 	existed, err := adapter.engine.Get(&provider)