Add Link API.

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)