support server plugin feature

models/plugin/server/manager.go

@@ -0,0 +1,105 @@
+// Copyright 2019 fatedier, fatedier@gmail.com
+//
+// 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 plugin
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/fatedier/frp/utils/util"
+	"github.com/fatedier/frp/utils/xlog"
+)
+
+type Manager struct {
+	loginPlugins    []Plugin
+	newProxyPlugins []Plugin
+}
+
+func NewManager() *Manager {
+	return &Manager{
+		loginPlugins:    make([]Plugin, 0),
+		newProxyPlugins: make([]Plugin, 0),
+	}
+}
+
+func (m *Manager) Register(p Plugin) {
+	if p.IsSupport(OpLogin) {
+		m.loginPlugins = append(m.loginPlugins, p)
+	}
+	if p.IsSupport(OpNewProxy) {
+		m.newProxyPlugins = append(m.newProxyPlugins, p)
+	}
+}
+
+func (m *Manager) Login(content *LoginContent) (*LoginContent, error) {
+	var (
+		res = &Response{
+			Reject:   false,
+			Unchange: true,
+		}
+		retContent interface{}
+		err        error
+	)
+	reqid, _ := util.RandId()
+	xl := xlog.New().AppendPrefix("reqid: " + reqid)
+	ctx := xlog.NewContext(context.Background(), xl)
+	ctx = NewReqidContext(ctx, reqid)
+
+	for _, p := range m.loginPlugins {
+		res, retContent, err = p.Handle(ctx, OpLogin, *content)
+		if err != nil {
+			xl.Warn("send Login request to plugin [%s] error: %v", p.Name(), err)
+			return nil, errors.New("send Login request to plugin error")
+		}
+		if res.Reject {
+			return nil, fmt.Errorf("%s", res.RejectReason)
+		}
+		if !res.Unchange {
+			content = retContent.(*LoginContent)
+		}
+	}
+	return content, nil
+}
+
+func (m *Manager) NewProxy(content *NewProxyContent) (*NewProxyContent, error) {
+	var (
+		res = &Response{
+			Reject:   false,
+			Unchange: true,
+		}
+		retContent interface{}
+		err        error
+	)
+	reqid, _ := util.RandId()
+	xl := xlog.New().AppendPrefix("reqid: " + reqid)
+	ctx := xlog.NewContext(context.Background(), xl)
+	ctx = NewReqidContext(ctx, reqid)
+
+	for _, p := range m.newProxyPlugins {
+		res, retContent, err = p.Handle(ctx, OpNewProxy, *content)
+		if err != nil {
+			xl.Warn("send NewProxy request to plugin [%s] error: %v", p.Name(), err)
+			return nil, errors.New("send NewProxy request to plugin error")
+		}
+		if res.Reject {
+			return nil, fmt.Errorf("%s", res.RejectReason)
+		}
+		if !res.Unchange {
+			content = retContent.(*NewProxyContent)
+		}
+	}
+	return content, nil
+}