Squashed 'livekit-server/' content from commit 154b4d26

git-subtree-dir: livekit-server
git-subtree-split: 154b4d26b769c68a03c096124094b97bf61a996f

pkg/clientconfiguration/match.go

@@ -0,0 +1,92 @@
+// Copyright 2023 LiveKit, Inc.
+//
+// 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 clientconfiguration
+
+import (
+	"context"
+	"errors"
+	"strings"
+
+	"github.com/d5/tengo/v2"
+
+	"github.com/livekit/protocol/livekit"
+)
+
+type Match interface {
+	Match(clientInfo *livekit.ClientInfo) (bool, error)
+}
+
+type ScriptMatch struct {
+	Expr string
+}
+
+// use result of eval script expression for match.
+// expression examples:
+// protocol bigger than 5 : c.protocol > 5
+// browser if firefox: c.browser == "firefox"
+// combined rule : c.protocol > 5 && c.browser == "firefox"
+func (m *ScriptMatch) Match(clientInfo *livekit.ClientInfo) (bool, error) {
+	res, err := tengo.Eval(context.TODO(), m.Expr, map[string]interface{}{"c": &clientObject{info: clientInfo}})
+	if err != nil {
+		return false, err
+	}
+
+	if val, ok := res.(bool); ok {
+		return val, nil
+	}
+	return false, errors.New("invalid match expression result")
+}
+
+type clientObject struct {
+	tengo.ObjectImpl
+	info *livekit.ClientInfo
+}
+
+func (c *clientObject) TypeName() string {
+	return "clientObject"
+}
+
+func (c *clientObject) String() string {
+	return c.info.String()
+}
+
+func (c *clientObject) IndexGet(index tengo.Object) (res tengo.Object, err error) {
+	field, ok := index.(*tengo.String)
+	if !ok {
+		return nil, tengo.ErrInvalidIndexType
+	}
+
+	switch field.Value {
+	case "sdk":
+		return &tengo.String{Value: strings.ToLower(c.info.Sdk.String())}, nil
+	case "version":
+		return &tengo.String{Value: c.info.Version}, nil
+	case "protocol":
+		return &tengo.Int{Value: int64(c.info.Protocol)}, nil
+	case "os":
+		return &tengo.String{Value: strings.ToLower(c.info.Os)}, nil
+	case "os_version":
+		return &tengo.String{Value: c.info.OsVersion}, nil
+	case "device_model":
+		return &tengo.String{Value: strings.ToLower(c.info.DeviceModel)}, nil
+	case "browser":
+		return &tengo.String{Value: strings.ToLower(c.info.Browser)}, nil
+	case "browser_version":
+		return &tengo.String{Value: c.info.BrowserVersion}, nil
+	case "address":
+		return &tengo.String{Value: c.info.Address}, nil
+	}
+	return &tengo.Undefined{}, nil
+}