1.4.5.2

EdgeCommon/pkg/serverconfigs/user_agent_config.go

@@ -0,0 +1,161 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package serverconfigs
+
+import (
+	"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs/shared"
+	"net/http"
+	"regexp"
+	"strings"
+)
+
+type UserAgentAction = string
+
+const (
+	UserAgentActionAllow UserAgentAction = "allow"
+	UserAgentActionDeny  UserAgentAction = "deny"
+)
+
+type UserAgentKeyword struct {
+	keyword string
+	reg     *regexp.Regexp
+}
+
+func NewUserAgentKeyword(keyword string) *UserAgentKeyword {
+	var reg *regexp.Regexp
+	if strings.Contains(keyword, "*") {
+		var pieces = strings.Split(keyword, "*")
+		for index, piece := range pieces {
+			pieces[index] = regexp.QuoteMeta(piece)
+		}
+		var newKeyword = strings.Join(pieces, ".*")
+		r, _ := regexp.Compile("(?i)" + newKeyword)
+		reg = r
+	} else {
+		r, _ := regexp.Compile("(?i)" + regexp.QuoteMeta(keyword))
+		reg = r
+	}
+
+	return &UserAgentKeyword{
+		keyword: keyword,
+		reg:     reg,
+	}
+}
+
+type UserAgentFilter struct {
+	Keywords []string        `yaml:"keywords" json:"keywords"` // 关键词
+	Action   UserAgentAction `yaml:"action" json:"action"`     // 动作
+
+	keywords []*UserAgentKeyword
+}
+
+func (this *UserAgentFilter) Init() error {
+	this.keywords = []*UserAgentKeyword{}
+	for _, keyword := range this.Keywords {
+		this.keywords = append(this.keywords, NewUserAgentKeyword(keyword))
+	}
+
+	return nil
+}
+
+func (this *UserAgentFilter) Match(userAgent string) bool {
+	if len(this.Keywords) == 0 {
+		return false
+	}
+
+	for _, keyword := range this.keywords {
+		if len(keyword.keyword) == 0 {
+			// 空白
+			if len(userAgent) == 0 {
+				return true
+			}
+		} else if keyword.reg != nil {
+			if keyword.reg.MatchString(userAgent) {
+				return true
+			}
+		} else if strings.Contains(userAgent, keyword.keyword) {
+			return true
+		}
+	}
+
+	return false
+}
+
+type UserAgentConfig struct {
+	IsPrior bool               `yaml:"isPrior" json:"isPrior"`
+	IsOn    bool               `yaml:"isOn" json:"isOn"`
+	Filters []*UserAgentFilter `yaml:"filters" json:"filters"`
+
+	OnlyURLPatterns   []*shared.URLPattern `yaml:"onlyURLPatterns" json:"onlyURLPatterns"`     // 仅限的URL
+	ExceptURLPatterns []*shared.URLPattern `yaml:"exceptURLPatterns" json:"exceptURLPatterns"` // 排除的URL
+}
+
+func NewUserAgentConfig() *UserAgentConfig {
+	return &UserAgentConfig{}
+}
+
+func (this *UserAgentConfig) Init() error {
+	// filters
+	for _, filter := range this.Filters {
+		err := filter.Init()
+		if err != nil {
+			return err
+		}
+	}
+
+	// url patterns
+	for _, pattern := range this.ExceptURLPatterns {
+		err := pattern.Init()
+		if err != nil {
+			return err
+		}
+	}
+
+	for _, pattern := range this.OnlyURLPatterns {
+		err := pattern.Init()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (this *UserAgentConfig) AllowRequest(req *http.Request) bool {
+	if len(this.Filters) == 0 {
+		return true
+	}
+
+	var userAgent = req.UserAgent()
+
+	for _, filter := range this.Filters {
+		if filter.Match(userAgent) {
+			return filter.Action == UserAgentActionAllow
+		}
+	}
+
+	return true
+}
+
+func (this *UserAgentConfig) MatchURL(url string) bool {
+	// except
+	if len(this.ExceptURLPatterns) > 0 {
+		for _, pattern := range this.ExceptURLPatterns {
+			if pattern.Match(url) {
+				return false
+			}
+		}
+	}
+
+	// only
+	if len(this.OnlyURLPatterns) > 0 {
+		for _, pattern := range this.OnlyURLPatterns {
+			if pattern.Match(url) {
+				return true
+			}
+		}
+		return false
+	}
+
+	return true
+}