Merge pull request #162 from wdvxdr1123/master

反向WS添加事件过滤器

global/filter.go

+package global
+
+import (
+	log "github.com/sirupsen/logrus"
+	"github.com/tidwall/gjson"
+	"io/ioutil"
+	"regexp"
+	"strings"
+	"sync"
+)
+
+type Filter interface {
+	Eval(payload gjson.Result) bool
+}
+
+type OperationNode struct {
+	key string
+	filter Filter
+}
+
+type NotOperator struct {
+	operand_ Filter
+}
+
+func notOperatorConstruct(argument gjson.Result) *NotOperator {
+	if !argument.IsObject() {
+		log.Error("the argument of 'not' operator must be an object")
+	}
+	op := new(NotOperator)
+	op.operand_ = GetOperatorFactory().Generate("and", argument)
+	return op
+}
+
+func (notOperator NotOperator) Eval(payload gjson.Result) bool {
+	log.Debug("not " + payload.Str)
+	return !(notOperator.operand_).Eval(payload)
+}
+
+type AndOperator struct {
+	operands []OperationNode
+}
+
+func andOperatorConstruct(argument gjson.Result) *AndOperator {
+	if !argument.IsObject() {
+		log.Error("the argument of 'and' operator must be an object")
+	}
+	op := new(AndOperator)
+	argument.ForEach(func(key, value gjson.Result) bool {
+		if key.Str[0] == '.' {
+			// is an operator
+			//   ".foo": {
+			//       "bar": "baz"
+			//   }
+			opKey := key.Str[1:]
+			op.operands = append(op.operands, OperationNode{"", GetOperatorFactory().Generate(opKey, value)})
+		} else if value.IsObject() {
+			// is an normal key with an object as the value
+			//   "foo": {
+			//       ".bar": "baz"
+			//   }
+			opKey := key.Str
+			op.operands = append(op.operands, OperationNode{opKey, GetOperatorFactory().Generate("and", value)})
+		} else {
+			// is an normal key with a non-object as the value
+			//   "foo": "bar"
+			opKey := key.Str
+			op.operands = append(op.operands, OperationNode{opKey, GetOperatorFactory().Generate("eq", value)})
+		}
+		return true
+	})
+	return op
+}
+
+func (andOperator *AndOperator) Eval(payload gjson.Result) bool {
+	log.Debug("and " + payload.Str)
+	res := true
+	for _, operand := range andOperator.operands {
+
+		if len(operand.key) == 0 {
+			// is an operator
+			res = res && operand.filter.Eval(payload)
+		} else {
+			// is an normal key
+			val := payload.Get(operand.key)
+			res = res && operand.filter.Eval(val)
+		}
+
+		if res == false {
+			break
+		}
+	}
+	return res
+}
+
+type OrOperator struct {
+	operands []Filter
+}
+
+func orOperatorConstruct(argument gjson.Result) *OrOperator {
+	if !argument.IsArray() {
+		log.Error("the argument of 'or' operator must be an array")
+	}
+	op := new(OrOperator)
+	argument.ForEach(func(_, value gjson.Result) bool {
+		op.operands = append(op.operands, GetOperatorFactory().Generate("and", value))
+		return true
+	})
+	return op
+}
+
+func (orOperator OrOperator) Eval(payload gjson.Result) bool {
+	log.Debug("or "+ payload.Str)
+	res:= false
+	for _, operand := range orOperator.operands {
+		res = res || operand.Eval(payload)
+
+		if res == true {
+			break
+		}
+	}
+	return res
+}
+
+type EqualOperator struct {
+	value gjson.Result
+}
+
+func equalOperatorConstruct(argument gjson.Result) *EqualOperator {
+	op := new(EqualOperator)
+	op.value = argument
+	return op
+}
+
+func (equalOperator EqualOperator) Eval(payload gjson.Result) bool {
+	log.Debug("eq "+ payload.Str + "==" + equalOperator.value.Str)
+	return payload.Str == equalOperator.value.Str
+}
+
+type NotEqualOperator struct {
+	value gjson.Result
+}
+
+func notEqualOperatorConstruct(argument gjson.Result) *NotEqualOperator {
+	op := new(NotEqualOperator)
+	op.value = argument
+	return op
+}
+
+func (notEqualOperator NotEqualOperator) Eval(payload gjson.Result) bool {
+	log.Debug("neq " + payload.Str)
+	return !(payload.Str == notEqualOperator.value.Str)
+}
+
+
+type InOperator struct {
+	operand gjson.Result
+}
+
+func inOperatorConstruct(argument gjson.Result) *InOperator {
+	if argument.IsObject() {
+		log.Error("the argument of 'in' operator must be an array or a string")
+	}
+	op := new(InOperator)
+	op.operand = argument
+	return op
+}
+
+func (inOperator InOperator) Eval(payload gjson.Result) bool {
+	log.Debug("in " + payload.Str)
+	if inOperator.operand.IsArray() {
+		res := false
+		inOperator.operand.ForEach(func(key, value gjson.Result) bool {
+			res = res || value.Str == payload.Str
+			return true
+		})
+		return res
+	}
+	return strings.Contains(inOperator.operand.Str, payload.Str)
+}
+
+type ContainsOperator struct {
+	operand string
+}
+
+func containsOperatorConstruct(argument gjson.Result) *ContainsOperator {
+	if argument.IsArray() || argument.IsObject() {
+		log.Error("the argument of 'contains' operator must be a string")
+	}
+	op := new(ContainsOperator)
+	op.operand = argument.Str
+	return op
+}
+
+func (containsOperator ContainsOperator) Eval(payload gjson.Result) bool {
+	log.Debug("contains "+ payload.Str)
+	if payload.IsObject() || payload.IsArray() {
+		return false
+	}
+	return strings.Contains(payload.String(), containsOperator.operand)
+}
+
+type RegexOperator struct {
+	regex string
+}
+
+func regexOperatorConstruct(argument gjson.Result) *RegexOperator {
+	if argument.IsArray() || argument.IsObject() {
+		log.Error("the argument of 'regex' operator must be a string")
+	}
+	op := new(RegexOperator)
+	op.regex = argument.Str
+	return op
+}
+
+func (containsOperator RegexOperator) Eval(payload gjson.Result) bool {
+	log.Debug("regex " + payload.Str)
+	matched, _ := regexp.MatchString(containsOperator.regex, payload.Str)
+	return matched
+}
+// 单例工厂
+type operatorFactory struct{
+}
+
+var instance *operatorFactory = &operatorFactory{}
+
+func GetOperatorFactory() *operatorFactory {
+	return instance
+}
+
+func (o operatorFactory) Generate(opName string, argument gjson.Result) Filter {
+	switch opName {
+	case "not":
+		return notOperatorConstruct(argument)
+	case "and":
+		return andOperatorConstruct(argument)
+	case "or":
+		return orOperatorConstruct(argument)
+	case "neq":
+		return notEqualOperatorConstruct(argument)
+	case "eq":
+		return equalOperatorConstruct(argument)
+	case "in":
+		return inOperatorConstruct(argument)
+	case "contains":
+		return containsOperatorConstruct(argument)
+	case "regex":
+		return regexOperatorConstruct(argument)
+	default:
+		log.Warnf("the operator '%s' is not supported", opName)
+		return nil
+	}
+}
+
+var filter = new(Filter)
+var once sync.Once   // 过滤器单例模式
+
+func GetFilter() *Filter {
+	once.Do(func() {
+		f, err := ioutil.ReadFile("filter.json")
+		if err != nil {
+			filter = nil
+		} else {
+			*filter = GetOperatorFactory().Generate("and", gjson.ParseBytes(f))
+		}
+	})
+	return filter
+}
\ No newline at end of file

server/websocket.go

@@ -172,6 +172,12 @@ func (c *websocketClient) listenApi(conn *websocketConn, u bool) {
 }
 
 func (c *websocketClient) onBotPushEvent(m coolq.MSG) {
+	payload := gjson.Parse(m.ToJson())
+	filter := global.GetFilter()
+	if filter != nil && (*filter).Eval(payload) == false {
+		log.Debug("Event filtered!")
+		return
+	}
 	if c.eventConn != nil {
 		log.Debugf("向WS服务器 %v 推送Event: %v", c.eventConn.RemoteAddr().String(), m.ToJson())
 		c.eventConn.Lock()