Add acl (#61)

* update

* update auth file

plugins/auth/authfile/aclconfig.go

@@ -0,0 +1,114 @@
+package acl
+
+import (
+	"bufio"
+	"errors"
+	"io"
+	"os"
+	"strings"
+)
+
+const (
+	SUB      = "1"
+	PUB      = "2"
+	PUBSUB   = "3"
+	CLIENTID = "clientid"
+	USERNAME = "username"
+	IP       = "ip"
+	ALLOW    = "allow"
+	DENY     = "deny"
+)
+
+type AuthInfo struct {
+	Auth   string
+	Typ    string
+	Val    string
+	PubSub string
+	Topics []string
+}
+
+type ACLConfig struct {
+	File string
+	Info []*AuthInfo
+}
+
+func AclConfigLoad(file string) (*ACLConfig, error) {
+	aclconifg := &ACLConfig{
+		File: file,
+		Info: make([]*AuthInfo, 0, 4),
+	}
+	err := aclconifg.Prase()
+	if err != nil {
+		return nil, err
+	}
+	return aclconifg, err
+}
+
+func (c *ACLConfig) Prase() error {
+	f, err := os.Open(c.File)
+	defer f.Close()
+	if err != nil {
+		return err
+	}
+	buf := bufio.NewReader(f)
+	var parseErr error
+	for {
+		line, err := buf.ReadString('\n')
+		line = strings.TrimSpace(line)
+		if isCommentOut(line) {
+			continue
+		}
+		if line == "" {
+			return parseErr
+		}
+		// fmt.Println(line)
+		tmpArr := strings.Fields(line)
+		if len(tmpArr) != 5 {
+			parseErr = errors.New("\"" + line + "\" format is error")
+			break
+		}
+		if tmpArr[0] != ALLOW && tmpArr[0] != DENY {
+			parseErr = errors.New("\"" + line + "\" format is error")
+			break
+		}
+		if tmpArr[1] != CLIENTID && tmpArr[1] != USERNAME && tmpArr[1] != IP {
+			parseErr = errors.New("\"" + line + "\" format is error")
+			break
+		}
+		if tmpArr[3] != PUB && tmpArr[3] != SUB && tmpArr[3] != PUBSUB {
+			parseErr = errors.New("\"" + line + "\" format is error")
+			break
+		}
+		// var pubsub int
+		// pubsub, err = strconv.Atoi(tmpArr[3])
+		// if err != nil {
+		// 	parseErr = errors.New("\"" + line + "\" format is error")
+		// 	break
+		// }
+		topicStr := strings.Replace(tmpArr[4], " ", "", -1)
+		topicStr = strings.Replace(topicStr, "\n", "", -1)
+		topics := strings.Split(topicStr, ",")
+		tmpAuth := &AuthInfo{
+			Auth:   tmpArr[0],
+			Typ:    tmpArr[1],
+			Val:    tmpArr[2],
+			Topics: topics,
+			PubSub: tmpArr[3],
+		}
+		c.Info = append(c.Info, tmpAuth)
+		if err != nil {
+			if err != io.EOF {
+				parseErr = err
+			}
+			break
+		}
+	}
+	return parseErr
+}
+func isCommentOut(line string) bool {
+	if strings.HasPrefix(line, "#") || strings.HasPrefix(line, ";") || strings.HasPrefix(line, "//") || strings.HasPrefix(line, "*") {
+		return true
+	} else {
+		return false
+	}
+}