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|
package main
import (
"encoding/json"
"fmt"
"log"
"net"
)
const (
MESSAGE = "message"
AUTHENTICATE = "authenticate"
RENAME = "rename"
)
const (
SUCCESS = "success"
FAILURE = "failure"
)
type Message struct {
Type string
Data string
User string
}
type Response struct {
Status string
Data string
}
func parseMessage(data []byte) Message {
var m Message
// TODO(andrew): Добавить обработку ошибок
json.Unmarshal(data, &m)
return m
}
func handleConnection(conn net.Conn) {
defer conn.Close()
maxAuthAttempts := 5
authAttempts := 0
authenticated := false
buf := make([]byte, 4096)
for {
if authAttempts >= maxAuthAttempts {
resp, _ := json.Marshal(Response{
Status: FAILURE,
Data: "Превышено количество неавторизованных запросов",
})
_, _ = conn.Write(resp)
break
}
readLen, err := conn.Read(buf)
if err != nil {
break
}
message := parseMessage(buf[:readLen])
if message.Type == AUTHENTICATE {
// TODO(andrew): Добавить процесс аутентификации
if true {
authenticated = true
}
}
if !authenticated {
resp, _ := json.Marshal(Response{
Status: FAILURE,
Data: "Для работы с сервером необходима аутентификация",
})
_, err = conn.Write(resp)
if err != nil {
conn.Close()
break
} else {
authAttempts += 1
continue
}
}
if message.Data == "exit" {
break
}
fmt.Println(message.Data)
resp, _ := json.Marshal(Response{
Status: SUCCESS,
Data: "some data",
})
_, err = conn.Write(resp)
if err != nil {
err = conn.Close()
break
}
}
}
func main() {
sock, err := net.Listen("tcp", "localhost:8080")
handleError(err)
for {
conn, err := sock.Accept()
if err == nil {
go handleConnection(conn)
} else {
break
}
}
}
func handleError(err error) {
if err != nil {
log.Fatal(err)
}
}
|
