Merge branch 'master' of https://github.com/shlldev/miniws

main.go

@@ -1,10 +1,12 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"log"
 	"net/http"
 	"os"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -13,39 +15,65 @@ import (
 )
 
 const (
-	PATH_ACCESSLOG string      = "access.log"
+	PATH_ACCESSLOG        string      = "access.log"
-	PATH_ERRORLOG  string      = "error.log"
+	PATH_ERRORLOG         string      = "error.log"
-	FLAGS_LOG_OPEN int         = os.O_APPEND | os.O_WRONLY | os.O_CREATE
+	PATH_IPFILTER         string      = "ipfilter.conf"
-	PERMS_LOG_OPEN os.FileMode = os.ModeType | os.ModePerm
+	PATH_USERAGENTFILTER  string      = "useragentfilter.conf"
+	FLAGS_LOG_OPEN        int         = os.O_APPEND | os.O_WRONLY | os.O_CREATE
+	FLAGS_CONFIG_OPEN     int         = os.O_RDONLY | os.O_CREATE
+	PERMS_LOG_OPEN        os.FileMode = os.ModeType | os.ModePerm
+	PERMS_CONFIG_OPEN     os.FileMode = os.ModeType | os.ModePerm
+	PERMS_MKDIR           os.FileMode = os.ModeDir | os.ModePerm
+	FILTER_MODE_WHITELIST             = 0
+	FILTER_MODE_BLACKLIST             = 1
 )
 
-var _logFolder string = ""
+var (
+	logFolder           string   = ""
+	configFolder        string   = ""
+	ipFilter            []string = make([]string, 0)
+	ipFilterMode                 = FILTER_MODE_WHITELIST
+	userAgentFilter     []string = make([]string, 0)
+	userAgentFilterMode          = FILTER_MODE_WHITELIST
+)
 
 func main() {
 
 	parser := argparse.NewParser("miniws", "")
 	port := parser.String("p", "port", &argparse.Options{Default: "8040"})
-	logFolder := parser.String("l", "logs-folder", &argparse.Options{Default: "logs"})
+	_logFolder := parser.String("l", "logs-folder", &argparse.Options{Default: "logs"})
+	_configFolder := parser.String("c", "config-folder", &argparse.Options{Default: "config"})
 
 	err := parser.Parse(os.Args)
 	if err != nil {
 		// In case of error print error and print usage
 		// This can also be done by passing -h or --help flags
 		fmt.Print(parser.Usage(err))
+		return
 	}
 
-	_logFolder = *logFolder
+	logFolder = *_logFolder
+	configFolder = *_configFolder
 
-	http.HandleFunc("/{resource...}", get)
+	parseIpFilter()
+	parseUserAgentFilter()
+	http.HandleFunc("/", get)
 	log.Println("Server started on port " + *port)
 	http.ListenAndServe(":"+*port, nil)
 }
 
 func get(writer http.ResponseWriter, req *http.Request) {
+
+	respStatusCode := http.StatusOK
+
+	if !isIpValid(req.RemoteAddr) || !isUserAgentValid(req.UserAgent()) {
+		writer.WriteHeader(http.StatusForbidden)
+		return
+	}
+
 	fetchedData, fetchErr := fetchFileContents(req.URL.Path)
 
 	sentBytes := 0
-	respStatusCode := http.StatusOK
 
 	if logIfError(fetchErr) {
 		respStatusCode = http.StatusNotFound
@@ -102,22 +130,22 @@ func logAccess(
 	out := fmt.Sprintf("%v %v %v [%v] \"%v\" %v %v \"%v\" \"%v\"\n",
 		remoteAddr, identifier, authuser, timestamp, request, status, bytesSent, referer, user_agent,
 	)
-	os.Mkdir(_logFolder, os.ModeDir|os.ModePerm)
+	os.Mkdir(logFolder, os.ModeDir|os.ModePerm)
-	file, err := os.OpenFile(ensureSlashSuffix(_logFolder)+PATH_ACCESSLOG, FLAGS_LOG_OPEN, PERMS_LOG_OPEN)
+	file, err := os.OpenFile(ensureSlashSuffix(logFolder)+PATH_ACCESSLOG, FLAGS_LOG_OPEN, PERMS_LOG_OPEN)
 
 	if err != nil {
-		log.Println("couldn't open log access file at", ensureSlashSuffix(_logFolder)+PATH_ACCESSLOG)
+		log.Println("couldn't open log access file at", ensureSlashSuffix(logFolder)+PATH_ACCESSLOG)
 	}
 	defer file.Close()
 	file.WriteString(out)
 }
 
 func logError(str string) {
-	os.Mkdir(_logFolder, os.ModeDir|os.ModePerm)
+	os.Mkdir(logFolder, PERMS_MKDIR)
-	file, err := os.OpenFile(ensureSlashSuffix(_logFolder)+PATH_ERRORLOG, FLAGS_LOG_OPEN, PERMS_LOG_OPEN)
+	file, err := os.OpenFile(ensureSlashSuffix(logFolder)+PATH_ERRORLOG, FLAGS_LOG_OPEN, PERMS_LOG_OPEN)
 
 	if err != nil {
-		log.Println("couldn't open log error file at", ensureSlashSuffix(_logFolder)+PATH_ERRORLOG)
+		log.Println("couldn't open log error file at", ensureSlashSuffix(logFolder)+PATH_ERRORLOG)
 	}
 	defer file.Close()
 	file.WriteString(str + "\n")
@@ -137,3 +165,94 @@ func getOrDash(str string) string {
 func ensureSlashSuffix(str string) string {
 	return strings.TrimSuffix(str, "/") + "/"
 }
+
+func isIpValid(ip string) bool {
+	ip = strings.Split(ip, ":")[0] // remove port
+	switch ipFilterMode {
+	case FILTER_MODE_WHITELIST:
+		return slices.Contains(ipFilter, ip)
+	case FILTER_MODE_BLACKLIST:
+		return !slices.Contains(ipFilter, ip)
+	default:
+		return false
+	}
+}
+
+func isUserAgentValid(userAgent string) bool {
+	switch userAgentFilterMode {
+	case FILTER_MODE_WHITELIST:
+		return slices.Contains(userAgentFilter, userAgent)
+	case FILTER_MODE_BLACKLIST:
+		return !slices.Contains(userAgentFilter, userAgent)
+	default:
+		return false
+	}
+}
+
+func parseIpFilter() {
+	os.Mkdir(configFolder, PERMS_MKDIR)
+	fileinfo, err := os.Stat(ensureSlashSuffix(configFolder) + PATH_IPFILTER)
+
+	if errors.Is(err, os.ErrNotExist) {
+		os.Create(ensureSlashSuffix(configFolder) + PATH_IPFILTER)
+	}
+	if fileinfo.Size() == 0 { // empty config
+		ipFilterMode = FILTER_MODE_BLACKLIST
+		ipFilter = make([]string, 0)
+		return
+	}
+	ipFilterContent, err := os.ReadFile(ensureSlashSuffix(configFolder) + PATH_IPFILTER)
+
+	if logIfError(err) {
+		return
+	}
+
+	ipFilterLines := strings.Split(string(ipFilterContent), "\n")
+
+	_ipFilterMode := ipFilterLines[0]
+
+	switch _ipFilterMode {
+	case "allow":
+		ipFilterMode = FILTER_MODE_WHITELIST
+	case "deny":
+		ipFilterMode = FILTER_MODE_BLACKLIST
+	default:
+		logError("invalid ip filter mode, use allow|deny")
+	}
+
+	ipFilter = ipFilterLines[1:]
+
+}
+
+func parseUserAgentFilter() {
+	os.Mkdir(configFolder, PERMS_MKDIR)
+	fileinfo, err := os.Stat(ensureSlashSuffix(configFolder) + PATH_USERAGENTFILTER)
+	if errors.Is(err, os.ErrNotExist) {
+		os.Create(ensureSlashSuffix(configFolder) + PATH_USERAGENTFILTER)
+	}
+	if fileinfo.Size() == 0 { // empty config
+		userAgentFilterMode = FILTER_MODE_BLACKLIST
+		userAgentFilter = make([]string, 0)
+		return
+	}
+
+	userAgentFilterContent, err := os.ReadFile(ensureSlashSuffix(configFolder) + PATH_USERAGENTFILTER)
+
+	if logIfError(err) {
+		return
+	}
+
+	userAgentFilterLines := strings.Split(string(userAgentFilterContent), "\n")
+	_userAgentFilterMode := userAgentFilterLines[0]
+
+	println(len(userAgentFilterLines))
+	switch _userAgentFilterMode {
+	case "allow":
+		userAgentFilterMode = FILTER_MODE_WHITELIST
+	case "deny":
+		userAgentFilterMode = FILTER_MODE_BLACKLIST
+	default:
+		logError("invalid userAgent filter mode, use allow|deny")
+	}
+	userAgentFilter = userAgentFilterLines[1:]
+}