Optimized UX and code structure

+ Added automatic self-sign certificate sniffing
+ Moved all constant into def.go
+ Added auto restart on port change when proxy server is running
+ Optimized slow search geoIP resolver by introducing new cache mechanism
+ Updated default incoming port to HTTPS instead of HTTP

src/mod/dynamicproxy/access.go

@@ -1,7 +1,6 @@
 package dynamicproxy
 
 import (
-	"log"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -16,7 +15,7 @@ func (h *ProxyHandler) handleAccessRouting(ruleID string, w http.ResponseWriter,
 	accessRule, err := h.Parent.Option.AccessController.GetAccessRuleByID(ruleID)
 	if err != nil {
 		//Unable to load access rule. Target rule not found?
-		log.Println("[Proxy] Unable to load access rule: " + ruleID)
+		h.Parent.Option.Logger.PrintAndLog("proxy-access", "Unable to load access rule: "+ruleID, err)
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte("500 - Internal Server Error"))
 		return true

src/mod/dynamicproxy/domainsniff/domainsniff.go

@@ -10,8 +10,14 @@ package domainsniff
 */
 import (
 	"crypto/tls"
+	"encoding/json"
+	"fmt"
 	"net"
+	"net/http"
+	"strings"
 	"time"
+
+	"imuslab.com/zoraxy/mod/utils"
 )
 
 // Check if the domain is reachable and return err if not reachable
@@ -27,30 +33,114 @@ func DomainReachableWithError(domain string) error {
 }
 
 // Check if a domain have TLS but it is self-signed or expired
-func DomainIsSelfSigned(domain string) (bool, error) {
+// Return false if sniff error
+func DomainIsSelfSigned(domain string) bool {
+	//Extract the domain from URl in case the user input the full URL
+	host, port, err := net.SplitHostPort(domain)
+	if err != nil {
+		host = domain
+	} else {
+		domain = host + ":" + port
+	}
+	if !strings.Contains(domain, ":") {
+		domain = domain + ":443"
+	}
+
 	//Get the certificate
 	conn, err := net.Dial("tcp", domain)
 	if err != nil {
-		return false, err
+		return false
 	}
 	defer conn.Close()
 
+	//Connect with TLS using secure verify
+	tlsConn := tls.Client(conn, nil)
+	err = tlsConn.Handshake()
+	if err == nil {
+		//This is a valid certificate
+		fmt.Println()
+		return false
+	}
+
 	//Connect with TLS using insecure skip verify
 	config := &tls.Config{
 		InsecureSkipVerify: true,
 	}
-	tlsConn := tls.Client(conn, config)
+	tlsConn = tls.Client(conn, config)
 	err = tlsConn.Handshake()
-	if err != nil {
-		return false, err
-	}
-
-	//Check if the certificate is self-signed
-	cert := tlsConn.ConnectionState().PeerCertificates[0]
-	return cert.Issuer.CommonName == cert.Subject.CommonName, nil
+	//If the handshake is successful, this is a self-signed certificate
+	return err == nil
 }
 
 // Check if domain reachable
 func DomainReachable(domain string) bool {
 	return DomainReachableWithError(domain) == nil
 }
+
+// Check if domain is served by a web server using HTTPS
+func DomainUsesTLS(targetURL string) bool {
+	//Check if the site support https
+	httpsUrl := fmt.Sprintf("https://%s", targetURL)
+	httpUrl := fmt.Sprintf("http://%s", targetURL)
+
+	client := http.Client{Timeout: 5 * time.Second}
+
+	resp, err := client.Head(httpsUrl)
+	if err == nil && resp.StatusCode == http.StatusOK {
+		return true
+	}
+
+	resp, err = client.Head(httpUrl)
+	if err == nil && resp.StatusCode == http.StatusOK {
+		return false
+	}
+
+	//If the site is not reachable, return false
+	return false
+}
+
+/*
+	Request Handlers
+*/
+//Check if site support TLS
+//Pass in ?selfsignchk=true to also check for self-signed certificate
+func HandleCheckSiteSupportTLS(w http.ResponseWriter, r *http.Request) {
+	targetURL, err := utils.PostPara(r, "url")
+	if err != nil {
+		utils.SendErrorResponse(w, "invalid url given")
+		return
+	}
+
+	//If the selfsign flag is set, also chec for self-signed certificate
+	_, err = utils.PostBool(r, "selfsignchk")
+	if err == nil {
+		//Return the https and selfsign status
+		type result struct {
+			Protocol string `json:"protocol"`
+			SelfSign bool   `json:"selfsign"`
+		}
+
+		scanResult := result{Protocol: "http", SelfSign: false}
+
+		if DomainUsesTLS(targetURL) {
+			scanResult.Protocol = "https"
+			if DomainIsSelfSigned(targetURL) {
+				scanResult.SelfSign = true
+			}
+		}
+
+		js, _ := json.Marshal(scanResult)
+		utils.SendJSONResponse(w, string(js))
+		return
+	}
+
+	if DomainUsesTLS(targetURL) {
+		js, _ := json.Marshal("https")
+		utils.SendJSONResponse(w, string(js))
+		return
+	} else {
+		js, _ := json.Marshal("http")
+		utils.SendJSONResponse(w, string(js))
+		return
+	}
+}

src/mod/dynamicproxy/dynamicproxy.go

@@ -291,7 +291,7 @@ func (router *Router) Restart() error {
 			return err
 		}
 
-		time.Sleep(300 * time.Millisecond)
+		time.Sleep(800 * time.Millisecond)
 		// Start the server
 		err = router.StartProxyService()
 		if err != nil {