From 3328c46ecfa7772b5a44e421a16b715761e7a3d4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=A0=D1=83=D1=81=D0=BB=D0=B0=D0=BD?= <im@fruw.org>
Date: Sun, 1 Oct 2023 02:11:13 +0600
Subject: [PATCH] Create main.go

---
 main.go | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 main.go

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..52e2a86
--- /dev/null
+++ b/main.go
@@ -0,0 +1,81 @@
+package main
+
+import (
+        "fmt"
+        "io/ioutil"
+        "net/http"
+        "os/exec"
+        "regexp"
+)
+
+func getIP(w http.ResponseWriter, r *http.Request) {
+        ip := r.Header.Get("X-Real-IP")
+        if ip == "" {
+                ip = r.RemoteAddr
+        }
+
+        err := addToWhiteList(ip)
+        if err != nil {
+                fmt.Println("Error:", err)
+                // Handle the error response as needed.
+                http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+                return
+        }
+}
+
+func addToWhiteList(newIPAddress string) error {
+        serviceFilePath := "/etc/systemd/system/caddy.service"
+
+        content, err := ioutil.ReadFile(serviceFilePath)
+        if err != nil {
+                fmt.Println("Error reading file:", err)
+                return err
+        }
+
+        originalString := string(content)
+
+        re := regexp.MustCompile(`(WHITE_LIST=)([^"\s]+)`)
+
+        match := re.FindString(originalString)
+
+        if match != "" {
+                existingWhiteList := re.FindStringSubmatch(originalString)[2]
+
+                newWhiteList := existingWhiteList + " " + newIPAddress
+
+                updatedString := re.ReplaceAllString(originalString, "${1}"+newWhiteList)
+
+                err = ioutil.WriteFile(serviceFilePath, []byte(updatedString), 0644)
+                if err != nil {
+                        fmt.Println("Error writing file:", err)
+                        return err
+                }
+
+                if err := exec.Command("systemctl", "daemon-reload").Run(); err != nil {
+                        return err
+                }
+
+                if err := exec.Command("systemctl", "restart", "caddy.service").Run(); err != nil {
+                        return err
+                }
+
+                fmt.Println("IP successfully bleached - ", newIPAddress)
+
+                return nil
+        } else {
+                fmt.Println("WHITE_LIST not found.")
+                return nil
+        }
+}
+
+func main() {
+        http.HandleFunc("/", getIP)
+
+        port := 50009
+        fmt.Printf("Server is running on port %d...\n", port)
+
+        err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
+        if err != nil {
+                fmt.Println("Error starting server:", err)
+        }
+}