Create Entry Point

Entry Point

@@ -0,0 +1,86 @@
+package main
+
+import (
+    "log"
+    "net/http"
+    "net/http/httputil"
+    "net/url"
+)
+
+type Config struct {
+    ListenAddr     string
+    TargetURL      string
+    AuthServiceURL string
+}
+
+type EntryPoint struct {
+    config     *Config
+    proxy      *httputil.ReverseProxy
+    authClient *http.Client
+}
+
+func NewEntryPoint(config *Config) (*EntryPoint, error) {
+    targetURL, err := url.Parse(config.TargetURL)
+    if err != nil {
+        return nil, err
+    }
+
+    return &EntryPoint{
+        config:     config,
+        proxy:      httputil.NewSingleHostReverseProxy(targetURL),
+        authClient: &http.Client{},
+    }, nil
+}
+
+func (ep *EntryPoint) verifyAuth(token string) (bool, error) {
+    req, err := http.NewRequest("POST", ep.config.AuthServiceURL, nil)
+    if err != nil {
+        return false, err
+    }
+
+    req.Header.Set("Authorization", token)
+    resp, err := ep.authClient.Do(req)
+    if err != nil {
+        return false, err
+    }
+    defer resp.Body.Close()
+
+    return resp.StatusCode == http.StatusOK, nil
+}
+
+func (ep *EntryPoint) ProxyHandler(w http.ResponseWriter, r *http.Request) {
+
+    token := r.Header.Get("Authorization")
+
+
+    authorized, err := ep.verifyAuth(token)
+    if err != nil {
+        http.Error(w, "Authorization service error", http.StatusInternalServerError)
+        return
+    }
+
+    if !authorized {
+        http.Error(w, "Unauthorized", http.StatusUnauthorized)
+        return
+    }
+
+
+    ep.proxy.ServeHTTP(w, r)
+}
+
+func main() {
+    config := &Config{
+        ListenAddr:     ":8080",
+        TargetURL:      "http://target-service:8000",
+        AuthServiceURL: "http://auth-service:8001/verify",
+    }
+
+    entryPoint, err := NewEntryPoint(config)
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    http.HandleFunc("/", entryPoint.ProxyHandler)
+    log.Printf("Starting entry point on %s", config.ListenAddr)
+    log.Fatal(http.ListenAndServe(config.ListenAddr, nil))
+}