Initial CPONE middleware implementation

internal/http/middleware.go

@@ -0,0 +1,30 @@
+package http
+
+import (
+	"net/http"
+	"strings"
+)
+
+func BearerAuth(staticToken string, next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if bearerToken(r.Header.Get("Authorization")) != staticToken {
+			WriteJSON(w, http.StatusUnauthorized, Response{
+				Success: false,
+				Message: "Unauthenticated.",
+				Data:    nil,
+			})
+			return
+		}
+
+		next.ServeHTTP(w, r)
+	})
+}
+
+func bearerToken(header string) string {
+	const prefix = "Bearer "
+	if !strings.HasPrefix(header, prefix) {
+		return ""
+	}
+
+	return strings.TrimSpace(strings.TrimPrefix(header, prefix))
+}