better error correction if ip syntax not correct

inc/IpHelper.h

@@ -16,7 +16,7 @@ public:
      * @param ip ip address to test
      * @return validity
      */
-    static bool isIpValid(std::string ip);
+    static bool isIpValid(const std::string& ip);
 
 private:
 };

src/FileLogger.cpp

@@ -23,8 +23,5 @@ std::string FileLogger::readip() {
     in >> ip;
 
     // when received ip has no . return 0.0.0.0
-    if (!IpHelper::isIpValid(ip))
-        return "0.0.0.0";
-    else
-        return ip;
+    return (IpHelper::isIpValid(ip) ? ip : "0.0.0.0");
 }

src/IpHelper.cpp

@@ -1,5 +1,7 @@
+#include <regex>
 #include "IpHelper.h"
 
-bool IpHelper::isIpValid(std::string ip) {
-    return (ip.find('.') != SIZE_MAX);
+bool IpHelper::isIpValid(const std::string& ip) {
+    const std::regex rgx(R"(^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$)");
+    return (std::regex_match(ip, rgx));
 }

src/api/IPAPI.cpp

@@ -1,5 +1,11 @@
+#include <IpHelper.h>
+#include <Logger.h>
 #include "api/IPAPI.h"
 
 std::string IPAPI::getGlobalIp() {
-    return request("https://api.ipify.org");
+    const std::string ip = request("https://api.ipify.org");
+    if(!IpHelper::isIpValid(ip))
+        Logger::warning("no valid ip returned from ipapi");
+
+    return ip;
 }