Add getProtocolFromURL to StringUtils

src/StringUtils.cpp

@@ -9,7 +9,7 @@
  * @param fileName a filename string
  * @return '' or a string with the found extension
  */
-std::string getFilenameExtension(std::string const& fileName) {
+const std::string getFilenameExtension(std::string const& fileName) {
     auto dotPos = fileName.find_last_of('.');
     if (dotPos != std::string::npos && dotPos + 1 != std::string::npos) {
         //std::cout << "StringUtils::getFilenameExtension - " << fileName.substr(dotPos + 1) << std::endl;
@@ -56,6 +56,19 @@ const std::string getHostFromURL(const std::string &url) {
     return "";
 }
 
+/**
+ * get protocol from a url
+ * @param url url string
+ * @return '' or a string with the found protocol
+ */
+const std::string getProtocolFromURL(const std::string &url) {
+    auto colonDoubleSlash = url.find("://");
+    if (colonDoubleSlash != std::string::npos) {
+        return url.substr(0, colonDoubleSlash);
+    }
+    return "";
+}
+
 /**
  * convert string to lowercase
  * @param str string

src/StringUtils.h

@@ -3,9 +3,10 @@
 
 #include <string>
 
-std::string getFilenameExtension(std::string const& fileName);
+const std::string getFilenameExtension(std::string const& fileName);
 const std::string getDocumentFromURL(const std::string &url);
 const std::string getHostFromURL(const std::string &url);
+const std::string getProtocolFromURL(const std::string &url);
 const std::string toLowercase(const std::string &str);
 
 #endif