Issue #1356 - Improve detection of the issuer of the request

src/shared/Utils.h

Index: src/shared/Utils.h
===================================================================
--- a/src/shared/Utils.h
+++ b/src/shared/Utils.h
@@ -42,12 +42,42 @@
 template<class T>
 T TrimString(T text)
 {
+  std::function<bool(T::value_type)> isspace = std::bind(&std::isspace<T::value_type>, std::placeholders::_1, std::locale::classic());
+  return TrimString(text, isspace);
+}
+
+template<class T>
+T TrimString(T text, std::function<bool(typename T::value_type)> differentiator)

[sergei, 2014/11/03 14:17:46]

const references are missed.

+{
   // Via http://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring
   T trimmed(text);
-  std::function<bool(T::value_type)> isspace = std::bind(&std::isspace<T::value_type>, std::placeholders::_1, std::locale::classic());
-  trimmed.erase(trimmed.begin(), std::find_if(trimmed.begin(), trimmed.end(), std::not1(isspace)));
-  trimmed.erase(std::find_if(trimmed.rbegin(), trimmed.rend(), std::not1(isspace)).base(), trimmed.end());
+  trimmed.erase(trimmed.begin(), std::find_if(trimmed.begin(), trimmed.end(), std::not1(differentiator)));
+  trimmed.erase(std::find_if(trimmed.rbegin(), trimmed.rend(), std::not1(differentiator)).base(), trimmed.end());
   return trimmed;
 }
+
+template <class T>
+T CreateConstString(std::string val);

[sergei, 2014/11/03 14:17:46]

`cosnt std::string&`

+
+template <class T>
+T ExtractHttpHeader(const T& allHeaders, T& targetHeaderName, const T& delimiter = CreateConstString<T>("\n"))
+{
+  std::function<bool(T::value_type)> ispunct = std::bind(&std::ispunct<T::value_type>, std::placeholders::_1, std::locale::classic());
+  targetHeaderName = TrimString(targetHeaderName, ispunct);
+  const T colon = CreateConstString<T>(":");
+  targetHeaderName.append(colon);
+  auto targetHeaderBeginsAt = allHeaders.find(targetHeaderName);
+  if (targetHeaderBeginsAt == T::npos)
+  {
+    return T();
+  }
+  targetHeaderBeginsAt += targetHeaderName.length();
+  auto targetHeaderEndsAt = allHeaders.find(delimiter, targetHeaderBeginsAt);
+  if (targetHeaderEndsAt == T::npos)
+  {
+    return T();
+  }
+  return allHeaders.substr(targetHeaderBeginsAt, targetHeaderEndsAt - targetHeaderBeginsAt);
+}
 
 #endif // UTILS_H