1 files changed, 55 insertions, 0 deletions
diff --git a/project2/cgi/cgiRequestID.cpp b/project2/cgi/cgiRequestID.cpp
new file mode 100644
index 0000000..6f4d01e
--- /dev/null
+++ b/project2/cgi/cgiRequestID.cpp
@@ -0,0 +1,55 @@
+#include <pch.hpp>
+#include <variables.h>
+#include <scriptLoader.h>
+#include <scriptStorage.h>
+#include <appEngine.h>
+#include <gcrypt.h>
+#include <scopeObject.h>
+#include <iomanip>
+
+/// Variable implementation that returns a unique ID for a page request
+class CgiRequestID : public VariableImplDyn {
+	public:
+		CgiRequestID(ScriptNodePtr e) :
+			VariableImplDyn(e)
+		{
+		}
+
+		VariableType value() const
+		{
+			gcry_md_hd_t state;
+			gcry_md_open(&state, GCRY_MD_SHA1, 0);
+			ScopeObject gcryClose([&state] { gcry_md_close(state); });
+
+			auto _env = static_cast<const CgiEnvironment *>(ApplicationEngine::getCurrent()->env());
+			gcryApplyString(state, _env->getRedirectURL());
+
+			_env->applyAllParameters([&state,this](const std::string & name, const std::string & value) {
+				gcryApplyString(state, name);
+				gcryApplyString(state, value);
+			});
+
+			return hash(state);
+		}
+
+	private:
+		static void gcryApplyString(gcry_md_hd_t & state, const std::string & str)
+		{
+			gcry_md_write(state, str.data(), str.length());
+		}
+
+		static std::string hash(gcry_md_hd_t & state)
+		{
+			int hash_len = gcry_md_get_algo_dlen(GCRY_MD_SHA1);
+			unsigned char * hash = gcry_md_read(state, GCRY_MD_SHA1);
+			std::stringstream hashstr;
+			hashstr << std::hex << std::setfill('0');
+			for (int i = 0; i < hash_len; i++) {
+				hashstr << std::setw(2) << static_cast<unsigned>(hash[i]);
+			}
+			return hashstr.str();
+		}
+};
+DECLARE_COMPONENT_LOADER("requestid", CgiRequestID, VariableLoader);
+
+