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#include <pch.hpp>
#include <variables.h>
#include "cgiRequestContext.h"
#include <scriptLoader.h>
#include <scriptStorage.h>
#include <gcrypt.h>
#include <scopeExit.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(ExecContext * ec) const
{
gcry_md_hd_t state;
gcry_md_open(&state, GCRY_MD_SHA1, 0);
AdHoc::ScopeExit gcryClose([&state] { gcry_md_close(state); });
auto crc = static_cast<const CgiRequestContext *>(ec);
gcryApplyString(state, crc->getRedirectURL());
crc->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);
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