Added URL::Parm and URL::ParmList for parsing URL parameters.

openvpn/http/urlparm.hpp

@@ -0,0 +1,134 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2015 OpenVPN Technologies, Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef OPENVPN_HTTP_URLPARM_H
+#define OPENVPN_HTTP_URLPARM_H
+
+#include <string>
+#include <sstream>
+#include <vector>
+
+#include <openvpn/http/urlencode.hpp>
+#include <openvpn/http/webexcept.hpp>
+#include <openvpn/common/string.hpp>
+
+namespace openvpn {
+  namespace URL {
+    OPENVPN_EXCEPTION(url_parameter_error);
+
+    struct Parm
+    {
+      Parm() {}
+
+      Parm(const std::string& name_arg, const std::string& value_arg)
+	: name(name_arg), value(value_arg)
+      {
+      }
+
+      std::string to_string() const
+      {
+	std::ostringstream out;
+	out << name << '=' << value;
+	return out.str();
+      }
+
+      std::string name;
+      std::string value;
+    };
+
+    class ParmList : public std::vector<Parm>
+    {
+    public:
+      ParmList(const std::string& uri)
+      {
+	try {
+	  const std::vector<std::string> req_parms = string::split(uri, '?', 1);
+	  request_ = req_parms[0];
+	  if (req_parms.size() == 2)
+	    {
+	      const std::vector<std::string> kv_list = string::split(req_parms[1], '&');
+	      for (auto &kvstr : kv_list)
+		{
+		  const std::vector<std::string> kv = string::split(kvstr, '=', 1);
+		  Parm p;
+		  p.name = decode(kv[0]);
+		  if (kv.size() == 2)
+		    p.value = decode(kv[1]);
+		  push_back(std::move(p));
+		}
+	    }
+	}
+	catch (const std::exception& e)
+	  {
+	    throw HTTP::WebException(HTTP::Status::BadRequest, e.what());
+	  }
+      }
+
+      const Parm* get(const std::string& key) const
+      {
+	for (auto &p : *this)
+	  {
+	    if (key == p.name)
+	      return &p;
+	  }
+	return nullptr;
+      }
+
+      const std::string get_value(const std::string& key) const
+      {
+	const Parm* p = get(key);
+	if (p)
+	  return p->value;
+	else
+	  return "";
+      }
+
+      std::string to_string() const
+      {
+	std::ostringstream out;
+	for (size_t i = 0; i < size(); ++i)
+	  out << '[' << i << "] " << (*this)[i].to_string() << std::endl;
+	return out.str();
+      }
+
+      std::string request(const bool remove_leading_slash) const
+      {
+	std::string ret = request_;
+	if (remove_leading_slash)
+	  {
+	    if (ret.length() > 0 && ret[0] == '/')
+	      ret = ret.substr(1);
+	    else
+	      throw HTTP::WebException(HTTP::Status::BadRequest, "URI missing leading slash");
+	  }
+	if (ret.empty())
+	  throw HTTP::WebException(HTTP::Status::BadRequest, "URI resource is empty");
+	return ret;
+      }
+
+    private:
+      std::string request_;
+    };
+
+  }
+}
+
+#endif