Allow wallet2.h to run in WebAssembly

- Add abstract_http_client.h which http_client.h extends.
- Replace simple_http_client with abstract_http_client in wallet2,
message_store, message_transporter, and node_rpc_proxy.
- Import and export wallet data in wallet2.
- Use #if defined __EMSCRIPTEN__ directives to skip incompatible code.

6 files changed, 260 insertions, 159 deletions

diff --git a/contrib/epee/include/net/abstract_http_client.h b/contrib/epee/include/net/abstract_http_client.h
new file mode 100644
index 000000000..787ae2667
--- /dev/null
+++ b/contrib/epee/include/net/abstract_http_client.h
@@ -0,0 +1,87 @@
+// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+// * Neither the name of the Andrey N. Sabelnikov nor the
+// names of its contributors may be used to endorse or promote products
+// derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER  BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include <string>
+#include <boost/optional/optional.hpp>
+#include "http_auth.h"
+#include "net/net_ssl.h"
+
+namespace epee
+{
+namespace net_utils
+{
+  inline const char* get_hex_vals()
+  {
+    static constexpr const char hexVals[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
+    return hexVals;
+  }
+
+  inline const char* get_unsave_chars()
+  {
+    //static constexpr char unsave_chars[] = "\"<>%\\^[]`+$,@:;/!#?=&";
+    static constexpr const char unsave_chars[] = "\"<>%\\^[]`+$,@:;!#&";
+    return unsave_chars;
+  }
+
+  bool is_unsafe(unsigned char compare_char);
+  std::string dec_to_hex(char num, int radix);
+  int get_index(const char *s, char c);
+  std::string hex_to_dec_2bytes(const char *s);
+  std::string convert(char val);
+  std::string conver_to_url_format(const std::string& uri);
+  std::string convert_from_url_format(const std::string& uri);
+  std::string convert_to_url_format_force_all(const std::string& uri);
+
+namespace http
+{
+  class abstract_http_client
+  {
+  public:
+    abstract_http_client() {}
+    virtual ~abstract_http_client() {}
+    bool set_server(const std::string& address, boost::optional<login> user, ssl_options_t ssl_options = ssl_support_t::e_ssl_support_autodetect);
+    virtual void set_server(std::string host, std::string port, boost::optional<login> user, ssl_options_t ssl_options = ssl_support_t::e_ssl_support_autodetect) = 0;
+    virtual void set_auto_connect(bool auto_connect) = 0;
+    virtual bool connect(std::chrono::milliseconds timeout) = 0;
+    virtual bool disconnect() = 0;
+    virtual bool is_connected(bool *ssl = NULL) = 0;
+    virtual bool invoke(const boost::string_ref uri, const boost::string_ref method, const std::string& body, std::chrono::milliseconds timeout, const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list()) = 0;
+    virtual bool invoke_get(const boost::string_ref uri, std::chrono::milliseconds timeout, const std::string& body = std::string(), const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list()) = 0;
+    virtual bool invoke_post(const boost::string_ref uri, const std::string& body, std::chrono::milliseconds timeout, const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list()) = 0;
+    virtual uint64_t get_bytes_sent() const = 0;
+    virtual uint64_t get_bytes_received() const = 0;
+  };
+
+  class http_client_factory
+  {
+  public:
+    virtual ~http_client_factory() {}
+    virtual std::unique_ptr<abstract_http_client> create() = 0;
+  };
+}
+}
+}
diff --git a/contrib/epee/include/net/http_client.h b/contrib/epee/include/net/http_client.h
index 588d5f0e3..d329b8cf2 100644
--- a/contrib/epee/include/net/http_client.h
+++ b/contrib/epee/include/net/http_client.h
@@ -47,6 +47,7 @@
 
 #include "string_tools.h"
 #include "reg_exp_definer.h"
+#include "abstract_http_client.h"
 #include "http_base.h" 
 #include "http_auth.h"
 #include "to_nonconst_iterator.h"
@@ -105,140 +106,11 @@ namespace net_utils
 
 
 	//---------------------------------------------------------------------------
-	static inline const char* get_hex_vals()
-	{
-		static const char hexVals[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
-		return hexVals;
-	}
-
-	static inline const char* get_unsave_chars()
-	{
-		//static char unsave_chars[] = "\"<>%\\^[]`+$,@:;/!#?=&";
-		static const char unsave_chars[] = "\"<>%\\^[]`+$,@:;!#&";
-		return unsave_chars;
-	}
-
-	static inline bool is_unsafe(unsigned char compare_char)
-	{
-		if(compare_char <= 32 || compare_char >= 123)
-			return true;
-
-		const char* punsave = get_unsave_chars();
-
-		for(int ichar_pos = 0; 0!=punsave[ichar_pos] ;ichar_pos++)
-			if(compare_char == punsave[ichar_pos])
-				return true;
-
-		return false;
-	}
-	
-	static inline 
-		std::string dec_to_hex(char num, int radix)
-	{
-		int temp=0;
-		std::string csTmp;
-		int num_char;
-
-		num_char = (int) num;
-		if (num_char < 0)
-			num_char = 256 + num_char;
-
-		while (num_char >= radix)
-		{
-			temp = num_char % radix;
-			num_char = (int)floor((float)num_char / (float)radix);
-			csTmp = get_hex_vals()[temp];
-		}
-
-		csTmp += get_hex_vals()[num_char];
-
-		if(csTmp.size() < 2)
-		{
-			csTmp += '0';
-		}
-		
-		std::reverse(csTmp.begin(), csTmp.end());
-		//_mbsrev((unsigned char*)csTmp.data());
-
-		return csTmp;
-	}
-	static inline int get_index(const char *s, char c) { const char *ptr = (const char*)memchr(s, c, 16); return ptr ? ptr-s : -1; }
-	static inline 
-		std::string hex_to_dec_2bytes(const char *s)
-	{
-		const char *hex = get_hex_vals();
-		int i0 = get_index(hex, toupper(s[0]));
-		int i1 = get_index(hex, toupper(s[1]));
-		if (i0 < 0 || i1 < 0)
-			return std::string("%") + std::string(1, s[0]) + std::string(1, s[1]);
-		return std::string(1, i0 * 16 | i1);
-	}
-
-	static inline std::string convert(char val)
-	{
-		std::string csRet;
-		csRet += "%";
-		csRet += dec_to_hex(val, 16);
-		return  csRet;
-	}
-	static inline std::string conver_to_url_format(const std::string& uri)
-	{
-
-		std::string result;
-
-		for(size_t i = 0; i!= uri.size(); i++)
-		{
-			if(is_unsafe(uri[i]))
-				result += convert(uri[i]);
-			else
-				result += uri[i];
-
-		}
-
-		return result;
-	}
-	static inline std::string convert_from_url_format(const std::string& uri)
-	{
-
-		std::string result;
-
-		for(size_t i = 0; i!= uri.size(); i++)
-		{
-			if(uri[i] == '%' && i + 2 < uri.size())
-			{
-				result += hex_to_dec_2bytes(uri.c_str() + i + 1);
-				i += 2;
-			}
-			else
-				result += uri[i];
-
-		}
-
-		return result;
-	}
-
-  static inline std::string convert_to_url_format_force_all(const std::string& uri)
-  {
-
-    std::string result;
-
-    for(size_t i = 0; i!= uri.size(); i++)
-    {
-        result += convert(uri[i]);
-    }
-
-    return result;
-  }
-
-
-
-
-
 	namespace http
 	{
 
 		template<typename net_client_type>
-		class http_simple_client_template: public i_target_handler
+    class http_simple_client_template : public i_target_handler, public abstract_http_client
 		{
 		private:
 			enum reciev_machine_state
@@ -279,7 +151,7 @@ namespace net_utils
 
 		public:
 			explicit http_simple_client_template()
-				: i_target_handler()
+				: i_target_handler(), abstract_http_client()
 				, m_net_client()
 				, m_host_buff()
 				, m_port()
@@ -299,26 +171,19 @@ namespace net_utils
 			const std::string &get_host() const { return m_host_buff; };
 			const std::string &get_port() const { return m_port; };
 
-			bool set_server(const std::string& address, boost::optional<login> user, ssl_options_t ssl_options = ssl_support_t::e_ssl_support_autodetect)
-			{
-				http::url_content parsed{};
-				const bool r = parse_url(address, parsed);
-				CHECK_AND_ASSERT_MES(r, false, "failed to parse url: " << address);
-				set_server(std::move(parsed.host), std::to_string(parsed.port), std::move(user), std::move(ssl_options));
-				return true;
-			}
+			using abstract_http_client::set_server;
 
-			void set_server(std::string host, std::string port, boost::optional<login> user, ssl_options_t ssl_options = ssl_support_t::e_ssl_support_autodetect)
+			void set_server(std::string host, std::string port, boost::optional<login> user, ssl_options_t ssl_options = ssl_support_t::e_ssl_support_autodetect) override
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
 				disconnect();
 				m_host_buff = std::move(host);
 				m_port = std::move(port);
-                                m_auth = user ? http_client_auth{std::move(*user)} : http_client_auth{};
+				m_auth = user ? http_client_auth{std::move(*user)} : http_client_auth{};
 				m_net_client.set_ssl(std::move(ssl_options));
 			}
 
-			void set_auto_connect(bool auto_connect)
+			void set_auto_connect(bool auto_connect) override
 			{
 				m_auto_connect = auto_connect;
 			}
@@ -330,25 +195,25 @@ namespace net_utils
 				m_net_client.set_connector(std::move(connector));
 			}
 
-      bool connect(std::chrono::milliseconds timeout)
+      bool connect(std::chrono::milliseconds timeout) override
       {
         CRITICAL_REGION_LOCAL(m_lock);
         return m_net_client.connect(m_host_buff, m_port, timeout);
       }
 			//---------------------------------------------------------------------------
-			bool disconnect()
+			bool disconnect() override
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
 				return m_net_client.disconnect();
 			}
 			//---------------------------------------------------------------------------
-			bool is_connected(bool *ssl = NULL)
+			bool is_connected(bool *ssl = NULL) override
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
 				return m_net_client.is_connected(ssl);
 			}
 			//---------------------------------------------------------------------------
-			virtual bool handle_target_data(std::string& piece_of_transfer)
+			virtual bool handle_target_data(std::string& piece_of_transfer) override
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
 				m_response_info.m_body += piece_of_transfer;
@@ -361,15 +226,14 @@ namespace net_utils
         return true;
       }
 			//---------------------------------------------------------------------------
-			inline 
-				bool invoke_get(const boost::string_ref uri, std::chrono::milliseconds timeout, const std::string& body = std::string(), const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list())
+			inline bool invoke_get(const boost::string_ref uri, std::chrono::milliseconds timeout, const std::string& body = std::string(), const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list()) override
 			{
 					CRITICAL_REGION_LOCAL(m_lock);
 					return invoke(uri, "GET", body, timeout, ppresponse_info, additional_params);
 			}
 
 			//---------------------------------------------------------------------------
-			inline bool invoke(const boost::string_ref uri, const boost::string_ref method, const std::string& body, std::chrono::milliseconds timeout, const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list())
+			inline bool invoke(const boost::string_ref uri, const boost::string_ref method, const std::string& body, std::chrono::milliseconds timeout, const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list()) override
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
 				if(!is_connected())
@@ -442,7 +306,7 @@ namespace net_utils
 				return false;
 			}
 			//---------------------------------------------------------------------------
-			inline bool invoke_post(const boost::string_ref uri, const std::string& body, std::chrono::milliseconds timeout, const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list())
+			inline bool invoke_post(const boost::string_ref uri, const std::string& body, std::chrono::milliseconds timeout, const http_response_info** ppresponse_info = NULL, const fields_list& additional_params = fields_list()) override
 			{
 				CRITICAL_REGION_LOCAL(m_lock);
 				return invoke(uri, "POST", body, timeout, ppresponse_info, additional_params);
@@ -456,12 +320,12 @@ namespace net_utils
 				return handle_reciev(timeout);
 			}
 			//---------------------------------------------------------------------------
-			uint64_t get_bytes_sent() const
+			uint64_t get_bytes_sent() const override
 			{
 				return m_net_client.get_bytes_sent();
 			}
 			//---------------------------------------------------------------------------
-			uint64_t get_bytes_received() const
+			uint64_t get_bytes_received() const override
 			{
 				return m_net_client.get_bytes_received();
 			}
@@ -1016,6 +880,14 @@ namespace net_utils
 			}
 		};
 		typedef http_simple_client_template<blocked_mode_client> http_simple_client;
+
+    class http_simple_client_factory : public http_client_factory
+    {
+    public:
+      std::unique_ptr<abstract_http_client> create() override {
+        return std::unique_ptr<epee::net_utils::http::abstract_http_client>(new epee::net_utils::http::http_simple_client());
+      }
+    };
 	}
 }
 }
diff --git a/contrib/epee/include/storages/http_abstract_invoke.h b/contrib/epee/include/storages/http_abstract_invoke.h
index 78e02c93a..a8bc945a8 100644
--- a/contrib/epee/include/storages/http_abstract_invoke.h
+++ b/contrib/epee/include/storages/http_abstract_invoke.h
@@ -38,7 +38,7 @@ namespace epee
   namespace net_utils
   {
     template<class t_request, class t_response, class t_transport>
-    bool invoke_http_json(const boost::string_ref uri, const t_request& out_struct, t_response& result_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref method = "GET")
+    bool invoke_http_json(const boost::string_ref uri, const t_request& out_struct, t_response& result_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref method = "POST")
     {
       std::string req_param;
       if(!serialization::store_t_to_json(out_struct, req_param))
@@ -72,7 +72,7 @@ namespace epee
 
 
     template<class t_request, class t_response, class t_transport>
-    bool invoke_http_bin(const boost::string_ref uri, const t_request& out_struct, t_response& result_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref method = "GET")
+    bool invoke_http_bin(const boost::string_ref uri, const t_request& out_struct, t_response& result_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref method = "POST")
     {
       std::string req_param;
       if(!serialization::store_t_to_binary(out_struct, req_param))
@@ -101,7 +101,7 @@ namespace epee
     }
 
     template<class t_request, class t_response, class t_transport>
-    bool invoke_http_json_rpc(const boost::string_ref uri, std::string method_name, const t_request& out_struct, t_response& result_struct, epee::json_rpc::error &error_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "GET", const std::string& req_id = "0")
+    bool invoke_http_json_rpc(const boost::string_ref uri, std::string method_name, const t_request& out_struct, t_response& result_struct, epee::json_rpc::error &error_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "POST", const std::string& req_id = "0")
     {
       epee::json_rpc::request<t_request> req_t = AUTO_VAL_INIT(req_t);
       req_t.jsonrpc = "2.0";
@@ -125,14 +125,14 @@ namespace epee
     }
 
     template<class t_request, class t_response, class t_transport>
-    bool invoke_http_json_rpc(const boost::string_ref uri, std::string method_name, const t_request& out_struct, t_response& result_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "GET", const std::string& req_id = "0")
+    bool invoke_http_json_rpc(const boost::string_ref uri, std::string method_name, const t_request& out_struct, t_response& result_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "POST", const std::string& req_id = "0")
     {
       epee::json_rpc::error error_struct;
       return invoke_http_json_rpc(uri, method_name, out_struct, result_struct, error_struct, transport, timeout, http_method, req_id);
     }
 
     template<class t_command, class t_transport>
-    bool invoke_http_json_rpc(const boost::string_ref uri, typename t_command::request& out_struct, typename t_command::response& result_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "GET", const std::string& req_id = "0")
+    bool invoke_http_json_rpc(const boost::string_ref uri, typename t_command::request& out_struct, typename t_command::response& result_struct, t_transport& transport, std::chrono::milliseconds timeout = std::chrono::seconds(15), const boost::string_ref http_method = "POST", const std::string& req_id = "0")
     {
       return invoke_http_json_rpc(uri, t_command::methodname(), out_struct, result_struct, transport, timeout, http_method, req_id);
     }
diff --git a/contrib/epee/include/syncobj.h b/contrib/epee/include/syncobj.h
index dba02f270..804bafda7 100644
--- a/contrib/epee/include/syncobj.h
+++ b/contrib/epee/include/syncobj.h
@@ -150,7 +150,7 @@ namespace epee
   };
 
 
-#define  CRITICAL_REGION_LOCAL(x) {boost::this_thread::sleep_for(boost::chrono::milliseconds(epee::debug::g_test_dbg_lock_sleep()));}   epee::critical_region_t<decltype(x)>   critical_region_var(x)
+#define  CRITICAL_REGION_LOCAL(x) {} epee::critical_region_t<decltype(x)>   critical_region_var(x)
 #define  CRITICAL_REGION_BEGIN(x) { boost::this_thread::sleep_for(boost::chrono::milliseconds(epee::debug::g_test_dbg_lock_sleep())); epee::critical_region_t<decltype(x)>   critical_region_var(x)
 #define  CRITICAL_REGION_LOCAL1(x) {boost::this_thread::sleep_for(boost::chrono::milliseconds(epee::debug::g_test_dbg_lock_sleep()));} epee::critical_region_t<decltype(x)>   critical_region_var1(x)
 #define  CRITICAL_REGION_BEGIN1(x) {  boost::this_thread::sleep_for(boost::chrono::milliseconds(epee::debug::g_test_dbg_lock_sleep())); epee::critical_region_t<decltype(x)>   critical_region_var1(x)
diff --git a/contrib/epee/src/CMakeLists.txt b/contrib/epee/src/CMakeLists.txt
index 5201f59c2..88018d71a 100644
--- a/contrib/epee/src/CMakeLists.txt
+++ b/contrib/epee/src/CMakeLists.txt
@@ -26,7 +26,7 @@
 # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 # THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-add_library(epee STATIC byte_slice.cpp hex.cpp http_auth.cpp mlog.cpp net_helper.cpp net_utils_base.cpp string_tools.cpp wipeable_string.cpp
+add_library(epee STATIC byte_slice.cpp hex.cpp abstract_http_client.cpp http_auth.cpp mlog.cpp net_helper.cpp net_utils_base.cpp string_tools.cpp wipeable_string.cpp
     levin_base.cpp memwipe.c connection_basic.cpp network_throttle.cpp network_throttle-detail.cpp mlocker.cpp buffer.cpp net_ssl.cpp
     int-util.cpp)
 
diff --git a/contrib/epee/src/abstract_http_client.cpp b/contrib/epee/src/abstract_http_client.cpp
new file mode 100644
index 000000000..98b5b67d9
--- /dev/null
+++ b/contrib/epee/src/abstract_http_client.cpp
@@ -0,0 +1,142 @@
+#include "net/abstract_http_client.h"
+#include "net/http_base.h"
+#include "net/net_parse_helpers.h"
+
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "net.http"
+
+namespace epee
+{
+namespace net_utils
+{
+  //----------------------------------------------------------------------------------------------------
+  bool is_unsafe(unsigned char compare_char)
+  {
+    if(compare_char <= 32 || compare_char >= 123)
+      return true;
+
+    const char* punsave = get_unsave_chars();
+
+    for(int ichar_pos = 0; 0!=punsave[ichar_pos] ;ichar_pos++)
+      if(compare_char == punsave[ichar_pos])
+        return true;
+
+    return false;
+  }
+  //----------------------------------------------------------------------------------------------------
+  std::string dec_to_hex(char num, int radix)
+  {
+    int temp=0;
+    std::string csTmp;
+    int num_char;
+
+    num_char = (int) num;
+    if (num_char < 0)
+      num_char = 256 + num_char;
+
+    while (num_char >= radix)
+    {
+      temp = num_char % radix;
+      num_char = (int)floor((float)num_char / (float)radix);
+      csTmp = get_hex_vals()[temp];
+    }
+
+    csTmp += get_hex_vals()[num_char];
+
+    if(csTmp.size() < 2)
+    {
+      csTmp += '0';
+    }
+
+    std::reverse(csTmp.begin(), csTmp.end());
+    //_mbsrev((unsigned char*)csTmp.data());
+
+    return csTmp;
+  }
+  //----------------------------------------------------------------------------------------------------
+  int get_index(const char *s, char c)
+  {
+    const char *ptr = (const char*)memchr(s, c, 16);
+    return ptr ? ptr-s : -1;
+  }
+  //----------------------------------------------------------------------------------------------------
+  std::string hex_to_dec_2bytes(const char *s)
+  {
+    const char *hex = get_hex_vals();
+    int i0 = get_index(hex, toupper(s[0]));
+    int i1 = get_index(hex, toupper(s[1]));
+    if (i0 < 0 || i1 < 0)
+      return std::string("%") + std::string(1, s[0]) + std::string(1, s[1]);
+    return std::string(1, i0 * 16 | i1);
+  }
+  //----------------------------------------------------------------------------------------------------
+  std::string convert(char val)
+  {
+    std::string csRet;
+    csRet += "%";
+    csRet += dec_to_hex(val, 16);
+    return  csRet;
+  }
+  //----------------------------------------------------------------------------------------------------
+  std::string conver_to_url_format(const std::string& uri)
+  {
+
+    std::string result;
+
+    for(size_t i = 0; i!= uri.size(); i++)
+    {
+      if(is_unsafe(uri[i]))
+        result += convert(uri[i]);
+      else
+        result += uri[i];
+
+    }
+
+    return result;
+  }
+  //----------------------------------------------------------------------------------------------------
+  std::string convert_from_url_format(const std::string& uri)
+  {
+
+    std::string result;
+
+    for(size_t i = 0; i!= uri.size(); i++)
+    {
+      if(uri[i] == '%' && i + 2 < uri.size())
+      {
+        result += hex_to_dec_2bytes(uri.c_str() + i + 1);
+        i += 2;
+      }
+      else
+        result += uri[i];
+
+    }
+
+    return result;
+  }
+  //----------------------------------------------------------------------------------------------------
+  std::string convert_to_url_format_force_all(const std::string& uri)
+  {
+    std::string result;
+
+    for(size_t i = 0; i!= uri.size(); i++)
+    {
+        result += convert(uri[i]);
+    }
+    return result;
+  }
+
+namespace http
+{
+  //----------------------------------------------------------------------------------------------------
+  bool epee::net_utils::http::abstract_http_client::set_server(const std::string& address, boost::optional<login> user, ssl_options_t ssl_options)
+  {
+    http::url_content parsed{};
+    const bool r = parse_url(address, parsed);
+    CHECK_AND_ASSERT_MES(r, false, "failed to parse url: " << address);
+    set_server(std::move(parsed.host), std::to_string(parsed.port), std::move(user), std::move(ssl_options));
+    return true;
+  }
+}
+}
+}