update apis

include/fc/crypto/elliptic.hpp

@@ -99,7 +99,7 @@ namespace fc {
             */
            fc::sha512 get_shared_secret( const public_key& pub )const;
 
-           signature         sign( const fc::sha256& digest );
+           signature         sign( const fc::sha256& digest )const;
            compact_signature sign_compact( const fc::sha256& digest )const;
            bool              verify( const fc::sha256& digest, const signature& sig );
 

include/fc/string.hpp

@@ -21,6 +21,8 @@ namespace fc
   class variant_object;
   fc::string format_string( const fc::string&, const variant_object& );
   fc::string trim( const fc::string& );
+  fc::string to_lower( const fc::string& );
+  string trim_and_normalize_spaces( const string& s );
 }
 
 #else

src/crypto/elliptic.cpp

@@ -357,7 +357,7 @@ namespace fc { namespace ecc {
        return self;
     }
 
-    signature private_key::sign( const fc::sha256& digest )
+    signature private_key::sign( const fc::sha256& digest )const
     {
         unsigned int buf_len = ECDSA_size(my->_key);
 //        fprintf( stderr, "%d  %d\n", buf_len, sizeof(sha256) );

src/string.cpp

@@ -104,9 +104,25 @@ namespace fc  {
   }
   std::string trim( const std::string& s )
   {
+      return boost::algorithm::trim_copy(s);
+      /*
       std::string cpy(s);
       boost::algorithm::trim(cpy);
       return cpy;
+      */
+  }
+  std::string to_lower( const std::string& s )
+  {
+     auto tmp = s;
+     boost::algorithm::to_lower(tmp);
+     return tmp;
+  }
+  string trim_and_normalize_spaces( const string& s )
+  {
+     string result = boost::algorithm::trim_copy( s );
+     while( result.find( "  " ) != result.npos )
+       boost::algorithm::replace_all( result, "  ", " " );
+     return result;
   }
 
 } // namespace fc