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//
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//
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// Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com)
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// Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com)
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//
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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//
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// Official repository: https://github.com/cppalliance/http
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// Official repository: https://github.com/cppalliance/http
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//
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//
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#include <boost/http/server/encode_url.hpp>
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#include <boost/http/server/encode_url.hpp>
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namespace boost {
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namespace boost {
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namespace http {
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namespace http {
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namespace {
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namespace {
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// Check if character needs encoding
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// Check if character needs encoding
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// Unreserved + reserved chars that are allowed in URLs
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// Unreserved + reserved chars that are allowed in URLs
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bool
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bool
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is_safe( char c ) noexcept
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is_safe( char c ) noexcept
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{
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{
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    // Unreserved: A-Z a-z 0-9 - _ . ~
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    // Unreserved: A-Z a-z 0-9 - _ . ~
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    if( ( c >= 'A' && c <= 'Z' ) ||
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    if( ( c >= 'A' && c <= 'Z' ) ||
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        ( c >= 'a' && c <= 'z' ) ||
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        ( c >= 'a' && c <= 'z' ) ||
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        ( c >= '0' && c <= '9' ) ||
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        ( c >= '0' && c <= '9' ) ||
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        c == '-' || c == '_' || c == '.' || c == '~' )
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        c == '-' || c == '_' || c == '.' || c == '~' )
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        return true;
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        return true;
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    // Reserved chars allowed in URLs: ! # $ & ' ( ) * + , / : ; = ? @
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    // Reserved chars allowed in URLs: ! # $ & ' ( ) * + , / : ; = ? @
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    switch( c )
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    switch( c )
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    {
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    {
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    case '!':
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    case '!':
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    case '#':
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    case '#':
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    case '$':
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    case '$':
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    case '&':
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    case '&':
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    case '\'':
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    case '\'':
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    case '(':
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    case '(':
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    case ')':
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    case ')':
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    case '*':
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    case '*':
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    case '+':
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    case '+':
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    case ',':
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    case ',':
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    case '/':
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    case '/':
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    case ':':
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    case ':':
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    case ';':
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    case ';':
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    case '=':
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    case '=':
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    case '?':
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    case '?':
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    case '@':
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    case '@':
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        return true;
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        return true;
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    default:
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    default:
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        return false;
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        return false;
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    }
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    }
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}
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}
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constexpr char hex_chars[] = "0123456789ABCDEF";
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constexpr char hex_chars[] = "0123456789ABCDEF";
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} // (anon)
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} // (anon)
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std::string
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std::string
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encode_url( core::string_view url )
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encode_url( core::string_view url )
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{
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{
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    std::string result;
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    std::string result;
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    result.reserve( url.size() );
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    result.reserve( url.size() );
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    for( unsigned char c : url )
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    for( unsigned char c : url )
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    {
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    {
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        if( is_safe( static_cast<char>( c ) ) )
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        if( is_safe( static_cast<char>( c ) ) )
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        {
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        {
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            result.push_back( static_cast<char>( c ) );
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            result.push_back( static_cast<char>( c ) );
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        }
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        }
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        else
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        else
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        {
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        {
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            result.push_back( '%' );
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            result.push_back( '%' );
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            result.push_back( hex_chars[c >> 4] );
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            result.push_back( hex_chars[c >> 4] );
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            result.push_back( hex_chars[c & 0x0F] );
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            result.push_back( hex_chars[c & 0x0F] );
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        }
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        }
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    }
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    }
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    return result;
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    return result;
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}
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}
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} // http
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} // http
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} // boost
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} // boost