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/*
* Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
* Copyright (C) 2026 Richard Qin
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ricochet/net/http_client.hh"
#include "ricochet/net/ssl_socket.hh"
#include "ricochet/net/sys/address.hh"
#include "ricochet/net/sys/socket.hh"
#include <cstddef>
#include <format>
#include <string>
namespace ricochet::net {
namespace {
struct ParsedUrl
{
std::string host {};
std::string path {};
};
std::expected<ParsedUrl, std::string> parse_url( std::string_view url )
{
std::string_view prefix = "http://";
if ( url.starts_with( "https://" ) ) {
prefix = "https://";
} else if ( url.starts_with( "http://" ) ) {
prefix = "http://";
} else {
return std::unexpected( "Only 'http://' or 'https://' URLs are supported." );
}
url.remove_prefix( prefix.length() );
auto slash_pos = url.find( '/' );
ParsedUrl result;
if ( slash_pos == std::string_view::npos ) {
result.host = std::string( url );
result.path = "/";
} else {
result.host = std::string( url.substr( 0, slash_pos ) );
result.path = std::string( url.substr( slash_pos ) );
}
return result;
}
std::string dechunk( std::string_view body ) // NOLINT(readability-convert-member-functions-to-static)
{
std::string result;
std::size_t pos = 0;
while ( pos < body.size() ) {
// find hex length end with \r\n
auto line_end = body.find( "\r\n", pos );
if ( line_end == std::string_view::npos ) {
break;
}
// parse hex length
const std::string len_str( body.substr( pos, line_end - pos ) );
unsigned int chunk_size = 0;
try {
chunk_size = std::stoul( len_str, nullptr, 16 );
} catch ( ... ) {
break;
}
if ( chunk_size == 0 ) {
break; // end of stream
}
// extract data block (skip \r\n)
pos = line_end + 2;
if ( pos + chunk_size > body.size() ) {
break;
}
result.append( body.substr( pos, chunk_size ) );
// skip data block's \r\n
pos += chunk_size + 2;
}
return result;
}
std::string remove_html_comments( std::string html ) // NOLINT(readability-convert-member-functions-to-static)
{
std::size_t start_pos = 0;
while ( ( start_pos = html.find( "<!--", start_pos ) ) != std::string::npos ) {
auto end_pos = html.find( "-->", start_pos );
if ( end_pos != std::string::npos ) {
html.erase( start_pos, end_pos - start_pos + 3 );
} else {
html.erase( start_pos );
break;
}
}
return html;
}
std::string remove_tag_blocks( std::string html, const std::string& tag_name ) // NOLINT
{
const std::string open_tag = "<" + tag_name;
const std::string close_tag = "</" + tag_name + ">";
std::size_t start_pos = 0;
while ( ( start_pos = html.find( open_tag, start_pos ) ) != std::string::npos ) {
const std::size_t end_pos = html.find( close_tag, start_pos );
if ( end_pos != std::string::npos ) {
html.erase( start_pos, end_pos - start_pos + close_tag.length() );
} else {
html.erase( start_pos );
break;
}
}
return html;
}
} // namespace
std::expected<HttpResponse, std::string>
HttpClient::fetch( // NOLINT(readability-convert-member-functions-to-static)
std::string_view url ) const
{
auto parsed_url = parse_url( url );
if ( !parsed_url.has_value() ) {
return std::unexpected( parsed_url.error() );
}
auto [host, path] = parsed_url.value();
const bool is_https = url.starts_with( "https://" );
const std::string service = is_https ? "https" : "http";
try {
const Address server_addr( host, service );
const std::string request = std::format( "GET {} HTTP/1.1\r\n"
"Host: {}\r\n"
"User-Agent: Mozilla/5.0 (Ricochet/0.1.0)\r\n"
"Accept: text/html\r\n"
"Accept-Encoding: identity\r\n"
"Connection: close\r\n\r\n",
path,
host );
std::string raw_response;
if ( is_https ) {
SSLSocket ssl_socket;
ssl_socket.connect( server_addr, host );
size_t bytes_written = 0;
while ( bytes_written < request.size() ) {
bytes_written += ssl_socket.write( request.substr( bytes_written ) );
}
while ( !ssl_socket.eof() ) {
std::string buffer;
ssl_socket.read( buffer );
raw_response += buffer;
}
} else {
TCPSocket tcp_socket;
tcp_socket.connect( server_addr );
size_t bytes_written = 0;
while ( bytes_written < request.size() ) {
bytes_written += tcp_socket.write( request.substr( bytes_written ) );
}
while ( !tcp_socket.eof() ) {
std::string buffer;
tcp_socket.read( buffer );
raw_response += buffer;
}
}
HttpResponse response;
auto header_end = raw_response.find( "\r\n\r\n" );
if ( header_end != std::string::npos ) {
response.body = raw_response.substr( header_end + 4 );
if ( raw_response.size() >= 12 ) {
try {
response.status_code = std::stoi( raw_response.substr( 9, 3 ) );
} catch ( ... ) {
response.status_code = 0;
}
}
} else {
response.body = raw_response;
}
if ( raw_response.contains( "Transfer-Encoding: chunked" ) ) {
response.body = dechunk( response.body );
}
response.body = remove_html_comments( response.body );
response.body = remove_tag_blocks( response.body, "script" );
response.body = remove_tag_blocks( response.body, "style" );
return response;
} catch ( const std::exception& e ) {
return std::unexpected( std::string( "Network Error: " ) + e.what() );
}
}
} // namespace ricochet::net
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