/
http_client_sync.cc
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/
http_client_sync.cc
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//https://www.boost.org/doc/libs/master/libs/beast/example/http/client/sync/http_client_sync.cpp
//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
//------------------------------------------------------------------------------
//
// Example: HTTP client, synchronous
//
//------------------------------------------------------------------------------
//[example_http_client
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <cstdlib>
#include <iostream>
#include <string>
/* davep 20210616 ; adding base64 */
//#include "base64.h"
#include "netrc.hpp"
/* davep 20210730 ; new base64 library via vcpkg */
// https://renenyffenegger.ch/notes/development/Base64/Encoding-and-decoding-base-64-with-cpp/
#include "cpp-base64/base64.h"
//#include "n-json.h"
#include <nlohmann/json.hpp>
namespace beast = boost::beast; // from <boost/beast.hpp>
namespace http = beast::http; // from <boost/beast/http.hpp>
namespace net = boost::asio; // from <boost/asio.hpp>
using tcp = net::ip::tcp; // from <boost/asio/ip/tcp.hpp>
// https://www.boost.org/community/error_handling.html
struct NoPasswordException : std::runtime_error
{
NoPasswordException() : std::runtime_error("Missing Password") { }
};
struct TransactionFailedException : std::runtime_error
{
TransactionFailedException() : std::runtime_error("api call failed") { }
TransactionFailedException(const char* errmsg) : std::runtime_error(errmsg) { }
};
void check_netrc(std::string host, std::string& username, std::string& password)
{
netrc_map netrc;
try {
netrc = netrc_parse_default_file();
}
catch (file_error& err) {
return;
}
while(1) {
try {
auto [netrc_login, netrc_password, netrc_account] = netrc.at(host);
username = std::move(netrc_login);
password = std::move(netrc_password);
return;
}
catch (file_error& err) {
}
catch (std::out_of_range & err) {
std::clog << "netrc has no entry for " << host << "\n";
}
if (host == "default") {
return;
}
host = "default";
}
}
// Performs an HTTP GET and prints the response
int main(int argc, char** argv)
{
try
{
// Check command line arguments.
if(argc != 4 && argc != 5)
{
std::cerr <<
"Usage: http-client-sync <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
"Example:\n" <<
" http-client-sync www.example.com 80 /\n" <<
" http-client-sync www.example.com 80 / 1.0\n";
return EXIT_FAILURE;
}
auto const host = argv[1];
auto const port = argv[2];
auto const target = argv[3];
int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
// The io_context is required for all I/O
net::io_context ioc;
// These objects perform our I/O
tcp::resolver resolver(ioc);
beast::tcp_stream stream(ioc);
// Look up the domain name
auto const results = resolver.resolve(host, port);
// Make the connection on the IP address we get from a lookup
stream.connect(results);
// Set up an HTTP GET request message
http::request<http::string_body> req{http::verb::get, target, version};
req.set(http::field::host, host);
req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
std::string username { "admin" };
std::string password;
// read netrc before trying higher priority methods
check_netrc(target, username, password);
/* davep 20210615 ; attempt http auth */
const char *pw = getenv("CP_PASSWORD");
if (pw) {
password.assign(pw);
}
if ( password.empty() ) {
throw NoPasswordException();
}
// std::string password = pw;
// std::string username { "admin" };
std::string upw = username + ":" + password;
std::string auth = "Basic " + base64_encode(upw);
// std::cout << "auth=" << auth << "\n";
req.set(http::field::authorization, auth);
// Send the HTTP request to the remote host
http::write(stream, req);
// This buffer is used for reading and must be persisted
beast::flat_buffer buffer;
// davep 20210617 ; change body to std::string to make getting data for
// json parsing easier
// Declare a container to hold the response
http::response<http::string_body> res;
// http::response<http::dynamic_body> res;
// Receive the HTTP response
http::read(stream, buffer, res);
#if 0
// Write the message to standard out
// std::cout << res << std::endl;
std::cout << "result=" << res.result() << "\n";
std::cout << "result_int=" << res.result_int() << "\n";
std::cout << "reason=" << res.reason() << "\n";
// std::string buf;
// std::cout << "body=" << res.body() << "\n";
#endif
// std::string s = boost::beast::buffers_to_string(res.body().data());
std::string s = res.body().data();
// std::cout << "s=" << s << "\n";
// nlohmann::json j2 = nlohmann::json::parse(res.begin(), res.end());
nlohmann::json j = nlohmann::json::parse(s);
if (j["success"] != true) {
auto err_json = j.dump();
std::cout << s << "\n";
std::cout << err_json << "\n";
throw TransactionFailedException();
}
if ( j["data"] == nullptr) {
throw TransactionFailedException("No data");
}
std::cout << j.dump() << "\n";
#if 0
for (auto const& node : j["data"]) {
std::cout << node.dump() << "\n";
// std::cout << node[1] << "\n";
}
#endif
// Gracefully close the socket
beast::error_code ec;
stream.socket().shutdown(tcp::socket::shutdown_both, ec);
// not_connected happens sometimes
// so don't bother reporting it.
//
if(ec && ec != beast::errc::not_connected)
throw beast::system_error{ec};
// If we get here then the connection is closed gracefully
}
catch(std::exception const& e)
{
std::cerr << "Error: " << e.what() << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
//]