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pop3.cpp
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pop3.cpp
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/*
pop3.cpp
--------
Copyright (C) 2016, Tomislav Karastojkovic (http://www.alepho.com).
Distributed under the FreeBSD license, see the accompanying file LICENSE or
copy at http://www.freebsd.org/copyright/freebsd-license.html.
*/
#include <string>
#include <vector>
#include <map>
#include <stdexcept>
#include <utility>
#include <algorithm>
#include <chrono>
#include <boost/algorithm/string/trim.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <mailio/pop3.hpp>
using std::istream;
using std::string;
using std::to_string;
using std::vector;
using std::map;
using std::runtime_error;
using std::out_of_range;
using std::invalid_argument;
using std::stoi;
using std::stol;
using std::pair;
using std::make_pair;
using std::tuple;
using std::make_tuple;
using std::move;
using std::make_shared;
using std::chrono::milliseconds;
using boost::algorithm::trim;
using boost::iequals;
namespace mailio
{
pop3::pop3(const string& hostname, unsigned port, milliseconds timeout) :
dlg_(make_shared<dialog>(hostname, port, timeout))
{
}
pop3::~pop3()
{
try
{
dlg_->send("QUIT");
}
catch (...)
{
}
}
string pop3::authenticate(const string& username, const string& password, auth_method_t method)
{
string greeting = connect();
if (method == auth_method_t::LOGIN)
{
auth_login(username, password);
}
return greeting;
}
auto pop3::list(unsigned message_no) -> message_list_t
{
message_list_t results;
try
{
if (message_no > 0)
{
dlg_->send("LIST " + to_string(message_no));
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Listing message failure.");
// parse data
string::size_type pos = std::get<1>(stat_msg).find(TOKEN_SEPARATOR_CHAR);
if (pos == string::npos)
throw pop3_error("Parser failure.");
unsigned msg_id = stoi(std::get<1>(stat_msg).substr(0, pos));
unsigned long msg_size = stol(std::get<1>(stat_msg).substr(pos + 1));
results[msg_id] = msg_size;
}
else
{
dlg_->send("LIST");
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Listing all messages failure.");
// parse data
bool end_of_msg = false;
while (!end_of_msg)
{
line = dlg_->receive();
if (line == codec::END_OF_MESSAGE)
end_of_msg = true;
else
{
string::size_type pos = line.find(TOKEN_SEPARATOR_CHAR);
if (pos == string::npos)
throw pop3_error("Parser failure.");
unsigned msg_id = stoi(line.substr(0, pos));
unsigned long msg_size = stol(line.substr(pos + 1));
results[msg_id] = msg_size;
}
}
}
}
catch (out_of_range&)
{
throw pop3_error("Parser failure.");
}
catch (invalid_argument&)
{
throw pop3_error("Parser failure.");
}
return results;
}
auto pop3::uidl(unsigned message_no) -> uidl_list_t
{
uidl_list_t results;
try
{
if (message_no > 0)
{
dlg_->send("UIDL " + to_string(message_no));
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("UIDL command not supported.");
// parse data
string::size_type pos = std::get<1>(stat_msg).find(TOKEN_SEPARATOR_CHAR);
if (pos == string::npos)
throw pop3_error("Parser failure: " + std::get<1>(stat_msg));
unsigned msg_id = stoi(std::get<1>(stat_msg).substr(0, pos));
auto msg_uid = std::get<1>(stat_msg).substr(pos + 1);
results[msg_id] = msg_uid;
}
else
{
dlg_->send("UIDL");
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Listing all messages failure.");
// parse data
bool end_of_msg = false;
while (!end_of_msg)
{
line = dlg_->receive();
if (line == codec::END_OF_MESSAGE)
end_of_msg = true;
else
{
string::size_type pos = line.find(TOKEN_SEPARATOR_CHAR);
if (pos == string::npos)
throw pop3_error("Parser failure: " + line);
unsigned msg_id = stoi(line.substr(0, pos));
auto msg_uid = line.substr(pos + 1);
results[msg_id] = msg_uid;
}
}
}
}
catch (out_of_range& ex)
{
throw pop3_error("Parser failure: " + std::string(ex.what()));
}
catch (invalid_argument& ex)
{
throw pop3_error("Parser failure: " + std::string(ex.what()));
}
return results;
}
auto pop3::statistics() -> mailbox_stat_t
{
dlg_->send("STAT");
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Reading statistics failure.");
// parse data
string::size_type pos = std::get<1>(stat_msg).find(TOKEN_SEPARATOR_CHAR);
if (pos == string::npos)
throw pop3_error("Parser failure.");
mailbox_stat_t mailbox_stat;
try
{
mailbox_stat.messages_no = stoul(std::get<1>(stat_msg).substr(0, pos));
mailbox_stat.mailbox_size = stoul(std::get<1>(stat_msg).substr(pos + 1));
}
catch (out_of_range&)
{
throw pop3_error("Parser failure.");
}
catch (invalid_argument&)
{
throw pop3_error("Parser failure.");
}
return mailbox_stat;
}
void pop3::fetch(unsigned long message_no, message& msg, bool header_only)
{
string line;
if (header_only)
{
dlg_->send("TOP " + to_string(message_no) + " 0");
line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
return;
}
else
{
dlg_->send("RETR " + to_string(message_no));
line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Fetching message failure.");
}
// end of message is marked with crlf+dot+crlf sequence
// empty_line marks the last empty line, so it could be used to detect end of message when dot is reached
bool empty_line = false;
while (true)
{
line = dlg_->receive();
// reading line by line ensures that crlf are the last characters read; so, reaching single dot in the line means that it's end of message
if (line == codec::END_OF_MESSAGE)
{
// if header only, then mark the header end with the empty line
if (header_only)
msg.parse_by_line("");
msg.parse_by_line(codec::END_OF_LINE);
break;
}
else if (line.empty())
{
// ensure that sequence of empty lines are all included in the message; otherwise, mark that an empty line is reached
if (empty_line)
msg.parse_by_line("");
else
empty_line = true;
}
else
{
// regular line with the content; if empty line was before this one, ensure that it is included
if (empty_line)
msg.parse_by_line("");
msg.parse_by_line(line, true);
empty_line = false;
}
}
}
void pop3::remove(unsigned long message_no)
{
dlg_->send("DELE " + to_string(message_no));
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Removing message failure.");
}
string pop3::connect()
{
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Connection to server failure.");
return std::get<1>(stat_msg);
}
void pop3::auth_login(const string& username, const string& password)
{
{
dlg_->send("USER " + username);
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Username rejection.");
}
{
dlg_->send("PASS " + password);
string line = dlg_->receive();
tuple<string, string> stat_msg = parse_status(line);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Password rejection.");
}
}
tuple<string, string> pop3::parse_status(const string& line)
{
string::size_type pos = line.find(TOKEN_SEPARATOR_CHAR);
string status = line.substr(0, pos);
if (!iequals(status, "+OK") && !iequals(status, "-ERR"))
throw pop3_error("Response status unknown.");
string message;
if (pos != string::npos)
message = line.substr(pos + 1);
return make_tuple(status, message);
}
pop3s::pop3s(const string& hostname, unsigned port, milliseconds timeout) : pop3(hostname, port, timeout)
{
}
string pop3s::authenticate(const string& username, const string& password, auth_method_t method)
{
string greeting;
if (method == auth_method_t::LOGIN)
{
switch_to_ssl();
greeting = connect();
auth_login(username, password);
}
if (method == auth_method_t::START_TLS)
{
greeting = connect();
start_tls();
auth_login(username, password);
}
return greeting;
}
/*
For details see [rfc 2595/4616].
*/
void pop3s::start_tls()
{
dlg_->send("STLS");
string response = dlg_->receive();
tuple<string, string> stat_msg = parse_status(response);
if (iequals(std::get<0>(stat_msg), "-ERR"))
throw pop3_error("Start TLS failure.");
switch_to_ssl();
}
void pop3s::switch_to_ssl()
{
dlg_ = make_shared<dialog_ssl>(*dlg_);
}
} // namespace mailio