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/*
** Copyright 2025 Double Precision, Inc.
** See COPYING for distribution information.
**
*/
#include "rfc2045/rfc2045.h"
#include <idn2.h>
static std::string_view dsnaddr(std::string &addr)
{
auto e=addr.end();
auto b=std::find_if(addr.begin(), e,
[](unsigned char c) { return !isspace(c); });
auto sep=std::find(b, e, ';');
if (sep != e) ++sep;
rfc2045::entity::tolowercase(b, sep);
std::string_view format{&*b, static_cast<size_t>(sep-b)};
while (sep != e && isspace((unsigned char)*sep))
++sep;
while (sep != e && isspace((unsigned char)e[-1]))
--e;
if (format == "utf-8;")
{
size_t ntrim=sep-addr.begin();
addr.resize(e-addr.begin());
addr.erase(0, ntrim);
bool conv_error{false};
addr=unicode::iconvert::convert(
addr,
unicode::utf_8,
rfc2045_getdefaultcharset(),
conv_error
);
return addr;
}
if (format != "rfc822;")
{
return {};
}
size_t ntrim=sep-addr.begin();
addr.resize(e-addr.begin());
addr.erase(0, ntrim);
size_t p=addr.rfind('@');
if (p < addr.size())
{
char *utf8;
++p;
if (idn2_to_unicode_8z8z(addr.c_str()+p, &utf8, 0) !=
IDNA_SUCCESS)
{
utf8=0;
}
if (utf8)
{
std::string s{utf8};
free(utf8);
bool conv_error{false};
s=unicode::iconvert::convert(
s,
unicode::utf_8,
rfc2045_getdefaultcharset(),
conv_error
);
if (!conv_error)
addr.replace(p, addr.size()-p, s);
}
}
return {addr.data(), addr.size()};
}
static void print_dsn_recip(std::string origrecip,
std::string finalrecip,
std::string action,
const rfc2045::entity::dsn_callback_t &cb)
{
rfc2045::entity::tolowercase(action);
auto ab=action.begin(), ae=action.end();
while (ab != ae && isspace((unsigned char)*ab))
++ab;
while (ab != ae && isspace((unsigned char)ae[-1]))
++ae;
if (ab == ae)
return;
cb({
{&*ab, static_cast<size_t>(ae-ab)},
dsnaddr(origrecip),
dsnaddr(finalrecip)
});
}
rfc2045::entity::dsn_handler::dsn_handler(const dsn_callback_t &callback)
: callback{callback}
{
// Truncate each line to 1024 characters
linebuf.reserve(1024);
}
const rfc2045::entity *rfc2045::entity::dsn_handler::report(
const rfc2045::entity &entity
)
{
std::string report_type_value;
if (auto report_type=entity.content_type.parameters.find(
"report-type"
); report_type != entity.content_type.parameters.end())
{
report_type_value=report_type->second.value;
tolowercase(report_type_value);
}
auto delivery_status=std::find_if(
entity.subentities.begin(),
entity.subentities.end(),
[]
(auto &se)
{
return rfc2045_delivery_status_content_type(
se.content_type.value.c_str()
);
});
if (entity.content_type.value != "multipart/report" ||
report_type_value != "delivery-status" ||
delivery_status == entity.subentities.end())
return nullptr;;
return &*delivery_status;
}
void rfc2045::entity::dsn_handler::operator()(const char *p, size_t n)
{
while (n)
{
auto q=p;
p=std::find(p, p+n, '\n');
n -= p-q;
size_t c=p-q;
if (c+linebuf.size() > 1024)
c=1024-linebuf.size();
linebuf.insert(linebuf.end(), q, q+c);
if (n && *p == '\n')
{
++p;
--n;
if (linebuf.empty() ||
isspace(linebuf[0]))
{
finish();
origreceip.clear();
finalreceip.clear();
action.clear();
}
size_t colon=linebuf.find(':');
if (colon > linebuf.size())
colon=linebuf.size();
auto vb=linebuf.begin()+colon;
tolowercase(linebuf.begin(), vb);
std::string_view word{
linebuf.data(),
static_cast<size_t>(vb-linebuf.begin())
};
auto ve=linebuf.end();
if (vb < ve) ++vb;
while (vb < ve && isspace(*vb))
++vb;
while (vb < ve && isspace(ve[-1]))
--ve;
if (word == "action")
action=std::string{vb, ve};
if (word == "final-recipient")
finalreceip=std::string{vb, ve};
if (word == "original-recipient")
origreceip=std::string{vb, ve};
linebuf.clear();
}
}
}
void rfc2045::entity::dsn_handler::finish()
{
print_dsn_recip(
std::move(origreceip),
std::move(finalreceip),
std::move(action),
callback
);
}
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