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/*
Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string>
#include <boost/function.hpp>
#include <boost/optional.hpp>
#include <boost/filesystem.hpp>
#include <boost/algorithm/string.hpp>
#include <curl/curl.h>
#include <zip.h>
#include "scoped_temporary.h"
#include "compose.hpp"
#include "safe_stringstream.h"
#include "i18n.h"
using std::string;
using std::list;
using boost::optional;
using boost::function;
using boost::algorithm::trim;
static size_t
get_from_zip_url_data (void* buffer, size_t size, size_t nmemb, void* stream)
{
FILE* f = reinterpret_cast<FILE*> (stream);
return fwrite (buffer, size, nmemb, f);
}
/** @param url URL of ZIP file.
* @param file Filename within ZIP file.
* @param load Function passed a (temporary) filesystem path of the unpacked file.
*/
optional<string>
get_from_zip_url (string url, string file, function<void (boost::filesystem::path)> load)
{
/* Download the ZIP file to temp_zip */
CURL* curl = curl_easy_init ();
curl_easy_setopt (curl, CURLOPT_URL, url.c_str ());
ScopedTemporary temp_zip;
FILE* f = temp_zip.open ("wb");
curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, get_from_zip_url_data);
curl_easy_setopt (curl, CURLOPT_WRITEDATA, f);
curl_easy_setopt (curl, CURLOPT_FTP_USE_EPSV, 0);
/* Maximum time is 20s */
curl_easy_setopt (curl, CURLOPT_TIMEOUT, 20);
CURLcode const cr = curl_easy_perform (curl);
temp_zip.close ();
curl_easy_cleanup (curl);
if (cr != CURLE_OK) {
return String::compose (_("Download failed (%1/%2 error %3)"), url, file, cr);
}
/* Open the ZIP file and read `file' out of it */
struct zip* zip = zip_open (temp_zip.c_str(), 0, 0);
if (!zip) {
return optional<string> (_("Could not open downloaded ZIP file"));
}
struct zip_file* zip_file = zip_fopen (zip, file.c_str(), 0);
if (!zip_file) {
return optional<string> (_("Unexpected ZIP file contents"));
}
ScopedTemporary temp_cert;
f = temp_cert.open ("wb");
char buffer[4096];
while (true) {
int const N = zip_fread (zip_file, buffer, sizeof (buffer));
fwrite (buffer, 1, N, f);
if (N < int (sizeof (buffer))) {
break;
}
}
temp_cert.close ();
load (temp_cert.file ());
return optional<string> ();
}
static size_t
ftp_ls_data (void* buffer, size_t size, size_t nmemb, void* data)
{
string* s = reinterpret_cast<string *> (data);
uint8_t* b = reinterpret_cast<uint8_t *> (buffer);
for (size_t i = 0; i < (size * nmemb); ++i) {
*s += b[i];
}
return nmemb;
}
list<string>
ftp_ls (string url)
{
CURL* curl = curl_easy_init ();
if (!curl) {
return list<string> ();
}
if (url.substr (url.length() - 1, 1) != "/") {
url += "/";
}
curl_easy_setopt (curl, CURLOPT_URL, url.c_str ());
/* 20s timeout */
curl_easy_setopt (curl, CURLOPT_TIMEOUT, 20);
string ls_raw;
struct curl_slist* commands = 0;
commands = curl_slist_append (commands, "NLST");
curl_easy_setopt (curl, CURLOPT_POSTQUOTE, commands);
curl_easy_setopt (curl, CURLOPT_WRITEDATA, &ls_raw);
curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, ftp_ls_data);
curl_easy_setopt (curl, CURLOPT_FTP_USE_EPSV, 0);
CURLcode const r = curl_easy_perform (curl);
if (r != CURLE_OK) {
return list<string> ();
}
SafeStringStream s (ls_raw);
list<string> ls;
while (s.good ()) {
string line = s.getline ();
trim (line);
if (line.length() > 55) {
string const file = line.substr (55);
if (file != "." && file != "..") {
ls.push_back (file);
}
}
}
curl_easy_cleanup (curl);
return ls;
}
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