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214 lines (188 loc) · 6.25 KB
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/***************************************************************************
* Copyright (C) 2008-2021 by Andrzej Rybczak *
* *
* 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., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include "lastfm_service.h"
#include <boost/algorithm/string/replace.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <boost/locale/conversion.hpp>
#include <fstream>
#include "charset.h"
#include "curl_handle.h"
#include "settings.h"
#include "utility/html.h"
#include "utility/string.h"
namespace {
const char *apiUrl = "http://ws.audioscrobbler.com/2.0/?api_key=d94e5b6e26469a2d1ffae8ef20131b79&method=";
const char *msgInvalidResponse = "Invalid response";
}
namespace LastFm {
Service::Result Service::fetch()
{
Result result;
result.first = false;
std::string url = apiUrl;
url += methodName();
for (auto &arg : m_arguments)
{
url += "&";
url += arg.first;
url += "=";
url += Curl::escape(arg.second);
}
std::string data;
CURLcode code = Curl::perform(data, url);
if (code != CURLE_OK)
result.second = curl_easy_strerror(code);
else if (actionFailed(data))
result.second = msgInvalidResponse;
else
{
result = processData(data);
// if relevant part of data was not found and one of arguments
// was language, try to fetch it again without that parameter.
// otherwise just report failure.
if (!result.first && !m_arguments["lang"].empty())
{
m_arguments.erase("lang");
result = fetch();
}
}
return result;
}
bool Service::actionFailed(const std::string &data)
{
return data.find("status=\"failed\"") != std::string::npos;
}
/***********************************************************************/
bool ArtistInfo::argumentsOk()
{
return !m_arguments["artist"].empty();
}
void ArtistInfo::beautifyOutput(NC::Scrollpad &w)
{
w.setProperties(NC::Format::Bold, "\n\nSimilar artists:\n", NC::Format::NoBold, 0);
w.setProperties(NC::Format::Bold, "\n\nSimilar tags:\n", NC::Format::NoBold, 0);
w.setProperties(Config.color2, "\n * ", boost::regex::literal);
}
Service::Result ArtistInfo::processData(const std::string &data)
{
size_t a, b;
Service::Result result;
result.first = false;
boost::regex rx("<content>(.*?)</content>");
boost::smatch what;
if (boost::regex_search(data, what, rx))
{
std::string desc = what[1];
// if there is a description...
if (desc.length() > 0)
{
// ...locate the link to wiki on last.fm...
rx.assign("<link rel=\"original\" href=\"(.*?)\"");
if (boost::regex_search(data, what, rx))
{
std::string url = what[1], wiki;
// unescape &s
unescapeHtmlEntities(url);
// fill in language info since url points to english version.
const auto &lang = m_arguments["lang"];
if (!lang.empty() && lang != "en")
boost::replace_first(url, "last.fm/music/", "last.fm/" + lang + "/music/");
// ...try to get the content of it...
CURLcode code = Curl::perform(wiki, url, "", true);
if (code != CURLE_OK)
{
result.second = curl_easy_strerror(code);
return result;
}
else
{
// ...and filter it to get the whole description.
rx.assign("<div class=\"wiki\">(.*?)</div>");
if (boost::regex_search(wiki, what, rx))
desc = unescapeHtmlUtf8(what[1]);
}
}
stripHtmlTags(desc);
// Needs to be done after stripHtmlTags in case there are s there.
desc = unescapeHtmlUtf8(desc);
boost::trim(desc);
result.second += desc;
}
else
{
result.second += "No description available for this artist.";
return result;
}
}
else
{
result.second = msgInvalidResponse;
return result;
}
auto add_similars = [&result](boost::sregex_iterator &it, const boost::sregex_iterator &last) {
for (; it != last; ++it)
{
std::string value = it->str(1);
std::string url = it->str(2);
stripHtmlTags(value);
stripHtmlTags(url);
result.second += "\n * ";
result.second += value;
result.second += " (";
result.second += url;
result.second += ")";
}
};
a = data.find("<similar>");
b = data.find("</similar>");
if (a != std::string::npos && b != std::string::npos)
{
rx.assign("<artist>.*?<name>(.*?)</name>.*?<url>(.*?)</url>.*?</artist>");
auto it = boost::sregex_iterator(data.begin()+a, data.begin()+b, rx);
auto last = boost::sregex_iterator();
if (it != last)
result.second += "\n\nSimilar artists:\n";
add_similars(it, last);
}
a = data.find("<tags>");
b = data.find("</tags>");
if (a != std::string::npos && b != std::string::npos)
{
rx.assign("<tag>.*?<name>(.*?)</name>.*?<url>(.*?)</url>.*?</tag>");
auto it = boost::sregex_iterator(data.begin()+a, data.begin()+b, rx);
auto last = boost::sregex_iterator();
if (it != last)
result.second += "\n\nSimilar tags:\n";
add_similars(it, last);
}
// get artist we look for, it's the one before similar artists
rx.assign("<name>.*?</name>.*?<url>(.*?)</url>.*?<similar>");
if (boost::regex_search(data, what, rx))
{
std::string url = what[1];
stripHtmlTags(url);
result.second += "\n\n";
// add only url
result.second += url;
}
result.first = true;
return result;
}
}