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/* This file is part of mastodonpp.
* Copyright © 2020 tastytea <tastytea@tastytea.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "instance.hpp"
#include "log.hpp"
#include <algorithm>
#include <exception>
#include <regex>
namespace mastodonpp
{
using std::sort;
using std::stoull;
using std::exception;
using std::regex;
using std::regex_search;
using std::smatch;
uint64_t Instance::get_max_chars() noexcept
{
constexpr uint64_t default_max_chars{500};
if (_max_chars != 0)
{
return _max_chars;
}
try
{
debuglog << "Querying " << _hostname << " for max_toot_chars…\n";
const auto answer{make_request(http_method::GET,
_baseuri + "/api/v1/instance", {})};
if (!answer)
{
debuglog << "Could not get instance info.\n";
return default_max_chars;
}
_max_chars = [&answer]
{
auto &body{answer.body};
size_t pos_start{body.find("max_toot_chars")};
if (pos_start == string::npos)
{
debuglog << "max_toot_chars not found.\n";
return default_max_chars;
}
pos_start = body.find(':', pos_start) + 1;
const size_t pos_end{body.find(',', pos_start)};
const auto max_toot_chars{body.substr(pos_start,
pos_end - pos_start)};
return static_cast<uint64_t>(stoull(max_toot_chars));
}();
debuglog << "Set _max_chars to: " << _max_chars << '\n';
}
catch (const exception &e)
{
debuglog << "Unexpected exception: " << e.what() << '\n';
return default_max_chars;
}
return _max_chars;
}
answer_type Instance::get_nodeinfo()
{
debuglog << "Finding location of NodeInfo on " << _hostname << "…\n";
auto answer{make_request(http_method::GET,
_baseuri + "/.well-known/nodeinfo", {})};
if (!answer)
{
debuglog << "NodeInfo not found.\n";
return answer;
}
size_t pos{0};
vector<string> hrefs;
constexpr string_view searchstring{R"("href":")"};
while ((pos = answer.body.find(searchstring, pos)) != string::npos)
{
pos += searchstring.size();
auto endpos{answer.body.find('"', pos)};
hrefs.push_back(answer.body.substr(pos, endpos - pos));
debuglog << "Found href: " << hrefs.back() << '\n';
}
sort(hrefs.begin(), hrefs.end()); // We assume they are sortable strings.
debuglog << "Selecting href: " << hrefs.back() << '\n';
return make_request(http_method::GET, hrefs.back(), {});
}
vector<string> Instance::get_post_formats() noexcept
{
constexpr auto default_value{"text/plain"};
if (!_post_formats.empty())
{
return _post_formats;
}
try
{
debuglog << "Querying " << _hostname << " for postFormats…\n";
const auto answer{get_nodeinfo()};
if (!answer)
{
debuglog << "Couldn't get NodeInfo.\n";
_post_formats = {default_value};
return _post_formats;
}
constexpr string_view searchstring{R"("postFormats":[)"};
auto pos{answer.body.find(searchstring)};
if (pos == string::npos)
{
debuglog << "Couldn't find metadata.postFormats.\n";
_post_formats = {default_value};
return _post_formats;
}
pos += searchstring.size();
auto endpos{answer.body.find("],", pos)};
string formats{answer.body.substr(pos, endpos - pos)};
debuglog << "Extracted postFormats: " << formats << '\n';
while ((pos = formats.find('"', 1)) != string::npos)
{
_post_formats.push_back(formats.substr(1, pos - 1));
formats.erase(0, pos + 2); // 2 is the length of: ",
debuglog << "Found postFormat: " << _post_formats.back() << '\n';
}
}
catch (const std::exception &e)
{
debuglog << "Unexpected exception: " << e.what() << '\n';
return {default_value};
}
return _post_formats;
}
answer_type Instance::ObtainToken::step_1(const string_view client_name,
const string_view scopes,
const string_view website)
{
parametermap parameters
{
{"client_name", client_name},
{"redirect_uris", "urn:ietf:wg:oauth:2.0:oob"}
};
if (!scopes.empty())
{
_scopes = scopes;
parameters.insert({"scopes", scopes});
}
if (!website.empty())
{
parameters.insert({"website", website});
}
auto answer{make_request(http_method::POST, _baseuri + "/api/v1/apps",
parameters)};
if (answer)
{
const regex re_id{R"("client_id"\s*:\s*"([^"]+)\")"};
const regex re_secret{R"("client_secret"\s*:\s*"([^"]+)\")"};
smatch match;
if (regex_search(answer.body, match, re_id))
{
_client_id = match[1].str();
}
if (regex_search(answer.body, match, re_secret))
{
_client_secret = match[1].str();
}
string uri{_baseuri + "/oauth/authorize?scope=" + escape_url(scopes)
+ "&response_type=code"
"&redirect_uri=" + escape_url("urn:ietf:wg:oauth:2.0:oob")
+ "&client_id=" + _client_id};
if (!website.empty())
{
uri += "&website=" + escape_url(website);
}
answer.body = uri;
debuglog << "Built URI.";
}
return answer;
}
answer_type Instance::ObtainToken::step_2(const string_view code)
{
parametermap parameters
{
{"client_id", _client_id},
{"client_secret", _client_secret},
{"redirect_uri", "urn:ietf:wg:oauth:2.0:oob"},
{"code", code},
{"grant_type", "client_credentials"}
};
if (!_scopes.empty())
{
parameters.insert({"scope", _scopes});
}
auto answer{make_request(http_method::POST, _baseuri + "/oauth/token",
parameters)};
if (answer)
{
const regex re_token{R"("access_token"\s*:\s*"([^"]+)\")"};
smatch match;
if (regex_search(answer.body, match, re_token))
{
answer.body = match[1].str();
debuglog << "Got access token.\n";
_instance.set_access_token(answer.body);
}
}
return answer;
}
} // namespace mastodonpp
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